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csslib/lib/src/validate.dart

-// Copyright (c) 2012, 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.
-
-library csslib.src.validate;
-
-import 'package:csslib/visitor.dart';
-import 'package:source_span/source_span.dart';
-
-/** Can be thrown on any Css runtime problem includes source location. */
-class CssSelectorException extends SourceSpanException {
-  CssSelectorException(String message, [SourceSpan span])
-      : super(message, span);
-}
-
-List<String> classes = [];
-List<String> ids = [];
-
-class Validate {
-  static int _classNameCheck(var selector, int matches) {
-    if (selector.isCombinatorDescendant() ||
-        (selector.isCombinatorNone() && matches == 0)) {
-      if (matches < 0) {
-        String tooMany = selector.simpleSelector.toString();
-        throw new CssSelectorException(
-            'Can not mix Id selector with class selector(s). Id '
-            'selector must be singleton too many starting at $tooMany');
-      }
-
-      return matches + 1;
-    } else {
-      String error = selector.toString();
-      throw new CssSelectorException(
-          'Selectors can not have combinators (>, +, or ~) before $error');
-    }
-  }
-
-  static int _elementIdCheck(var selector, int matches) {
-    if (selector.isCombinatorNone() && matches == 0) {
-      // Perfect just one element id returns matches of -1.
-      return -1;
-    } else if (selector.isCombinatorDescendant()) {
-      String tooMany = selector.simpleSelector.toString();
-      throw new CssSelectorException(
-          'Use of Id selector must be singleton starting at $tooMany');
-    } else {
-      String error = selector.simpleSelector.toString();
-      throw new CssSelectorException(
-          'Selectors can not have combinators (>, +, or ~) before $error');
-    }
-  }
-
-  // Validate the @{css expression} only .class and #elementId are valid inside
-  // of @{...}.
-  static template(List<Selector> selectors) {
-    var errorSelector; // signal which selector didn't match.
-    bool found = false; // signal if a selector is matched.
-    int matches = 0; // < 0 IdSelectors, > 0 ClassSelector
-
-    // At most one selector group (any number of simple selector sequences).
-    assert(selectors.length <= 1);
-
-    for (final sels in selectors) {
-      for (final selector in sels.simpleSelectorSequences) {
-        found = false;
-        var simpleSelector = selector.simpleSelector;
-        if (simpleSelector is ClassSelector) {
-          // Any class name starting with an underscore is a private class name
-          // that doesn't have to match the world of known classes.
-          if (!simpleSelector.name.startsWith('_')) {
-            // TODO(terry): For now iterate through all classes look for faster
-            //              mechanism hash map, etc.
-            for (final className in classes) {
-              if (selector.simpleSelector.name == className) {
-                matches = _classNameCheck(selector, matches);
-                found = true; // .class found.
-                break;
-              }
-              for (final className2 in classes) {
-                print(className2);
-              }
-            }
-          } else {
-            // Don't check any class name that is prefixed with an underscore.
-            // However, signal as found and bump up matches; it's a valid class
-            // name.
-            matches = _classNameCheck(selector, matches);
-            found = true; // ._class are always okay.
-          }
-        } else if (simpleSelector is IdSelector) {
-          // Any element id starting with an underscore is a private element id
-          // that doesn't have to match the world of known elemtn ids.
-          if (!simpleSelector.name.startsWith('_')) {
-            for (final id in ids) {
-              if (simpleSelector.name == id) {
-                matches = _elementIdCheck(selector, matches);
-                found = true; // #id found.
-                break;
-              }
-            }
-          } else {
-            // Don't check any element ID that is prefixed with an underscore.
-            // Signal as found and bump up matches; it's a valid element ID.
-            matches = _elementIdCheck(selector, matches);
-            found = true; // #_id are always okay
-          }
-        } else {
-          String badSelector = simpleSelector.toString();
-          throw new CssSelectorException(
-              'Invalid template selector $badSelector');
-        }
-
-        if (!found) {
-          String unknownName = simpleSelector.toString();
-          throw new CssSelectorException('Unknown selector name $unknownName');
-        }
-      }
-    }
-
-    // Every selector must match.
-    Selector selector = selectors[0];
-    assert((matches >= 0 ? matches : -matches) ==
-        selector.simpleSelectorSequences.length);
-  }
-}