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layout: Rewrite whitespace stripping.

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This patch makes Servo unconditionally strip whitespace before text run
scanning (assuming that the `white-space` property allows it). Whitespace
stripping during reflow is now only used for handling whitespace at the ends of
lines; reflow now never attempts to handle ignorable whitespace.

Many CSS tests pass now. There are some new failures, however.

The following reference tests now fail due to a pre-existing bug whereby
whitespace is used to calculate the position of inline hypothetical boxes for
elements with `display: inline; position: absolute`:

* `absolute-replaced-height-036.htm`
* `vertical-align-sub-001.htm`
* `vertical-align-super-001.htm`

The following reference tests fail due to a pre-existing bug whereby we don't
handle `font-size: 0` properly in inline reflow:

* `font-size-zero-1.htm`
* `font-size-zero-2.htm`

The following reference test fails due to the fact that it relied on our
incorrect insertion of whitespace to make room for the black background:

* `inline-formatting-context-007.htm`
This commit is contained in:
Patrick Walton 2015-08-05 09:28:39 -07:00
parent 9c528c6382
commit ae378a8c3e
34 changed files with 216 additions and 181 deletions
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11
components/layout/text.rs
View file

@ -90,7 +90,7 @@ impl TextRunScanner {
// FIXME(pcwalton): We want to be sure not to allocate multiple times, since this is a
// performance-critical spot, but this may overestimate and allocate too much memory.
let mut new_fragments = Vec::with_capacity(fragments.len());
let mut last_whitespace = true;
let mut last_whitespace = false;
let mut paragraph_bytes_processed = 0;
while !fragments.is_empty() {
@ -142,7 +142,7 @@ impl TextRunScanner {
debug_assert!(self.clump.len() == 1,
"WAT: can't coalesce non-text nodes in flush_clump_to_list()!");
out_fragments.push(self.clump.pop_front().unwrap());
return last_whitespace
return false
}
}
@ -398,14 +398,13 @@ fn split_first_fragment_at_newline_if_necessary(fragments: &mut LinkedList<Fragm
};
string_before =
unscanned_text_fragment_info.text[..(position + 1)].to_owned().into_boxed_slice();
unscanned_text_fragment_info.text[..(position + 1)].to_owned();
unscanned_text_fragment_info.text =
unscanned_text_fragment_info.text[(position + 1)..].to_owned().into_boxed_slice();
}
first_fragment.transform(first_fragment.border_box.size,
SpecificFragmentInfo::UnscannedText(UnscannedTextFragmentInfo {
text: string_before,
}))
SpecificFragmentInfo::UnscannedText(
UnscannedTextFragmentInfo::from_text(string_before)))
};
fragments.push_front(new_fragment);