remove all the duplicate trim functionality, add trim() helper

Author: tj

index.js

@@ -168,7 +168,7 @@ module.exports = function(css, options){
   function selector() {
     var m = match(/^([^{]+)/);
     if (!m) return;
-    return m[0].replace(/^\s+|\s+$/g, '').split(/\s*,\s*/);
+    return trim(m[0]).split(/\s*,\s*/);
   }
 
   /**
@@ -181,7 +181,7 @@ module.exports = function(css, options){
     // prop
     var prop = match(/^(\*?[-\/\*\w]+)\s*/);
     if (!prop) return;
-    prop = prop[0].replace(/^\s+|\s+$/g, '');
+    prop = trim(prop[0]);
 
     // :
     if (!match(/^:\s*/)) return error("property missing ':'");
@@ -193,7 +193,7 @@ module.exports = function(css, options){
     var ret = pos({
       type: 'declaration',
       property: prop,
-      value: val[0].replace(/^\s+|\s+$/g, '')
+      value: trim(val[0])
     });
 
     // ;
@@ -290,7 +290,7 @@ module.exports = function(css, options){
     var m = match(/^@supports *([^{]+)/);
 
     if (!m) return;
-    var supports = m[1].replace(/^\s+|\s+$/g, '');
+    var supports = trim(m[1]);
 
     if (!open()) return error("@supports missing '{'");
 
@@ -314,7 +314,7 @@ module.exports = function(css, options){
     var m = match(/^@media *([^{]+)/);
 
     if (!m) return;
-    var media = m[1].replace(/^\s+|\s+$/g, '');
+    var media = trim(m[1]);
 
     if (!open()) return error("@media missing '{'");
 
@@ -368,8 +368,8 @@ module.exports = function(css, options){
     var m = match(/^@([-\w]+)?document *([^{]+)/);
     if (!m) return;
 
-    var vendor = (m[1] || '').replace(/^\s+|\s+$/g, '');
-    var doc = m[2].replace(/^\s+|\s+$/g, '');
+    var vendor = trim(m[1]);
+    var doc = trim(m[2]);
 
     if (!open()) return error("@document missing '{'");
 
@@ -418,7 +418,7 @@ module.exports = function(css, options){
     var m = match(new RegExp('^@' + name + ' *([^;\\n]+);'));
     if (!m) return;
     var ret = { type: name };
-    ret[name] = m[1].replace(/^\s+|\s+$/g, '');
+    ret[name] = trim(m[1]);
     return pos(ret);
   }
 
@@ -458,3 +458,10 @@ module.exports = function(css, options){
   return stylesheet();
 };
 
+/**
+ * Trim `str`.
+ */
+
+function trim(str) {
+  return (str || '').replace(/^\s+|\s+$/g, '');
+}