update

node_modules/markdown-it/lib/rules_inline/emphasis.js

@@ -0,0 +1,127 @@
+// Process *this* and _that_
+//
+'use strict';
+
+
+// Insert each marker as a separate text token, and add it to delimiter list
+//
+module.exports.tokenize = function emphasis(state, silent) {
+  var i, scanned, token,
+      start = state.pos,
+      marker = state.src.charCodeAt(start);
+
+  if (silent) { return false; }
+
+  if (marker !== 0x5F /* _ */ && marker !== 0x2A /* * */) { return false; }
+
+  scanned = state.scanDelims(state.pos, marker === 0x2A);
+
+  for (i = 0; i < scanned.length; i++) {
+    token         = state.push('text', '', 0);
+    token.content = String.fromCharCode(marker);
+
+    state.delimiters.push({
+      // Char code of the starting marker (number).
+      //
+      marker: marker,
+
+      // Total length of these series of delimiters.
+      //
+      length: scanned.length,
+
+      // An amount of characters before this one that's equivalent to
+      // current one. In plain English: if this delimiter does not open
+      // an emphasis, neither do previous `jump` characters.
+      //
+      // Used to skip sequences like "*****" in one step, for 1st asterisk
+      // value will be 0, for 2nd it's 1 and so on.
+      //
+      jump:   i,
+
+      // A position of the token this delimiter corresponds to.
+      //
+      token:  state.tokens.length - 1,
+
+      // Token level.
+      //
+      level:  state.level,
+
+      // If this delimiter is matched as a valid opener, `end` will be
+      // equal to its position, otherwise it's `-1`.
+      //
+      end:    -1,
+
+      // Boolean flags that determine if this delimiter could open or close
+      // an emphasis.
+      //
+      open:   scanned.can_open,
+      close:  scanned.can_close
+    });
+  }
+
+  state.pos += scanned.length;
+
+  return true;
+};
+
+
+// Walk through delimiter list and replace text tokens with tags
+//
+module.exports.postProcess = function emphasis(state) {
+  var i,
+      startDelim,
+      endDelim,
+      token,
+      ch,
+      isStrong,
+      delimiters = state.delimiters,
+      max = state.delimiters.length;
+
+  for (i = max - 1; i >= 0; i--) {
+    startDelim = delimiters[i];
+
+    if (startDelim.marker !== 0x5F/* _ */ && startDelim.marker !== 0x2A/* * */) {
+      continue;
+    }
+
+    // Process only opening markers
+    if (startDelim.end === -1) {
+      continue;
+    }
+
+    endDelim = delimiters[startDelim.end];
+
+    // If the previous delimiter has the same marker and is adjacent to this one,
+    // merge those into one strong delimiter.
+    //
+    // `<em><em>whatever</em></em>` -> `<strong>whatever</strong>`
+    //
+    isStrong = i > 0 &&
+               delimiters[i - 1].end === startDelim.end + 1 &&
+               delimiters[i - 1].token === startDelim.token - 1 &&
+               delimiters[startDelim.end + 1].token === endDelim.token + 1 &&
+               delimiters[i - 1].marker === startDelim.marker;
+
+    ch = String.fromCharCode(startDelim.marker);
+
+    token         = state.tokens[startDelim.token];
+    token.type    = isStrong ? 'strong_open' : 'em_open';
+    token.tag     = isStrong ? 'strong' : 'em';
+    token.nesting = 1;
+    token.markup  = isStrong ? ch + ch : ch;
+    token.content = '';
+
+    token         = state.tokens[endDelim.token];
+    token.type    = isStrong ? 'strong_close' : 'em_close';
+    token.tag     = isStrong ? 'strong' : 'em';
+    token.nesting = -1;
+    token.markup  = isStrong ? ch + ch : ch;
+    token.content = '';
+
+    if (isStrong) {
+      state.tokens[delimiters[i - 1].token].content = '';
+      state.tokens[delimiters[startDelim.end + 1].token].content = '';
+      i--;
+    }
+  }
+};