feat(core): introduce a CSS lexer/parser

modules/angular2/test/compiler/css/lexer_spec.ts

@@ -0,0 +1,386 @@
+import {
+  ddescribe,
+  describe,
+  it,
+  iit,
+  xit,
+  expect,
+  beforeEach,
+  afterEach
+} from 'angular2/testing_internal';
+
+import {isPresent} from "angular2/src/facade/lang";
+
+import {CssToken, CssLexer, CssLexerMode, CssTokenType} from 'angular2/src/compiler/css/lexer';
+
+export function main() {
+  function tokenize(code, trackComments: boolean = false,
+                    mode: CssLexerMode = CssLexerMode.ALL): CssToken[] {
+    var scanner = new CssLexer().scan(code, trackComments);
+    scanner.setMode(mode);
+
+    var tokens = [];
+    var output = scanner.scan();
+    while (output != null) {
+      if (isPresent(output.error)) {
+        throw output.error;
+      }
+      tokens.push(output.token);
+      output = scanner.scan();
+    }
+
+    return tokens;
+  }
+
+  describe('CssLexer', () => {
+    it('should lex newline characters as whitespace when whitespace mode is on', () => {
+      var newlines = ["\n", "\r\n", "\r", "\f"];
+      newlines.forEach((line) => {
+        var token = tokenize(line, false, CssLexerMode.ALL_TRACK_WS)[0];
+        expect(token.type).toEqual(CssTokenType.Whitespace);
+      });
+    });
+
+    it('should combined newline characters as one newline token when whitespace mode is on', () => {
+      var newlines = ["\n", "\r\n", "\r", "\f"].join("");
+      var tokens = tokenize(newlines, false, CssLexerMode.ALL_TRACK_WS);
+      expect(tokens.length).toEqual(1);
+      expect(tokens[0].type).toEqual(CssTokenType.Whitespace);
+    });
+
+    it('should not consider whitespace or newline values at all when whitespace mode is off',
+       () => {
+         var newlines = ["\n", "\r\n", "\r", "\f"].join("");
+         var tokens = tokenize(newlines);
+         expect(tokens.length).toEqual(0);
+       });
+
+    it('should lex simple selectors and their inner properties', () => {
+      var cssCode = "\n" + "  .selector { my-prop: my-value; }\n";
+      var tokens = tokenize(cssCode);
+
+      expect(tokens[0].type).toEqual(CssTokenType.Character);
+      expect(tokens[0].strValue).toEqual('.');
+
+      expect(tokens[1].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[1].strValue).toEqual('selector');
+
+      expect(tokens[2].type).toEqual(CssTokenType.Character);
+      expect(tokens[2].strValue).toEqual('{');
+
+      expect(tokens[3].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[3].strValue).toEqual('my-prop');
+
+      expect(tokens[4].type).toEqual(CssTokenType.Character);
+      expect(tokens[4].strValue).toEqual(':');
+
+      expect(tokens[5].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[5].strValue).toEqual('my-value');
+
+      expect(tokens[6].type).toEqual(CssTokenType.Character);
+      expect(tokens[6].strValue).toEqual(';');
+
+      expect(tokens[7].type).toEqual(CssTokenType.Character);
+      expect(tokens[7].strValue).toEqual('}');
+    });
+
+    it('should capture the column and line values for each token', () => {
+      var cssCode = "#id {\n" + "  prop:value;\n" + "}";
+
+      var tokens = tokenize(cssCode);
+
+      // #
+      expect(tokens[0].type).toEqual(CssTokenType.Character);
+      expect(tokens[0].column).toEqual(0);
+      expect(tokens[0].line).toEqual(0);
+
+      // id
+      expect(tokens[1].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[1].column).toEqual(1);
+      expect(tokens[1].line).toEqual(0);
+
+      // {
+      expect(tokens[2].type).toEqual(CssTokenType.Character);
+      expect(tokens[2].column).toEqual(4);
+      expect(tokens[2].line).toEqual(0);
+
+      // prop
+      expect(tokens[3].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[3].column).toEqual(2);
+      expect(tokens[3].line).toEqual(1);
+
+      // :
+      expect(tokens[4].type).toEqual(CssTokenType.Character);
+      expect(tokens[4].column).toEqual(6);
+      expect(tokens[4].line).toEqual(1);
+
+      // value
+      expect(tokens[5].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[5].column).toEqual(7);
+      expect(tokens[5].line).toEqual(1);
+
+      // ;
+      expect(tokens[6].type).toEqual(CssTokenType.Character);
+      expect(tokens[6].column).toEqual(12);
+      expect(tokens[6].line).toEqual(1);
+
+      // }
+      expect(tokens[7].type).toEqual(CssTokenType.Character);
+      expect(tokens[7].column).toEqual(0);
+      expect(tokens[7].line).toEqual(2);
+    });
+
+    it('should lex quoted strings and escape accordingly', () => {
+      var cssCode = "prop: 'some { value } \\' that is quoted'";
+      var tokens = tokenize(cssCode);
+
+      expect(tokens[0].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[1].type).toEqual(CssTokenType.Character);
+      expect(tokens[2].type).toEqual(CssTokenType.String);
+      expect(tokens[2].strValue).toEqual("'some { value } \\' that is quoted'");
+    });
+
+    it('should treat attribute operators as regular characters', () => {
+      tokenize('^|~+*').forEach((token) => { expect(token.type).toEqual(CssTokenType.Character); });
+    });
+
+    it('should lex numbers properly and set them as numbers', () => {
+      var cssCode = "0 1 -2 3.0 -4.001";
+      var tokens = tokenize(cssCode);
+
+      expect(tokens[0].type).toEqual(CssTokenType.Number);
+      expect(tokens[0].strValue).toEqual("0");
+
+      expect(tokens[1].type).toEqual(CssTokenType.Number);
+      expect(tokens[1].strValue).toEqual("1");
+
+      expect(tokens[2].type).toEqual(CssTokenType.Number);
+      expect(tokens[2].strValue).toEqual("-2");
+
+      expect(tokens[3].type).toEqual(CssTokenType.Number);
+      expect(tokens[3].strValue).toEqual("3.0");
+
+      expect(tokens[4].type).toEqual(CssTokenType.Number);
+      expect(tokens[4].strValue).toEqual("-4.001");
+    });
+
+    it('should lex @keywords', () => {
+      var cssCode = "@import()@something";
+      var tokens = tokenize(cssCode);
+
+      expect(tokens[0].type).toEqual(CssTokenType.AtKeyword);
+      expect(tokens[0].strValue).toEqual('@import');
+
+      expect(tokens[1].type).toEqual(CssTokenType.Character);
+      expect(tokens[1].strValue).toEqual('(');
