113 lines
2.6 KiB
Go
113 lines
2.6 KiB
Go
// Copyright 2013 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 loader
|
|
|
|
import (
|
|
"go/ast"
|
|
"go/build"
|
|
"go/parser"
|
|
"go/token"
|
|
"path/filepath"
|
|
"sync"
|
|
)
|
|
|
|
// parsePackageFiles enumerates the files belonging to package path,
|
|
// then loads, parses and returns them.
|
|
//
|
|
// 'which' is a list of flags indicating which files to include:
|
|
// 'g': include non-test *.go source files (GoFiles)
|
|
// 't': include in-package *_test.go source files (TestGoFiles)
|
|
// 'x': include external *_test.go source files. (XTestGoFiles)
|
|
//
|
|
func parsePackageFiles(ctxt *build.Context, fset *token.FileSet, path string, which string) ([]*ast.File, error) {
|
|
// Set the "!cgo" go/build tag, preferring (dummy) Go to
|
|
// native C implementations of net.cgoLookupHost et al.
|
|
ctxt2 := *ctxt
|
|
ctxt2.CgoEnabled = false
|
|
|
|
// Import(srcDir="") disables local imports, e.g. import "./foo".
|
|
bp, err := ctxt2.Import(path, "", 0)
|
|
if _, ok := err.(*build.NoGoError); ok {
|
|
return nil, nil // empty directory
|
|
}
|
|
if err != nil {
|
|
return nil, err // import failed
|
|
}
|
|
|
|
var filenames []string
|
|
for _, c := range which {
|
|
var s []string
|
|
switch c {
|
|
case 'g':
|
|
s = bp.GoFiles
|
|
case 't':
|
|
s = bp.TestGoFiles
|
|
case 'x':
|
|
s = bp.XTestGoFiles
|
|
default:
|
|
panic(c)
|
|
}
|
|
filenames = append(filenames, s...)
|
|
}
|
|
return parseFiles(fset, bp.Dir, filenames...)
|
|
}
|
|
|
|
// parseFiles parses the Go source files files within directory dir
|
|
// and returns their ASTs, or the first parse error if any.
|
|
//
|
|
func parseFiles(fset *token.FileSet, dir string, files ...string) ([]*ast.File, error) {
|
|
var wg sync.WaitGroup
|
|
n := len(files)
|
|
parsed := make([]*ast.File, n, n)
|
|
errors := make([]error, n, n)
|
|
for i, file := range files {
|
|
if !filepath.IsAbs(file) {
|
|
file = filepath.Join(dir, file)
|
|
}
|
|
wg.Add(1)
|
|
go func(i int, file string) {
|
|
parsed[i], errors[i] = parser.ParseFile(fset, file, nil, 0)
|
|
wg.Done()
|
|
}(i, file)
|
|
}
|
|
wg.Wait()
|
|
|
|
for _, err := range errors {
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return parsed, nil
|
|
}
|
|
|
|
// ---------- Internal helpers ----------
|
|
|
|
// unparen returns e with any enclosing parentheses stripped.
|
|
func unparen(e ast.Expr) ast.Expr {
|
|
for {
|
|
p, ok := e.(*ast.ParenExpr)
|
|
if !ok {
|
|
break
|
|
}
|
|
e = p.X
|
|
}
|
|
return e
|
|
}
|
|
|
|
func unreachable() {
|
|
panic("unreachable")
|
|
}
|
|
|
|
// TODO(adonovan): make this a method: func (*token.File) Contains(token.Pos)
|
|
func tokenFileContainsPos(f *token.File, pos token.Pos) bool {
|
|
p := int(pos)
|
|
base := f.Base()
|
|
return base <= p && p < base+f.Size()
|
|
}
|
|
|
|
func filename(file *ast.File, fset *token.FileSet) string {
|
|
return fset.File(file.Pos()).Name()
|
|
}
|