388 lines
9.9 KiB
Go
388 lines
9.9 KiB
Go
// Copyright 2010 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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package html
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"runtime"
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"sort"
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"strings"
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"testing"
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"golang.org/x/net/html/atom"
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)
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// readParseTest reads a single test case from r.
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func readParseTest(r *bufio.Reader) (text, want, context string, err error) {
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line, err := r.ReadSlice('\n')
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if err != nil {
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return "", "", "", err
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}
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var b []byte
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// Read the HTML.
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if string(line) != "#data\n" {
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return "", "", "", fmt.Errorf(`got %q want "#data\n"`, line)
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}
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for {
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line, err = r.ReadSlice('\n')
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if err != nil {
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return "", "", "", err
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}
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if line[0] == '#' {
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break
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}
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b = append(b, line...)
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}
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text = strings.TrimSuffix(string(b), "\n")
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b = b[:0]
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// Skip the error list.
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if string(line) != "#errors\n" {
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return "", "", "", fmt.Errorf(`got %q want "#errors\n"`, line)
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}
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for {
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line, err = r.ReadSlice('\n')
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if err != nil {
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return "", "", "", err
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}
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if line[0] == '#' {
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break
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}
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}
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if string(line) == "#document-fragment\n" {
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line, err = r.ReadSlice('\n')
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if err != nil {
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return "", "", "", err
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}
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context = strings.TrimSpace(string(line))
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line, err = r.ReadSlice('\n')
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if err != nil {
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return "", "", "", err
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}
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}
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// Read the dump of what the parse tree should be.
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if string(line) != "#document\n" {
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return "", "", "", fmt.Errorf(`got %q want "#document\n"`, line)
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}
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inQuote := false
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for {
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line, err = r.ReadSlice('\n')
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if err != nil && err != io.EOF {
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return "", "", "", err
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}
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trimmed := bytes.Trim(line, "| \n")
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if len(trimmed) > 0 {
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if line[0] == '|' && trimmed[0] == '"' {
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inQuote = true
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}
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if trimmed[len(trimmed)-1] == '"' && !(line[0] == '|' && len(trimmed) == 1) {
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inQuote = false
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}
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}
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if len(line) == 0 || len(line) == 1 && line[0] == '\n' && !inQuote {
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break
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}
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b = append(b, line...)
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}
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return text, string(b), context, nil
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}
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func dumpIndent(w io.Writer, level int) {
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io.WriteString(w, "| ")
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for i := 0; i < level; i++ {
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io.WriteString(w, " ")
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}
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}
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type sortedAttributes []Attribute
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func (a sortedAttributes) Len() int {
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return len(a)
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}
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func (a sortedAttributes) Less(i, j int) bool {
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if a[i].Namespace != a[j].Namespace {
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return a[i].Namespace < a[j].Namespace
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}
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return a[i].Key < a[j].Key
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}
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func (a sortedAttributes) Swap(i, j int) {
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a[i], a[j] = a[j], a[i]
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}
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func dumpLevel(w io.Writer, n *Node, level int) error {
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dumpIndent(w, level)
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switch n.Type {
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case ErrorNode:
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return errors.New("unexpected ErrorNode")
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case DocumentNode:
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return errors.New("unexpected DocumentNode")
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case ElementNode:
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if n.Namespace != "" {
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fmt.Fprintf(w, "<%s %s>", n.Namespace, n.Data)
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} else {
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fmt.Fprintf(w, "<%s>", n.Data)
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}
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attr := sortedAttributes(n.Attr)
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sort.Sort(attr)
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for _, a := range attr {
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io.WriteString(w, "\n")
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dumpIndent(w, level+1)
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if a.Namespace != "" {
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fmt.Fprintf(w, `%s %s="%s"`, a.Namespace, a.Key, a.Val)
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} else {
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fmt.Fprintf(w, `%s="%s"`, a.Key, a.Val)
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}
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}
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case TextNode:
