mirror of
https://github.com/golang/go
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template: delete old template code.
It's already in old/template; make that build. Update a couple of references to point to the old template. They can be updated later. Update goplay to use exp/template. R=golang-dev, dsymonds CC=golang-dev https://golang.org/cl/4902046
This commit is contained in:
Rob Pike
parent
ff0240da6d
commit
73b7afbebd
@ -3,9 +3,9 @@ package main
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import (
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"http"
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"io/ioutil"
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"old/template"
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"os"
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"regexp"
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"template"
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)
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type Page struct {
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@ -3,8 +3,8 @@ package main
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import (
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"http"
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"io/ioutil"
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"old/template"
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"os"
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"template"
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)
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type Page struct {
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@ -3,9 +3,9 @@ package main
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import (
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"http"
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"io/ioutil"
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"old/template"
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"os"
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"regexp"
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"template"
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)
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type Page struct {
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@ -1,8 +1,8 @@
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package main
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import (
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"old/template"
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"os"
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"template"
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"io/ioutil"
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)
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@ -7,7 +7,7 @@ Covered in this codelab:
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<ul>
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<li>Creating a data structure with load and save methods</li>
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<li>Using the <code>http</code> package to build web applications
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<li>Using the <code>template</code> package to process HTML templates</li>
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<li>Using the <code>old/template</code> package to process HTML templates</li>
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<li>Using the <code>regexp</code> package to validate user input</li>
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<li>Using closures</li>
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</ul>
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@ -426,25 +426,27 @@ This function will work fine, but all that hard-coded HTML is ugly.
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Of course, there is a better way.
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</p>
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<h2>The <code>template</code> package</h2>
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<h2>The <code>old/template</code> package</h2>
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<p>
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The <code>template</code> package is part of the Go standard library. We can
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use <code>template</code> to keep the HTML in a separate file, allowing
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The <code>old/template</code> package is part of the Go standard library.
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(A new template package is coming; this code lab will be updated soon.)
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We can
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use <code>old/template</code> to keep the HTML in a separate file, allowing
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us to change the layout of our edit page without modifying the underlying Go
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code.
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</p>
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<p>
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First, we must add <code>template</code> to the list of imports:
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First, we must add <code>old/template</code> to the list of imports:
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</p>
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<pre>
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import (
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"http"
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"io/ioutil"
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<b>"old/template"</b>
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"os"
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<b>"template"</b>
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)
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</pre>
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@ -8,8 +8,8 @@ import (
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"go/ast"
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"go/token"
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"log"
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"old/template"
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"os"
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"template"
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)
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var (
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@ -7,7 +7,7 @@ Covered in this codelab:
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<ul>
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<li>Creating a data structure with load and save methods</li>
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<li>Using the <code>http</code> package to build web applications
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<li>Using the <code>template</code> package to process HTML templates</li>
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<li>Using the <code>old/template</code> package to process HTML templates</li>
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<li>Using the <code>regexp</code> package to validate user input</li>
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<li>Using closures</li>
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</ul>
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@ -366,25 +366,27 @@ This function will work fine, but all that hard-coded HTML is ugly.
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Of course, there is a better way.
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</p>
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<h2>The <code>template</code> package</h2>
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<h2>The <code>old/template</code> package</h2>
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<p>
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The <code>template</code> package is part of the Go standard library. We can
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use <code>template</code> to keep the HTML in a separate file, allowing
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The <code>old/template</code> package is part of the Go standard library.
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(A new template package is coming; this code lab will be updated soon.)
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We can
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use <code>old/template</code> to keep the HTML in a separate file, allowing
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us to change the layout of our edit page without modifying the underlying Go
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code.
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</p>
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<p>
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First, we must add <code>template</code> to the list of imports:
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First, we must add <code>old/template</code> to the list of imports:
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</p>
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<pre>
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import (
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"http"
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"io/ioutil"
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<b>"old/template"</b>
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"os"
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<b>"template"</b>
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)
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</pre>
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@ -2926,7 +2926,7 @@ import (
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"http"
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"io"
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"log"
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"template"
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"old/template" // New template package coming soon...
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)
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var addr = flag.String("addr", ":1718", "http service address") // Q=17, R=18
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@ -14,7 +14,7 @@ import (
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"os"
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"runtime"
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"strconv"
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"template"
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"exp/template"
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)
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var (
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@ -142,18 +142,10 @@ func run(cmd ...string) ([]byte, os.Error) {
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return exec.Command(cmd[0], cmd[1:]...).CombinedOutput()
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}
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var frontPage, output *template.Template // HTML templates
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var frontPage = template.Must(template.New("frontPage").Parse(frontPageText)) // HTML template
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var output = template.Must(template.New("output").Parse(outputText)) // HTML template
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func init() {
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frontPage = template.New(nil)
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frontPage.SetDelims("«", "»")
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if err := frontPage.Parse(frontPageText); err != nil {
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panic(err)
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}
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output = template.MustParse(outputText, nil)
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}
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var outputText = `<pre>{@|html}</pre>`
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var outputText = `<pre>{{html .}}</pre>`
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var frontPageText = `<!doctype html>
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<html>
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@ -264,7 +256,7 @@ function compileUpdate() {
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</head>
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<body>
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<table width="100%"><tr><td width="60%" valign="top">
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<textarea autofocus="true" id="edit" spellcheck="false" onkeydown="keyHandler(event);" onkeyup="autocompile();">«@|html»</textarea>
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<textarea autofocus="true" id="edit" spellcheck="false" onkeydown="keyHandler(event);" onkeyup="autocompile();">{{html .}}</textarea>
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<div class="hints">
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(Shift-Enter to compile and run.)
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<input type="checkbox" id="autocompile" value="checked" /> Compile and run after each keystroke
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@ -131,6 +131,7 @@ DIRS=\
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net/dict\
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net/textproto\
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netchan\
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old/template\
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os\
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os/signal\
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os/user\
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@ -156,7 +157,6 @@ DIRS=\
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syscall\
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syslog\
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tabwriter\
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template\
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testing\
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testing/iotest\
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testing/quick\
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@ -2,7 +2,7 @@
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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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include ../../Make.inc
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include ../../../Make.inc
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TARG=old/template
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GOFILES=\
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@ -11,4 +11,4 @@ GOFILES=\
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format.go\
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parse.go\
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include ../../Make.pkg
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include ../../../Make.pkg
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@ -1,14 +0,0 @@
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# Copyright 2009 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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include ../../Make.inc
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TARG=template
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GOFILES=\
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doc.go\
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execute.go\
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format.go\
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parse.go\
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include ../../Make.pkg
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@ -1,91 +0,0 @@
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// Copyright 2009 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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/*
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Package template implements data-driven templates for generating textual
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output such as HTML.
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Templates are executed by applying them to a data structure.
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Annotations in the template refer to elements of the data
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structure (typically a field of a struct or a key in a map)
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to control execution and derive values to be displayed.
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The template walks the structure as it executes and the
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"cursor" @ represents the value at the current location
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in the structure.
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Data items may be values or pointers; the interface hides the
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indirection.
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In the following, 'Field' is one of several things, according to the data.
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- The name of a field of a struct (result = data.Field),
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- The value stored in a map under that key (result = data["Field"]), or
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- The result of invoking a niladic single-valued method with that name
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(result = data.Field())
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If Field is a struct field or method name, it must be an exported
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(capitalized) name.
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Major constructs ({} are the default delimiters for template actions;
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[] are the notation in this comment for optional elements):
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{# comment }
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A one-line comment.
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{.section field} XXX [ {.or} YYY ] {.end}
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Set @ to the value of the field. It may be an explicit @
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to stay at the same point in the data. If the field is nil
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or empty, execute YYY; otherwise execute XXX.
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{.repeated section field} XXX [ {.alternates with} ZZZ ] [ {.or} YYY ] {.end}
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Like .section, but field must be an array or slice. XXX
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is executed for each element. If the array is nil or empty,
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YYY is executed instead. If the {.alternates with} marker
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is present, ZZZ is executed between iterations of XXX.
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{field}
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{field1 field2 ...}
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{field|formatter}
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{field1 field2...|formatter}
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{field|formatter1|formatter2}
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Insert the value of the fields into the output. Each field is
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first looked for in the cursor, as in .section and .repeated.
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If it is not found, the search continues in outer sections
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until the top level is reached.
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If the field value is a pointer, leading asterisks indicate
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that the value to be inserted should be evaluated through the
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pointer. For example, if x.p is of type *int, {x.p} will
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insert the value of the pointer but {*x.p} will insert the
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value of the underlying integer. If the value is nil or not a
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pointer, asterisks have no effect.
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If a formatter is specified, it must be named in the formatter
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map passed to the template set up routines or in the default
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set ("html","str","") and is used to process the data for
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output. The formatter function has signature
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func(wr io.Writer, formatter string, data ...interface{})
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where wr is the destination for output, data holds the field
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values at the instantiation, and formatter is its name at
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the invocation site. The default formatter just concatenates
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the string representations of the fields.
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Multiple formatters separated by the pipeline character | are
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executed sequentially, with each formatter receiving the bytes
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emitted by the one to its left.
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As well as field names, one may use literals with Go syntax.
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Integer, floating-point, and string literals are supported.
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Raw strings may not span newlines.
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The delimiter strings get their default value, "{" and "}", from
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JSON-template. They may be set to any non-empty, space-free
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string using the SetDelims method. Their value can be printed
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in the output using {.meta-left} and {.meta-right}.
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*/
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package template
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@ -1,346 +0,0 @@
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// Copyright 2009 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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// Code to execute a parsed template.
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package template
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import (
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"bytes"
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"io"
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"reflect"
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"strings"
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)
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// Internal state for executing a Template. As we evaluate the struct,
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// the data item descends into the fields associated with sections, etc.