+
+      expect(tokens[2].type).toEqual(CssTokenType.Character);
+      expect(tokens[2].strValue).toEqual(')');
+
+      expect(tokens[3].type).toEqual(CssTokenType.AtKeyword);
+      expect(tokens[3].strValue).toEqual('@something');
+    });
+
+    it('should still lex a number even if it has a dimension suffix', () => {
+      var cssCode = "40% is 40 percent";
+      var tokens = tokenize(cssCode);
+
+      expect(tokens[0].type).toEqual(CssTokenType.Number);
+      expect(tokens[0].strValue).toEqual('40');
+
+      expect(tokens[1].type).toEqual(CssTokenType.Character);
+      expect(tokens[1].strValue).toEqual('%');
+
+      expect(tokens[2].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[2].strValue).toEqual('is');
+
+      expect(tokens[3].type).toEqual(CssTokenType.Number);
+      expect(tokens[3].strValue).toEqual('40');
+    });
+
+    it('should allow escaped character and unicode character-strings in CSS selectors', () => {
+      var cssCode = "\\123456 .some\\thing \{\}";
+      var tokens = tokenize(cssCode);
+
+      expect(tokens[0].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[0].strValue).toEqual('\\123456');
+
+      expect(tokens[1].type).toEqual(CssTokenType.Character);
+      expect(tokens[2].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[2].strValue).toEqual('some\\thing');
+    });
+
+    it('should distinguish identifiers and numbers from special characters', () => {
+      var cssCode = "one*two=-4+three-4-equals_value$";
+      var tokens = tokenize(cssCode);
+
+      expect(tokens[0].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[0].strValue).toEqual("one");
+
+      expect(tokens[1].type).toEqual(CssTokenType.Character);
+      expect(tokens[1].strValue).toEqual("*");
+
+      expect(tokens[2].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[2].strValue).toEqual("two");
+
+      expect(tokens[3].type).toEqual(CssTokenType.Character);
+      expect(tokens[3].strValue).toEqual("=");
+
+      expect(tokens[4].type).toEqual(CssTokenType.Number);
+      expect(tokens[4].strValue).toEqual("-4");
+
+      expect(tokens[5].type).toEqual(CssTokenType.Character);
+      expect(tokens[5].strValue).toEqual("+");
+
+      expect(tokens[6].type).toEqual(CssTokenType.Identifier);
+      expect(tokens[6].strValue).toEqual("three-4-equals_value");
+
+      expect(tokens[7].type).toEqual(CssTokenType.Character);
+      expect(tokens[7].strValue).toEqual("$");
+    });
+
+    it('should filter out comments and whitespace by default', () => {
+      var cssCode = ".selector /* comment */ { /* value */ }";
+      var tokens = tokenize(cssCode);
+
+      expect(tokens[0].strValue).toEqual(".");
+      expect(tokens[1].strValue).toEqual("selector");
+      expect(tokens[2].strValue).toEqual("{");
+      expect(tokens[3].strValue).toEqual("}");
+    });
+
+    it('should track comments when the flag is set to true', () => {
+      var cssCode = ".selector /* comment */ { /* value */ }";
+      var trackComments = true;
+      var tokens = tokenize(cssCode, trackComments, CssLexerMode.ALL_TRACK_WS);
+
+      expect(tokens[0].strValue).toEqual(".");
+      expect(tokens[1].strValue).toEqual("selector");
+      expect(tokens[2].strValue).toEqual(" ");
+
+      expect(tokens[3].type).toEqual(CssTokenType.Comment);
+      expect(tokens[3].strValue).toEqual("/* comment */");
+
+      expect(tokens[4].strValue).toEqual(" ");
+      expect(tokens[5].strValue).toEqual("{");
+      expect(tokens[6].strValue).toEqual(" ");
+
+      expect(tokens[7].type).toEqual(CssTokenType.Comment);
+      expect(tokens[7].strValue).toEqual("/* value */");
+    });
+
+    describe('Selector Mode', () => {
+      it('should throw an error if a selector is being parsed while in the wrong mode', () => {
+        var cssCode = ".class > tag";
+
+        var capturedMessage;
+        try {
+          tokenize(cssCode, false, CssLexerMode.STYLE_BLOCK);
+        } catch (e) {
+          capturedMessage = e.message;
+        }
+
+        expect(capturedMessage).toMatch(/Unexpected character \[>\] at column 0:7 in expression/g);
+
+        capturedMessage = null;
+        var capturedMessage;
+        try {
+          tokenize(cssCode, false, CssLexerMode.SELECTOR);
+        } catch (e) {
+          capturedMessage = e.message;
+        }
+
+        expect(capturedMessage).toEqual(null);
+      });
+    });
+
+    describe('Attribute Mode', () => {
+      it('should consider attribute selectors as valid input and throw when an invalid modifier is used',
+         () => {
+           function tokenizeAttr(modifier) {
+             var cssCode = "value" + modifier + "='something'";
+             return tokenize(cssCode, false, CssLexerMode.ATTRIBUTE_SELECTOR);
+           }
+
+           expect(tokenizeAttr("*").length).toEqual(4);
+           expect(tokenizeAttr("|").length).toEqual(4);
+           expect(tokenizeAttr("^").length).toEqual(4);
+           expect(tokenizeAttr("$").length).toEqual(4);
+           expect(tokenizeAttr("~").length).toEqual(4);
+           expect(tokenizeAttr("").length).toEqual(3);
+
+           expect(() => { tokenizeAttr("+"); }).toThrow();
+         });
+    });
+
+    describe('Media Query Mode', () => {
+      it('should validate media queries with a reduced subset of valid characters', () => {
+        function tokenizeQuery(code) { return tokenize(code, false, CssLexerMode.MEDIA_QUERY); }
+
+        // the reason why the numbers are so high is because MediaQueries keep
+        // track of the whitespace values
+        expect(tokenizeQuery("(prop: value)").length).toEqual(5);
+        expect(tokenizeQuery("(prop: value) and (prop2: value2)").length).toEqual(11);
+        expect(tokenizeQuery("tv and (prop: value)").length).toEqual(7);
+        expect(tokenizeQuery("print and ((prop: value) or (prop2: value2))").length).toEqual(15);
+        expect(tokenizeQuery("(content: 'something $ crazy inside &')").length).toEqual(5);
+
+        expect(() => { tokenizeQuery("(max-height: 10 + 20)"); }).toThrow();
+
+        expect(() => { tokenizeQuery("(max-height: fifty < 100)"); }).toThrow();
+      });
+    });
+
