+++ /dev/null
-// Copyright 2014 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 buildutil
-
-import (
- "fmt"
- "go/ast"
- "go/build"
- "go/parser"
- "go/token"
- "io"
- "io/ioutil"
- "os"
- "path"
- "path/filepath"
- "strings"
-)
-
-// ParseFile behaves like parser.ParseFile,
-// but uses the build context's file system interface, if any.
-//
-// If file is not absolute (as defined by IsAbsPath), the (dir, file)
-// components are joined using JoinPath; dir must be absolute.
-//
-// The displayPath function, if provided, is used to transform the
-// filename that will be attached to the ASTs.
-//
-// TODO(adonovan): call this from go/loader.parseFiles when the tree thaws.
-//
-func ParseFile(fset *token.FileSet, ctxt *build.Context, displayPath func(string) string, dir string, file string, mode parser.Mode) (*ast.File, error) {
- if !IsAbsPath(ctxt, file) {
- file = JoinPath(ctxt, dir, file)
- }
- rd, err := OpenFile(ctxt, file)
- if err != nil {
- return nil, err
- }
- defer rd.Close() // ignore error
- if displayPath != nil {
- file = displayPath(file)
- }
- return parser.ParseFile(fset, file, rd, mode)
-}
-
-// ContainingPackage returns the package containing filename.
-//
-// If filename is not absolute, it is interpreted relative to working directory dir.
-// All I/O is via the build context's file system interface, if any.
-//
-// The '...Files []string' fields of the resulting build.Package are not
-// populated (build.FindOnly mode).
-//
-func ContainingPackage(ctxt *build.Context, dir, filename string) (*build.Package, error) {
- if !IsAbsPath(ctxt, filename) {
- filename = JoinPath(ctxt, dir, filename)
- }
-
- // We must not assume the file tree uses
- // "/" always,
- // `\` always,
- // or os.PathSeparator (which varies by platform),
- // but to make any progress, we are forced to assume that
- // paths will not use `\` unless the PathSeparator
- // is also `\`, thus we can rely on filepath.ToSlash for some sanity.
-
- dirSlash := path.Dir(filepath.ToSlash(filename)) + "/"
-
- // We assume that no source root (GOPATH[i] or GOROOT) contains any other.
- for _, srcdir := range ctxt.SrcDirs() {
- srcdirSlash := filepath.ToSlash(srcdir) + "/"
- if importPath, ok := HasSubdir(ctxt, srcdirSlash, dirSlash); ok {
- return ctxt.Import(importPath, dir, build.FindOnly)
- }
- }
-
- return nil, fmt.Errorf("can't find package containing %s", filename)
-}
-
-// -- Effective methods of file system interface -------------------------
-
-// (go/build.Context defines these as methods, but does not export them.)
-
-// hasSubdir calls ctxt.HasSubdir (if not nil) or else uses
-// the local file system to answer the question.
-func HasSubdir(ctxt *build.Context, root, dir string) (rel string, ok bool) {
- if f := ctxt.HasSubdir; f != nil {
- return f(root, dir)
- }
-
- // Try using paths we received.
- if rel, ok = hasSubdir(root, dir); ok {
- return
- }
-
- // Try expanding symlinks and comparing
- // expanded against unexpanded and
- // expanded against expanded.
- rootSym, _ := filepath.EvalSymlinks(root)
- dirSym, _ := filepath.EvalSymlinks(dir)
-
- if rel, ok = hasSubdir(rootSym, dir); ok {
- return
- }
- if rel, ok = hasSubdir(root, dirSym); ok {
- return
- }
- return hasSubdir(rootSym, dirSym)
-}
-
-func hasSubdir(root, dir string) (rel string, ok bool) {
- const sep = string(filepath.Separator)
- root = filepath.Clean(root)
- if !strings.HasSuffix(root, sep) {
- root += sep
- }
-
- dir = filepath.Clean(dir)
- if !strings.HasPrefix(dir, root) {
- return "", false
- }
-
- return filepath.ToSlash(dir[len(root):]), true
-}
-
-// FileExists returns true if the specified file exists,
-// using the build context's file system interface.
-func FileExists(ctxt *build.Context, path string) bool {
- if ctxt.OpenFile != nil {
- r, err := ctxt.OpenFile(path)
- if err != nil {
- return false
- }
- r.Close() // ignore error
- return true
- }
- _, err := os.Stat(path)
- return err == nil
-}
-
-// OpenFile behaves like os.Open,
-// but uses the build context's file system interface, if any.
-func OpenFile(ctxt *build.Context, path string) (io.ReadCloser, error) {
- if ctxt.OpenFile != nil {
- return ctxt.OpenFile(path)
- }
- return os.Open(path)
-}
-
-// IsAbsPath behaves like filepath.IsAbs,
-// but uses the build context's file system interface, if any.
-func IsAbsPath(ctxt *build.Context, path string) bool {
- if ctxt.IsAbsPath != nil {
- return ctxt.IsAbsPath(path)
- }
- return filepath.IsAbs(path)
-}
-
-// JoinPath behaves like filepath.Join,
-// but uses the build context's file system interface, if any.
-func JoinPath(ctxt *build.Context, path ...string) string {
- if ctxt.JoinPath != nil {
- return ctxt.JoinPath(path...)
- }
- return filepath.Join(path...)
-}
-
-// IsDir behaves like os.Stat plus IsDir,
-// but uses the build context's file system interface, if any.
-func IsDir(ctxt *build.Context, path string) bool {
- if ctxt.IsDir != nil {
- return ctxt.IsDir(path)
- }
- fi, err := os.Stat(path)
- return err == nil && fi.IsDir()
-}
-
-// ReadDir behaves like ioutil.ReadDir,
-// but uses the build context's file system interface, if any.
-func ReadDir(ctxt *build.Context, path string) ([]os.FileInfo, error) {
- if ctxt.ReadDir != nil {
- return ctxt.ReadDir(path)
- }
- return ioutil.ReadDir(path)
-}
-
-// SplitPathList behaves like filepath.SplitList,
-// but uses the build context's file system interface, if any.
-func SplitPathList(ctxt *build.Context, s string) []string {
- if ctxt.SplitPathList != nil {
- return ctxt.SplitPathList(s)
- }
- return filepath.SplitList(s)
-}
-
-// sameFile returns true if x and y have the same basename and denote
-// the same file.
-//
-func sameFile(x, y string) bool {
- if path.Clean(x) == path.Clean(y) {
- return true
- }
- if filepath.Base(x) == filepath.Base(y) { // (optimisation)
- if xi, err := os.Stat(x); err == nil {
- if yi, err := os.Stat(y); err == nil {
- return os.SameFile(xi, yi)
- }
- }
- }
- return false
-}
projects / dotfiles / .git / blobdiff