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// Parent is used to walk upwards to find variables higher in the tree.
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type state struct {
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parent *state // parent in hierarchy
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data reflect.Value // the driver data for this section etc.
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wr io.Writer // where to send output
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buf [2]bytes.Buffer // alternating buffers used when chaining formatters
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}
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func (parent *state) clone(data reflect.Value) *state {
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return &state{parent: parent, data: data, wr: parent.wr}
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}
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// Evaluate interfaces and pointers looking for a value that can look up the name, via a
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// struct field, method, or map key, and return the result of the lookup.
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func (t *Template) lookup(st *state, v reflect.Value, name string) reflect.Value {
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for v.IsValid() {
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typ := v.Type()
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if n := v.Type().NumMethod(); n > 0 {
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for i := 0; i < n; i++ {
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m := typ.Method(i)
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mtyp := m.Type
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if m.Name == name && mtyp.NumIn() == 1 && mtyp.NumOut() == 1 {
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if !isExported(name) {
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t.execError(st, t.linenum, "name not exported: %s in type %s", name, st.data.Type())
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}
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return v.Method(i).Call(nil)[0]
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}
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}
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}
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switch av := v; av.Kind() {
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case reflect.Ptr:
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v = av.Elem()
|
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case reflect.Interface:
|
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v = av.Elem()
|
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case reflect.Struct:
|
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if !isExported(name) {
|
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t.execError(st, t.linenum, "name not exported: %s in type %s", name, st.data.Type())
|
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}
|
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return av.FieldByName(name)
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case reflect.Map:
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if v := av.MapIndex(reflect.ValueOf(name)); v.IsValid() {
|
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return v
|
||||
}
|
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return reflect.Zero(typ.Elem())
|
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default:
|
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return reflect.Value{}
|
||||
}
|
||||
}
|
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return v
|
||||
}
|
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|
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// indirectPtr returns the item numLevels levels of indirection below the value.
|
||||
// It is forgiving: if the value is not a pointer, it returns it rather than giving
|
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// an error. If the pointer is nil, it is returned as is.
|
||||
func indirectPtr(v reflect.Value, numLevels int) reflect.Value {
|
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for i := numLevels; v.IsValid() && i > 0; i++ {
|
||||
if p := v; p.Kind() == reflect.Ptr {
|
||||
if p.IsNil() {
|
||||
return v
|
||||
}
|
||||
v = p.Elem()
|
||||
} else {
|
||||
break
|
||||
}
|
||||
}
|
||||
return v
|
||||
}
|
||||
|
||||
// Walk v through pointers and interfaces, extracting the elements within.
|
||||
func indirect(v reflect.Value) reflect.Value {
|
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loop:
|
||||
for v.IsValid() {
|
||||
switch av := v; av.Kind() {
|
||||
case reflect.Ptr:
|
||||
v = av.Elem()
|
||||
case reflect.Interface:
|
||||
v = av.Elem()
|
||||
default:
|
||||
break loop
|
||||
}
|
||||
}
|
||||
return v
|
||||
}
|
||||
|
||||
// If the data for this template is a struct, find the named variable.
|
||||
// Names of the form a.b.c are walked down the data tree.
|
||||
// The special name "@" (the "cursor") denotes the current data.
|
||||
// The value coming in (st.data) might need indirecting to reach
|
||||
// a struct while the return value is not indirected - that is,
|
||||
// it represents the actual named field. Leading stars indicate
|
||||
// levels of indirection to be applied to the value.
|
||||
func (t *Template) findVar(st *state, s string) reflect.Value {
|
||||
data := st.data
|
||||
flattenedName := strings.TrimLeft(s, "*")
|
||||
numStars := len(s) - len(flattenedName)
|
||||
s = flattenedName
|
||||
if s == "@" {
|
||||
return indirectPtr(data, numStars)
|
||||
}
|
||||
for _, elem := range strings.Split(s, ".") {
|
||||
// Look up field; data must be a struct or map.
|
||||
data = t.lookup(st, data, elem)
|
||||
if !data.IsValid() {
|
||||
return reflect.Value{}
|
||||
}
|
||||
}
|
||||
return indirectPtr(data, numStars)
|
||||
}
|
||||
|
||||
// Is there no data to look at?
|
||||
func empty(v reflect.Value) bool {
|
||||
v = indirect(v)
|
||||
if !v.IsValid() {
|
||||
return true
|
||||
}
|
||||
switch v.Kind() {
|
||||
case reflect.Bool:
|
||||
return v.Bool() == false
|
||||
case reflect.String:
|
||||
return v.String() == ""
|
||||
case reflect.Struct:
|
||||
return false
|
||||
case reflect.Map:
|
||||
return false
|
||||
case reflect.Array:
|
||||
return v.Len() == 0
|
||||
case reflect.Slice:
|
||||
return v.Len() == 0
|
||||
}
|
||||
return false
|
||||
}
|
||||
|
||||
// Look up a variable or method, up through the parent if necessary.
|
||||
func (t *Template) varValue(name string, st *state) reflect.Value {
|
||||
field := t.findVar(st, name)
|
||||
if !field.IsValid() {
|
||||
if st.parent == nil {
|
||||
t.execError(st, t.linenum, "name not found: %s in type %s", name, st.data.Type())
|
||||
}
|
||||
return t.varValue(name, st.parent)
|
||||
}
|
||||
return field
|
||||
}
|
||||
|
||||
func (t *Template) format(wr io.Writer, fmt string, val []interface{}, v *variableElement, st *state) {
|
||||
fn := t.formatter(fmt)
|
||||
if fn == nil {
|
||||
t.execError(st, v.linenum, "missing formatter %s for variable", fmt)
|
||||
}
|
||||
fn(wr, fmt, val...)
|
||||
}
|
||||
|
||||
// Evaluate a variable, looking up through the parent if necessary.
|
||||
// If it has a formatter attached ({var|formatter}) run that too.
|
||||
func (t *Template) writeVariable(v *variableElement, st *state) {
|
||||
// Resolve field names
|
||||
val := make([]interface{}, len(v.args))
|
||||
for i, arg := range v.args {
|
||||
if name, ok := arg.(fieldName); ok {
|
||||
val[i] = t.varValue(string(name), st).Interface()
|
||||
} else {
|
||||
val[i] = arg
|
||||
}
|
||||
}
|
||||
for i, fmt := range v.fmts[:len(v.fmts)-1] {
|
||||
b := &st.buf[i&1]
|
||||
b.Reset()
|
||||
t.format(b, fmt, val, v, st)
|
||||
val = val[0:1]
|
||||
val[0] = b.Bytes()
|
||||
}
|
||||
t.format(st.wr, v.fmts[len(v.fmts)-1], val, v, st)
|
||||
}
|
||||
|
||||
// Execute element i. Return next index to execute.
|
||||
func (t *Template) executeElement(i int, st *state) int {
|
||||
switch elem := t.elems[i].(type) {
|
||||
case *textElement:
|
||||
st.wr.Write(elem.text)
|
||||
return i + 1
|
||||
case *literalElement:
|
||||
st.wr.Write(elem.text)
|
||||
return i + 1
|
||||
case *variableElement:
|
||||
t.writeVariable(elem, st)
|
||||
return i + 1
|
||||
case *sectionElement:
|
||||
t.executeSection(elem, st)
|
||||
return elem.end
|
||||
case *repeatedElement:
|
||||
t.executeRepeated(elem, st)
|
||||
return elem.end
|
||||
}
|
||||
e := t.elems[i]
|
||||
t.execError(st, 0, "internal error: bad directive in execute: %v %T\n", reflect.ValueOf(e).Interface(), e)
|
||||
return 0
|
||||
}
|
||||
|
||||
// Execute the template.
|
||||
func (t *Template) execute(start, end int, st *state) {
|
||||
for i := start; i < end; {
|
||||
i = t.executeElement(i, st)
|
||||
}
|
||||
}
|
||||
|
||||
// Execute a .section
|
||||
func (t *Template) executeSection(s *sectionElement, st *state) {
|
||||
// Find driver data for this section. It must be in the current struct.
|
||||
field := t.varValue(s.field, st)
|
||||
if !field.IsValid() {
|
||||
t.execError(st, s.linenum, ".section: cannot find field %s in %s", s.field, st.data.Type())
|
||||
}
|
||||
st = st.clone(field)
|
||||
start, end := s.start, s.or
|
||||
if !empty(field) {
|
||||
// Execute the normal block.
|
||||
if end < 0 {
|
||||
end = s.end
|
||||
}
|
||||
} else {
|
||||
// Execute the .or block. If it's missing, do nothing.
|
||||
start, end = s.or, s.end
|
||||
if start < 0 {
|
||||
return
|
||||
}
|
||||
}
|
||||
for i := start; i < end; {
|
||||
i = t.executeElement(i, st)
|
||||
}
|
||||
}
|
||||
|
||||
// Return the result of calling the Iter method on v, or nil.
|
||||
func iter(v reflect.Value) reflect.Value {
|
||||
for j := 0; j < v.Type().NumMethod(); j++ {
|
||||
mth := v.Type().Method(j)
|
||||
fv := v.Method(j)
|
||||
ft := fv.Type()
|
||||
// TODO(rsc): NumIn() should return 0 here, because ft is from a curried FuncValue.
|
||||
if mth.Name != "Iter" || ft.NumIn() != 1 || ft.NumOut() != 1 {
|
||||
continue
|
||||
}
|
||||
ct := ft.Out(0)
|
||||
if ct.Kind() != reflect.Chan ||
|
||||
ct.ChanDir()&reflect.RecvDir == 0 {
|
||||
continue
|
||||
}
|
||||
return fv.Call(nil)[0]
|
||||
}
|
||||
return reflect.Value{}
|
||||
}
|
||||
|
||||
// Execute a .repeated section
|
||||
func (t *Template) executeRepeated(r *repeatedElement, st *state) {
|
||||
// Find driver data for this section. It must be in the current struct.
