html: support #script-(on|off) directives for tests

Those directives are now supported by html5lib-tests.
See: https://github.com/html5lib/html5lib-tests/blob/e52ff68cc7113a6ef3687747fa82691079bf9cc5/tree-construction/README.md

Also, this fixes missing opts on parsing for identical check

Change-Id: I92f2398ebda0477fd7f6bb438c54f3948063c08d
Reviewed-on: https://go-review.googlesource.com/c/net/+/206118
Run-TryBot: Kunpei Sakai <namusyaka@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Nigel Tao <nigeltao@golang.org>

html/parse_test.go

@@ -21,66 +21,92 @@ import (
 	"golang.org/x/net/html/atom"
 )
 
+type testAttrs struct {
+	text, want, context string
+	scripting           bool
+}
+
 // readParseTest reads a single test case from r.
-func readParseTest(r *bufio.Reader) (text, want, context string, err error) {
+func readParseTest(r *bufio.Reader) (*testAttrs, error) {
+	ta := &testAttrs{scripting: true}
 	line, err := r.ReadSlice('\n')
 	if err != nil {
-		return "", "", "", err
+		return nil, err
 	}
 	var b []byte
 
 	// Read the HTML.
 	if string(line) != "#data\n" {
-		return "", "", "", fmt.Errorf(`got %q want "#data\n"`, line)
+		return nil, fmt.Errorf(`got %q want "#data\n"`, line)
 	}
 	for {
 		line, err = r.ReadSlice('\n')
 		if err != nil {
-			return "", "", "", err
+			return nil, err
 		}
 		if line[0] == '#' {
 			break
 		}
 		b = append(b, line...)
 	}
-	text = strings.TrimSuffix(string(b), "\n")
+	ta.text = strings.TrimSuffix(string(b), "\n")
 	b = b[:0]
 
 	// Skip the error list.
 	if string(line) != "#errors\n" {
-		return "", "", "", fmt.Errorf(`got %q want "#errors\n"`, line)
+		return nil, fmt.Errorf(`got %q want "#errors\n"`, line)
 	}
 	for {
 		line, err = r.ReadSlice('\n')
 		if err != nil {
-			return "", "", "", err
+			return nil, err
 		}
 		if line[0] == '#' {
 			break
 		}
 	}
 
+	if ls := string(line); strings.HasPrefix(ls, "#script-") {
+		switch {
+		case strings.HasSuffix(ls, "-on\n"):
+			ta.scripting = true
+		case strings.HasSuffix(ls, "-off\n"):
+			ta.scripting = false
+		default:
+			return nil, fmt.Errorf(`got %q, want "#script-on" or "#script-off"`, line)
+		}
+		for {
+			line, err = r.ReadSlice('\n')
+			if err != nil {
+				return nil, err
+			}
+			if line[0] == '#' {
+				break
+			}
+		}
+	}
+
 	if string(line) == "#document-fragment\n" {
 		line, err = r.ReadSlice('\n')
 		if err != nil {
-			return "", "", "", err
+			return nil, err
 		}
-		context = strings.TrimSpace(string(line))
+		ta.context = strings.TrimSpace(string(line))
 		line, err = r.ReadSlice('\n')
 		if err != nil {
-			return "", "", "", err
+			return nil, err
 		}
 	}
 
 	// Read the dump of what the parse tree should be.
 	if string(line) != "#document\n" {
-		return "", "", "", fmt.Errorf(`got %q want "#document\n"`, line)
+		return nil, fmt.Errorf(`got %q want "#document\n"`, line)
 	}
 	inQuote := false
 	for {
 		line, err = r.ReadSlice('\n')
 		if err != nil && err != io.EOF {
-			return "", "", "", err
+			return nil, err
 		}
 		trimmed := bytes.Trim(line, "| \n")
 		if len(trimmed) > 0 {
@@ -96,7 +122,8 @@ func readParseTest(r *bufio.Reader) (text, want, context string, err error) {
 		}
 		b = append(b, line...)
 	}
-	return text, string(b), context, nil
+	ta.want = string(b)
+	return ta, nil
 }
 
 func dumpIndent(w io.Writer, level int) {
@@ -220,18 +247,18 @@ func TestParser(t *testing.T) {
 			r := bufio.NewReader(f)
 
 			for i := 0; ; i++ {
-				text, want, context, err := readParseTest(r)
+				ta, err := readParseTest(r)
 				if err == io.EOF {
 					break
 				}
 				if err != nil {
 					t.Fatal(err)
 				}
 
-				err = testParseCase(text, want, context)
+				err = testParseCase(ta.text, ta.want, ta.context, ParseOptionEnableScripting(ta.scripting))
 
 				if err != nil {
-					t.Errorf("%s test #%d %q, %s", tf, i, text, err)
+					t.Errorf("%s test #%d %q, %s", tf, i, ta.text, err)
 				}
 			}
 		}
@@ -319,7 +346,7 @@ func testParseCase(text, want, context string, opts ...ParseOption) (err error)
 	go func() {
 		pw.CloseWithError(Render(pw, doc))
 	}()
-	doc1, err := Parse(pr)
+	doc1, err := ParseWithOptions(pr, opts...)
 	if err != nil {
 		return err
 	}