| // 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 cache |
| |
| import ( |
| "fmt" |
| "go/ast" |
| "go/token" |
| "io/ioutil" |
| |
| "golang.org/x/tools/go/packages" |
| "golang.org/x/tools/internal/lsp/source" |
| ) |
| |
| // File holds all the information we know about a file. |
| type File struct { |
| URI source.URI |
| view *View |
| active bool |
| content []byte |
| ast *ast.File |
| token *token.File |
| pkg *packages.Package |
| } |
| |
| // Read returns the contents of the file, reading it from file system if needed. |
| func (f *File) Read() ([]byte, error) { |
| f.view.mu.Lock() |
| defer f.view.mu.Unlock() |
| return f.read() |
| } |
| |
| func (f *File) GetFileSet() (*token.FileSet, error) { |
| if f.view.Config.Fset == nil { |
| return nil, fmt.Errorf("no fileset for file view config") |
| } |
| return f.view.Config.Fset, nil |
| } |
| |
| func (f *File) GetToken() (*token.File, error) { |
| f.view.mu.Lock() |
| defer f.view.mu.Unlock() |
| if f.token == nil { |
| if err := f.view.parse(f.URI); err != nil { |
| return nil, err |
| } |
| if f.token == nil { |
| return nil, fmt.Errorf("failed to find or parse %v", f.URI) |
| } |
| } |
| return f.token, nil |
| } |
| |
| func (f *File) GetAST() (*ast.File, error) { |
| f.view.mu.Lock() |
| defer f.view.mu.Unlock() |
| if f.ast == nil { |
| if err := f.view.parse(f.URI); err != nil { |
| return nil, err |
| } |
| } |
| return f.ast, nil |
| } |
| |
| func (f *File) GetPackage() (*packages.Package, error) { |
| f.view.mu.Lock() |
| defer f.view.mu.Unlock() |
| if f.pkg == nil { |
| if err := f.view.parse(f.URI); err != nil { |
| return nil, err |
| } |
| } |
| return f.pkg, nil |
| } |
| |
| // read is the internal part of Read that presumes the lock is already held |
| func (f *File) read() ([]byte, error) { |
| if f.content != nil { |
| return f.content, nil |
| } |
| // we don't know the content yet, so read it |
| filename, err := f.URI.Filename() |
| if err != nil { |
| return nil, err |
| } |
| content, err := ioutil.ReadFile(filename) |
| if err != nil { |
| return nil, err |
| } |
| f.content = content |
| return f.content, nil |
| } |