html/template: add Templates and *Escape functions

to bring it in line with text/template's interface.
Fixes #3296.

R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/5843066

src/pkg/html/template/clone_test.go

@@ -114,6 +114,32 @@ func TestClone(t *testing.T) {
 	}
 }
 
+func TestTemplates(t *testing.T) {
+	names := []string{"t0", "a", "lhs", "rhs"}
+	// Some template definitions borrowed from TestClone.
+	const tmpl = `
+		{{define "a"}}{{template "lhs"}}{{.}}{{template "rhs"}}{{end}}
+		{{define "lhs"}} <a href=" {{end}}
+		{{define "rhs"}} "></a> {{end}}`
+	t0 := Must(New("t0").Parse(tmpl))
+	templates := t0.Templates()
+	if len(templates) != len(names) {
+		t.Errorf("expected %d templates; got %d", len(names), len(templates))
+	}
+	for _, name := range names {
+		found := false
+		for _, tmpl := range templates {
+			if name == tmpl.text.Name() {
+				found = true
+				break
+			}
+		}
+		if !found {
+			t.Error("could not find template", name)
+		}
+	}
+}
+
 // This used to crash; http://golang.org/issue/3281
 func TestCloneCrash(t *testing.T) {
 	t1 := New("all")

src/pkg/html/template/escape.go

@@ -8,6 +8,7 @@ import (
 	"bytes"
 	"fmt"
 	"html"
+	"io"
 	"text/template"
 	"text/template/parse"
 )
@@ -751,3 +752,44 @@ func (e *escaper) template(name string) *template.Template {
 	}
 	return t
 }
+
+// Forwarding functions so that clients need only import this package
+// to reach the general escaping functions of text/template.
+
+// HTMLEscape writes to w the escaped HTML equivalent of the plain text data b.
+func HTMLEscape(w io.Writer, b []byte) {
+	template.HTMLEscape(w, b)
+}
+
+// HTMLEscapeString returns the escaped HTML equivalent of the plain text data s.
+func HTMLEscapeString(s string) string {
+	return template.HTMLEscapeString(s)
+}
+
+// HTMLEscaper returns the escaped HTML equivalent of the textual
+// representation of its arguments.
+func HTMLEscaper(args ...interface{}) string {
+	return template.HTMLEscaper(args...)
+}
+
+// JSEscape writes to w the escaped JavaScript equivalent of the plain text data b.
+func JSEscape(w io.Writer, b []byte) {
+	template.JSEscape(w, b)
+}
+
+// JSEscapeString returns the escaped JavaScript equivalent of the plain text data s.
+func JSEscapeString(s string) string {
+	return template.JSEscapeString(s)
+}
+
+// JSEscaper returns the escaped JavaScript equivalent of the textual
+// representation of its arguments.
+func JSEscaper(args ...interface{}) string {
+	return template.JSEscaper(args...)
+}
+
+// URLQueryEscaper returns the escaped value of the textual representation of
+// its arguments in a form suitable for embedding in a URL query.
+func URLQueryEscaper(args ...interface{}) string {
+	return template.URLQueryEscaper(args...)
+}

src/pkg/html/template/template.go

@@ -31,6 +31,20 @@ type nameSpace struct {
 	set map[string]*Template
 }
 
+// Templates returns a slice of the templates associated with t, including t
+// itself.
+func (t *Template) Templates() []*Template {
+	ns := t.nameSpace
+	ns.mu.Lock()
+	defer ns.mu.Unlock()
+	// Return a slice so we don't expose the map.
+	m := make([]*Template, 0, len(ns.set))
+	for _, v := range ns.set {
+		m = append(m, v)
+	}
+	return m
+}
+
 // Execute applies a parsed template to the specified data object,
 // writing the output to wr.
 func (t *Template) Execute(wr io.Writer, data interface{}) (err error) {