mirror of
https://github.com/golang/go
synced 2024-10-01 04:08:32 -06:00
dbad8e90c9
This rationalises all the position handling and conversion code out. Fixes golang/go#29149 Change-Id: I2814f3e8ba769924bc70f35df9e5bf4d97d064de Reviewed-on: https://go-review.googlesource.com/c/tools/+/166884 Reviewed-by: Rebecca Stambler <rstambler@golang.org>
118 lines
2.4 KiB
Go
118 lines
2.4 KiB
Go
// Copyright 2018 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 cache
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import (
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"context"
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"go/ast"
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"go/token"
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"io/ioutil"
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"golang.org/x/tools/internal/lsp/source"
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"golang.org/x/tools/internal/span"
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)
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// File holds all the information we know about a file.
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type File struct {
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uri span.URI
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view *View
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active bool
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content []byte
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ast *ast.File
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token *token.File
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pkg *Package
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meta *metadata
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imports []*ast.ImportSpec
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}
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func (f *File) URI() span.URI {
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return f.uri
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}
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// GetContent returns the contents of the file, reading it from file system if needed.
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func (f *File) GetContent(ctx context.Context) []byte {
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f.view.mu.Lock()
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defer f.view.mu.Unlock()
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if ctx.Err() == nil {
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f.read(ctx)
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}
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return f.content
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}
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func (f *File) GetFileSet(ctx context.Context) *token.FileSet {
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return f.view.Config.Fset
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}
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func (f *File) GetToken(ctx context.Context) *token.File {
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f.view.mu.Lock()
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defer f.view.mu.Unlock()
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if f.token == nil || len(f.view.contentChanges) > 0 {
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if err := f.view.parse(ctx, f.uri); err != nil {
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return nil
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}
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}
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return f.token
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}
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func (f *File) GetAST(ctx context.Context) *ast.File {
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f.view.mu.Lock()
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defer f.view.mu.Unlock()
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if f.ast == nil || len(f.view.contentChanges) > 0 {
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if err := f.view.parse(ctx, f.uri); err != nil {
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return nil
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}
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}
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return f.ast
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}
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func (f *File) GetPackage(ctx context.Context) source.Package {
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f.view.mu.Lock()
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defer f.view.mu.Unlock()
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if f.pkg == nil || len(f.view.contentChanges) > 0 {
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if err := f.view.parse(ctx, f.uri); err != nil {
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return nil
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}
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}
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return f.pkg
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}
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// read is the internal part of GetContent. It assumes that the caller is
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// holding the mutex of the file's view.
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func (f *File) read(ctx context.Context) {
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if f.content != nil {
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if len(f.view.contentChanges) == 0 {
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return
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}
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f.view.mcache.mu.Lock()
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err := f.view.applyContentChanges(ctx)
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f.view.mcache.mu.Unlock()
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if err == nil {
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return
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}
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}
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// We don't know the content yet, so read it.
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filename, err := f.uri.Filename()
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if err != nil {
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return
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}
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content, err := ioutil.ReadFile(filename)
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if err != nil {
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return
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}
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f.content = content
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}
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// isPopulated returns true if all of the computed fields of the file are set.
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func (f *File) isPopulated() bool {
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return f.ast != nil && f.token != nil && f.pkg != nil && f.meta != nil && f.imports != nil
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}
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