The_Great_Beyond/node_modules/parse5/dist/tokenizer/index.js

import { Preprocessor } from './preprocessor.js';
import { CODE_POINTS as $, SEQUENCES as $$, REPLACEMENT_CHARACTER, isSurrogate, isUndefinedCodePoint, isControlCodePoint, } from '../common/unicode.js';
import { TokenType, getTokenAttr, } from '../common/token.js';
import { htmlDecodeTree, EntityDecoder, DecodingMode } from 'entities/lib/decode.js';
import { ERR } from '../common/error-codes.js';
import { TAG_ID, getTagID } from '../common/html.js';
//States
var State;
(function (State) {
    State[State["DATA"] = 0] = "DATA";
    State[State["RCDATA"] = 1] = "RCDATA";
    State[State["RAWTEXT"] = 2] = "RAWTEXT";
    State[State["SCRIPT_DATA"] = 3] = "SCRIPT_DATA";
    State[State["PLAINTEXT"] = 4] = "PLAINTEXT";
    State[State["TAG_OPEN"] = 5] = "TAG_OPEN";
    State[State["END_TAG_OPEN"] = 6] = "END_TAG_OPEN";
    State[State["TAG_NAME"] = 7] = "TAG_NAME";
    State[State["RCDATA_LESS_THAN_SIGN"] = 8] = "RCDATA_LESS_THAN_SIGN";
    State[State["RCDATA_END_TAG_OPEN"] = 9] = "RCDATA_END_TAG_OPEN";
    State[State["RCDATA_END_TAG_NAME"] = 10] = "RCDATA_END_TAG_NAME";
    State[State["RAWTEXT_LESS_THAN_SIGN"] = 11] = "RAWTEXT_LESS_THAN_SIGN";
    State[State["RAWTEXT_END_TAG_OPEN"] = 12] = "RAWTEXT_END_TAG_OPEN";
    State[State["RAWTEXT_END_TAG_NAME"] = 13] = "RAWTEXT_END_TAG_NAME";
    State[State["SCRIPT_DATA_LESS_THAN_SIGN"] = 14] = "SCRIPT_DATA_LESS_THAN_SIGN";
    State[State["SCRIPT_DATA_END_TAG_OPEN"] = 15] = "SCRIPT_DATA_END_TAG_OPEN";
    State[State["SCRIPT_DATA_END_TAG_NAME"] = 16] = "SCRIPT_DATA_END_TAG_NAME";
    State[State["SCRIPT_DATA_ESCAPE_START"] = 17] = "SCRIPT_DATA_ESCAPE_START";
    State[State["SCRIPT_DATA_ESCAPE_START_DASH"] = 18] = "SCRIPT_DATA_ESCAPE_START_DASH";
    State[State["SCRIPT_DATA_ESCAPED"] = 19] = "SCRIPT_DATA_ESCAPED";
    State[State["SCRIPT_DATA_ESCAPED_DASH"] = 20] = "SCRIPT_DATA_ESCAPED_DASH";
    State[State["SCRIPT_DATA_ESCAPED_DASH_DASH"] = 21] = "SCRIPT_DATA_ESCAPED_DASH_DASH";
    State[State["SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN"] = 22] = "SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN";
    State[State["SCRIPT_DATA_ESCAPED_END_TAG_OPEN"] = 23] = "SCRIPT_DATA_ESCAPED_END_TAG_OPEN";
    State[State["SCRIPT_DATA_ESCAPED_END_TAG_NAME"] = 24] = "SCRIPT_DATA_ESCAPED_END_TAG_NAME";
    State[State["SCRIPT_DATA_DOUBLE_ESCAPE_START"] = 25] = "SCRIPT_DATA_DOUBLE_ESCAPE_START";
    State[State["SCRIPT_DATA_DOUBLE_ESCAPED"] = 26] = "SCRIPT_DATA_DOUBLE_ESCAPED";
    State[State["SCRIPT_DATA_DOUBLE_ESCAPED_DASH"] = 27] = "SCRIPT_DATA_DOUBLE_ESCAPED_DASH";
    State[State["SCRIPT_DATA_DOUBLE_ESCAPED_DASH_DASH"] = 28] = "SCRIPT_DATA_DOUBLE_ESCAPED_DASH_DASH";
    State[State["SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN"] = 29] = "SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN";
    State[State["SCRIPT_DATA_DOUBLE_ESCAPE_END"] = 30] = "SCRIPT_DATA_DOUBLE_ESCAPE_END";
    State[State["BEFORE_ATTRIBUTE_NAME"] = 31] = "BEFORE_ATTRIBUTE_NAME";
    State[State["ATTRIBUTE_NAME"] = 32] = "ATTRIBUTE_NAME";
    State[State["AFTER_ATTRIBUTE_NAME"] = 33] = "AFTER_ATTRIBUTE_NAME";
    State[State["BEFORE_ATTRIBUTE_VALUE"] = 34] = "BEFORE_ATTRIBUTE_VALUE";
    State[State["ATTRIBUTE_VALUE_DOUBLE_QUOTED"] = 35] = "ATTRIBUTE_VALUE_DOUBLE_QUOTED";
    State[State["ATTRIBUTE_VALUE_SINGLE_QUOTED"] = 36] = "ATTRIBUTE_VALUE_SINGLE_QUOTED";
    State[State["ATTRIBUTE_VALUE_UNQUOTED"] = 37] = "ATTRIBUTE_VALUE_UNQUOTED";
    State[State["AFTER_ATTRIBUTE_VALUE_QUOTED"] = 38] = "AFTER_ATTRIBUTE_VALUE_QUOTED";
    State[State["SELF_CLOSING_START_TAG"] = 39] = "SELF_CLOSING_START_TAG";
    State[State["BOGUS_COMMENT"] = 40] = "BOGUS_COMMENT";
    State[State["MARKUP_DECLARATION_OPEN"] = 41] = "MARKUP_DECLARATION_OPEN";
    State[State["COMMENT_START"] = 42] = "COMMENT_START";
    State[State["COMMENT_START_DASH"] = 43] = "COMMENT_START_DASH";
    State[State["COMMENT"] = 44] = "COMMENT";
    State[State["COMMENT_LESS_THAN_SIGN"] = 45] = "COMMENT_LESS_THAN_SIGN";
    State[State["COMMENT_LESS_THAN_SIGN_BANG"] = 46] = "COMMENT_LESS_THAN_SIGN_BANG";
    State[State["COMMENT_LESS_THAN_SIGN_BANG_DASH"] = 47] = "COMMENT_LESS_THAN_SIGN_BANG_DASH";
    State[State["COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH"] = 48] = "COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH";
    State[State["COMMENT_END_DASH"] = 49] = "COMMENT_END_DASH";
    State[State["COMMENT_END"] = 50] = "COMMENT_END";
    State[State["COMMENT_END_BANG"] = 51] = "COMMENT_END_BANG";
    State[State["DOCTYPE"] = 52] = "DOCTYPE";
    State[State["BEFORE_DOCTYPE_NAME"] = 53] = "BEFORE_DOCTYPE_NAME";
    State[State["DOCTYPE_NAME"] = 54] = "DOCTYPE_NAME";
    State[State["AFTER_DOCTYPE_NAME"] = 55] = "AFTER_DOCTYPE_NAME";
    State[State["AFTER_DOCTYPE_PUBLIC_KEYWORD"] = 56] = "AFTER_DOCTYPE_PUBLIC_KEYWORD";
    State[State["BEFORE_DOCTYPE_PUBLIC_IDENTIFIER"] = 57] = "BEFORE_DOCTYPE_PUBLIC_IDENTIFIER";
    State[State["DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED"] = 58] = "DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED";
    State[State["DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED"] = 59] = "DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED";
    State[State["AFTER_DOCTYPE_PUBLIC_IDENTIFIER"] = 60] = "AFTER_DOCTYPE_PUBLIC_IDENTIFIER";
    State[State["BETWEEN_DOCTYPE_PUBLIC_AND_SYSTEM_IDENTIFIERS"] = 61] = "BETWEEN_DOCTYPE_PUBLIC_AND_SYSTEM_IDENTIFIERS";
    State[State["AFTER_DOCTYPE_SYSTEM_KEYWORD"] = 62] = "AFTER_DOCTYPE_SYSTEM_KEYWORD";
    State[State["BEFORE_DOCTYPE_SYSTEM_IDENTIFIER"] = 63] = "BEFORE_DOCTYPE_SYSTEM_IDENTIFIER";
    State[State["DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED"] = 64] = "DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED";
    State[State["DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED"] = 65] = "DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED";
    State[State["AFTER_DOCTYPE_SYSTEM_IDENTIFIER"] = 66] = "AFTER_DOCTYPE_SYSTEM_IDENTIFIER";
    State[State["BOGUS_DOCTYPE"] = 67] = "BOGUS_DOCTYPE";
    State[State["CDATA_SECTION"] = 68] = "CDATA_SECTION";
    State[State["CDATA_SECTION_BRACKET"] = 69] = "CDATA_SECTION_BRACKET";
    State[State["CDATA_SECTION_END"] = 70] = "CDATA_SECTION_END";
    State[State["CHARACTER_REFERENCE"] = 71] = "CHARACTER_REFERENCE";
    State[State["AMBIGUOUS_AMPERSAND"] = 72] = "AMBIGUOUS_AMPERSAND";
})(State || (State = {}));
//Tokenizer initial states for different modes
export const TokenizerMode = {
    DATA: State.DATA,
    RCDATA: State.RCDATA,
    RAWTEXT: State.RAWTEXT,
    SCRIPT_DATA: State.SCRIPT_DATA,
    PLAINTEXT: State.PLAINTEXT,
    CDATA_SECTION: State.CDATA_SECTION,
};
//Utils
//OPTIMIZATION: these utility functions should not be moved out of this module. V8 Crankshaft will not inline
//this functions if they will be situated in another module due to context switch.
