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Allow breaking line after space with white-space: break-spaces (#33376)

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`white-space: break-spaces` should allow a soft wrap opportunity *after*
every preserved white space. Then, to avoid breaking before the first
white space, `TextRunSegment::shape_text()` has some logic to separate
it from the following spaces and put it with the preceding text instead.

The problem was that, when combined with `word-break: keep-all`, we were
then only checking whether there were more white spaces afterwards,
ignoring the soft wrap opportunity after the first one.

Also removing a duplicated `can_break_anywhere` variable.

Signed-off-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Oriol Brufau 2024-09-10 13:06:40 +02:00 • committed by GitHub
parent 6d6cd0f2dc
commit 9d3d009895
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3 changed files with 40 additions and 4 deletions
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7
components/layout_2020/flow/inline/text_run.rs
View file

@ -225,6 +225,7 @@ impl TextRunSegment {
let mut whitespace = slice.end..slice.end;
let mut rev_char_indices = word.char_indices().rev().peekable();
let mut ends_with_whitespace = false;
let ends_with_newline = rev_char_indices
.peek()
.map_or(false, |&(_, character)| character == '\n');
@ -232,6 +233,7 @@ impl TextRunSegment {
.take_while(|&(_, character)| char_is_whitespace(character))
.last()
{
ends_with_whitespace = true;
whitespace.start = slice.start + first_white_space_index;
// If line breaking for a piece of text that has `white-space-collapse: break-spaces` there
@ -252,10 +254,7 @@ impl TextRunSegment {
// If there's no whitespace and `word-break` is set to `keep-all`, try increasing the slice.
// TODO: This should only happen for CJK text.
let can_break_anywhere = text_style.word_break == WordBreak::BreakAll ||
text_style.overflow_wrap == OverflowWrap::Anywhere ||
text_style.overflow_wrap == OverflowWrap::BreakWord;
if whitespace.is_empty() &&
if !ends_with_whitespace &&
*break_index != self.range.end &&
text_style.word_break == WordBreak::KeepAll &&
!can_break_anywhere

13
tests/wpt/meta/MANIFEST.json vendored
View file

@ -254546,6 +254546,19 @@
{}
]
],
"break-spaces-with-word-break-001.html": [
"ee31fd627130eeb40fd22d0b9bc4fa6e9eb3aca7",
[
null,
[
[
"/css/reference/ref-filled-green-100px-square.xht",
"=="
]
],
{}
]
],
"control-chars-000.html": [
"b038fe9a90d3b8b9cb3bde7fd46396c7121688c9",
[

24
tests/wpt/tests/css/css-text/white-space/break-spaces-with-word-break-001.html vendored Normal file
View file

@ -0,0 +1,24 @@
<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text Test: white-space:break-spaces + word-break:keep-all</title>
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<link rel="help" href="https://drafts.csswg.org/css-text-4/#valdef-white-space-collapse-break-spaces">
<link rel="help" href="https://drafts.csswg.org/css-text-4/#valdef-word-break-keep-all">
<link rel="match" href="../../reference/ref-filled-green-100px-square.xht">
<meta name="assert" content="break-spaces + keep-all does allow a break after space.">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
<style>
div {
font: 50px/1 Ahem;
white-space: break-spaces;
word-break: keep-all;
width: 100px;
height: 100px;
background: red;
color: green;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div>XX XX</div>