refact(deps): bump k8s and client-go deps to version v0.20.2 (#294)

Signed-off-by: prateekpandey14 <prateek.pandey@mayadata.io>

vendor/golang.org/x/tools/internal/event/core/event.go

@@ -0,0 +1,85 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package core provides support for event based telemetry.
+package core
+
+import (
+	"fmt"
+	"time"
+
+	"golang.org/x/tools/internal/event/label"
+)
+
+// Event holds the information about an event of note that ocurred.
+type Event struct {
+	at time.Time
+
+	// As events are often on the stack, storing the first few labels directly
+	// in the event can avoid an allocation at all for the very common cases of
+	// simple events.
+	// The length needs to be large enough to cope with the majority of events
+	// but no so large as to cause undue stack pressure.
+	// A log message with two values will use 3 labels (one for each value and
+	// one for the message itself).
+
+	static  [3]label.Label // inline storage for the first few labels
+	dynamic []label.Label  // dynamically sized storage for remaining labels
+}
+
+// eventLabelMap implements label.Map for a the labels of an Event.
+type eventLabelMap struct {
+	event Event
+}
+
+func (ev Event) At() time.Time { return ev.at }
+
+func (ev Event) Format(f fmt.State, r rune) {
+	if !ev.at.IsZero() {
+		fmt.Fprint(f, ev.at.Format("2006/01/02 15:04:05 "))
+	}
+	for index := 0; ev.Valid(index); index++ {
+		if l := ev.Label(index); l.Valid() {
+			fmt.Fprintf(f, "\n\t%v", l)
+		}
+	}
+}
+
+func (ev Event) Valid(index int) bool {
+	return index >= 0 && index < len(ev.static)+len(ev.dynamic)
+}
+
+func (ev Event) Label(index int) label.Label {
+	if index < len(ev.static) {
+		return ev.static[index]
+	}
+	return ev.dynamic[index-len(ev.static)]
+}
+
+func (ev Event) Find(key label.Key) label.Label {
+	for _, l := range ev.static {
+		if l.Key() == key {
+			return l
+		}
+	}
+	for _, l := range ev.dynamic {
+		if l.Key() == key {
+			return l
+		}
+	}
+	return label.Label{}
+}
+
+func MakeEvent(static [3]label.Label, labels []label.Label) Event {
+	return Event{
+		static:  static,
+		dynamic: labels,
+	}
+}
+
+// CloneEvent event returns a copy of the event with the time adjusted to at.
+func CloneEvent(ev Event, at time.Time) Event {
+	ev.at = at
+	return ev
+}

vendor/golang.org/x/tools/internal/event/core/export.go

@@ -0,0 +1,70 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package core
+
+import (
+	"context"
+	"sync/atomic"
+	"time"
+	"unsafe"
+
+	"golang.org/x/tools/internal/event/label"
+)
+
+// Exporter is a function that handles events.
+// It may return a modified context and event.
+type Exporter func(context.Context, Event, label.Map) context.Context
+
+var (
+	exporter unsafe.Pointer
+)
+
+// SetExporter sets the global exporter function that handles all events.
+// The exporter is called synchronously from the event call site, so it should
+// return quickly so as not to hold up user code.
+func SetExporter(e Exporter) {
+	p := unsafe.Pointer(&e)
+	if e == nil {
+		// &e is always valid, and so p is always valid, but for the early abort
+		// of ProcessEvent to be efficient it needs to make the nil check on the
+		// pointer without having to dereference it, so we make the nil function
+		// also a nil pointer
+		p = nil
+	}
+	atomic.StorePointer(&exporter, p)
+}
+
+// deliver is called to deliver an event to the supplied exporter.
+// it will fill in the time.
+func deliver(ctx context.Context, exporter Exporter, ev Event) context.Context {
+	// add the current time to the event
+	ev.at = time.Now()
+	// hand the event off to the current exporter
+	return exporter(ctx, ev, ev)
+}
+
+// Export is called to deliver an event to the global exporter if set.
+func Export(ctx context.Context, ev Event) context.Context {
+	// get the global exporter and abort early if there is not one
+	exporterPtr := (*Exporter)(atomic.LoadPointer(&exporter))
+	if exporterPtr == nil {
+		return ctx
+	}
+	return deliver(ctx, *exporterPtr, ev)
+}
+
+// ExportPair is called to deliver a start event to the supplied exporter.
+// It also returns a function that will deliver the end event to the same
+// exporter.
+// It will fill in the time.
+func ExportPair(ctx context.Context, begin, end Event) (context.Context, func()) {
+	// get the global exporter and abort early if there is not one
+	exporterPtr := (*Exporter)(atomic.LoadPointer(&exporter))
+	if exporterPtr == nil {
+		return ctx, func() {}
+	}
+	ctx = deliver(ctx, *exporterPtr, begin)
+	return ctx, func() { deliver(ctx, *exporterPtr, end) }
+}

vendor/golang.org/x/tools/internal/event/core/fast.go

@@ -0,0 +1,77 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package core
+
+import (
+	"context"
+
+	"golang.org/x/tools/internal/event/keys"
+	"golang.org/x/tools/internal/event/label"
+)
+
+// Log1 takes a message and one label delivers a log event to the exporter.
+// It is a customized version of Print that is faster and does no allocation.
+func Log1(ctx context.Context, message string, t1 label.Label) {
+	Export(ctx, MakeEvent([3]label.Label{
+		keys.Msg.Of(message),
+		t1,
+	}, nil))
+}
+
+// Log2 takes a message and two labels and delivers a log event to the exporter.
+// It is a customized version of Print that is faster and does no allocation.
+func Log2(ctx context.Context, message string, t1 label.Label, t2 label.Label) {
+	Export(ctx, MakeEvent([3]label.Label{
+		keys.Msg.Of(message),
+		t1,
+		t2,
+	}, nil))
+}
+
+// Metric1 sends a label event to the exporter with the supplied labels.
+func Metric1(ctx context.Context, t1 label.Label) context.Context {
+	return Export(ctx, MakeEvent([3]label.Label{
+		keys.Metric.New(),
+		t1,
+	}, nil))
+}
+
+// Metric2 sends a label event to the exporter with the supplied labels.
+func Metric2(ctx context.Context, t1, t2 label.Label) context.Context {
+	return Export(ctx, MakeEvent([3]label.Label{
+		keys.Metric.New(),
+		t1,
+		t2,
+	}, nil))
+}
+
+// Start1 sends a span start event with the supplied label list to the exporter.
+// It also returns a function that will end the span, which should normally be
+// deferred.
+func Start1(ctx context.Context, name string, t1 label.Label) (context.Context, func()) {
+	return ExportPair(ctx,
+		MakeEvent([3]label.Label{
+			keys.Start.Of(name),
+			t1,
+		}, nil),
+		MakeEvent([3]label.Label{
+			keys.End.New(),
+		}, nil))
+}
+
+// Start2 sends a span start event with the supplied label list to the exporter.
+// It also returns a function that will end the span, which should normally be
+// deferred.
+func Start2(ctx context.Context, name string, t1, t2 label.Label) (context.Context, func()) {
+	return ExportPair(ctx,
+		MakeEvent([3]label.Label{
+			keys.Start.Of(name),
+			t1,
+			t2,
+		}, nil),
+		MakeEvent([3]label.Label{
+			keys.End.New(),
+		}, nil))
+}

vendor/golang.org/x/tools/internal/event/doc.go

@@ -0,0 +1,7 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package event provides a set of packages that cover the main
+// concepts of telemetry in an implementation agnostic way.
+package event

vendor/golang.org/x/tools/internal/event/event.go

@@ -0,0 +1,127 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package event
+
+import (
+	"context"
+
+	"golang.org/x/tools/internal/event/core"
+	"golang.org/x/tools/internal/event/keys"
+	"golang.org/x/tools/internal/event/label"
+)
+
+// Exporter is a function that handles events.
+// It may return a modified context and event.
+type Exporter func(context.Context, core.Event, label.Map) context.Context
+
+// SetExporter sets the global exporter function that handles all events.
+// The exporter is called synchronously from the event call site, so it should
+// return quickly so as not to hold up user code.
+func SetExporter(e Exporter) {
+	core.SetExporter(core.Exporter(e))
+}
+
+// Log takes a message and a label list and combines them into a single event
+// before delivering them to the exporter.
+func Log(ctx context.Context, message string, labels ...label.Label) {
+	core.Export(ctx, core.MakeEvent([3]label.Label{
+		keys.Msg.Of(message),
+	}, labels))
+}
+
+// IsLog returns true if the event was built by the Log function.
+// It is intended to be used in exporters to identify the semantics of the
+// event when deciding what to do with it.
+func IsLog(ev core.Event) bool {
+	return ev.Label(0).Key() == keys.Msg
+}
+
+// Error takes a message and a label list and combines them into a single event
+// before delivering them to the exporter. It captures the error in the
+// delivered event.
+func Error(ctx context.Context, message string, err error, labels ...label.Label) {
+	core.Export(ctx, core.MakeEvent([3]label.Label{
+		keys.Msg.Of(message),
+		keys.Err.Of(err),
+	}, labels))
+}
+
+// IsError returns true if the event was built by the Error function.
+// It is intended to be used in exporters to identify the semantics of the
+// event when deciding what to do with it.
+func IsError(ev core.Event) bool {
+	return ev.Label(0).Key() == keys.Msg &&
+		ev.Label(1).Key() == keys.Err
+}
+
+// Metric sends a label event to the exporter with the supplied labels.
+func Metric(ctx context.Context, labels ...label.Label) {
+	core.Export(ctx, core.MakeEvent([3]label.Label{
+		keys.Metric.New(),
+	}, labels))
+}
+
+// IsMetric returns true if the event was built by the Metric function.
+// It is intended to be used in exporters to identify the semantics of the
+// event when deciding what to do with it.
+func IsMetric(ev core.Event) bool {
+	return ev.Label(0).Key() == keys.Metric
+}
+
+// Label sends a label event to the exporter with the supplied labels.
+func Label(ctx context.Context, labels ...label.Label) context.Context {
+	return core.Export(ctx, core.MakeEvent([3]label.Label{
+		keys.Label.New(),
+	}, labels))
+}
+
+// IsLabel returns true if the event was built by the Label function.
+// It is intended to be used in exporters to identify the semantics of the
+// event when deciding what to do with it.
+func IsLabel(ev core.Event) bool {
+	return ev.Label(0).Key() == keys.Label
+}
+
+// Start sends a span start event with the supplied label list to the exporter.
+// It also returns a function that will end the span, which should normally be
+// deferred.
+func Start(ctx context.Context, name string, labels ...label.Label) (context.Context, func()) {
+	return core.ExportPair(ctx,
+		core.MakeEvent([3]label.Label{
+			keys.Start.Of(name),
+		}, labels),
+		core.MakeEvent([3]label.Label{
+			keys.End.New(),
+		}, nil))
+}
+
+// IsStart returns true if the event was built by the Start function.
+// It is intended to be used in exporters to identify the semantics of the
+// event when deciding what to do with it.
+func IsStart(ev core.Event) bool {
+	return ev.Label(0).Key() == keys.Start
+}
+
+// IsEnd returns true if the event was built by the End function.
+// It is intended to be used in exporters to identify the semantics of the
+// event when deciding what to do with it.
+func IsEnd(ev core.Event) bool {
+	return ev.Label(0).Key() == keys.End
+}
+
+// Detach returns a context without an associated span.
+// This allows the creation of spans that are not children of the current span.
+func Detach(ctx context.Context) context.Context {
+	return core.Export(ctx, core.MakeEvent([3]label.Label{
+		keys.Detach.New(),
+	}, nil))
+}
+
+// IsDetach returns true if the event was built by the Detach function.
+// It is intended to be used in exporters to identify the semantics of the
+// event when deciding what to do with it.
+func IsDetach(ev core.Event) bool {
+	return ev.Label(0).Key() == keys.Detach
+}

vendor/golang.org/x/tools/internal/event/keys/keys.go

@@ -0,0 +1,564 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package keys
+
+import (
+	"fmt"
+	"io"
+	"math"
+	"strconv"
+
+	"golang.org/x/tools/internal/event/label"
+)
+
+// Value represents a key for untyped values.
+type Value struct {
+	name        string
+	description string
+}
+
+// New creates a new Key for untyped values.
+func New(name, description string) *Value {
+	return &Value{name: name, description: description}
+}
+
+func (k *Value) Name() string        { return k.name }
+func (k *Value) Description() string { return k.description }
+
+func (k *Value) Format(w io.Writer, buf []byte, l label.Label) {
+	fmt.Fprint(w, k.From(l))
+}
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Value) Get(lm label.Map) interface{} {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return nil
+}
+
+// From can be used to get a value from a Label.
+func (k *Value) From(t label.Label) interface{} { return t.UnpackValue() }
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Value) Of(value interface{}) label.Label { return label.OfValue(k, value) }
+
+// Tag represents a key for tagging labels that have no value.
+// These are used when the existence of the label is the entire information it
+// carries, such as marking events to be of a specific kind, or from a specific
+// package.
+type Tag struct {
+	name        string
+	description string
+}
+
+// NewTag creates a new Key for tagging labels.
+func NewTag(name, description string) *Tag {
+	return &Tag{name: name, description: description}
+}
+
+func (k *Tag) Name() string        { return k.name }
+func (k *Tag) Description() string { return k.description }
+
+func (k *Tag) Format(w io.Writer, buf []byte, l label.Label) {}
+
+// New creates a new Label with this key.
+func (k *Tag) New() label.Label { return label.OfValue(k, nil) }
+
+// Int represents a key
+type Int struct {
+	name        string
+	description string
+}
+
+// NewInt creates a new Key for int values.
+func NewInt(name, description string) *Int {
+	return &Int{name: name, description: description}
+}
+
+func (k *Int) Name() string        { return k.name }
+func (k *Int) Description() string { return k.description }
+
+func (k *Int) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendInt(buf, int64(k.From(l)), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Int) Of(v int) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Int) Get(lm label.Map) int {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *Int) From(t label.Label) int { return int(t.Unpack64()) }
+
+// Int8 represents a key
+type Int8 struct {
+	name        string
+	description string
+}
+
+// NewInt8 creates a new Key for int8 values.
+func NewInt8(name, description string) *Int8 {
+	return &Int8{name: name, description: description}
+}
+
+func (k *Int8) Name() string        { return k.name }
+func (k *Int8) Description() string { return k.description }
+
+func (k *Int8) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendInt(buf, int64(k.From(l)), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Int8) Of(v int8) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Int8) Get(lm label.Map) int8 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *Int8) From(t label.Label) int8 { return int8(t.Unpack64()) }
+
+// Int16 represents a key
+type Int16 struct {
+	name        string
+	description string
+}
+
+// NewInt16 creates a new Key for int16 values.
+func NewInt16(name, description string) *Int16 {
+	return &Int16{name: name, description: description}
+}
+
+func (k *Int16) Name() string        { return k.name }
+func (k *Int16) Description() string { return k.description }
+
+func (k *Int16) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendInt(buf, int64(k.From(l)), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Int16) Of(v int16) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Int16) Get(lm label.Map) int16 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *Int16) From(t label.Label) int16 { return int16(t.Unpack64()) }
+
+// Int32 represents a key
+type Int32 struct {
+	name        string
+	description string
+}
+
+// NewInt32 creates a new Key for int32 values.
+func NewInt32(name, description string) *Int32 {
+	return &Int32{name: name, description: description}
+}
+
+func (k *Int32) Name() string        { return k.name }
+func (k *Int32) Description() string { return k.description }
+
+func (k *Int32) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendInt(buf, int64(k.From(l)), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Int32) Of(v int32) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Int32) Get(lm label.Map) int32 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *Int32) From(t label.Label) int32 { return int32(t.Unpack64()) }
+
+// Int64 represents a key
+type Int64 struct {
+	name        string
+	description string
+}
+
+// NewInt64 creates a new Key for int64 values.
+func NewInt64(name, description string) *Int64 {
+	return &Int64{name: name, description: description}
+}
+
+func (k *Int64) Name() string        { return k.name }
+func (k *Int64) Description() string { return k.description }
+
+func (k *Int64) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendInt(buf, k.From(l), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Int64) Of(v int64) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Int64) Get(lm label.Map) int64 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *Int64) From(t label.Label) int64 { return int64(t.Unpack64()) }
+
+// UInt represents a key
+type UInt struct {
+	name        string
+	description string
+}
+
+// NewUInt creates a new Key for uint values.
+func NewUInt(name, description string) *UInt {
+	return &UInt{name: name, description: description}
+}
+
+func (k *UInt) Name() string        { return k.name }
+func (k *UInt) Description() string { return k.description }
+
+func (k *UInt) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendUint(buf, uint64(k.From(l)), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *UInt) Of(v uint) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *UInt) Get(lm label.Map) uint {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *UInt) From(t label.Label) uint { return uint(t.Unpack64()) }
+
+// UInt8 represents a key
+type UInt8 struct {
+	name        string
+	description string
+}
+
+// NewUInt8 creates a new Key for uint8 values.
+func NewUInt8(name, description string) *UInt8 {
+	return &UInt8{name: name, description: description}
+}
+
+func (k *UInt8) Name() string        { return k.name }
+func (k *UInt8) Description() string { return k.description }
+
+func (k *UInt8) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendUint(buf, uint64(k.From(l)), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *UInt8) Of(v uint8) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *UInt8) Get(lm label.Map) uint8 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *UInt8) From(t label.Label) uint8 { return uint8(t.Unpack64()) }
+
+// UInt16 represents a key
+type UInt16 struct {
+	name        string
+	description string
+}
+
+// NewUInt16 creates a new Key for uint16 values.
+func NewUInt16(name, description string) *UInt16 {
+	return &UInt16{name: name, description: description}
+}
+
+func (k *UInt16) Name() string        { return k.name }
+func (k *UInt16) Description() string { return k.description }
+
+func (k *UInt16) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendUint(buf, uint64(k.From(l)), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *UInt16) Of(v uint16) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *UInt16) Get(lm label.Map) uint16 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *UInt16) From(t label.Label) uint16 { return uint16(t.Unpack64()) }
+
+// UInt32 represents a key
+type UInt32 struct {
+	name        string
+	description string
+}
+
+// NewUInt32 creates a new Key for uint32 values.
+func NewUInt32(name, description string) *UInt32 {
+	return &UInt32{name: name, description: description}
+}
+
+func (k *UInt32) Name() string        { return k.name }
+func (k *UInt32) Description() string { return k.description }
+
+func (k *UInt32) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendUint(buf, uint64(k.From(l)), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *UInt32) Of(v uint32) label.Label { return label.Of64(k, uint64(v)) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *UInt32) Get(lm label.Map) uint32 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *UInt32) From(t label.Label) uint32 { return uint32(t.Unpack64()) }
+
+// UInt64 represents a key
+type UInt64 struct {
+	name        string
+	description string
+}
+
+// NewUInt64 creates a new Key for uint64 values.
+func NewUInt64(name, description string) *UInt64 {
+	return &UInt64{name: name, description: description}
+}
+
+func (k *UInt64) Name() string        { return k.name }
+func (k *UInt64) Description() string { return k.description }
+
+func (k *UInt64) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendUint(buf, k.From(l), 10))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *UInt64) Of(v uint64) label.Label { return label.Of64(k, v) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *UInt64) Get(lm label.Map) uint64 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *UInt64) From(t label.Label) uint64 { return t.Unpack64() }
+
+// Float32 represents a key
+type Float32 struct {
+	name        string
+	description string
+}
+
+// NewFloat32 creates a new Key for float32 values.
+func NewFloat32(name, description string) *Float32 {
+	return &Float32{name: name, description: description}
+}
+
+func (k *Float32) Name() string        { return k.name }
+func (k *Float32) Description() string { return k.description }
+
+func (k *Float32) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendFloat(buf, float64(k.From(l)), 'E', -1, 32))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Float32) Of(v float32) label.Label {
+	return label.Of64(k, uint64(math.Float32bits(v)))
+}
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Float32) Get(lm label.Map) float32 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *Float32) From(t label.Label) float32 {
+	return math.Float32frombits(uint32(t.Unpack64()))
+}
+
+// Float64 represents a key
+type Float64 struct {
+	name        string
+	description string
+}
+
+// NewFloat64 creates a new Key for int64 values.
+func NewFloat64(name, description string) *Float64 {
+	return &Float64{name: name, description: description}
+}
+
+func (k *Float64) Name() string        { return k.name }
+func (k *Float64) Description() string { return k.description }
+
+func (k *Float64) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendFloat(buf, k.From(l), 'E', -1, 64))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Float64) Of(v float64) label.Label {
+	return label.Of64(k, math.Float64bits(v))
+}
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Float64) Get(lm label.Map) float64 {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return 0
+}
+
+// From can be used to get a value from a Label.
+func (k *Float64) From(t label.Label) float64 {
+	return math.Float64frombits(t.Unpack64())
+}
+
+// String represents a key
+type String struct {
+	name        string
+	description string
+}
+
+// NewString creates a new Key for int64 values.
+func NewString(name, description string) *String {
+	return &String{name: name, description: description}
+}
+
+func (k *String) Name() string        { return k.name }
+func (k *String) Description() string { return k.description }
+
+func (k *String) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendQuote(buf, k.From(l)))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *String) Of(v string) label.Label { return label.OfString(k, v) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *String) Get(lm label.Map) string {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return ""
+}
+
+// From can be used to get a value from a Label.
+func (k *String) From(t label.Label) string { return t.UnpackString() }
+
+// Boolean represents a key
+type Boolean struct {
+	name        string
+	description string
+}
+
+// NewBoolean creates a new Key for bool values.
+func NewBoolean(name, description string) *Boolean {
+	return &Boolean{name: name, description: description}
+}
+
+func (k *Boolean) Name() string        { return k.name }
+func (k *Boolean) Description() string { return k.description }
+
+func (k *Boolean) Format(w io.Writer, buf []byte, l label.Label) {
+	w.Write(strconv.AppendBool(buf, k.From(l)))
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Boolean) Of(v bool) label.Label {
+	if v {
+		return label.Of64(k, 1)
+	}
+	return label.Of64(k, 0)
+}
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Boolean) Get(lm label.Map) bool {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return false
+}
+
+// From can be used to get a value from a Label.
+func (k *Boolean) From(t label.Label) bool { return t.Unpack64() > 0 }
+
+// Error represents a key
+type Error struct {
+	name        string
+	description string
+}
+
+// NewError creates a new Key for int64 values.
+func NewError(name, description string) *Error {
+	return &Error{name: name, description: description}
+}
+
+func (k *Error) Name() string        { return k.name }
+func (k *Error) Description() string { return k.description }
+
+func (k *Error) Format(w io.Writer, buf []byte, l label.Label) {
+	io.WriteString(w, k.From(l).Error())
+}
+
+// Of creates a new Label with this key and the supplied value.
+func (k *Error) Of(v error) label.Label { return label.OfValue(k, v) }
+
+// Get can be used to get a label for the key from a label.Map.
+func (k *Error) Get(lm label.Map) error {
+	if t := lm.Find(k); t.Valid() {
+		return k.From(t)
+	}
+	return nil
+}
+
+// From can be used to get a value from a Label.
+func (k *Error) From(t label.Label) error {
+	err, _ := t.UnpackValue().(error)
+	return err
+}

vendor/golang.org/x/tools/internal/event/keys/standard.go

@@ -0,0 +1,22 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package keys
+
+var (
+	// Msg is a key used to add message strings to label lists.
+	Msg = NewString("message", "a readable message")
+	// Label is a key used to indicate an event adds labels to the context.
+	Label = NewTag("label", "a label context marker")
+	// Start is used for things like traces that have a name.
+	Start = NewString("start", "span start")
+	// Metric is a key used to indicate an event records metrics.
+	End = NewTag("end", "a span end marker")
+	// Metric is a key used to indicate an event records metrics.
+	Detach = NewTag("detach", "a span detach marker")
+	// Err is a key used to add error values to label lists.
+	Err = NewError("error", "an error that occurred")
+	// Metric is a key used to indicate an event records metrics.
+	Metric = NewTag("metric", "a metric event marker")
+)

