mirror of
https://github.com/go-gitea/gitea
synced 2025-11-03 21:08:25 +00:00
93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
// Copyright (c) 2014 Couchbase, Inc.
|
|
//
|
|
// 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 analysis
|
|
|
|
import (
|
|
"bytes"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
func DeleteRune(in []rune, pos int) []rune {
|
|
if pos >= len(in) {
|
|
return in
|
|
}
|
|
copy(in[pos:], in[pos+1:])
|
|
return in[:len(in)-1]
|
|
}
|
|
|
|
func InsertRune(in []rune, pos int, r rune) []rune {
|
|
// create a new slice 1 rune larger
|
|
rv := make([]rune, len(in)+1)
|
|
// copy the characters before the insert pos
|
|
copy(rv[0:pos], in[0:pos])
|
|
// set the inserted rune
|
|
rv[pos] = r
|
|
// copy the characters after the insert pos
|
|
copy(rv[pos+1:], in[pos:])
|
|
return rv
|
|
}
|
|
|
|
// BuildTermFromRunesOptimistic will build a term from the provided runes
|
|
// AND optimistically attempt to encode into the provided buffer
|
|
// if at any point it appears the buffer is too small, a new buffer is
|
|
// allocated and that is used instead
|
|
// this should be used in cases where frequently the new term is the same
|
|
// length or shorter than the original term (in number of bytes)
|
|
func BuildTermFromRunesOptimistic(buf []byte, runes []rune) []byte {
|
|
rv := buf
|
|
used := 0
|
|
for _, r := range runes {
|
|
nextLen := utf8.RuneLen(r)
|
|
if used+nextLen > len(rv) {
|
|
// alloc new buf
|
|
buf = make([]byte, len(runes)*utf8.UTFMax)
|
|
// copy work we've already done
|
|
copy(buf, rv[:used])
|
|
rv = buf
|
|
}
|
|
written := utf8.EncodeRune(rv[used:], r)
|
|
used += written
|
|
}
|
|
return rv[:used]
|
|
}
|
|
|
|
func BuildTermFromRunes(runes []rune) []byte {
|
|
return BuildTermFromRunesOptimistic(make([]byte, len(runes)*utf8.UTFMax), runes)
|
|
}
|
|
|
|
func TruncateRunes(input []byte, num int) []byte {
|
|
runes := bytes.Runes(input)
|
|
runes = runes[:len(runes)-num]
|
|
out := BuildTermFromRunes(runes)
|
|
return out
|
|
}
|
|
|
|
func RunesEndsWith(input []rune, suffix string) bool {
|
|
inputLen := len(input)
|
|
suffixRunes := []rune(suffix)
|
|
suffixLen := len(suffixRunes)
|
|
if suffixLen > inputLen {
|
|
return false
|
|
}
|
|
|
|
for i := suffixLen - 1; i >= 0; i-- {
|
|
if input[inputLen-(suffixLen-i)] != suffixRunes[i] {
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|