fix: treat inline equations as atomic tokens in word-level diff - #26
Yuan-Ru-Lin wants to merge 4 commits into
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Inline equations are now consumed as a single token up to the closing `$`, matching how block equations are already handled. A modified equation renders as a whole-equation deletion plus insertion. Fixes sou1118#25
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📝 WalkthroughWalkthroughThe tokenizer now treats inline Typst equations as single atomic tokens. It consumes content through the next ChangesInline equation tokenization
Priority: ➖ Normal Estimated code review effort: 1 (Trivial) | ~5 minutes Severity of issue fixed: Medium Merge Risk: 🟡 Moderate · up to Inline equations containing escaped or quoted dollar signs can still produce invalid Typst output. Equation-boundary handling and regression coverage should be corrected before merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🟡 Changes recommended
The new $...$ scanning currently risks mis-tokenizing escaped literal dollars (\ $) and lacks targeted unit tests for the newly introduced tokenizer behavior.
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Pull request overview
This PR updates the word-level diff tokenizer to treat inline Typst equations ($...$) as a single atomic token, preventing diffs from splitting equations into multiple deletion/insertion spans and producing invalid Typst output (e.g., unclosed $ delimiters).
Changes:
- Extend
tokenize_mixedto consume inline equations as one token up to the closing$. - Align inline-equation behavior with existing atomic-token handling for other Typst constructs (e.g.,
#func[...],@ref,<label>).
File summaries
| File | Description |
|---|---|
src/diff.rs |
Adds inline-equation $...$ atomic tokenization to prevent invalid diff output when equations are modified/deleted. |
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Actionable comments posted: 1
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Inline comments:
In `@src/diff.rs`:
- Around line 187-189: Update tokenize_mixed’s equation-boundary scan to use
Typst-aware boundaries, skipping escaped dollar signs and dollar signs inside
quoted math strings before ending an equation. Preserve valid equation
splitting, and add regression tests covering both escaped and quoted dollar
cases so render_spans receives balanced spans.
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src/diff.rs
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A `$` preceded by a backslash is a literal dollar sign in markup, not a math delimiter. Also add unit tests for the atomic equation token and the escaped case.
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🟡 Changes recommended
The new $ handling mis-detects escaping with multiple backslashes and can prematurely terminate on escaped \\$ inside math, which can still lead to invalid tokenization.
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`\\$x$` has an even number of backslashes, so the `$` is a real opening delimiter; `$a \$ b$` contains an escaped dollar sign that must not terminate the equation early. Count trailing backslashes with a small helper and treat the `$` as escaped only when the count is odd. Tests cover both cases. Assisted-by: Claude Fable 5.1
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🟢 Approval recommended
The change is localized, matches the reported failure mode, and includes focused unit tests for both the core behavior and escaping edge cases.
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@Yuan-Ru-Lin Can you give #28 a try? It might solve your problem. |
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Hi @imphil, thanks for the pointer! I checked out #28 and ran the #25 example through it, but the output is unchanged and compilation still fails with unclosed delimiter. Looking at the diff, #28 makes backslash escapes and backtick raw text atomic, but there's no |
Inline equations are now consumed as a single token up to the closing
$, matching how block equations are already handled. A modifiedequation renders as a whole-equation deletion plus insertion.
Fixes #25
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