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html/template: fix nil pointer bug
Fixes #3272. R=golang-dev, rsc CC=golang-dev https://golang.org/cl/5819046
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@ -8,6 +8,7 @@ import (
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"bytes"
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"encoding/json"
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"fmt"
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"os"
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"strings"
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"testing"
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"text/template"
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@ -1637,6 +1638,14 @@ func TestIndirectPrint(t *testing.T) {
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}
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}
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// This is a test for issue 3272.
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func TestEmptyTemplate(t *testing.T) {
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page := Must(New("page").ParseFiles(os.DevNull))
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if err := page.ExecuteTemplate(os.Stdout, "page", "nothing"); err == nil {
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t.Fatal("expected error")
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}
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}
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func BenchmarkEscapedExecute(b *testing.B) {
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tmpl := Must(New("t").Parse(`<a onclick="alert('{{.}}')">{{.}}</a>`))
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var buf bytes.Buffer
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@ -64,7 +64,13 @@ func (t *Template) lookupAndEscapeTemplate(name string) (tmpl *Template, err err
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t.nameSpace.mu.Lock()
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defer t.nameSpace.mu.Unlock()
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tmpl = t.set[name]
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if (tmpl == nil) != (t.text.Lookup(name) == nil) {
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if tmpl == nil {
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return nil, fmt.Errorf("html/template: %q is undefined", name)
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}
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if tmpl.text.Tree == nil || tmpl.text.Root == nil {
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return nil, fmt.Errorf("html/template: %q is an incomplete template", name)
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}
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if t.text.Lookup(name) == nil {
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panic("html/template internal error: template escaping out of sync")
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}
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if tmpl != nil && !tmpl.escaped {
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@ -276,7 +282,7 @@ func (t *Template) ParseFiles(filenames ...string) (*Template, error) {
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func parseFiles(t *Template, filenames ...string) (*Template, error) {
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if len(filenames) == 0 {
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// Not really a problem, but be consistent.
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return nil, fmt.Errorf("template: no files named in call to ParseFiles")
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return nil, fmt.Errorf("html/template: no files named in call to ParseFiles")
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}
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for _, filename := range filenames {
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b, err := ioutil.ReadFile(filename)
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@ -333,7 +339,7 @@ func parseGlob(t *Template, pattern string) (*Template, error) {
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return nil, err
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}
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if len(filenames) == 0 {
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return nil, fmt.Errorf("template: pattern matches no files: %#q", pattern)
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return nil, fmt.Errorf("html/template: pattern matches no files: %#q", pattern)
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}
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return parseFiles(t, filenames...)
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}
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