permapp/node_modules/parse5/lib/tokenizer/index.js

'use strict';

const Preprocessor = require('./preprocessor');
const unicode = require('../common/unicode');
const neTree = require('./named-entity-data');
const ERR = require('../common/error-codes');

//Aliases
const $ = unicode.CODE_POINTS;
const $$ = unicode.CODE_POINT_SEQUENCES;

//C1 Unicode control character reference replacements
const C1_CONTROLS_REFERENCE_REPLACEMENTS = {
    0x80: 0x20ac,
    0x82: 0x201a,
    0x83: 0x0192,
    0x84: 0x201e,
    0x85: 0x2026,
    0x86: 0x2020,
    0x87: 0x2021,
    0x88: 0x02c6,
    0x89: 0x2030,
    0x8a: 0x0160,
    0x8b: 0x2039,
    0x8c: 0x0152,
    0x8e: 0x017d,
    0x91: 0x2018,
    0x92: 0x2019,
    0x93: 0x201c,
    0x94: 0x201d,
    0x95: 0x2022,
    0x96: 0x2013,
    0x97: 0x2014,
    0x98: 0x02dc,
    0x99: 0x2122,
    0x9a: 0x0161,
    0x9b: 0x203a,
    0x9c: 0x0153,
    0x9e: 0x017e,
    0x9f: 0x0178
};

// Named entity tree flags
const HAS_DATA_FLAG = 1 << 0;
const DATA_DUPLET_FLAG = 1 << 1;
const HAS_BRANCHES_FLAG = 1 << 2;
const MAX_BRANCH_MARKER_VALUE = HAS_DATA_FLAG | DATA_DUPLET_FLAG | HAS_BRANCHES_FLAG;