//Always perform inlining check before modifying this functions ('node --trace-inlining').
function isAsciiDigit(cp) {
    return cp >= $.DIGIT_0 && cp <= $.DIGIT_9;
}
function isAsciiUpper(cp) {
    return cp >= $.LATIN_CAPITAL_A && cp <= $.LATIN_CAPITAL_Z;
}
function isAsciiLower(cp) {
    return cp >= $.LATIN_SMALL_A && cp <= $.LATIN_SMALL_Z;
}
function isAsciiLetter(cp) {
    return isAsciiLower(cp) || isAsciiUpper(cp);
}
function isAsciiAlphaNumeric(cp) {
    return isAsciiLetter(cp) || isAsciiDigit(cp);
}
function toAsciiLower(cp) {
    return cp + 32;
}
function isWhitespace(cp) {
    return cp === $.SPACE || cp === $.LINE_FEED || cp === $.TABULATION || cp === $.FORM_FEED;
}
function isScriptDataDoubleEscapeSequenceEnd(cp) {
    return isWhitespace(cp) || cp === $.SOLIDUS || cp === $.GREATER_THAN_SIGN;
}
function getErrorForNumericCharacterReference(code) {
    if (code === $.NULL) {
        return ERR.nullCharacterReference;
    }
    else if (code > 1114111) {
        return ERR.characterReferenceOutsideUnicodeRange;
    }
    else if (isSurrogate(code)) {
        return ERR.surrogateCharacterReference;
    }
    else if (isUndefinedCodePoint(code)) {
        return ERR.noncharacterCharacterReference;
    }
    else if (isControlCodePoint(code) || code === $.CARRIAGE_RETURN) {
        return ERR.controlCharacterReference;
    }
    return null;
}
//Tokenizer
export class Tokenizer {
    constructor(options, handler) {
        this.options = options;
        this.handler = handler;
        this.paused = false;
        /** Ensures that the parsing loop isn't run multiple times at once. */
        this.inLoop = false;
        /**
         * Indicates that the current adjusted node exists, is not an element in the HTML namespace,
         * and that it is not an integration point for either MathML or HTML.
         *
         * @see {@link https://html.spec.whatwg.org/multipage/parsing.html#tree-construction}
         */
        this.inForeignNode = false;
        this.lastStartTagName = '';
        this.active = false;
        this.state = State.DATA;
        this.returnState = State.DATA;
        this.entityStartPos = 0;
        this.consumedAfterSnapshot = -1;
        this.currentCharacterToken = null;
        this.currentToken = null;
        this.currentAttr = { name: '', value: '' };
        this.preprocessor = new Preprocessor(handler);
        this.currentLocation = this.getCurrentLocation(-1);
        this.entityDecoder = new EntityDecoder(htmlDecodeTree, (cp, consumed) => {
            // Note: Set `pos` _before_ flushing, as flushing might drop
            // the current chunk and invalidate `entityStartPos`.
            this.preprocessor.pos = this.entityStartPos + consumed - 1;
            this._flushCodePointConsumedAsCharacterReference(cp);
        }, handler.onParseError
            ? {
                missingSemicolonAfterCharacterReference: () => {
                    this._err(ERR.missingSemicolonAfterCharacterReference, 1);
                },
                absenceOfDigitsInNumericCharacterReference: (consumed) => {
                    this._err(ERR.absenceOfDigitsInNumericCharacterReference, this.entityStartPos - this.preprocessor.pos + consumed);
                },
                validateNumericCharacterReference: (code) => {
                    const error = getErrorForNumericCharacterReference(code);
                    if (error)
                        this._err(error, 1);
                },
            }
            : undefined);
    }
    //Errors
    _err(code, cpOffset = 0) {
        var _a, _b;
        (_b = (_a = this.handler).onParseError) === null || _b === void 0 ? void 0 : _b.call(_a, this.preprocessor.getError(code, cpOffset));
    }
    // NOTE: `offset` may never run across line boundaries.
    getCurrentLocation(offset) {
        if (!this.options.sourceCodeLocationInfo) {
            return null;
        }
        return {
            startLine: this.preprocessor.line,
            startCol: this.preprocessor.col - offset,
            startOffset: this.preprocessor.offset - offset,
            endLine: -1,
            endCol: -1,
            endOffset: -1,
        };
    }
    _runParsingLoop() {
        if (this.inLoop)
            return;
        this.inLoop = true;
        while (this.active && !this.paused) {
            this.consumedAfterSnapshot = 0;
            const cp = this._consume();
            if (!this._ensureHibernation()) {
                this._callState(cp);
            }
        }
        this.inLoop = false;
    }
    //API
    pause() {
        this.paused = true;
    }
    resume(writeCallback) {
        if (!this.paused) {
            throw new Error('Parser was already resumed');
        }
        this.paused = false;
        // Necessary for synchronous resume.
        if (this.inLoop)
            return;
        this._runParsingLoop();
        if (!this.paused) {
            writeCallback === null || writeCallback === void 0 ? void 0 : writeCallback();
        }
    }
    write(chunk, isLastChunk, writeCallback) {
        this.active = true;
        this.preprocessor.write(chunk, isLastChunk);
        this._runParsingLoop();
        if (!this.paused) {
            writeCallback === null || writeCallback === void 0 ? void 0 : writeCallback();
        }
    }
    insertHtmlAtCurrentPos(chunk) {
        this.active = true;
        this.preprocessor.insertHtmlAtCurrentPos(chunk);
        this._runParsingLoop();
    }
    //Hibernation
    _ensureHibernation() {
        if (this.preprocessor.endOfChunkHit) {
            this.preprocessor.retreat(this.consumedAfterSnapshot);
            this.consumedAfterSnapshot = 0;
            this.active = false;
            return true;
        }
        return false;
    }
    //Consumption
    _consume() {
        this.consumedAfterSnapshot++;
        return this.preprocessor.advance();
    }
    _advanceBy(count) {
        this.consumedAfterSnapshot += count;
        for (let i = 0; i < count; i++) {
            this.preprocessor.advance();
        }
    }
    _consumeSequenceIfMatch(pattern, caseSensitive) {
        if (this.preprocessor.startsWith(pattern, caseSensitive)) {
            // We will already have consumed one character before calling this method.
            this._advanceBy(pattern.length - 1);
            return true;
        }
        return false;
    }
    //Token creation
    _createStartTagToken() {
        this.currentToken = {
            type: TokenType.START_TAG,
            tagName: '',
            tagID: TAG_ID.UNKNOWN,
            selfClosing: false,
            ackSelfClosing: false,
            attrs: [],
            location: this.getCurrentLocation(1),
        };
    }
    _createEndTagToken() {
        this.currentToken = {
            type: TokenType.END_TAG,
            tagName: '',
            tagID: TAG_ID.UNKNOWN,
            selfClosing: false,
            ackSelfClosing: false,
            attrs: [],
            location: this.getCurrentLocation(2),
        };
    }
    _createCommentToken(offset) {
        this.currentToken = {
            type: TokenType.COMMENT,
            data: '',
            location: this.getCurrentLocation(offset),
        };
    }
    _createDoctypeToken(initialName) {
        this.currentToken = {
            type: TokenType.DOCTYPE,
            name: initialName,
            forceQuirks: false,
            publicId: null,
            systemId: null,
            location: this.currentLocation,
        };
    }
    _createCharacterToken(type, chars) {
        this.currentCharacterToken = {
            type,
            chars,
            location: this.currentLocation,
        };
    }
    //Tag attributes
    _createAttr(attrNameFirstCh) {
        this.currentAttr = {
            name: attrNameFirstCh,
            value: '',
        };
        this.currentLocation = this.getCurrentLocation(0);
    }
    _leaveAttrName() {
        var _a;
        var _b;
        const token = this.currentToken;
        if (getTokenAttr(token, this.currentAttr.name) === null) {
            token.attrs.push(this.currentAttr);
            if (token.location && this.currentLocation) {
                const attrLocations = ((_a = (_b = token.location).attrs) !== null && _a !== void 0 ? _a : (_b.attrs = Object.create(null)));
                attrLocations[this.currentAttr.name] = this.currentLocation;
                // Set end location
                this._leaveAttrValue();
            }
        }
        else {
            this._err(ERR.duplicateAttribute);
        }
    }
    _leaveAttrValue() {
        if (this.currentLocation) {
            this.currentLocation.endLine = this.preprocessor.line;
            this.currentLocation.endCol = this.preprocessor.col;
            this.currentLocation.endOffset = this.preprocessor.offset;
        }
    }
    //Token emission
    prepareToken(ct) {
        this._emitCurrentCharacterToken(ct.location);
        this.currentToken = null;
        if (ct.location) {
            ct.location.endLine = this.preprocessor.line;
            ct.location.endCol = this.preprocessor.col + 1;
            ct.location.endOffset = this.preprocessor.offset + 1;
        }
        this.currentLocation = this.getCurrentLocation(-1);
    }
    emitCurrentTagToken() {
        const ct = this.currentToken;
        this.prepareToken(ct);
        ct.tagID = getTagID(ct.tagName);
        if (ct.type === TokenType.START_TAG) {
            this.lastStartTagName = ct.tagName;
            this.handler.onStartTag(ct);
        }
        else {
            if (ct.attrs.length > 0) {
                this._err(ERR.endTagWithAttributes);
            }
            if (ct.selfClosing) {
                this._err(ERR.endTagWithTrailingSolidus);
            }
            this.handler.onEndTag(ct);
        }
        this.preprocessor.dropParsedChunk();
    }
    emitCurrentComment(ct) {
        this.prepareToken(ct);
        this.handler.onComment(ct);
        this.preprocessor.dropParsedChunk();
    }
    emitCurrentDoctype(ct) {
        this.prepareToken(ct);
        this.handler.onDoctype(ct);
        this.preprocessor.dropParsedChunk();
    }
    _emitCurrentCharacterToken(nextLocation) {
        if (this.currentCharacterToken) {
            //NOTE: if we have a pending character token, make it's end location equal to the
            //current token's start location.
