1 files changed, 218 insertions, 0 deletions
diff --git a/src/html/template/template_test.go b/src/html/template/template_test.go
new file mode 100644
index 0000000..99a1091
--- /dev/null
+++ b/src/html/template/template_test.go
@@ -0,0 +1,218 @@
+// Copyright 2016 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_test
+
+import (
+	"bytes"
+	"encoding/json"
+	. "html/template"
+	"strings"
+	"testing"
+	"text/template/parse"
+)
+
+func TestTemplateClone(t *testing.T) {
+	// https://golang.org/issue/12996
+	orig := New("name")
+	clone, err := orig.Clone()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(clone.Templates()) != len(orig.Templates()) {
+		t.Fatalf("Invalid length of t.Clone().Templates()")
+	}
+
+	const want = "stuff"
+	parsed := Must(clone.Parse(want))
+	var buf bytes.Buffer
+	err = parsed.Execute(&buf, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got := buf.String(); got != want {
+		t.Fatalf("got %q; want %q", got, want)
+	}
+}
+
+func TestRedefineNonEmptyAfterExecution(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, `foo`)
+	c.mustExecute(c.root, nil, "foo")
+	c.mustNotParse(c.root, `bar`)
+}
+
+func TestRedefineEmptyAfterExecution(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, ``)
+	c.mustExecute(c.root, nil, "")
+	c.mustNotParse(c.root, `foo`)
+	c.mustExecute(c.root, nil, "")
+}
+
+func TestRedefineAfterNonExecution(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, `{{if .}}<{{template "X"}}>{{end}}{{define "X"}}foo{{end}}`)
+	c.mustExecute(c.root, 0, "")
+	c.mustNotParse(c.root, `{{define "X"}}bar{{end}}`)
+	c.mustExecute(c.root, 1, "&lt;foo>")
+}
+
+func TestRedefineAfterNamedExecution(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, `<{{template "X" .}}>{{define "X"}}foo{{end}}`)
+	c.mustExecute(c.root, nil, "&lt;foo>")
+	c.mustNotParse(c.root, `{{define "X"}}bar{{end}}`)
+	c.mustExecute(c.root, nil, "&lt;foo>")
+}
+
+func TestRedefineNestedByNameAfterExecution(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, `{{define "X"}}foo{{end}}`)
+	c.mustExecute(c.lookup("X"), nil, "foo")
+	c.mustNotParse(c.root, `{{define "X"}}bar{{end}}`)
+	c.mustExecute(c.lookup("X"), nil, "foo")
+}
+
+func TestRedefineNestedByTemplateAfterExecution(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, `{{define "X"}}foo{{end}}`)
+	c.mustExecute(c.lookup("X"), nil, "foo")
+	c.mustNotParse(c.lookup("X"), `bar`)
+	c.mustExecute(c.lookup("X"), nil, "foo")
+}
+
+func TestRedefineSafety(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, `<html><a href="{{template "X"}}">{{define "X"}}{{end}}`)
+	c.mustExecute(c.root, nil, `<html><a href="">`)
+	// Note: Every version of Go prior to Go 1.8 accepted the redefinition of "X"
+	// on the next line, but luckily kept it from being used in the outer template.
+	// Now we reject it, which makes clearer that we're not going to use it.
