Andreas Kling 8cdfbfed49 LibUnicode+LibWeb: Add fast path grapheme segmenter for ASCII text ...

For ASCII text, every character is its own grapheme - there are no
combining characters or emoji sequences. This means grapheme boundary
detection is trivial: next_boundary(i) is simply i+1.

This commit adds AsciiGraphemeSegmenter, a simple Segmenter subclass
that performs O(1) boundary lookups without any ICU overhead.

TextNode::grapheme_segmenter() now checks if the text is ASCII and uses
this fast path, avoiding expensive ICU BreakIterator cloning and
boundary detection for the common case of ASCII-only text.

2026-01-11 11:10:19 +01:00

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