|
||||
field := t.varValue(r.field, st)
|
||||
if !field.IsValid() {
|
||||
t.execError(st, r.linenum, ".repeated: cannot find field %s in %s", r.field, st.data.Type())
|
||||
}
|
||||
field = indirect(field)
|
||||
|
||||
start, end := r.start, r.or
|
||||
if end < 0 {
|
||||
end = r.end
|
||||
}
|
||||
if r.altstart >= 0 {
|
||||
end = r.altstart
|
||||
}
|
||||
first := true
|
||||
|
||||
// Code common to all the loops.
|
||||
loopBody := func(newst *state) {
|
||||
// .alternates between elements
|
||||
if !first && r.altstart >= 0 {
|
||||
for i := r.altstart; i < r.altend; {
|
||||
i = t.executeElement(i, newst)
|
||||
}
|
||||
}
|
||||
first = false
|
||||
for i := start; i < end; {
|
||||
i = t.executeElement(i, newst)
|
||||
}
|
||||
}
|
||||
|
||||
if array := field; array.Kind() == reflect.Array || array.Kind() == reflect.Slice {
|
||||
for j := 0; j < array.Len(); j++ {
|
||||
loopBody(st.clone(array.Index(j)))
|
||||
}
|
||||
} else if m := field; m.Kind() == reflect.Map {
|
||||
for _, key := range m.MapKeys() {
|
||||
loopBody(st.clone(m.MapIndex(key)))
|
||||
}
|
||||
} else if ch := iter(field); ch.IsValid() {
|
||||
for {
|
||||
e, ok := ch.Recv()
|
||||
if !ok {
|
||||
break
|
||||
}
|
||||
loopBody(st.clone(e))
|
||||
}
|
||||
} else {
|
||||
t.execError(st, r.linenum, ".repeated: cannot repeat %s (type %s)",
|
||||
r.field, field.Type())
|
||||
}
|
||||
|
||||
if first {
|
||||
// Empty. Execute the .or block, once. If it's missing, do nothing.
|
||||
start, end := r.or, r.end
|
||||
if start >= 0 {
|
||||
newst := st.clone(field)
|
||||
for i := start; i < end; {
|
||||
i = t.executeElement(i, newst)
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
// A valid delimiter must contain no space and be non-empty.
|
||||
func validDelim(d []byte) bool {
|
||||
if len(d) == 0 {
|
||||
return false
|
||||
}
|
||||
for _, c := range d {
|
||||
if isSpace(c) {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
@ -1,77 +0,0 @@
|
||||
// Copyright 2009 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.
|
||||
|
||||
// Template library: default formatters
|
||||
|
||||
package template
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"fmt"
|
||||
"io"
|
||||
)
|
||||
|
||||
// StringFormatter formats into the default string representation.
|
||||
// It is stored under the name "str" and is the default formatter.
|
||||
// You can override the default formatter by storing your default
|
||||
// under the name "" in your custom formatter map.
|
||||
func StringFormatter(w io.Writer, format string, value ...interface{}) {
|
||||
if len(value) == 1 {
|
||||
if b, ok := value[0].([]byte); ok {
|
||||
w.Write(b)
|
||||
return
|
||||
}
|
||||
}
|
||||
fmt.Fprint(w, value...)
|
||||
}
|
||||
|
||||
var (
|
||||
esc_quot = []byte(""") // shorter than """
|
||||
esc_apos = []byte("'") // shorter than "'"
|
||||
esc_amp = []byte("&")
|
||||
esc_lt = []byte("<")
|
||||
esc_gt = []byte(">")
|
||||
)
|
||||
|
||||
// HTMLEscape writes to w the properly escaped HTML equivalent
|
||||
// of the plain text data s.
|
||||
func HTMLEscape(w io.Writer, s []byte) {
|
||||
var esc []byte
|
||||
last := 0
|
||||
for i, c := range s {
|
||||
switch c {
|
||||
case '"':
|
||||
esc = esc_quot
|
||||
case '\'':
|
||||
esc = esc_apos
|
||||
case '&':
|
||||
esc = esc_amp
|
||||
case '<':
|
||||
esc = esc_lt
|
||||
case '>':
|
||||
esc = esc_gt
|
||||
default:
|
||||
continue
|
||||
}
|
||||
w.Write(s[last:i])
|
||||
w.Write(esc)
|
||||
last = i + 1
|
||||
}
|
||||
w.Write(s[last:])
|
||||
}
|
||||
|
||||
// HTMLFormatter formats arbitrary values for HTML
|
||||
func HTMLFormatter(w io.Writer, format string, value ...interface{}) {
|
||||
ok := false
|
||||
var b []byte
|
||||
if len(value) == 1 {
|
||||
b, ok = value[0].([]byte)
|
||||
}
|
||||
if !ok {
|
||||
var buf bytes.Buffer
|
||||
fmt.Fprint(&buf, value...)
|
||||
b = buf.Bytes()
|
||||
}
|
||||
HTMLEscape(w, b)
|
||||
}
|
||||
@ -1,743 +0,0 @@
|
||||
// Copyright 2009 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.
|
||||
|
||||
// Code to parse a template.
|
||||
|
||||
package template
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"reflect"
|
||||
"strconv"
|
||||
"strings"
|
||||
"unicode"
|
||||
"utf8"
|
||||
)
|
||||
|
||||
// Errors returned during parsing and execution. Users may extract the information and reformat
|
||||
// if they desire.
|
||||
type Error struct {
|
||||
Line int
|
||||
Msg string
|
||||
}
|
||||
|
||||
func (e *Error) String() string { return fmt.Sprintf("line %d: %s", e.Line, e.Msg) }
|
||||
|
||||
// checkError is a deferred function to turn a panic with type *Error into a plain error return.
|
||||
// Other panics are unexpected and so are re-enabled.
|
||||
func checkError(error *os.Error) {
|
||||
if v := recover(); v != nil {
|
||||
if e, ok := v.(*Error); ok {
|
||||
*error = e
|
||||
} else {
|
||||
// runtime errors should crash
|
||||
panic(v)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Most of the literals are aces.
|
||||
var lbrace = []byte{'{'}
|
||||
var rbrace = []byte{'}'}
|
||||
var space = []byte{' '}
|
||||
var tab = []byte{'\t'}
|
||||
|
||||
// The various types of "tokens", which are plain text or (usually) brace-delimited descriptors
|
||||
const (
|
||||
tokAlternates = iota
|
||||
tokComment
|
||||
tokEnd
|
||||
tokLiteral
|
||||
tokOr
|
||||
tokRepeated
|
||||
tokSection
|
||||
tokText
|
||||
tokVariable
|
||||
)
|
||||
|
||||
// FormatterMap is the type describing the mapping from formatter
|
||||
// names to the functions that implement them.
|
||||
type FormatterMap map[string]func(io.Writer, string, ...interface{})
|
||||
|
||||
// Built-in formatters.
|
||||
var builtins = FormatterMap{
|
||||
"html": HTMLFormatter,
|
||||
"str": StringFormatter,
|
||||
"": StringFormatter,
|
||||
}
|
||||
|
||||
// The parsed state of a template is a vector of xxxElement structs.
|
||||
// Sections have line numbers so errors can be reported better during execution.
|
||||
|
||||
// Plain text.
|
||||
type textElement struct {
|
||||
text []byte
|
||||
}
|
||||
|
||||
// A literal such as .meta-left or .meta-right
|
||||
type literalElement struct {
|
||||
text []byte
|
||||
}
|
||||
|
||||
// A variable invocation to be evaluated
|
||||
type variableElement struct {
|
||||
linenum int
|
||||
args []interface{} // The fields and literals in the invocation.
|
||||
fmts []string // Names of formatters to apply. len(fmts) > 0
|
||||
}
|
||||
|
||||
// A variableElement arg to be evaluated as a field name
|
||||
type fieldName string
|
||||
|
||||
// A .section block, possibly with a .or
|
||||
type sectionElement struct {
|
||||
linenum int // of .section itself
|
||||
field string // cursor field for this block
|
||||
start int // first element
|
||||
or int // first element of .or block
|
||||
end int // one beyond last element
|
||||
}
|
||||
|
||||
// A .repeated block, possibly with a .or and a .alternates
|
||||
type repeatedElement struct {
|
||||
sectionElement // It has the same structure...
|
||||
altstart int // ... except for alternates
|
||||
altend int
|
||||
}
|
||||
|
||||
// Template is the type that represents a template definition.
|
||||
// It is unchanged after parsing.
|
||||
type Template struct {
|
||||
fmap FormatterMap // formatters for variables
|
||||
// Used during parsing:
|
||||
ldelim, rdelim []byte // delimiters; default {}
|
||||
buf []byte // input text to process
|
||||
p int // position in buf
|
||||
linenum int // position in input
|
||||
// Parsed results:
|
||||
elems []interface{}
|
||||
}
|
||||
|
||||
// New creates a new template with the specified formatter map (which
|
||||
// may be nil) to define auxiliary functions for formatting variables.
|
||||
func New(fmap FormatterMap) *Template {
|
||||
t := new(Template)
|
||||
t.fmap = fmap
|
||||
t.ldelim = lbrace
|
||||
t.rdelim = rbrace
|
||||
t.elems = make([]interface{}, 0, 16)
|
||||
return t
|
||||
}
|
||||
|
||||
// Report error and stop executing. The line number must be provided explicitly.
|
||||
func (t *Template) execError(st *state, line int, err string, args ...interface{}) {
|
||||
panic(&Error{line, fmt.Sprintf(err, args...)})
|
||||
}
|
||||
|
||||
// Report error, panic to terminate parsing.
|
||||
// The line number comes from the template state.
