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Viewing file:     replace.js (2.65 KB)      -rw-r--r--

// Emojies & shortcuts replacement logic.
//
// Note: In theory, it could be faster to parse :smile: in inline chain and
// leave only shortcuts here. But, who care...
//

'use strict';


module.exports = function create_rule(md, emojies, shortcuts, scanRE, replaceRE) {
  var arrayReplaceAt = md.utils.arrayReplaceAt,
      ucm = md.utils.lib.ucmicro,
      ZPCc = new RegExp([ ucm.Z.source, ucm.P.source, ucm.Cc.source ].join('|'));

  function splitTextToken(text, level, Token) {
    var token, last_pos = 0, nodes = [];

    text.replace(replaceRE, function (match, offset, src) {
      var emoji_name;
      // Validate emoji name
      if (shortcuts.hasOwnProperty(match)) {
        // replace shortcut with full name
        emoji_name = shortcuts[match];

        // Don't allow letters before any shortcut (as in no ":/" in http://)
        if (offset > 0 && !ZPCc.test(src[offset - 1])) {
          return;
        }

        // Don't allow letters after any shortcut
        if (offset + match.length < src.length && !ZPCc.test(src[offset + match.length])) {
          return;
        }
      } else {
        emoji_name = match.slice(1, -1);
      }

      // Add new tokens to pending list
      if (offset > last_pos) {
        token         = new Token('text', '', 0);
        token.content = text.slice(last_pos, offset);
        nodes.push(token);
      }

      token         = new Token('emoji', '', 0);
      token.markup  = emoji_name;
      token.content = emojies[emoji_name];
      nodes.push(token);

      last_pos = offset + match.length;
    });

    if (last_pos < text.length) {
      token         = new Token('text', '', 0);
      token.content = text.slice(last_pos);
      nodes.push(token);
    }

    return nodes;
  }

  return function emoji_replace(state) {
    var i, j, l, tokens, token,
        blockTokens = state.tokens,
        autolinkLevel = 0;

    for (j = 0, l = blockTokens.length; j < l; j++) {
      if (blockTokens[j].type !== 'inline') { continue; }
      tokens = blockTokens[j].children;

      // We scan from the end, to keep position when new tags added.
      // Use reversed logic in links start/end match
      for (i = tokens.length - 1; i >= 0; i--) {
        token = tokens[i];

        if (token.type === 'link_open' || token.type === 'link_close') {
          if (token.info === 'auto') { autolinkLevel -= token.nesting; }
        }

        if (token.type === 'text' && autolinkLevel === 0 && scanRE.test(token.content)) {
          // replace current node
          blockTokens[j].children = tokens = arrayReplaceAt(
            tokens, i, splitTextToken(token.content, token.level, state.Token)
          );
        }
      }
    }
  };
};