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emozilla
708d2a0c33
Five distinct bugs surfaced from a math-heavy stress test:
1. Adjacent code fences glued together. scrubBacktickNoise's
second-pass regex /``\s*``/g matched the LAST 2 backticks of
one fence + whitespace + FIRST 2 backticks of the next, collapsing
two blocks into one. Fixed with lookbehind/lookahead so we only
match exactly 2 backticks not part of a longer run.
2. Whitespace eaten between fences and following content.
stripPreviewTargets internally calls .trim() which strips leading/
trailing whitespace from each split-segment. For segments between
two fences this collapsed \n\n to '', gluing fence close to next
block. Fixed by capturing leading/trailing whitespace at the call
site and restoring it after the transform.
3. Currency dollar signs eaten as math. With singleDollarTextMath:true
remark-math greedy-matched any pair of $, so '$5 ... $10' became
one inline math span. Added escapeCurrencyDollars to escape $<digit>
patterns to \$<digit> in prose segments (not in code). Trade-off:
math expressions starting with a digit (rare — '$5x = 10$') get
escaped too. Mirrors the convention in ChatGPT/Claude's UIs.
4. \(...\) and \[...\] LaTeX brackets unsupported. Models often
emit these instead of $...$ / $$...$$. Added
rewriteLatexBracketDelimiters preprocessor pass.
5. ```latex / ```tex blocks were being routed to KaTeX via a
rewrite to ```math. Aligns with GitHub markdown convention:
```math = render as math; ```latex / ```tex = LaTeX/TeX
source code (syntax highlighted, not rendered). Conflating them
broke teaching/showing-source use cases. MATH_FENCE_LANGUAGES
pruned to {'math'} only.
Also flipped parseIncompleteMarkdown to true (was !isStreaming) so
the math parser can't see $ inside streaming-but-not-yet-closed code
fences. Shiki was already deferred via defer={isStreaming} so this
doesn't introduce new tokenization cost.
Test: 18/18 existing tests still pass; one test updated to expect
escaped \$ in currency-prose-with-URL case.