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// Copyright 2019 The CC 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 cc
import (
"io"
"io/ioutil"
"os"
"path"
"strings"
"time"
)
// Filesystem abstraction used in CC. The underlying value must be comparable (e.g. pointer) to be used in map keys.
type Filesystem interface {
// Stat is an analog of os.Stat, but also accepts a flag to indicate a system include (<file.h>).
Stat(path string, sys bool) (os.FileInfo, error)
// Open is an analog of os.Open, but also accepts a flag to indicate a system include (<file.h>).
Open(path string, sys bool) (io.ReadCloser, error)
}
// LocalFS returns a local filesystem implementation.
func LocalFS() Filesystem {
return localFS{}
}
type localFS struct{}
// Stat implements Filesystem.
func (localFS) Stat(path string, sys bool) (os.FileInfo, error) {
return os.Stat(path)
}
// Open implements Filesystem.
func (localFS) Open(path string, sys bool) (io.ReadCloser, error) {
return os.Open(path)
}
// WorkingDir is a filesystem implementation that resolves paths relative to a given directory.
// If filesystem is not specified, the local one will be used.
func WorkingDir(wd string, fs Filesystem) Filesystem {
if fs == nil {
fs = LocalFS()
}
return workDir{fs: fs, wd: wd}
}
type workDir struct {
fs Filesystem
wd string
}
// Stat implements Filesystem.
func (fs workDir) Stat(fname string, sys bool) (os.FileInfo, error) {
if !path.IsAbs(fname) {
fname = path.Join(fs.wd, fname)
}
return fs.fs.Stat(fname, sys)
}
// Open implements Filesystem.
func (fs workDir) Open(fname string, sys bool) (io.ReadCloser, error) {
if !path.IsAbs(fname) {
fname = path.Join(fs.wd, fname)
}
return fs.fs.Open(fname, sys)
}
// Overlay is a filesystem implementation that first check if the file is available in the primary FS
// and if not, falls back to a secondary FS.
func Overlay(pri, sec Filesystem) Filesystem {
return overlayFS{pri: pri, sec: sec}
}
type overlayFS struct {
pri, sec Filesystem
}
// Stat implements Filesystem.
func (fs overlayFS) Stat(path string, sys bool) (os.FileInfo, error) {
st, err := fs.pri.Stat(path, sys)
if err == nil || !os.IsNotExist(err) {
return st, err
}
return fs.sec.Stat(path, sys)
}
// Open implements Filesystem.
func (fs overlayFS) Open(path string, sys bool) (io.ReadCloser, error) {
f, err := fs.pri.Open(path, sys)
if err == nil || !os.IsNotExist(err) {
return f, err
}
return fs.sec.Open(path, sys)
}
// StaticFS implements filesystem interface by serving string values form the provided map.
func StaticFS(files map[string]string) Filesystem {
return &staticFS{m: files, ts: time.Now()}
}
type staticFS struct {
ts time.Time
m map[string]string
}
// Stat implements Filesystem.
func (fs *staticFS) Stat(path string, sys bool) (os.FileInfo, error) {
v, ok := fs.m[path]
if !ok {
return nil, &os.PathError{"stat", path, os.ErrNotExist}
}
return staticFileInfo{name: path, size: int64(len(v)), mode: 0, mod: fs.ts}, nil
}
// Open implements Filesystem.
func (fs *staticFS) Open(path string, sys bool) (io.ReadCloser, error) {
v, ok := fs.m[path]
if !ok {
return nil, &os.PathError{"open", path, os.ErrNotExist}
}
return ioutil.NopCloser(strings.NewReader(v)), nil
}
type staticFileInfo struct {
name string
size int64
mode os.FileMode
mod time.Time
}
func (fi staticFileInfo) Name() string {
return fi.name
}
func (fi staticFileInfo) Size() int64 {
return fi.size
}
func (fi staticFileInfo) Mode() os.FileMode {
return fi.mode
}
func (fi staticFileInfo) ModTime() time.Time {
return fi.mod
}
func (fi staticFileInfo) IsDir() bool {
return fi.mode.IsDir()
}
func (fi staticFileInfo) Sys() interface{} {
return fi
}
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