Fix performance when nested token doesn't match

close #53

lib/links.js

@@ -7,7 +7,7 @@
 // this function assumes that first character ("[") already matches;
 // returns the end of the label
 function parseLinkLabel(state, start) {
-  var level, found, marker, ok,
+  var level, found, marker,
       labelEnd = -1,
       max = state.posMax,
       oldPos = state.pos,
@@ -36,9 +36,7 @@ function parseLinkLabel(state, start) {
       }
     }
 
-    ok = state.parser.skipToken(state);
+    state.parser.skipToken(state);
-
-    if (!ok) { state.pos++; }
   }
 
   if (found) {

lib/parser_inline.js

@@ -79,17 +79,18 @@ ParserInline.prototype.skipToken = function (state) {
 
   if ((cached_pos = state.cacheGet(pos)) > 0) {
     state.pos = cached_pos;
-    return true;
+    return;
   }
 
   for (i = 0; i < len; i++) {
     if (rules[i](state, true)) {
       state.cacheSet(pos, state.pos);
-      return true;
+      return;
     }
   }
 
-  return false;
+  state.pos++;
+  state.cacheSet(pos, state.pos);
 };
 
 

lib/rules_inline/emphasis.js

@@ -112,7 +112,7 @@ module.exports = function emphasis(state, silent) {
       }
     }
 
-    if (!state.parser.skipToken(state)) { state.pos++; }
+    state.parser.skipToken(state);
   }
 
   if (!found) {

lib/rules_inline/strikethrough.js

@@ -53,7 +53,7 @@ module.exports = function strikethrough(state, silent) {
       }
     }
 
-    if (!state.parser.skipToken(state)) { state.pos++; }
+    state.parser.skipToken(state);
   }
 
   if (!found) {