From 2e33e89a77d115ff17f5841ec328b1c1e4228161 Mon Sep 17 00:00:00 2001
From: Misko Hevery
Date: Sun, 30 May 2010 19:42:21 -0700
Subject: added compiled getterFN for better performance

---
 scenario/perf.html |  2 +-
 src/Parser.js      |  7 +++----
 src/Scope.js       | 35 +++++++++++++++++++++++++++++++++++
 test/ScopeSpec.js  | 21 +++++++++++++++++++++
 4 files changed, 60 insertions(+), 5 deletions(-)

diff --git a/scenario/perf.html b/scenario/perf.html
index 1b0e40b4..e4edc00f 100644
--- a/scenario/perf.html
+++ b/scenario/perf.html
@@ -25,7 +25,7 @@
     <hr/>
     <ul>
       <li ng-repeat="item in items.$filter('').$orderBy('name')">
-        {{item.name}} {{item.parts.join(', ')}}
+        {{item.name}} <a href="#{{item.name}}">{{item.parts.join(', ')}}</a>
       </li>
     </ul>
   </body>
diff --git a/src/Parser.js b/src/Parser.js
index cfb72c72..df270792 100644
--- a/src/Parser.js
+++ b/src/Parser.js
@@ -151,9 +151,7 @@ Lexer.prototype = {
     }
     var fn = Lexer.OPERATORS[ident];
     if (!fn) {
-      fn = function(self){
-        return getter(self, ident);
-      };
+      fn = getterFn(ident);
       fn.isAssignable = ident;
     }
     this.tokens.push({index:start, text:ident, fn:fn});
@@ -563,8 +561,9 @@ Parser.prototype = {
 
   fieldAccess: function(object) {
     var field = this.expect().text;
+    var getter = getterFn(field);
     var fn = function (self){
-      return getter(object(self), field);
+      return getter(object(self));
     };
     fn.isAssignable = field;
     return fn;
diff --git a/src/Scope.js b/src/Scope.js
index bed0ff6d..1c223130 100644
--- a/src/Scope.js
+++ b/src/Scope.js
@@ -43,6 +43,41 @@ function setter(instance, path, value){
   return value;
 }
 
+///////////////////////////////////
+
+var getterFnCache = {};
+function getterFn(path){
+  var fn = getterFnCache[path];
+  if (fn) return fn;
+
+  var code = 'function (self){\n';
+  code += '  var last, fn, type;\n';
+  foreach(path.split('.'), function(key) {
+    code += '  if(!self) return self;\n';
+    code += '  last = self;\n';
+    code += '  self = self.' + key + ';\n';
+    code += '  if(typeof self == "function") \n';
+    code += '    self = function(){ return last.'+key+'.apply(last, arguments); };\n';
+    if (key.charAt(0) == '$') {
+      // special code for super-imposed functions
+      var name = key.substr(1);
+      code += '  if(!self) {\n';
+      code += '    type = angular.Global.typeOf(last);\n';
+      code += '    fn = (angular[type.charAt(0).toUpperCase() + type.substring(1)]||{})["' + name + '"];\n';
+      code += '    if (fn)\n';
+      code += '      self = function(){ return fn.apply(last, [last].concat(slice.call(arguments, 0, arguments.length))); };\n';
+      code += '  }\n';
+    }
+  });
+  code += '  return self;\n}';
+  fn = eval('(' + code + ')');
+  fn.toString = function(){ return code; };
+
+  return getterFnCache[path] = fn;
+}
+
+///////////////////////////////////
+
 var compileCache = {};
 function expressionCompile(exp){
   if (isFunction(exp)) return exp;
diff --git a/test/ScopeSpec.js b/test/ScopeSpec.js
index a3b6d9ae..d93400e5 100644
--- a/test/ScopeSpec.js
+++ b/test/ScopeSpec.js
@@ -157,4 +157,25 @@ describe('scope/model', function(){
       }
     });
   });
+
+  describe('getterFn', function(){
+    it('should get chain', function(){
+      expect(getterFn('a.b')(undefined)).toEqual(undefined);
+      expect(getterFn('a.b')({})).toEqual(undefined);
+      expect(getterFn('a.b')({a:null})).toEqual(undefined);
+      expect(getterFn('a.b')({a:{}})).toEqual(undefined);
+      expect(getterFn('a.b')({a:{b:null}})).toEqual(null);
+      expect(getterFn('a.b')({a:{b:0}})).toEqual(0);
+      expect(getterFn('a.b')({a:{b:'abc'}})).toEqual('abc');
+    });
+
+    it('should map type method on top of expression', function(){
+      expect(getterFn('a.$filter')({a:[]})('')).toEqual([]);
+    });
+
+    it('should bind function this', function(){
+      expect(getterFn('a')({a:function($){return this.b + $;}, b:1})(2)).toEqual(3);
+
+    });
+  });
 });
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