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69e0dcfa11
Instead of calling packages.Load on every character change, we reparse the import declarations of the file and determine if they have changed. We also introduce a metadata cache that caches the import graph. This is used in type-checking and only updated on calls to packages.Load. Change-Id: I7cb384aba77ef3c1565d3b0db58e6c754d5fed15 Reviewed-on: https://go-review.googlesource.com/c/tools/+/165137 Reviewed-by: Ian Cottrell <iancottrell@google.com> Run-TryBot: Ian Cottrell <iancottrell@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
91 lines
1.7 KiB
Go
91 lines
1.7 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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"go/ast"
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"go/token"
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"io/ioutil"
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"golang.org/x/tools/go/packages"
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"golang.org/x/tools/internal/lsp/source"
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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 source.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 *packages.Package
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meta *metadata
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imports []*ast.ImportSpec
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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() []byte {
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f.view.mu.Lock()
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defer f.view.mu.Unlock()
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f.read()
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return f.content
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}
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func (f *File) GetFileSet() *token.FileSet {
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return f.view.Config.Fset
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}
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func (f *File) GetToken() *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 {
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if err := f.view.parse(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() *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 {
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if err := f.view.parse(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() *packages.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 {
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if err := f.view.parse(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() {
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if f.content != nil {
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return
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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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