mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-07 20:30:36 -05:00
cdfd1c99ba
Go stdlib doesn't contain a limited replace in the regexp package, but we can accomplish the same thing with ReplaceAllStringFunc. Fixes #7586
125 lines
2.9 KiB
Go
125 lines
2.9 KiB
Go
// Copyright 2017 The Hugo Authors. 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 strings
|
|
|
|
import (
|
|
"regexp"
|
|
"sync"
|
|
|
|
"github.com/spf13/cast"
|
|
)
|
|
|
|
// FindRE returns a list of strings that match the regular expression. By default all matches
|
|
// will be included. The number of matches can be limited with an optional third parameter.
|
|
func (ns *Namespace) FindRE(expr string, content interface{}, limit ...interface{}) ([]string, error) {
|
|
re, err := reCache.Get(expr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
conv, err := cast.ToStringE(content)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if len(limit) == 0 {
|
|
return re.FindAllString(conv, -1), nil
|
|
}
|
|
|
|
lim, err := cast.ToIntE(limit[0])
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return re.FindAllString(conv, lim), nil
|
|
}
|
|
|
|
// ReplaceRE returns a copy of s, replacing all matches of the regular
|
|
// expression pattern with the replacement text repl. The number of replacements
|
|
// can be limited with an optional fourth parameter.
|
|
func (ns *Namespace) ReplaceRE(pattern, repl, s interface{}, n ...interface{}) (_ string, err error) {
|
|
sp, err := cast.ToStringE(pattern)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
sr, err := cast.ToStringE(repl)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
ss, err := cast.ToStringE(s)
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
nn := -1
|
|
if len(n) > 0 {
|
|
nn, err = cast.ToIntE(n[0])
|
|
if err != nil {
|
|
return
|
|
}
|
|
}
|
|
|
|
re, err := reCache.Get(sp)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
return re.ReplaceAllStringFunc(ss, func(str string) string {
|
|
if nn == 0 {
|
|
return str
|
|
}
|
|
|
|
nn -= 1
|
|
return re.ReplaceAllString(str, sr)
|
|
}), nil
|
|
}
|
|
|
|
// regexpCache represents a cache of regexp objects protected by a mutex.
|
|
type regexpCache struct {
|
|
mu sync.RWMutex
|
|
re map[string]*regexp.Regexp
|
|
}
|
|
|
|
// Get retrieves a regexp object from the cache based upon the pattern.
|
|
// If the pattern is not found in the cache, create one
|
|
func (rc *regexpCache) Get(pattern string) (re *regexp.Regexp, err error) {
|
|
var ok bool
|
|
|
|
if re, ok = rc.get(pattern); !ok {
|
|
re, err = regexp.Compile(pattern)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
rc.set(pattern, re)
|
|
}
|
|
|
|
return re, nil
|
|
}
|
|
|
|
func (rc *regexpCache) get(key string) (re *regexp.Regexp, ok bool) {
|
|
rc.mu.RLock()
|
|
re, ok = rc.re[key]
|
|
rc.mu.RUnlock()
|
|
return
|
|
}
|
|
|
|
func (rc *regexpCache) set(key string, re *regexp.Regexp) {
|
|
rc.mu.Lock()
|
|
rc.re[key] = re
|
|
rc.mu.Unlock()
|
|
}
|
|
|
|
var reCache = regexpCache{re: make(map[string]*regexp.Regexp)}
|