Getters for member expression properties

src/ol/expression/expressions.js

@@ -554,17 +554,17 @@ ol.expression.Math.prototype.getRight = function() {
  *
  * @constructor
  * @extends {ol.expression.Expression}
- * @param {ol.expression.Expression} expr An expression that resolves to an
+ * @param {ol.expression.Expression} object An expression that resolves to an
  *     object.
  * @param {ol.expression.Identifier} property Identifier with name of property.
  */
-ol.expression.Member = function(expr, property) {
+ol.expression.Member = function(object, property) {
 
   /**
    * @type {ol.expression.Expression}
    * @private
    */
-  this.expr_ = expr;
+  this.object_ = object;
 
   /**
    * @type {ol.expression.Identifier}
@@ -581,7 +581,7 @@ goog.inherits(ol.expression.Member, ol.expression.Expression);
  */
 ol.expression.Member.prototype.evaluate = function(opt_scope, opt_fns,
     opt_this) {
-  var obj = this.expr_.evaluate(opt_scope, opt_fns, opt_this);
+  var obj = this.object_.evaluate(opt_scope, opt_fns, opt_this);
   if (!goog.isObject(obj)) {
     throw new Error('Expected member expression to evaluate to an object ' +
         'but got ' + obj);
@@ -590,6 +590,24 @@ ol.expression.Member.prototype.evaluate = function(opt_scope, opt_fns,
 };
 
 
+/**
+ * Get the object expression.
+ * @return {ol.expression.Expression} The object.
+ */
+ol.expression.Member.prototype.getObject = function() {
+  return this.object_;
+};
+
+
+/**
+ * Get the property expression.
+ * @return {ol.expression.Identifier} The property.
+ */
+ol.expression.Member.prototype.getProperty = function() {
+  return this.property_;
+};
+
+
 
 /**
  * A logical not expression (e.g. `!foo`).

test/spec/ol/expression/expressions.test.js

@@ -558,6 +558,19 @@ describe('ol.expression.Member', function() {
       expect(expr.evaluate(scope)).to.be(42);
     });
   });
+
+  var object = new ol.expression.Identifier('foo');
+  var property = new ol.expression.Identifier('bar');
+  var expr = new ol.expression.Member(object, property);
+
+  describe('#getObject()', function() {
+    expect(expr.getObject()).to.be(object);
+  });
+
+  describe('#getProperty()', function() {
+    expect(expr.getProperty()).to.be(property);
+  });
+
 });