|
||||
func (t *Template) parseError(err string, args ...interface{}) {
|
||||
panic(&Error{t.linenum, fmt.Sprintf(err, args...)})
|
||||
}
|
||||
|
||||
// Is this an exported - upper case - name?
|
||||
func isExported(name string) bool {
|
||||
rune, _ := utf8.DecodeRuneInString(name)
|
||||
return unicode.IsUpper(rune)
|
||||
}
|
||||
|
||||
// -- Lexical analysis
|
||||
|
||||
// Is c a space character?
|
||||
func isSpace(c uint8) bool { return c == ' ' || c == '\t' || c == '\r' || c == '\n' }
|
||||
|
||||
// Safely, does s[n:n+len(t)] == t?
|
||||
func equal(s []byte, n int, t []byte) bool {
|
||||
b := s[n:]
|
||||
if len(t) > len(b) { // not enough space left for a match.
|
||||
return false
|
||||
}
|
||||
for i, c := range t {
|
||||
if c != b[i] {
|
||||
return false
|
||||
}
|
||||
}
|
||||
return true
|
||||
}
|
||||
|
||||
// isQuote returns true if c is a string- or character-delimiting quote character.
|
||||
func isQuote(c byte) bool {
|
||||
return c == '"' || c == '`' || c == '\''
|
||||
}
|
||||
|
||||
// endQuote returns the end quote index for the quoted string that
|
||||
// starts at n, or -1 if no matching end quote is found before the end
|
||||
// of the line.
|
||||
func endQuote(s []byte, n int) int {
|
||||
quote := s[n]
|
||||
for n++; n < len(s); n++ {
|
||||
switch s[n] {
|
||||
case '\\':
|
||||
if quote == '"' || quote == '\'' {
|
||||
n++
|
||||
}
|
||||
case '\n':
|
||||
return -1
|
||||
case quote:
|
||||
return n
|
||||
}
|
||||
}
|
||||
return -1
|
||||
}
|
||||
|
||||
// nextItem returns the next item from the input buffer. If the returned
|
||||
// item is empty, we are at EOF. The item will be either a
|
||||
// delimited string or a non-empty string between delimited
|
||||
// strings. Tokens stop at (but include, if plain text) a newline.
|
||||
// Action tokens on a line by themselves drop any space on
|
||||
// either side, up to and including the newline.
|
||||
func (t *Template) nextItem() []byte {
|
||||
startOfLine := t.p == 0 || t.buf[t.p-1] == '\n'
|
||||
start := t.p
|
||||
var i int
|
||||
newline := func() {
|
||||
t.linenum++
|
||||
i++
|
||||
}
|
||||
// Leading space up to but not including newline
|
||||
for i = start; i < len(t.buf); i++ {
|
||||
if t.buf[i] == '\n' || !isSpace(t.buf[i]) {
|
||||
break
|
||||
}
|
||||
}
|
||||
leadingSpace := i > start
|
||||
// What's left is nothing, newline, delimited string, or plain text
|
||||
switch {
|
||||
case i == len(t.buf):
|
||||
// EOF; nothing to do
|
||||
case t.buf[i] == '\n':
|
||||
newline()
|
||||
case equal(t.buf, i, t.ldelim):
|
||||
left := i // Start of left delimiter.
|
||||
right := -1 // Will be (immediately after) right delimiter.
|
||||
haveText := false // Delimiters contain text.
|
||||
i += len(t.ldelim)
|
||||
// Find the end of the action.
|
||||
for ; i < len(t.buf); i++ {
|
||||
if t.buf[i] == '\n' {
|
||||
break
|
||||
}
|
||||
if isQuote(t.buf[i]) {
|
||||
i = endQuote(t.buf, i)
|
||||
if i == -1 {
|
||||
t.parseError("unmatched quote")
|
||||
return nil
|
||||
}
|
||||
continue
|
||||
}
|
||||
if equal(t.buf, i, t.rdelim) {
|
||||
i += len(t.rdelim)
|
||||
right = i
|
||||
break
|
||||
}
|
||||
haveText = true
|
||||
}
|
||||
if right < 0 {
|
||||
t.parseError("unmatched opening delimiter")
|
||||
return nil
|
||||
}
|
||||
// Is this a special action (starts with '.' or '#') and the only thing on the line?
|
||||
if startOfLine && haveText {
|
||||
firstChar := t.buf[left+len(t.ldelim)]
|
||||
if firstChar == '.' || firstChar == '#' {
|
||||
// It's special and the first thing on the line. Is it the last?
|
||||
for j := right; j < len(t.buf) && isSpace(t.buf[j]); j++ {
|
||||
if t.buf[j] == '\n' {
|
||||
// Yes it is. Drop the surrounding space and return the {.foo}
|
||||
t.linenum++
|
||||
t.p = j + 1
|
||||
return t.buf[left:right]
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
// No it's not. If there's leading space, return that.
|
||||
if leadingSpace {
|
||||
// not trimming space: return leading space if there is some.
|
||||
t.p = left
|
||||
return t.buf[start:left]
|
||||
}
|
||||
// Return the word, leave the trailing space.
|
||||
start = left
|
||||
break
|
||||
default:
|
||||
for ; i < len(t.buf); i++ {
|
||||
if t.buf[i] == '\n' {
|
||||
newline()
|
||||
break
|
||||
}
|
||||
if equal(t.buf, i, t.ldelim) {
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
item := t.buf[start:i]
|
||||
t.p = i
|
||||
return item
|
||||
}
|
||||
|
||||
// Turn a byte array into a space-split array of strings,
|
||||
// taking into account quoted strings.
|
||||
func words(buf []byte) []string {
|
||||
s := make([]string, 0, 5)
|
||||
for i := 0; i < len(buf); {
|
||||
// One word per loop
|
||||
for i < len(buf) && isSpace(buf[i]) {
|
||||
i++
|
||||
}
|
||||
if i == len(buf) {
|
||||
break
|
||||
}
|
||||
// Got a word
|
||||
start := i
|
||||
if isQuote(buf[i]) {
|
||||
i = endQuote(buf, i)
|
||||
if i < 0 {
|
||||
i = len(buf)
|
||||
} else {
|
||||
i++
|
||||
}
|
||||
}
|
||||
// Even with quotes, break on space only. This handles input
|
||||
// such as {""|} and catches quoting mistakes.
|
||||
for i < len(buf) && !isSpace(buf[i]) {
|
||||
i++
|
||||
}
|
||||
s = append(s, string(buf[start:i]))
|
||||
}
|
||||
return s
|
||||
}
|
||||
|
||||
// Analyze an item and return its token type and, if it's an action item, an array of
|
||||
// its constituent words.
|
||||
func (t *Template) analyze(item []byte) (tok int, w []string) {
|
||||
// item is known to be non-empty
|
||||
if !equal(item, 0, t.ldelim) { // doesn't start with left delimiter
|
||||
tok = tokText
|
||||
return
|
||||
}
|
||||
if !equal(item, len(item)-len(t.rdelim), t.rdelim) { // doesn't end with right delimiter
|
||||
t.parseError("internal error: unmatched opening delimiter") // lexing should prevent this
|
||||
return
|
||||
}
|
||||
if len(item) <= len(t.ldelim)+len(t.rdelim) { // no contents
|
||||
t.parseError("empty directive")
|
||||
return
|
||||
}
|
||||
// Comment
|
||||
if item[len(t.ldelim)] == '#' {
|
||||
tok = tokComment
|
||||
return
|
||||
}
|
||||
// Split into words
|
||||
w = words(item[len(t.ldelim) : len(item)-len(t.rdelim)]) // drop final delimiter
|
||||
if len(w) == 0 {
|
||||
t.parseError("empty directive")
|
||||
return
|
||||
}
|
||||
first := w[0]
|
||||
if first[0] != '.' {
|
||||
tok = tokVariable
|
||||
return
|
||||
}
|
||||
if len(first) > 1 && first[1] >= '0' && first[1] <= '9' {
|
||||
// Must be a float.
|
||||
tok = tokVariable
|
||||
return
|
||||
}
|
||||
switch first {
|
||||
case ".meta-left", ".meta-right", ".space", ".tab":
|
||||
tok = tokLiteral
|
||||
return
|
||||
case ".or":
|
||||
tok = tokOr
|
||||
return
|
||||
case ".end":
|
||||
tok = tokEnd
|
||||
return
|
||||
case ".section":
|
||||
if len(w) != 2 {
|
||||
t.parseError("incorrect fields for .section: %s", item)
|
||||
return
|
||||
}
|
||||
tok = tokSection
|
||||
return
|
||||
case ".repeated":
|
||||
if len(w) != 3 || w[1] != "section" {
|
||||
t.parseError("incorrect fields for .repeated: %s", item)
|
||||
return
|
||||
}
|
||||
tok = tokRepeated
|
||||
return
|
||||
case ".alternates":
|
||||
if len(w) != 2 || w[1] != "with" {
|
||||
t.parseError("incorrect fields for .alternates: %s", item)
|
||||
return
|
||||
}
|
||||
tok = tokAlternates
|
||||
return
|
||||
}
|
||||
t.parseError("bad directive: %s", item)
|
||||
return
|
||||
}
|
||||
|
||||
// formatter returns the Formatter with the given name in the Template, or nil if none exists.
|
||||
func (t *Template) formatter(name string) func(io.Writer, string, ...interface{}) {
|
||||
if t.fmap != nil {
|
||||
if fn := t.fmap[name]; fn != nil {
|
||||
return fn
|
||||
}
|
||||
}
|
||||
return builtins[name]
|
||||
}
|
||||
|
||||
// -- Parsing
|
||||
|
||||
// newVariable allocates a new variable-evaluation element.
