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display-math newline preservation (Option A ruling 2026-09-27): inline spans restore all six debris chars, display spans keep real newlines — multi-line equations never corrupted; \right/\rho CR-debris still restores; sloppy \neq-in-display accepted as the rarest slice

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amosblomqvist
2026-09-27 02:24:10 +03:00
parent 8faf97edc7
commit 921cacbb8f
2 changed files with 67 additions and 1 deletions
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src/core/math-delims.ts
+17 -1
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@@ -229,6 +229,16 @@ export function transformMathDelimiters(markdown: string): string {
* balanced `\(…\)` / `\[…\]` spans are touched — the same scanner rules as
* transformMathDelimiters (escaped delimiters are literal, unbalanced
* delimiters pass through untouched).
*
* ASYMMETRIC NEWLINE RULE (owner ruling 2026-09-27, Option A): inline spans
* restore all six debris chars — real newlines/tabs inside INLINE math
* essentially never occur (options and inline math are single-line by
* nature). Display spans restore five and KEEP real newlines — multi-line
* display math (aligned environments, equation systems) is common, and a
* real line break is byte-identical on the wire to sloppy `\neq`/`\nu`/
* `\neg`/`\nabla` (JSON `\n` resolves to a newline either way). Corrupting
* legitimate content is strictly worse than failing to repair that rarest
* slice, so display-span n-command sloppiness stays broken by design.
*/
const ESCAPE_DEBRIS: Record<string, string> = {
"\b": "\\b",
@@ -241,6 +251,11 @@ const ESCAPE_DEBRIS: Record<string, string> = {
const DEBRIS_RE = /[\b\t\n\v\f\r]/;
/** Display spans keep real newlines (multi-line equations) — debris there is
* everything except \n (a lone real \r never occurs in authored text, and
* `\right`/`\rho`/`\rangle` corruption is common in display math). */
const DISPLAY_DEBRIS_RE = /[\b\t\v\f\r]/;
export function restoreMathEscapes(text: string): string {
if (!DEBRIS_RE.test(text)) return text;
const out: string[] = [];
@@ -256,7 +271,8 @@ export function restoreMathEscapes(text: string): string {
const closeAt = findClose(text, i + open.length, close);
if (closeAt !== -1) {
const inner = text.slice(i + open.length, closeAt);
out.push(open + inner.replace(DEBRIS_RE, (c) => ESCAPE_DEBRIS[c]!) + close);
const debris = isDisplay ? DISPLAY_DEBRIS_RE : DEBRIS_RE;
out.push(open + inner.replace(debris, (c) => ESCAPE_DEBRIS[c]!) + close);
i = closeAt + close.length;
continue;
}