+    describe('Pseudo Selector Mode', () => {
+      it('should validate pseudo selector identifiers with a reduced subset of valid characters',
+         () => {
+           function tokenizePseudo(code) {
+             return tokenize(code, false, CssLexerMode.PSEUDO_SELECTOR);
+           }
+
+           expect(tokenizePseudo("lang(en-us)").length).toEqual(4);
+           expect(tokenizePseudo("hover").length).toEqual(1);
+           expect(tokenizePseudo("focus").length).toEqual(1);
+
+           expect(() => { tokenizePseudo("lang(something:broken)"); }).toThrow();
+
+           expect(() => { tokenizePseudo("not(.selector)"); }).toThrow();
+         });
+    });
+
+    describe('Pseudo Selector Mode', () => {
+      it('should validate pseudo selector identifiers with a reduced subset of valid characters',
+         () => {
+           function tokenizePseudo(code) {
+             return tokenize(code, false, CssLexerMode.PSEUDO_SELECTOR);
+           }
+
+           expect(tokenizePseudo("lang(en-us)").length).toEqual(4);
+           expect(tokenizePseudo("hover").length).toEqual(1);
+           expect(tokenizePseudo("focus").length).toEqual(1);
+
+           expect(() => { tokenizePseudo("lang(something:broken)"); }).toThrow();
+
+           expect(() => { tokenizePseudo("not(.selector)"); }).toThrow();
+         });
+    });
+
+    describe('Style Block Mode', () => {
+      it('should style blocks with a reduced subset of valid characters', () => {
+        function tokenizeStyles(code) { return tokenize(code, false, CssLexerMode.STYLE_BLOCK); }
+
+        expect(tokenizeStyles(`
+          key: value;
+          prop: 100;
+          style: value3!important;
+        `).length)
+            .toEqual(14);
+
+        expect(() => tokenizeStyles(` key$: value; `)).toThrow();
+        expect(() => tokenizeStyles(` key: value$; `)).toThrow();
+        expect(() => tokenizeStyles(` key: value + 10; `)).toThrow();
+        expect(() => tokenizeStyles(` key: &value; `)).toThrow();
+      });
+    });
+  });
+}

modules/angular2/test/compiler/css/parser_spec.ts

@@ -0,0 +1,635 @@
+import {
+  ddescribe,
+  describe,
+  it,
+  iit,
+  xit,
+  expect,
+  beforeEach,
+  afterEach
+} from 'angular2/testing_internal';
+
+import {BaseException} from 'angular2/src/facade/exceptions';
+
+import {
+  ParsedCssResult,
+  CssParser,
+  BlockType,
+  CssSelectorRuleAST,
+  CssKeyframeRuleAST,
+  CssKeyframeDefinitionAST,
+  CssBlockDefinitionRuleAST,
+  CssMediaQueryRuleAST,
+  CssBlockRuleAST,
+  CssInlineRuleAST,
+  CssStyleValueAST,
+  CssSelectorAST,
+  CssDefinitionAST,
+  CssStyleSheetAST,
+  CssRuleAST,
+  CssBlockAST,
+  CssParseError
+} from 'angular2/src/compiler/css/parser';
+
+import {CssLexer} from 'angular2/src/compiler/css/lexer';
+
+export function assertTokens(tokens, valuesArr) {
+  for (var i = 0; i < tokens.length; i++) {
+    expect(tokens[i].strValue == valuesArr[i]);
+  }
+}
+
+export function main() {
+  describe('CssParser', () => {
+    function parse(css): ParsedCssResult {
+      var lexer = new CssLexer();
+      var scanner = lexer.scan(css);
+      var parser = new CssParser(scanner, 'some-fake-file-name.css');
+      return parser.parse();
+    }
+
+    function makeAST(css): CssStyleSheetAST {
+      var output = parse(css);
+      var errors = output.errors;
+      if (errors.length > 0) {
+        throw new BaseException(errors.map((error: CssParseError) => error.msg).join(', '));
+      }
+      return output.ast;
+    }
+
+    it('should parse CSS into a stylesheet AST', () => {
+      var styles = `
+        .selector {
+          prop: value123;
+        }
+      `;
+
+      var ast = makeAST(styles);
+      expect(ast.rules.length).toEqual(1);
+
+      var rule = <CssSelectorRuleAST>ast.rules[0];
+      var selector = rule.selectors[0];
+      expect(selector.strValue).toEqual('.selector');
+
+      var block: CssBlockAST = rule.block;
+      expect(block.entries.length).toEqual(1);
+
+      var definition = <CssDefinitionAST>block.entries[0];
+      expect(definition.property.strValue).toEqual('prop');
+
+      var value = <CssStyleValueAST>definition.value;
+      expect(value.tokens[0].strValue).toEqual('value123');
+    });
+
+    it('should parse mutliple CSS selectors sharing the same set of styles', () => {
+      var styles = `
+        .class, #id, tag, [attr], key + value, * value, :-moz-any-link {
+          prop: value123;
+        }
+      `;
+
+      var ast = makeAST(styles);
+      expect(ast.rules.length).toEqual(1);
+
+      var rule = <CssSelectorRuleAST>ast.rules[0];
+      expect(rule.selectors.length).toBe(7);
+
+      assertTokens(rule.selectors[0].tokens, [".", "class"]);
+      assertTokens(rule.selectors[1].tokens, ["#", "id"]);
+      assertTokens(rule.selectors[2].tokens, ["tag"]);
+      assertTokens(rule.selectors[3].tokens, ["[", "attr", "]"]);
+      assertTokens(rule.selectors[4].tokens, ["key", "+", "value"]);
+      assertTokens(rule.selectors[5].tokens, ["*", "value"]);
+      assertTokens(rule.selectors[6].tokens, [":", "-moz-any-link"]);
+
+      var style1 = <CssDefinitionAST>rule.block.entries[0];
+      expect(style1.property.strValue).toBe("prop");
+      assertTokens(style1.value.tokens, ["value123"]);
+    });
+
+    it('should parse keyframe rules', () => {
+      var styles = `
+        @keyframes rotateMe {
+          from {
+            transform: rotate(-360deg);
+          }
+          50% {
+            transform: rotate(0deg);
+          }
+          to {
+            transform: rotate(360deg);
+          }
+        }
+      `;
+
+      var ast = makeAST(styles);
+      expect(ast.rules.length).toEqual(1);
+
+      var rule = <CssKeyframeRuleAST>ast.rules[0];
+      expect(rule.name.strValue).toEqual('rotateMe');
+
+      var block = <CssBlockAST>rule.block;
+      var fromRule = <CssKeyframeDefinitionAST>block.entries[0];
+
+      expect(fromRule.name.strValue).toEqual('from');
+      var fromStyle = <CssDefinitionAST>(<CssBlockAST>fromRule.block).entries[0];
+      expect(fromStyle.property.strValue).toEqual('transform');
+      assertTokens(fromStyle.value.tokens, ['rotate', '(', '-360', 'deg', ')']);
+