vendor/golang.org/x/tools/internal/event/label/label.go

@@ -0,0 +1,213 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package label
+
+import (
+	"fmt"
+	"io"
+	"reflect"
+	"unsafe"
+)
+
+// Key is used as the identity of a Label.
+// Keys are intended to be compared by pointer only, the name should be unique
+// for communicating with external systems, but it is not required or enforced.
+type Key interface {
+	// Name returns the key name.
+	Name() string
+	// Description returns a string that can be used to describe the value.
+	Description() string
+
+	// Format is used in formatting to append the value of the label to the
+	// supplied buffer.
+	// The formatter may use the supplied buf as a scratch area to avoid
+	// allocations.
+	Format(w io.Writer, buf []byte, l Label)
+}
+
+// Label holds a key and value pair.
+// It is normally used when passing around lists of labels.
+type Label struct {
+	key     Key
+	packed  uint64
+	untyped interface{}
+}
+
+// Map is the interface to a collection of Labels indexed by key.
+type Map interface {
+	// Find returns the label that matches the supplied key.
+	Find(key Key) Label
+}
+
+// List is the interface to something that provides an iterable
+// list of labels.
+// Iteration should start from 0 and continue until Valid returns false.
+type List interface {
+	// Valid returns true if the index is within range for the list.
+	// It does not imply the label at that index will itself be valid.
+	Valid(index int) bool
+	// Label returns the label at the given index.
+	Label(index int) Label
+}
+
+// list implements LabelList for a list of Labels.
+type list struct {
+	labels []Label
+}
+
+// filter wraps a LabelList filtering out specific labels.
+type filter struct {
+	keys       []Key
+	underlying List
+}
+
+// listMap implements LabelMap for a simple list of labels.
+type listMap struct {
+	labels []Label
+}
+
+// mapChain implements LabelMap for a list of underlying LabelMap.
+type mapChain struct {
+	maps []Map
+}
+
+// OfValue creates a new label from the key and value.
+// This method is for implementing new key types, label creation should
+// normally be done with the Of method of the key.
+func OfValue(k Key, value interface{}) Label { return Label{key: k, untyped: value} }
+
+// UnpackValue assumes the label was built using LabelOfValue and returns the value
+// that was passed to that constructor.
+// This method is for implementing new key types, for type safety normal
+// access should be done with the From method of the key.
+func (t Label) UnpackValue() interface{} { return t.untyped }
+
+// Of64 creates a new label from a key and a uint64. This is often
+// used for non uint64 values that can be packed into a uint64.
+// This method is for implementing new key types, label creation should
+// normally be done with the Of method of the key.
+func Of64(k Key, v uint64) Label { return Label{key: k, packed: v} }
+
+// Unpack64 assumes the label was built using LabelOf64 and returns the value that
+// was passed to that constructor.
+// This method is for implementing new key types, for type safety normal
+// access should be done with the From method of the key.
+func (t Label) Unpack64() uint64 { return t.packed }
+
+// OfString creates a new label from a key and a string.
+// This method is for implementing new key types, label creation should
+// normally be done with the Of method of the key.
+func OfString(k Key, v string) Label {
+	hdr := (*reflect.StringHeader)(unsafe.Pointer(&v))
+	return Label{
+		key:     k,
+		packed:  uint64(hdr.Len),
+		untyped: unsafe.Pointer(hdr.Data),
+	}
+}
+
+// UnpackString assumes the label was built using LabelOfString and returns the
+// value that was passed to that constructor.
+// This method is for implementing new key types, for type safety normal
+// access should be done with the From method of the key.
+func (t Label) UnpackString() string {
+	var v string
+	hdr := (*reflect.StringHeader)(unsafe.Pointer(&v))
+	hdr.Data = uintptr(t.untyped.(unsafe.Pointer))
+	hdr.Len = int(t.packed)
+	return *(*string)(unsafe.Pointer(hdr))
+}
+
+// Valid returns true if the Label is a valid one (it has a key).
+func (t Label) Valid() bool { return t.key != nil }
+
+// Key returns the key of this Label.
+func (t Label) Key() Key { return t.key }
+
+// Format is used for debug printing of labels.
+func (t Label) Format(f fmt.State, r rune) {
+	if !t.Valid() {
+		io.WriteString(f, `nil`)
+		return
+	}
+	io.WriteString(f, t.Key().Name())
+	io.WriteString(f, "=")
+	var buf [128]byte
+	t.Key().Format(f, buf[:0], t)
+}
+
+func (l *list) Valid(index int) bool {
+	return index >= 0 && index < len(l.labels)
+}
+
+func (l *list) Label(index int) Label {
+	return l.labels[index]
+}
+
+func (f *filter) Valid(index int) bool {
+	return f.underlying.Valid(index)
+}
+
+func (f *filter) Label(index int) Label {
+	l := f.underlying.Label(index)
+	for _, f := range f.keys {
+		if l.Key() == f {
+			return Label{}
+		}
+	}
+	return l
+}
+
+func (lm listMap) Find(key Key) Label {
+	for _, l := range lm.labels {
+		if l.Key() == key {
+			return l
+		}
+	}
+	return Label{}
+}
+
+func (c mapChain) Find(key Key) Label {
+	for _, src := range c.maps {
+		l := src.Find(key)
+		if l.Valid() {
+			return l
+		}
+	}
+	return Label{}
+}
+
+var emptyList = &list{}
+
+func NewList(labels ...Label) List {
+	if len(labels) == 0 {
+		return emptyList
+	}
+	return &list{labels: labels}
+}
+
+func Filter(l List, keys ...Key) List {
+	if len(keys) == 0 {
+		return l
+	}
+	return &filter{keys: keys, underlying: l}
+}
+
+func NewMap(labels ...Label) Map {
+	return listMap{labels: labels}
+}
+
+func MergeMaps(srcs ...Map) Map {
+	var nonNil []Map
+	for _, src := range srcs {
+		if src != nil {
+			nonNil = append(nonNil, src)
+		}
+	}
+	if len(nonNil) == 1 {
+		return nonNil[0]
+	}
+	return mapChain{maps: nonNil}
+}

vendor/golang.org/x/tools/internal/fastwalk/fastwalk.go

@@ -14,14 +14,14 @@ import (
 	"sync"
 )
 
-// TraverseLink is used as a return value from WalkFuncs to indicate that the
+// ErrTraverseLink is used as a return value from WalkFuncs to indicate that the
 // symlink named in the call may be traversed.
-var TraverseLink = errors.New("fastwalk: traverse symlink, assuming target is a directory")
+var ErrTraverseLink = errors.New("fastwalk: traverse symlink, assuming target is a directory")
 
-// SkipFiles is a used as a return value from WalkFuncs to indicate that the
+// ErrSkipFiles is a used as a return value from WalkFuncs to indicate that the
 // callback should not be called for any other files in the current directory.
 // Child directories will still be traversed.
-var SkipFiles = errors.New("fastwalk: skip remaining files in directory")
+var ErrSkipFiles = errors.New("fastwalk: skip remaining files in directory")
 
 // Walk is a faster implementation of filepath.Walk.
 //
@@ -167,7 +167,7 @@ func (w *walker) onDirEnt(dirName, baseName string, typ os.FileMode) error {
 
 	err := w.fn(joined, typ)
 	if typ == os.ModeSymlink {
-		if err == TraverseLink {
+		if err == ErrTraverseLink {
 			// Set callbackDone so we don't call it twice for both the
 			// symlink-as-symlink and the symlink-as-directory later:
 			w.enqueue(walkItem{dir: joined, callbackDone: true})

vendor/golang.org/x/tools/internal/fastwalk/fastwalk_portable.go

@@ -26,7 +26,7 @@ func readDir(dirName string, fn func(dirName, entName string, typ os.FileMode) e
 			continue
 		}
 		if err := fn(dirName, fi.Name(), fi.Mode()&os.ModeType); err != nil {
-			if err == SkipFiles {
+			if err == ErrSkipFiles {
 				skipFiles = true
 				continue
 			}

vendor/golang.org/x/tools/internal/fastwalk/fastwalk_unix.go

@@ -66,7 +66,7 @@ func readDir(dirName string, fn func(dirName, entName string, typ os.FileMode) e
 			continue
 		}
 		if err := fn(dirName, name, typ); err != nil {
-			if err == SkipFiles {
+			if err == ErrSkipFiles {
 				skipFiles = true
 				continue
 			}
@@ -76,8 +76,9 @@ func readDir(dirName string, fn func(dirName, entName string, typ os.FileMode) e
 }
 
 func parseDirEnt(buf []byte) (consumed int, name string, typ os.FileMode) {
-	// golang.org/issue/15653
-	dirent := (*syscall.Dirent)(unsafe.Pointer(&buf[0]))
+	// golang.org/issue/37269
+	dirent := &syscall.Dirent{}
+	copy((*[unsafe.Sizeof(syscall.Dirent{})]byte)(unsafe.Pointer(dirent))[:], buf)
 	if v := unsafe.Offsetof(dirent.Reclen) + unsafe.Sizeof(dirent.Reclen); uintptr(len(buf)) < v {
 		panic(fmt.Sprintf("buf size of %d smaller than dirent header size %d", len(buf), v))
 	}

vendor/golang.org/x/tools/internal/gocommand/invoke.go

@@ -0,0 +1,210 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package gocommand is a helper for calling the go command.
+package gocommand
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"regexp"
+	"strings"
+	"sync"
+	"time"
+
+	"golang.org/x/tools/internal/event"
+)
+
+// An Runner will run go command invocations and serialize
+// them if it sees a concurrency error.
+type Runner struct {
+	// LoadMu guards packages.Load calls and associated state.
+	loadMu sync.Mutex
+	// locked is true when we hold the mutex and have incremented.
+	locked         bool
+	serializeLoads int
+}
+
+// 1.13: go: updates to go.mod needed, but contents have changed
+// 1.14: go: updating go.mod: existing contents have changed since last read
+var modConcurrencyError = regexp.MustCompile(`go:.*go.mod.*contents have changed`)
+
+// Run is a convenience wrapper around RunRaw.
+// It returns only stdout and a "friendly" error.
+func (runner *Runner) Run(ctx context.Context, inv Invocation) (*bytes.Buffer, error) {
+	stdout, _, friendly, _ := runner.runRaw(ctx, inv)
+	return stdout, friendly
+}
+
+// RunPiped runs the invocation serially, always waiting for any concurrent
+// invocations to complete first.
+func (runner *Runner) RunPiped(ctx context.Context, inv Invocation, stdout, stderr io.Writer) error {
+	_, err := runner.runPiped(ctx, inv, stdout, stderr)
+	return err
+}
+
+// RunRaw runs the invocation, serializing requests only if they fight over
+// go.mod changes.
+func (runner *Runner) RunRaw(ctx context.Context, inv Invocation) (*bytes.Buffer, *bytes.Buffer, error, error) {
+	return runner.runRaw(ctx, inv)
+}
+
+func (runner *Runner) runPiped(ctx context.Context, inv Invocation, stdout, stderr io.Writer) (error, error) {
+	runner.loadMu.Lock()
+	runner.serializeLoads++
+	runner.locked = true
+
+	defer func() {
+		runner.locked = false
+		runner.serializeLoads--
+		runner.loadMu.Unlock()
+	}()
+
+	return inv.runWithFriendlyError(ctx, stdout, stderr)
+}
+
+func (runner *Runner) runRaw(ctx context.Context, inv Invocation) (*bytes.Buffer, *bytes.Buffer, error, error) {
+	// We want to run invocations concurrently as much as possible. However,
+	// if go.mod updates are needed, only one can make them and the others will
+	// fail. We need to retry in those cases, but we don't want to thrash so
+	// badly we never recover. To avoid that, once we've seen one concurrency
+	// error, start serializing everything until the backlog has cleared out.
+	runner.loadMu.Lock()
+	if runner.serializeLoads == 0 {
+		runner.loadMu.Unlock()
+	} else {
+		runner.locked = true
+		runner.serializeLoads++
+	}
+	defer func() {
+		if runner.locked {
+			runner.locked = false
+			runner.serializeLoads--
+			runner.loadMu.Unlock()
+		}
+	}()
+
+	for {
+		stdout, stderr := &bytes.Buffer{}, &bytes.Buffer{}
+		friendlyErr, err := inv.runWithFriendlyError(ctx, stdout, stderr)
+		if friendlyErr == nil || !modConcurrencyError.MatchString(friendlyErr.Error()) {
+			return stdout, stderr, friendlyErr, err
+		}
+		event.Error(ctx, "Load concurrency error, will retry serially", err)
+		if !runner.locked {
+			runner.loadMu.Lock()
+			runner.serializeLoads++
+			runner.locked = true
+		}
+	}
+}
+
+// An Invocation represents a call to the go command.
+type Invocation struct {
+	Verb       string
+	Args       []string
+	BuildFlags []string
+	Env        []string
+	WorkingDir string
+	Logf       func(format string, args ...interface{})
+}
+
+func (i *Invocation) runWithFriendlyError(ctx context.Context, stdout, stderr io.Writer) (friendlyError error, rawError error) {
+	rawError = i.run(ctx, stdout, stderr)
+	if rawError != nil {
+		friendlyError = rawError
+		// Check for 'go' executable not being found.
+		if ee, ok := rawError.(*exec.Error); ok && ee.Err == exec.ErrNotFound {
+			friendlyError = fmt.Errorf("go command required, not found: %v", ee)
+		}
+		if ctx.Err() != nil {
+			friendlyError = ctx.Err()
+		}
+		friendlyError = fmt.Errorf("err: %v: stderr: %s", friendlyError, stderr)
+	}
+	return
+}
+
+func (i *Invocation) run(ctx context.Context, stdout, stderr io.Writer) error {
+	log := i.Logf
+	if log == nil {
+		log = func(string, ...interface{}) {}
+	}
+
+	goArgs := []string{i.Verb}
+	switch i.Verb {
+	case "mod":
+		// mod needs the sub-verb before build flags.
+		goArgs = append(goArgs, i.Args[0])
+		goArgs = append(goArgs, i.BuildFlags...)
+		goArgs = append(goArgs, i.Args[1:]...)
+	case "env":
+		// env doesn't take build flags.
+		goArgs = append(goArgs, i.Args...)
+	default:
+		goArgs = append(goArgs, i.BuildFlags...)
+		goArgs = append(goArgs, i.Args...)
+	}
+	cmd := exec.Command("go", goArgs...)
+	cmd.Stdout = stdout
+	cmd.Stderr = stderr
+	// On darwin the cwd gets resolved to the real path, which breaks anything that
+	// expects the working directory to keep the original path, including the
+	// go command when dealing with modules.
+	// The Go stdlib has a special feature where if the cwd and the PWD are the
+	// same node then it trusts the PWD, so by setting it in the env for the child
+	// process we fix up all the paths returned by the go command.
+	cmd.Env = append(os.Environ(), i.Env...)
+	if i.WorkingDir != "" {
+		cmd.Env = append(cmd.Env, "PWD="+i.WorkingDir)
+		cmd.Dir = i.WorkingDir
+	}
+
+	defer func(start time.Time) { log("%s for %v", time.Since(start), cmdDebugStr(cmd)) }(time.Now())
+
+	return runCmdContext(ctx, cmd)
+}
+
+// runCmdContext is like exec.CommandContext except it sends os.Interrupt
+// before os.Kill.
+func runCmdContext(ctx context.Context, cmd *exec.Cmd) error {
+	if err := cmd.Start(); err != nil {
+		return err
+	}
+	resChan := make(chan error, 1)
+	go func() {
+		resChan <- cmd.Wait()
+	}()
+
+	select {
+	case err := <-resChan:
+		return err
+	case <-ctx.Done():
+	}
+	// Cancelled. Interrupt and see if it ends voluntarily.
+	cmd.Process.Signal(os.Interrupt)
+	select {
+	case err := <-resChan:
+		return err
+	case <-time.After(time.Second):
+	}
+	// Didn't shut down in response to interrupt. Kill it hard.
+	cmd.Process.Kill()
+	return <-resChan
+}
+
+func cmdDebugStr(cmd *exec.Cmd) string {
+	env := make(map[string]string)
+	for _, kv := range cmd.Env {
+		split := strings.Split(kv, "=")
+		k, v := split[0], split[1]
+		env[k] = v
+	}
+
+	return fmt.Sprintf("GOROOT=%v GOPATH=%v GO111MODULE=%v GOPROXY=%v PWD=%v go %v", env["GOROOT"], env["GOPATH"], env["GO111MODULE"], env["GOPROXY"], env["PWD"], cmd.Args)
+}

vendor/golang.org/x/tools/internal/gocommand/vendor.go

@@ -0,0 +1,102 @@
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package gocommand
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"golang.org/x/mod/semver"
+)
+
+// ModuleJSON holds information about a module.
+type ModuleJSON struct {
+	Path      string      // module path
+	Replace   *ModuleJSON // replaced by this module
+	Main      bool        // is this the main module?
+	Indirect  bool        // is this module only an indirect dependency of main module?
+	Dir       string      // directory holding files for this module, if any
+	GoMod     string      // path to go.mod file for this module, if any
+	GoVersion string      // go version used in module
+}
+
+var modFlagRegexp = regexp.MustCompile(`-mod[ =](\w+)`)
+
+// VendorEnabled reports whether vendoring is enabled. It takes a *Runner to execute Go commands
+// with the supplied context.Context and Invocation. The Invocation can contain pre-defined fields,
+// of which only Verb and Args are modified to run the appropriate Go command.
+// Inspired by setDefaultBuildMod in modload/init.go
+func VendorEnabled(ctx context.Context, inv Invocation, r *Runner) (*ModuleJSON, bool, error) {
+	mainMod, go114, err := getMainModuleAnd114(ctx, inv, r)
+	if err != nil {
+		return nil, false, err
+	}
+
+	// We check the GOFLAGS to see if there is anything overridden or not.
+	inv.Verb = "env"
+	inv.Args = []string{"GOFLAGS"}
+	stdout, err := r.Run(ctx, inv)
+	if err != nil {
+		return nil, false, err
+	}
+	goflags := string(bytes.TrimSpace(stdout.Bytes()))
+	matches := modFlagRegexp.FindStringSubmatch(goflags)
+	var modFlag string
+	if len(matches) != 0 {
+		modFlag = matches[1]
+	}
+	if modFlag != "" {
+		// Don't override an explicit '-mod=' argument.
+		return mainMod, modFlag == "vendor", nil
+	}
+	if mainMod == nil || !go114 {
+		return mainMod, false, nil
+	}
+	// Check 1.14's automatic vendor mode.
+	if fi, err := os.Stat(filepath.Join(mainMod.Dir, "vendor")); err == nil && fi.IsDir() {
+		if mainMod.GoVersion != "" && semver.Compare("v"+mainMod.GoVersion, "v1.14") >= 0 {
+			// The Go version is at least 1.14, and a vendor directory exists.
+			// Set -mod=vendor by default.
+			return mainMod, true, nil
+		}
+	}
+	return mainMod, false, nil
+}
+
+// getMainModuleAnd114 gets the main module's information and whether the
+// go command in use is 1.14+. This is the information needed to figure out
+// if vendoring should be enabled.
+func getMainModuleAnd114(ctx context.Context, inv Invocation, r *Runner) (*ModuleJSON, bool, error) {
+	const format = `{{.Path}}
+{{.Dir}}
+{{.GoMod}}
+{{.GoVersion}}
+{{range context.ReleaseTags}}{{if eq . "go1.14"}}{{.}}{{end}}{{end}}
+`
+	inv.Verb = "list"
+	inv.Args = []string{"-m", "-f", format}
+	stdout, err := r.Run(ctx, inv)
+	if err != nil {
+		return nil, false, err
+	}
+
+	lines := strings.Split(stdout.String(), "\n")
+	if len(lines) < 5 {
+		return nil, false, fmt.Errorf("unexpected stdout: %q", stdout.String())
+	}
+	mod := &ModuleJSON{
+		Path:      lines[0],
+		Dir:       lines[1],
+		GoMod:     lines[2],
+		GoVersion: lines[3],
+		Main:      true,
+	}
+	return mod, lines[4] == "go1.14", nil
+}

vendor/golang.org/x/tools/internal/gopathwalk/walk.go

@@ -23,8 +23,10 @@ import (
 
 // Options controls the behavior of a Walk call.
 type Options struct {
-	Debug          bool // Enable debug logging
-	ModulesEnabled bool // Search module caches. Also disables legacy goimports ignore rules.
+	// If Logf is non-nil, debug logging is enabled through this function.
+	Logf func(format string, args ...interface{})
+	// Search module caches. Also disables legacy goimports ignore rules.
+	ModulesEnabled bool
 }
 
 // RootType indicates the type of a Root.
@@ -77,16 +79,17 @@ func WalkSkip(roots []Root, add func(root Root, dir string), skip func(root Root
 	}
 }
 
+// walkDir creates a walker and starts fastwalk with this walker.
 func walkDir(root Root, add func(Root, string), skip func(root Root, dir string) bool, opts Options) {
 	if _, err := os.Stat(root.Path); os.IsNotExist(err) {
-		if opts.Debug {
-			log.Printf("skipping nonexistent directory: %v", root.Path)
+		if opts.Logf != nil {
+			opts.Logf("skipping nonexistent directory: %v", root.Path)
 		}
 		return
 	}
 	start := time.Now()
-	if opts.Debug {
-		log.Printf("gopathwalk: scanning %s", root.Path)
+	if opts.Logf != nil {
+		opts.Logf("gopathwalk: scanning %s", root.Path)
 	}
 	w := &walker{
 		root: root,
@@ -99,8 +102,8 @@ func walkDir(root Root, add func(Root, string), skip func(root Root, dir string)
 		log.Printf("gopathwalk: scanning directory %v: %v", root.Path, err)
 	}
 
-	if opts.Debug {
-		log.Printf("gopathwalk: scanned %s in %v", root.Path, time.Since(start))
+	if opts.Logf != nil {
+		opts.Logf("gopathwalk: scanned %s in %v", root.Path, time.Since(start))
 	}
 }
 
@@ -114,7 +117,7 @@ type walker struct {
 	ignoredDirs []os.FileInfo // The ignored directories, loaded from .goimportsignore files.
 }
 
-// init initializes the walker based on its Options.
+// init initializes the walker based on its Options
 func (w *walker) init() {
 	var ignoredPaths []string
 	if w.root.Type == RootModuleCache {
@@ -129,11 +132,11 @@ func (w *walker) init() {
 		full := filepath.Join(w.root.Path, p)
 		if fi, err := os.Stat(full); err == nil {
 			w.ignoredDirs = append(w.ignoredDirs, fi)
-			if w.opts.Debug {
-				log.Printf("Directory added to ignore list: %s", full)
+			if w.opts.Logf != nil {
+				w.opts.Logf("Directory added to ignore list: %s", full)
 			}
-		} else if w.opts.Debug {
-			log.Printf("Error statting ignored directory: %v", err)
+		} else if w.opts.Logf != nil {
+			w.opts.Logf("Error statting ignored directory: %v", err)
 		}
 	}
 }
@@ -144,11 +147,11 @@ func (w *walker) init() {
 func (w *walker) getIgnoredDirs(path string) []string {
 	file := filepath.Join(path, ".goimportsignore")
 	slurp, err := ioutil.ReadFile(file)
-	if w.opts.Debug {
+	if w.opts.Logf != nil {
 		if err != nil {
-			log.Print(err)
+			w.opts.Logf("%v", err)
 		} else {
-			log.Printf("Read %s", file)
+			w.opts.Logf("Read %s", file)
 		}
 	}
 	if err != nil {
@@ -167,6 +170,7 @@ func (w *walker) getIgnoredDirs(path string) []string {
 	return ignoredDirs
 }
 
