Fix custom tags by rolling back #643 & #664 (#670)

Pull requests #643 and #664 together fix the issue reported in issue #617, but the change in behavior is causing semvers concerns. See issue #669. Therefore, roll back #643 and #664 and later reintroduce in next planned major release (v3.0).

Fixes #669

mustache.js

@@ -444,11 +444,10 @@
    */
   Writer.prototype.parse = function parse (template, tags) {
     var cache = this.cache;
-    var cacheKey = template + ':' + (tags || mustache.tags).join(':');
-    var tokens = cache[cacheKey];
+    var tokens = cache[template];
 
     if (tokens == null)
-      tokens = cache[cacheKey] = parseTemplate(template, tags);
+      tokens = cache[template] = parseTemplate(template, tags);
 
     return tokens;
   };

test/parse-test.js

@@ -53,10 +53,6 @@ var expectations = {
                                             : [ [ '#', 'foo', 0, 8, [ [ '#', 'a', 11, 17, [ [ 'text', '    ', 18, 22 ], [ 'name', 'b', 22, 27 ], [ 'text', '\n', 27, 28 ] ], 30 ] ], 37 ] ]
 };
 
-beforeEach(function (){
-  Mustache.clearCache();
-});
-
 describe('Mustache.parse', function () {
 
   for (var template in expectations) {
@@ -107,47 +103,4 @@ describe('Mustache.parse', function () {
     });
   });
 
-  describe('when parsing a template without tags specified followed by the same template with tags specified', function() {
-    it('returns different tokens for the latter parse', function() {
-      var template = "{{foo}}[bar]";
-      var parsedWithBraces = Mustache.parse(template);
-      var parsedWithBrackets = Mustache.parse(template, ['[', ']']);
-      assert.notDeepEqual(parsedWithBrackets, parsedWithBraces);
-    });
-  });
-
-  describe('when parsing a template with tags specified followed by the same template with different tags specified', function() {
-    it('returns different tokens for the latter parse', function() {
-      var template = "(foo)[bar]";
-      var parsedWithParens = Mustache.parse(template, ['(', ')']);
-      var parsedWithBrackets = Mustache.parse(template, ['[', ']']);
-      assert.notDeepEqual(parsedWithBrackets, parsedWithParens);
-    });
-  });
-
-  describe('when parsing a template after already having parsed that template with a different Mustache.tags', function() {
-    it('returns different tokens for the latter parse', function() {
-      var template = "{{foo}}[bar]";
-      var parsedWithBraces = Mustache.parse(template);
-
-      var oldTags = Mustache.tags;
-      Mustache.tags = ['[', ']'];
-      var parsedWithBrackets = Mustache.parse(template);
-      Mustache.tags = oldTags;
-
-      assert.notDeepEqual(parsedWithBrackets, parsedWithBraces);
-    });
-  });
-
-  describe('when parsing a template with the same tags second time, return the cached tokens', function () {
-    it('returns the same tokens for the latter parse', function () {
-      var template = '{{foo}}[bar]';
-      var parsedResult1 = Mustache.parse(template);
-      var parsedResult2 = Mustache.parse(template);
-
-      assert.deepEqual(parsedResult1, parsedResult2);
-      assert.ok(parsedResult1 === parsedResult2);
-    });
-  });
-
 });