//States
const DATA_STATE = 'DATA_STATE';
const RCDATA_STATE = 'RCDATA_STATE';
const RAWTEXT_STATE = 'RAWTEXT_STATE';
const SCRIPT_DATA_STATE = 'SCRIPT_DATA_STATE';
const PLAINTEXT_STATE = 'PLAINTEXT_STATE';
const TAG_OPEN_STATE = 'TAG_OPEN_STATE';
const END_TAG_OPEN_STATE = 'END_TAG_OPEN_STATE';
const TAG_NAME_STATE = 'TAG_NAME_STATE';
const RCDATA_LESS_THAN_SIGN_STATE = 'RCDATA_LESS_THAN_SIGN_STATE';
const RCDATA_END_TAG_OPEN_STATE = 'RCDATA_END_TAG_OPEN_STATE';
const RCDATA_END_TAG_NAME_STATE = 'RCDATA_END_TAG_NAME_STATE';
const RAWTEXT_LESS_THAN_SIGN_STATE = 'RAWTEXT_LESS_THAN_SIGN_STATE';
const RAWTEXT_END_TAG_OPEN_STATE = 'RAWTEXT_END_TAG_OPEN_STATE';
const RAWTEXT_END_TAG_NAME_STATE = 'RAWTEXT_END_TAG_NAME_STATE';
const SCRIPT_DATA_LESS_THAN_SIGN_STATE = 'SCRIPT_DATA_LESS_THAN_SIGN_STATE';
const SCRIPT_DATA_END_TAG_OPEN_STATE = 'SCRIPT_DATA_END_TAG_OPEN_STATE';
const SCRIPT_DATA_END_TAG_NAME_STATE = 'SCRIPT_DATA_END_TAG_NAME_STATE';
const SCRIPT_DATA_ESCAPE_START_STATE = 'SCRIPT_DATA_ESCAPE_START_STATE';
const SCRIPT_DATA_ESCAPE_START_DASH_STATE = 'SCRIPT_DATA_ESCAPE_START_DASH_STATE';
const SCRIPT_DATA_ESCAPED_STATE = 'SCRIPT_DATA_ESCAPED_STATE';
const SCRIPT_DATA_ESCAPED_DASH_STATE = 'SCRIPT_DATA_ESCAPED_DASH_STATE';
const SCRIPT_DATA_ESCAPED_DASH_DASH_STATE = 'SCRIPT_DATA_ESCAPED_DASH_DASH_STATE';
const SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN_STATE = 'SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN_STATE';
const SCRIPT_DATA_ESCAPED_END_TAG_OPEN_STATE = 'SCRIPT_DATA_ESCAPED_END_TAG_OPEN_STATE';
const SCRIPT_DATA_ESCAPED_END_TAG_NAME_STATE = 'SCRIPT_DATA_ESCAPED_END_TAG_NAME_STATE';
const SCRIPT_DATA_DOUBLE_ESCAPE_START_STATE = 'SCRIPT_DATA_DOUBLE_ESCAPE_START_STATE';
const SCRIPT_DATA_DOUBLE_ESCAPED_STATE = 'SCRIPT_DATA_DOUBLE_ESCAPED_STATE';
const SCRIPT_DATA_DOUBLE_ESCAPED_DASH_STATE = 'SCRIPT_DATA_DOUBLE_ESCAPED_DASH_STATE';
const SCRIPT_DATA_DOUBLE_ESCAPED_DASH_DASH_STATE = 'SCRIPT_DATA_DOUBLE_ESCAPED_DASH_DASH_STATE';
const SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN_STATE = 'SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN_STATE';
const SCRIPT_DATA_DOUBLE_ESCAPE_END_STATE = 'SCRIPT_DATA_DOUBLE_ESCAPE_END_STATE';
const BEFORE_ATTRIBUTE_NAME_STATE = 'BEFORE_ATTRIBUTE_NAME_STATE';
const ATTRIBUTE_NAME_STATE = 'ATTRIBUTE_NAME_STATE';
const AFTER_ATTRIBUTE_NAME_STATE = 'AFTER_ATTRIBUTE_NAME_STATE';
const BEFORE_ATTRIBUTE_VALUE_STATE = 'BEFORE_ATTRIBUTE_VALUE_STATE';
const ATTRIBUTE_VALUE_DOUBLE_QUOTED_STATE = 'ATTRIBUTE_VALUE_DOUBLE_QUOTED_STATE';
const ATTRIBUTE_VALUE_SINGLE_QUOTED_STATE = 'ATTRIBUTE_VALUE_SINGLE_QUOTED_STATE';
const ATTRIBUTE_VALUE_UNQUOTED_STATE = 'ATTRIBUTE_VALUE_UNQUOTED_STATE';
const AFTER_ATTRIBUTE_VALUE_QUOTED_STATE = 'AFTER_ATTRIBUTE_VALUE_QUOTED_STATE';
const SELF_CLOSING_START_TAG_STATE = 'SELF_CLOSING_START_TAG_STATE';
const BOGUS_COMMENT_STATE = 'BOGUS_COMMENT_STATE';
const MARKUP_DECLARATION_OPEN_STATE = 'MARKUP_DECLARATION_OPEN_STATE';
const COMMENT_START_STATE = 'COMMENT_START_STATE';