            if (nextLocation && this.currentCharacterToken.location) {
                this.currentCharacterToken.location.endLine = nextLocation.startLine;
                this.currentCharacterToken.location.endCol = nextLocation.startCol;
                this.currentCharacterToken.location.endOffset = nextLocation.startOffset;
            }
            switch (this.currentCharacterToken.type) {
                case TokenType.CHARACTER: {
                    this.handler.onCharacter(this.currentCharacterToken);
                    break;
                }
                case TokenType.NULL_CHARACTER: {
                    this.handler.onNullCharacter(this.currentCharacterToken);
                    break;
                }
                case TokenType.WHITESPACE_CHARACTER: {
                    this.handler.onWhitespaceCharacter(this.currentCharacterToken);
                    break;
                }
            }
            this.currentCharacterToken = null;
        }
    }
    _emitEOFToken() {
        const location = this.getCurrentLocation(0);
        if (location) {
            location.endLine = location.startLine;
            location.endCol = location.startCol;
            location.endOffset = location.startOffset;
        }
        this._emitCurrentCharacterToken(location);
        this.handler.onEof({ type: TokenType.EOF, location });
        this.active = false;
    }
    //Characters emission
    //OPTIMIZATION: The specification uses only one type of character token (one token per character).
    //This causes a huge memory overhead and a lot of unnecessary parser loops. parse5 uses 3 groups of characters.
    //If we have a sequence of characters that belong to the same group, the parser can process it
    //as a single solid character token.
    //So, there are 3 types of character tokens in parse5:
    //1)TokenType.NULL_CHARACTER - \u0000-character sequences (e.g. '\u0000\u0000\u0000')
    //2)TokenType.WHITESPACE_CHARACTER - any whitespace/new-line character sequences (e.g. '\n  \r\t   \f')
    //3)TokenType.CHARACTER - any character sequence which don't belong to groups 1 and 2 (e.g. 'abcdef1234@@#$%^')
    _appendCharToCurrentCharacterToken(type, ch) {
        if (this.currentCharacterToken) {
            if (this.currentCharacterToken.type === type) {
                this.currentCharacterToken.chars += ch;
                return;
            }
            else {
                this.currentLocation = this.getCurrentLocation(0);
                this._emitCurrentCharacterToken(this.currentLocation);
                this.preprocessor.dropParsedChunk();
            }
        }
        this._createCharacterToken(type, ch);
    }
    _emitCodePoint(cp) {
        const type = isWhitespace(cp)
            ? TokenType.WHITESPACE_CHARACTER
            : cp === $.NULL
                ? TokenType.NULL_CHARACTER
                : TokenType.CHARACTER;
        this._appendCharToCurrentCharacterToken(type, String.fromCodePoint(cp));
    }
    //NOTE: used when we emit characters explicitly.
    //This is always for non-whitespace and non-null characters, which allows us to avoid additional checks.
    _emitChars(ch) {
        this._appendCharToCurrentCharacterToken(TokenType.CHARACTER, ch);
    }
    // Character reference helpers
    _startCharacterReference() {
        this.returnState = this.state;
        this.state = State.CHARACTER_REFERENCE;
        this.entityStartPos = this.preprocessor.pos;
        this.entityDecoder.startEntity(this._isCharacterReferenceInAttribute() ? DecodingMode.Attribute : DecodingMode.Legacy);
    }
    _isCharacterReferenceInAttribute() {
        return (this.returnState === State.ATTRIBUTE_VALUE_DOUBLE_QUOTED ||
            this.returnState === State.ATTRIBUTE_VALUE_SINGLE_QUOTED ||
            this.returnState === State.ATTRIBUTE_VALUE_UNQUOTED);
    }
    _flushCodePointConsumedAsCharacterReference(cp) {
        if (this._isCharacterReferenceInAttribute()) {
            this.currentAttr.value += String.fromCodePoint(cp);
        }
        else {
            this._emitCodePoint(cp);
        }
    }
    // Calling states this way turns out to be much faster than any other approach.
    _callState(cp) {
        switch (this.state) {
            case State.DATA: {
                this._stateData(cp);
                break;
            }
            case State.RCDATA: {
                this._stateRcdata(cp);
                break;
            }
            case State.RAWTEXT: {
                this._stateRawtext(cp);
                break;
            }
            case State.SCRIPT_DATA: {
                this._stateScriptData(cp);
                break;
            }
            case State.PLAINTEXT: {
                this._statePlaintext(cp);
                break;
            }
            case State.TAG_OPEN: {
                this._stateTagOpen(cp);
                break;
            }
            case State.END_TAG_OPEN: {
                this._stateEndTagOpen(cp);
                break;
            }
            case State.TAG_NAME: {
                this._stateTagName(cp);
                break;
            }
            case State.RCDATA_LESS_THAN_SIGN: {
                this._stateRcdataLessThanSign(cp);
                break;
            }
            case State.RCDATA_END_TAG_OPEN: {
                this._stateRcdataEndTagOpen(cp);
                break;
            }
            case State.RCDATA_END_TAG_NAME: {
                this._stateRcdataEndTagName(cp);
                break;
            }
            case State.RAWTEXT_LESS_THAN_SIGN: {
                this._stateRawtextLessThanSign(cp);
                break;
            }
            case State.RAWTEXT_END_TAG_OPEN: {
                this._stateRawtextEndTagOpen(cp);
                break;
            }
            case State.RAWTEXT_END_TAG_NAME: {
                this._stateRawtextEndTagName(cp);
                break;
            }
            case State.SCRIPT_DATA_LESS_THAN_SIGN: {
                this._stateScriptDataLessThanSign(cp);
                break;
            }
            case State.SCRIPT_DATA_END_TAG_OPEN: {
                this._stateScriptDataEndTagOpen(cp);
                break;
            }
            case State.SCRIPT_DATA_END_TAG_NAME: {
                this._stateScriptDataEndTagName(cp);
                break;
            }
            case State.SCRIPT_DATA_ESCAPE_START: {
                this._stateScriptDataEscapeStart(cp);
                break;
            }
            case State.SCRIPT_DATA_ESCAPE_START_DASH: {
                this._stateScriptDataEscapeStartDash(cp);
                break;
            }
            case State.SCRIPT_DATA_ESCAPED: {
                this._stateScriptDataEscaped(cp);
                break;
            }
            case State.SCRIPT_DATA_ESCAPED_DASH: {
                this._stateScriptDataEscapedDash(cp);
                break;
            }
            case State.SCRIPT_DATA_ESCAPED_DASH_DASH: {
                this._stateScriptDataEscapedDashDash(cp);
                break;
            }
            case State.SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN: {
                this._stateScriptDataEscapedLessThanSign(cp);
                break;
            }
            case State.SCRIPT_DATA_ESCAPED_END_TAG_OPEN: {
                this._stateScriptDataEscapedEndTagOpen(cp);
                break;
            }
            case State.SCRIPT_DATA_ESCAPED_END_TAG_NAME: {
                this._stateScriptDataEscapedEndTagName(cp);
                break;
            }
            case State.SCRIPT_DATA_DOUBLE_ESCAPE_START: {
                this._stateScriptDataDoubleEscapeStart(cp);
                break;
            }
            case State.SCRIPT_DATA_DOUBLE_ESCAPED: {
                this._stateScriptDataDoubleEscaped(cp);
                break;
            }
            case State.SCRIPT_DATA_DOUBLE_ESCAPED_DASH: {
                this._stateScriptDataDoubleEscapedDash(cp);
                break;
            }
            case State.SCRIPT_DATA_DOUBLE_ESCAPED_DASH_DASH: {
                this._stateScriptDataDoubleEscapedDashDash(cp);
                break;
            }
            case State.SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN: {
                this._stateScriptDataDoubleEscapedLessThanSign(cp);
                break;
            }
            case State.SCRIPT_DATA_DOUBLE_ESCAPE_END: {
                this._stateScriptDataDoubleEscapeEnd(cp);
                break;
            }
            case State.BEFORE_ATTRIBUTE_NAME: {
                this._stateBeforeAttributeName(cp);
                break;
            }
            case State.ATTRIBUTE_NAME: {
                this._stateAttributeName(cp);
                break;
            }
            case State.AFTER_ATTRIBUTE_NAME: {
                this._stateAfterAttributeName(cp);
                break;
            }
            case State.BEFORE_ATTRIBUTE_VALUE: {
                this._stateBeforeAttributeValue(cp);
                break;
            }
            case State.ATTRIBUTE_VALUE_DOUBLE_QUOTED: {
                this._stateAttributeValueDoubleQuoted(cp);
                break;
            }
            case State.ATTRIBUTE_VALUE_SINGLE_QUOTED: {
                this._stateAttributeValueSingleQuoted(cp);
                break;
            }
            case State.ATTRIBUTE_VALUE_UNQUOTED: {
                this._stateAttributeValueUnquoted(cp);
                break;
            }
            case State.AFTER_ATTRIBUTE_VALUE_QUOTED: {
                this._stateAfterAttributeValueQuoted(cp);
                break;
            }
            case State.SELF_CLOSING_START_TAG: {
                this._stateSelfClosingStartTag(cp);
                break;
            }
            case State.BOGUS_COMMENT: {
                this._stateBogusComment(cp);
                break;
            }
            case State.MARKUP_DECLARATION_OPEN: {
                this._stateMarkupDeclarationOpen(cp);
                break;
            }
            case State.COMMENT_START: {
                this._stateCommentStart(cp);
                break;
            }
            case State.COMMENT_START_DASH: {
                this._stateCommentStartDash(cp);
                break;
            }
            case State.COMMENT: {
                this._stateComment(cp);
                break;
            }
            case State.COMMENT_LESS_THAN_SIGN: {
                this._stateCommentLessThanSign(cp);
                break;
            }
            case State.COMMENT_LESS_THAN_SIGN_BANG: {
                this._stateCommentLessThanSignBang(cp);
                break;
            }
            case State.COMMENT_LESS_THAN_SIGN_BANG_DASH: {
                this._stateCommentLessThanSignBangDash(cp);
                break;