+      var midRule = <CssKeyframeDefinitionAST>block.entries[1];
+
+      expect(midRule.name.strValue).toEqual('50%');
+      var midStyle = <CssDefinitionAST>(<CssBlockAST>midRule.block).entries[0];
+      expect(midStyle.property.strValue).toEqual('transform');
+      assertTokens(midStyle.value.tokens, ['rotate', '(', '0', 'deg', ')']);
+
+      var toRule = <CssKeyframeDefinitionAST>block.entries[2];
+
+      expect(toRule.name.strValue).toEqual('to');
+      var toStyle = <CssDefinitionAST>(<CssBlockAST>toRule.block).entries[0];
+      expect(toStyle.property.strValue).toEqual('transform');
+      assertTokens(toStyle.value.tokens, ['rotate', '(', '360', 'deg', ')']);
+    });
+
+    it('should parse media queries into a stylesheet AST', () => {
+      var styles = `
+        @media all and (max-width:100px) {
+          .selector {
+            prop: value123;
+          }
+        }
+      `;
+
+      var ast = makeAST(styles);
+      expect(ast.rules.length).toEqual(1);
+
+      var rule = <CssMediaQueryRuleAST>ast.rules[0];
+      assertTokens(rule.query, ['all', 'and', '(', 'max-width', ':', '100px', ')']);
+
+      var block = <CssBlockAST>rule.block;
+      expect(block.entries.length).toEqual(1);
+
+      var rule2 = <CssSelectorRuleAST>block.entries[0];
+      expect(rule2.selectors[0].strValue).toEqual('.selector');
+
+      var block2 = <CssBlockAST>rule2.block;
+      expect(block2.entries.length).toEqual(1);
+    });
+
+    it('should parse inline CSS values', () => {
+      var styles = `
+        @import url('remote.css');
+        @charset "UTF-8";
+        @namespace ng url(http://angular.io/namespace/ng);
+      `;
+
+      var ast = makeAST(styles);
+
+      var importRule = <CssInlineRuleAST>ast.rules[0];
+      expect(importRule.type).toEqual(BlockType.Import);
+      assertTokens(importRule.value.tokens, ["url", "(", "remote", ".", "css", ")"]);
+
+      var charsetRule = <CssInlineRuleAST>ast.rules[1];
+      expect(charsetRule.type).toEqual(BlockType.Charset);
+      assertTokens(importRule.value.tokens, ["UTF-8"]);
+
+      var namespaceRule = <CssInlineRuleAST>ast.rules[2];
+      expect(namespaceRule.type).toEqual(BlockType.Namespace);
+      assertTokens(namespaceRule.value.tokens,
+                    ["ng", "url", "(", "http://angular.io/namespace/ng", ")"]);
+    });
+
+    it('should parse CSS values that contain functions and leave the inner function data untokenized', () => {
+      var styles = `
+        .class {
+          background: url(matias.css);
+          animation-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
+          height: calc(100% - 50px);
+        }
+      `;
+
+      var ast = makeAST(styles);
+      expect(ast.rules.length).toEqual(1);
+
+      var defs = (<CssSelectorRuleAST>ast.rules[0]).block.entries;
+      expect(defs.length).toEqual(3);
+
+      assertTokens((<CssDefinitionAST>defs[0]).value, ['url','(','matias.css',')']);
+      assertTokens((<CssDefinitionAST>defs[1]).value, ['cubic-bezier','(','0.755, 0.050, 0.855, 0.060',')']);
+      assertTokens((<CssDefinitionAST>defs[2]).value, ['calc','(','100% - 50px',')']);
+    });
+
+    it('should parse un-named block-level CSS values', () => {
+      var styles = `
+        @font-face {
+          font-family: "Matias";
+          font-weight: bold;
+          src: url(font-face.ttf);
+        }
+        @viewport {
+          max-width: 100px;
+          min-height: 1000px;
+        }
+      `;
+
+      var ast = makeAST(styles);
+
+      var fontFaceRule = <CssBlockRuleAST>ast.rules[0];
+      expect(fontFaceRule.type).toEqual(BlockType.FontFace);
+      expect(fontFaceRule.block.entries.length).toEqual(3);
+
+      var viewportRule = <CssBlockRuleAST>ast.rules[1];
+      expect(viewportRule.type).toEqual(BlockType.Viewport);
+      expect(viewportRule.block.entries.length).toEqual(2);
+    });
+
+    it('should parse multiple levels of semicolons', () => {
+      var styles = `
+        ;;;
+        @import url('something something')
+        ;;;;;;;;
+        ;;;;;;;;
+        ;@font-face {
+          ;src   :   url(font-face.ttf);;;;;;;;
+          ;;;-webkit-animation:my-animation
+        };;;
+        @media all and (max-width:100px)
+        {;
+          .selector {prop: value123;};
+          ;.selector2{prop:1}}
+      `;
+
+      var ast = makeAST(styles);
+
+      var importRule = <CssInlineRuleAST>ast.rules[0];
+      expect(importRule.type).toEqual(BlockType.Import);
+      assertTokens(importRule.value.tokens, ["url", "(", "something something", ")"]);
+
+      var fontFaceRule = <CssBlockRuleAST>ast.rules[1];
+      expect(fontFaceRule.type).toEqual(BlockType.FontFace);
+      expect(fontFaceRule.block.entries.length).toEqual(2);
+
+      var mediaQueryRule = <CssMediaQueryRuleAST>ast.rules[2];
+      assertTokens(mediaQueryRule.query, ['all', 'and', '(', 'max-width', ':', '100px', ')']);
+      expect(mediaQueryRule.block.entries.length).toEqual(2);
+    });
+
+    it('should throw an error if an unknown @value block rule is parsed', () => {
+      var styles = `
+        @matias { hello: there; }
+      `;
+
+      expect(() => {
+        makeAST(styles);
+      }).toThrowError(/^CSS Parse Error: The CSS "at" rule "@matias" is not allowed to used here/);
+    });
+
+    it('should parse empty rules', () => {
+      var styles = `
+        .empty-rule { }
+        .somewhat-empty-rule { /* property: value; */ }
+        .non-empty-rule { property: value; }
+      `;
+
+      var ast = makeAST(styles);
+
+      var rules = ast.rules;
+      expect((<CssSelectorRuleAST>rules[0]).block.entries.length).toEqual(0);
+      expect((<CssSelectorRuleAST>rules[1]).block.entries.length).toEqual(0);
+      expect((<CssSelectorRuleAST>rules[2]).block.entries.length).toEqual(1);
+    });
+
+    it('should parse the @document rule', () => {
+      var styles = `
+        @document url(http://www.w3.org/),
+                       url-prefix(http://www.w3.org/Style/),
+                       domain(mozilla.org),
+                       regexp("https:.*")
+        {
+          /* CSS rules here apply to:
+             - The page "http://www.w3.org/".
