Don't try to parse link title if link wasn't found

CHANGELOG.md

@@ -10,7 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - `[](<foo<bar>)` is no longer a valid link.
 - `[](url (xxx())` is no longer a valid link.
-- Fix performance issues when parsing links, #732.
+- Fix performance issues when parsing links, #732, #734.
 - Fix performance issues when parsing backticks, #733.
 
 

lib/rules_inline/link.js

@@ -15,9 +15,9 @@ module.exports = function link(state, silent) {
       pos,
       res,
       ref,
-      title,
       token,
       href = '',
+      title = '',
       oldPos = state.pos,
       max = state.posMax,
       start = state.pos,
@@ -60,31 +60,29 @@ module.exports = function link(state, silent) {
       } else {
         href = '';
       }
-    }
-
-    // [link](  <href>  "title"  )
-    //                ^^ skipping these spaces
-    start = pos;
-    for (; pos < max; pos++) {
-      code = state.src.charCodeAt(pos);
-      if (!isSpace(code) && code !== 0x0A) { break; }
-    }
-
-    // [link](  <href>  "title"  )
-    //                  ^^^^^^^ parsing link title
-    res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax);
-    if (pos < max && start !== pos && res.ok) {
-      title = res.str;
-      pos = res.pos;
 
       // [link](  <href>  "title"  )
-      //                         ^^ skipping these spaces
+      //                ^^ skipping these spaces
+      start = pos;
       for (; pos < max; pos++) {
         code = state.src.charCodeAt(pos);
         if (!isSpace(code) && code !== 0x0A) { break; }
       }
-    } else {
-      title = '';
+
+      // [link](  <href>  "title"  )
+      //                  ^^^^^^^ parsing link title
+      res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax);
+      if (pos < max && start !== pos && res.ok) {
+        title = res.str;
+        pos = res.pos;
+
+        // [link](  <href>  "title"  )
+        //                         ^^ skipping these spaces
+        for (; pos < max; pos++) {
+          code = state.src.charCodeAt(pos);
+          if (!isSpace(code) && code !== 0x0A) { break; }
+        }
+      }
     }
 
     if (pos >= max || state.src.charCodeAt(pos) !== 0x29/* ) */) {