// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package doc
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import (
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"os"
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"regexp"
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"strings"
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"sync"
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)
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type lazyRE struct {
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str string
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once sync.Once
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rx *regexp.Regexp
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}
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func (r *lazyRE) re() *regexp.Regexp {
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r.once.Do(r.build)
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return r.rx
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}
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func (r *lazyRE) build() {
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r.rx = regexp.MustCompile(r.str)
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r.str = ""
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}
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func (r *lazyRE) FindStringSubmatchIndex(s string) []int {
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return r.re().FindStringSubmatchIndex(s)
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}
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func (r *lazyRE) ReplaceAllString(src, repl string) string {
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return r.re().ReplaceAllString(src, repl)
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}
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func (r *lazyRE) MatchString(s string) bool {
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return r.re().MatchString(s)
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}
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var inTest = len(os.Args) > 0 && strings.HasSuffix(strings.TrimSuffix(os.Args[0], ".exe"), ".test")
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func newLazyRE(str string) *lazyRE {
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lr := &lazyRE{str: str}
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if inTest {
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// In tests, always compile the regexps early.
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lr.re()
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}
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return lr
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}
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