mirror of
https://github.com/golang/go
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8456940f41
This change encompasses the refactorings needed to correctly implement CL 204079. The goal of this CL is to make the actual relevant diffs more clear. Change-Id: I38acfd436e2380be790910e01b6e37d8280e9100 Reviewed-on: https://go-review.googlesource.com/c/tools/+/204139 Run-TryBot: Rebecca Stambler <rstambler@golang.org> Reviewed-by: Ian Cottrell <iancottrell@google.com>
98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package source
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import (
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"context"
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"go/ast"
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"go/types"
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"golang.org/x/tools/internal/telemetry/trace"
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errors "golang.org/x/xerrors"
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)
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// ReferenceInfo holds information about reference to an identifier in Go source.
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type ReferenceInfo struct {
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Name string
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mappedRange
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ident *ast.Ident
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obj types.Object
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pkg Package
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isDeclaration bool
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}
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// References returns a list of references for a given identifier within the packages
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// containing i.File. Declarations appear first in the result.
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func (i *IdentifierInfo) References(ctx context.Context) ([]*ReferenceInfo, error) {
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ctx, done := trace.StartSpan(ctx, "source.References")
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defer done()
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var references []*ReferenceInfo
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// If the object declaration is nil, assume it is an import spec and do not look for references.
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if i.Declaration.obj == nil {
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return nil, errors.Errorf("no references for an import spec")
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}
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info := i.pkg.GetTypesInfo()
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if info == nil {
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return nil, errors.Errorf("package %s has no types info", i.pkg.PkgPath())
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}
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if i.Declaration.wasImplicit {
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// The definition is implicit, so we must add it separately.
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// This occurs when the variable is declared in a type switch statement
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// or is an implicit package name. Both implicits are local to a file.
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references = append(references, &ReferenceInfo{
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Name: i.Declaration.obj.Name(),
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mappedRange: i.Declaration.mappedRange,
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obj: i.Declaration.obj,
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pkg: i.pkg,
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isDeclaration: true,
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})
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}
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for ident, obj := range info.Defs {
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if obj == nil || !sameObj(obj, i.Declaration.obj) {
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continue
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}
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rng, err := posToMappedRange(ctx, i.Snapshot.View(), i.pkg, ident.Pos(), ident.End())
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if err != nil {
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return nil, err
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}
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// Add the declarations at the beginning of the references list.
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references = append([]*ReferenceInfo{{
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Name: ident.Name,
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ident: ident,
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obj: obj,
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pkg: i.pkg,
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isDeclaration: true,
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mappedRange: rng,
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}}, references...)
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}
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for ident, obj := range info.Uses {
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if obj == nil || !sameObj(obj, i.Declaration.obj) {
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continue
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}
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rng, err := posToMappedRange(ctx, i.Snapshot.View(), i.pkg, ident.Pos(), ident.End())
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if err != nil {
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return nil, err
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}
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references = append(references, &ReferenceInfo{
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Name: ident.Name,
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ident: ident,
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pkg: i.pkg,
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obj: obj,
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mappedRange: rng,
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})
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}
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return references, nil
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}
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// sameObj returns true if obj is the same as declObj.
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// Objects are the same if they have the some Pos and Name.
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func sameObj(obj, declObj types.Object) bool {
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// TODO(suzmue): support the case where an identifier may have two different
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// declaration positions.
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return obj.Pos() == declObj.Pos() && obj.Name() == declObj.Name()
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}
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