+             - Any page whose URL begins with "http://www.w3.org/Style/"
+             - Any page whose URL's host is "mozilla.org" or ends with
+               ".mozilla.org"
+             - Any page whose URL starts with "https:" */
+
+          /* make the above-mentioned pages really ugly */
+          body {
+            color: purple;
+            background: yellow;
+          }
+        }
+      `;
+
+      var ast = makeAST(styles);
+
+      var rules = ast.rules;
+      var documentRule = <CssBlockDefinitionRuleAST>rules[0];
+      expect(documentRule.type).toEqual(BlockType.Document);
+
+      var rule = <CssSelectorRuleAST>documentRule.block.entries[0];
+      expect(rule.strValue).toEqual("body");
+    });
+
+    it('should parse the @page rule', () => {
+      var styles = `
+        @page one {
+          .selector { prop: value; }
+        }
+        @page two {
+          .selector2 { prop: value2; }
+        }
+      `;
+
+      var ast = makeAST(styles);
+
+      var rules = ast.rules;
+
+      var pageRule1 = <CssBlockDefinitionRuleAST>rules[0];
+      expect(pageRule1.strValue).toEqual("one");
+      expect(pageRule1.type).toEqual(BlockType.Page);
+
+      var pageRule2 = <CssBlockDefinitionRuleAST>rules[1];
+      expect(pageRule2.strValue).toEqual("two");
+      expect(pageRule2.type).toEqual(BlockType.Page);
+
+      var selectorOne = <CssSelectorRuleAST>pageRule1.block.entries[0];
+      expect(selectorOne.strValue).toEqual('.selector');
+
+      var selectorTwo = <CssSelectorRuleAST>pageRule2.block.entries[0];
+      expect(selectorTwo.strValue).toEqual('.selector2');
+    });
+
+    it('should parse the @supports rule', () => {
+      var styles = `
+        @supports (animation-name: "rotate") {
+          a:hover { animation: rotate 1s; }
+        }
+      `;
+
+      var ast = makeAST(styles);
+
+      var rules = ast.rules;
+
+      var supportsRule = <CssBlockDefinitionRuleAST>rules[0];
+      assertTokens(supportsRule.query, ['(', 'animation-name', ':', 'rotate', ')']);
+      expect(supportsRule.type).toEqual(BlockType.Supports);
+
+      var selectorOne = <CssSelectorRuleAST>supportsRule.block.entries[0];
+      expect(selectorOne.strValue).toEqual('a:hover');
+    });
+
+    it('should collect multiple errors during parsing', () => {
+      var styles = `
+        .class$value { something: something }
+        @custom { something: something }
+        #id { cool^: value }
+      `;
+
+      var output = parse(styles);
+      expect(output.errors.length).toEqual(3);
+    });
+
+    it('should recover from selector errors and continue parsing', () => {
+      var styles = `
+        tag& { key: value; }
+        .%tag { key: value; }
+        #tag$ { key: value; }
+      `;
+
+      var output = parse(styles);
+      var errors = output.errors;
+      var ast = output.ast;
+
+      expect(errors.length).toEqual(3);
+
+      expect(ast.rules.length).toEqual(3);
+
+      var rule1 = <CssSelectorRuleAST>ast.rules[0];
+      expect(rule1.selectors[0].strValue).toEqual("tag&");
+      expect(rule1.block.entries.length).toEqual(1);
+
+      var rule2 = <CssSelectorRuleAST>ast.rules[1];
+      expect(rule2.selectors[0].strValue).toEqual(".%tag");
+      expect(rule2.block.entries.length).toEqual(1);
+
+      var rule3 = <CssSelectorRuleAST>ast.rules[2];
+      expect(rule3.selectors[0].strValue).toEqual("#tag$");
+      expect(rule3.block.entries.length).toEqual(1);
+    });
+
+    it('should throw an error when parsing invalid CSS Selectors', () => {
+      var styles = '.class[[prop%=value}] { style: val; }';
+      var output = parse(styles);
+      var errors = output.errors;
+
+      expect(errors.length).toEqual(3);
+
+      expect(errors[0].msg).toMatch(/Unexpected character \[\[\] at column 0:7/g);
+
+      expect(errors[1].msg).toMatch(/Unexpected character \[%\] at column 0:12/g);
+
+      expect(errors[2].msg).toMatch(/Unexpected character \[}\] at column 0:19/g);
+    });
+
+    it('should throw an error if an attribute selector is not closed properly', () => {
+      var styles = '.class[prop=value { style: val; }';
+      var output = parse(styles);
+      var errors = output.errors;
+
+      expect(errors[0].msg).toMatch(/Unbalanced CSS attribute selector at column 0:12/g);
+    });
+
+    it('should throw an error if a pseudo function selector is not closed properly', () => {
+      var styles = 'body:lang(en { key:value; }';
+      var output = parse(styles);
+      var errors = output.errors;
+
+      expect(errors[0].msg).toMatch(/Unbalanced pseudo selector function value at column 0:10/g);
+    });
+
+    it('should raise an error when a semi colon is missing from a CSS style/pair that isn\'t the last entry', () => {
+      var styles = `.class {
+        color: red
+        background: blue
+      }`;
+
+      var output = parse(styles);
+      var errors = output.errors;
+
+      expect(errors.length).toEqual(1);
+
+      expect(errors[0].msg)
+        .toMatch(/The CSS key\/value definition did not end with a semicolon at column 1:15/g);
+    });
+