+// shouldSkipDir reports whether the file should be skipped or not.
 func (w *walker) shouldSkipDir(fi os.FileInfo, dir string) bool {
 	for _, ignoredDir := range w.ignoredDirs {
 		if os.SameFile(fi, ignoredDir) {
@@ -180,20 +184,21 @@ func (w *walker) shouldSkipDir(fi os.FileInfo, dir string) bool {
 	return false
 }
 
+// walk walks through the given path.
 func (w *walker) walk(path string, typ os.FileMode) error {
 	dir := filepath.Dir(path)
 	if typ.IsRegular() {
 		if dir == w.root.Path && (w.root.Type == RootGOROOT || w.root.Type == RootGOPATH) {
 			// Doesn't make sense to have regular files
 			// directly in your $GOPATH/src or $GOROOT/src.
-			return fastwalk.SkipFiles
+			return fastwalk.ErrSkipFiles
 		}
 		if !strings.HasSuffix(path, ".go") {
 			return nil
 		}
 
 		w.add(w.root, dir)
-		return fastwalk.SkipFiles
+		return fastwalk.ErrSkipFiles
 	}
 	if typ == os.ModeDir {
 		base := filepath.Base(path)
@@ -221,7 +226,7 @@ func (w *walker) walk(path string, typ os.FileMode) error {
 			return nil
 		}
 		if w.shouldTraverse(dir, fi) {
-			return fastwalk.TraverseLink
+			return fastwalk.ErrTraverseLink
 		}
 	}
 	return nil

vendor/golang.org/x/tools/internal/imports/fix.go

@@ -14,7 +14,6 @@ import (
 	"go/token"
 	"io/ioutil"
 	"os"
-	"os/exec"
 	"path"
 	"path/filepath"
 	"reflect"
@@ -22,12 +21,11 @@ import (
 	"strconv"
 	"strings"
 	"sync"
-	"time"
 	"unicode"
 	"unicode/utf8"
 
 	"golang.org/x/tools/go/ast/astutil"
-	"golang.org/x/tools/go/packages"
+	"golang.org/x/tools/internal/gocommand"
 	"golang.org/x/tools/internal/gopathwalk"
 )
 
@@ -52,7 +50,8 @@ var importToGroup = []func(env *ProcessEnv, importPath string) (num int, ok bool
 		return
 	},
 	func(_ *ProcessEnv, importPath string) (num int, ok bool) {
-		if strings.Contains(importPath, ".") {
+		firstComponent := strings.Split(importPath, "/")[0]
+		if strings.Contains(firstComponent, ".") {
 			return 1, true
 		}
 		return
@@ -82,7 +81,8 @@ type ImportFix struct {
 	// IdentName is the identifier that this fix will add or remove.
 	IdentName string
 	// FixType is the type of fix this is (AddImport, DeleteImport, SetImportName).
-	FixType ImportFixType
+	FixType   ImportFixType
+	Relevance int // see pkg
 }
 
 // An ImportInfo represents a single import statement.
@@ -263,7 +263,7 @@ type pass struct {
 
 // loadPackageNames saves the package names for everything referenced by imports.
 func (p *pass) loadPackageNames(imports []*ImportInfo) error {
-	if p.env.Debug {
+	if p.env.Logf != nil {
 		p.env.Logf("loading package names for %v packages", len(imports))
 		defer func() {
 			p.env.Logf("done loading package names for %v packages", len(imports))
@@ -302,7 +302,7 @@ func (p *pass) importIdentifier(imp *ImportInfo) string {
 	if known != nil && known.name != "" {
 		return known.name
 	}
-	return importPathToAssumedName(imp.ImportPath)
+	return ImportPathToAssumedName(imp.ImportPath)
 }
 
 // load reads in everything necessary to run a pass, and reports whether the
@@ -335,7 +335,7 @@ func (p *pass) load() ([]*ImportFix, bool) {
 	if p.loadRealPackageNames {
 		err := p.loadPackageNames(append(imports, p.candidates...))
 		if err != nil {
-			if p.env.Debug {
+			if p.env.Logf != nil {
 				p.env.Logf("loading package names: %v", err)
 			}
 			return nil, false
@@ -435,7 +435,7 @@ func (p *pass) importSpecName(imp *ImportInfo) string {
 	}
 
 	ident := p.importIdentifier(imp)
-	if ident == importPathToAssumedName(imp.ImportPath) {
+	if ident == ImportPathToAssumedName(imp.ImportPath) {
 		return "" // ident not needed since the assumed and real names are the same.
 	}
 	return ident
@@ -529,7 +529,7 @@ func getFixes(fset *token.FileSet, f *ast.File, filename string, env *ProcessEnv
 		return nil, err
 	}
 	srcDir := filepath.Dir(abs)
-	if env.Debug {
+	if env.Logf != nil {
 		env.Logf("fixImports(filename=%q), abs=%q, srcDir=%q ...", filename, abs, srcDir)
 	}
 
@@ -537,7 +537,7 @@ func getFixes(fset *token.FileSet, f *ast.File, filename string, env *ProcessEnv
 	// derive package names from import paths, see if the file is already
 	// complete. We can't add any imports yet, because we don't know
 	// if missing references are actually package vars.
-	p := &pass{fset: fset, f: f, srcDir: srcDir}
+	p := &pass{fset: fset, f: f, srcDir: srcDir, env: env}
 	if fixes, done := p.load(); done {
 		return fixes, nil
 	}
@@ -559,8 +559,7 @@ func getFixes(fset *token.FileSet, f *ast.File, filename string, env *ProcessEnv
 	}
 
 	// Third pass: get real package names where we had previously used
-	// the naive algorithm. This is the first step that will use the
-	// environment, so we provide it here for the first time.
+	// the naive algorithm.
 	p = &pass{fset: fset, f: f, srcDir: srcDir, env: env}
 	p.loadRealPackageNames = true
 	p.otherFiles = otherFiles
@@ -585,89 +584,127 @@ func getFixes(fset *token.FileSet, f *ast.File, filename string, env *ProcessEnv
 	return fixes, nil
 }
 
-// getCandidatePkgs returns the list of pkgs that are accessible from filename,
-// optionall filtered to only packages named pkgName.
-func getCandidatePkgs(pkgName, filename string, env *ProcessEnv) ([]*pkg, error) {
-	// TODO(heschi): filter out current package. (Don't forget x_test can import x.)
+// Highest relevance, used for the standard library. Chosen arbitrarily to
+// match pre-existing gopls code.
+const MaxRelevance = 7
 
-	var result []*pkg
+// getCandidatePkgs works with the passed callback to find all acceptable packages.
+// It deduplicates by import path, and uses a cached stdlib rather than reading
+// from disk.
+func getCandidatePkgs(ctx context.Context, wrappedCallback *scanCallback, filename, filePkg string, env *ProcessEnv) error {
+	notSelf := func(p *pkg) bool {
+		return p.packageName != filePkg || p.dir != filepath.Dir(filename)
+	}
 	// Start off with the standard library.
-	for importPath := range stdlib {
-		if pkgName != "" && path.Base(importPath) != pkgName {
-			continue
-		}
-		result = append(result, &pkg{
+	for importPath, exports := range stdlib {
+		p := &pkg{
 			dir:             filepath.Join(env.GOROOT, "src", importPath),
 			importPathShort: importPath,
 			packageName:     path.Base(importPath),
-			relevance:       0,
-		})
-	}
-
-	// Exclude goroot results -- getting them is relatively expensive, not cached,
-	// and generally redundant with the in-memory version.
-	exclude := []gopathwalk.RootType{gopathwalk.RootGOROOT}
-	// Only the go/packages resolver uses the first argument, and nobody uses that resolver.
-	scannedPkgs, err := env.GetResolver().scan(nil, true, exclude)
-	if err != nil {
-		return nil, err
+			relevance:       MaxRelevance,
+		}
+		if notSelf(p) && wrappedCallback.packageNameLoaded(p) {
+			wrappedCallback.exportsLoaded(p, exports)
+		}
 	}
 
+	var mu sync.Mutex
 	dupCheck := map[string]struct{}{}
-	for _, pkg := range scannedPkgs {
-		if pkgName != "" && pkg.packageName != pkgName {
-			continue
-		}
-		if !canUse(filename, pkg.dir) {
-			continue
-		}
-		if _, ok := dupCheck[pkg.importPathShort]; ok {
-			continue
-		}
-		dupCheck[pkg.importPathShort] = struct{}{}
-		result = append(result, pkg)
+
+	scanFilter := &scanCallback{
+		rootFound: func(root gopathwalk.Root) bool {
+			// Exclude goroot results -- getting them is relatively expensive, not cached,
+			// and generally redundant with the in-memory version.
+			return root.Type != gopathwalk.RootGOROOT && wrappedCallback.rootFound(root)
+		},
+		dirFound: wrappedCallback.dirFound,
+		packageNameLoaded: func(pkg *pkg) bool {
+			mu.Lock()
+			defer mu.Unlock()
+			if _, ok := dupCheck[pkg.importPathShort]; ok {
+				return false
+			}
+			dupCheck[pkg.importPathShort] = struct{}{}
+			return notSelf(pkg) && wrappedCallback.packageNameLoaded(pkg)
+		},
+		exportsLoaded: func(pkg *pkg, exports []string) {
+			// If we're an x_test, load the package under test's test variant.
+			if strings.HasSuffix(filePkg, "_test") && pkg.dir == filepath.Dir(filename) {
+				var err error
+				_, exports, err = loadExportsFromFiles(ctx, env, pkg.dir, true)
+				if err != nil {
+					return
+				}
+			}
+			wrappedCallback.exportsLoaded(pkg, exports)
+		},
 	}
+	return env.GetResolver().scan(ctx, scanFilter)
+}
 
-	// Sort first by relevance, then by package name, with import path as a tiebreaker.
-	sort.Slice(result, func(i, j int) bool {
-		pi, pj := result[i], result[j]
-		if pi.relevance != pj.relevance {
-			return pi.relevance < pj.relevance
-		}
-		if pi.packageName != pj.packageName {
-			return pi.packageName < pj.packageName
-		}
-		return pi.importPathShort < pj.importPathShort
-	})
+func ScoreImportPaths(ctx context.Context, env *ProcessEnv, paths []string) map[string]int {
+	result := make(map[string]int)
+	for _, path := range paths {
+		result[path] = env.GetResolver().scoreImportPath(ctx, path)
+	}
+	return result
+}
 
-	return result, nil
+func PrimeCache(ctx context.Context, env *ProcessEnv) error {
+	// Fully scan the disk for directories, but don't actually read any Go files.
+	callback := &scanCallback{
+		rootFound: func(gopathwalk.Root) bool {
+			return true
+		},
+		dirFound: func(pkg *pkg) bool {
+			return false
+		},
+		packageNameLoaded: func(pkg *pkg) bool {
+			return false
+		},
+	}
+	return getCandidatePkgs(ctx, callback, "", "", env)
 }
 
 func candidateImportName(pkg *pkg) string {
-	if importPathToAssumedName(pkg.importPathShort) != pkg.packageName {
+	if ImportPathToAssumedName(pkg.importPathShort) != pkg.packageName {
 		return pkg.packageName
 	}
 	return ""
 }
 
 // getAllCandidates gets all of the candidates to be imported, regardless of if they are needed.
-func getAllCandidates(filename string, env *ProcessEnv) ([]ImportFix, error) {
-	pkgs, err := getCandidatePkgs("", filename, env)
-	if err != nil {
-		return nil, err
+func getAllCandidates(ctx context.Context, wrapped func(ImportFix), searchPrefix, filename, filePkg string, env *ProcessEnv) error {
+	callback := &scanCallback{
+		rootFound: func(gopathwalk.Root) bool {
+			return true
+		},
+		dirFound: func(pkg *pkg) bool {
+			if !canUse(filename, pkg.dir) {
+				return false
+			}
+			// Try the assumed package name first, then a simpler path match
+			// in case of packages named vN, which are not uncommon.
+			return strings.HasPrefix(ImportPathToAssumedName(pkg.importPathShort), searchPrefix) ||
+				strings.HasPrefix(path.Base(pkg.importPathShort), searchPrefix)
+		},
+		packageNameLoaded: func(pkg *pkg) bool {
+			if !strings.HasPrefix(pkg.packageName, searchPrefix) {
+				return false
+			}
+			wrapped(ImportFix{
+				StmtInfo: ImportInfo{
+					ImportPath: pkg.importPathShort,
+					Name:       candidateImportName(pkg),
+				},
+				IdentName: pkg.packageName,
+				FixType:   AddImport,
+				Relevance: pkg.relevance,
+			})
+			return false
+		},
 	}
-	result := make([]ImportFix, 0, len(pkgs))
-	for _, pkg := range pkgs {
-		result = append(result, ImportFix{
-			StmtInfo: ImportInfo{
-				ImportPath: pkg.importPathShort,
-				Name:       candidateImportName(pkg),
-			},
-			IdentName: pkg.packageName,
-			FixType:   AddImport,
-		})
-	}
-	return result, nil
+	return getCandidatePkgs(ctx, callback, filename, filePkg, env)
 }
 
 // A PackageExport is a package and its exports.
@@ -676,64 +713,63 @@ type PackageExport struct {
 	Exports []string
 }
 
-func getPackageExports(completePackage, filename string, env *ProcessEnv) ([]PackageExport, error) {
-	pkgs, err := getCandidatePkgs(completePackage, filename, env)
-	if err != nil {
-		return nil, err
+func getPackageExports(ctx context.Context, wrapped func(PackageExport), searchPkg, filename, filePkg string, env *ProcessEnv) error {
+	callback := &scanCallback{
+		rootFound: func(gopathwalk.Root) bool {
+			return true
+		},
+		dirFound: func(pkg *pkg) bool {
+			return pkgIsCandidate(filename, references{searchPkg: nil}, pkg)
+		},
+		packageNameLoaded: func(pkg *pkg) bool {
+			return pkg.packageName == searchPkg
+		},
+		exportsLoaded: func(pkg *pkg, exports []string) {
+			sort.Strings(exports)
+			wrapped(PackageExport{
+				Fix: &ImportFix{
+					StmtInfo: ImportInfo{
+						ImportPath: pkg.importPathShort,
+						Name:       candidateImportName(pkg),
+					},
+					IdentName: pkg.packageName,
+					FixType:   AddImport,
+					Relevance: pkg.relevance,
+				},
+				Exports: exports,
+			})
+		},
 	}
-
-	results := make([]PackageExport, 0, len(pkgs))
-	for _, pkg := range pkgs {
-		fix := &ImportFix{
-			StmtInfo: ImportInfo{
-				ImportPath: pkg.importPathShort,
-				Name:       candidateImportName(pkg),
-			},
-			IdentName: pkg.packageName,
-			FixType:   AddImport,
-		}
-		var exports []string
-		if e, ok := stdlib[pkg.importPathShort]; ok {
-			exports = e
-		} else {
-			exports, err = loadExportsForPackage(context.Background(), env, completePackage, pkg)
-			if err != nil {
-				if env.Debug {
-					env.Logf("while completing %q, error loading exports from %q: %v", completePackage, pkg.importPathShort, err)
-				}
-				continue
-			}
-		}
-		sort.Strings(exports)
-		results = append(results, PackageExport{
-			Fix:     fix,
-			Exports: exports,
-		})
-	}
-
-	return results, nil
+	return getCandidatePkgs(ctx, callback, filename, filePkg, env)
 }
 
 // ProcessEnv contains environment variables and settings that affect the use of
 // the go command, the go/build package, etc.
 type ProcessEnv struct {
 	LocalPrefix string
-	Debug       bool
+
+	GocmdRunner *gocommand.Runner
+
+	BuildFlags []string
 
 	// If non-empty, these will be used instead of the
 	// process-wide values.
 	GOPATH, GOROOT, GO111MODULE, GOPROXY, GOFLAGS, GOSUMDB string
 	WorkingDir                                             string
 
-	// If true, use go/packages regardless of the environment.
-	ForceGoPackages bool
-
-	// Logf is the default logger for the ProcessEnv.
+	// If Logf is non-nil, debug logging is enabled through this function.
 	Logf func(format string, args ...interface{})
 
 	resolver Resolver
 }
 
+// CopyConfig copies the env's configuration into a new env.
+func (e *ProcessEnv) CopyConfig() *ProcessEnv {
+	copy := *e
+	copy.resolver = nil
+	return &copy
+}
+
 func (e *ProcessEnv) env() []string {
 	env := os.Environ()
 	add := func(k, v string) {
@@ -757,73 +793,55 @@ func (e *ProcessEnv) GetResolver() Resolver {
 	if e.resolver != nil {
 		return e.resolver
 	}
-	if e.ForceGoPackages {
-		e.resolver = &goPackagesResolver{env: e}
-		return e.resolver
-	}
-
-	out, err := e.invokeGo("env", "GOMOD")
+	out, err := e.invokeGo(context.TODO(), "env", "GOMOD")
 	if err != nil || len(bytes.TrimSpace(out.Bytes())) == 0 {
-		e.resolver = &gopathResolver{env: e}
+		e.resolver = newGopathResolver(e)
 		return e.resolver
 	}
-	e.resolver = &ModuleResolver{env: e}
+	e.resolver = newModuleResolver(e)
 	return e.resolver
 }
 
-func (e *ProcessEnv) newPackagesConfig(mode packages.LoadMode) *packages.Config {
-	return &packages.Config{
-		Mode: mode,
-		Dir:  e.WorkingDir,
-		Env:  e.env(),
-	}
-}
-
 func (e *ProcessEnv) buildContext() *build.Context {
 	ctx := build.Default
 	ctx.GOROOT = e.GOROOT
 	ctx.GOPATH = e.GOPATH
 
-	// As of Go 1.14, build.Context has a WorkingDir field
+	// As of Go 1.14, build.Context has a Dir field
 	// (see golang.org/issue/34860).
 	// Populate it only if present.
-	if wd := reflect.ValueOf(&ctx).Elem().FieldByName("WorkingDir"); wd.IsValid() && wd.Kind() == reflect.String {
-		wd.SetString(e.WorkingDir)
+	rc := reflect.ValueOf(&ctx).Elem()
+	dir := rc.FieldByName("Dir")
+	if !dir.IsValid() {
+		// Working drafts of Go 1.14 named the field "WorkingDir" instead.
+		// TODO(bcmills): Remove this case after the Go 1.14 beta has been released.
+		dir = rc.FieldByName("WorkingDir")
 	}
+	if dir.IsValid() && dir.Kind() == reflect.String {
+		dir.SetString(e.WorkingDir)
+	}
+
 	return &ctx
 }
 
-func (e *ProcessEnv) invokeGo(args ...string) (*bytes.Buffer, error) {
-	cmd := exec.Command("go", args...)
-	stdout := &bytes.Buffer{}
-	stderr := &bytes.Buffer{}
-	cmd.Stdout = stdout
-	cmd.Stderr = stderr
-	cmd.Env = e.env()
-	cmd.Dir = e.WorkingDir
-
-	if e.Debug {
-		defer func(start time.Time) { e.Logf("%s for %v", time.Since(start), cmdDebugStr(cmd)) }(time.Now())
+func (e *ProcessEnv) invokeGo(ctx context.Context, verb string, args ...string) (*bytes.Buffer, error) {
+	inv := gocommand.Invocation{
+		Verb:       verb,
+		Args:       args,
+		BuildFlags: e.BuildFlags,
+		Env:        e.env(),
+		Logf:       e.Logf,
+		WorkingDir: e.WorkingDir,
 	}
-	if err := cmd.Run(); err != nil {
-		return nil, fmt.Errorf("running go: %v (stderr:\n%s)", err, stderr)
-	}
-	return stdout, nil
-}
-
-func cmdDebugStr(cmd *exec.Cmd) string {
-	env := make(map[string]string)
-	for _, kv := range cmd.Env {
-		split := strings.Split(kv, "=")
-		k, v := split[0], split[1]
-		env[k] = v
-	}
-
-	return fmt.Sprintf("GOROOT=%v GOPATH=%v GO111MODULE=%v GOPROXY=%v PWD=%v go %v", env["GOROOT"], env["GOPATH"], env["GO111MODULE"], env["GOPROXY"], env["PWD"], cmd.Args)
+	return e.GocmdRunner.Run(ctx, inv)
 }
 
 func addStdlibCandidates(pass *pass, refs references) {
 	add := func(pkg string) {
+		// Prevent self-imports.
+		if path.Base(pkg) == pass.f.Name.Name && filepath.Join(pass.env.GOROOT, "src", pkg) == pass.srcDir {
+			return
+		}
 		exports := copyExports(stdlib[pkg])
 		pass.addCandidate(
 			&ImportInfo{ImportPath: pkg},
@@ -848,94 +866,65 @@ func addStdlibCandidates(pass *pass, refs references) {
 type Resolver interface {
 	// loadPackageNames loads the package names in importPaths.
 	loadPackageNames(importPaths []string, srcDir string) (map[string]string, error)
-	// scan finds (at least) the packages satisfying refs. If loadNames is true,
-	// package names will be set on the results, and dirs whose package name
-	// could not be determined will be excluded.
-	scan(refs references, loadNames bool, exclude []gopathwalk.RootType) ([]*pkg, error)
+	// scan works with callback to search for packages. See scanCallback for details.
+	scan(ctx context.Context, callback *scanCallback) error
 	// loadExports returns the set of exported symbols in the package at dir.
 	// loadExports may be called concurrently.
-	loadExports(ctx context.Context, pkg *pkg) (string, []string, error)
+	loadExports(ctx context.Context, pkg *pkg, includeTest bool) (string, []string, error)
+	// scoreImportPath returns the relevance for an import path.
+	scoreImportPath(ctx context.Context, path string) int
 
