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Viewing file:     balance_pairs.js (3.53 KB)      -rw-r--r--

// For each opening emphasis-like marker find a matching closing one
//
'use strict';


function processDelimiters(state, delimiters) {
  var closerIdx, openerIdx, closer, opener, minOpenerIdx, newMinOpenerIdx,
      isOddMatch, lastJump,
      openersBottom = {},
      max = delimiters.length;

  for (closerIdx = 0; closerIdx < max; closerIdx++) {
    closer = delimiters[closerIdx];

    // Length is only used for emphasis-specific "rule of 3",
    // if it's not defined (in strikethrough or 3rd party plugins),
    // we can default it to 0 to disable those checks.
    //
    closer.length = closer.length || 0;

    if (!closer.close) continue;

    // Previously calculated lower bounds (previous fails)
    // for each marker, each delimiter length modulo 3,
    // and for whether this closer can be an opener;
    // https://github.com/commonmark/cmark/commit/34250e12ccebdc6372b8b49c44fab57c72443460
    if (!openersBottom.hasOwnProperty(closer.marker)) {
      openersBottom[closer.marker] = [ -1, -1, -1, -1, -1, -1 ];
    }

    minOpenerIdx = openersBottom[closer.marker][(closer.open ? 3 : 0) + (closer.length % 3)];

    openerIdx = closerIdx - closer.jump - 1;

    // avoid crash if `closer.jump` is pointing outside of the array, see #742
    if (openerIdx < -1) openerIdx = -1;

    newMinOpenerIdx = openerIdx;

    for (; openerIdx > minOpenerIdx; openerIdx -= opener.jump + 1) {
      opener = delimiters[openerIdx];

      if (opener.marker !== closer.marker) continue;

      if (opener.open && opener.end < 0) {

        isOddMatch = false;

        // from spec:
        //
        // If one of the delimiters can both open and close emphasis, then the
        // sum of the lengths of the delimiter runs containing the opening and
        // closing delimiters must not be a multiple of 3 unless both lengths
        // are multiples of 3.
        //
        if (opener.close || closer.open) {
          if ((opener.length + closer.length) % 3 === 0) {
            if (opener.length % 3 !== 0 || closer.length % 3 !== 0) {
              isOddMatch = true;
            }
          }
        }

        if (!isOddMatch) {
          // If previous delimiter cannot be an opener, we can safely skip
          // the entire sequence in future checks. This is required to make
          // sure algorithm has linear complexity (see *_*_*_*_*_... case).
          //
          lastJump = openerIdx > 0 && !delimiters[openerIdx - 1].open ?
            delimiters[openerIdx - 1].jump + 1 :
            0;

          closer.jump  = closerIdx - openerIdx + lastJump;
          closer.open  = false;
          opener.end   = closerIdx;
          opener.jump  = lastJump;
          opener.close = false;
          newMinOpenerIdx = -1;
          break;
        }
      }
    }

    if (newMinOpenerIdx !== -1) {
      // If match for this delimiter run failed, we want to set lower bound for
      // future lookups. This is required to make sure algorithm has linear
      // complexity.
      //
      // See details here:
      // https://github.com/commonmark/cmark/issues/178#issuecomment-270417442
      //
      openersBottom[closer.marker][(closer.open ? 3 : 0) + ((closer.length || 0) % 3)] = newMinOpenerIdx;
    }
  }
}


module.exports = function link_pairs(state) {
  var curr,
      tokens_meta = state.tokens_meta,
      max = state.tokens_meta.length;

  processDelimiters(state, state.delimiters);

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