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// Copyright 2021 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package response
import (
"io"
"io/ioutil"
"strings"
"unicode"
)
const noQuote = '\x00'
// ReadRspFile reads a file in Ninja's response file format and returns its contents.
func ReadRspFile(r io.Reader) ([]string, error) {
var files []string
var file []byte
buf, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
isEscaping := false
quotingStart := byte(noQuote)
for _, c := range buf {
switch {
case isEscaping:
if quotingStart == '"' {
if !(c == '"' || c == '\\') {
// '\"' or '\\' will be escaped under double quoting.
file = append(file, '\\')
}
}
file = append(file, c)
isEscaping = false
case c == '\\' && quotingStart != '\'':
isEscaping = true
case quotingStart == noQuote && (c == '\'' || c == '"'):
quotingStart = c
case quotingStart != noQuote && c == quotingStart:
quotingStart = noQuote
case quotingStart == noQuote && unicode.IsSpace(rune(c)):
// Current character is a space outside quotes
if len(file) != 0 {
files = append(files, string(file))
}
file = file[:0]
default:
file = append(file, c)
}
}
if len(file) != 0 {
files = append(files, string(file))
}
return files, nil
}
func rspUnsafeChar(r rune) bool {
switch {
case 'A' <= r && r <= 'Z',
'a' <= r && r <= 'z',
'0' <= r && r <= '9',
r == '_',
r == '+',
r == '-',
r == '.',
r == '/':
return false
default:
return true
}
}
var rspEscaper = strings.NewReplacer(`'`, `'\''`)
// WriteRspFile writes a list of files to a file in Ninja's response file format.
func WriteRspFile(w io.Writer, files []string) error {
for i, f := range files {
if i != 0 {
_, err := io.WriteString(w, " ")
if err != nil {
return err
}
}
if strings.IndexFunc(f, rspUnsafeChar) != -1 {
f = `'` + rspEscaper.Replace(f) + `'`
}
_, err := io.WriteString(w, f)
if err != nil {
return err
}
}
return nil
}
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