 	ClearForNewScan()
 }
 
-// gopackagesResolver implements resolver for GOPATH and module workspaces using go/packages.
-type goPackagesResolver struct {
-	env *ProcessEnv
-}
-
-func (r *goPackagesResolver) ClearForNewScan() {}
-
-func (r *goPackagesResolver) loadPackageNames(importPaths []string, srcDir string) (map[string]string, error) {
-	if len(importPaths) == 0 {
-		return nil, nil
-	}
-	cfg := r.env.newPackagesConfig(packages.LoadFiles)
-	pkgs, err := packages.Load(cfg, importPaths...)
-	if err != nil {
-		return nil, err
-	}
-	names := map[string]string{}
-	for _, pkg := range pkgs {
-		names[VendorlessPath(pkg.PkgPath)] = pkg.Name
-	}
-	// We may not have found all the packages. Guess the rest.
-	for _, path := range importPaths {
-		if _, ok := names[path]; ok {
-			continue
-		}
-		names[path] = importPathToAssumedName(path)
-	}
-	return names, nil
-
-}
-
-func (r *goPackagesResolver) scan(refs references, _ bool, _ []gopathwalk.RootType) ([]*pkg, error) {
-	var loadQueries []string
-	for pkgName := range refs {
-		loadQueries = append(loadQueries, "iamashamedtousethedisabledqueryname="+pkgName)
-	}
-	sort.Strings(loadQueries)
-	cfg := r.env.newPackagesConfig(packages.LoadFiles)
-	goPackages, err := packages.Load(cfg, loadQueries...)
-	if err != nil {
-		return nil, err
-	}
-
-	var scan []*pkg
-	for _, goPackage := range goPackages {
-		scan = append(scan, &pkg{
-			dir:             filepath.Dir(goPackage.CompiledGoFiles[0]),
-			importPathShort: VendorlessPath(goPackage.PkgPath),
-			goPackage:       goPackage,
-			packageName:     goPackage.Name,
-		})
-	}
-	return scan, nil
-}
-
-func (r *goPackagesResolver) loadExports(ctx context.Context, pkg *pkg) (string, []string, error) {
-	if pkg.goPackage == nil {
-		return "", nil, fmt.Errorf("goPackage not set")
-	}
-	var exports []string
-	fset := token.NewFileSet()
-	for _, fname := range pkg.goPackage.CompiledGoFiles {
-		f, err := parser.ParseFile(fset, fname, nil, 0)
-		if err != nil {
-			return "", nil, fmt.Errorf("parsing %s: %v", fname, err)
-		}
-		for name := range f.Scope.Objects {
-			if ast.IsExported(name) {
-				exports = append(exports, name)
-			}
-		}
-	}
-	return pkg.goPackage.Name, exports, nil
+// A scanCallback controls a call to scan and receives its results.
+// In general, minor errors will be silently discarded; a user should not
+// expect to receive a full series of calls for everything.
+type scanCallback struct {
+	// rootFound is called before scanning a new root dir. If it returns true,
+	// the root will be scanned. Returning false will not necessarily prevent
+	// directories from that root making it to dirFound.
+	rootFound func(gopathwalk.Root) bool
+	// dirFound is called when a directory is found that is possibly a Go package.
+	// pkg will be populated with everything except packageName.
+	// If it returns true, the package's name will be loaded.
+	dirFound func(pkg *pkg) bool
+	// packageNameLoaded is called when a package is found and its name is loaded.
+	// If it returns true, the package's exports will be loaded.
+	packageNameLoaded func(pkg *pkg) bool
+	// exportsLoaded is called when a package's exports have been loaded.
+	exportsLoaded func(pkg *pkg, exports []string)
 }
 
 func addExternalCandidates(pass *pass, refs references, filename string) error {
-	dirScan, err := pass.env.GetResolver().scan(refs, false, nil)
+	var mu sync.Mutex
+	found := make(map[string][]pkgDistance)
+	callback := &scanCallback{
+		rootFound: func(gopathwalk.Root) bool {
+			return true // We want everything.
+		},
+		dirFound: func(pkg *pkg) bool {
+			return pkgIsCandidate(filename, refs, pkg)
+		},
+		packageNameLoaded: func(pkg *pkg) bool {
+			if _, want := refs[pkg.packageName]; !want {
+				return false
+			}
+			if pkg.dir == pass.srcDir && pass.f.Name.Name == pkg.packageName {
+				// The candidate is in the same directory and has the
+				// same package name. Don't try to import ourselves.
+				return false
+			}
+			if !canUse(filename, pkg.dir) {
+				return false
+			}
+			mu.Lock()
+			defer mu.Unlock()
+			found[pkg.packageName] = append(found[pkg.packageName], pkgDistance{pkg, distance(pass.srcDir, pkg.dir)})
+			return false // We'll do our own loading after we sort.
+		},
+	}
+	err := pass.env.GetResolver().scan(context.Background(), callback)
 	if err != nil {
 		return err
 	}
@@ -962,7 +951,7 @@ func addExternalCandidates(pass *pass, refs references, filename string) error {
 		go func(pkgName string, symbols map[string]bool) {
 			defer wg.Done()
 
-			found, err := findImport(ctx, pass, dirScan, pkgName, symbols, filename)
+			found, err := findImport(ctx, pass, found[pkgName], pkgName, symbols, filename)
 
 			if err != nil {
 				firstErrOnce.Do(func() {
@@ -1006,7 +995,7 @@ func notIdentifier(ch rune) bool {
 		ch >= utf8.RuneSelf && (unicode.IsLetter(ch) || unicode.IsDigit(ch)))
 }
 
-// importPathToAssumedName returns the assumed package name of an import path.
+// ImportPathToAssumedName returns the assumed package name of an import path.
 // It does this using only string parsing of the import path.
 // It picks the last element of the path that does not look like a major
 // version, and then picks the valid identifier off the start of that element.
@@ -1014,7 +1003,7 @@ func notIdentifier(ch rune) bool {
 // clarity.
 // This function could be moved to a standard package and exported if we want
 // for use in other tools.
-func importPathToAssumedName(importPath string) string {
+func ImportPathToAssumedName(importPath string) string {
 	base := path.Base(importPath)
 	if strings.HasPrefix(base, "v") {
 		if _, err := strconv.Atoi(base[1:]); err == nil {
@@ -1033,24 +1022,36 @@ func importPathToAssumedName(importPath string) string {
 
 // gopathResolver implements resolver for GOPATH workspaces.
 type gopathResolver struct {
-	env   *ProcessEnv
-	cache *dirInfoCache
+	env      *ProcessEnv
+	walked   bool
+	cache    *dirInfoCache
+	scanSema chan struct{} // scanSema prevents concurrent scans.
 }
 
-func (r *gopathResolver) init() {
-	if r.cache == nil {
-		r.cache = &dirInfoCache{
-			dirs: map[string]*directoryPackageInfo{},
-		}
+func newGopathResolver(env *ProcessEnv) *gopathResolver {
+	r := &gopathResolver{
+		env: env,
+		cache: &dirInfoCache{
+			dirs:      map[string]*directoryPackageInfo{},
+			listeners: map[*int]cacheListener{},
+		},
+		scanSema: make(chan struct{}, 1),
 	}
+	r.scanSema <- struct{}{}
+	return r
 }
 
 func (r *gopathResolver) ClearForNewScan() {
-	r.cache = nil
+	<-r.scanSema
+	r.cache = &dirInfoCache{
+		dirs:      map[string]*directoryPackageInfo{},
+		listeners: map[*int]cacheListener{},
+	}
+	r.walked = false
+	r.scanSema <- struct{}{}
 }
 
 func (r *gopathResolver) loadPackageNames(importPaths []string, srcDir string) (map[string]string, error) {
-	r.init()
 	names := map[string]string{}
 	for _, path := range importPaths {
 		names[path] = importPathToName(r.env, path, srcDir)
@@ -1130,7 +1131,6 @@ func packageDirToName(dir string) (packageName string, err error) {
 }
 
 type pkg struct {
-	goPackage       *packages.Package
 	dir             string // absolute file path to pkg directory ("/usr/lib/go/src/net/http")
 	importPathShort string // vendorless import path ("net/http", "a/b")
 	packageName     string // package name loaded from source if requested
@@ -1178,8 +1178,7 @@ func distance(basepath, targetpath string) int {
 	return strings.Count(p, string(filepath.Separator)) + 1
 }
 
-func (r *gopathResolver) scan(_ references, loadNames bool, exclude []gopathwalk.RootType) ([]*pkg, error) {
-	r.init()
+func (r *gopathResolver) scan(ctx context.Context, callback *scanCallback) error {
 	add := func(root gopathwalk.Root, dir string) {
 		// We assume cached directories have not changed. We can skip them and their
 		// children.
@@ -1196,56 +1195,84 @@ func (r *gopathResolver) scan(_ references, loadNames bool, exclude []gopathwalk
 		}
 		r.cache.Store(dir, info)
 	}
-	roots := filterRoots(gopathwalk.SrcDirsRoots(r.env.buildContext()), exclude)
-	gopathwalk.Walk(roots, add, gopathwalk.Options{Debug: r.env.Debug, ModulesEnabled: false})
-	var result []*pkg
-	for _, dir := range r.cache.Keys() {
-		info, ok := r.cache.Load(dir)
-		if !ok {
-			continue
-		}
-		if loadNames {
-			var err error
-			info, err = r.cache.CachePackageName(info)
-			if err != nil {
-				continue
-			}
+	processDir := func(info directoryPackageInfo) {
+		// Skip this directory if we were not able to get the package information successfully.
+		if scanned, err := info.reachedStatus(directoryScanned); !scanned || err != nil {
+			return
 		}
 
 		p := &pkg{
 			importPathShort: info.nonCanonicalImportPath,
-			dir:             dir,
-			relevance:       1,
-			packageName:     info.packageName,
+			dir:             info.dir,
+			relevance:       MaxRelevance - 1,
 		}
 		if info.rootType == gopathwalk.RootGOROOT {
-			p.relevance = 0
+			p.relevance = MaxRelevance
+		}
+
+		if !callback.dirFound(p) {
+			return
+		}
+		var err error
+		p.packageName, err = r.cache.CachePackageName(info)
+		if err != nil {
+			return
+		}
+
+		if !callback.packageNameLoaded(p) {
+			return
+		}
+		if _, exports, err := r.loadExports(ctx, p, false); err == nil {
+			callback.exportsLoaded(p, exports)
 		}
-		result = append(result, p)
 	}
-	return result, nil
+	stop := r.cache.ScanAndListen(ctx, processDir)
+	defer stop()
+	// The callback is not necessarily safe to use in the goroutine below. Process roots eagerly.
+	roots := filterRoots(gopathwalk.SrcDirsRoots(r.env.buildContext()), callback.rootFound)
+	// We can't cancel walks, because we need them to finish to have a usable
+	// cache. Instead, run them in a separate goroutine and detach.
+	scanDone := make(chan struct{})
+	go func() {
+		select {
+		case <-ctx.Done():
+			return
+		case <-r.scanSema:
+		}
+		defer func() { r.scanSema <- struct{}{} }()
+		gopathwalk.Walk(roots, add, gopathwalk.Options{Logf: r.env.Logf, ModulesEnabled: false})
+		close(scanDone)
+	}()
+	select {
+	case <-ctx.Done():
+	case <-scanDone:
+	}
+	return nil
 }
 
-func filterRoots(roots []gopathwalk.Root, exclude []gopathwalk.RootType) []gopathwalk.Root {
+func (r *gopathResolver) scoreImportPath(ctx context.Context, path string) int {
+	if _, ok := stdlib[path]; ok {
+		return MaxRelevance
+	}
+	return MaxRelevance - 1
+}
+
+func filterRoots(roots []gopathwalk.Root, include func(gopathwalk.Root) bool) []gopathwalk.Root {
 	var result []gopathwalk.Root
-outer:
 	for _, root := range roots {
-		for _, i := range exclude {
-			if i == root.Type {
-				continue outer
-			}
+		if !include(root) {
+			continue
 		}
 		result = append(result, root)
 	}
 	return result
 }
 
-func (r *gopathResolver) loadExports(ctx context.Context, pkg *pkg) (string, []string, error) {
-	r.init()
-	if info, ok := r.cache.Load(pkg.dir); ok {
+func (r *gopathResolver) loadExports(ctx context.Context, pkg *pkg, includeTest bool) (string, []string, error) {
+	if info, ok := r.cache.Load(pkg.dir); ok && !includeTest {
 		return r.cache.CacheExports(ctx, r.env, info)
 	}
-	return loadExportsFromFiles(ctx, r.env, pkg.dir)
+	return loadExportsFromFiles(ctx, r.env, pkg.dir, includeTest)
 }
 
 // VendorlessPath returns the devendorized version of the import path ipath.
@@ -1261,7 +1288,7 @@ func VendorlessPath(ipath string) string {
 	return ipath
 }
 
-func loadExportsFromFiles(ctx context.Context, env *ProcessEnv, dir string) (string, []string, error) {
+func loadExportsFromFiles(ctx context.Context, env *ProcessEnv, dir string, includeTest bool) (string, []string, error) {
 	var exports []string
 
 	// Look for non-test, buildable .go files which could provide exports.
@@ -1272,7 +1299,7 @@ func loadExportsFromFiles(ctx context.Context, env *ProcessEnv, dir string) (str
 	var files []os.FileInfo
 	for _, fi := range all {
 		name := fi.Name()
-		if !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
+		if !strings.HasSuffix(name, ".go") || (!includeTest && strings.HasSuffix(name, "_test.go")) {
 			continue
 		}
 		match, err := env.buildContext().MatchFile(dir, fi.Name())
@@ -1298,13 +1325,20 @@ func loadExportsFromFiles(ctx context.Context, env *ProcessEnv, dir string) (str
 		fullFile := filepath.Join(dir, fi.Name())
 		f, err := parser.ParseFile(fset, fullFile, nil, 0)
 		if err != nil {
-			return "", nil, fmt.Errorf("parsing %s: %v", fullFile, err)
+			if env.Logf != nil {
+				env.Logf("error parsing %v: %v", fullFile, err)
+			}
+			continue
 		}
 		if f.Name.Name == "documentation" {
 			// Special case from go/build.ImportDir, not
 			// handled by MatchFile above.
 			continue
 		}
+		if includeTest && strings.HasSuffix(f.Name.Name, "_test") {
+			// x_test package. We want internal test files only.
+			continue
+		}
 		pkgName = f.Name.Name
 		for name := range f.Scope.Objects {
 			if ast.IsExported(name) {
@@ -1313,7 +1347,7 @@ func loadExportsFromFiles(ctx context.Context, env *ProcessEnv, dir string) (str
 		}
 	}
 
-	if env.Debug {
+	if env.Logf != nil {
 		sortedExports := append([]string(nil), exports...)
 		sort.Strings(sortedExports)
 		env.Logf("loaded exports in dir %v (package %v): %v", dir, pkgName, strings.Join(sortedExports, ", "))
@@ -1323,42 +1357,19 @@ func loadExportsFromFiles(ctx context.Context, env *ProcessEnv, dir string) (str
 
 // findImport searches for a package with the given symbols.
 // If no package is found, findImport returns ("", false, nil)
-func findImport(ctx context.Context, pass *pass, dirScan []*pkg, pkgName string, symbols map[string]bool, filename string) (*pkg, error) {
-	pkgDir, err := filepath.Abs(filename)
-	if err != nil {
-		return nil, err
-	}
-	pkgDir = filepath.Dir(pkgDir)
-
-	// Find candidate packages, looking only at their directory names first.
-	var candidates []pkgDistance
-	for _, pkg := range dirScan {
-		if pkg.dir == pkgDir && pass.f.Name.Name == pkgName {
-			// The candidate is in the same directory and has the
-			// same package name. Don't try to import ourselves.
-			continue
-		}
-		if pkgIsCandidate(filename, pkgName, pkg) {
-			candidates = append(candidates, pkgDistance{
-				pkg:      pkg,
-				distance: distance(pkgDir, pkg.dir),
-			})
-		}
-	}
-
+func findImport(ctx context.Context, pass *pass, candidates []pkgDistance, pkgName string, symbols map[string]bool, filename string) (*pkg, error) {
 	// Sort the candidates by their import package length,
 	// assuming that shorter package names are better than long
 	// ones.  Note that this sorts by the de-vendored name, so
 	// there's no "penalty" for vendoring.
 	sort.Sort(byDistanceOrImportPathShortLength(candidates))
-	if pass.env.Debug {
+	if pass.env.Logf != nil {
 		for i, c := range candidates {
 			pass.env.Logf("%s candidate %d/%d: %v in %v", pkgName, i+1, len(candidates), c.pkg.importPathShort, c.pkg.dir)
 		}
 	}
 
 	// Collect exports for packages with matching names.
-
 	rescv := make([]chan *pkg, len(candidates))
 	for i := range candidates {
 		rescv[i] = make(chan *pkg, 1)
@@ -1390,12 +1401,14 @@ func findImport(ctx context.Context, pass *pass, dirScan []*pkg, pkgName string,
 					wg.Done()
 				}()
 
-				if pass.env.Debug {
+				if pass.env.Logf != nil {
 					pass.env.Logf("loading exports in dir %s (seeking package %s)", c.pkg.dir, pkgName)
 				}
-				exports, err := loadExportsForPackage(ctx, pass.env, pkgName, c.pkg)
+				// If we're an x_test, load the package under test's test variant.
+				includeTest := strings.HasSuffix(pass.f.Name.Name, "_test") && c.pkg.dir == pass.srcDir
+				_, exports, err := pass.env.GetResolver().loadExports(ctx, c.pkg, includeTest)
 				if err != nil {
-					if pass.env.Debug {
+					if pass.env.Logf != nil {
 						pass.env.Logf("loading exports in dir %s (seeking package %s): %v", c.pkg.dir, pkgName, err)
 					}
 					resc <- nil
@@ -1430,17 +1443,6 @@ func findImport(ctx context.Context, pass *pass, dirScan []*pkg, pkgName string,
 	return nil, nil
 }
 
-func loadExportsForPackage(ctx context.Context, env *ProcessEnv, expectPkg string, pkg *pkg) ([]string, error) {
-	pkgName, exports, err := env.GetResolver().loadExports(ctx, pkg)
-	if err != nil {
-		return nil, err
-	}
-	if expectPkg != pkgName {
-		return nil, fmt.Errorf("dir %v is package %v, wanted %v", pkg.dir, pkgName, expectPkg)
-	}
-	return exports, err
-}
-
 // pkgIsCandidate reports whether pkg is a candidate for satisfying the
 // finding which package pkgIdent in the file named by filename is trying
 // to refer to.
@@ -1453,7 +1455,7 @@ func loadExportsForPackage(ctx context.Context, env *ProcessEnv, expectPkg strin
 // filename is the file being formatted.
 // pkgIdent is the package being searched for, like "client" (if
 // searching for "client.New")
-func pkgIsCandidate(filename, pkgIdent string, pkg *pkg) bool {
+func pkgIsCandidate(filename string, refs references, pkg *pkg) bool {
 	// Check "internal" and "vendor" visibility:
 	if !canUse(filename, pkg.dir) {
 		return false
@@ -1471,17 +1473,18 @@ func pkgIsCandidate(filename, pkgIdent string, pkg *pkg) bool {
 	// "bar", which is strongly discouraged
 	// anyway. There's no reason goimports needs
 	// to be slow just to accommodate that.
-	lastTwo := lastTwoComponents(pkg.importPathShort)
-	if strings.Contains(lastTwo, pkgIdent) {
-		return true
-	}
-	if hasHyphenOrUpperASCII(lastTwo) && !hasHyphenOrUpperASCII(pkgIdent) {
-		lastTwo = lowerASCIIAndRemoveHyphen(lastTwo)
+	for pkgIdent := range refs {
+		lastTwo := lastTwoComponents(pkg.importPathShort)
 		if strings.Contains(lastTwo, pkgIdent) {
 			return true
 		}
+		if hasHyphenOrUpperASCII(lastTwo) && !hasHyphenOrUpperASCII(pkgIdent) {
+			lastTwo = lowerASCIIAndRemoveHyphen(lastTwo)
+			if strings.Contains(lastTwo, pkgIdent) {
+				return true
+			}
+		}
 	}
-
 	return false
 }
 

vendor/golang.org/x/tools/internal/imports/imports.go

@@ -11,6 +11,7 @@ package imports
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"fmt"
 	"go/ast"
 	"go/build"
@@ -20,12 +21,13 @@ import (
 	"go/token"
 	"io"
 	"io/ioutil"
-	"log"
+	"os"
 	"regexp"
 	"strconv"
 	"strings"
 
 	"golang.org/x/tools/go/ast/astutil"
+	"golang.org/x/tools/internal/gocommand"
 )
 
 // Options is golang.org/x/tools/imports.Options with extra internal-only options.
@@ -83,42 +85,54 @@ func FixImports(filename string, src []byte, opt *Options) (fixes []*ImportFix,
 	return getFixes(fileSet, file, filename, opt.Env)
 }
 
-// ApplyFix will apply all of the fixes to the file and format it.
-func ApplyFixes(fixes []*ImportFix, filename string, src []byte, opt *Options) (formatted []byte, err error) {
+// ApplyFixes applies all of the fixes to the file and formats it. extraMode
+// is added in when parsing the file.
+func ApplyFixes(fixes []*ImportFix, filename string, src []byte, opt *Options, extraMode parser.Mode) (formatted []byte, err error) {
 	src, opt, err = initialize(filename, src, opt)
 	if err != nil {
 		return nil, err
 	}
 
+	// Don't use parse() -- we don't care about fragments or statement lists
+	// here, and we need to work with unparseable files.
 	fileSet := token.NewFileSet()
-	file, adjust, err := parse(fileSet, filename, src, opt)
-	if err != nil {
+	parserMode := parser.Mode(0)
+	if opt.Comments {
+		parserMode |= parser.ParseComments
+	}
+	if opt.AllErrors {
+		parserMode |= parser.AllErrors
+	}
+	parserMode |= extraMode
+
+	file, err := parser.ParseFile(fileSet, filename, src, parserMode)
+	if file == nil {
 		return nil, err
 	}
 
 	// Apply the fixes to the file.
 	apply(fileSet, file, fixes)
 
-	return formatFile(fileSet, file, src, adjust, opt)
+	return formatFile(fileSet, file, src, nil, opt)
 }
 
-// GetAllCandidates gets all of the standard library candidate packages to import in
-// sorted order on import path.
-func GetAllCandidates(filename string, opt *Options) (pkgs []ImportFix, err error) {
-	_, opt, err = initialize(filename, nil, opt)
+// GetAllCandidates gets all of the packages starting with prefix that can be
+// imported by filename, sorted by import path.
+func GetAllCandidates(ctx context.Context, callback func(ImportFix), searchPrefix, filename, filePkg string, opt *Options) error {
+	_, opt, err := initialize(filename, []byte{}, opt)
 	if err != nil {
-		return nil, err
+		return err
 	}
-	return getAllCandidates(filename, opt.Env)
+	return getAllCandidates(ctx, callback, searchPrefix, filename, filePkg, opt.Env)
 }
 
 // GetPackageExports returns all known packages with name pkg and their exports.
-func GetPackageExports(pkg, filename string, opt *Options) (exports []PackageExport, err error) {
-	_, opt, err = initialize(filename, nil, opt)
+func GetPackageExports(ctx context.Context, callback func(PackageExport), searchPkg, filename, filePkg string, opt *Options) error {
+	_, opt, err := initialize(filename, []byte{}, opt)
 	if err != nil {
-		return nil, err
+		return err
 	}
-	return getPackageExports(pkg, filename, opt.Env)
+	return getPackageExports(ctx, callback, searchPkg, filename, filePkg, opt.Env)
 }
 
 // initialize sets the values for opt and src.
@@ -133,16 +147,18 @@ func initialize(filename string, src []byte, opt *Options) ([]byte, *Options, er
 	// Set the env if the user has not provided it.
 	if opt.Env == nil {
 		opt.Env = &ProcessEnv{
-			GOPATH: build.Default.GOPATH,
-			GOROOT: build.Default.GOROOT,
+			GOPATH:      build.Default.GOPATH,
+			GOROOT:      build.Default.GOROOT,
+			GOFLAGS:     os.Getenv("GOFLAGS"),
+			GO111MODULE: os.Getenv("GO111MODULE"),
+			GOPROXY:     os.Getenv("GOPROXY"),
+			GOSUMDB:     os.Getenv("GOSUMDB"),
 		}
 	}
-
-	// Set the logger if the user has not provided it.
-	if opt.Env.Logf == nil {
-		opt.Env.Logf = log.Printf
+	// Set the gocmdRunner if the user has not provided it.
+	if opt.Env.GocmdRunner == nil {
+		opt.Env.GocmdRunner = &gocommand.Runner{}
 	}
-
 	if src == nil {
 		b, err := ioutil.ReadFile(filename)
 		if err != nil {

vendor/golang.org/x/tools/internal/imports/mod.go

@@ -13,11 +13,10 @@ import (
 	"sort"
 	"strconv"
 	"strings"
-	"sync"
 
+	"golang.org/x/mod/module"
+	"golang.org/x/tools/internal/gocommand"
 	"golang.org/x/tools/internal/gopathwalk"
-	"golang.org/x/tools/internal/module"
-	"golang.org/x/tools/internal/semver"
 )
 
 // ModuleResolver implements resolver for modules using the go command as little
@@ -25,32 +24,42 @@ import (
 type ModuleResolver struct {
 	env            *ProcessEnv
 	moduleCacheDir string
-	dummyVendorMod *ModuleJSON // If vendoring is enabled, the pseudo-module that represents the /vendor directory.
+	dummyVendorMod *gocommand.ModuleJSON // If vendoring is enabled, the pseudo-module that represents the /vendor directory.
+	roots          []gopathwalk.Root
+	scanSema       chan struct{} // scanSema prevents concurrent scans and guards scannedRoots.
+	scannedRoots   map[gopathwalk.Root]bool
 
-	Initialized   bool
-	Main          *ModuleJSON
-	ModsByModPath []*ModuleJSON // All modules, ordered by # of path components in module Path...
-	ModsByDir     []*ModuleJSON // ...or Dir.
+	initialized   bool
+	main          *gocommand.ModuleJSON
+	modsByModPath []*gocommand.ModuleJSON // All modules, ordered by # of path components in module Path...
+	modsByDir     []*gocommand.ModuleJSON // ...or Dir.
 
