Partial fix for #10 , the lexer & parser can now handle curly brace, but target editor needs to be updated to support selecting multiple segment nodes

src/test/specs/gfunc-specs.js

@@ -60,7 +60,7 @@ define([
 
     it('should return function categories', function() {
       var catIndex = gfunc.getCategories();
-      expect(catIndex.Special.length).to.equal(7);
+      expect(catIndex.Special.length).to.equal(8);
     });
 
   });

src/test/specs/lexer-specs.js

@@ -21,6 +21,16 @@ define([
       expect(tokens[4].value).to.be('se1-server-*');
     });
 
+    it('should tokenize metric expression with curly braces', function() {
+      var lexer = new Lexer('metric.se1-{first, second}.count');
+      var tokens = lexer.tokenize();
+      expect(tokens.length).to.be(10);
+      expect(tokens[3].type).to.be('{');
+      expect(tokens[4].value).to.be('first');
+      expect(tokens[5].value).to.be(',');
+      expect(tokens[6].value).to.be('second');
+    });
+
 
     it('should tokenize functions and args', function() {
       var lexer = new Lexer("sum(metric.test, 12, 'test')");

src/test/specs/parser-specs.js

@@ -13,6 +13,24 @@ define([
       expect(rootNode.segments[0].value).to.be('metric');
     });
 
+    it('simple metric expression with curly braces', function() {
+      var parser = new Parser('metric.se1-{count, max}');
+      var rootNode = parser.getAst();
+
+      expect(rootNode.type).to.be('metric');
+      expect(rootNode.segments.length).to.be(2);
+      expect(rootNode.segments[1].value).to.be('se1-{count,max}');
+    });
+
+    it('simple metric expression with curly braces at start of segment and with post chars', function() {
+      var parser = new Parser('metric.{count, max}-something.count');
+      var rootNode = parser.getAst();
+
+      expect(rootNode.type).to.be('metric');
+      expect(rootNode.segments.length).to.be(3);
+      expect(rootNode.segments[1].value).to.be('{count,max}-something');
+    });
+
     it('simple function', function() {
       var parser = new Parser('sum(test)');
       var rootNode = parser.getAst();