            }
            case State.COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH: {
                this._stateCommentLessThanSignBangDashDash(cp);
                break;
            }
            case State.COMMENT_END_DASH: {
                this._stateCommentEndDash(cp);
                break;
            }
            case State.COMMENT_END: {
                this._stateCommentEnd(cp);
                break;
            }
            case State.COMMENT_END_BANG: {
                this._stateCommentEndBang(cp);
                break;
            }
            case State.DOCTYPE: {
                this._stateDoctype(cp);
                break;
            }
            case State.BEFORE_DOCTYPE_NAME: {
                this._stateBeforeDoctypeName(cp);
                break;
            }
            case State.DOCTYPE_NAME: {
                this._stateDoctypeName(cp);
                break;
            }
            case State.AFTER_DOCTYPE_NAME: {
                this._stateAfterDoctypeName(cp);
                break;
            }
            case State.AFTER_DOCTYPE_PUBLIC_KEYWORD: {
                this._stateAfterDoctypePublicKeyword(cp);
                break;
            }
            case State.BEFORE_DOCTYPE_PUBLIC_IDENTIFIER: {
                this._stateBeforeDoctypePublicIdentifier(cp);
                break;
            }
            case State.DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED: {
                this._stateDoctypePublicIdentifierDoubleQuoted(cp);
                break;
            }
            case State.DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED: {
                this._stateDoctypePublicIdentifierSingleQuoted(cp);
                break;
            }
            case State.AFTER_DOCTYPE_PUBLIC_IDENTIFIER: {
                this._stateAfterDoctypePublicIdentifier(cp);
                break;
            }
            case State.BETWEEN_DOCTYPE_PUBLIC_AND_SYSTEM_IDENTIFIERS: {
                this._stateBetweenDoctypePublicAndSystemIdentifiers(cp);
                break;
            }
            case State.AFTER_DOCTYPE_SYSTEM_KEYWORD: {
                this._stateAfterDoctypeSystemKeyword(cp);
                break;
            }
            case State.BEFORE_DOCTYPE_SYSTEM_IDENTIFIER: {
                this._stateBeforeDoctypeSystemIdentifier(cp);
                break;
            }
            case State.DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED: {
                this._stateDoctypeSystemIdentifierDoubleQuoted(cp);
                break;
            }
            case State.DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED: {
                this._stateDoctypeSystemIdentifierSingleQuoted(cp);
                break;
            }
            case State.AFTER_DOCTYPE_SYSTEM_IDENTIFIER: {
                this._stateAfterDoctypeSystemIdentifier(cp);
                break;
            }
            case State.BOGUS_DOCTYPE: {
                this._stateBogusDoctype(cp);
                break;
            }
            case State.CDATA_SECTION: {
                this._stateCdataSection(cp);
                break;
            }
            case State.CDATA_SECTION_BRACKET: {
                this._stateCdataSectionBracket(cp);
                break;
            }
            case State.CDATA_SECTION_END: {
                this._stateCdataSectionEnd(cp);
                break;
            }
            case State.CHARACTER_REFERENCE: {
                this._stateCharacterReference();
                break;
            }
            case State.AMBIGUOUS_AMPERSAND: {
                this._stateAmbiguousAmpersand(cp);
                break;
            }
            default: {
                throw new Error('Unknown state');
            }
        }
    }
    // State machine
    // Data state
    //------------------------------------------------------------------
    _stateData(cp) {
        switch (cp) {
            case $.LESS_THAN_SIGN: {
                this.state = State.TAG_OPEN;
                break;
            }
            case $.AMPERSAND: {
                this._startCharacterReference();
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this._emitCodePoint(cp);
                break;
            }
            case $.EOF: {
                this._emitEOFToken();
                break;
            }
            default: {
                this._emitCodePoint(cp);
            }
        }
    }
    //  RCDATA state
    //------------------------------------------------------------------
    _stateRcdata(cp) {
        switch (cp) {
            case $.AMPERSAND: {
                this._startCharacterReference();
                break;
            }
            case $.LESS_THAN_SIGN: {
                this.state = State.RCDATA_LESS_THAN_SIGN;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._emitEOFToken();
                break;
            }
            default: {
                this._emitCodePoint(cp);
            }
        }
    }
    // RAWTEXT state
    //------------------------------------------------------------------
    _stateRawtext(cp) {
        switch (cp) {
            case $.LESS_THAN_SIGN: {
                this.state = State.RAWTEXT_LESS_THAN_SIGN;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._emitEOFToken();
                break;
            }
            default: {
                this._emitCodePoint(cp);
            }
        }
    }
    // Script data state
    //------------------------------------------------------------------
    _stateScriptData(cp) {
        switch (cp) {
            case $.LESS_THAN_SIGN: {
                this.state = State.SCRIPT_DATA_LESS_THAN_SIGN;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._emitEOFToken();
                break;
            }
            default: {
                this._emitCodePoint(cp);
            }
        }
    }
    // PLAINTEXT state
    //------------------------------------------------------------------
    _statePlaintext(cp) {
        switch (cp) {
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._emitEOFToken();
                break;
            }
            default: {
                this._emitCodePoint(cp);
            }
        }
    }
    // Tag open state
    //------------------------------------------------------------------
    _stateTagOpen(cp) {
        if (isAsciiLetter(cp)) {
            this._createStartTagToken();
            this.state = State.TAG_NAME;
            this._stateTagName(cp);
        }
        else
            switch (cp) {
                case $.EXCLAMATION_MARK: {
                    this.state = State.MARKUP_DECLARATION_OPEN;
                    break;
                }
                case $.SOLIDUS: {
                    this.state = State.END_TAG_OPEN;
                    break;
                }
                case $.QUESTION_MARK: {
                    this._err(ERR.unexpectedQuestionMarkInsteadOfTagName);
                    this._createCommentToken(1);
                    this.state = State.BOGUS_COMMENT;
                    this._stateBogusComment(cp);
                    break;
                }
                case $.EOF: {
                    this._err(ERR.eofBeforeTagName);
                    this._emitChars('<');
                    this._emitEOFToken();
                    break;
                }
                default: {
                    this._err(ERR.invalidFirstCharacterOfTagName);
                    this._emitChars('<');
                    this.state = State.DATA;
                    this._stateData(cp);
                }
            }
    }
    // End tag open state
    //------------------------------------------------------------------
    _stateEndTagOpen(cp) {
        if (isAsciiLetter(cp)) {
            this._createEndTagToken();
            this.state = State.TAG_NAME;
            this._stateTagName(cp);
        }
        else
            switch (cp) {
                case $.GREATER_THAN_SIGN: {
                    this._err(ERR.missingEndTagName);
                    this.state = State.DATA;
                    break;
                }
                case $.EOF: {
                    this._err(ERR.eofBeforeTagName);
                    this._emitChars('</');
                    this._emitEOFToken();
                    break;
                }
                default: {
                    this._err(ERR.invalidFirstCharacterOfTagName);
                    this._createCommentToken(2);
                    this.state = State.BOGUS_COMMENT;
                    this._stateBogusComment(cp);
                }
            }
    }
    // Tag name state
    //------------------------------------------------------------------
    _stateTagName(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this.state = State.BEFORE_ATTRIBUTE_NAME;
                break;
            }
            case $.SOLIDUS: {
                this.state = State.SELF_CLOSING_START_TAG;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.state = State.DATA;
                this.emitCurrentTagToken();
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                token.tagName += REPLACEMENT_CHARACTER;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInTag);
                this._emitEOFToken();
                break;
            }
            default: {
                token.tagName += String.fromCodePoint(isAsciiUpper(cp) ? toAsciiLower(cp) : cp);
            }
        }
    }
    // RCDATA less-than sign state
    //------------------------------------------------------------------
    _stateRcdataLessThanSign(cp) {
        if (cp === $.SOLIDUS) {
            this.state = State.RCDATA_END_TAG_OPEN;
        }
        else {
            this._emitChars('<');
            this.state = State.RCDATA;
            this._stateRcdata(cp);
        }
    }
    // RCDATA end tag open state
    //------------------------------------------------------------------
    _stateRcdataEndTagOpen(cp) {
        if (isAsciiLetter(cp)) {
            this.state = State.RCDATA_END_TAG_NAME;
            this._stateRcdataEndTagName(cp);
        }
        else {
            this._emitChars('</');
            this.state = State.RCDATA;
            this._stateRcdata(cp);
        }
    }
    handleSpecialEndTag(_cp) {
        if (!this.preprocessor.startsWith(this.lastStartTagName, false)) {
            return !this._ensureHibernation();
        }
        this._createEndTagToken();
        const token = this.currentToken;
        token.tagName = this.lastStartTagName;
        const cp = this.preprocessor.peek(this.lastStartTagName.length);
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this._advanceBy(this.lastStartTagName.length);
                this.state = State.BEFORE_ATTRIBUTE_NAME;
                return false;
            }
            case $.SOLIDUS: {