 	// moduleCacheCache stores information about the module cache.
 	moduleCacheCache *dirInfoCache
 	otherCache       *dirInfoCache
 }
 
-type ModuleJSON struct {
-	Path      string      // module path
-	Replace   *ModuleJSON // replaced by this module
-	Main      bool        // is this the main module?
-	Dir       string      // directory holding files for this module, if any
-	GoMod     string      // path to go.mod file for this module, if any
-	GoVersion string      // go version used in module
+func newModuleResolver(e *ProcessEnv) *ModuleResolver {
+	r := &ModuleResolver{
+		env:      e,
+		scanSema: make(chan struct{}, 1),
+	}
+	r.scanSema <- struct{}{}
+	return r
 }
 
 func (r *ModuleResolver) init() error {
-	if r.Initialized {
+	if r.initialized {
 		return nil
 	}
-	mainMod, vendorEnabled, err := vendorEnabled(r.env)
+
+	inv := gocommand.Invocation{
+		BuildFlags: r.env.BuildFlags,
+		Env:        r.env.env(),
+		Logf:       r.env.Logf,
+		WorkingDir: r.env.WorkingDir,
+	}
+	mainMod, vendorEnabled, err := gocommand.VendorEnabled(context.TODO(), inv, r.env.GocmdRunner)
 	if err != nil {
 		return err
 	}
@@ -58,13 +67,13 @@ func (r *ModuleResolver) init() error {
 	if mainMod != nil && vendorEnabled {
 		// Vendor mode is on, so all the non-Main modules are irrelevant,
 		// and we need to search /vendor for everything.
-		r.Main = mainMod
-		r.dummyVendorMod = &ModuleJSON{
+		r.main = mainMod
+		r.dummyVendorMod = &gocommand.ModuleJSON{
 			Path: "",
 			Dir:  filepath.Join(mainMod.Dir, "vendor"),
 		}
-		r.ModsByModPath = []*ModuleJSON{mainMod, r.dummyVendorMod}
-		r.ModsByDir = []*ModuleJSON{mainMod, r.dummyVendorMod}
+		r.modsByModPath = []*gocommand.ModuleJSON{mainMod, r.dummyVendorMod}
+		r.modsByDir = []*gocommand.ModuleJSON{mainMod, r.dummyVendorMod}
 	} else {
 		// Vendor mode is off, so run go list -m ... to find everything.
 		r.initAllMods()
@@ -72,79 +81,123 @@ func (r *ModuleResolver) init() error {
 
 	r.moduleCacheDir = filepath.Join(filepath.SplitList(r.env.GOPATH)[0], "/pkg/mod")
 
-	sort.Slice(r.ModsByModPath, func(i, j int) bool {
+	sort.Slice(r.modsByModPath, func(i, j int) bool {
 		count := func(x int) int {
-			return strings.Count(r.ModsByModPath[x].Path, "/")
+			return strings.Count(r.modsByModPath[x].Path, "/")
 		}
 		return count(j) < count(i) // descending order
 	})
-	sort.Slice(r.ModsByDir, func(i, j int) bool {
+	sort.Slice(r.modsByDir, func(i, j int) bool {
 		count := func(x int) int {
-			return strings.Count(r.ModsByDir[x].Dir, "/")
+			return strings.Count(r.modsByDir[x].Dir, "/")
 		}
 		return count(j) < count(i) // descending order
 	})
 
+	r.roots = []gopathwalk.Root{
+		{filepath.Join(r.env.GOROOT, "/src"), gopathwalk.RootGOROOT},
+	}
+	if r.main != nil {
+		r.roots = append(r.roots, gopathwalk.Root{r.main.Dir, gopathwalk.RootCurrentModule})
+	}
+	if vendorEnabled {
+		r.roots = append(r.roots, gopathwalk.Root{r.dummyVendorMod.Dir, gopathwalk.RootOther})
+	} else {
+		addDep := func(mod *gocommand.ModuleJSON) {
+			if mod.Replace == nil {
+				// This is redundant with the cache, but we'll skip it cheaply enough.
+				r.roots = append(r.roots, gopathwalk.Root{mod.Dir, gopathwalk.RootModuleCache})
+			} else {
+				r.roots = append(r.roots, gopathwalk.Root{mod.Dir, gopathwalk.RootOther})
+			}
+		}
+		// Walk dependent modules before scanning the full mod cache, direct deps first.
+		for _, mod := range r.modsByModPath {
+			if !mod.Indirect && !mod.Main {
+				addDep(mod)
+			}
+		}
+		for _, mod := range r.modsByModPath {
+			if mod.Indirect && !mod.Main {
+				addDep(mod)
+			}
+		}
+		r.roots = append(r.roots, gopathwalk.Root{r.moduleCacheDir, gopathwalk.RootModuleCache})
+	}
+
+	r.scannedRoots = map[gopathwalk.Root]bool{}
 	if r.moduleCacheCache == nil {
 		r.moduleCacheCache = &dirInfoCache{
-			dirs: map[string]*directoryPackageInfo{},
+			dirs:      map[string]*directoryPackageInfo{},
+			listeners: map[*int]cacheListener{},
 		}
 	}
 	if r.otherCache == nil {
 		r.otherCache = &dirInfoCache{
-			dirs: map[string]*directoryPackageInfo{},
+			dirs:      map[string]*directoryPackageInfo{},
+			listeners: map[*int]cacheListener{},
 		}
 	}
-	r.Initialized = true
+	r.initialized = true
 	return nil
 }
 
 func (r *ModuleResolver) initAllMods() error {
-	stdout, err := r.env.invokeGo("list", "-m", "-json", "...")
+	stdout, err := r.env.invokeGo(context.TODO(), "list", "-m", "-json", "...")
 	if err != nil {
 		return err
 	}
 	for dec := json.NewDecoder(stdout); dec.More(); {
-		mod := &ModuleJSON{}
+		mod := &gocommand.ModuleJSON{}
 		if err := dec.Decode(mod); err != nil {
 			return err
 		}
 		if mod.Dir == "" {
-			if r.env.Debug {
+			if r.env.Logf != nil {
 				r.env.Logf("module %v has not been downloaded and will be ignored", mod.Path)
 			}
 			// Can't do anything with a module that's not downloaded.
 			continue
 		}
-		r.ModsByModPath = append(r.ModsByModPath, mod)
-		r.ModsByDir = append(r.ModsByDir, mod)
+		// golang/go#36193: the go command doesn't always clean paths.
+		mod.Dir = filepath.Clean(mod.Dir)
+		r.modsByModPath = append(r.modsByModPath, mod)
+		r.modsByDir = append(r.modsByDir, mod)
 		if mod.Main {
-			r.Main = mod
+			r.main = mod
 		}
 	}
 	return nil
 }
 
 func (r *ModuleResolver) ClearForNewScan() {
+	<-r.scanSema
+	r.scannedRoots = map[gopathwalk.Root]bool{}
 	r.otherCache = &dirInfoCache{
-		dirs: map[string]*directoryPackageInfo{},
+		dirs:      map[string]*directoryPackageInfo{},
+		listeners: map[*int]cacheListener{},
 	}
+	r.scanSema <- struct{}{}
 }
 
 func (r *ModuleResolver) ClearForNewMod() {
-	env := r.env
+	<-r.scanSema
 	*r = ModuleResolver{
-		env: env,
+		env:              r.env,
+		moduleCacheCache: r.moduleCacheCache,
+		otherCache:       r.otherCache,
+		scanSema:         r.scanSema,
 	}
 	r.init()
+	r.scanSema <- struct{}{}
 }
 
 // findPackage returns the module and directory that contains the package at
 // the given import path, or returns nil, "" if no module is in scope.
-func (r *ModuleResolver) findPackage(importPath string) (*ModuleJSON, string) {
+func (r *ModuleResolver) findPackage(importPath string) (*gocommand.ModuleJSON, string) {
 	// This can't find packages in the stdlib, but that's harmless for all
 	// the existing code paths.
-	for _, m := range r.ModsByModPath {
+	for _, m := range r.modsByModPath {
 		if !strings.HasPrefix(importPath, m.Path) {
 			continue
 		}
@@ -211,7 +264,7 @@ func (r *ModuleResolver) cacheKeys() []string {
 }
 
 // cachePackageName caches the package name for a dir already in the cache.
-func (r *ModuleResolver) cachePackageName(info directoryPackageInfo) (directoryPackageInfo, error) {
+func (r *ModuleResolver) cachePackageName(info directoryPackageInfo) (string, error) {
 	if info.rootType == gopathwalk.RootModuleCache {
 		return r.moduleCacheCache.CachePackageName(info)
 	}
@@ -227,7 +280,7 @@ func (r *ModuleResolver) cacheExports(ctx context.Context, env *ProcessEnv, info
 
 // findModuleByDir returns the module that contains dir, or nil if no such
 // module is in scope.
-func (r *ModuleResolver) findModuleByDir(dir string) *ModuleJSON {
+func (r *ModuleResolver) findModuleByDir(dir string) *gocommand.ModuleJSON {
 	// This is quite tricky and may not be correct. dir could be:
 	// - a package in the main module.
 	// - a replace target underneath the main module's directory.
@@ -238,7 +291,7 @@ func (r *ModuleResolver) findModuleByDir(dir string) *ModuleJSON {
 	// - in /vendor/ in -mod=vendor mode.
 	//    - nested module? Dunno.
 	// Rumor has it that replace targets cannot contain other replace targets.
-	for _, m := range r.ModsByDir {
+	for _, m := range r.modsByDir {
 		if !strings.HasPrefix(dir, m.Dir) {
 			continue
 		}
@@ -254,7 +307,7 @@ func (r *ModuleResolver) findModuleByDir(dir string) *ModuleJSON {
 
 // dirIsNestedModule reports if dir is contained in a nested module underneath
 // mod, not actually in mod.
-func (r *ModuleResolver) dirIsNestedModule(dir string, mod *ModuleJSON) bool {
+func (r *ModuleResolver) dirIsNestedModule(dir string, mod *gocommand.ModuleJSON) bool {
 	if !strings.HasPrefix(dir, mod.Dir) {
 		return false
 	}
@@ -333,41 +386,49 @@ func (r *ModuleResolver) loadPackageNames(importPaths []string, srcDir string) (
 	return names, nil
 }
 
-func (r *ModuleResolver) scan(_ references, loadNames bool, exclude []gopathwalk.RootType) ([]*pkg, error) {
+func (r *ModuleResolver) scan(ctx context.Context, callback *scanCallback) error {
 	if err := r.init(); err != nil {
-		return nil, err
+		return err
 	}
 
-	// Walk GOROOT, GOPATH/pkg/mod, and the main module.
-	roots := []gopathwalk.Root{
-		{filepath.Join(r.env.GOROOT, "/src"), gopathwalk.RootGOROOT},
-	}
-	if r.Main != nil {
-		roots = append(roots, gopathwalk.Root{r.Main.Dir, gopathwalk.RootCurrentModule})
-	}
-	if r.dummyVendorMod != nil {
-		roots = append(roots, gopathwalk.Root{r.dummyVendorMod.Dir, gopathwalk.RootOther})
-	} else {
-		roots = append(roots, gopathwalk.Root{r.moduleCacheDir, gopathwalk.RootModuleCache})
-		// Walk replace targets, just in case they're not in any of the above.
-		for _, mod := range r.ModsByModPath {
-			if mod.Replace != nil {
-				roots = append(roots, gopathwalk.Root{mod.Dir, gopathwalk.RootOther})
-			}
+	processDir := func(info directoryPackageInfo) {
+		// Skip this directory if we were not able to get the package information successfully.
+		if scanned, err := info.reachedStatus(directoryScanned); !scanned || err != nil {
+			return
 		}
+		pkg, err := r.canonicalize(info)
+		if err != nil {
+			return
+		}
+
+		if !callback.dirFound(pkg) {
+			return
+		}
+		pkg.packageName, err = r.cachePackageName(info)
+		if err != nil {
+			return
+		}
+
+		if !callback.packageNameLoaded(pkg) {
+			return
+		}
+		_, exports, err := r.loadExports(ctx, pkg, false)
+		if err != nil {
+			return
+		}
+		callback.exportsLoaded(pkg, exports)
 	}
 
-	roots = filterRoots(roots, exclude)
+	// Start processing everything in the cache, and listen for the new stuff
+	// we discover in the walk below.
+	stop1 := r.moduleCacheCache.ScanAndListen(ctx, processDir)
+	defer stop1()
+	stop2 := r.otherCache.ScanAndListen(ctx, processDir)
+	defer stop2()
 
-	var result []*pkg
-	var mu sync.Mutex
-
-	// We assume cached directories have not changed. We can skip them and their
-	// children.
+	// We assume cached directories are fully cached, including all their
+	// children, and have not changed. We can skip them.
 	skip := func(root gopathwalk.Root, dir string) bool {
-		mu.Lock()
-		defer mu.Unlock()
-
 		info, ok := r.cacheLoad(dir)
 		if !ok {
 			return false
@@ -379,44 +440,64 @@ func (r *ModuleResolver) scan(_ references, loadNames bool, exclude []gopathwalk
 		return packageScanned
 	}
 
-	// Add anything new to the cache. We'll process everything in it below.
+	// Add anything new to the cache, and process it if we're still listening.
 	add := func(root gopathwalk.Root, dir string) {
-		mu.Lock()
-		defer mu.Unlock()
-
 		r.cacheStore(r.scanDirForPackage(root, dir))
 	}
 
-	gopathwalk.WalkSkip(roots, add, skip, gopathwalk.Options{Debug: r.env.Debug, ModulesEnabled: true})
-
-	// Everything we already had, and everything new, is now in the cache.
-	for _, dir := range r.cacheKeys() {
-		info, ok := r.cacheLoad(dir)
-		if !ok {
-			continue
+	// r.roots and the callback are not necessarily safe to use in the
+	// goroutine below. Process them eagerly.
+	roots := filterRoots(r.roots, callback.rootFound)
+	// We can't cancel walks, because we need them to finish to have a usable
+	// cache. Instead, run them in a separate goroutine and detach.
+	scanDone := make(chan struct{})
+	go func() {
+		select {
+		case <-ctx.Done():
+			return
+		case <-r.scanSema:
 		}
+		defer func() { r.scanSema <- struct{}{} }()
+		// We have the lock on r.scannedRoots, and no other scans can run.
+		for _, root := range roots {
+			if ctx.Err() != nil {
+				return
+			}
 
-		// Skip this directory if we were not able to get the package information successfully.
-		if scanned, err := info.reachedStatus(directoryScanned); !scanned || err != nil {
-			continue
-		}
-
-		// If we want package names, make sure the cache has them.
-		if loadNames {
-			var err error
-			if info, err = r.cachePackageName(info); err != nil {
+			if r.scannedRoots[root] {
 				continue
 			}
+			gopathwalk.WalkSkip([]gopathwalk.Root{root}, add, skip, gopathwalk.Options{Logf: r.env.Logf, ModulesEnabled: true})
+			r.scannedRoots[root] = true
 		}
-
-		res, err := r.canonicalize(info)
-		if err != nil {
-			continue
-		}
-		result = append(result, res)
+		close(scanDone)
+	}()
+	select {
+	case <-ctx.Done():
+	case <-scanDone:
 	}
+	return nil
+}
 
-	return result, nil
+func (r *ModuleResolver) scoreImportPath(ctx context.Context, path string) int {
+	if _, ok := stdlib[path]; ok {
+		return MaxRelevance
+	}
+	mod, _ := r.findPackage(path)
+	return modRelevance(mod)
+}
+
+func modRelevance(mod *gocommand.ModuleJSON) int {
+	switch {
+	case mod == nil: // out of scope
+		return MaxRelevance - 4
+	case mod.Indirect:
+		return MaxRelevance - 3
+	case !mod.Main:
+		return MaxRelevance - 2
+	default:
+		return MaxRelevance - 1 // main module ties with stdlib
+	}
 }
 
 // canonicalize gets the result of canonicalizing the packages using the results
@@ -428,15 +509,14 @@ func (r *ModuleResolver) canonicalize(info directoryPackageInfo) (*pkg, error) {
 			importPathShort: info.nonCanonicalImportPath,
 			dir:             info.dir,
 			packageName:     path.Base(info.nonCanonicalImportPath),
-			relevance:       0,
+			relevance:       MaxRelevance,
 		}, nil
 	}
 
 	importPath := info.nonCanonicalImportPath
-	relevance := 2
+	mod := r.findModuleByDir(info.dir)
 	// Check if the directory is underneath a module that's in scope.
-	if mod := r.findModuleByDir(info.dir); mod != nil {
-		relevance = 1
+	if mod != nil {
 		// It is. If dir is the target of a replace directive,
 		// our guessed import path is wrong. Use the real one.
 		if mod.Dir == info.dir {
@@ -445,15 +525,16 @@ func (r *ModuleResolver) canonicalize(info directoryPackageInfo) (*pkg, error) {
 			dirInMod := info.dir[len(mod.Dir)+len("/"):]
 			importPath = path.Join(mod.Path, filepath.ToSlash(dirInMod))
 		}
-	} else if info.needsReplace {
+	} else if !strings.HasPrefix(importPath, info.moduleName) {
+		// The module's name doesn't match the package's import path. It
+		// probably needs a replace directive we don't have.
 		return nil, fmt.Errorf("package in %q is not valid without a replace statement", info.dir)
 	}
 
 	res := &pkg{
 		importPathShort: importPath,
 		dir:             info.dir,
-		packageName:     info.packageName, // may not be populated if the caller didn't ask for it
-		relevance:       relevance,
+		relevance:       modRelevance(mod),
 	}
 	// We may have discovered a package that has a different version
 	// in scope already. Canonicalize to that one if possible.
@@ -463,14 +544,14 @@ func (r *ModuleResolver) canonicalize(info directoryPackageInfo) (*pkg, error) {
 	return res, nil
 }
 
-func (r *ModuleResolver) loadExports(ctx context.Context, pkg *pkg) (string, []string, error) {
+func (r *ModuleResolver) loadExports(ctx context.Context, pkg *pkg, includeTest bool) (string, []string, error) {
 	if err := r.init(); err != nil {
 		return "", nil, err
 	}
-	if info, ok := r.cacheLoad(pkg.dir); ok {
+	if info, ok := r.cacheLoad(pkg.dir); ok && !includeTest {
 		return r.cacheExports(ctx, r.env, info)
 	}
-	return loadExportsFromFiles(ctx, r.env, pkg.dir)
+	return loadExportsFromFiles(ctx, r.env, pkg.dir, includeTest)
 }
 
 func (r *ModuleResolver) scanDirForPackage(root gopathwalk.Root, dir string) directoryPackageInfo {
@@ -488,7 +569,7 @@ func (r *ModuleResolver) scanDirForPackage(root gopathwalk.Root, dir string) dir
 	}
 	switch root.Type {
 	case gopathwalk.RootCurrentModule:
-		importPath = path.Join(r.Main.Path, filepath.ToSlash(subdir))
+		importPath = path.Join(r.main.Path, filepath.ToSlash(subdir))
 	case gopathwalk.RootModuleCache:
 		matches := modCacheRegexp.FindStringSubmatch(subdir)
 		if len(matches) == 0 {
@@ -497,9 +578,9 @@ func (r *ModuleResolver) scanDirForPackage(root gopathwalk.Root, dir string) dir
 				err:    fmt.Errorf("invalid module cache path: %v", subdir),
 			}
 		}
-		modPath, err := module.DecodePath(filepath.ToSlash(matches[1]))
+		modPath, err := module.UnescapePath(filepath.ToSlash(matches[1]))
 		if err != nil {
-			if r.env.Debug {
+			if r.env.Logf != nil {
 				r.env.Logf("decoding module cache path %q: %v", subdir, err)
 			}
 			return directoryPackageInfo{
@@ -516,7 +597,6 @@ func (r *ModuleResolver) scanDirForPackage(root gopathwalk.Root, dir string) dir
 		dir:                    dir,
 		rootType:               root.Type,
 		nonCanonicalImportPath: importPath,
-		needsReplace:           false,
 		moduleDir:              modDir,
 		moduleName:             modName,
 	}
@@ -524,14 +604,6 @@ func (r *ModuleResolver) scanDirForPackage(root gopathwalk.Root, dir string) dir
 		// stdlib packages are always in scope, despite the confusing go.mod
 		return result
 	}
-	// Check that this package is not obviously impossible to import.
-	if !strings.HasPrefix(importPath, modName) {
-		// The module's declared path does not match
-		// its expected path. It probably needs a
-		// replace directive we don't have.
-		result.needsReplace = true
-	}
-
 	return result
 }
 
@@ -581,63 +653,3 @@ func modulePath(mod []byte) string {
 	}
 	return "" // missing module path
 }
-
-var modFlagRegexp = regexp.MustCompile(`-mod[ =](\w+)`)
-
-// vendorEnabled indicates if vendoring is enabled.
-// Inspired by setDefaultBuildMod in modload/init.go
-func vendorEnabled(env *ProcessEnv) (*ModuleJSON, bool, error) {
-	mainMod, go114, err := getMainModuleAnd114(env)
-	if err != nil {
-		return nil, false, err
-	}
-	matches := modFlagRegexp.FindStringSubmatch(env.GOFLAGS)
-	var modFlag string
-	if len(matches) != 0 {
-		modFlag = matches[1]
-	}
-	if modFlag != "" {
-		// Don't override an explicit '-mod=' argument.
-		return mainMod, modFlag == "vendor", nil
-	}
-	if mainMod == nil || !go114 {
-		return mainMod, false, nil
-	}
-	// Check 1.14's automatic vendor mode.
-	if fi, err := os.Stat(filepath.Join(mainMod.Dir, "vendor")); err == nil && fi.IsDir() {
-		if mainMod.GoVersion != "" && semver.Compare("v"+mainMod.GoVersion, "v1.14") >= 0 {
-			// The Go version is at least 1.14, and a vendor directory exists.
-			// Set -mod=vendor by default.
-			return mainMod, true, nil
-		}
-	}
-	return mainMod, false, nil
-}
-
-// getMainModuleAnd114 gets the main module's information and whether the
-// go command in use is 1.14+. This is the information needed to figure out
-// if vendoring should be enabled.
-func getMainModuleAnd114(env *ProcessEnv) (*ModuleJSON, bool, error) {
-	const format = `{{.Path}}
-{{.Dir}}
-{{.GoMod}}
-{{.GoVersion}}
-{{range context.ReleaseTags}}{{if eq . "go1.14"}}{{.}}{{end}}{{end}}
-`
-	stdout, err := env.invokeGo("list", "-m", "-f", format)
-	if err != nil {
-		return nil, false, nil
-	}
-	lines := strings.Split(stdout.String(), "\n")
-	if len(lines) < 5 {
-		return nil, false, fmt.Errorf("unexpected stdout: %q", stdout)
-	}
-	mod := &ModuleJSON{
-		Path:      lines[0],
-		Dir:       lines[1],
-		GoMod:     lines[2],
-		GoVersion: lines[3],
-		Main:      true,
-	}
-	return mod, lines[4] == "go1.14", nil
-}

vendor/golang.org/x/tools/internal/imports/mod_cache.go

@@ -49,10 +49,6 @@ type directoryPackageInfo struct {
 	// nonCanonicalImportPath is the package's expected import path. It may
 	// not actually be importable at that path.
 	nonCanonicalImportPath string
-	// needsReplace is true if the nonCanonicalImportPath does not match the
-	// module's declared path, making it impossible to import without a
-	// replace directive.
-	needsReplace bool
 
