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https://github.com/gohugoio/hugo.git
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cdfd1c99ba
Go stdlib doesn't contain a limited replace in the regexp package, but we can accomplish the same thing with ReplaceAllStringFunc. Fixes #7586
126 lines
2.9 KiB
Go
126 lines
2.9 KiB
Go
// Copyright 2017 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package strings
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import (
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"regexp"
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"sync"
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"github.com/spf13/cast"
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)
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// FindRE returns a list of strings that match the regular expression. By default all matches
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// will be included. The number of matches can be limited with an optional third parameter.
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func (ns *Namespace) FindRE(expr string, content interface{}, limit ...interface{}) ([]string, error) {
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re, err := reCache.Get(expr)
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if err != nil {
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return nil, err
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}
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conv, err := cast.ToStringE(content)
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if err != nil {
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return nil, err
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}
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if len(limit) == 0 {
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return re.FindAllString(conv, -1), nil
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}
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lim, err := cast.ToIntE(limit[0])
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if err != nil {
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return nil, err
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}
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return re.FindAllString(conv, lim), nil
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}
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// ReplaceRE returns a copy of s, replacing all matches of the regular
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// expression pattern with the replacement text repl. The number of replacements
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// can be limited with an optional fourth parameter.
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func (ns *Namespace) ReplaceRE(pattern, repl, s interface{}, n ...interface{}) (_ string, err error) {
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sp, err := cast.ToStringE(pattern)
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if err != nil {
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return
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}
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sr, err := cast.ToStringE(repl)
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if err != nil {
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return
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}
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ss, err := cast.ToStringE(s)
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if err != nil {
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return
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}
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nn := -1
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if len(n) > 0 {
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nn, err = cast.ToIntE(n[0])
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if err != nil {
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return
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}
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}
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re, err := reCache.Get(sp)
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if err != nil {
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return "", err
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}
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return re.ReplaceAllStringFunc(ss, func(str string) string {
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if nn == 0 {
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return str
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}
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nn -= 1
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return re.ReplaceAllString(str, sr)
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}), nil
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}
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// regexpCache represents a cache of regexp objects protected by a mutex.
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type regexpCache struct {
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mu sync.RWMutex
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re map[string]*regexp.Regexp
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}
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// Get retrieves a regexp object from the cache based upon the pattern.
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// If the pattern is not found in the cache, create one
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func (rc *regexpCache) Get(pattern string) (re *regexp.Regexp, err error) {
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var ok bool
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if re, ok = rc.get(pattern); !ok {
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re, err = regexp.Compile(pattern)
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if err != nil {
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return nil, err
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}
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rc.set(pattern, re)
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}
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return re, nil
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}
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func (rc *regexpCache) get(key string) (re *regexp.Regexp, ok bool) {
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rc.mu.RLock()
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re, ok = rc.re[key]
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rc.mu.RUnlock()
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return
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}
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func (rc *regexpCache) set(key string, re *regexp.Regexp) {
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rc.mu.Lock()
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rc.re[key] = re
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rc.mu.Unlock()
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}
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var reCache = regexpCache{re: make(map[string]*regexp.Regexp)}
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