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Viewing file:     index.js (3.27 KB)      -rw-r--r--

'use strict';


module.exports = function ins_plugin(md) {
  // Insert each marker as a separate text token, and add it to delimiter list
  //
  function tokenize(state, silent) {
    var i, scanned, token, len, ch,
        start = state.pos,
        marker = state.src.charCodeAt(start);

    if (silent) { return false; }

    if (marker !== 0x3D/* = */) { return false; }

    scanned = state.scanDelims(state.pos, true);
    len = scanned.length;
    ch = String.fromCharCode(marker);

    if (len < 2) { return false; }

    if (len % 2) {
      token         = state.push('text', '', 0);
      token.content = ch;
      len--;
    }

    for (i = 0; i < len; i += 2) {
      token         = state.push('text', '', 0);
      token.content = ch + ch;

      if (!scanned.can_open && !scanned.can_close) { continue; }

      state.delimiters.push({
        marker: marker,
        length: 0,     // disable "rule of 3" length checks meant for emphasis
        jump:   i / 2, // 1 delimiter = 2 characters
        token:  state.tokens.length - 1,
        end:    -1,
        open:   scanned.can_open,
        close:  scanned.can_close
      });
    }

    state.pos += scanned.length;

    return true;
  }


  // Walk through delimiter list and replace text tokens with tags
  //
  function postProcess(state, delimiters) {
    var i, j,
        startDelim,
        endDelim,
        token,
        loneMarkers = [],
        max = delimiters.length;

    for (i = 0; i < max; i++) {
      startDelim = delimiters[i];

      if (startDelim.marker !== 0x3D/* = */) {
        continue;
      }

      if (startDelim.end === -1) {
        continue;
      }

      endDelim = delimiters[startDelim.end];

      token         = state.tokens[startDelim.token];
      token.type    = 'mark_open';
      token.tag     = 'mark';
      token.nesting = 1;
      token.markup  = '==';
      token.content = '';

      token         = state.tokens[endDelim.token];
      token.type    = 'mark_close';
      token.tag     = 'mark';
      token.nesting = -1;
      token.markup  = '==';
      token.content = '';

      if (state.tokens[endDelim.token - 1].type === 'text' &&
          state.tokens[endDelim.token - 1].content === '=') {

        loneMarkers.push(endDelim.token - 1);
      }
    }

    // If a marker sequence has an odd number of characters, it's splitted
    // like this: `~~~~~` -> `~` + `~~` + `~~`, leaving one marker at the
    // start of the sequence.
    //
    // So, we have to move all those markers after subsequent s_close tags.
    //
    while (loneMarkers.length) {
      i = loneMarkers.pop();
      j = i + 1;

      while (j < state.tokens.length && state.tokens[j].type === 'mark_close') {
        j++;
      }

      j--;

      if (i !== j) {
        token = state.tokens[j];
        state.tokens[j] = state.tokens[i];
        state.tokens[i] = token;
      }
    }
  }

  md.inline.ruler.before('emphasis', 'mark', tokenize);
  md.inline.ruler2.before('emphasis', 'mark', function (state) {
    var curr,
        tokens_meta = state.tokens_meta,
        max = (state.tokens_meta || []).length;

    postProcess(state, state.delimiters);

    for (curr = 0; curr < max; curr++) {
      if (tokens_meta[curr] && tokens_meta[curr].delimiters) {
        postProcess(state, tokens_meta[curr].delimiters);
      }
    }
  });
};