 	// Module-related information.
 	moduleDir  string // The directory that is the module root of this dir.
@@ -97,15 +93,86 @@ func (info *directoryPackageInfo) reachedStatus(target directoryPackageStatus) (
 type dirInfoCache struct {
 	mu sync.Mutex
 	// dirs stores information about packages in directories, keyed by absolute path.
-	dirs map[string]*directoryPackageInfo
+	dirs      map[string]*directoryPackageInfo
+	listeners map[*int]cacheListener
+}
+
+type cacheListener func(directoryPackageInfo)
+
+// ScanAndListen calls listener on all the items in the cache, and on anything
+// newly added. The returned stop function waits for all in-flight callbacks to
+// finish and blocks new ones.
+func (d *dirInfoCache) ScanAndListen(ctx context.Context, listener cacheListener) func() {
+	ctx, cancel := context.WithCancel(ctx)
+
+	// Flushing out all the callbacks is tricky without knowing how many there
+	// are going to be. Setting an arbitrary limit makes it much easier.
+	const maxInFlight = 10
+	sema := make(chan struct{}, maxInFlight)
+	for i := 0; i < maxInFlight; i++ {
+		sema <- struct{}{}
+	}
+
+	cookie := new(int) // A unique ID we can use for the listener.
+
+	// We can't hold mu while calling the listener.
+	d.mu.Lock()
+	var keys []string
+	for key := range d.dirs {
+		keys = append(keys, key)
+	}
+	d.listeners[cookie] = func(info directoryPackageInfo) {
+		select {
+		case <-ctx.Done():
+			return
+		case <-sema:
+		}
+		listener(info)
+		sema <- struct{}{}
+	}
+	d.mu.Unlock()
+
+	stop := func() {
+		cancel()
+		d.mu.Lock()
+		delete(d.listeners, cookie)
+		d.mu.Unlock()
+		for i := 0; i < maxInFlight; i++ {
+			<-sema
+		}
+	}
+
+	// Process the pre-existing keys.
+	for _, k := range keys {
+		select {
+		case <-ctx.Done():
+			return stop
+		default:
+		}
+		if v, ok := d.Load(k); ok {
+			listener(v)
+		}
+	}
+
+	return stop
 }
 
 // Store stores the package info for dir.
 func (d *dirInfoCache) Store(dir string, info directoryPackageInfo) {
 	d.mu.Lock()
-	defer d.mu.Unlock()
-	stored := info // defensive copy
-	d.dirs[dir] = &stored
+	_, old := d.dirs[dir]
+	d.dirs[dir] = &info
+	var listeners []cacheListener
+	for _, l := range d.listeners {
+		listeners = append(listeners, l)
+	}
+	d.mu.Unlock()
+
+	if !old {
+		for _, l := range listeners {
+			l(info)
+		}
+	}
 }
 
 // Load returns a copy of the directoryPackageInfo for absolute directory dir.
@@ -129,17 +196,17 @@ func (d *dirInfoCache) Keys() (keys []string) {
 	return keys
 }
 
-func (d *dirInfoCache) CachePackageName(info directoryPackageInfo) (directoryPackageInfo, error) {
+func (d *dirInfoCache) CachePackageName(info directoryPackageInfo) (string, error) {
 	if loaded, err := info.reachedStatus(nameLoaded); loaded {
-		return info, err
+		return info.packageName, err
 	}
 	if scanned, err := info.reachedStatus(directoryScanned); !scanned || err != nil {
-		return info, fmt.Errorf("cannot read package name, scan error: %v", err)
+		return "", fmt.Errorf("cannot read package name, scan error: %v", err)
 	}
 	info.packageName, info.err = packageDirToName(info.dir)
 	info.status = nameLoaded
 	d.Store(info.dir, info)
-	return info, info.err
+	return info.packageName, info.err
 }
 
 func (d *dirInfoCache) CacheExports(ctx context.Context, env *ProcessEnv, info directoryPackageInfo) (string, []string, error) {
@@ -149,8 +216,8 @@ func (d *dirInfoCache) CacheExports(ctx context.Context, env *ProcessEnv, info d
 	if reached, err := info.reachedStatus(nameLoaded); reached && err != nil {
 		return "", nil, err
 	}
-	info.packageName, info.exports, info.err = loadExportsFromFiles(ctx, env, info.dir)
-	if info.err == context.Canceled {
+	info.packageName, info.exports, info.err = loadExportsFromFiles(ctx, env, info.dir, false)
+	if info.err == context.Canceled || info.err == context.DeadlineExceeded {
 		return info.packageName, info.exports, info.err
 	}
 	// The cache structure wants things to proceed linearly. We can skip a

vendor/golang.org/x/tools/internal/imports/zstdlib.go

@@ -415,6 +415,9 @@ var stdlib = map[string][]string{
 	"crypto/tls": []string{
 		"Certificate",
 		"CertificateRequestInfo",
+		"CipherSuite",
+		"CipherSuiteName",
+		"CipherSuites",
 		"Client",
 		"ClientAuthType",
 		"ClientHelloInfo",
@@ -434,6 +437,7 @@ var stdlib = map[string][]string{
 		"ECDSAWithP521AndSHA512",
 		"ECDSAWithSHA1",
 		"Ed25519",
+		"InsecureCipherSuites",
 		"Listen",
 		"LoadX509KeyPair",
 		"NewLRUClientSessionCache",
@@ -465,6 +469,7 @@ var stdlib = map[string][]string{
 		"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
 		"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
 		"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
+		"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256",
 		"TLS_ECDHE_ECDSA_WITH_RC4_128_SHA",
 		"TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
 		"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
@@ -473,6 +478,7 @@ var stdlib = map[string][]string{
 		"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
 		"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
 		"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305",
+		"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256",
 		"TLS_ECDHE_RSA_WITH_RC4_128_SHA",
 		"TLS_FALLBACK_SCSV",
 		"TLS_RSA_WITH_3DES_EDE_CBC_SHA",
@@ -698,36 +704,65 @@ var stdlib = map[string][]string{
 		"Attr",
 		"AttrAbstractOrigin",
 		"AttrAccessibility",
+		"AttrAddrBase",
 		"AttrAddrClass",
+		"AttrAlignment",
 		"AttrAllocated",
 		"AttrArtificial",
 		"AttrAssociated",
 		"AttrBaseTypes",
+		"AttrBinaryScale",
 		"AttrBitOffset",
 		"AttrBitSize",
 		"AttrByteSize",
+		"AttrCallAllCalls",
+		"AttrCallAllSourceCalls",
+		"AttrCallAllTailCalls",
 		"AttrCallColumn",
+		"AttrCallDataLocation",
+		"AttrCallDataValue",
 		"AttrCallFile",
 		"AttrCallLine",
+		"AttrCallOrigin",
+		"AttrCallPC",
+		"AttrCallParameter",
+		"AttrCallReturnPC",
+		"AttrCallTailCall",
+		"AttrCallTarget",
+		"AttrCallTargetClobbered",
+		"AttrCallValue",
 		"AttrCalling",
 		"AttrCommonRef",
 		"AttrCompDir",
+		"AttrConstExpr",
 		"AttrConstValue",
 		"AttrContainingType",
 		"AttrCount",
+		"AttrDataBitOffset",
 		"AttrDataLocation",
 		"AttrDataMemberLoc",
+		"AttrDecimalScale",
+		"AttrDecimalSign",
 		"AttrDeclColumn",
 		"AttrDeclFile",
 		"AttrDeclLine",
 		"AttrDeclaration",
 		"AttrDefaultValue",
+		"AttrDefaulted",
+		"AttrDeleted",
 		"AttrDescription",
+		"AttrDigitCount",
 		"AttrDiscr",
 		"AttrDiscrList",
 		"AttrDiscrValue",
+		"AttrDwoName",
+		"AttrElemental",
 		"AttrEncoding",
+		"AttrEndianity",
 		"AttrEntrypc",
+		"AttrEnumClass",
+		"AttrExplicit",
+		"AttrExportSymbols",
 		"AttrExtension",
 		"AttrExternal",
 		"AttrFrameBase",
@@ -738,27 +773,47 @@ var stdlib = map[string][]string{
 		"AttrInline",
 		"AttrIsOptional",
 		"AttrLanguage",
+		"AttrLinkageName",
 		"AttrLocation",
+		"AttrLoclistsBase",
 		"AttrLowerBound",
 		"AttrLowpc",
 		"AttrMacroInfo",
+		"AttrMacros",
+		"AttrMainSubprogram",
+		"AttrMutable",
 		"AttrName",
 		"AttrNamelistItem",
+		"AttrNoreturn",
+		"AttrObjectPointer",
 		"AttrOrdering",
+		"AttrPictureString",
 		"AttrPriority",
 		"AttrProducer",
 		"AttrPrototyped",
+		"AttrPure",
 		"AttrRanges",
+		"AttrRank",
+		"AttrRecursive",
+		"AttrReference",
 		"AttrReturnAddr",
+		"AttrRnglistsBase",
+		"AttrRvalueReference",
 		"AttrSegment",
 		"AttrSibling",
+		"AttrSignature",
+		"AttrSmall",
 		"AttrSpecification",
 		"AttrStartScope",
 		"AttrStaticLink",
 		"AttrStmtList",
+		"AttrStrOffsetsBase",
 		"AttrStride",
 		"AttrStrideSize",
 		"AttrStringLength",
+		"AttrStringLengthBitSize",
+		"AttrStringLengthByteSize",
+		"AttrThreadsScaled",
 		"AttrTrampoline",
 		"AttrType",
 		"AttrUpperBound",
@@ -772,18 +827,23 @@ var stdlib = map[string][]string{
 		"BoolType",
 		"CharType",
 		"Class",
+		"ClassAddrPtr",
 		"ClassAddress",
 		"ClassBlock",
 		"ClassConstant",
 		"ClassExprLoc",
 		"ClassFlag",
 		"ClassLinePtr",
+		"ClassLocList",
 		"ClassLocListPtr",
 		"ClassMacPtr",
 		"ClassRangeListPtr",
 		"ClassReference",
 		"ClassReferenceAlt",
 		"ClassReferenceSig",
+		"ClassRngList",
+		"ClassRngListsPtr",
+		"ClassStrOffsetsPtr",
 		"ClassString",
 		"ClassStringAlt",
 		"ClassUnknown",
@@ -814,9 +874,13 @@ var stdlib = map[string][]string{
 		"Tag",
 		"TagAccessDeclaration",
 		"TagArrayType",
+		"TagAtomicType",
 		"TagBaseType",
+		"TagCallSite",
+		"TagCallSiteParameter",
 		"TagCatchDwarfBlock",
 		"TagClassType",
+		"TagCoarrayType",
 		"TagCommonDwarfBlock",
 		"TagCommonInclusion",
 		"TagCompileUnit",
@@ -824,12 +888,15 @@ var stdlib = map[string][]string{
 		"TagConstType",
 		"TagConstant",
 		"TagDwarfProcedure",
+		"TagDynamicType",
 		"TagEntryPoint",
 		"TagEnumerationType",
 		"TagEnumerator",
 		"TagFileType",
 		"TagFormalParameter",
 		"TagFriend",
+		"TagGenericSubrange",
+		"TagImmutableType",
 		"TagImportedDeclaration",
 		"TagImportedModule",
 		"TagImportedUnit",
@@ -853,6 +920,7 @@ var stdlib = map[string][]string{
 		"TagRvalueReferenceType",
 		"TagSetType",
 		"TagSharedType",
+		"TagSkeletonUnit",
 		"TagStringType",
 		"TagStructType",
 		"TagSubprogram",
@@ -2359,6 +2427,7 @@ var stdlib = map[string][]string{
 		"RawValue",
 		"StructuralError",
 		"SyntaxError",
+		"TagBMPString",
 		"TagBitString",
 		"TagBoolean",
 		"TagEnum",
@@ -2787,6 +2856,7 @@ var stdlib = map[string][]string{
 		"IsPredeclared",
 		"Mode",
 		"New",
+		"NewFromFiles",
 		"Note",
 		"Package",
 		"PreserveAST",
@@ -3115,6 +3185,11 @@ var stdlib = map[string][]string{
 		"New64",
 		"New64a",
 	},
+	"hash/maphash": []string{
+		"Hash",
+		"MakeSeed",
+		"Seed",
+	},
 	"html": []string{
 		"EscapeString",
 		"UnescapeString",
@@ -3367,6 +3442,7 @@ var stdlib = map[string][]string{
 		"Ldate",
 		"Llongfile",
 		"Lmicroseconds",
+		"Lmsgprefix",
 		"Logger",
 		"Lshortfile",
 		"LstdFlags",
@@ -3443,6 +3519,7 @@ var stdlib = map[string][]string{
 		"Exp",
 		"Exp2",
 		"Expm1",
+		"FMA",
 		"Float32bits",
 		"Float32frombits",
 		"Float64bits",
@@ -3567,6 +3644,9 @@ var stdlib = map[string][]string{
 		"OnesCount32",
 		"OnesCount64",
 		"OnesCount8",
+		"Rem",
+		"Rem32",
+		"Rem64",
 		"Reverse",
 		"Reverse16",
 		"Reverse32",
@@ -5140,7 +5220,10 @@ var stdlib = map[string][]string{
 		"CTL_NET",
 		"CTL_QUERY",
 		"CTRL_BREAK_EVENT",
+		"CTRL_CLOSE_EVENT",
 		"CTRL_C_EVENT",
+		"CTRL_LOGOFF_EVENT",
+		"CTRL_SHUTDOWN_EVENT",
 		"CancelIo",
 		"CancelIoEx",
 		"CertAddCertificateContextToStore",
@@ -10112,6 +10195,7 @@ var stdlib = map[string][]string{
 		"Duployan",
 		"Egyptian_Hieroglyphs",
 		"Elbasan",
+		"Elymaic",
 		"Ethiopic",
 		"Extender",
 		"FoldCategory",
@@ -10215,6 +10299,7 @@ var stdlib = map[string][]string{
 		"Myanmar",
 		"N",
 		"Nabataean",
+		"Nandinagari",
 		"Nd",
 		"New_Tai_Lue",
 		"Newa",
@@ -10224,6 +10309,7 @@ var stdlib = map[string][]string{
 		"Noncharacter_Code_Point",
 		"Number",
 		"Nushu",
+		"Nyiakeng_Puachue_Hmong",
 		"Ogham",
 		"Ol_Chiki",
 		"Old_Hungarian",
@@ -10331,6 +10417,7 @@ var stdlib = map[string][]string{
 		"Vai",
 		"Variation_Selector",
 		"Version",
+		"Wancho",
 		"Warang_Citi",
 		"White_Space",
 		"Yi",