+	c.mustNotParse(c.root, `{{define "X"}}" bar="baz{{end}}`)
+	c.mustExecute(c.root, nil, `<html><a href="">`)
+}
+
+func TestRedefineTopUse(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, `{{template "X"}}{{.}}{{define "X"}}{{end}}`)
+	c.mustExecute(c.root, 42, `42`)
+	c.mustNotParse(c.root, `{{define "X"}}<script>{{end}}`)
+	c.mustExecute(c.root, 42, `42`)
+}
+
+func TestRedefineOtherParsers(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, ``)
+	c.mustExecute(c.root, nil, ``)
+	if _, err := c.root.ParseFiles("no.template"); err == nil || !strings.Contains(err.Error(), "Execute") {
+		t.Errorf("ParseFiles: %v\nwanted error about already having Executed", err)
+	}
+	if _, err := c.root.ParseGlob("*.no.template"); err == nil || !strings.Contains(err.Error(), "Execute") {
+		t.Errorf("ParseGlob: %v\nwanted error about already having Executed", err)
+	}
+	if _, err := c.root.AddParseTree("t1", c.root.Tree); err == nil || !strings.Contains(err.Error(), "Execute") {
+		t.Errorf("AddParseTree: %v\nwanted error about already having Executed", err)
+	}
+}
+
+func TestNumbers(t *testing.T) {
+	c := newTestCase(t)
+	c.mustParse(c.root, `{{print 1_2.3_4}} {{print 0x0_1.e_0p+02}}`)
+	c.mustExecute(c.root, nil, "12.34 7.5")
+}
+
+func TestStringsInScriptsWithJsonContentTypeAreCorrectlyEscaped(t *testing.T) {
+	// See #33671 and #37634 for more context on this.
+	tests := []struct{ name, in string }{
+		{"empty", ""},
+		{"invalid", string(rune(-1))},
+		{"null", "\u0000"},
+		{"unit separator", "\u001F"},
+		{"tab", "\t"},
+		{"gt and lt", "<>"},
+		{"quotes", `'"`},
+		{"ASCII letters", "ASCII letters"},
+		{"Unicode", "ʕ⊙ϖ⊙ʔ"},
+		{"Pizza", "🍕"},
+	}
+	const (
+		prefix = `<script type="application/ld+json">`
+		suffix = `</script>`
+		templ  = prefix + `"{{.}}"` + suffix
+	)
+	tpl := Must(New("JS string is JSON string").Parse(templ))
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			if err := tpl.Execute(&buf, tt.in); err != nil {
+				t.Fatalf("Cannot render template: %v", err)
+			}
+			trimmed := bytes.TrimSuffix(bytes.TrimPrefix(buf.Bytes(), []byte(prefix)), []byte(suffix))
+			var got string
+			if err := json.Unmarshal(trimmed, &got); err != nil {
+				t.Fatalf("Cannot parse JS string %q as JSON: %v", trimmed[1:len(trimmed)-1], err)
+			}
+			if got != tt.in {
+				t.Errorf("Serialization changed the string value: got %q want %q", got, tt.in)
+			}
+		})
+	}
+}
+
+func TestSkipEscapeComments(t *testing.T) {
+	c := newTestCase(t)
+	tr := parse.New("root")
+	tr.Mode = parse.ParseComments
+	newT, err := tr.Parse("{{/* A comment */}}{{ 1 }}{{/* Another comment */}}", "", "", make(map[string]*parse.Tree))
+	if err != nil {
+		t.Fatalf("Cannot parse template text: %v", err)
+	}
+	c.root, err = c.root.AddParseTree("root", newT)
+	if err != nil {
+		t.Fatalf("Cannot add parse tree to template: %v", err)
+	}
+	c.mustExecute(c.root, nil, "1")
+}
+
+type testCase struct {
+	t    *testing.T
+	root *Template
+}
+
+func newTestCase(t *testing.T) *testCase {
+	return &testCase{
+		t:    t,
+		root: New("root"),
+	}
+}
+
+func (c *testCase) lookup(name string) *Template {
+	return c.root.Lookup(name)
+}
+
+func (c *testCase) mustParse(t *Template, text string) {
+	_, err := t.Parse(text)
+	if err != nil {
+		c.t.Fatalf("parse: %v", err)
+	}
+}
+
+func (c *testCase) mustNotParse(t *Template, text string) {
+	_, err := t.Parse(text)
+	if err == nil {
+		c.t.Fatalf("parse: unexpected success")
+	}
+}
+
+func (c *testCase) mustExecute(t *Template, val any, want string) {
+	var buf bytes.Buffer
+	err := t.Execute(&buf, val)
+	if err != nil {
+		c.t.Fatalf("execute: %v", err)
+	}
+	if buf.String() != want {
+		c.t.Fatalf("template output:\n%s\nwant:\n%s", buf.String(), want)
+	}
+}