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Fix markdown-it text centering delmiter conflict #2921

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Merged
Incogdino merged 2 commits into from
Aug 27, 2026
+23 −6
Merged

Fix markdown-it text centering delmiter conflict #2921

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796cf98
Update centertext plugin to use negative sentinel markers
Incogdino Aug 26, 2026
8b6f079
Updtate docs
Incogdino Aug 27, 2026
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17 changes: 11 additions & 6 deletions packages/core/src/lib/markdown-it/plugins/markdown-it-center-text.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,11 @@
import MarkdownIt from 'markdown-it';
import StateInline from 'markdown-it/lib/rules_inline/state_inline';

// Delimiter markers are non-negative character codes, so negative sentinels
// used not to collide with markers used by other inline rules.
const CENTERTEXT_OPEN_MARKER = -1;
const CENTERTEXT_CLOSE_MARKER = -2;

/**
* A markdown-it plugin to center text using the syntax ->text<-
*/
Expand All @@ -48,7 +53,7 @@ export function centertext_plugin(md: MarkdownIt): void {
token = state.push('text', '', 0);
token.content = '->';
state.delimiters.push({
marker: 45, // CHANGED: Use character code 45 instead of string '->'
marker: CENTERTEXT_OPEN_MARKER,
jump: 0,
token: state.tokens.length - 1,
length: 2,
Expand All @@ -64,7 +69,7 @@ export function centertext_plugin(md: MarkdownIt): void {
token = state.push('text', '', 0);
token.content = '<-';
state.delimiters.push({
marker: 60, // CHANGED: Use character code 60 instead of string '<-'
marker: CENTERTEXT_CLOSE_MARKER,
jump: 0,
token: state.tokens.length - 1,
length: 2,
Expand Down Expand Up @@ -94,17 +99,17 @@ export function centertext_plugin(md: MarkdownIt): void {

for (i = 0; i < max; i++) {
delim = delimiters[i];
if (delim.marker === 45/* - */) {
if (delim.marker === CENTERTEXT_OPEN_MARKER) {
foundStart = true;
} else if (delim.marker === 60/* < */) {
} else if (delim.marker === CENTERTEXT_CLOSE_MARKER) {
foundEnd = true;
}
}
if (foundStart && foundEnd) {
for (i = 0; i < max; i++) {
delim = delimiters[i];

if (delim.marker === 45/* - */) {
if (delim.marker === CENTERTEXT_OPEN_MARKER) {
foundStart = true;
token = state.tokens[delim.token];
token.type = 'centertext_open';
Expand All @@ -113,7 +118,7 @@ export function centertext_plugin(md: MarkdownIt): void {
token.markup = '->';
token.content = '';
token.attrs = [['class', 'text-center']];
} else if (delim.marker === 60/* < */) {
} else if (delim.marker === CENTERTEXT_CLOSE_MARKER) {
if (foundStart) {
token = state.tokens[delim.token];
token.type = 'centertext_close';
Expand Down
12 changes: 12 additions & 0 deletions packages/core/test/unit/lib/markdown-it/plugins/markdown-it-center-text.test.ts
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Original file line number Diff line number Diff line change
@@ -1,6 +1,9 @@
import markdownIt from 'markdown-it';

import { centertext_plugin } from '../../../../../src/lib/markdown-it/plugins/markdown-it-center-text.js';
import {
createDoubleDelimiterInlineRule,
} from '../../../../../src/lib/markdown-it/plugins/markdown-it-double-delimiter.js';

describe('markdown-it-center-text plugin', () => {
let md: markdownIt;
Expand Down Expand Up @@ -72,4 +75,13 @@ describe('markdown-it-center-text plugin', () => {
// which is possibly not schematicallly correct
expect(result).toContain('reversed');
});

test('should not collide with the "--" small-text rule sharing the same "-" character', () => {
const mdWithSmall = markdownIt();
mdWithSmall.use(createDoubleDelimiterInlineRule('--', 'small', 'emphasis'));
mdWithSmall.use(centertext_plugin);

expect(mdWithSmall.renderInline('--Small--, ->Center-align<-'))
.toBe('<span class="small">Small</span>, <div class="text-center">Center-align</div>');
});
});
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