forked from odeke-em/drive
/
ripper.go
93 lines (77 loc) · 1.86 KB
/
ripper.go
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// Copyright 2015 Emmanuel Odeke. 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 ripper
import (
"bufio"
"bytes"
"os"
"regexp"
)
type diction struct {
skip *regexp.Regexp
end *regexp.Regexp
begin *regexp.Regexp
}
func readFile(absPath string, dctn *diction) (content string, err error) {
var f *os.File
f, err = os.Open(absPath)
if err != nil || f == nil {
return
}
defer f.Close()
scanner := bufio.NewScanner(f)
results := [][]byte{}
canSkip := dctn.skip != nil
canEnd := dctn.end != nil
canBegin := dctn.begin != nil
if canBegin {
for scanner.Scan() {
lineBytes := scanner.Bytes()
if dctn.begin.Match(lineBytes) {
results = append(results, lineBytes)
break
}
}
}
for scanner.Scan() {
lineBytes := scanner.Bytes()
if canEnd && dctn.end.Match(lineBytes) {
break
}
if canSkip && dctn.skip.Match(lineBytes) {
continue
}
results = append(results, lineBytes)
}
joined := bytes.Join(results, []byte{'\n'})
content = string(joined)
return
}
func ApacheTopLicenseRip(absPath string) (content string, err error) {
var begin, end *regexp.Regexp
begin, err = regexp.Compile("^//\\s*Copyright")
if err != nil {
return
}
end, err = regexp.Compile("^package")
if err != nil {
return
}
dctn := diction{
skip: nil,
end: end,
begin: begin,
}
return readFile(absPath, &dctn)
}