+    it('should parse the inner value of a :not() pseudo-selector as a CSS selector', () => {
+      var styles = `div:not(.ignore-this-div) {
+        prop: value;
+      }`;
+
+      var output = parse(styles);
+      var errors = output.errors;
+      var ast = output.ast;
+
+      expect(errors.length).toEqual(0);
+
+      var rule1 = <CssSelectorRuleAST>ast.rules[0];
+      expect(rule1.selectors.length).toEqual(1);
+
+      var selector = rule1.selectors[0];
+      assertTokens(selector.tokens, ['div',':','not','(','.','ignore-this-div',')']);
+    });
+
+    it('should raise parse errors when CSS key/value pairs are invalid', () => {
+      var styles = `.class {
+        background color: value;
+        color: value
+        font-size;
+        font-weight
+      }`;
+
+      var output = parse(styles);
+      var errors = output.errors;
+
+      expect(errors.length).toEqual(4);
+
+      expect(errors[0].msg)
+          .toMatch(
+              /Identifier does not match expected Character value \("color" should match ":"\) at column 1:19/g);
+
+      expect(errors[1].msg)
+          .toMatch(/The CSS key\/value definition did not end with a semicolon at column 2:15/g);
+
+      expect(errors[2].msg)
+          .toMatch(/The CSS property was not paired with a style value at column 3:8/g);
+
+      expect(errors[3].msg)
+          .toMatch(/The CSS property was not paired with a style value at column 4:8/g);
+    });
+
+    it('should recover from CSS key/value parse errors', () => {
+      var styles = `
+        .problem-class { background color: red; color: white; }
+        .good-boy-class { background-color: red; color: white; }
+       `;
+
+      var output = parse(styles);
+      var errors = output.errors;
+      var ast = output.ast;
+
+      expect(ast.rules.length).toEqual(2);
+
+      var rule1 = <CssSelectorRuleAST>ast.rules[0];
+      expect(rule1.block.entries.length).toEqual(2);
+
+      var style1 = <CssDefinitionAST>rule1.block.entries[0];
+      expect(style1.property.strValue).toEqual('background color');
+      assertTokens(style1.value.tokens, ['red']);
+
+      var style2 = <CssDefinitionAST>rule1.block.entries[1];
+      expect(style2.property.strValue).toEqual('color');
+      assertTokens(style2.value.tokens, ['white']);
+    });
+
+    it('should parse minified CSS content properly', () => {
+      // this code was taken from the angular.io webpage's CSS code
+      var styles = `
+.is-hidden{display:none!important}
+.is-visible{display:block!important}
+.is-visually-hidden{height:1px;width:1px;overflow:hidden;opacity:0.01;position:absolute;bottom:0;right:0;z-index:1}
+.grid-fluid,.grid-fixed{margin:0 auto}
+.grid-fluid .c1,.grid-fixed .c1,.grid-fluid .c2,.grid-fixed .c2,.grid-fluid .c3,.grid-fixed .c3,.grid-fluid .c4,.grid-fixed .c4,.grid-fluid .c5,.grid-fixed .c5,.grid-fluid .c6,.grid-fixed .c6,.grid-fluid .c7,.grid-fixed .c7,.grid-fluid .c8,.grid-fixed .c8,.grid-fluid .c9,.grid-fixed .c9,.grid-fluid .c10,.grid-fixed .c10,.grid-fluid .c11,.grid-fixed .c11,.grid-fluid .c12,.grid-fixed .c12{display:inline;float:left}
+.grid-fluid .c1.grid-right,.grid-fixed .c1.grid-right,.grid-fluid .c2.grid-right,.grid-fixed .c2.grid-right,.grid-fluid .c3.grid-right,.grid-fixed .c3.grid-right,.grid-fluid .c4.grid-right,.grid-fixed .c4.grid-right,.grid-fluid .c5.grid-right,.grid-fixed .c5.grid-right,.grid-fluid .c6.grid-right,.grid-fixed .c6.grid-right,.grid-fluid .c7.grid-right,.grid-fixed .c7.grid-right,.grid-fluid .c8.grid-right,.grid-fixed .c8.grid-right,.grid-fluid .c9.grid-right,.grid-fixed .c9.grid-right,.grid-fluid .c10.grid-right,.grid-fixed .c10.grid-right,.grid-fluid .c11.grid-right,.grid-fixed .c11.grid-right,.grid-fluid .c12.grid-right,.grid-fixed .c12.grid-right{float:right}
+.grid-fluid .c1.nb,.grid-fixed .c1.nb,.grid-fluid .c2.nb,.grid-fixed .c2.nb,.grid-fluid .c3.nb,.grid-fixed .c3.nb,.grid-fluid .c4.nb,.grid-fixed .c4.nb,.grid-fluid .c5.nb,.grid-fixed .c5.nb,.grid-fluid .c6.nb,.grid-fixed .c6.nb,.grid-fluid .c7.nb,.grid-fixed .c7.nb,.grid-fluid .c8.nb,.grid-fixed .c8.nb,.grid-fluid .c9.nb,.grid-fixed .c9.nb,.grid-fluid .c10.nb,.grid-fixed .c10.nb,.grid-fluid .c11.nb,.grid-fixed .c11.nb,.grid-fluid .c12.nb,.grid-fixed .c12.nb{margin-left:0}
+.grid-fluid .c1.na,.grid-fixed .c1.na,.grid-fluid .c2.na,.grid-fixed .c2.na,.grid-fluid .c3.na,.grid-fixed .c3.na,.grid-fluid .c4.na,.grid-fixed .c4.na,.grid-fluid .c5.na,.grid-fixed .c5.na,.grid-fluid .c6.na,.grid-fixed .c6.na,.grid-fluid .c7.na,.grid-fixed .c7.na,.grid-fluid .c8.na,.grid-fixed .c8.na,.grid-fluid .c9.na,.grid-fixed .c9.na,.grid-fluid .c10.na,.grid-fixed .c10.na,.grid-fluid .c11.na,.grid-fixed .c11.na,.grid-fluid .c12.na,.grid-fixed .c12.na{margin-right:0}
+       `;
+
+      var output = parse(styles);
+      var errors = output.errors;
+      expect(errors.length).toEqual(0);
+
+      var ast = output.ast;
+      expect(ast.rules.length).toEqual(8);
+    });
+
+    it('should parse a snippet of keyframe code from animate.css properly', () => {
+      // this code was taken from the angular.io webpage's CSS code
+      var styles = `
+@charset "UTF-8";
+
+/*!