|
||||
func (t *Template) newVariable(words []string) *variableElement {
|
||||
formatters := extractFormatters(words)
|
||||
args := make([]interface{}, len(words))
|
||||
|
||||
// Build argument list, processing any literals
|
||||
for i, word := range words {
|
||||
var lerr os.Error
|
||||
switch word[0] {
|
||||
case '"', '`', '\'':
|
||||
v, err := strconv.Unquote(word)
|
||||
if err == nil && word[0] == '\'' {
|
||||
args[i] = []int(v)[0]
|
||||
} else {
|
||||
args[i], lerr = v, err
|
||||
}
|
||||
|
||||
case '.', '+', '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
|
||||
v, err := strconv.Btoi64(word, 0)
|
||||
if err == nil {
|
||||
args[i] = v
|
||||
} else {
|
||||
v, err := strconv.Atof64(word)
|
||||
args[i], lerr = v, err
|
||||
}
|
||||
|
||||
default:
|
||||
args[i] = fieldName(word)
|
||||
}
|
||||
if lerr != nil {
|
||||
t.parseError("invalid literal: %q: %s", word, lerr)
|
||||
}
|
||||
}
|
||||
|
||||
// We could remember the function address here and avoid the lookup later,
|
||||
// but it's more dynamic to let the user change the map contents underfoot.
|
||||
// We do require the name to be present, though.
|
||||
|
||||
// Is it in user-supplied map?
|
||||
for _, f := range formatters {
|
||||
if t.formatter(f) == nil {
|
||||
t.parseError("unknown formatter: %q", f)
|
||||
}
|
||||
}
|
||||
|
||||
return &variableElement{t.linenum, args, formatters}
|
||||
}
|
||||
|
||||
// extractFormatters extracts a list of formatters from words.
|
||||
// After the final space-separated argument in a variable, formatters may be
|
||||
// specified separated by pipe symbols. For example: {a b c|d|e}
|
||||
// The words parameter still has the formatters joined by '|' in the last word.
|
||||
// extractFormatters splits formatters, replaces the last word with the content
|
||||
// found before the first '|' within it, and returns the formatters obtained.
|
||||
// If no formatters are found in words, the default formatter is returned.
|
||||
func extractFormatters(words []string) (formatters []string) {
|
||||
// "" is the default formatter.
|
||||
formatters = []string{""}
|
||||
if len(words) == 0 {
|
||||
return
|
||||
}
|
||||
var bar int
|
||||
lastWord := words[len(words)-1]
|
||||
if isQuote(lastWord[0]) {
|
||||
end := endQuote([]byte(lastWord), 0)
|
||||
if end < 0 || end+1 == len(lastWord) || lastWord[end+1] != '|' {
|
||||
return
|
||||
}
|
||||
bar = end + 1
|
||||
} else {
|
||||
bar = strings.IndexRune(lastWord, '|')
|
||||
if bar < 0 {
|
||||
return
|
||||
}
|
||||
}
|
||||
words[len(words)-1] = lastWord[0:bar]
|
||||
formatters = strings.Split(lastWord[bar+1:], "|")
|
||||
return
|
||||
}
|
||||
|
||||
// Grab the next item. If it's simple, just append it to the template.
|
||||
// Otherwise return its details.
|
||||
func (t *Template) parseSimple(item []byte) (done bool, tok int, w []string) {
|
||||
tok, w = t.analyze(item)
|
||||
done = true // assume for simplicity
|
||||
switch tok {
|
||||
case tokComment:
|
||||
return
|
||||
case tokText:
|
||||
t.elems = append(t.elems, &textElement{item})
|
||||
return
|
||||
case tokLiteral:
|
||||
switch w[0] {
|
||||
case ".meta-left":
|
||||
t.elems = append(t.elems, &literalElement{t.ldelim})
|
||||
case ".meta-right":
|
||||
t.elems = append(t.elems, &literalElement{t.rdelim})
|
||||
case ".space":
|
||||
t.elems = append(t.elems, &literalElement{space})
|
||||
case ".tab":
|
||||
t.elems = append(t.elems, &literalElement{tab})
|
||||
default:
|
||||
t.parseError("internal error: unknown literal: %s", w[0])
|
||||
}
|
||||
return
|
||||
case tokVariable:
|
||||
t.elems = append(t.elems, t.newVariable(w))
|
||||
return
|
||||
}
|
||||
return false, tok, w
|
||||
}
|
||||
|
||||
// parseRepeated and parseSection are mutually recursive
|
||||
|
||||
func (t *Template) parseRepeated(words []string) *repeatedElement {
|
||||
r := new(repeatedElement)
|
||||
t.elems = append(t.elems, r)
|
||||
r.linenum = t.linenum
|
||||
r.field = words[2]
|
||||
// Scan section, collecting true and false (.or) blocks.
|
||||
r.start = len(t.elems)
|
||||
r.or = -1
|
||||
r.altstart = -1
|
||||
r.altend = -1
|
||||
Loop:
|
||||
for {
|
||||
item := t.nextItem()
|
||||
if len(item) == 0 {
|
||||
t.parseError("missing .end for .repeated section")
|
||||
break
|
||||
}
|
||||
done, tok, w := t.parseSimple(item)
|
||||
if done {
|
||||
continue
|
||||
}
|
||||
switch tok {
|
||||
case tokEnd:
|
||||
break Loop
|
||||
case tokOr:
|
||||
if r.or >= 0 {
|
||||
t.parseError("extra .or in .repeated section")
|
||||
break Loop
|
||||
}
|
||||
r.altend = len(t.elems)
|
||||
r.or = len(t.elems)
|
||||
case tokSection:
|
||||
t.parseSection(w)
|
||||
case tokRepeated:
|
||||
t.parseRepeated(w)
|
||||
case tokAlternates:
|
||||
if r.altstart >= 0 {
|
||||
t.parseError("extra .alternates in .repeated section")
|
||||
break Loop
|
||||
}
|
||||
if r.or >= 0 {
|
||||
t.parseError(".alternates inside .or block in .repeated section")
|
||||
break Loop
|
||||
}
|
||||
r.altstart = len(t.elems)
|
||||
default:
|
||||
t.parseError("internal error: unknown repeated section item: %s", item)
|
||||
break Loop
|
||||
}
|
||||
}
|
||||
if r.altend < 0 {
|
||||
r.altend = len(t.elems)
|
||||
}
|
||||
r.end = len(t.elems)
|
||||
return r
|
||||
}
|
||||
|
||||
func (t *Template) parseSection(words []string) *sectionElement {
|
||||
s := new(sectionElement)
|
||||
t.elems = append(t.elems, s)
|
||||
s.linenum = t.linenum
|
||||
s.field = words[1]
|
||||
// Scan section, collecting true and false (.or) blocks.
|
||||
s.start = len(t.elems)
|
||||
s.or = -1
|
||||
Loop:
|
||||
for {
|
||||
item := t.nextItem()
|
||||
if len(item) == 0 {
|
||||
t.parseError("missing .end for .section")
|
||||
break
|
||||
}
|
||||
done, tok, w := t.parseSimple(item)
|
||||
if done {
|
||||
continue
|
||||
}
|
||||
switch tok {
|
||||
case tokEnd:
|
||||
break Loop
|
||||
case tokOr:
|
||||
if s.or >= 0 {
|
||||
t.parseError("extra .or in .section")
|
||||
break Loop
|
||||
}
|
||||
s.or = len(t.elems)
|
||||
case tokSection:
|
||||
t.parseSection(w)
|
||||
case tokRepeated:
|
||||
t.parseRepeated(w)
|
||||
case tokAlternates:
|
||||
t.parseError(".alternates not in .repeated")
|
||||
default:
|
||||
t.parseError("internal error: unknown section item: %s", item)
|
||||
}
|
||||
}
|
||||
s.end = len(t.elems)
|
||||
return s
|
||||
}
|
||||
|
||||
func (t *Template) parse() {
|
||||
for {
|
||||
item := t.nextItem()
|
||||
if len(item) == 0 {
|
||||
break
|
||||
}
|
||||
done, tok, w := t.parseSimple(item)
|
||||
if done {
|
||||
continue
|
||||
}
|
||||
switch tok {
|
||||
case tokOr, tokEnd, tokAlternates:
|
||||
t.parseError("unexpected %s", w[0])
|
||||
case tokSection:
|
||||
t.parseSection(w)
|
||||
case tokRepeated:
|
||||
t.parseRepeated(w)
|
||||
default:
|
||||
t.parseError("internal error: bad directive in parse: %s", item)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// -- Execution
|
||||
|
||||
// -- Public interface
|
||||
|
||||
// Parse initializes a Template by parsing its definition. The string
|
||||
// s contains the template text. If any errors occur, Parse returns
|
||||
// the error.
|
||||
func (t *Template) Parse(s string) (err os.Error) {
|
||||
if t.elems == nil {
|
||||
return &Error{1, "template not allocated with New"}
|
||||
}
|
||||
if !validDelim(t.ldelim) || !validDelim(t.rdelim) {
|
||||
return &Error{1, fmt.Sprintf("bad delimiter strings %q %q", t.ldelim, t.rdelim)}
|
||||
}
|
||||
defer checkError(&err)
|
||||
t.buf = []byte(s)
|
||||
t.p = 0
|
||||
t.linenum = 1
|
||||
t.parse()
|
||||
return nil
|
||||
}
|
||||
|
||||
// ParseFile is like Parse but reads the template definition from the
|
||||
// named file.
|
||||
func (t *Template) ParseFile(filename string) (err os.Error) {
|
||||
b, err := ioutil.ReadFile(filename)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return t.Parse(string(b))
|
||||
}
|
||||
|
||||
// Execute applies a parsed template to the specified data object,
|
||||
// generating output to wr.
|
||||
func (t *Template) Execute(wr io.Writer, data interface{}) (err os.Error) {
|
||||
// Extract the driver data.