const COMMENT_START_DASH_STATE = 'COMMENT_START_DASH_STATE';
const COMMENT_STATE = 'COMMENT_STATE';
const COMMENT_LESS_THAN_SIGN_STATE = 'COMMENT_LESS_THAN_SIGN_STATE';
const COMMENT_LESS_THAN_SIGN_BANG_STATE = 'COMMENT_LESS_THAN_SIGN_BANG_STATE';
const COMMENT_LESS_THAN_SIGN_BANG_DASH_STATE = 'COMMENT_LESS_THAN_SIGN_BANG_DASH_STATE';
const COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH_STATE = 'COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH_STATE';
const COMMENT_END_DASH_STATE = 'COMMENT_END_DASH_STATE';
const COMMENT_END_STATE = 'COMMENT_END_STATE';
const COMMENT_END_BANG_STATE = 'COMMENT_END_BANG_STATE';
const DOCTYPE_STATE = 'DOCTYPE_STATE';
const BEFORE_DOCTYPE_NAME_STATE = 'BEFORE_DOCTYPE_NAME_STATE';
const DOCTYPE_NAME_STATE = 'DOCTYPE_NAME_STATE';
const AFTER_DOCTYPE_NAME_STATE = 'AFTER_DOCTYPE_NAME_STATE';
const AFTER_DOCTYPE_PUBLIC_KEYWORD_STATE = 'AFTER_DOCTYPE_PUBLIC_KEYWORD_STATE';
const BEFORE_DOCTYPE_PUBLIC_IDENTIFIER_STATE = 'BEFORE_DOCTYPE_PUBLIC_IDENTIFIER_STATE';
const DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED_STATE = 'DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED_STATE';
const DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED_STATE = 'DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED_STATE';
const AFTER_DOCTYPE_PUBLIC_IDENTIFIER_STATE = 'AFTER_DOCTYPE_PUBLIC_IDENTIFIER_STATE';
const BETWEEN_DOCTYPE_PUBLIC_AND_SYSTEM_IDENTIFIERS_STATE = 'BETWEEN_DOCTYPE_PUBLIC_AND_SYSTEM_IDENTIFIERS_STATE';
const AFTER_DOCTYPE_SYSTEM_KEYWORD_STATE = 'AFTER_DOCTYPE_SYSTEM_KEYWORD_STATE';
const BEFORE_DOCTYPE_SYSTEM_IDENTIFIER_STATE = 'BEFORE_DOCTYPE_SYSTEM_IDENTIFIER_STATE';
const DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED_STATE = 'DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED_STATE';
const DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED_STATE = 'DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED_STATE';
const AFTER_DOCTYPE_SYSTEM_IDENTIFIER_STATE = 'AFTER_DOCTYPE_SYSTEM_IDENTIFIER_STATE';
const BOGUS_DOCTYPE_STATE = 'BOGUS_DOCTYPE_STATE';
const CDATA_SECTION_STATE = 'CDATA_SECTION_STATE';
const CDATA_SECTION_BRACKET_STATE = 'CDATA_SECTION_BRACKET_STATE';
const CDATA_SECTION_END_STATE = 'CDATA_SECTION_END_STATE';
const CHARACTER_REFERENCE_STATE = 'CHARACTER_REFERENCE_STATE';
const NAMED_CHARACTER_REFERENCE_STATE = 'NAMED_CHARACTER_REFERENCE_STATE';
const AMBIGUOUS_AMPERSAND_STATE = 'AMBIGUOS_AMPERSAND_STATE';
const NUMERIC_CHARACTER_REFERENCE_STATE = 'NUMERIC_CHARACTER_REFERENCE_STATE';
const HEXADEMICAL_CHARACTER_REFERENCE_START_STATE = 'HEXADEMICAL_CHARACTER_REFERENCE_START_STATE';
const DECIMAL_CHARACTER_REFERENCE_START_STATE = 'DECIMAL_CHARACTER_REFERENCE_START_STATE';
const HEXADEMICAL_CHARACTER_REFERENCE_STATE = 'HEXADEMICAL_CHARACTER_REFERENCE_STATE';
const DECIMAL_CHARACTER_REFERENCE_STATE = 'DECIMAL_CHARACTER_REFERENCE_STATE';
const NUMERIC_CHARACTER_REFERENCE_END_STATE = 'NUMERIC_CHARACTER_REFERENCE_END_STATE';

