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38 lines
1.3 KiB
JavaScript
38 lines
1.3 KiB
JavaScript
// Showdown extension that replaces words surrounded by singular underscores with <em> tags
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export const markdownUnderscoreExt = () => {
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try {
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if (!canUseNegativeLookbehind()) {
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console.log('Showdown-underscore extension: Negative lookbehind not supported. Skipping.');
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return [];
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}
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return [{
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type: 'output',
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regex: new RegExp('(<code(?:\\s+[^>]*)?>[\\s\\S]*?<\\/code>)|\\b(?<!_)_(?!_)(.*?)(?<!_)_(?!_)\\b', 'g'),
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replace: function(match, codeContent, italicContent) {
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if (codeContent) {
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// If it's inside <code> tags, return unchanged
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return match;
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} else if (italicContent) {
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// If it's an italic group, apply the replacement
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return '<em>' + italicContent + '</em>';
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}
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// If none of the conditions are met, return the original match
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return match;
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},
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}];
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} catch (e) {
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console.error('Error in Showdown-underscore extension:', e);
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return [];
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}
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};
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function canUseNegativeLookbehind() {
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try {
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new RegExp('(?<!_)');
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return true;
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} catch (e) {
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return false;
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}
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}
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