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// Copyright 2010 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 html
import (
"bufio"
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"testing"
)
func pipeErr(err error) io.Reader {
pr, pw := io.Pipe()
pw.CloseWithError(err)
return pr
}
func readDat(filename string, c chan io.Reader) {
defer close(c)
f, err := os.Open("testdata/webkit/" + filename)
if err != nil {
c <- pipeErr(err)
return
}
defer f.Close()
// Loop through the lines of the file. Each line beginning with "#" denotes
// a new section, which is returned as a separate io.Reader.
r := bufio.NewReader(f)
var pw *io.PipeWriter
for {
line, err := r.ReadSlice('\n')
if err != nil {
if pw != nil {
pw.CloseWithError(err)
pw = nil
} else {
c <- pipeErr(err)
}
return
}
if len(line) == 0 {
continue
}
if line[0] == '#' {
if pw != nil {
pw.Close()
}
var pr *io.PipeReader
pr, pw = io.Pipe()
c <- pr
continue
}
if line[0] != '|' {
// Strip the trailing '\n'.
line = line[:len(line)-1]
}
if pw != nil {
if _, err := pw.Write(line); err != nil {
pw.CloseWithError(err)
pw = nil
}
}
}
}
func dumpIndent(w io.Writer, level int) {
io.WriteString(w, "| ")
for i := 0; i < level; i++ {
io.WriteString(w, " ")
}
}
func dumpLevel(w io.Writer, n *Node, level int) error {
dumpIndent(w, level)
switch n.Type {
case ErrorNode:
return errors.New("unexpected ErrorNode")
case DocumentNode:
return errors.New("unexpected DocumentNode")
case ElementNode:
fmt.Fprintf(w, "<%s>", n.Data)
for _, a := range n.Attr {
io.WriteString(w, "\n")
dumpIndent(w, level+1)
fmt.Fprintf(w, `%s="%s"`, a.Key, a.Val)
}
case TextNode:
fmt.Fprintf(w, "%q", n.Data)
case CommentNode:
fmt.Fprintf(w, "<!-- %s -->", n.Data)
case DoctypeNode:
fmt.Fprintf(w, "<!DOCTYPE %s>", n.Data)
case scopeMarkerNode:
return errors.New("unexpected scopeMarkerNode")
default:
return errors.New("unknown node type")
}
io.WriteString(w, "\n")
for _, c := range n.Child {
if err := dumpLevel(w, c, level+1); err != nil {
return err
}
}
return nil
}
func dump(n *Node) (string, error) {
if n == nil || len(n.Child) == 0 {
return "", nil
}
b := bytes.NewBuffer(nil)
for _, child := range n.Child {
if err := dumpLevel(b, child, 0); err != nil {
return "", err
}
}
return b.String(), nil
}
func TestParser(t *testing.T) {
testFiles := []struct {
filename string
// n is the number of test cases to run from that file.
// -1 means all test cases.
n int
}{
// TODO(nigeltao): Process all the test cases from all the .dat files.
{"tests1.dat", 92},
{"tests2.dat", 0},
{"tests3.dat", 0},
}
for _, tf := range testFiles {
rc := make(chan io.Reader)
go readDat(tf.filename, rc)
for i := 0; i != tf.n; i++ {
// Parse the #data section.
dataReader := <-rc
if dataReader == nil {
break
}
b, err := ioutil.ReadAll(dataReader)
if err != nil {
t.Fatal(err)
}
text := string(b)
doc, err := Parse(strings.NewReader(text))
if err != nil {
t.Fatal(err)
}
got, err := dump(doc)
if err != nil {
t.Fatal(err)
}
// Skip the #error section.
if _, err := io.Copy(ioutil.Discard, <-rc); err != nil {
t.Fatal(err)
}
// Compare the parsed tree to the #document section.
b, err = ioutil.ReadAll(<-rc)
if err != nil {
t.Fatal(err)
}
if want := string(b); got != want {
t.Errorf("%s test #%d %q, got vs want:\n----\n%s----\n%s----", tf.filename, i, text, got, want)
continue
}
if renderTestBlacklist[text] {
continue
}
// Check that rendering and re-parsing results in an identical tree.
pr, pw := io.Pipe()
go func() {
pw.CloseWithError(Render(pw, doc))
}()
doc1, err := Parse(pr)
if err != nil {
t.Fatal(err)
}
got1, err := dump(doc1)
if err != nil {
t.Fatal(err)
}
if got != got1 {
t.Errorf("%s test #%d %q, got vs got1:\n----\n%s----\n%s----", tf.filename, i, text, got, got1)
continue
}
}
// Drain any untested cases for the test file.
for r := range rc {
if _, err := ioutil.ReadAll(r); err != nil {
t.Fatal(err)
}
}
}
}
// Some test input result in parse trees are not 'well-formed' despite
// following the HTML5 recovery algorithms. Rendering and re-parsing such a
// tree will not result in an exact clone of that tree. We blacklist such
// inputs from the render test.
var renderTestBlacklist = map[string]bool{
// The second <a> will be reparented to the first <table>'s parent. This
// results in an <a> whose parent is an <a>, which is not 'well-formed'.
`<a><table><td><a><table></table><a></tr><a></table><b>X</b>C<a>Y`: true,
// More cases of <a> being reparented:
`<a href="blah">aba<table><a href="foo">br<tr><td></td></tr>x</table>aoe`: true,
`<a><table><a></table><p><a><div><a>`: true,
}
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