|
||||
val := reflect.ValueOf(data)
|
||||
defer checkError(&err)
|
||||
t.p = 0
|
||||
t.execute(0, len(t.elems), &state{parent: nil, data: val, wr: wr})
|
||||
return nil
|
||||
}
|
||||
|
||||
// SetDelims sets the left and right delimiters for operations in the
|
||||
// template. They are validated during parsing. They could be
|
||||
// validated here but it's better to keep the routine simple. The
|
||||
// delimiters are very rarely invalid and Parse has the necessary
|
||||
// error-handling interface already.
|
||||
func (t *Template) SetDelims(left, right string) {
|
||||
t.ldelim = []byte(left)
|
||||
t.rdelim = []byte(right)
|
||||
}
|
||||
|
||||
// Parse creates a Template with default parameters (such as {} for
|
||||
// metacharacters). The string s contains the template text while
|
||||
// the formatter map fmap, which may be nil, defines auxiliary functions
|
||||
// for formatting variables. The template is returned. If any errors
|
||||
// occur, err will be non-nil.
|
||||
func Parse(s string, fmap FormatterMap) (t *Template, err os.Error) {
|
||||
t = New(fmap)
|
||||
err = t.Parse(s)
|
||||
if err != nil {
|
||||
t = nil
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// ParseFile is a wrapper function that creates a Template with default
|
||||
// parameters (such as {} for metacharacters). The filename identifies
|
||||
// a file containing the template text, while the formatter map fmap, which
|
||||
// may be nil, defines auxiliary functions for formatting variables.
|
||||
// The template is returned. If any errors occur, err will be non-nil.
|
||||
func ParseFile(filename string, fmap FormatterMap) (t *Template, err os.Error) {
|
||||
b, err := ioutil.ReadFile(filename)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return Parse(string(b), fmap)
|
||||
}
|
||||
|
||||
// MustParse is like Parse but panics if the template cannot be parsed.
|
||||
func MustParse(s string, fmap FormatterMap) *Template {
|
||||
t, err := Parse(s, fmap)
|
||||
if err != nil {
|
||||
panic("template.MustParse error: " + err.String())
|
||||
}
|
||||
return t
|
||||
}
|
||||
|
||||
// MustParseFile is like ParseFile but panics if the file cannot be read
|
||||
// or the template cannot be parsed.
|
||||
func MustParseFile(filename string, fmap FormatterMap) *Template {
|
||||
b, err := ioutil.ReadFile(filename)
|
||||
if err != nil {
|
||||
panic("template.MustParseFile error: " + err.String())
|
||||
}
|
||||
return MustParse(string(b), fmap)
|
||||
}
|
||||
@ -1,804 +0,0 @@
|
||||
// Copyright 2009 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 template
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"container/vector"
|
||||
"fmt"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"json"
|
||||
"os"
|
||||
"strings"
|
||||
"testing"
|
||||
)
|
||||
|
||||
type Test struct {
|
||||
in, out, err string
|
||||
}
|
||||
|
||||
type T struct {
|
||||
Item string
|
||||
Value string
|
||||
}
|
||||
|
||||
type U struct {
|
||||
Mp map[string]int
|
||||
}
|
||||
|
||||
type S struct {
|
||||
Header string
|
||||
HeaderPtr *string
|
||||
Integer int
|
||||
IntegerPtr *int
|
||||
NilPtr *int
|
||||
InnerT T
|
||||
InnerPointerT *T
|
||||
Data []T
|
||||
Pdata []*T
|
||||
Empty []*T
|
||||
Emptystring string
|
||||
Null []*T
|
||||
Vec *vector.Vector
|
||||
True bool
|
||||
False bool
|
||||
Mp map[string]string
|
||||
JSON interface{}
|
||||
Innermap U
|
||||
Stringmap map[string]string
|
||||
Ptrmap map[string]*string
|
||||
Iface interface{}
|
||||
Ifaceptr interface{}
|
||||
}
|
||||
|
||||
func (s *S) PointerMethod() string { return "ptrmethod!" }
|
||||
|
||||
func (s S) ValueMethod() string { return "valmethod!" }
|
||||
|
||||
var t1 = T{"ItemNumber1", "ValueNumber1"}
|
||||
var t2 = T{"ItemNumber2", "ValueNumber2"}
|
||||
|
||||
func uppercase(v interface{}) string {
|
||||
s := v.(string)
|
||||
t := ""
|
||||
for i := 0; i < len(s); i++ {
|
||||
c := s[i]
|
||||
if 'a' <= c && c <= 'z' {
|
||||
c = c + 'A' - 'a'
|
||||
}
|
||||
t += string(c)
|
||||
}
|
||||
return t
|
||||
}
|
||||
|
||||
func plus1(v interface{}) string {
|
||||
i := v.(int)
|
||||
return fmt.Sprint(i + 1)
|
||||
}
|
||||
|
||||
func writer(f func(interface{}) string) func(io.Writer, string, ...interface{}) {
|
||||
return func(w io.Writer, format string, v ...interface{}) {
|
||||
if len(v) != 1 {
|
||||
panic("test writer expected one arg")
|
||||
}
|
||||
io.WriteString(w, f(v[0]))
|
||||
}
|
||||
}
|
||||
|
||||
func multiword(w io.Writer, format string, value ...interface{}) {
|
||||
for _, v := range value {
|
||||
fmt.Fprintf(w, "<%v>", v)
|
||||
}
|
||||
}
|
||||
|
||||
func printf(w io.Writer, format string, v ...interface{}) {
|
||||
io.WriteString(w, fmt.Sprintf(v[0].(string), v[1:]...))
|
||||
}
|
||||
|
||||
var formatters = FormatterMap{
|
||||
"uppercase": writer(uppercase),
|
||||
"+1": writer(plus1),
|
||||
"multiword": multiword,
|
||||
"printf": printf,
|
||||
}
|
||||
|
||||
var tests = []*Test{
|
||||
// Simple
|
||||
&Test{"", "", ""},
|
||||
&Test{"abc", "abc", ""},
|
||||
&Test{"abc\ndef\n", "abc\ndef\n", ""},
|
||||
&Test{" {.meta-left} \n", "{", ""},
|
||||
&Test{" {.meta-right} \n", "}", ""},
|
||||
&Test{" {.space} \n", " ", ""},
|
||||
&Test{" {.tab} \n", "\t", ""},
|
||||
&Test{" {#comment} \n", "", ""},
|
||||
&Test{"\tSome Text\t\n", "\tSome Text\t\n", ""},
|
||||
&Test{" {.meta-right} {.meta-right} {.meta-right} \n", " } } } \n", ""},
|
||||
|
||||
// Variables at top level
|
||||
&Test{
|
||||
in: "{Header}={Integer}\n",
|
||||
|
||||
out: "Header=77\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "Pointers: {*HeaderPtr}={*IntegerPtr}\n",
|
||||
|
||||
out: "Pointers: Header=77\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "Stars but not pointers: {*Header}={*Integer}\n",
|
||||
|
||||
out: "Stars but not pointers: Header=77\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "nil pointer: {*NilPtr}={*Integer}\n",
|
||||
|
||||
out: "nil pointer: <nil>=77\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: `{"Strings" ":"} {""} {"|"} {"\t\u0123 \x23\\"} {"\"}{\\"}`,
|
||||
|
||||
out: "Strings: | \t\u0123 \x23\\ \"}{\\",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "{`Raw strings` `:`} {``} {`|`} {`\\t\\u0123 \\x23\\`} {`}{\\`}",
|
||||
|
||||
out: "Raw strings: | \\t\\u0123 \\x23\\ }{\\",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "Characters: {'a'} {'\\u0123'} {' '} {'{'} {'|'} {'}'}",
|
||||
|
||||
out: "Characters: 97 291 32 123 124 125",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "Integers: {1} {-2} {+42} {0777} {0x0a}",
|
||||
|
||||
out: "Integers: 1 -2 42 511 10",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "Floats: {.5} {-.5} {1.1} {-2.2} {+42.1} {1e10} {1.2e-3} {1.2e3} {-1.2e3}",
|
||||
|
||||
out: "Floats: 0.5 -0.5 1.1 -2.2 42.1 1e+10 0.0012 1200 -1200",
|
||||
},
|
||||
|
||||
// Method at top level
|
||||
&Test{
|
||||
in: "ptrmethod={PointerMethod}\n",
|
||||
|
||||
out: "ptrmethod=ptrmethod!\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "valmethod={ValueMethod}\n",
|
||||
|
||||
out: "valmethod=valmethod!\n",
|
||||
},
|
||||
|
||||
// Section
|
||||
&Test{
|
||||
in: "{.section Data }\n" +
|
||||
"some text for the section\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "some text for the section\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Data }\n" +
|
||||
"{Header}={Integer}\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "Header=77\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Pdata }\n" +
|
||||
"{Header}={Integer}\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "Header=77\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Pdata }\n" +
|
||||
"data present\n" +
|
||||
"{.or}\n" +
|
||||
"data not present\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "data present\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Empty }\n" +
|
||||
"data present\n" +
|
||||
"{.or}\n" +
|
||||
"data not present\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "data not present\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Null }\n" +
|
||||
"data present\n" +
|
||||
"{.or}\n" +
|
||||
"data not present\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "data not present\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Pdata }\n" +
|
||||
"{Header}={Integer}\n" +
|
||||
"{.section @ }\n" +
|
||||
"{Header}={Integer}\n" +
|
||||
"{.end}\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "Header=77\n" +
|
||||
"Header=77\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "{.section Data}{.end} {Header}\n",
|
||||
|
||||
out: " Header\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "{.section Integer}{@}{.end}",
|
||||
|
||||
out: "77",
|
||||
},
|
||||
|
||||
// Repeated
|
||||
&Test{
|
||||
in: "{.section Pdata }\n" +
|
||||
"{.repeated section @ }\n" +
|
||||
"{Item}={Value}\n" +
|
||||
"{.end}\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "ItemNumber1=ValueNumber1\n" +
|
||||
"ItemNumber2=ValueNumber2\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Pdata }\n" +
|
||||
"{.repeated section @ }\n" +
|
||||
"{Item}={Value}\n" +
|
||||
"{.or}\n" +
|
||||
"this should not appear\n" +
|
||||
"{.end}\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "ItemNumber1=ValueNumber1\n" +
|
||||
"ItemNumber2=ValueNumber2\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section @ }\n" +
|
||||
"{.repeated section Empty }\n" +
|
||||
"{Item}={Value}\n" +
|
||||
"{.or}\n" +
|
||||
"this should appear: empty field\n" +
|
||||
"{.end}\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "this should appear: empty field\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.repeated section Pdata }\n" +
|
||||
"{Item}\n" +
|
||||
"{.alternates with}\n" +
|
||||
"is\nover\nmultiple\nlines\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "ItemNumber1\n" +
|
||||
"is\nover\nmultiple\nlines\n" +
|
||||
"ItemNumber2\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.repeated section Pdata }\n" +
|
||||
"{Item}\n" +
|
||||
"{.alternates with}\n" +
|
||||
"is\nover\nmultiple\nlines\n" +
|
||||
" {.end}\n",
|
||||
|
||||
out: "ItemNumber1\n" +
|
||||
"is\nover\nmultiple\nlines\n" +
|
||||
"ItemNumber2\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Pdata }\n" +
|
||||
"{.repeated section @ }\n" +
|
||||
"{Item}={Value}\n" +
|
||||
"{.alternates with}DIVIDER\n" +
|
||||
"{.or}\n" +
|
||||
"this should not appear\n" +
|
||||
"{.end}\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "ItemNumber1=ValueNumber1\n" +
|
||||
"DIVIDER\n" +
|
||||
"ItemNumber2=ValueNumber2\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.repeated section Vec }\n" +
|
||||
"{@}\n" +
|
||||
"{.end}\n",
|
||||
|
||||
out: "elt1\n" +
|
||||
"elt2\n",
|
||||
},
|
||||
// Same but with a space before {.end}: was a bug.
