remark-underline/dist/remark-underline.modern.js

A remark plugin which adds underline support by repurposing the "__" token.

function attacher(options) {
  options = options ?? {}; // Prevents options from being null

  const Parser = this.Parser.prototype;
  const nodeType = options.nodeType ?? 'underline';
  const marker = options.marker ?? '__';
  const classNames = options.classNames ?? ["underline"];
  const tagType = options.tagType ?? 'ins';

  Parser.inlineTokenizers.underline = function underlineTokenizer(eat, value, silent) {
    if (value.startsWith(marker)) {
      const end = value.indexOf(marker, marker.length);

      if (end > -1) {
        if (silent) {
          return true;
        }

        const text = value.substring(marker.length, end);
        const now = eat.now();
        now.column += marker.length;
        now.offset += marker.length;
        return eat(marker + text + marker)({
          type: nodeType,
          children: this.tokenizeInline(text, now),
          data: {
            hName: tagType,
            hProperties: classNames.length ? {
              className: classNames
            } : {}
          }
        });
      }
    }

    return false;
  };

  Parser.inlineTokenizers.underline.locator = (value, fromIndex) => value.indexOf(marker, fromIndex);

  Parser.inlineMethods.splice(Parser.inlineMethods.indexOf('strong'), 0, 'underline');
}

export default attacher;
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