+ * animate.css -http://daneden.me/animate
+ * Version - 3.5.1
+ * Licensed under the MIT license - http://opensource.org/licenses/MIT
+ *
+ * Copyright (c) 2016 Daniel Eden
+ */
+
+.animated {
+  -webkit-animation-duration: 1s;
+  animation-duration: 1s;
+  -webkit-animation-fill-mode: both;
+  animation-fill-mode: both;
+}
+
+.animated.infinite {
+  -webkit-animation-iteration-count: infinite;
+  animation-iteration-count: infinite;
+}
+
+.animated.hinge {
+  -webkit-animation-duration: 2s;
+  animation-duration: 2s;
+}
+
+.animated.flipOutX,
+.animated.flipOutY,
+.animated.bounceIn,
+.animated.bounceOut {
+  -webkit-animation-duration: .75s;
+  animation-duration: .75s;
+}
+
+@-webkit-keyframes bounce {
+  from, 20%, 53%, 80%, to {
+    -webkit-animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
+    animation-timing-function: cubic-bezier(0.215, 0.610, 0.355, 1.000);
+    -webkit-transform: translate3d(0,0,0);
+    transform: translate3d(0,0,0);
+  }
+
+  40%, 43% {
+    -webkit-animation-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
+    animation-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
+    -webkit-transform: translate3d(0, -30px, 0);
+    transform: translate3d(0, -30px, 0);
+  }
+
+  70% {
+    -webkit-animation-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
+    animation-timing-function: cubic-bezier(0.755, 0.050, 0.855, 0.060);
+    -webkit-transform: translate3d(0, -15px, 0);
+    transform: translate3d(0, -15px, 0);
+  }
+
+  90% {
+    -webkit-transform: translate3d(0,-4px,0);
+    transform: translate3d(0,-4px,0);
+  }
+}
+       `;
+
+      var output = parse(styles);
+      var errors = output.errors;
+      expect(errors.length).toEqual(0);
+
+      var ast = output.ast;
+      expect(ast.rules.length).toEqual(6);
+
+      var finalRule = <CssSelectorRuleAST>ast.rules[ast.rules.length - 1];
+      expect(finalRule.type).toEqual(BlockType.Keyframes);
+      expect(finalRule.block.entries.length).toEqual(4);
+    });
+  });
+}

modules/angular2/test/compiler/css/visitor_spec.ts

@@ -0,0 +1,262 @@
+import {
+  ddescribe,
+  describe,
+  it,
+  iit,
+  xit,
+  expect,
+  beforeEach,
+  afterEach
+} from 'angular2/testing_internal';
+
+export function assertTokens(tokens, valuesArr) {
+  for (var i = 0; i < tokens.length; i++) {
+    expect(tokens[i].strValue == valuesArr[i]);
+  }
+}
+
+import {NumberWrapper, StringWrapper, isPresent} from "angular2/src/facade/lang";
+import {BaseException} from 'angular2/src/facade/exceptions';
+
+import {
+  CssToken,
+  CssParser,
+  CssParseError,
+  BlockType,
+  CssAST,
+  CssSelectorRuleAST,
+  CssKeyframeRuleAST,
+  CssKeyframeDefinitionAST,
+  CssBlockDefinitionRuleAST,
+  CssMediaQueryRuleAST,
+  CssBlockRuleAST,
+  CssInlineRuleAST,
+  CssStyleValueAST,
+  CssSelectorAST,
+  CssDefinitionAST,
+  CssStyleSheetAST,
+  CssRuleAST,
+  CssBlockAST,
+  CssASTVisitor,
+  CssUnknownTokenListAST
+} from 'angular2/src/compiler/css/parser';
+
+import {CssLexer} from 'angular2/src/compiler/css/lexer';
+
+class MyVisitor implements CssASTVisitor {
+  captures = {};
+
+  _capture(method, ast, context) {
+    this.captures[method] = isPresent(this.captures[method]) ? this.captures[method] : [];
+    this.captures[method].push([ast, context]);
+  }
+
+  constructor(ast: CssStyleSheetAST, context) {
+    ast.visit(this, context);
+  }
+
+  visitCssValue(ast, context): void {
+    this._capture("visitCssValue", ast, context);
+  }
+
+  visitInlineCssRule(ast, context): void {
+    this._capture("visitInlineCssRule", ast, context);
+  }
+
+  visitCssKeyframeRule(ast: CssKeyframeRuleAST, context): void {
+    this._capture("visitCssKeyframeRule", ast, context);
+    ast.block.visit(this, context);
+  }
+
+  visitCssKeyframeDefinition(ast: CssKeyframeDefinitionAST, context?: any): void {
+    this._capture("visitCssKeyframeDefinition", ast, context);
+    ast.block.visit(this, context);
+  }
+
+  visitCssMediaQueryRule(ast: CssMediaQueryRuleAST, context): void {
+    this._capture("visitCssMediaQueryRule", ast, context);
+    ast.block.visit(this, context);
+  }
+
+  visitCssSelectorRule(ast: CssSelectorRuleAST, context): void {
+    this._capture("visitCssSelectorRule", ast, context);
+    ast.selectors.forEach((selAST: CssSelectorAST) => {
+      selAST.visit(this, context);
+    });
+    ast.block.visit(this, context);
+  }
+
+  visitCssSelector(ast: CssSelectorAST, context): void {
+    this._capture("visitCssSelector", ast, context);
+  }
+
+  visitCssDefinition(ast: CssDefinitionAST, context): void {
+    this._capture("visitCssDefinition", ast, context);
+    ast.value.visit(this, context);
+  }
+
+  visitCssBlock(ast: CssBlockAST, context): void {
+    this._capture("visitCssBlock", ast, context);
+    ast.entries.forEach((entryAST: CssAST) => {
+      entryAST.visit(this, context);
+    });
+  }
+
+  visitCssStyleSheet(ast, context): void {
+    this._capture("visitCssStyleSheet", ast, context);
+    ast.rules.forEach((ruleAST: CssSelectorRuleAST) => {
+      ruleAST.visit(this, context);
+    });
+  }
+
+  visitUnkownRule(ast: CssUnknownTokenListAST, context?: any): void {
