From 73df946d56c74384511a194dd01dbe099584fd1a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 28 Apr 2024 15:14:23 +0200 Subject: Adding upstream version 1.16.10. Signed-off-by: Daniel Baumann --- src/internal/lazytemplate/lazytemplate.go | 52 +++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 src/internal/lazytemplate/lazytemplate.go (limited to 'src/internal/lazytemplate/lazytemplate.go') diff --git a/src/internal/lazytemplate/lazytemplate.go b/src/internal/lazytemplate/lazytemplate.go new file mode 100644 index 0000000..c83eaea --- /dev/null +++ b/src/internal/lazytemplate/lazytemplate.go @@ -0,0 +1,52 @@ +// Copyright 2019 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// Package lazytemplate is a thin wrapper over text/template, allowing the use +// of global template variables without forcing them to be parsed at init. +package lazytemplate + +import ( + "io" + "os" + "strings" + "sync" + "text/template" +) + +// Template is a wrapper around text/template.Template, where the underlying +// template will be parsed the first time it is needed. +type Template struct { + name, text string + + once sync.Once + tmpl *template.Template +} + +func (r *Template) tp() *template.Template { + r.once.Do(r.build) + return r.tmpl +} + +func (r *Template) build() { + r.tmpl = template.Must(template.New(r.name).Parse(r.text)) + r.name, r.text = "", "" +} + +func (r *Template) Execute(w io.Writer, data interface{}) error { + return r.tp().Execute(w, data) +} + +var inTest = len(os.Args) > 0 && strings.HasSuffix(strings.TrimSuffix(os.Args[0], ".exe"), ".test") + +// New creates a new lazy template, delaying the parsing work until it is first +// needed. If the code is being run as part of tests, the template parsing will +// happen immediately. +func New(name, text string) *Template { + lt := &Template{name: name, text: text} + if inTest { + // In tests, always parse the templates early. + lt.tp() + } + return lt +} -- cgit v1.2.3