From 8f0dcbab804180828d6859b1340c86cf161209fb Mon Sep 17 00:00:00 2001
From: Misko Hevery
Date: Wed, 23 Mar 2011 09:33:29 -0700
Subject: feat(scope): new and improved scope implementation

- Speed improvements (about 4x on flush phase)
- Memory improvements (uses no function closures)
- Break $eval into $apply, $dispatch, $flush
- Introduced $watch and $observe

Breaks angular.equals() use === instead of ==
Breaks angular.scope() does not take parent as first argument
Breaks scope.$watch() takes scope as first argument
Breaks scope.$set(), scope.$get are removed
Breaks scope.$config is removed
Breaks $route.onChange callback has not "this" bounded
---
 src/parser.js | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)

(limited to 'src/parser.js')

diff --git a/src/parser.js b/src/parser.js
index 73733d48..76f9630e 100644
--- a/src/parser.js
+++ b/src/parser.js
@@ -659,5 +659,116 @@ function parser(text, json){
   }
 }
 
+//////////////////////////////////////////////////
+// Parser helper functions
+//////////////////////////////////////////////////
+
+function setter(obj, path, setValue) {
+  var element = path.split('.');
+  for (var i = 0; element.length > 1; i++) {
+    var key = element.shift();
+    var propertyObj = obj[key];
+    if (!propertyObj) {
+      propertyObj = {};
+      obj[key] = propertyObj;
+    }
+    obj = propertyObj;
+  }
+  obj[element.shift()] = setValue;
+  return setValue;
+}
+
+/**
+ * Return the value accesible from the object by path. Any undefined traversals are ignored
+ * @param {Object} obj starting object
+ * @param {string} path path to traverse
+ * @param {boolean=true} bindFnToScope
+ * @returns value as accesbile by path
+ */
+function getter(obj, path, bindFnToScope) {
+  if (!path) return obj;
+  var keys = path.split('.');
+  var key;
+  var lastInstance = obj;
+  var len = keys.length;
+
+  for (var i = 0; i < len; i++) {
+    key = keys[i];
+    if (obj) {
+      obj = (lastInstance = obj)[key];
+    }
+    if (isUndefined(obj)  && key.charAt(0) == '$') {
+      var type = angularGlobal.typeOf(lastInstance);
+      type = angular[type.charAt(0).toUpperCase()+type.substring(1)];
+      var fn = type ? type[[key.substring(1)]] : _undefined;
+      if (fn) {
+        return obj = bind(lastInstance, fn, lastInstance);
+      }
+    }
+  }
+  if (!bindFnToScope && isFunction(obj)) {
+    return bind(lastInstance, obj);
+  }
+  return obj;
+}
+
+var getterFnCache = {},
+    compileCache = {},
+    JS_KEYWORDS = {};
+
+forEach(
+    ("abstract,boolean,break,byte,case,catch,char,class,const,continue,debugger,default," +
+    "delete,do,double,else,enum,export,extends,false,final,finally,float,for,function,goto," +
+    "if,implements,import,ininstanceof,intinterface,long,native,new,null,package,private," +
+    "protected,public,return,short,static,super,switch,synchronized,this,throw,throws," +
+    "transient,true,try,typeof,var,volatile,void,undefined,while,with").split(/,/),
+  function(key){ JS_KEYWORDS[key] = true;}
+);
+
+function getterFn(path) {
+  var fn = getterFnCache[path];
+  if (fn) return fn;
+
+  var code = 'var l, fn, t;\n';
+  forEach(path.split('.'), function(key) {
+    key = (JS_KEYWORDS[key]) ? '["' + key + '"]' : '.' + key;
+    code += 'if(!s) return s;\n' +
+            'l=s;\n' +
+            's=s' + key + ';\n' +
+            'if(typeof s=="function" && !(s instanceof RegExp)) s = function(){ return l' +
+              key + '.apply(l, arguments); };\n';
+    if (key.charAt(1) == '$') {
+      // special code for super-imposed functions
+      var name = key.substr(2);
+      code += 'if(!s) {\n' +
+              ' t = angular.Global.typeOf(l);\n' +
+              ' fn = (angular[t.charAt(0).toUpperCase() + t.substring(1)]||{})["' + name + '"];\n' +
+              ' if (fn) s = function(){ return fn.apply(l, ' +
+                   '[l].concat(Array.prototype.slice.call(arguments, 0, arguments.length))); };\n' +
+              '}\n';
+    }
+  });
+  code += 'return s;';
+  fn = Function('s', code);
+  fn["toString"] = function(){ return code; };
+
+  return getterFnCache[path] = fn;
+}
 
+///////////////////////////////////
 
+// TODO(misko): Should this function be public?
+function compileExpr(expr) {
+  return parser(expr).statements();
+}
+
+// TODO(misko): Deprecate? Remove!
+// I think that compilation should be a service.
+function expressionCompile(exp) {
+  if (typeof exp === $function) return exp;
+  var fn = compileCache[exp];
+  if (!fn) {
+    fn = compileCache[exp] =  parser(exp).statements();
+  }
+  return fn;
+}
-- 
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