Update CommonMark spec to 0.15 + emphasis changes

lib/rules_inline/emphasis.js

@@ -2,6 +2,9 @@
 
 'use strict';
 
+var isWhiteSpace = require('../common/utils').isWhiteSpace;
+var isPunctChar  = require('../common/utils').isPunctChar;
+
 
 function isAlphaNum(code) {
   return (code >= 0x30 /* 0 */ && code <= 0x39 /* 9 */) ||
@@ -13,6 +16,8 @@ function isAlphaNum(code) {
 // "start" should point at a valid marker
 function scanDelims(state, start) {
   var pos = start, lastChar, nextChar, count,
+      isLastWhiteSpace, isLastPunctChar,
+      isNextWhiteSpace, isNextPunctChar,
       can_open = true,
       can_close = true,
       max = state.posMax,
@@ -26,9 +31,26 @@ function scanDelims(state, start) {
 
   nextChar = pos < max ? state.src.charCodeAt(pos) : -1;
 
-  // check whitespace conditions
-  if (nextChar === 0x20 || nextChar === 0x0A) { can_open = false; }
-  if (lastChar === 0x20 || lastChar === 0x0A) { can_close = false; }
+  isLastPunctChar = lastChar >= 0 && isPunctChar(String.fromCharCode(lastChar));
+  isNextPunctChar = nextChar >= 0 && isPunctChar(String.fromCharCode(nextChar));
+  isLastWhiteSpace = lastChar >= 0 && isWhiteSpace(lastChar);
+  isNextWhiteSpace = nextChar >= 0 && isWhiteSpace(nextChar);
+
+  if (isNextWhiteSpace) {
+    can_open = false;
+  } else if (isNextPunctChar) {
+    if (!(isLastWhiteSpace || isLastPunctChar || lastChar === -1)) {
+      can_open = false;
+    }
+  }
+
+  if (isLastWhiteSpace) {
+    can_close = false;
+  } else if (isLastPunctChar) {
+    if (!(isNextWhiteSpace || isNextPunctChar || nextChar === -1)) {
+      can_close = false;
+    }
+  }
 
   if (marker === 0x5F /* _ */) {
     // check if we aren't inside the word

test/fixtures/commonmark/bad.txt

@@ -0,0 +1,16 @@
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+src line: 4653
+
+.
+* a *
+.
+<p>* a *</p>
+.
+
+error:
+
+<ul>
+<li>a *</li>
+</ul>
+
+