                this._advanceBy(this.lastStartTagName.length);
                this.state = State.SELF_CLOSING_START_TAG;
                return false;
            }
            case $.GREATER_THAN_SIGN: {
                this._advanceBy(this.lastStartTagName.length);
                this.emitCurrentTagToken();
                this.state = State.DATA;
                return false;
            }
            default: {
                return !this._ensureHibernation();
            }
        }
    }
    // RCDATA end tag name state
    //------------------------------------------------------------------
    _stateRcdataEndTagName(cp) {
        if (this.handleSpecialEndTag(cp)) {
            this._emitChars('</');
            this.state = State.RCDATA;
            this._stateRcdata(cp);
        }
    }
    // RAWTEXT less-than sign state
    //------------------------------------------------------------------
    _stateRawtextLessThanSign(cp) {
        if (cp === $.SOLIDUS) {
            this.state = State.RAWTEXT_END_TAG_OPEN;
        }
        else {
            this._emitChars('<');
            this.state = State.RAWTEXT;
            this._stateRawtext(cp);
        }
    }
    // RAWTEXT end tag open state
    //------------------------------------------------------------------
    _stateRawtextEndTagOpen(cp) {
        if (isAsciiLetter(cp)) {
            this.state = State.RAWTEXT_END_TAG_NAME;
            this._stateRawtextEndTagName(cp);
        }
        else {
            this._emitChars('</');
            this.state = State.RAWTEXT;
            this._stateRawtext(cp);
        }
    }
    // RAWTEXT end tag name state
    //------------------------------------------------------------------
    _stateRawtextEndTagName(cp) {
        if (this.handleSpecialEndTag(cp)) {
            this._emitChars('</');
            this.state = State.RAWTEXT;
            this._stateRawtext(cp);
        }
    }
    // Script data less-than sign state
    //------------------------------------------------------------------
    _stateScriptDataLessThanSign(cp) {
        switch (cp) {
            case $.SOLIDUS: {
                this.state = State.SCRIPT_DATA_END_TAG_OPEN;
                break;
            }
            case $.EXCLAMATION_MARK: {
                this.state = State.SCRIPT_DATA_ESCAPE_START;
                this._emitChars('<!');
                break;
            }
            default: {
                this._emitChars('<');
                this.state = State.SCRIPT_DATA;
                this._stateScriptData(cp);
            }
        }
    }
    // Script data end tag open state
    //------------------------------------------------------------------
    _stateScriptDataEndTagOpen(cp) {
        if (isAsciiLetter(cp)) {
            this.state = State.SCRIPT_DATA_END_TAG_NAME;
            this._stateScriptDataEndTagName(cp);
        }
        else {
            this._emitChars('</');
            this.state = State.SCRIPT_DATA;
            this._stateScriptData(cp);
        }
    }
    // Script data end tag name state
    //------------------------------------------------------------------
    _stateScriptDataEndTagName(cp) {
        if (this.handleSpecialEndTag(cp)) {
            this._emitChars('</');
            this.state = State.SCRIPT_DATA;
            this._stateScriptData(cp);
        }
    }
    // Script data escape start state
    //------------------------------------------------------------------
    _stateScriptDataEscapeStart(cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = State.SCRIPT_DATA_ESCAPE_START_DASH;
            this._emitChars('-');
        }
        else {
            this.state = State.SCRIPT_DATA;
            this._stateScriptData(cp);
        }
    }
    // Script data escape start dash state
    //------------------------------------------------------------------
    _stateScriptDataEscapeStartDash(cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = State.SCRIPT_DATA_ESCAPED_DASH_DASH;
            this._emitChars('-');
        }
        else {
            this.state = State.SCRIPT_DATA;
            this._stateScriptData(cp);
        }
    }
    // Script data escaped state
    //------------------------------------------------------------------
    _stateScriptDataEscaped(cp) {
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this.state = State.SCRIPT_DATA_ESCAPED_DASH;
                this._emitChars('-');
                break;
            }
            case $.LESS_THAN_SIGN: {
                this.state = State.SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInScriptHtmlCommentLikeText);
                this._emitEOFToken();
                break;
            }
            default: {
                this._emitCodePoint(cp);
            }
        }
    }
    // Script data escaped dash state
    //------------------------------------------------------------------
    _stateScriptDataEscapedDash(cp) {
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this.state = State.SCRIPT_DATA_ESCAPED_DASH_DASH;
                this._emitChars('-');
                break;
            }
            case $.LESS_THAN_SIGN: {
                this.state = State.SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this.state = State.SCRIPT_DATA_ESCAPED;
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInScriptHtmlCommentLikeText);
                this._emitEOFToken();
                break;
            }
            default: {
                this.state = State.SCRIPT_DATA_ESCAPED;
                this._emitCodePoint(cp);
            }
        }
    }
    // Script data escaped dash dash state
    //------------------------------------------------------------------
    _stateScriptDataEscapedDashDash(cp) {
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this._emitChars('-');
                break;
            }
            case $.LESS_THAN_SIGN: {
                this.state = State.SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.state = State.SCRIPT_DATA;
                this._emitChars('>');
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this.state = State.SCRIPT_DATA_ESCAPED;
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInScriptHtmlCommentLikeText);
                this._emitEOFToken();
                break;
            }
            default: {
                this.state = State.SCRIPT_DATA_ESCAPED;
                this._emitCodePoint(cp);
            }
        }
    }
    // Script data escaped less-than sign state
    //------------------------------------------------------------------
    _stateScriptDataEscapedLessThanSign(cp) {
        if (cp === $.SOLIDUS) {
            this.state = State.SCRIPT_DATA_ESCAPED_END_TAG_OPEN;
        }
        else if (isAsciiLetter(cp)) {
            this._emitChars('<');
            this.state = State.SCRIPT_DATA_DOUBLE_ESCAPE_START;
            this._stateScriptDataDoubleEscapeStart(cp);
        }
        else {
            this._emitChars('<');
            this.state = State.SCRIPT_DATA_ESCAPED;
            this._stateScriptDataEscaped(cp);
        }
    }
    // Script data escaped end tag open state
    //------------------------------------------------------------------
    _stateScriptDataEscapedEndTagOpen(cp) {
        if (isAsciiLetter(cp)) {
            this.state = State.SCRIPT_DATA_ESCAPED_END_TAG_NAME;
            this._stateScriptDataEscapedEndTagName(cp);
        }
        else {
            this._emitChars('</');
            this.state = State.SCRIPT_DATA_ESCAPED;
            this._stateScriptDataEscaped(cp);
        }
    }
    // Script data escaped end tag name state
    //------------------------------------------------------------------
    _stateScriptDataEscapedEndTagName(cp) {
        if (this.handleSpecialEndTag(cp)) {
            this._emitChars('</');
            this.state = State.SCRIPT_DATA_ESCAPED;
            this._stateScriptDataEscaped(cp);
        }
    }
    // Script data double escape start state
    //------------------------------------------------------------------
    _stateScriptDataDoubleEscapeStart(cp) {
        if (this.preprocessor.startsWith($$.SCRIPT, false) &&
            isScriptDataDoubleEscapeSequenceEnd(this.preprocessor.peek($$.SCRIPT.length))) {
            this._emitCodePoint(cp);
            for (let i = 0; i < $$.SCRIPT.length; i++) {
                this._emitCodePoint(this._consume());
            }
            this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED;
        }
        else if (!this._ensureHibernation()) {
            this.state = State.SCRIPT_DATA_ESCAPED;
            this._stateScriptDataEscaped(cp);
        }
    }
    // Script data double escaped state
    //------------------------------------------------------------------
    _stateScriptDataDoubleEscaped(cp) {
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED_DASH;
                this._emitChars('-');
                break;
            }
            case $.LESS_THAN_SIGN: {
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN;
                this._emitChars('<');
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInScriptHtmlCommentLikeText);
                this._emitEOFToken();
                break;
            }
            default: {
                this._emitCodePoint(cp);
            }
        }
    }
    // Script data double escaped dash state
    //------------------------------------------------------------------
    _stateScriptDataDoubleEscapedDash(cp) {
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED_DASH_DASH;
                this._emitChars('-');
                break;
            }
            case $.LESS_THAN_SIGN: {
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN;
                this._emitChars('<');
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED;
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInScriptHtmlCommentLikeText);
                this._emitEOFToken();
                break;
            }
            default: {
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED;
                this._emitCodePoint(cp);
            }
        }
    }
    // Script data double escaped dash dash state
    //------------------------------------------------------------------
    _stateScriptDataDoubleEscapedDashDash(cp) {
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this._emitChars('-');
                break;
            }
            case $.LESS_THAN_SIGN: {
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN;
                this._emitChars('<');
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.state = State.SCRIPT_DATA;
                this._emitChars('>');
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED;
                this._emitChars(REPLACEMENT_CHARACTER);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInScriptHtmlCommentLikeText);
                this._emitEOFToken();