vendor/golang.org/x/tools/internal/module/module.go

@@ -1,540 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package module defines the module.Version type
-// along with support code.
-package module
-
-// IMPORTANT NOTE
-//
-// This file essentially defines the set of valid import paths for the go command.
-// There are many subtle considerations, including Unicode ambiguity,
-// security, network, and file system representations.
-//
-// This file also defines the set of valid module path and version combinations,
-// another topic with many subtle considerations.
-//
-// Changes to the semantics in this file require approval from rsc.
-
-import (
-	"fmt"
-	"sort"
-	"strings"
-	"unicode"
-	"unicode/utf8"
-
-	"golang.org/x/tools/internal/semver"
-)
-
-// A Version is defined by a module path and version pair.
-type Version struct {
-	Path string
-
-	// Version is usually a semantic version in canonical form.
-	// There are two exceptions to this general rule.
-	// First, the top-level target of a build has no specific version
-	// and uses Version = "".
-	// Second, during MVS calculations the version "none" is used
-	// to represent the decision to take no version of a given module.
-	Version string `json:",omitempty"`
-}
-
-// Check checks that a given module path, version pair is valid.
-// In addition to the path being a valid module path
-// and the version being a valid semantic version,
-// the two must correspond.
-// For example, the path "yaml/v2" only corresponds to
-// semantic versions beginning with "v2.".
-func Check(path, version string) error {
-	if err := CheckPath(path); err != nil {
-		return err
-	}
-	if !semver.IsValid(version) {
-		return fmt.Errorf("malformed semantic version %v", version)
-	}
-	_, pathMajor, _ := SplitPathVersion(path)
-	if !MatchPathMajor(version, pathMajor) {
-		if pathMajor == "" {
-			pathMajor = "v0 or v1"
-		}
-		if pathMajor[0] == '.' { // .v1
-			pathMajor = pathMajor[1:]
-		}
-		return fmt.Errorf("mismatched module path %v and version %v (want %v)", path, version, pathMajor)
-	}
-	return nil
-}
-
-// firstPathOK reports whether r can appear in the first element of a module path.
-// The first element of the path must be an LDH domain name, at least for now.
-// To avoid case ambiguity, the domain name must be entirely lower case.
-func firstPathOK(r rune) bool {
-	return r == '-' || r == '.' ||
-		'0' <= r && r <= '9' ||
-		'a' <= r && r <= 'z'
-}
-
-// pathOK reports whether r can appear in an import path element.
-// Paths can be ASCII letters, ASCII digits, and limited ASCII punctuation: + - . _ and ~.
-// This matches what "go get" has historically recognized in import paths.
-// TODO(rsc): We would like to allow Unicode letters, but that requires additional
-// care in the safe encoding (see note below).
-func pathOK(r rune) bool {
-	if r < utf8.RuneSelf {
-		return r == '+' || r == '-' || r == '.' || r == '_' || r == '~' ||
-			'0' <= r && r <= '9' ||
-			'A' <= r && r <= 'Z' ||
-			'a' <= r && r <= 'z'
-	}
-	return false
-}
-
-// fileNameOK reports whether r can appear in a file name.
-// For now we allow all Unicode letters but otherwise limit to pathOK plus a few more punctuation characters.
-// If we expand the set of allowed characters here, we have to
-// work harder at detecting potential case-folding and normalization collisions.
-// See note about "safe encoding" below.
-func fileNameOK(r rune) bool {
-	if r < utf8.RuneSelf {
-		// Entire set of ASCII punctuation, from which we remove characters:
-		//     ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ \ ] ^ _ ` { | } ~
-		// We disallow some shell special characters: " ' * < > ? ` |
-		// (Note that some of those are disallowed by the Windows file system as well.)
-		// We also disallow path separators / : and \ (fileNameOK is only called on path element characters).
-		// We allow spaces (U+0020) in file names.
-		const allowed = "!#$%&()+,-.=@[]^_{}~ "
-		if '0' <= r && r <= '9' || 'A' <= r && r <= 'Z' || 'a' <= r && r <= 'z' {
-			return true
-		}
-		for i := 0; i < len(allowed); i++ {
-			if rune(allowed[i]) == r {
-				return true
-			}
-		}
-		return false
-	}
-	// It may be OK to add more ASCII punctuation here, but only carefully.
-	// For example Windows disallows < > \, and macOS disallows :, so we must not allow those.
-	return unicode.IsLetter(r)
-}
-
-// CheckPath checks that a module path is valid.
-func CheckPath(path string) error {
-	if err := checkPath(path, false); err != nil {
-		return fmt.Errorf("malformed module path %q: %v", path, err)
-	}
-	i := strings.Index(path, "/")
-	if i < 0 {
-		i = len(path)
-	}
-	if i == 0 {
-		return fmt.Errorf("malformed module path %q: leading slash", path)
-	}
-	if !strings.Contains(path[:i], ".") {
-		return fmt.Errorf("malformed module path %q: missing dot in first path element", path)
-	}
-	if path[0] == '-' {
-		return fmt.Errorf("malformed module path %q: leading dash in first path element", path)
-	}
-	for _, r := range path[:i] {
-		if !firstPathOK(r) {
-			return fmt.Errorf("malformed module path %q: invalid char %q in first path element", path, r)
-		}
-	}
-	if _, _, ok := SplitPathVersion(path); !ok {
-		return fmt.Errorf("malformed module path %q: invalid version", path)
-	}
-	return nil
-}
-
-// CheckImportPath checks that an import path is valid.
-func CheckImportPath(path string) error {
-	if err := checkPath(path, false); err != nil {
-		return fmt.Errorf("malformed import path %q: %v", path, err)
-	}
-	return nil
-}
-
-// checkPath checks that a general path is valid.
-// It returns an error describing why but not mentioning path.
-// Because these checks apply to both module paths and import paths,
-// the caller is expected to add the "malformed ___ path %q: " prefix.
-// fileName indicates whether the final element of the path is a file name
-// (as opposed to a directory name).
-func checkPath(path string, fileName bool) error {
-	if !utf8.ValidString(path) {
-		return fmt.Errorf("invalid UTF-8")
-	}
-	if path == "" {
-		return fmt.Errorf("empty string")
-	}
-	if strings.Contains(path, "..") {
-		return fmt.Errorf("double dot")
-	}
-	if strings.Contains(path, "//") {
-		return fmt.Errorf("double slash")
-	}
-	if path[len(path)-1] == '/' {
-		return fmt.Errorf("trailing slash")
-	}
-	elemStart := 0
-	for i, r := range path {
-		if r == '/' {
-			if err := checkElem(path[elemStart:i], fileName); err != nil {
-				return err
-			}
-			elemStart = i + 1
-		}
-	}
-	if err := checkElem(path[elemStart:], fileName); err != nil {
-		return err
-	}
-	return nil
-}
-
-// checkElem checks whether an individual path element is valid.
-// fileName indicates whether the element is a file name (not a directory name).
-func checkElem(elem string, fileName bool) error {
-	if elem == "" {
-		return fmt.Errorf("empty path element")
-	}
-	if strings.Count(elem, ".") == len(elem) {
-		return fmt.Errorf("invalid path element %q", elem)
-	}
-	if elem[0] == '.' && !fileName {
-		return fmt.Errorf("leading dot in path element")
-	}
-	if elem[len(elem)-1] == '.' {
-		return fmt.Errorf("trailing dot in path element")
-	}
-	charOK := pathOK
-	if fileName {
-		charOK = fileNameOK
-	}
-	for _, r := range elem {
-		if !charOK(r) {
-			return fmt.Errorf("invalid char %q", r)
-		}
-	}
-
-	// Windows disallows a bunch of path elements, sadly.
-	// See https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
-	short := elem
-	if i := strings.Index(short, "."); i >= 0 {
-		short = short[:i]
-	}
-	for _, bad := range badWindowsNames {
-		if strings.EqualFold(bad, short) {
-			return fmt.Errorf("disallowed path element %q", elem)
-		}
-	}
-	return nil
-}
-
-// CheckFilePath checks whether a slash-separated file path is valid.
-func CheckFilePath(path string) error {
-	if err := checkPath(path, true); err != nil {
-		return fmt.Errorf("malformed file path %q: %v", path, err)
-	}
-	return nil
-}
-
-// badWindowsNames are the reserved file path elements on Windows.
-// See https://docs.microsoft.com/en-us/windows/desktop/fileio/naming-a-file
-var badWindowsNames = []string{
-	"CON",
-	"PRN",
-	"AUX",
-	"NUL",
-	"COM1",
-	"COM2",
-	"COM3",
-	"COM4",
-	"COM5",
-	"COM6",
-	"COM7",
-	"COM8",
-	"COM9",
-	"LPT1",
-	"LPT2",
-	"LPT3",
-	"LPT4",
-	"LPT5",
-	"LPT6",
-	"LPT7",
-	"LPT8",
-	"LPT9",
-}
-
-// SplitPathVersion returns prefix and major version such that prefix+pathMajor == path
-// and version is either empty or "/vN" for N >= 2.
-// As a special case, gopkg.in paths are recognized directly;
-// they require ".vN" instead of "/vN", and for all N, not just N >= 2.
-func SplitPathVersion(path string) (prefix, pathMajor string, ok bool) {
-	if strings.HasPrefix(path, "gopkg.in/") {
-		return splitGopkgIn(path)
-	}
-
-	i := len(path)
-	dot := false
-	for i > 0 && ('0' <= path[i-1] && path[i-1] <= '9' || path[i-1] == '.') {
-		if path[i-1] == '.' {
-			dot = true
-		}
-		i--
-	}
-	if i <= 1 || i == len(path) || path[i-1] != 'v' || path[i-2] != '/' {
-		return path, "", true
-	}
-	prefix, pathMajor = path[:i-2], path[i-2:]
-	if dot || len(pathMajor) <= 2 || pathMajor[2] == '0' || pathMajor == "/v1" {
-		return path, "", false
-	}
-	return prefix, pathMajor, true
-}
-
-// splitGopkgIn is like SplitPathVersion but only for gopkg.in paths.
-func splitGopkgIn(path string) (prefix, pathMajor string, ok bool) {
-	if !strings.HasPrefix(path, "gopkg.in/") {
-		return path, "", false
-	}
-	i := len(path)
-	if strings.HasSuffix(path, "-unstable") {
-		i -= len("-unstable")
-	}
-	for i > 0 && ('0' <= path[i-1] && path[i-1] <= '9') {
-		i--
-	}
-	if i <= 1 || path[i-1] != 'v' || path[i-2] != '.' {
-		// All gopkg.in paths must end in vN for some N.
-		return path, "", false
-	}
-	prefix, pathMajor = path[:i-2], path[i-2:]
-	if len(pathMajor) <= 2 || pathMajor[2] == '0' && pathMajor != ".v0" {
-		return path, "", false
-	}
-	return prefix, pathMajor, true
-}
-
-// MatchPathMajor reports whether the semantic version v
-// matches the path major version pathMajor.
-func MatchPathMajor(v, pathMajor string) bool {
-	if strings.HasPrefix(pathMajor, ".v") && strings.HasSuffix(pathMajor, "-unstable") {
-		pathMajor = strings.TrimSuffix(pathMajor, "-unstable")
-	}
-	if strings.HasPrefix(v, "v0.0.0-") && pathMajor == ".v1" {
-		// Allow old bug in pseudo-versions that generated v0.0.0- pseudoversion for gopkg .v1.
-		// For example, gopkg.in/yaml.v2@v2.2.1's go.mod requires gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405.
-		return true
-	}
-	m := semver.Major(v)
-	if pathMajor == "" {
-		return m == "v0" || m == "v1" || semver.Build(v) == "+incompatible"
-	}
-	return (pathMajor[0] == '/' || pathMajor[0] == '.') && m == pathMajor[1:]
-}
-
-// CanonicalVersion returns the canonical form of the version string v.
-// It is the same as semver.Canonical(v) except that it preserves the special build suffix "+incompatible".
-func CanonicalVersion(v string) string {
-	cv := semver.Canonical(v)
-	if semver.Build(v) == "+incompatible" {
-		cv += "+incompatible"
-	}
-	return cv
-}
-
-// Sort sorts the list by Path, breaking ties by comparing Versions.
-func Sort(list []Version) {
-	sort.Slice(list, func(i, j int) bool {
-		mi := list[i]
-		mj := list[j]
-		if mi.Path != mj.Path {
-			return mi.Path < mj.Path
-		}
-		// To help go.sum formatting, allow version/file.
-		// Compare semver prefix by semver rules,
-		// file by string order.
-		vi := mi.Version
-		vj := mj.Version
-		var fi, fj string
-		if k := strings.Index(vi, "/"); k >= 0 {
-			vi, fi = vi[:k], vi[k:]
-		}
-		if k := strings.Index(vj, "/"); k >= 0 {
-			vj, fj = vj[:k], vj[k:]
-		}
-		if vi != vj {
-			return semver.Compare(vi, vj) < 0
-		}
-		return fi < fj
-	})
-}
-
-// Safe encodings
-//
-// Module paths appear as substrings of file system paths
-// (in the download cache) and of web server URLs in the proxy protocol.
-// In general we cannot rely on file systems to be case-sensitive,
-// nor can we rely on web servers, since they read from file systems.
-// That is, we cannot rely on the file system to keep rsc.io/QUOTE
-// and rsc.io/quote separate. Windows and macOS don't.
-// Instead, we must never require two different casings of a file path.
-// Because we want the download cache to match the proxy protocol,
-// and because we want the proxy protocol to be possible to serve
-// from a tree of static files (which might be stored on a case-insensitive
-// file system), the proxy protocol must never require two different casings
-// of a URL path either.
-//
-// One possibility would be to make the safe encoding be the lowercase
-// hexadecimal encoding of the actual path bytes. This would avoid ever
-// needing different casings of a file path, but it would be fairly illegible
-// to most programmers when those paths appeared in the file system
-// (including in file paths in compiler errors and stack traces)
-// in web server logs, and so on. Instead, we want a safe encoding that
-// leaves most paths unaltered.
-//
-// The safe encoding is this:
-// replace every uppercase letter with an exclamation mark
-// followed by the letter's lowercase equivalent.
-//
-// For example,
-// github.com/Azure/azure-sdk-for-go ->  github.com/!azure/azure-sdk-for-go.
-// github.com/GoogleCloudPlatform/cloudsql-proxy -> github.com/!google!cloud!platform/cloudsql-proxy
-// github.com/Sirupsen/logrus -> github.com/!sirupsen/logrus.
-//
-// Import paths that avoid upper-case letters are left unchanged.
-// Note that because import paths are ASCII-only and avoid various
-// problematic punctuation (like : < and >), the safe encoding is also ASCII-only
-// and avoids the same problematic punctuation.
-//
-// Import paths have never allowed exclamation marks, so there is no
-// need to define how to encode a literal !.
-//
-// Although paths are disallowed from using Unicode (see pathOK above),
-// the eventual plan is to allow Unicode letters as well, to assume that
-// file systems and URLs are Unicode-safe (storing UTF-8), and apply
-// the !-for-uppercase convention. Note however that not all runes that
-// are different but case-fold equivalent are an upper/lower pair.
-// For example, U+004B ('K'), U+006B ('k'), and U+212A ('K' for Kelvin)
-// are considered to case-fold to each other. When we do add Unicode
-// letters, we must not assume that upper/lower are the only case-equivalent pairs.
-// Perhaps the Kelvin symbol would be disallowed entirely, for example.
-// Or perhaps it would encode as "!!k", or perhaps as "(212A)".
-//
-// Also, it would be nice to allow Unicode marks as well as letters,
-// but marks include combining marks, and then we must deal not
-// only with case folding but also normalization: both U+00E9 ('é')
-// and U+0065 U+0301 ('e' followed by combining acute accent)
-// look the same on the page and are treated by some file systems
-// as the same path. If we do allow Unicode marks in paths, there
-// must be some kind of normalization to allow only one canonical
-// encoding of any character used in an import path.
-
-// EncodePath returns the safe encoding of the given module path.
-// It fails if the module path is invalid.
-func EncodePath(path string) (encoding string, err error) {
-	if err := CheckPath(path); err != nil {
-		return "", err
-	}
-
-	return encodeString(path)
-}
-
-// EncodeVersion returns the safe encoding of the given module version.
-// Versions are allowed to be in non-semver form but must be valid file names
-// and not contain exclamation marks.
-func EncodeVersion(v string) (encoding string, err error) {
-	if err := checkElem(v, true); err != nil || strings.Contains(v, "!") {
-		return "", fmt.Errorf("disallowed version string %q", v)
-	}
-	return encodeString(v)
-}
-
-func encodeString(s string) (encoding string, err error) {
-	haveUpper := false
-	for _, r := range s {
-		if r == '!' || r >= utf8.RuneSelf {
-			// This should be disallowed by CheckPath, but diagnose anyway.
-			// The correctness of the encoding loop below depends on it.
-			return "", fmt.Errorf("internal error: inconsistency in EncodePath")
-		}
-		if 'A' <= r && r <= 'Z' {
-			haveUpper = true
-		}
-	}
-
-	if !haveUpper {
-		return s, nil
-	}
-
-	var buf []byte
-	for _, r := range s {
-		if 'A' <= r && r <= 'Z' {
-			buf = append(buf, '!', byte(r+'a'-'A'))
-		} else {
-			buf = append(buf, byte(r))
-		}
-	}
-	return string(buf), nil
-}
-
-// DecodePath returns the module path of the given safe encoding.
-// It fails if the encoding is invalid or encodes an invalid path.
-func DecodePath(encoding string) (path string, err error) {
-	path, ok := decodeString(encoding)
-	if !ok {
-		return "", fmt.Errorf("invalid module path encoding %q", encoding)
-	}
-	if err := CheckPath(path); err != nil {
-		return "", fmt.Errorf("invalid module path encoding %q: %v", encoding, err)
-	}
-	return path, nil
-}
-
-// DecodeVersion returns the version string for the given safe encoding.
-// It fails if the encoding is invalid or encodes an invalid version.
-// Versions are allowed to be in non-semver form but must be valid file names
-// and not contain exclamation marks.
-func DecodeVersion(encoding string) (v string, err error) {
-	v, ok := decodeString(encoding)
-	if !ok {
-		return "", fmt.Errorf("invalid version encoding %q", encoding)
-	}
-	if err := checkElem(v, true); err != nil {
-		return "", fmt.Errorf("disallowed version string %q", v)
-	}
-	return v, nil
-}
-
-func decodeString(encoding string) (string, bool) {
-	var buf []byte
-
-	bang := false
-	for _, r := range encoding {
-		if r >= utf8.RuneSelf {
-			return "", false
-		}
-		if bang {
-			bang = false
-			if r < 'a' || 'z' < r {
-				return "", false
-			}
-			buf = append(buf, byte(r+'A'-'a'))
-			continue
-		}
-		if r == '!' {
-			bang = true
-			continue
-		}
-		if 'A' <= r && r <= 'Z' {
-			return "", false
-		}
-		buf = append(buf, byte(r))
-	}
-	if bang {
-		return "", false
-	}
-	return string(buf), true
-}

vendor/golang.org/x/tools/internal/semver/semver.go

@@ -1,388 +0,0 @@
-// Copyright 2018 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package semver implements comparison of semantic version strings.
-// In this package, semantic version strings must begin with a leading "v",
-// as in "v1.0.0".
-//
-// The general form of a semantic version string accepted by this package is
-//
-//	vMAJOR[.MINOR[.PATCH[-PRERELEASE][+BUILD]]]
-//
-// where square brackets indicate optional parts of the syntax;
-// MAJOR, MINOR, and PATCH are decimal integers without extra leading zeros;
-// PRERELEASE and BUILD are each a series of non-empty dot-separated identifiers
-// using only alphanumeric characters and hyphens; and
-// all-numeric PRERELEASE identifiers must not have leading zeros.
-//
-// This package follows Semantic Versioning 2.0.0 (see semver.org)
-// with two exceptions. First, it requires the "v" prefix. Second, it recognizes
-// vMAJOR and vMAJOR.MINOR (with no prerelease or build suffixes)
-// as shorthands for vMAJOR.0.0 and vMAJOR.MINOR.0.
-package semver
-
-// parsed returns the parsed form of a semantic version string.
-type parsed struct {
-	major      string
-	minor      string
-	patch      string
-	short      string
-	prerelease string
-	build      string
-	err        string
-}
-
-// IsValid reports whether v is a valid semantic version string.
-func IsValid(v string) bool {
-	_, ok := parse(v)
-	return ok
-}
-
-// Canonical returns the canonical formatting of the semantic version v.
-// It fills in any missing .MINOR or .PATCH and discards build metadata.
-// Two semantic versions compare equal only if their canonical formattings
-// are identical strings.
-// The canonical invalid semantic version is the empty string.
-func Canonical(v string) string {
-	p, ok := parse(v)
-	if !ok {
-		return ""
-	}
-	if p.build != "" {
-		return v[:len(v)-len(p.build)]
-	}
-	if p.short != "" {
-		return v + p.short
-	}
-	return v
-}
-
-// Major returns the major version prefix of the semantic version v.
-// For example, Major("v2.1.0") == "v2".
-// If v is an invalid semantic version string, Major returns the empty string.
-func Major(v string) string {
-	pv, ok := parse(v)
-	if !ok {
-		return ""
-	}
-	return v[:1+len(pv.major)]
-}
-
-// MajorMinor returns the major.minor version prefix of the semantic version v.
-// For example, MajorMinor("v2.1.0") == "v2.1".
-// If v is an invalid semantic version string, MajorMinor returns the empty string.
-func MajorMinor(v string) string {
-	pv, ok := parse(v)
-	if !ok {
-		return ""
-	}
-	i := 1 + len(pv.major)
-	if j := i + 1 + len(pv.minor); j <= len(v) && v[i] == '.' && v[i+1:j] == pv.minor {
-		return v[:j]
-	}
-	return v[:i] + "." + pv.minor
-}
-
-// Prerelease returns the prerelease suffix of the semantic version v.
-// For example, Prerelease("v2.1.0-pre+meta") == "-pre".
-// If v is an invalid semantic version string, Prerelease returns the empty string.
-func Prerelease(v string) string {
-	pv, ok := parse(v)
-	if !ok {
-		return ""
-	}
-	return pv.prerelease
-}
-
-// Build returns the build suffix of the semantic version v.
-// For example, Build("v2.1.0+meta") == "+meta".
-// If v is an invalid semantic version string, Build returns the empty string.
-func Build(v string) string {
-	pv, ok := parse(v)
-	if !ok {
-		return ""
-	}
-	return pv.build
-}
-
-// Compare returns an integer comparing two versions according to
-// according to semantic version precedence.
-// The result will be 0 if v == w, -1 if v < w, or +1 if v > w.
-//
-// An invalid semantic version string is considered less than a valid one.
-// All invalid semantic version strings compare equal to each other.
-func Compare(v, w string) int {
-	pv, ok1 := parse(v)
-	pw, ok2 := parse(w)
-	if !ok1 && !ok2 {
-		return 0
-	}
-	if !ok1 {
-		return -1
-	}
-	if !ok2 {
-		return +1
-	}
-	if c := compareInt(pv.major, pw.major); c != 0 {
-		return c
-	}
-	if c := compareInt(pv.minor, pw.minor); c != 0 {
-		return c
-	}
-	if c := compareInt(pv.patch, pw.patch); c != 0 {
-		return c
-	}
-	return comparePrerelease(pv.prerelease, pw.prerelease)
-}
-
-// Max canonicalizes its arguments and then returns the version string
-// that compares greater.
-func Max(v, w string) string {
-	v = Canonical(v)
-	w = Canonical(w)
-	if Compare(v, w) > 0 {
-		return v
-	}
-	return w
-}
-
-func parse(v string) (p parsed, ok bool) {
-	if v == "" || v[0] != 'v' {
-		p.err = "missing v prefix"
-		return
-	}
-	p.major, v, ok = parseInt(v[1:])
-	if !ok {
-		p.err = "bad major version"
-		return
-	}
-	if v == "" {
-		p.minor = "0"
-		p.patch = "0"
-		p.short = ".0.0"
-		return
-	}
-	if v[0] != '.' {
-		p.err = "bad minor prefix"
-		ok = false
-		return
-	}
-	p.minor, v, ok = parseInt(v[1:])
-	if !ok {
-		p.err = "bad minor version"
-		return
-	}
-	if v == "" {
-		p.patch = "0"
-		p.short = ".0"
-		return
-	}
-	if v[0] != '.' {
-		p.err = "bad patch prefix"
-		ok = false
-		return
-	}
-	p.patch, v, ok = parseInt(v[1:])
-	if !ok {
-		p.err = "bad patch version"
-		return
-	}
-	if len(v) > 0 && v[0] == '-' {
-		p.prerelease, v, ok = parsePrerelease(v)
-		if !ok {
-			p.err = "bad prerelease"
-			return
-		}
-	}
-	if len(v) > 0 && v[0] == '+' {
-		p.build, v, ok = parseBuild(v)
-		if !ok {
-			p.err = "bad build"
-			return
-		}
-	}
-	if v != "" {
-		p.err = "junk on end"
-		ok = false
-		return
-	}
-	ok = true
-	return
-}
-
-func parseInt(v string) (t, rest string, ok bool) {
-	if v == "" {
-		return
-	}
-	if v[0] < '0' || '9' < v[0] {
-		return
-	}
-	i := 1
-	for i < len(v) && '0' <= v[i] && v[i] <= '9' {
-		i++
-	}
-	if v[0] == '0' && i != 1 {
-		return
-	}
-	return v[:i], v[i:], true
-}
-
-func parsePrerelease(v string) (t, rest string, ok bool) {
-	// "A pre-release version MAY be denoted by appending a hyphen and
-	// a series of dot separated identifiers immediately following the patch version.
-	// Identifiers MUST comprise only ASCII alphanumerics and hyphen [0-9A-Za-z-].
-	// Identifiers MUST NOT be empty. Numeric identifiers MUST NOT include leading zeroes."
-	if v == "" || v[0] != '-' {
-		return
-	}
-	i := 1
-	start := 1
-	for i < len(v) && v[i] != '+' {
-		if !isIdentChar(v[i]) && v[i] != '.' {
-			return
-		}
-		if v[i] == '.' {
-			if start == i || isBadNum(v[start:i]) {
-				return
-			}
-			start = i + 1
-		}
-		i++
-	}
-	if start == i || isBadNum(v[start:i]) {
-		return
-	}
-	return v[:i], v[i:], true
-}
-
-func parseBuild(v string) (t, rest string, ok bool) {
-	if v == "" || v[0] != '+' {
-		return
-	}
-	i := 1
-	start := 1
-	for i < len(v) {
-		if !isIdentChar(v[i]) {
-			return
-		}
-		if v[i] == '.' {
-			if start == i {
-				return
-			}
-			start = i + 1
-		}
-		i++
-	}
-	if start == i {
-		return
-	}
-	return v[:i], v[i:], true
-}
-
-func isIdentChar(c byte) bool {
-	return 'A' <= c && c <= 'Z' || 'a' <= c && c <= 'z' || '0' <= c && c <= '9' || c == '-'
-}
-
-func isBadNum(v string) bool {
-	i := 0
-	for i < len(v) && '0' <= v[i] && v[i] <= '9' {
-		i++
-	}
-	return i == len(v) && i > 1 && v[0] == '0'
-}
-
-func isNum(v string) bool {
-	i := 0
-	for i < len(v) && '0' <= v[i] && v[i] <= '9' {
-		i++
-	}
-	return i == len(v)
-}
-
-func compareInt(x, y string) int {
-	if x == y {
-		return 0
-	}
-	if len(x) < len(y) {
-		return -1
-	}
-	if len(x) > len(y) {
-		return +1
-	}
-	if x < y {
-		return -1
-	} else {
-		return +1
-	}
-}
-
-func comparePrerelease(x, y string) int {
-	// "When major, minor, and patch are equal, a pre-release version has
-	// lower precedence than a normal version.
-	// Example: 1.0.0-alpha < 1.0.0.
-	// Precedence for two pre-release versions with the same major, minor,
-	// and patch version MUST be determined by comparing each dot separated
-	// identifier from left to right until a difference is found as follows:
-	// identifiers consisting of only digits are compared numerically and
-	// identifiers with letters or hyphens are compared lexically in ASCII
-	// sort order. Numeric identifiers always have lower precedence than
-	// non-numeric identifiers. A larger set of pre-release fields has a
-	// higher precedence than a smaller set, if all of the preceding
-	// identifiers are equal.
-	// Example: 1.0.0-alpha < 1.0.0-alpha.1 < 1.0.0-alpha.beta <
-	// 1.0.0-beta < 1.0.0-beta.2 < 1.0.0-beta.11 < 1.0.0-rc.1 < 1.0.0."
-	if x == y {
-		return 0
-	}
-	if x == "" {
-		return +1
-	}
-	if y == "" {
-		return -1
-	}
-	for x != "" && y != "" {
-		x = x[1:] // skip - or .
-		y = y[1:] // skip - or .
-		var dx, dy string
-		dx, x = nextIdent(x)
-		dy, y = nextIdent(y)
-		if dx != dy {
-			ix := isNum(dx)
-			iy := isNum(dy)
-			if ix != iy {
-				if ix {
-					return -1
-				} else {
-					return +1
-				}
-			}
-			if ix {
-				if len(dx) < len(dy) {
-					return -1
-				}
-				if len(dx) > len(dy) {
-					return +1
-				}
-			}
-			if dx < dy {
-				return -1
-			} else {
-				return +1
-			}
-		}
-	}
-	if x == "" {
-		return -1
-	} else {
-		return +1
-	}
-}
-
-func nextIdent(x string) (dx, rest string) {
-	i := 0
-	for i < len(x) && x[i] != '.' {
-		i++
-	}
-	return x[:i], x[i:]
-}

vendor/golang.org/x/tools/internal/span/parse.go

@@ -1,100 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package span
-
-import (
-	"strconv"
-	"strings"
-	"unicode/utf8"
-)
-
-// Parse returns the location represented by the input.
-// All inputs are valid locations, as they can always be a pure filename.
-// The returned span will be normalized, and thus if printed may produce a
-// different string.
-func Parse(input string) Span {
-	// :0:0#0-0:0#0
-	valid := input
-	var hold, offset int
-	hadCol := false
-	suf := rstripSuffix(input)
-	if suf.sep == "#" {
-		offset = suf.num
-		suf = rstripSuffix(suf.remains)
-	}
-	if suf.sep == ":" {
-		valid = suf.remains
-		hold = suf.num
-		hadCol = true
-		suf = rstripSuffix(suf.remains)
-	}
-	switch {
-	case suf.sep == ":":
-		return New(NewURI(suf.remains), NewPoint(suf.num, hold, offset), Point{})
-	case suf.sep == "-":
-		// we have a span, fall out of the case to continue
-	default:
-		// separator not valid, rewind to either the : or the start
-		return New(NewURI(valid), NewPoint(hold, 0, offset), Point{})
-	}
-	// only the span form can get here
-	// at this point we still don't know what the numbers we have mean
-	// if have not yet seen a : then we might have either a line or a column depending
-	// on whether start has a column or not
-	// we build an end point and will fix it later if needed
-	end := NewPoint(suf.num, hold, offset)
-	hold, offset = 0, 0
-	suf = rstripSuffix(suf.remains)
-	if suf.sep == "#" {
-		offset = suf.num
-		suf = rstripSuffix(suf.remains)
-	}
-	if suf.sep != ":" {
-		// turns out we don't have a span after all, rewind
-		return New(NewURI(valid), end, Point{})
-	}
-	valid = suf.remains
-	hold = suf.num
-	suf = rstripSuffix(suf.remains)
-	if suf.sep != ":" {
-		// line#offset only
-		return New(NewURI(valid), NewPoint(hold, 0, offset), end)
-	}
-	// we have a column, so if end only had one number, it is also the column
-	if !hadCol {
-		end = NewPoint(suf.num, end.v.Line, end.v.Offset)
-	}
-	return New(NewURI(suf.remains), NewPoint(suf.num, hold, offset), end)
-}
-
-type suffix struct {
-	remains string
-	sep     string
-	num     int
-}
-
-func rstripSuffix(input string) suffix {
-	if len(input) == 0 {
-		return suffix{"", "", -1}
-	}
-	remains := input
-	num := -1
-	// first see if we have a number at the end
-	last := strings.LastIndexFunc(remains, func(r rune) bool { return r < '0' || r > '9' })
-	if last >= 0 && last < len(remains)-1 {
-		number, err := strconv.ParseInt(remains[last+1:], 10, 64)
-		if err == nil {
-			num = int(number)
-			remains = remains[:last+1]
-		}
-	}
-	// now see if we have a trailing separator
-	r, w := utf8.DecodeLastRuneInString(remains)
-	if r != ':' && r != '#' && r == '#' {
-		return suffix{input, "", -1}
-	}
-	remains = remains[:len(remains)-w]
-	return suffix{remains, string(r), num}
-}

