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// 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 source
import (
"fmt"
"net/url"
"path/filepath"
"runtime"
"strings"
"unicode"
)
const fileScheme = "file"
// URI represents the full URI for a file.
type URI string
// Filename gets the file path for the URI.
// It will return an error if the uri is not valid, or if the URI was not
// a file URI
func (uri URI) Filename() (string, error) {
filename, err := filename(uri)
if err != nil {
return "", err
}
return filepath.FromSlash(filename), nil
}
func filename(uri URI) (string, error) {
u, err := url.ParseRequestURI(string(uri))
if err != nil {
return "", err
}
if u.Scheme != fileScheme {
return "", fmt.Errorf("only file URIs are supported, got %v", u.Scheme)
}
if isWindowsDriveURI(u.Path) {
u.Path = u.Path[1:]
}
return u.Path, nil
}
// ToURI returns a protocol URI for the supplied path.
// It will always have the file scheme.
func ToURI(path string) URI {
u := toURI(path)
u.Path = filepath.ToSlash(u.Path)
return URI(u.String())
}
func toURI(path string) *url.URL {
// Handle standard library paths that contain the literal "$GOROOT".
// TODO(rstambler): The go/packages API should allow one to determine a user's $GOROOT.
const prefix = "$GOROOT"
if len(path) >= len(prefix) && strings.EqualFold(prefix, path[:len(prefix)]) {
suffix := path[len(prefix):]
path = runtime.GOROOT() + suffix
}
if isWindowsDrivePath(path) {
path = "/" + path
}
return &url.URL{
Scheme: fileScheme,
Path: path,
}
}
// isWindowsDrivePath returns true if the file path is of the form used by
// Windows. We check if the path begins with a drive letter, followed by a ":".
func isWindowsDrivePath(path string) bool {
if len(path) < 4 {
return false
}
return unicode.IsLetter(rune(path[0])) && path[1] == ':'
}
// isWindowsDriveURI returns true if the file URI is of the format used by
// Windows URIs. The url.Parse package does not specially handle Windows paths
// (see https://github.com/golang/go/issues/6027). We check if the URI path has
// a drive prefix (e.g. "/C:"). If so, we trim the leading "/".
func isWindowsDriveURI(uri string) bool {
if len(uri) < 4 {
return false
}
return uri[0] == '/' && unicode.IsLetter(rune(uri[1])) && uri[2] == ':'
}
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