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fmt.Fprintf(w, `"%s"`, n.Data)
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case CommentNode:
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fmt.Fprintf(w, "<!-- %s -->", n.Data)
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case DoctypeNode:
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fmt.Fprintf(w, "<!DOCTYPE %s", n.Data)
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if n.Attr != nil {
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var p, s string
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for _, a := range n.Attr {
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switch a.Key {
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case "public":
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p = a.Val
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case "system":
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s = a.Val
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}
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}
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if p != "" || s != "" {
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fmt.Fprintf(w, ` "%s"`, p)
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fmt.Fprintf(w, ` "%s"`, s)
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}
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}
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io.WriteString(w, ">")
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case scopeMarkerNode:
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return errors.New("unexpected scopeMarkerNode")
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default:
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return errors.New("unknown node type")
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}
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io.WriteString(w, "\n")
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for c := n.FirstChild; c != nil; c = c.NextSibling {
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if err := dumpLevel(w, c, level+1); err != nil {
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return err
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}
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}
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return nil
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}
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func dump(n *Node) (string, error) {
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if n == nil || n.FirstChild == nil {
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return "", nil
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}
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var b bytes.Buffer
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for c := n.FirstChild; c != nil; c = c.NextSibling {
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if err := dumpLevel(&b, c, 0); err != nil {
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return "", err
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}
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}
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return b.String(), nil
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}
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const testDataDir = "testdata/webkit/"
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func TestParser(t *testing.T) {
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testFiles, err := filepath.Glob(testDataDir + "*.dat")
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if err != nil {
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t.Fatal(err)
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}
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for _, tf := range testFiles {
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f, err := os.Open(tf)
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if err != nil {
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t.Fatal(err)
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}
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defer f.Close()
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r := bufio.NewReader(f)
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for i := 0; ; i++ {
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text, want, context, err := readParseTest(r)
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if err == io.EOF {
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break
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}
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if err != nil {
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t.Fatal(err)
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}
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err = testParseCase(text, want, context)
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if err != nil {
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t.Errorf("%s test #%d %q, %s", tf, i, text, err)
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}
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}
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}
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}
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// testParseCase tests one test case from the test files. If the test does not
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// pass, it returns an error that explains the failure.
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// text is the HTML to be parsed, want is a dump of the correct parse tree,
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// and context is the name of the context node, if any.
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func testParseCase(text, want, context string) (err error) {
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defer func() {
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if x := recover(); x != nil {
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switch e := x.(type) {
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case error:
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err = e
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default:
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err = fmt.Errorf("%v", e)
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}
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}
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}()
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var doc *Node
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if context == "" {
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doc, err = Parse(strings.NewReader(text))
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if err != nil {
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return err
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}
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} else {
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contextNode := &Node{
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Type: ElementNode,
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DataAtom: atom.Lookup([]byte(context)),
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Data: context,
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}
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nodes, err := ParseFragment(strings.NewReader(text), contextNode)
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if err != nil {
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return err
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}
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doc = &Node{
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Type: DocumentNode,
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}
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for _, n := range nodes {
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doc.AppendChild(n)
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}
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}
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if err := checkTreeConsistency(doc); err != nil {
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return err
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}
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got, err := dump(doc)
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if err != nil {
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return err
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}
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// Compare the parsed tree to the #document section.
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if got != want {
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return fmt.Errorf("got vs want:\n----\n%s----\n%s----", got, want)
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}
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if renderTestBlacklist[text] || context != "" {
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return nil
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}
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// Check that rendering and re-parsing results in an identical tree.
