Store parser errors, source range filenames, source code filenames,
module source, and Rust parser errors as UTF-16 where they flow back
into JavaScript-visible strings. Keep byte-oriented source buffers
byte-backed.
Remove temporary PrimitiveString, ByteString, and UTF-8 detours from
JSON, RegExp, module debug logging, print formatting, and tests.
Produce JS-visible string results as UTF-16 at their source, including
numeric formatting, BigInt and BigFraction formatting, URI encoding,
console formatting, parser errors, regular expression errors, Intl and
Temporal records, LibUnicode locale boundaries, and LibWeb bindings.
Handle fractional radix formatting through the UTF-16 builder view.
Thread UTF-16 string input through JSON, script parsing, Date parsing,
Intl option parsing, Temporal parsing, and the helper library boundaries
that feed those parsers. Preserve ASCII fast paths where the source data
is known to be ASCII.
Add a Segmenter implementation that implements the UAX#14 line breaking
rules applicable to ASCII text. This avoids the need to build an ICU
BreakIterator for the majority of text on the web.
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.
