function strong_em()

in assets/js/lib-markdown.js [1374:1428]

• 24 lines of code
• 4 McCabe index (conditional complexity)

  function strong_em( tag, md ) {

    var state_slot = tag + "_state",
        other_slot = tag === "strong" ? "em_state" : "strong_state";

    function CloseTag(len) {
      this.len_after = len;
      this.name = "close_" + md;
    }

    return function ( text ) {

      if ( this[state_slot][0] === md ) {
        // Most recent em is of this type
        //D:this.debug("closing", md);
        this[state_slot].shift();

        // "Consume" everything to go back to the recrusion in the else-block below
        return[ text.length, new CloseTag(text.length-md.length) ];
      }
      else {
        // Store a clone of the em/strong states
        var other = this[other_slot].slice(),
            state = this[state_slot].slice();

        this[state_slot].unshift(md);

        //D:this.debug_indent += "  ";

        // Recurse
        var res = this.processInline( text.substr( md.length ) );
        //D:this.debug_indent = this.debug_indent.substr(2);

        var last = res[res.length - 1];

        //D:this.debug("processInline from", tag + ": ", uneval( res ) );

        var check = this[state_slot].shift();
        if ( last instanceof CloseTag ) {
          res.pop();
          // We matched! Huzzah.
          var consumed = text.length - last.len_after;
          return [ consumed, [ tag ].concat(res) ];
        }
        else {
          // Restore the state of the other kind. We might have mistakenly closed it.
          this[other_slot] = other;
          this[state_slot] = state;

          // We can't reuse the processed result as it could have wrong parsing contexts in it.
          return [ md.length, md ];
        }
      }
    }; // End returned function
  }