Initial parsing tests

src/ol/expression/parser.js

@@ -433,8 +433,7 @@ ol.expression.Parser.prototype.parseUnaryExpression_ = function(lexer) {
     expr = this.parseUnaryExpression_(lexer);
     expr = this.createUnaryExpression_('!', expr);
   } else {
-    // TODO: add token.index
-    throw new Error('Unexpected token: ' + operator.value);
+    expr = this.parseLeftHandSideExpression_(lexer);
   }
   return expr;
 };
@@ -450,3 +449,15 @@ ol.expression.Parser.prototype.parseUnaryExpression_ = function(lexer) {
 ol.expression.Parser.prototype.parseExpression_ = function(lexer) {
   return this.parseBinaryExpression_(lexer);
 };
+
+
+/**
+ * Parse an expression
+ * @param {string} source The expression source (e.g. `'foo + 2'`).
+ * @return {ol.expression.Expression} An expression instance that can be
+ *     evaluated within some scope to provide a value.
+ */
+ol.expression.parse = function(source) {
+  var parser = new ol.expression.Parser();
+  return parser.parse(source);
+};

test/spec/ol/expression/parser.test.js

@@ -0,0 +1,35 @@
+goog.provide('ol.test.expression');
+
+describe('ol.expression.Parser', function() {
+
+  describe('constructor', function() {
+    it('creates a new expression parser', function() {
+      var parser = new ol.expression.Parser();
+      expect(parser).to.be.a(ol.expression.Parser);
+    });
+  });
+
+  describe('#parseGroupExpression_()', function() {
+
+    function parse(source) {
+      var lexer = new ol.expression.Lexer(source);
+      var parser = new ol.expression.Parser();
+      return parser.parseGroupExpression_(lexer);
+    }
+
+    it('parses grouped expressions', function() {
+      var expr = parse('(3 * (foo + 2))');
+      expect(expr).to.be.a(ol.expression.Expression);
+      expect(expr).to.be.a(ol.expression.Math);
+      expect(expr.evaluate({foo: 3})).to.be(15);
+    });
+
+  });
+
+});
+
+
+goog.require('ol.expression.Expression');
+goog.require('ol.expression.Lexer');
+goog.require('ol.expression.Math');
+goog.require('ol.expression.Parser');