From a51c8480efaf12d8071a5f5192770aa13cf3cc70 Mon Sep 17 00:00:00 2001
From: seven-phases-max <seven.phases.max@gmail.com>
Date: Sat, 4 Oct 2014 20:19:50 +0400
Subject: [PATCH] Fix interpolated selector match regression

---
 lib/less/tree/selector.js          | 46 +++++++++---------------------
 test/css/mixins-interpolated.css   |  4 +++
 test/less/mixins-interpolated.less |  6 ++++
 3 files changed, 24 insertions(+), 32 deletions(-)

diff --git a/lib/less/tree/selector.js b/lib/less/tree/selector.js
index e27e70f01..993d23709 100644
--- a/lib/less/tree/selector.js
+++ b/lib/less/tree/selector.js
@@ -50,41 +50,23 @@ Selector.prototype.match = function (other) {
 
     return olen; // return number of matched elements
 };
-Selector.prototype.CacheElements = function(){
-    var css = '', len, v, i;
+Selector.prototype.CacheElements = function() {
+    if (this._elements)
+        return;
+        
+    var elements = this.elements.map( function(v) {
+        return v.combinator.value + (v.value.value || v.value);
+    }).join("").match(/[,&#\*\.\w-]([\w-]|(\\.))*/g);
 
-    if( !this._elements ){
-
-        len = this.elements.length;
-        for(i = 0; i < len; i++){
-
-            v = this.elements[i];
-            css += v.combinator.value;
-
-            if( !v.value.value ){
-                css += v.value;
-                continue;
-            }
-
-            if( typeof v.value.value !== "string" ){
-                css = '';
-                break;
-            }
-            css += v.value.value;
+    if (elements) {
+        if (elements[0] === "&") {
+            elements.shift();
         }
-
-        this._elements = css.match(/[,&#\*\.\w-]([\w-]|(\\.))*/g);
-
-        if (this._elements) {
-            if (this._elements[0] === "&") {
-                this._elements.shift();
-            }
-
-        } else {
-            this._elements = [];
-        }
-
+    } else {
+        elements = [];
     }
+    
+    this._elements = elements;
 };
 Selector.prototype.isJustParentSelector = function() {
     return !this.mediaEmpty &&
diff --git a/test/css/mixins-interpolated.css b/test/css/mixins-interpolated.css
index 637b5b682..0d511fc67 100644
--- a/test/css/mixins-interpolated.css
+++ b/test/css/mixins-interpolated.css
@@ -1,3 +1,6 @@
+.123 {
+  a: 0;
+}
 .foo {
   a: 1;
 }
@@ -11,6 +14,7 @@
   a: 4;
 }
 mi-test-a {
+  a: 0;
   a: 1;
   a: 2;
   a: 3;
diff --git a/test/less/mixins-interpolated.less b/test/less/mixins-interpolated.less
index 2e75e9805..b79fa89a6 100644
--- a/test/less/mixins-interpolated.less
+++ b/test/less/mixins-interpolated.less
@@ -1,8 +1,13 @@
 
+@a0: 123;
 @a1: foo;
 @a2: ~".foo";
 @a4: ~"#foo";
 
+.@{a0} {
+    a: 0;
+}
+
 .@{a1} {
     a: 1;
 }
@@ -20,6 +25,7 @@
 }
 
 mi-test-a {
+    .123;
     .foo;
     #foo;
 }