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pr, pw := io.Pipe()
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go func() {
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pw.CloseWithError(Render(pw, doc))
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}()
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doc1, err := Parse(pr)
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if err != nil {
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return err
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}
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got1, err := dump(doc1)
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if err != nil {
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return err
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}
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if got != got1 {
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return fmt.Errorf("got vs got1:\n----\n%s----\n%s----", got, got1)
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}
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return nil
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}
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// Some test input result in parse trees are not 'well-formed' despite
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// following the HTML5 recovery algorithms. Rendering and re-parsing such a
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// tree will not result in an exact clone of that tree. We blacklist such
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// inputs from the render test.
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var renderTestBlacklist = map[string]bool{
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// The second <a> will be reparented to the first <table>'s parent. This
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// results in an <a> whose parent is an <a>, which is not 'well-formed'.
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`<a><table><td><a><table></table><a></tr><a></table><b>X</b>C<a>Y`: true,
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// The same thing with a <p>:
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`<p><table></p>`: true,
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// More cases of <a> being reparented:
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`<a href="blah">aba<table><a href="foo">br<tr><td></td></tr>x</table>aoe`: true,
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`<a><table><a></table><p><a><div><a>`: true,
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`<a><table><td><a><table></table><a></tr><a></table><a>`: true,
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// A similar reparenting situation involving <nobr>:
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`<!DOCTYPE html><body><b><nobr>1<table><nobr></b><i><nobr>2<nobr></i>3`: true,
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// A <plaintext> element is reparented, putting it before a table.
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// A <plaintext> element can't have anything after it in HTML.
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`<table><plaintext><td>`: true,
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`<!doctype html><table><plaintext></plaintext>`: true,
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`<!doctype html><table><tbody><plaintext></plaintext>`: true,
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`<!doctype html><table><tbody><tr><plaintext></plaintext>`: true,
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// A form inside a table inside a form doesn't work either.
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`<!doctype html><form><table></form><form></table></form>`: true,
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// A script that ends at EOF may escape its own closing tag when rendered.
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`<!doctype html><script><!--<script `: true,
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`<!doctype html><script><!--<script <`: true,
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`<!doctype html><script><!--<script <a`: true,
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`<!doctype html><script><!--<script </`: true,
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`<!doctype html><script><!--<script </s`: true,
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`<!doctype html><script><!--<script </script`: true,
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`<!doctype html><script><!--<script </scripta`: true,
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`<!doctype html><script><!--<script -`: true,
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`<!doctype html><script><!--<script -a`: true,
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`<!doctype html><script><!--<script -<`: true,
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`<!doctype html><script><!--<script --`: true,
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`<!doctype html><script><!--<script --a`: true,
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`<!doctype html><script><!--<script --<`: true,
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`<script><!--<script `: true,
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`<script><!--<script <a`: true,
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`<script><!--<script </script`: true,
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`<script><!--<script </scripta`: true,
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`<script><!--<script -`: true,
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`<script><!--<script -a`: true,
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`<script><!--<script --`: true,
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`<script><!--<script --a`: true,
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`<script><!--<script <`: true,
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`<script><!--<script </`: true,
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`<script><!--<script </s`: true,
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// Reconstructing the active formatting elements results in a <plaintext>
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// element that contains an <a> element.
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`<!doctype html><p><a><plaintext>b`: true,
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}
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func TestNodeConsistency(t *testing.T) {
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// inconsistentNode is a Node whose DataAtom and Data do not agree.
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inconsistentNode := &Node{
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Type: ElementNode,
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DataAtom: atom.Frameset,
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Data: "table",
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}
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_, err := ParseFragment(strings.NewReader("<p>hello</p>"), inconsistentNode)
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if err == nil {
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t.Errorf("got nil error, want non-nil")
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}
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}
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func BenchmarkParser(b *testing.B) {
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buf, err := ioutil.ReadFile("testdata/go1.html")
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if err != nil {
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b.Fatalf("could not read testdata/go1.html: %v", err)
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}
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b.SetBytes(int64(len(buf)))
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runtime.GC()
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b.ReportAllocs()
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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Parse(bytes.NewBuffer(buf))
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}
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}
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