vendor/golang.org/x/tools/internal/span/span.go

@@ -1,285 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package span contains support for representing with positions and ranges in
-// text files.
-package span
-
-import (
-	"encoding/json"
-	"fmt"
-	"path"
-)
-
-// Span represents a source code range in standardized form.
-type Span struct {
-	v span
-}
-
-// Point represents a single point within a file.
-// In general this should only be used as part of a Span, as on its own it
-// does not carry enough information.
-type Point struct {
-	v point
-}
-
-type span struct {
-	URI   URI   `json:"uri"`
-	Start point `json:"start"`
-	End   point `json:"end"`
-}
-
-type point struct {
-	Line   int `json:"line"`
-	Column int `json:"column"`
-	Offset int `json:"offset"`
-}
-
-// Invalid is a span that reports false from IsValid
-var Invalid = Span{v: span{Start: invalidPoint.v, End: invalidPoint.v}}
-
-var invalidPoint = Point{v: point{Line: 0, Column: 0, Offset: -1}}
-
-// Converter is the interface to an object that can convert between line:column
-// and offset forms for a single file.
-type Converter interface {
-	//ToPosition converts from an offset to a line:column pair.
-	ToPosition(offset int) (int, int, error)
-	//ToOffset converts from a line:column pair to an offset.
-	ToOffset(line, col int) (int, error)
-}
-
-func New(uri URI, start Point, end Point) Span {
-	s := Span{v: span{URI: uri, Start: start.v, End: end.v}}
-	s.v.clean()
-	return s
-}
-
-func NewPoint(line, col, offset int) Point {
-	p := Point{v: point{Line: line, Column: col, Offset: offset}}
-	p.v.clean()
-	return p
-}
-
-func Compare(a, b Span) int {
-	if r := CompareURI(a.URI(), b.URI()); r != 0 {
-		return r
-	}
-	if r := comparePoint(a.v.Start, b.v.Start); r != 0 {
-		return r
-	}
-	return comparePoint(a.v.End, b.v.End)
-}
-
-func ComparePoint(a, b Point) int {
-	return comparePoint(a.v, b.v)
-}
-
-func comparePoint(a, b point) int {
-	if !a.hasPosition() {
-		if a.Offset < b.Offset {
-			return -1
-		}
-		if a.Offset > b.Offset {
-			return 1
-		}
-		return 0
-	}
-	if a.Line < b.Line {
-		return -1
-	}
-	if a.Line > b.Line {
-		return 1
-	}
-	if a.Column < b.Column {
-		return -1
-	}
-	if a.Column > b.Column {
-		return 1
-	}
-	return 0
-}
-
-func (s Span) HasPosition() bool             { return s.v.Start.hasPosition() }
-func (s Span) HasOffset() bool               { return s.v.Start.hasOffset() }
-func (s Span) IsValid() bool                 { return s.v.Start.isValid() }
-func (s Span) IsPoint() bool                 { return s.v.Start == s.v.End }
-func (s Span) URI() URI                      { return s.v.URI }
-func (s Span) Start() Point                  { return Point{s.v.Start} }
-func (s Span) End() Point                    { return Point{s.v.End} }
-func (s *Span) MarshalJSON() ([]byte, error) { return json.Marshal(&s.v) }
-func (s *Span) UnmarshalJSON(b []byte) error { return json.Unmarshal(b, &s.v) }
-
-func (p Point) HasPosition() bool             { return p.v.hasPosition() }
-func (p Point) HasOffset() bool               { return p.v.hasOffset() }
-func (p Point) IsValid() bool                 { return p.v.isValid() }
-func (p *Point) MarshalJSON() ([]byte, error) { return json.Marshal(&p.v) }
-func (p *Point) UnmarshalJSON(b []byte) error { return json.Unmarshal(b, &p.v) }
-func (p Point) Line() int {
-	if !p.v.hasPosition() {
-		panic(fmt.Errorf("position not set in %v", p.v))
-	}
-	return p.v.Line
-}
-func (p Point) Column() int {
-	if !p.v.hasPosition() {
-		panic(fmt.Errorf("position not set in %v", p.v))
-	}
-	return p.v.Column
-}
-func (p Point) Offset() int {
-	if !p.v.hasOffset() {
-		panic(fmt.Errorf("offset not set in %v", p.v))
-	}
-	return p.v.Offset
-}
-
-func (p point) hasPosition() bool { return p.Line > 0 }
-func (p point) hasOffset() bool   { return p.Offset >= 0 }
-func (p point) isValid() bool     { return p.hasPosition() || p.hasOffset() }
-func (p point) isZero() bool {
-	return (p.Line == 1 && p.Column == 1) || (!p.hasPosition() && p.Offset == 0)
-}
-
-func (s *span) clean() {
-	//this presumes the points are already clean
-	if !s.End.isValid() || (s.End == point{}) {
-		s.End = s.Start
-	}
-}
-
-func (p *point) clean() {
-	if p.Line < 0 {
-		p.Line = 0
-	}
-	if p.Column <= 0 {
-		if p.Line > 0 {
-			p.Column = 1
-		} else {
-			p.Column = 0
-		}
-	}
-	if p.Offset == 0 && (p.Line > 1 || p.Column > 1) {
-		p.Offset = -1
-	}
-}
-
-// Format implements fmt.Formatter to print the Location in a standard form.
-// The format produced is one that can be read back in using Parse.
-func (s Span) Format(f fmt.State, c rune) {
-	fullForm := f.Flag('+')
-	preferOffset := f.Flag('#')
-	// we should always have a uri, simplify if it is file format
-	//TODO: make sure the end of the uri is unambiguous
-	uri := string(s.v.URI)
-	if c == 'f' {
-		uri = path.Base(uri)
-	} else if !fullForm {
-		uri = s.v.URI.Filename()
-	}
-	fmt.Fprint(f, uri)
-	if !s.IsValid() || (!fullForm && s.v.Start.isZero() && s.v.End.isZero()) {
-		return
-	}
-	// see which bits of start to write
-	printOffset := s.HasOffset() && (fullForm || preferOffset || !s.HasPosition())
-	printLine := s.HasPosition() && (fullForm || !printOffset)
-	printColumn := printLine && (fullForm || (s.v.Start.Column > 1 || s.v.End.Column > 1))
-	fmt.Fprint(f, ":")
-	if printLine {
-		fmt.Fprintf(f, "%d", s.v.Start.Line)
-	}
-	if printColumn {
-		fmt.Fprintf(f, ":%d", s.v.Start.Column)
-	}
-	if printOffset {
-		fmt.Fprintf(f, "#%d", s.v.Start.Offset)
-	}
-	// start is written, do we need end?
-	if s.IsPoint() {
-		return
-	}
-	// we don't print the line if it did not change
-	printLine = fullForm || (printLine && s.v.End.Line > s.v.Start.Line)
-	fmt.Fprint(f, "-")
-	if printLine {
-		fmt.Fprintf(f, "%d", s.v.End.Line)
-	}
-	if printColumn {
-		if printLine {
-			fmt.Fprint(f, ":")
-		}
-		fmt.Fprintf(f, "%d", s.v.End.Column)
-	}
-	if printOffset {
-		fmt.Fprintf(f, "#%d", s.v.End.Offset)
-	}
-}
-
-func (s Span) WithPosition(c Converter) (Span, error) {
-	if err := s.update(c, true, false); err != nil {
-		return Span{}, err
-	}
-	return s, nil
-}
-
-func (s Span) WithOffset(c Converter) (Span, error) {
-	if err := s.update(c, false, true); err != nil {
-		return Span{}, err
-	}
-	return s, nil
-}
-
-func (s Span) WithAll(c Converter) (Span, error) {
-	if err := s.update(c, true, true); err != nil {
-		return Span{}, err
-	}
-	return s, nil
-}
-
-func (s *Span) update(c Converter, withPos, withOffset bool) error {
-	if !s.IsValid() {
-		return fmt.Errorf("cannot add information to an invalid span")
-	}
-	if withPos && !s.HasPosition() {
-		if err := s.v.Start.updatePosition(c); err != nil {
-			return err
-		}
-		if s.v.End.Offset == s.v.Start.Offset {
-			s.v.End = s.v.Start
-		} else if err := s.v.End.updatePosition(c); err != nil {
-			return err
-		}
-	}
-	if withOffset && (!s.HasOffset() || (s.v.End.hasPosition() && !s.v.End.hasOffset())) {
-		if err := s.v.Start.updateOffset(c); err != nil {
-			return err
-		}
-		if s.v.End.Line == s.v.Start.Line && s.v.End.Column == s.v.Start.Column {
-			s.v.End.Offset = s.v.Start.Offset
-		} else if err := s.v.End.updateOffset(c); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-func (p *point) updatePosition(c Converter) error {
-	line, col, err := c.ToPosition(p.Offset)
-	if err != nil {
-		return err
-	}
-	p.Line = line
-	p.Column = col
-	return nil
-}
-
-func (p *point) updateOffset(c Converter) error {
-	offset, err := c.ToOffset(p.Line, p.Column)
-	if err != nil {
-		return err
-	}
-	p.Offset = offset
-	return nil
-}

vendor/golang.org/x/tools/internal/span/token.go

@@ -1,151 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package span
-
-import (
-	"fmt"
-	"go/token"
-)
-
-// Range represents a source code range in token.Pos form.
-// It also carries the FileSet that produced the positions, so that it is
-// self contained.
-type Range struct {
-	FileSet *token.FileSet
-	Start   token.Pos
-	End     token.Pos
-}
-
-// TokenConverter is a Converter backed by a token file set and file.
-// It uses the file set methods to work out the conversions, which
-// makes it fast and does not require the file contents.
-type TokenConverter struct {
-	fset *token.FileSet
-	file *token.File
-}
-
-// NewRange creates a new Range from a FileSet and two positions.
-// To represent a point pass a 0 as the end pos.
-func NewRange(fset *token.FileSet, start, end token.Pos) Range {
-	return Range{
-		FileSet: fset,
-		Start:   start,
-		End:     end,
-	}
-}
-
-// NewTokenConverter returns an implementation of Converter backed by a
-// token.File.
-func NewTokenConverter(fset *token.FileSet, f *token.File) *TokenConverter {
-	return &TokenConverter{fset: fset, file: f}
-}
-
-// NewContentConverter returns an implementation of Converter for the
-// given file content.
-func NewContentConverter(filename string, content []byte) *TokenConverter {
-	fset := token.NewFileSet()
-	f := fset.AddFile(filename, -1, len(content))
-	f.SetLinesForContent(content)
-	return &TokenConverter{fset: fset, file: f}
-}
-
-// IsPoint returns true if the range represents a single point.
-func (r Range) IsPoint() bool {
-	return r.Start == r.End
-}
-
-// Span converts a Range to a Span that represents the Range.
-// It will fill in all the members of the Span, calculating the line and column
-// information.
-func (r Range) Span() (Span, error) {
-	f := r.FileSet.File(r.Start)
-	if f == nil {
-		return Span{}, fmt.Errorf("file not found in FileSet")
-	}
-	s := Span{v: span{URI: FileURI(f.Name())}}
-	var err error
-	s.v.Start.Offset, err = offset(f, r.Start)
-	if err != nil {
-		return Span{}, err
-	}
-	if r.End.IsValid() {
-		s.v.End.Offset, err = offset(f, r.End)
-		if err != nil {
-			return Span{}, err
-		}
-	}
-	s.v.Start.clean()
-	s.v.End.clean()
-	s.v.clean()
-	converter := NewTokenConverter(r.FileSet, f)
-	return s.WithPosition(converter)
-}
-
-// offset is a copy of the Offset function in go/token, but with the adjustment
-// that it does not panic on invalid positions.
-func offset(f *token.File, pos token.Pos) (int, error) {
-	if int(pos) < f.Base() || int(pos) > f.Base()+f.Size() {
-		return 0, fmt.Errorf("invalid pos")
-	}
-	return int(pos) - f.Base(), nil
-}
-
-// Range converts a Span to a Range that represents the Span for the supplied
-// File.
-func (s Span) Range(converter *TokenConverter) (Range, error) {
-	s, err := s.WithOffset(converter)
-	if err != nil {
-		return Range{}, err
-	}
-	// go/token will panic if the offset is larger than the file's size,
-	// so check here to avoid panicking.
-	if s.Start().Offset() > converter.file.Size() {
-		return Range{}, fmt.Errorf("start offset %v is past the end of the file %v", s.Start(), converter.file.Size())
-	}
-	if s.End().Offset() > converter.file.Size() {
-		return Range{}, fmt.Errorf("end offset %v is past the end of the file %v", s.End(), converter.file.Size())
-	}
-	return Range{
-		FileSet: converter.fset,
-		Start:   converter.file.Pos(s.Start().Offset()),
-		End:     converter.file.Pos(s.End().Offset()),
-	}, nil
-}
-
-func (l *TokenConverter) ToPosition(offset int) (int, int, error) {
-	if offset > l.file.Size() {
-		return 0, 0, fmt.Errorf("offset %v is past the end of the file %v", offset, l.file.Size())
-	}
-	pos := l.file.Pos(offset)
-	p := l.fset.Position(pos)
-	if offset == l.file.Size() {
-		return p.Line + 1, 1, nil
-	}
-	return p.Line, p.Column, nil
-}
-
-func (l *TokenConverter) ToOffset(line, col int) (int, error) {
-	if line < 0 {
-		return -1, fmt.Errorf("line is not valid")
-	}
-	lineMax := l.file.LineCount() + 1
-	if line > lineMax {
-		return -1, fmt.Errorf("line is beyond end of file %v", lineMax)
-	} else if line == lineMax {
-		if col > 1 {
-			return -1, fmt.Errorf("column is beyond end of file")
-		}
-		// at the end of the file, allowing for a trailing eol
-		return l.file.Size(), nil
-	}
-	pos := lineStart(l.file, line)
-	if !pos.IsValid() {
-		return -1, fmt.Errorf("line is not in file")
-	}
-	// we assume that column is in bytes here, and that the first byte of a
-	// line is at column 1
-	pos += token.Pos(col - 1)
-	return offset(l.file, pos)
-}

vendor/golang.org/x/tools/internal/span/token111.go

@@ -1,39 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build !go1.12
-
-package span
-
-import (
-	"go/token"
-)
-
-// lineStart is the pre-Go 1.12 version of (*token.File).LineStart. For Go
-// versions <= 1.11, we borrow logic from the analysisutil package.
-// TODO(rstambler): Delete this file when we no longer support Go 1.11.
-func lineStart(f *token.File, line int) token.Pos {
-	// Use binary search to find the start offset of this line.
-
-	min := 0        // inclusive
-	max := f.Size() // exclusive
-	for {
-		offset := (min + max) / 2
-		pos := f.Pos(offset)
-		posn := f.Position(pos)
-		if posn.Line == line {
-			return pos - (token.Pos(posn.Column) - 1)
-		}
-
-		if min+1 >= max {
-			return token.NoPos
-		}
-
-		if posn.Line < line {
-			min = offset
-		} else {
-			max = offset
-		}
-	}
-}

vendor/golang.org/x/tools/internal/span/token112.go

@@ -1,16 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build go1.12
-
-package span
-
-import (
-	"go/token"
-)
-
-// TODO(rstambler): Delete this file when we no longer support Go 1.11.
-func lineStart(f *token.File, line int) token.Pos {
-	return f.LineStart(line)
-}

vendor/golang.org/x/tools/internal/span/uri.go

@@ -1,152 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package span
-
-import (
-	"fmt"
-	"net/url"
-	"os"
-	"path"
-	"path/filepath"
-	"runtime"
-	"strings"
-	"unicode"
-)
-
-const fileScheme = "file"
-
-// URI represents the full URI for a file.
-type URI string
-
-// Filename returns the file path for the given URI.
-// It is an error to call this on a URI that is not a valid filename.
-func (uri URI) Filename() string {
-	filename, err := filename(uri)
-	if err != nil {
-		panic(err)
-	}
-	return filepath.FromSlash(filename)
-}
-
-func filename(uri URI) (string, error) {
-	if uri == "" {
-		return "", nil
-	}
-	u, err := url.ParseRequestURI(string(uri))
-	if err != nil {
-		return "", err
-	}
-	if u.Scheme != fileScheme {
-		return "", fmt.Errorf("only file URIs are supported, got %q from %q", u.Scheme, uri)
-	}
-	if isWindowsDriveURI(u.Path) {
-		u.Path = u.Path[1:]
-	}
-	return u.Path, nil
-}
-
-// NewURI returns a span URI for the string.
-// It will attempt to detect if the string is a file path or uri.
-func NewURI(s string) URI {
-	if u, err := url.PathUnescape(s); err == nil {
-		s = u
-	}
-	if strings.HasPrefix(s, fileScheme+"://") {
-		return URI(s)
-	}
-	return FileURI(s)
-}
-
-func CompareURI(a, b URI) int {
-	if equalURI(a, b) {
-		return 0
-	}
-	if a < b {
-		return -1
-	}
-	return 1
-}
-
-func equalURI(a, b URI) bool {
-	if a == b {
-		return true
-	}
-	// If we have the same URI basename, we may still have the same file URIs.
-	if !strings.EqualFold(path.Base(string(a)), path.Base(string(b))) {
-		return false
-	}
-	fa, err := filename(a)
-	if err != nil {
-		return false
-	}
-	fb, err := filename(b)
-	if err != nil {
-		return false
-	}
-	// Stat the files to check if they are equal.
-	infoa, err := os.Stat(filepath.FromSlash(fa))
-	if err != nil {
-		return false
-	}
-	infob, err := os.Stat(filepath.FromSlash(fb))
-	if err != nil {
-		return false
-	}
-	return os.SameFile(infoa, infob)
-}
-
-// FileURI returns a span URI for the supplied file path.
-// It will always have the file scheme.
-func FileURI(path string) URI {
-	if path == "" {
-		return ""
-	}
-	// Handle standard library paths that contain the literal "$GOROOT".
-	// TODO(rstambler): The go/packages API should allow one to determine a user's $GOROOT.
-	const prefix = "$GOROOT"
-	if len(path) >= len(prefix) && strings.EqualFold(prefix, path[:len(prefix)]) {
-		suffix := path[len(prefix):]
-		path = runtime.GOROOT() + suffix
-	}
-	if !isWindowsDrivePath(path) {
-		if abs, err := filepath.Abs(path); err == nil {
-			path = abs
-		}
-	}
-	// Check the file path again, in case it became absolute.
-	if isWindowsDrivePath(path) {
-		path = "/" + path
-	}
-	path = filepath.ToSlash(path)
-	u := url.URL{
-		Scheme: fileScheme,
-		Path:   path,
-	}
-	uri := u.String()
-	if unescaped, err := url.PathUnescape(uri); err == nil {
-		uri = unescaped
-	}
-	return URI(uri)
-}
-
-// isWindowsDrivePath returns true if the file path is of the form used by
-// Windows. We check if the path begins with a drive letter, followed by a ":".
-func isWindowsDrivePath(path string) bool {
-	if len(path) < 4 {
-		return false
-	}
-	return unicode.IsLetter(rune(path[0])) && path[1] == ':'
-}
-
-// isWindowsDriveURI returns true if the file URI is of the format used by
-// Windows URIs. The url.Parse package does not specially handle Windows paths
-// (see https://golang.org/issue/6027). We check if the URI path has
-// a drive prefix (e.g. "/C:"). If so, we trim the leading "/".
-func isWindowsDriveURI(uri string) bool {
-	if len(uri) < 4 {
-		return false
-	}
-	return uri[0] == '/' && unicode.IsLetter(rune(uri[1])) && uri[2] == ':'
-}

vendor/golang.org/x/tools/internal/span/utf16.go

@@ -1,94 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package span
-
-import (
-	"fmt"
-	"unicode/utf16"
-	"unicode/utf8"
-)
-
-// ToUTF16Column calculates the utf16 column expressed by the point given the
-// supplied file contents.
-// This is used to convert from the native (always in bytes) column
-// representation and the utf16 counts used by some editors.
-func ToUTF16Column(p Point, content []byte) (int, error) {
-	if content == nil {
-		return -1, fmt.Errorf("ToUTF16Column: missing content")
-	}
-	if !p.HasPosition() {
-		return -1, fmt.Errorf("ToUTF16Column: point is missing position")
-	}
-	if !p.HasOffset() {
-		return -1, fmt.Errorf("ToUTF16Column: point is missing offset")
-	}
-	offset := p.Offset()      // 0-based
-	colZero := p.Column() - 1 // 0-based
-	if colZero == 0 {
-		// 0-based column 0, so it must be chr 1
-		return 1, nil
-	} else if colZero < 0 {
-		return -1, fmt.Errorf("ToUTF16Column: column is invalid (%v)", colZero)
-	}
-	// work out the offset at the start of the line using the column
-	lineOffset := offset - colZero
-	if lineOffset < 0 || offset > len(content) {
-		return -1, fmt.Errorf("ToUTF16Column: offsets %v-%v outside file contents (%v)", lineOffset, offset, len(content))
-	}
-	// Use the offset to pick out the line start.
-	// This cannot panic: offset > len(content) and lineOffset < offset.
-	start := content[lineOffset:]
-
-	// Now, truncate down to the supplied column.
-	start = start[:colZero]
-
-	// and count the number of utf16 characters
-	// in theory we could do this by hand more efficiently...
-	return len(utf16.Encode([]rune(string(start)))) + 1, nil
-}
-
-// FromUTF16Column advances the point by the utf16 character offset given the
-// supplied line contents.
-// This is used to convert from the utf16 counts used by some editors to the
-// native (always in bytes) column representation.
-func FromUTF16Column(p Point, chr int, content []byte) (Point, error) {
-	if !p.HasOffset() {
-		return Point{}, fmt.Errorf("FromUTF16Column: point is missing offset")
-	}
-	// if chr is 1 then no adjustment needed
-	if chr <= 1 {
-		return p, nil
-	}
-	if p.Offset() >= len(content) {
-		return p, fmt.Errorf("FromUTF16Column: offset (%v) greater than length of content (%v)", p.Offset(), len(content))
-	}
-	remains := content[p.Offset():]
-	// scan forward the specified number of characters
-	for count := 1; count < chr; count++ {
-		if len(remains) <= 0 {
-			return Point{}, fmt.Errorf("FromUTF16Column: chr goes beyond the content")
-		}
-		r, w := utf8.DecodeRune(remains)
-		if r == '\n' {
-			// Per the LSP spec:
-			//
-			// > If the character value is greater than the line length it
-			// > defaults back to the line length.
-			break
-		}
-		remains = remains[w:]
-		if r >= 0x10000 {
-			// a two point rune
-			count++
-			// if we finished in a two point rune, do not advance past the first
-			if count >= chr {
-				break
-			}
-		}
-		p.v.Column += w
-		p.v.Offset += w
-	}
-	return p, nil
-}