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internal/lazytemplate: add a lazy template wrapper
Similar to internal/lazyregexp, this will allow removing unnecessary work from init functions with trivial refactors, thanks to sync.Once. Copy the structure. The only major difference is that a template also carries a name. For #29382. Change-Id: I65d096dc2e2072b310bf59a814cd62669856b5b5 Reviewed-on: https://go-review.googlesource.com/c/164337 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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@ -194,11 +194,12 @@ var pkgDeps = map[string][]string{
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"runtime/trace": {"L0", "context", "fmt"},
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"runtime/trace": {"L0", "context", "fmt"},
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"text/tabwriter": {"L2"},
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"text/tabwriter": {"L2"},
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"testing": {"L2", "flag", "fmt", "internal/race", "os", "runtime/debug", "runtime/pprof", "runtime/trace", "time"},
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"testing": {"L2", "flag", "fmt", "internal/race", "os", "runtime/debug", "runtime/pprof", "runtime/trace", "time"},
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"testing/iotest": {"L2", "log"},
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"testing/iotest": {"L2", "log"},
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"testing/quick": {"L2", "flag", "fmt", "reflect", "time"},
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"testing/quick": {"L2", "flag", "fmt", "reflect", "time"},
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"internal/testenv": {"L2", "OS", "flag", "testing", "syscall"},
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"internal/testenv": {"L2", "OS", "flag", "testing", "syscall"},
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"internal/lazyregexp": {"L2", "OS", "regexp"},
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"internal/lazyregexp": {"L2", "OS", "regexp"},
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"internal/lazytemplate": {"L2", "OS", "text/template"},
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// L4 is defined as L3+fmt+log+time, because in general once
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// L4 is defined as L3+fmt+log+time, because in general once
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// you're using L3 packages, use of fmt, log, or time is not a big deal.
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// you're using L3 packages, use of fmt, log, or time is not a big deal.
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@ -2,6 +2,8 @@
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// Use of this source code is governed by a BSD-style
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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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// license that can be found in the LICENSE file.
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// Package lazyregexp is a thin wrapper over regexp, allowing the use of global
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// regexp variables without forcing them to be compiled at init.
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package lazyregexp
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package lazyregexp
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import (
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import (
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@ -11,6 +13,8 @@ import (
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"sync"
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"sync"
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)
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)
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// Regexp is a wrapper around regexp.Regexp, where the underlying regexp will be
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// compiled the first time it is needed.
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type Regexp struct {
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type Regexp struct {
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str string
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str string
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once sync.Once
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once sync.Once
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@ -61,6 +65,9 @@ func (r *Regexp) SubexpNames() []string {
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var inTest = len(os.Args) > 0 && strings.HasSuffix(strings.TrimSuffix(os.Args[0], ".exe"), ".test")
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var inTest = len(os.Args) > 0 && strings.HasSuffix(strings.TrimSuffix(os.Args[0], ".exe"), ".test")
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// New creates a new lazy regexp, delaying the compiling work until it is first
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// needed. If the code is being run as part of tests, the regexp compiling will
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// happen immediately.
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func New(str string) *Regexp {
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func New(str string) *Regexp {
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lr := &Regexp{str: str}
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lr := &Regexp{str: str}
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if inTest {
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if inTest {
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52
src/internal/lazytemplate/lazytemplate.go
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52
src/internal/lazytemplate/lazytemplate.go
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@ -0,0 +1,52 @@
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// Copyright 2019 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 lazytemplate is a thin wrapper over text/template, allowing the use
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// of global template variables without forcing them to be parsed at init.
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package lazytemplate
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import (
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"io"
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"os"
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"strings"
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"sync"
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"text/template"
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)
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// Template is a wrapper around text/template.Template, where the underlying
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// template will be parsed the first time it is needed.
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type Template struct {
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name, text string
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once sync.Once
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tmpl *template.Template
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}
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func (r *Template) tp() *template.Template {
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r.once.Do(r.build)
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return r.tmpl
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}
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func (r *Template) build() {
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r.tmpl = template.Must(template.New(r.name).Parse(r.text))
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r.name, r.text = "", ""
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}
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func (r *Template) Execute(w io.Writer, data interface{}) error {
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return r.tp().Execute(w, data)
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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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// New creates a new lazy template, delaying the parsing work until it is first
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// needed. If the code is being run as part of tests, the template parsing will
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// happen immediately.
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func New(name, text string) *Template {
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lt := &Template{name: name, text: text}
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if inTest {
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// In tests, always parse the templates early.
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lt.tp()
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}
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return lt
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}
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