+    // nothing
+  }
+}
+
+export function main() {
+  function parse(cssCode: string) {
+    var lexer = new CssLexer();
+    var scanner = lexer.scan(cssCode);
+    var parser = new CssParser(scanner, 'some-fake-file-name.css');
+    var output = parser.parse();
+    var errors = output.errors;
+    if (errors.length > 0) {
+      throw new BaseException(errors.map((error: CssParseError) => error.msg).join(', '));
+    }
+    return output.ast;
+  }
+
+  describe('CSS parsing and visiting', () => {
+    var ast;
+    var context = {};
+
+    beforeEach(() => {
+      var cssCode = `
+        .rule1 { prop1: value1 }
+        .rule2 { prop2: value2 }
+
+        @media all (max-width: 100px) {
+          #id { prop3 :value3; }
+        }
+
+        @import url(file.css);
+
+        @keyframes rotate {
+          from {
+            prop4: value4;
+          }
+          50%, 100% {
+            prop5: value5;
+          }
+        }
+      `;
+      ast = parse(cssCode);
+    });
+
+    it('should parse and visit a stylesheet', () => {
+      var visitor = new MyVisitor(ast, context);
+      var captures = visitor.captures['visitCssStyleSheet'];
+
+      expect(captures.length).toEqual(1);
+
+      var capture = captures[0];
+      expect(capture[0]).toEqual(ast);
+      expect(capture[1]).toEqual(context);
+    });
+
+    it('should parse and visit each of the stylesheet selectors', () => {
+      var visitor = new MyVisitor(ast, context);
+      var captures = visitor.captures['visitCssSelectorRule'];
+
+      expect(captures.length).toEqual(3);
+
+      var rule1 = <CssSelectorRuleAST>captures[0][0];
+      expect(rule1).toEqual(ast.rules[0]);
+      assertTokens(rule1.selectors[0].tokens, ['.', 'rule1']);
+
+      var rule2 = <CssSelectorRuleAST>captures[1][0];
+      expect(rule2).toEqual(ast.rules[1]);
+      assertTokens(rule2.selectors[0].tokens, ['.', 'rule2']);
+
+      var rule3 = captures[2][0];
+      expect(rule3).toEqual((<CssMediaQueryRuleAST>ast.rules[2]).block.entries[0]);
+      assertTokens(rule3.selectors[0].tokens, ['#', 'rule3']);
+    });
+
+    it('should parse and visit each of the stylesheet style key/value definitions', () => {
+      var visitor = new MyVisitor(ast, context);
+      var captures = visitor.captures['visitCssDefinition'];
+
+      expect(captures.length).toEqual(5);
+
+      var def1 = <CssDefinitionAST>captures[0][0];
+      expect(def1.property.strValue).toEqual('prop1');
+      expect(def1.value.tokens[0].strValue).toEqual('value1');
+
+      var def2 = <CssDefinitionAST>captures[1][0];
+      expect(def2.property.strValue).toEqual('prop2');
+      expect(def2.value.tokens[0].strValue).toEqual('value2');
+
+      var def3 = <CssDefinitionAST>captures[2][0];
+      expect(def3.property.strValue).toEqual('prop3');
+      expect(def3.value.tokens[0].strValue).toEqual('value3');
+
+      var def4 = <CssDefinitionAST>captures[3][0];
+      expect(def4.property.strValue).toEqual('prop4');
+      expect(def4.value.tokens[0].strValue).toEqual('value4');
+
+      var def5 = <CssDefinitionAST>captures[4][0];
+      expect(def5.property.strValue).toEqual('prop5');
+      expect(def5.value.tokens[0].strValue).toEqual('value5');
+    });
+
+    it('should parse and visit the associated media query values', () => {
+      var visitor = new MyVisitor(ast, context);
+      var captures = visitor.captures['visitCssMediaQueryRule'];
+
+      expect(captures.length).toEqual(1);
+
+      var query1 = <CssMediaQueryRuleAST>captures[0][0];
+      assertTokens(query1.query, ['all','(','max-width','100','px',')']);
+      expect(query1.block.entries.length).toEqual(1);
+    });
+
+    it('should parse and visit the associated "@inline" rule values', () => {
+      var visitor = new MyVisitor(ast, context);
+      var captures = visitor.captures['visitInlineCssRule'];
+
+      expect(captures.length).toEqual(1);
+
+      var query1 = <CssInlineRuleAST>captures[0][0];
+      expect(query1.type).toEqual(BlockType.Import);
+      assertTokens(query1.value.tokens, ['url','(','file.css',')']);
+    });
+
+    it('should parse and visit the keyframe blocks', () => {
+      var visitor = new MyVisitor(ast, context);
+      var captures = visitor.captures['visitCssKeyframeRule'];
+
+      expect(captures.length).toEqual(1);
+
+      var keyframe1 = <CssKeyframeRuleAST>captures[0][0];
+      expect(keyframe1.name.strValue).toEqual('rotate');
+      expect(keyframe1.block.entries.length).toEqual(2);
+    });
+
+    it('should parse and visit the associated keyframe rules', () => {
+      var visitor = new MyVisitor(ast, context);
+      var captures = visitor.captures['visitCssKeyframeDefinition'];
+
+      expect(captures.length).toEqual(2);
+
+      var def1 = <CssKeyframeDefinitionAST>captures[0][0];
+      assertTokens(def1.steps, ['from']);
+      expect(def1.block.entries.length).toEqual(1);
+
+      var def2 = <CssKeyframeDefinitionAST>captures[1][0];
+      assertTokens(def2.steps, ['50%', '100%']);
+      expect(def2.block.entries.length).toEqual(1);
+    });
+  });
+}