|
||||
&Test{
|
||||
in: "{.repeated section Vec }\n" +
|
||||
"{@} {.end}\n",
|
||||
|
||||
out: "elt1 elt2 \n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.repeated section Integer}{.end}",
|
||||
|
||||
err: "line 1: .repeated: cannot repeat Integer (type int)",
|
||||
},
|
||||
|
||||
// Nested names
|
||||
&Test{
|
||||
in: "{.section @ }\n" +
|
||||
"{InnerT.Item}={InnerT.Value}\n" +
|
||||
"{.end}",
|
||||
|
||||
out: "ItemNumber1=ValueNumber1\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section @ }\n" +
|
||||
"{InnerT.Item}={.section InnerT}{.section Value}{@}{.end}{.end}\n" +
|
||||
"{.end}",
|
||||
|
||||
out: "ItemNumber1=ValueNumber1\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "{.section Emptystring}emptystring{.end}\n" +
|
||||
"{.section Header}header{.end}\n",
|
||||
|
||||
out: "\nheader\n",
|
||||
},
|
||||
|
||||
&Test{
|
||||
in: "{.section True}1{.or}2{.end}\n" +
|
||||
"{.section False}3{.or}4{.end}\n",
|
||||
|
||||
out: "1\n4\n",
|
||||
},
|
||||
|
||||
// Maps
|
||||
|
||||
&Test{
|
||||
in: "{Mp.mapkey}\n",
|
||||
|
||||
out: "Ahoy!\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{Innermap.Mp.innerkey}\n",
|
||||
|
||||
out: "55\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Innermap}{.section Mp}{innerkey}{.end}{.end}\n",
|
||||
|
||||
out: "55\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section JSON}{.repeated section maps}{a}{b}{.end}{.end}\n",
|
||||
|
||||
out: "1234\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{Stringmap.stringkey1}\n",
|
||||
|
||||
out: "stringresult\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.repeated section Stringmap}\n" +
|
||||
"{@}\n" +
|
||||
"{.end}",
|
||||
|
||||
out: "stringresult\n" +
|
||||
"stringresult\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.repeated section Stringmap}\n" +
|
||||
"\t{@}\n" +
|
||||
"{.end}",
|
||||
|
||||
out: "\tstringresult\n" +
|
||||
"\tstringresult\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{*Ptrmap.stringkey1}\n",
|
||||
|
||||
out: "pointedToString\n",
|
||||
},
|
||||
&Test{
|
||||
in: "{.repeated section Ptrmap}\n" +
|
||||
"{*@}\n" +
|
||||
"{.end}",
|
||||
|
||||
out: "pointedToString\n" +
|
||||
"pointedToString\n",
|
||||
},
|
||||
|
||||
// Interface values
|
||||
|
||||
&Test{
|
||||
in: "{Iface}",
|
||||
|
||||
out: "[1 2 3]",
|
||||
},
|
||||
&Test{
|
||||
in: "{.repeated section Iface}{@}{.alternates with} {.end}",
|
||||
|
||||
out: "1 2 3",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Iface}{@}{.end}",
|
||||
|
||||
out: "[1 2 3]",
|
||||
},
|
||||
&Test{
|
||||
in: "{.section Ifaceptr}{Item} {Value}{.end}",
|
||||
|
||||
out: "Item Value",
|
||||
},
|
||||
}
|
||||
|
||||
func TestAll(t *testing.T) {
|
||||
// Parse
|
||||
testAll(t, func(test *Test) (*Template, os.Error) { return Parse(test.in, formatters) })
|
||||
// ParseFile
|
||||
testAll(t, func(test *Test) (*Template, os.Error) {
|
||||
err := ioutil.WriteFile("_test/test.tmpl", []byte(test.in), 0600)
|
||||
if err != nil {
|
||||
t.Error("unexpected write error:", err)
|
||||
return nil, err
|
||||
}
|
||||
return ParseFile("_test/test.tmpl", formatters)
|
||||
})
|
||||
// tmpl.ParseFile
|
||||
testAll(t, func(test *Test) (*Template, os.Error) {
|
||||
err := ioutil.WriteFile("_test/test.tmpl", []byte(test.in), 0600)
|
||||
if err != nil {
|
||||
t.Error("unexpected write error:", err)
|
||||
return nil, err
|
||||
}
|
||||
tmpl := New(formatters)
|
||||
return tmpl, tmpl.ParseFile("_test/test.tmpl")
|
||||
})
|
||||
}
|
||||
|
||||
func testAll(t *testing.T, parseFunc func(*Test) (*Template, os.Error)) {
|
||||
s := new(S)
|
||||
// initialized by hand for clarity.
|
||||
s.Header = "Header"
|
||||
s.HeaderPtr = &s.Header
|
||||
s.Integer = 77
|
||||
s.IntegerPtr = &s.Integer
|
||||
s.InnerT = t1
|
||||
s.Data = []T{t1, t2}
|
||||
s.Pdata = []*T{&t1, &t2}
|
||||
s.Empty = []*T{}
|
||||
s.Null = nil
|
||||
s.Vec = new(vector.Vector)
|
||||
s.Vec.Push("elt1")
|
||||
s.Vec.Push("elt2")
|
||||
s.True = true
|
||||
s.False = false
|
||||
s.Mp = make(map[string]string)
|
||||
s.Mp["mapkey"] = "Ahoy!"
|
||||
json.Unmarshal([]byte(`{"maps":[{"a":1,"b":2},{"a":3,"b":4}]}`), &s.JSON)
|
||||
s.Innermap.Mp = make(map[string]int)
|
||||
s.Innermap.Mp["innerkey"] = 55
|
||||
s.Stringmap = make(map[string]string)
|
||||
s.Stringmap["stringkey1"] = "stringresult" // the same value so repeated section is order-independent
|
||||
s.Stringmap["stringkey2"] = "stringresult"
|
||||
s.Ptrmap = make(map[string]*string)
|
||||
x := "pointedToString"
|
||||
s.Ptrmap["stringkey1"] = &x // the same value so repeated section is order-independent
|
||||
s.Ptrmap["stringkey2"] = &x
|
||||
s.Iface = []int{1, 2, 3}
|
||||
s.Ifaceptr = &T{"Item", "Value"}
|
||||
|
||||
var buf bytes.Buffer
|
||||
for _, test := range tests {
|
||||
buf.Reset()
|
||||
tmpl, err := parseFunc(test)
|
||||
if err != nil {
|
||||
t.Error("unexpected parse error: ", err)
|
||||
continue
|
||||
}
|
||||
err = tmpl.Execute(&buf, s)
|
||||
if test.err == "" {
|
||||
if err != nil {
|
||||
t.Error("unexpected execute error:", err)
|
||||
}
|
||||
} else {
|
||||
if err == nil {
|
||||
t.Errorf("expected execute error %q, got nil", test.err)
|
||||
} else if err.String() != test.err {
|
||||
t.Errorf("expected execute error %q, got %q", test.err, err.String())
|
||||
}
|
||||
}
|
||||
if buf.String() != test.out {
|
||||
t.Errorf("for %q: expected %q got %q", test.in, test.out, buf.String())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestMapDriverType(t *testing.T) {
|
||||
mp := map[string]string{"footer": "Ahoy!"}
|
||||
tmpl, err := Parse("template: {footer}", nil)
|
||||
if err != nil {
|
||||
t.Error("unexpected parse error:", err)
|
||||
}
|
||||
var b bytes.Buffer
|
||||
err = tmpl.Execute(&b, mp)
|
||||
if err != nil {
|
||||
t.Error("unexpected execute error:", err)
|
||||
}
|
||||
s := b.String()
|
||||
expect := "template: Ahoy!"
