All files / src/lib/markdown-it/utils index.ts

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/*
  Extra utility functions related to markdown-it.
  markdown-it library exposes a utility module in markdown-it/utils,
  below are additional functions that can be used as helpers alongside markdown-it/utils
 */
 
// This mapping is taken from markdown-it/utils, just flipped.
// Refer to the original file at markdown-it/lib/common/utils.js
const htmlUnescapedMapping = {
  '&': '&',
  '&lt;': '<',
  '&gt;': '>',
  '&quot;': '"',
  '&#x27;': '\'',
};
 
// markdown-it/utils have an escapeHtml function, but not the
// complementary un-escaping function
 
// Used in highlighting calculations since
// markdown-it stores text as escaped HTML entities (e.g. &lt;, &gt;).
// To correctly measure character positions and split text for partial
// highlights, we must first decode entities back into their real characters.
 
/**
 * Replaces HTML escape sequences in the input string with their corresponding unescaped characters.
 */
export function unescapeHtml(str: string) {
  let unescaped = str;
  Object.entries(htmlUnescapedMapping).forEach(([key, value]) => {
    unescaped = unescaped.split(key).join(value);
  });
  return unescaped;
}