                break;
            }
            default: {
                this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED;
                this._emitCodePoint(cp);
            }
        }
    }
    // Script data double escaped less-than sign state
    //------------------------------------------------------------------
    _stateScriptDataDoubleEscapedLessThanSign(cp) {
        if (cp === $.SOLIDUS) {
            this.state = State.SCRIPT_DATA_DOUBLE_ESCAPE_END;
            this._emitChars('/');
        }
        else {
            this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED;
            this._stateScriptDataDoubleEscaped(cp);
        }
    }
    // Script data double escape end state
    //------------------------------------------------------------------
    _stateScriptDataDoubleEscapeEnd(cp) {
        if (this.preprocessor.startsWith($$.SCRIPT, false) &&
            isScriptDataDoubleEscapeSequenceEnd(this.preprocessor.peek($$.SCRIPT.length))) {
            this._emitCodePoint(cp);
            for (let i = 0; i < $$.SCRIPT.length; i++) {
                this._emitCodePoint(this._consume());
            }
            this.state = State.SCRIPT_DATA_ESCAPED;
        }
        else if (!this._ensureHibernation()) {
            this.state = State.SCRIPT_DATA_DOUBLE_ESCAPED;
            this._stateScriptDataDoubleEscaped(cp);
        }
    }
    // Before attribute name state
    //------------------------------------------------------------------
    _stateBeforeAttributeName(cp) {
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                // Ignore whitespace
                break;
            }
            case $.SOLIDUS:
            case $.GREATER_THAN_SIGN:
            case $.EOF: {
                this.state = State.AFTER_ATTRIBUTE_NAME;
                this._stateAfterAttributeName(cp);
                break;
            }
            case $.EQUALS_SIGN: {
                this._err(ERR.unexpectedEqualsSignBeforeAttributeName);
                this._createAttr('=');
                this.state = State.ATTRIBUTE_NAME;
                break;
            }
            default: {
                this._createAttr('');
                this.state = State.ATTRIBUTE_NAME;
                this._stateAttributeName(cp);
            }
        }
    }
    // Attribute name state
    //------------------------------------------------------------------
    _stateAttributeName(cp) {
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED:
            case $.SOLIDUS:
            case $.GREATER_THAN_SIGN:
            case $.EOF: {
                this._leaveAttrName();
                this.state = State.AFTER_ATTRIBUTE_NAME;
                this._stateAfterAttributeName(cp);
                break;
            }
            case $.EQUALS_SIGN: {
                this._leaveAttrName();
                this.state = State.BEFORE_ATTRIBUTE_VALUE;
                break;
            }
            case $.QUOTATION_MARK:
            case $.APOSTROPHE:
            case $.LESS_THAN_SIGN: {
                this._err(ERR.unexpectedCharacterInAttributeName);
                this.currentAttr.name += String.fromCodePoint(cp);
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this.currentAttr.name += REPLACEMENT_CHARACTER;
                break;
            }
            default: {
                this.currentAttr.name += String.fromCodePoint(isAsciiUpper(cp) ? toAsciiLower(cp) : cp);
            }
        }
    }
    // After attribute name state
    //------------------------------------------------------------------
    _stateAfterAttributeName(cp) {
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                // Ignore whitespace
                break;
            }
            case $.SOLIDUS: {
                this.state = State.SELF_CLOSING_START_TAG;
                break;
            }
            case $.EQUALS_SIGN: {
                this.state = State.BEFORE_ATTRIBUTE_VALUE;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.state = State.DATA;
                this.emitCurrentTagToken();
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInTag);
                this._emitEOFToken();
                break;
            }
            default: {
                this._createAttr('');
                this.state = State.ATTRIBUTE_NAME;
                this._stateAttributeName(cp);
            }
        }
    }
    // Before attribute value state
    //------------------------------------------------------------------
    _stateBeforeAttributeValue(cp) {
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                // Ignore whitespace
                break;
            }
            case $.QUOTATION_MARK: {
                this.state = State.ATTRIBUTE_VALUE_DOUBLE_QUOTED;
                break;
            }
            case $.APOSTROPHE: {
                this.state = State.ATTRIBUTE_VALUE_SINGLE_QUOTED;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.missingAttributeValue);
                this.state = State.DATA;
                this.emitCurrentTagToken();
                break;
            }
            default: {
                this.state = State.ATTRIBUTE_VALUE_UNQUOTED;
                this._stateAttributeValueUnquoted(cp);
            }
        }
    }
    // Attribute value (double-quoted) state
    //------------------------------------------------------------------
    _stateAttributeValueDoubleQuoted(cp) {
        switch (cp) {
            case $.QUOTATION_MARK: {
                this.state = State.AFTER_ATTRIBUTE_VALUE_QUOTED;
                break;
            }
            case $.AMPERSAND: {
                this._startCharacterReference();
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this.currentAttr.value += REPLACEMENT_CHARACTER;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInTag);
                this._emitEOFToken();
                break;
            }
            default: {
                this.currentAttr.value += String.fromCodePoint(cp);
            }
        }
    }
    // Attribute value (single-quoted) state
    //------------------------------------------------------------------
    _stateAttributeValueSingleQuoted(cp) {
        switch (cp) {
            case $.APOSTROPHE: {
                this.state = State.AFTER_ATTRIBUTE_VALUE_QUOTED;
                break;
            }
            case $.AMPERSAND: {
                this._startCharacterReference();
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this.currentAttr.value += REPLACEMENT_CHARACTER;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInTag);
                this._emitEOFToken();
                break;
            }
            default: {
                this.currentAttr.value += String.fromCodePoint(cp);
            }
        }
    }
    // Attribute value (unquoted) state
    //------------------------------------------------------------------
    _stateAttributeValueUnquoted(cp) {
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this._leaveAttrValue();
                this.state = State.BEFORE_ATTRIBUTE_NAME;
                break;
            }
            case $.AMPERSAND: {
                this._startCharacterReference();
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._leaveAttrValue();
                this.state = State.DATA;
                this.emitCurrentTagToken();
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                this.currentAttr.value += REPLACEMENT_CHARACTER;
                break;
            }
            case $.QUOTATION_MARK:
            case $.APOSTROPHE:
            case $.LESS_THAN_SIGN:
            case $.EQUALS_SIGN:
            case $.GRAVE_ACCENT: {
                this._err(ERR.unexpectedCharacterInUnquotedAttributeValue);
                this.currentAttr.value += String.fromCodePoint(cp);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInTag);
                this._emitEOFToken();
                break;
            }
            default: {
                this.currentAttr.value += String.fromCodePoint(cp);
            }
        }
    }
    // After attribute value (quoted) state
    //------------------------------------------------------------------
    _stateAfterAttributeValueQuoted(cp) {
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this._leaveAttrValue();
                this.state = State.BEFORE_ATTRIBUTE_NAME;
                break;
            }
            case $.SOLIDUS: {
                this._leaveAttrValue();
                this.state = State.SELF_CLOSING_START_TAG;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._leaveAttrValue();
                this.state = State.DATA;
                this.emitCurrentTagToken();
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInTag);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.missingWhitespaceBetweenAttributes);
                this.state = State.BEFORE_ATTRIBUTE_NAME;
                this._stateBeforeAttributeName(cp);
            }
        }
    }
    // Self-closing start tag state
    //------------------------------------------------------------------
    _stateSelfClosingStartTag(cp) {
        switch (cp) {
            case $.GREATER_THAN_SIGN: {
                const token = this.currentToken;
                token.selfClosing = true;
                this.state = State.DATA;
                this.emitCurrentTagToken();
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInTag);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.unexpectedSolidusInTag);
                this.state = State.BEFORE_ATTRIBUTE_NAME;
                this._stateBeforeAttributeName(cp);
            }
        }
    }
    // Bogus comment state
    //------------------------------------------------------------------
    _stateBogusComment(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.GREATER_THAN_SIGN: {
                this.state = State.DATA;
                this.emitCurrentComment(token);
                break;
            }
            case $.EOF: {
                this.emitCurrentComment(token);
                this._emitEOFToken();
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                token.data += REPLACEMENT_CHARACTER;
                break;
            }
            default: {
                token.data += String.fromCodePoint(cp);
            }
        }
    }
    // Markup declaration open state
    //------------------------------------------------------------------
    _stateMarkupDeclarationOpen(cp) {
        if (this._consumeSequenceIfMatch($$.DASH_DASH, true)) {
            this._createCommentToken($$.DASH_DASH.length + 1);
            this.state = State.COMMENT_START;
        }
        else if (this._consumeSequenceIfMatch($$.DOCTYPE, false)) {
            // NOTE: Doctypes tokens are created without fixed offsets. We keep track of the moment a doctype *might* start here.