|
||||
if s != expect {
|
||||
t.Errorf("failed passing string as data: expected %q got %q", expect, s)
|
||||
}
|
||||
}
|
||||
|
||||
func TestMapNoEntry(t *testing.T) {
|
||||
mp := make(map[string]int)
|
||||
tmpl, err := Parse("template: {notthere}!", nil)
|
||||
if err != nil {
|
||||
t.Error("unexpected parse error:", err)
|
||||
}
|
||||
var b bytes.Buffer
|
||||
err = tmpl.Execute(&b, mp)
|
||||
if err != nil {
|
||||
t.Error("unexpected execute error:", err)
|
||||
}
|
||||
s := b.String()
|
||||
expect := "template: 0!"
|
||||
if s != expect {
|
||||
t.Errorf("failed passing string as data: expected %q got %q", expect, s)
|
||||
}
|
||||
}
|
||||
|
||||
func TestStringDriverType(t *testing.T) {
|
||||
tmpl, err := Parse("template: {@}", nil)
|
||||
if err != nil {
|
||||
t.Error("unexpected parse error:", err)
|
||||
}
|
||||
var b bytes.Buffer
|
||||
err = tmpl.Execute(&b, "hello")
|
||||
if err != nil {
|
||||
t.Error("unexpected execute error:", err)
|
||||
}
|
||||
s := b.String()
|
||||
expect := "template: hello"
|
||||
if s != expect {
|
||||
t.Errorf("failed passing string as data: expected %q got %q", expect, s)
|
||||
}
|
||||
}
|
||||
|
||||
func TestTwice(t *testing.T) {
|
||||
tmpl, err := Parse("template: {@}", nil)
|
||||
if err != nil {
|
||||
t.Error("unexpected parse error:", err)
|
||||
}
|
||||
var b bytes.Buffer
|
||||
err = tmpl.Execute(&b, "hello")
|
||||
if err != nil {
|
||||
t.Error("unexpected parse error:", err)
|
||||
}
|
||||
s := b.String()
|
||||
expect := "template: hello"
|
||||
if s != expect {
|
||||
t.Errorf("failed passing string as data: expected %q got %q", expect, s)
|
||||
}
|
||||
err = tmpl.Execute(&b, "hello")
|
||||
if err != nil {
|
||||
t.Error("unexpected parse error:", err)
|
||||
}
|
||||
s = b.String()
|
||||
expect += expect
|
||||
if s != expect {
|
||||
t.Errorf("failed passing string as data: expected %q got %q", expect, s)
|
||||
}
|
||||
}
|
||||
|
||||
func TestCustomDelims(t *testing.T) {
|
||||
// try various lengths. zero should catch error.
|
||||
for i := 0; i < 7; i++ {
|
||||
for j := 0; j < 7; j++ {
|
||||
tmpl := New(nil)
|
||||
// first two chars deliberately the same to test equal left and right delims
|
||||
ldelim := "$!#$%^&"[0:i]
|
||||
rdelim := "$*&^%$!"[0:j]
|
||||
tmpl.SetDelims(ldelim, rdelim)
|
||||
// if braces, this would be template: {@}{.meta-left}{.meta-right}
|
||||
text := "template: " +
|
||||
ldelim + "@" + rdelim +
|
||||
ldelim + ".meta-left" + rdelim +
|
||||
ldelim + ".meta-right" + rdelim
|
||||
err := tmpl.Parse(text)
|
||||
if err != nil {
|
||||
if i == 0 || j == 0 { // expected
|
||||
continue
|
||||
}
|
||||
t.Error("unexpected parse error:", err)
|
||||
} else if i == 0 || j == 0 {
|
||||
t.Errorf("expected parse error for empty delimiter: %d %d %q %q", i, j, ldelim, rdelim)
|
||||
continue
|
||||
}
|
||||
var b bytes.Buffer
|
||||
err = tmpl.Execute(&b, "hello")
|
||||
s := b.String()
|
||||
if s != "template: hello"+ldelim+rdelim {
|
||||
t.Errorf("failed delim check(%q %q) %q got %q", ldelim, rdelim, text, s)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Test that a variable evaluates to the field itself and does not further indirection
|
||||
func TestVarIndirection(t *testing.T) {
|
||||
s := new(S)
|
||||
// initialized by hand for clarity.
|
||||
s.InnerPointerT = &t1
|
||||
|
||||
var buf bytes.Buffer
|
||||
input := "{.section @}{InnerPointerT}{.end}"
|
||||
tmpl, err := Parse(input, nil)
|
||||
if err != nil {
|
||||
t.Fatal("unexpected parse error:", err)
|
||||
}
|
||||
err = tmpl.Execute(&buf, s)
|
||||
if err != nil {
|
||||
t.Fatal("unexpected execute error:", err)
|
||||
}
|
||||
expect := fmt.Sprintf("%v", &t1) // output should be hex address of t1
|
||||
if buf.String() != expect {
|
||||
t.Errorf("for %q: expected %q got %q", input, expect, buf.String())
|
||||
}
|
||||
}
|
||||
|
||||
func TestHTMLFormatterWithByte(t *testing.T) {
|
||||
s := "Test string."
|
||||
b := []byte(s)
|
||||
var buf bytes.Buffer
|
||||
HTMLFormatter(&buf, "", b)
|
||||
bs := buf.String()
|
||||
if bs != s {
|
||||
t.Errorf("munged []byte, expected: %s got: %s", s, bs)
|
||||
}
|
||||
}
|
||||
|
||||
type UF struct {
|
||||
I int
|
||||
s string
|
||||
}
|
||||
|
||||
func TestReferenceToUnexported(t *testing.T) {
|
||||
u := &UF{3, "hello"}
|
||||
var buf bytes.Buffer
|
||||
input := "{.section @}{I}{s}{.end}"
|
||||
tmpl, err := Parse(input, nil)
|
||||
if err != nil {
|
||||
t.Fatal("unexpected parse error:", err)
|
||||
}
|
||||
err = tmpl.Execute(&buf, u)
|
||||
if err == nil {
|
||||
t.Fatal("expected execute error, got none")
|
||||
}
|
||||
if strings.Index(err.String(), "not exported") < 0 {
|
||||
t.Fatal("expected unexported error; got", err)
|
||||
}
|
||||
}
|
||||
|
||||
var formatterTests = []Test{
|
||||
{
|
||||
in: "{Header|uppercase}={Integer|+1}\n" +
|
||||
"{Header|html}={Integer|str}\n",
|
||||
|
||||
out: "HEADER=78\n" +
|
||||
"Header=77\n",
|
||||
},
|
||||
|
||||
{
|
||||
in: "{Header|uppercase}={Integer Header|multiword}\n" +
|
||||
"{Header|html}={Header Integer|multiword}\n" +
|
||||
"{Header|html}={Header Integer}\n",
|
||||
|
||||
out: "HEADER=<77><Header>\n" +
|
||||
"Header=<Header><77>\n" +
|
||||
"Header=Header77\n",
|
||||
},
|
||||
{
|
||||
in: "{Raw}\n" +
|
||||
"{Raw|html}\n",
|
||||
|
||||
out: "a <&> b\n" +
|
||||
"a <&> b\n",
|
||||
},
|
||||
{
|
||||
in: "{Bytes}",
|
||||
out: "hello",
|
||||
},
|
||||
{
|
||||
in: "{Raw|uppercase|html|html}",
|
||||
out: "A &lt;&amp;&gt; B",
|
||||
},
|
||||
{
|
||||
in: "{Header Integer|multiword|html}",
|
||||
out: "<Header><77>",
|
||||
},
|
||||
{
|
||||
in: "{Integer|no_formatter|html}",
|
||||
err: `unknown formatter: "no_formatter"`,
|
||||
},
|
||||
{
|
||||
in: "{Integer|||||}", // empty string is a valid formatter
|
||||
out: "77",
|
||||
},
|
||||
{
|
||||
in: `{"%.02f 0x%02X" 1.1 10|printf}`,
|
||||
out: "1.10 0x0A",
|
||||
},
|
||||
{
|
||||
in: `{""|}{""||}{""|printf}`, // Issue #1896.
|
||||
out: "",
|
||||
},
|
||||
}
|
||||
|
||||
func TestFormatters(t *testing.T) {
|
||||
data := map[string]interface{}{
|
||||
"Header": "Header",
|
||||
"Integer": 77,
|
||||
"Raw": "a <&> b",
|
||||
"Bytes": []byte("hello"),
|
||||
}
|
||||
for _, c := range formatterTests {
|
||||
tmpl, err := Parse(c.in, formatters)
|
||||
if err != nil {
|
||||
if c.err == "" {
|
||||
t.Error("unexpected parse error:", err)
|
||||
continue
|
||||
}
|
||||
if strings.Index(err.String(), c.err) < 0 {
|
||||
t.Errorf("unexpected error: expected %q, got %q", c.err, err.String())
|
||||
continue
|
||||
}
|
||||
} else {
|
||||
if c.err != "" {
|
||||
t.Errorf("For %q, expected error, got none.", c.in)
|
||||
continue
|
||||
}
|
||||
buf := bytes.NewBuffer(nil)
|
||||
err = tmpl.Execute(buf, data)
|
||||
if err != nil {
|
||||
t.Error("unexpected Execute error: ", err)
|
||||
continue
|
||||
}
|
||||
actual := buf.String()
|
||||
if actual != c.out {
|
||||
t.Errorf("for %q: expected %q but got %q.", c.in, c.out, actual)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -17,8 +17,8 @@ import (
|
||||
"bufio"
|
||||
"fmt"
|
||||
"io"
|
||||
"old/template"
|
||||
"os"
|
||||
"template"
|
||||
)
|
||||
|
||||
func main() {
|
||||
@ -479,4 +479,3 @@ func next() bool {
|
||||
cp = 0
|
||||
return true
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user