Added basic ol.parser.polyline module

This module will contain the low-level functions for Google's "Encoded
Polyline" algorithm.

test/spec/ol/parser/polyline.test.js

@@ -0,0 +1,41 @@
+goog.provide('ol.test.parser.polyline');
+
+describe('ol.parser.polyline', function() {
+
+  describe('encodeSignedInteger', function() {
+    it('returns expected value', function() {
+      var encodeSignedInteger = ol.parser.polyline.encodeSignedInteger;
+
+      expect(encodeSignedInteger(0)).toEqual('?');
+      expect(encodeSignedInteger(-1)).toEqual('@');
+      expect(encodeSignedInteger(1)).toEqual('A');
+      expect(encodeSignedInteger(-2)).toEqual('B');
+      expect(encodeSignedInteger(2)).toEqual('C');
+      expect(encodeSignedInteger(15)).toEqual(']');
+      expect(encodeSignedInteger(-16)).toEqual('^');
+
+      expect(encodeSignedInteger(16)).toEqual('_@');
+      expect(encodeSignedInteger(16 * 32)).toEqual('__@');
+      expect(encodeSignedInteger(16 * 32 * 32)).toEqual('___@');
+    });
+  });
+
+  describe('encodeUnsignedInteger', function() {
+    it('returns expected value', function() {
+      var encodeUnsignedInteger = ol.parser.polyline.encodeUnsignedInteger;
+
+      expect(encodeUnsignedInteger(0)).toEqual('?');
+      expect(encodeUnsignedInteger(1)).toEqual('@');
+      expect(encodeUnsignedInteger(2)).toEqual('A');
+      expect(encodeUnsignedInteger(30)).toEqual(']');
+      expect(encodeUnsignedInteger(31)).toEqual('^');
+      expect(encodeUnsignedInteger(32)).toEqual('_@');
+
+      expect(encodeUnsignedInteger(32 * 32)).toEqual('__@');
+      expect(encodeUnsignedInteger(5 * 32 * 32)).toEqual('__D');
+      expect(encodeUnsignedInteger(32 * 32 * 32)).toEqual('___@');
+    });
+  });
+});
+
+goog.require('ol.parser.polyline');