            this.currentLocation = this.getCurrentLocation($$.DOCTYPE.length + 1);
            this.state = State.DOCTYPE;
        }
        else if (this._consumeSequenceIfMatch($$.CDATA_START, true)) {
            if (this.inForeignNode) {
                this.state = State.CDATA_SECTION;
            }
            else {
                this._err(ERR.cdataInHtmlContent);
                this._createCommentToken($$.CDATA_START.length + 1);
                this.currentToken.data = '[CDATA[';
                this.state = State.BOGUS_COMMENT;
            }
        }
        //NOTE: Sequence lookups can be abrupted by hibernation. In that case, lookup
        //results are no longer valid and we will need to start over.
        else if (!this._ensureHibernation()) {
            this._err(ERR.incorrectlyOpenedComment);
            this._createCommentToken(2);
            this.state = State.BOGUS_COMMENT;
            this._stateBogusComment(cp);
        }
    }
    // Comment start state
    //------------------------------------------------------------------
    _stateCommentStart(cp) {
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this.state = State.COMMENT_START_DASH;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.abruptClosingOfEmptyComment);
                this.state = State.DATA;
                const token = this.currentToken;
                this.emitCurrentComment(token);
                break;
            }
            default: {
                this.state = State.COMMENT;
                this._stateComment(cp);
            }
        }
    }
    // Comment start dash state
    //------------------------------------------------------------------
    _stateCommentStartDash(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this.state = State.COMMENT_END;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.abruptClosingOfEmptyComment);
                this.state = State.DATA;
                this.emitCurrentComment(token);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInComment);
                this.emitCurrentComment(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.data += '-';
                this.state = State.COMMENT;
                this._stateComment(cp);
            }
        }
    }
    // Comment state
    //------------------------------------------------------------------
    _stateComment(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this.state = State.COMMENT_END_DASH;
                break;
            }
            case $.LESS_THAN_SIGN: {
                token.data += '<';
                this.state = State.COMMENT_LESS_THAN_SIGN;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                token.data += REPLACEMENT_CHARACTER;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInComment);
                this.emitCurrentComment(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.data += String.fromCodePoint(cp);
            }
        }
    }
    // Comment less-than sign state
    //------------------------------------------------------------------
    _stateCommentLessThanSign(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.EXCLAMATION_MARK: {
                token.data += '!';
                this.state = State.COMMENT_LESS_THAN_SIGN_BANG;
                break;
            }
            case $.LESS_THAN_SIGN: {
                token.data += '<';
                break;
            }
            default: {
                this.state = State.COMMENT;
                this._stateComment(cp);
            }
        }
    }
    // Comment less-than sign bang state
    //------------------------------------------------------------------
    _stateCommentLessThanSignBang(cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = State.COMMENT_LESS_THAN_SIGN_BANG_DASH;
        }
        else {
            this.state = State.COMMENT;
            this._stateComment(cp);
        }
    }
    // Comment less-than sign bang dash state
    //------------------------------------------------------------------
    _stateCommentLessThanSignBangDash(cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = State.COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH;
        }
        else {
            this.state = State.COMMENT_END_DASH;
            this._stateCommentEndDash(cp);
        }
    }
    // Comment less-than sign bang dash dash state
    //------------------------------------------------------------------
    _stateCommentLessThanSignBangDashDash(cp) {
        if (cp !== $.GREATER_THAN_SIGN && cp !== $.EOF) {
            this._err(ERR.nestedComment);
        }
        this.state = State.COMMENT_END;
        this._stateCommentEnd(cp);
    }
    // Comment end dash state
    //------------------------------------------------------------------
    _stateCommentEndDash(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.HYPHEN_MINUS: {
                this.state = State.COMMENT_END;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInComment);
                this.emitCurrentComment(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.data += '-';
                this.state = State.COMMENT;
                this._stateComment(cp);
            }
        }
    }
    // Comment end state
    //------------------------------------------------------------------
    _stateCommentEnd(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.GREATER_THAN_SIGN: {
                this.state = State.DATA;
                this.emitCurrentComment(token);
                break;
            }
            case $.EXCLAMATION_MARK: {
                this.state = State.COMMENT_END_BANG;
                break;
            }
            case $.HYPHEN_MINUS: {
                token.data += '-';
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInComment);
                this.emitCurrentComment(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.data += '--';
                this.state = State.COMMENT;
                this._stateComment(cp);
            }
        }
    }
    // Comment end bang state
    //------------------------------------------------------------------
    _stateCommentEndBang(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.HYPHEN_MINUS: {
                token.data += '--!';
                this.state = State.COMMENT_END_DASH;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.incorrectlyClosedComment);
                this.state = State.DATA;
                this.emitCurrentComment(token);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInComment);
                this.emitCurrentComment(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.data += '--!';
                this.state = State.COMMENT;
                this._stateComment(cp);
            }
        }
    }
    // DOCTYPE state
    //------------------------------------------------------------------
    _stateDoctype(cp) {
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this.state = State.BEFORE_DOCTYPE_NAME;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.state = State.BEFORE_DOCTYPE_NAME;
                this._stateBeforeDoctypeName(cp);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                this._createDoctypeToken(null);
                const token = this.currentToken;
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.missingWhitespaceBeforeDoctypeName);
                this.state = State.BEFORE_DOCTYPE_NAME;
                this._stateBeforeDoctypeName(cp);
            }
        }
    }
    // Before DOCTYPE name state
    //------------------------------------------------------------------
    _stateBeforeDoctypeName(cp) {
        if (isAsciiUpper(cp)) {
            this._createDoctypeToken(String.fromCharCode(toAsciiLower(cp)));
            this.state = State.DOCTYPE_NAME;
        }
        else
            switch (cp) {
                case $.SPACE:
                case $.LINE_FEED:
                case $.TABULATION:
                case $.FORM_FEED: {
                    // Ignore whitespace
                    break;
                }
                case $.NULL: {
                    this._err(ERR.unexpectedNullCharacter);
                    this._createDoctypeToken(REPLACEMENT_CHARACTER);
                    this.state = State.DOCTYPE_NAME;
                    break;
                }
                case $.GREATER_THAN_SIGN: {
                    this._err(ERR.missingDoctypeName);
                    this._createDoctypeToken(null);
                    const token = this.currentToken;
                    token.forceQuirks = true;
                    this.emitCurrentDoctype(token);
                    this.state = State.DATA;
                    break;
                }
                case $.EOF: {
                    this._err(ERR.eofInDoctype);
                    this._createDoctypeToken(null);
                    const token = this.currentToken;
                    token.forceQuirks = true;
                    this.emitCurrentDoctype(token);
                    this._emitEOFToken();
                    break;
                }
                default: {
                    this._createDoctypeToken(String.fromCodePoint(cp));
                    this.state = State.DOCTYPE_NAME;
                }
            }
    }
    // DOCTYPE name state
    //------------------------------------------------------------------
    _stateDoctypeName(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this.state = State.AFTER_DOCTYPE_NAME;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.state = State.DATA;
                this.emitCurrentDoctype(token);
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                token.name += REPLACEMENT_CHARACTER;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.name += String.fromCodePoint(isAsciiUpper(cp) ? toAsciiLower(cp) : cp);
            }
        }
    }
    // After DOCTYPE name state
    //------------------------------------------------------------------
    _stateAfterDoctypeName(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                // Ignore whitespace
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.state = State.DATA;
                this.emitCurrentDoctype(token);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                if (this._consumeSequenceIfMatch($$.PUBLIC, false)) {
                    this.state = State.AFTER_DOCTYPE_PUBLIC_KEYWORD;
                }
                else if (this._consumeSequenceIfMatch($$.SYSTEM, false)) {
                    this.state = State.AFTER_DOCTYPE_SYSTEM_KEYWORD;
                }
                //NOTE: sequence lookup can be abrupted by hibernation. In that case lookup
                //results are no longer valid and we will need to start over.
