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html: refactor the blacklist for the "render and re-parse" test.

Browse source 
R=andybalholm
CC=golang-dev, mikesamuel
https://golang.org/cl/5331056
This commit is contained in:
Nigel Tao 2011-11-02 09:42:25 +11:00
parent f753e3facd
commit 90b76c0f3e
2 changed files with 35 additions and 16 deletions
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20
src/pkg/html/parse_test.go
View file

@ -160,14 +160,10 @@ func TestParser(t *testing.T) {
t.Errorf("%s test #%d %q, got vs want:\n----\n%s----\n%s----", filename, i, text, got, want)
continue
}
// Check that rendering and re-parsing results in an identical tree.
if filename == "tests1.dat" && (i == 30 || i == 77) {
// Some tests in tests1.dat have such messed-up markup that a correct parse
// results in a non-conforming tree (one <a> element nested inside another).
// Therefore when it is rendered and re-parsed, it isn't the same.
// So we skip rendering on that test.
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))
@ -187,3 +183,15 @@ func TestParser(t *testing.T) {
}
}
}
// 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,
// The second <a> will be reparented, similar to the case above.
`<a href="blah">aba<table><a href="foo">br<tr><td></td></tr>x</table>aoe`: true,
}

31
src/pkg/html/render.go
View file

@ -19,17 +19,28 @@ type writer interface {
// Render renders the parse tree n to the given writer.
//
// For 'well-formed' parse trees, calling Parse on the output of Render will
// result in a clone of the original tree.
// Rendering is done on a 'best effort' basis: calling Parse on the output of
// Render will always result in something similar to the original tree, but it
// is not necessarily an exact clone unless the original tree was 'well-formed'.
// 'Well-formed' is not easily specified; the HTML5 specification is
// complicated.
//
// 'Well-formed' is not formally specified, but calling Parse on arbitrary
// input results in a 'well-formed' parse tree if Parse does not return an
// error. Programmatically constructed trees are typically also 'well-formed',
// but it is possible to construct a tree that, when rendered and re-parsed,
// results in a different tree. A simple example is that a solitary text node
// would become a tree containing <html>, <head> and <body> elements. Another
// example is that the programmatic equivalent of "a<head>b</head>c" becomes
// "<html><head><head/><body>abc</body></html>".
// Calling Parse on arbitrary input typically results in a 'well-formed' parse
// tree. However, it is possible for Parse to yield a 'badly-formed' parse tree.
// For example, in a 'well-formed' parse tree, no <a> element is a child of
// another <a> element: parsing "<a><a>" results in two sibling elements.
// Similarly, in a 'well-formed' parse tree, no <a> element is a child of a
// <table> element: parsing "<p><table><a>" results in a <p> with two sibling
// children; the <a> is reparented to the <table>'s parent. However, calling
// Parse on "<a><table><a>" does not return an error, but the result has an <a>
// element with an <a> child, and is therefore not 'well-formed'.
//
// Programmatically constructed trees are typically also 'well-formed', but it
// is possible to construct a tree that looks innocuous but, when rendered and
// re-parsed, results in a different tree. A simple example is that a solitary
// text node would become a tree containing <html>, <head> and <body> elements.
// Another example is that the programmatic equivalent of "a<head>b</head>c"
// becomes "<html><head><head/><body>abc</body></html>".
func Render(w io.Writer, n *Node) os.Error {
if x, ok := w.(writer); ok {
return render(x, n)