move html5lib code into dart svn repo

pkg/third_party/html5lib/lib/src/token.dart

+/** This library contains token types used by the html5 tokenizer. */
+library token;
+
+import 'dart:collection';
+import 'package:source_maps/span.dart' show FileSpan;
+
+/** An html5 token. */
+abstract class Token {
+  FileSpan span;
+
+  int get kind;
+}
+
+abstract class TagToken extends Token {
+  String name;
+
+  bool selfClosing;
+
+  TagToken(this.name, this.selfClosing);
+}
+
+class StartTagToken extends TagToken {
+  /**
+   * The tag's attributes. A map from the name to the value, where the name
+   * can be a [String] or [AttributeName].
+   */
+  LinkedHashMap<dynamic, String> data;
+
+  /** The attribute spans if requested. Otherwise null. */
+  List<TagAttribute> attributeSpans;
+
+  bool selfClosingAcknowledged;
+
+  /** The namespace. This is filled in later during tree building. */
+  String namespace;
+
+  StartTagToken(String name, {this.data, bool selfClosing: false,
+      this.selfClosingAcknowledged: false, this.namespace})
+      : super(name, selfClosing);
+
+  int get kind => TokenKind.startTag;
+}
+
+class EndTagToken extends TagToken {
+  EndTagToken(String name, {bool selfClosing: false})
+      : super(name, selfClosing);
+
+  int get kind => TokenKind.endTag;
+}
+
+abstract class StringToken extends Token {
+  String data;
+  StringToken(this.data);
+}
+
+class ParseErrorToken extends StringToken {
+  /** Extra information that goes along with the error message. */
+  Map messageParams;
+
+  ParseErrorToken(String data, {this.messageParams}) : super(data);
+
+  int get kind => TokenKind.parseError;
+}
+
+class CharactersToken extends StringToken {
+  CharactersToken([String data]) : super(data);
+
+  int get kind => TokenKind.characters;
+}
+
+class SpaceCharactersToken extends StringToken {
+  SpaceCharactersToken([String data]) : super(data);
+
+  int get kind => TokenKind.spaceCharacters;
+}
+
+class CommentToken extends StringToken {
+  CommentToken([String data]) : super(data);
+
+  int get kind => TokenKind.comment;
+}
+
+class DoctypeToken extends Token {
+  String publicId;
+  String systemId;
+  String name = "";
+  bool correct;
+
+  DoctypeToken({this.publicId, this.systemId, this.correct: false});
+
+  int get kind => TokenKind.doctype;
+}
+
+/**
+ * These are used by the tokenizer to build up the attribute map.
+ * They're also used by [StartTagToken.attributeSpans] if attribute spans are
+ * requested.
+ */
+class TagAttribute {
+  String name;
+  String value;
+
+  // The spans of the attribute. This is not used unless we are computing an
+  // attribute span on demand.
+  int start;
+  int end;
+  int startValue;
+  int endValue;
+
+  TagAttribute(this.name, [this.value = '']);
+}
+
+
+class TokenKind {
+  static const int spaceCharacters = 0;
+  static const int characters = 1;
+  static const int startTag = 2;
+  static const int endTag = 3;
+  static const int comment = 4;
+  static const int doctype = 5;
+  static const int parseError = 6;
+}