@mapbox/jsxtreme-markdown/vendor/remark-parse/lib/unescape.js

Transform Markdown into JSX or React component modules

'use strict';

module.exports = factory;

var backslash = '\\';

// Factory to de-escape a value, based on a list at `key` in `ctx`.
function factory(ctx, key) {
  return unescape;

  // De-escape a string using the expression at `key` in `ctx`.
  function unescape(value) {
    var previous = 0;
    var index = value.indexOf(backslash);
    var escape = ctx[key];
    var queue = [];
    var character;

    while (index !== -1) {
      queue.push(value.slice(previous, index));
      previous = index + 1;
      character = value.charAt(previous);

      // If the following character is not a valid escape, add the slash.
      if (!character || escape.indexOf(character) === -1) {
        queue.push(backslash);
      }

      index = value.indexOf(backslash, previous + 1);
    }

    queue.push(value.slice(previous));

    return queue.join('');
  }
}