                else if (!this._ensureHibernation()) {
                    this._err(ERR.invalidCharacterSequenceAfterDoctypeName);
                    token.forceQuirks = true;
                    this.state = State.BOGUS_DOCTYPE;
                    this._stateBogusDoctype(cp);
                }
            }
        }
    }
    // After DOCTYPE public keyword state
    //------------------------------------------------------------------
    _stateAfterDoctypePublicKeyword(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this.state = State.BEFORE_DOCTYPE_PUBLIC_IDENTIFIER;
                break;
            }
            case $.QUOTATION_MARK: {
                this._err(ERR.missingWhitespaceAfterDoctypePublicKeyword);
                token.publicId = '';
                this.state = State.DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED;
                break;
            }
            case $.APOSTROPHE: {
                this._err(ERR.missingWhitespaceAfterDoctypePublicKeyword);
                token.publicId = '';
                this.state = State.DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.missingDoctypePublicIdentifier);
                token.forceQuirks = true;
                this.state = State.DATA;
                this.emitCurrentDoctype(token);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.missingQuoteBeforeDoctypePublicIdentifier);
                token.forceQuirks = true;
                this.state = State.BOGUS_DOCTYPE;
                this._stateBogusDoctype(cp);
            }
        }
    }
    // Before DOCTYPE public identifier state
    //------------------------------------------------------------------
    _stateBeforeDoctypePublicIdentifier(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                // Ignore whitespace
                break;
            }
            case $.QUOTATION_MARK: {
                token.publicId = '';
                this.state = State.DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED;
                break;
            }
            case $.APOSTROPHE: {
                token.publicId = '';
                this.state = State.DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.missingDoctypePublicIdentifier);
                token.forceQuirks = true;
                this.state = State.DATA;
                this.emitCurrentDoctype(token);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.missingQuoteBeforeDoctypePublicIdentifier);
                token.forceQuirks = true;
                this.state = State.BOGUS_DOCTYPE;
                this._stateBogusDoctype(cp);
            }
        }
    }
    // DOCTYPE public identifier (double-quoted) state
    //------------------------------------------------------------------
    _stateDoctypePublicIdentifierDoubleQuoted(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.QUOTATION_MARK: {
                this.state = State.AFTER_DOCTYPE_PUBLIC_IDENTIFIER;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                token.publicId += REPLACEMENT_CHARACTER;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.abruptDoctypePublicIdentifier);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this.state = State.DATA;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.publicId += String.fromCodePoint(cp);
            }
        }
    }
    // DOCTYPE public identifier (single-quoted) state
    //------------------------------------------------------------------
    _stateDoctypePublicIdentifierSingleQuoted(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.APOSTROPHE: {
                this.state = State.AFTER_DOCTYPE_PUBLIC_IDENTIFIER;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                token.publicId += REPLACEMENT_CHARACTER;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.abruptDoctypePublicIdentifier);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this.state = State.DATA;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.publicId += String.fromCodePoint(cp);
            }
        }
    }
    // After DOCTYPE public identifier state
    //------------------------------------------------------------------
    _stateAfterDoctypePublicIdentifier(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this.state = State.BETWEEN_DOCTYPE_PUBLIC_AND_SYSTEM_IDENTIFIERS;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.state = State.DATA;
                this.emitCurrentDoctype(token);
                break;
            }
            case $.QUOTATION_MARK: {
                this._err(ERR.missingWhitespaceBetweenDoctypePublicAndSystemIdentifiers);
                token.systemId = '';
                this.state = State.DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED;
                break;
            }
            case $.APOSTROPHE: {
                this._err(ERR.missingWhitespaceBetweenDoctypePublicAndSystemIdentifiers);
                token.systemId = '';
                this.state = State.DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.missingQuoteBeforeDoctypeSystemIdentifier);
                token.forceQuirks = true;
                this.state = State.BOGUS_DOCTYPE;
                this._stateBogusDoctype(cp);
            }
        }
    }
    // Between DOCTYPE public and system identifiers state
    //------------------------------------------------------------------
    _stateBetweenDoctypePublicAndSystemIdentifiers(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                // Ignore whitespace
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.emitCurrentDoctype(token);
                this.state = State.DATA;
                break;
            }
            case $.QUOTATION_MARK: {
                token.systemId = '';
                this.state = State.DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED;
                break;
            }
            case $.APOSTROPHE: {
                token.systemId = '';
                this.state = State.DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.missingQuoteBeforeDoctypeSystemIdentifier);
                token.forceQuirks = true;
                this.state = State.BOGUS_DOCTYPE;
                this._stateBogusDoctype(cp);
            }
        }
    }
    // After DOCTYPE system keyword state
    //------------------------------------------------------------------
    _stateAfterDoctypeSystemKeyword(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                this.state = State.BEFORE_DOCTYPE_SYSTEM_IDENTIFIER;
                break;
            }
            case $.QUOTATION_MARK: {
                this._err(ERR.missingWhitespaceAfterDoctypeSystemKeyword);
                token.systemId = '';
                this.state = State.DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED;
                break;
            }
            case $.APOSTROPHE: {
                this._err(ERR.missingWhitespaceAfterDoctypeSystemKeyword);
                token.systemId = '';
                this.state = State.DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.missingDoctypeSystemIdentifier);
                token.forceQuirks = true;
                this.state = State.DATA;
                this.emitCurrentDoctype(token);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.missingQuoteBeforeDoctypeSystemIdentifier);
                token.forceQuirks = true;
                this.state = State.BOGUS_DOCTYPE;
                this._stateBogusDoctype(cp);
            }
        }
    }
    // Before DOCTYPE system identifier state
    //------------------------------------------------------------------
    _stateBeforeDoctypeSystemIdentifier(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                // Ignore whitespace
                break;
            }
            case $.QUOTATION_MARK: {
                token.systemId = '';
                this.state = State.DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED;
                break;
            }
            case $.APOSTROPHE: {
                token.systemId = '';
                this.state = State.DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.missingDoctypeSystemIdentifier);
                token.forceQuirks = true;
                this.state = State.DATA;
                this.emitCurrentDoctype(token);
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.missingQuoteBeforeDoctypeSystemIdentifier);
                token.forceQuirks = true;
                this.state = State.BOGUS_DOCTYPE;
                this._stateBogusDoctype(cp);
            }
        }
    }
    // DOCTYPE system identifier (double-quoted) state
    //------------------------------------------------------------------
    _stateDoctypeSystemIdentifierDoubleQuoted(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.QUOTATION_MARK: {
                this.state = State.AFTER_DOCTYPE_SYSTEM_IDENTIFIER;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                token.systemId += REPLACEMENT_CHARACTER;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.abruptDoctypeSystemIdentifier);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this.state = State.DATA;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.systemId += String.fromCodePoint(cp);
            }
        }
    }
    // DOCTYPE system identifier (single-quoted) state
    //------------------------------------------------------------------
    _stateDoctypeSystemIdentifierSingleQuoted(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.APOSTROPHE: {
                this.state = State.AFTER_DOCTYPE_SYSTEM_IDENTIFIER;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                token.systemId += REPLACEMENT_CHARACTER;
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this._err(ERR.abruptDoctypeSystemIdentifier);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this.state = State.DATA;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                token.systemId += String.fromCodePoint(cp);
            }
        }
    }
    // After DOCTYPE system identifier state
    //------------------------------------------------------------------
    _stateAfterDoctypeSystemIdentifier(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.SPACE:
            case $.LINE_FEED:
            case $.TABULATION:
            case $.FORM_FEED: {
                // Ignore whitespace
                break;
            }
            case $.GREATER_THAN_SIGN: {
                this.emitCurrentDoctype(token);
                this.state = State.DATA;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInDoctype);
                token.forceQuirks = true;
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default: {
                this._err(ERR.unexpectedCharacterAfterDoctypeSystemIdentifier);
                this.state = State.BOGUS_DOCTYPE;
                this._stateBogusDoctype(cp);
            }
        }
    }
    // Bogus DOCTYPE state
    //------------------------------------------------------------------
    _stateBogusDoctype(cp) {
        const token = this.currentToken;
        switch (cp) {
            case $.GREATER_THAN_SIGN: {
                this.emitCurrentDoctype(token);
                this.state = State.DATA;
                break;
            }
            case $.NULL: {
                this._err(ERR.unexpectedNullCharacter);
                break;
            }
            case $.EOF: {
                this.emitCurrentDoctype(token);
                this._emitEOFToken();
                break;
            }
            default:
            // Do nothing
        }
    }
    // CDATA section state
    //------------------------------------------------------------------
    _stateCdataSection(cp) {
        switch (cp) {
            case $.RIGHT_SQUARE_BRACKET: {
                this.state = State.CDATA_SECTION_BRACKET;
                break;
            }
            case $.EOF: {
                this._err(ERR.eofInCdata);
                this._emitEOFToken();
                break;
            }
            default: {
                this._emitCodePoint(cp);
            }
        }
    }
    // CDATA section bracket state
    //------------------------------------------------------------------
    _stateCdataSectionBracket(cp) {
        if (cp === $.RIGHT_SQUARE_BRACKET) {
            this.state = State.CDATA_SECTION_END;
        }
        else {
            this._emitChars(']');
            this.state = State.CDATA_SECTION;
            this._stateCdataSection(cp);
        }
    }
    // CDATA section end state
    //------------------------------------------------------------------
    _stateCdataSectionEnd(cp) {
        switch (cp) {
            case $.GREATER_THAN_SIGN: {
                this.state = State.DATA;
                break;
            }
            case $.RIGHT_SQUARE_BRACKET: {
                this._emitChars(']');
                break;
            }
            default: {
                this._emitChars(']]');
                this.state = State.CDATA_SECTION;
                this._stateCdataSection(cp);
            }
        }
    }
    // Character reference state
    //------------------------------------------------------------------
    _stateCharacterReference() {
        let length = this.entityDecoder.write(this.preprocessor.html, this.preprocessor.pos);
        if (length < 0) {
            if (this.preprocessor.lastChunkWritten) {
                length = this.entityDecoder.end();
            }
            else {
                // Wait for the rest of the entity.
                this.active = false;
                // Mark the entire buffer as read.
                this.preprocessor.pos = this.preprocessor.html.length - 1;
                this.consumedAfterSnapshot = 0;
                this.preprocessor.endOfChunkHit = true;
                return;
            }
        }
        if (length === 0) {
            // This was not a valid entity. Go back to the beginning, and
            // figure out what to do.
            this.preprocessor.pos = this.entityStartPos;
            this._flushCodePointConsumedAsCharacterReference($.AMPERSAND);
            this.state =
                !this._isCharacterReferenceInAttribute() && isAsciiAlphaNumeric(this.preprocessor.peek(1))
                    ? State.AMBIGUOUS_AMPERSAND
                    : this.returnState;
        }
        else {
            // We successfully parsed an entity. Switch to the return state.
            this.state = this.returnState;
        }
    }
    // Ambiguos ampersand state
    //------------------------------------------------------------------
    _stateAmbiguousAmpersand(cp) {
        if (isAsciiAlphaNumeric(cp)) {
            this._flushCodePointConsumedAsCharacterReference(cp);
        }
        else {
            if (cp === $.SEMICOLON) {
                this._err(ERR.unknownNamedCharacterReference);
            }
            this.state = this.returnState;
            this._callState(cp);
        }
    }
}