Beginning of CSS parser using frog parsering infrastructure.

utils/tests/css/src/SelectorLiteralTest.dart

+// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+#import("../../../css/css.dart");
+
+class SelectorLiteralTest {
+  static final String ERROR = 'CompilerException: <buffer>:';
+
+  static testMain() {
+    initCssWorld();
+
+    testSimpleClassSelectorSuccesses();
+    testSimpleClassSelectorFailures();
+    testPrivateNameFailures();
+  }
+
+  static void testSimpleClassSelectorSuccesses() {
+    List<String> knownClasses = ['foobar', 'xyzzy', 'a-story', 'b-story'];
+    List<String> knownIds = ['id1', 'id2', 'id-number-3'];
+
+    CssWorld cssWorld = new CssWorld(knownClasses, knownIds);
+
+    try {
+      // Valid selectors for class names.
+      cssParseAndValidate('@{.foobar}', cssWorld);
+      cssParseAndValidate('@{.foobar .xyzzy}', cssWorld);
+      cssParseAndValidate('@{.foobar .a-story .xyzzy}', cssWorld);
+      cssParseAndValidate('@{.foobar .xyzzy .a-story .b-story}', cssWorld);
+
+      // Valid selectors for element IDs.
+      cssParseAndValidate('@{#id1}', cssWorld);
+      cssParseAndValidate('@{#id-number-3}', cssWorld);
+      cssParseAndValidate('@{#_privateId}', cssWorld);
+
+      // Valid selectors for private class names (leading underscore).
+      cssParseAndValidate('@{.foobar ._privateClass}', cssWorld);
+      cssParseAndValidate('@{.foobar ._privateClass .xyzzy}', cssWorld);
+      cssParseAndValidate('@{.foobar ._private1 .xyzzy ._private2}', cssWorld);
+
+      // Valid selectors for private element IDs (leading underscore).
+      cssParseAndValidate('@{._privateClass}', cssWorld);
+    } catch (var e) {
+      // CSS Expressions failed
+      Expect.fail(e.toString());
+    }
+  }
+
+  static void testSimpleClassSelectorFailures() {
+    List<String> knownClasses = ['foobar', 'xyzzy', 'a-story', 'b-story'];
+    List<String> knownIds = ['id1', 'id2', 'id-number-3'];
+
+    CssWorld cssWorld = new CssWorld(knownClasses, knownIds);
+
+    // Invalid class name.
+    String css = '@{.-foobar}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("${ERROR}1:4: fatal: expected identifier\n${css}\n   ^",
+          e.toString());
+    }
+
+    // Error this class name is not known.
+    css = '@{.foobar1}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Unknown selector name .foobar1",
+          e.toString());
+    }
+
+    // Error if any class name is not known.
+    css = '@{.foobar .xyzzy1}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Unknown selector name .xyzzy1",
+          e.toString());
+    }
+
+    // Test for invalid class name (can't start with number).
+    css = '@{.foobar .1a-story .xyzzy}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals(
+          "${ERROR}1:12: fatal: expected identifier\n${css}\n           ^^",
+          e.toString());
+    }
+
+    // element id must be single selector.
+    css = '@{#id1 #id2}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Use of Id selector must be " +
+          "singleton starting at #id2", e.toString());
+    }
+
+    // element id must be single selector.
+    css = '@{#id-number-3 .foobar}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("@{#id-number-3 .foobar} should not succeed.");
+    } catch (var e) {
+      // CSS Expressions failed
+      Expect.equals("CssSelectorException: Can not mix Id selector with "+
+          "class selector(s). Id selector must be singleton too many " +
+          "starting at .foobar", e.toString(), '');
+    }
+
+    // element id must be alone and only one element id.
+    css = '@{.foobar #id-number-3 #id1}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      // CSS Expressions failed
+      Expect.equals("CssSelectorException: Use of Id selector must be " +
+          "singleton starting at #id-number-3", e.toString());
+    }
+
+    // Namespace selector not valid in @{css_expression}
+    css = '@{foo|div}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Invalid selector foo|div",
+          e.toString());
+    }
+
+    // class and element id not allowed together. 
+    css = '@{.foobar foo|div}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("$css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Invalid selector foo|div",
+          e.toString());
+    }
+
+    // Element id and namespace not allowed together. 
+    css = '@{#id1 foo|div}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Invalid selector foo|div",
+          e.toString());
+    }
+
+    // namespace and element id not allowed together. 
+    css = '@{foo|div #id1}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Invalid selector foo|div",
+          e.toString());
+    }
+
+    // namespace / element not allowed.
+    css = '@{foo|div .foobar}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Invalid selector foo|div",
+          e.toString());
+    }
+
+    // Combinators not allowed.
+    css = '@{.foobar > .xyzzy}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Selectors can not have combinators (>, +, or ~) before .xyzzy",
+          e.toString());
+    }
+  }
+
+  static void testPrivateNameFailures() {
+    List<String> knownClasses = ['foobar', 'xyzzy', 'a-story', 'b-story'];
+    List<String> knownIds = ['id1', 'id2', 'id-number-3'];
+
+    CssWorld cssWorld = new CssWorld(knownClasses, knownIds);
+
+    // Too many.
+    String css = '@{._private #id2}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Use of Id selector must be " +
+          "singleton starting at #id2", e.toString());
+    }
+
+    // Unknown class foobar2.
+    css = '@{._private .foobar2}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Unknown selector name .foobar2",
+          e.toString());
+    }
+
+    // Too many element IDs.
+    css = '@{#_privateId #id2}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Use of Id selector must be " +
+          "singleton starting at #id2", e.toString());
+    }
+
+    // Too many element IDs.
+    css = '@{#_privateId1 #_privateId2}';
+    try {
+      cssParseAndValidate('${css}', cssWorld);
+      Expect.fail("${css} should not succeed.");
+    } catch (var e) {
+      Expect.equals("CssSelectorException: Use of Id selector must be " +
+          "singleton starting at #_privateId2", e.toString());
+    }
+  }
+
+}
+
+main() {
+  SelectorLiteralTest.testMain();
+}