//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 isWhitespace(cp) {
    return cp === $.SPACE || cp === $.LINE_FEED || cp === $.TABULATION || cp === $.FORM_FEED;
}

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 isAsciiUpperHexDigit(cp) {
    return cp >= $.LATIN_CAPITAL_A && cp <= $.LATIN_CAPITAL_F;
}

function isAsciiLowerHexDigit(cp) {
    return cp >= $.LATIN_SMALL_A && cp <= $.LATIN_SMALL_F;
}

function isAsciiHexDigit(cp) {
    return isAsciiDigit(cp) || isAsciiUpperHexDigit(cp) || isAsciiLowerHexDigit(cp);
}

function toAsciiLowerCodePoint(cp) {
    return cp + 0x0020;
}

//NOTE: String.fromCharCode() function can handle only characters from BMP subset.
//So, we need to workaround this manually.
//(see: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/String/fromCharCode#Getting_it_to_work_with_higher_values)
function toChar(cp) {
    if (cp <= 0xffff) {
        return String.fromCharCode(cp);
    }

    cp -= 0x10000;
    return String.fromCharCode(((cp >>> 10) & 0x3ff) | 0xd800) + String.fromCharCode(0xdc00 | (cp & 0x3ff));
}

function toAsciiLowerChar(cp) {
    return String.fromCharCode(toAsciiLowerCodePoint(cp));
}

function findNamedEntityTreeBranch(nodeIx, cp) {
    const branchCount = neTree[++nodeIx];
    let lo = ++nodeIx;
    let hi = lo + branchCount - 1;

    while (lo <= hi) {
        const mid = (lo + hi) >>> 1;
        const midCp = neTree[mid];

        if (midCp < cp) {
            lo = mid + 1;
        } else if (midCp > cp) {
            hi = mid - 1;
        } else {
            return neTree[mid + branchCount];
        }
    }

    return -1;
}

//Tokenizer
class Tokenizer {
    constructor() {
        this.preprocessor = new Preprocessor();

        this.tokenQueue = [];

        this.allowCDATA = false;

        this.state = DATA_STATE;
        this.returnState = '';

        this.charRefCode = -1;
        this.tempBuff = [];
        this.lastStartTagName = '';

        this.consumedAfterSnapshot = -1;
        this.active = false;

        this.currentCharacterToken = null;
        this.currentToken = null;
        this.currentAttr = null;
    }

    //Errors
    _err() {
        // NOTE: err reporting is noop by default. Enabled by mixin.
    }

    _errOnNextCodePoint(err) {
        this._consume();
        this._err(err);
        this._unconsume();
    }

    //API
    getNextToken() {
        while (!this.tokenQueue.length && this.active) {
            this.consumedAfterSnapshot = 0;

            const cp = this._consume();

            if (!this._ensureHibernation()) {
                this[this.state](cp);
            }
        }

        return this.tokenQueue.shift();
    }

    write(chunk, isLastChunk) {
        this.active = true;
        this.preprocessor.write(chunk, isLastChunk);
    }

    insertHtmlAtCurrentPos(chunk) {
        this.active = true;
        this.preprocessor.insertHtmlAtCurrentPos(chunk);
    }

    //Hibernation
    _ensureHibernation() {
        if (this.preprocessor.endOfChunkHit) {
            for (; this.consumedAfterSnapshot > 0; this.consumedAfterSnapshot--) {
                this.preprocessor.retreat();
            }

            this.active = false;
            this.tokenQueue.push({ type: Tokenizer.HIBERNATION_TOKEN });

            return true;
        }

        return false;
    }

    //Consumption
    _consume() {
        this.consumedAfterSnapshot++;
        return this.preprocessor.advance();
    }

    _unconsume() {
        this.consumedAfterSnapshot--;
        this.preprocessor.retreat();
    }

    _reconsumeInState(state) {
        this.state = state;
        this._unconsume();
    }

    _consumeSequenceIfMatch(pattern, startCp, caseSensitive) {
        let consumedCount = 0;
        let isMatch = true;
        const patternLength = pattern.length;
        let patternPos = 0;
        let cp = startCp;
        let patternCp = void 0;

        for (; patternPos < patternLength; patternPos++) {
            if (patternPos > 0) {
                cp = this._consume();
                consumedCount++;
            }

            if (cp === $.EOF) {
                isMatch = false;
                break;
            }

            patternCp = pattern[patternPos];

            if (cp !== patternCp && (caseSensitive || cp !== toAsciiLowerCodePoint(patternCp))) {
                isMatch = false;
                break;
            }
        }

        if (!isMatch) {
            while (consumedCount--) {
                this._unconsume();
            }
        }

        return isMatch;
    }

    //Temp buffer
    _isTempBufferEqualToScriptString() {
        if (this.tempBuff.length !== $$.SCRIPT_STRING.length) {
            return false;
        }

        for (let i = 0; i < this.tempBuff.length; i++) {
            if (this.tempBuff[i] !== $$.SCRIPT_STRING[i]) {
                return false;
            }
        }

        return true;
    }

    //Token creation
    _createStartTagToken() {
        this.currentToken = {
            type: Tokenizer.START_TAG_TOKEN,
            tagName: '',
            selfClosing: false,
            ackSelfClosing: false,
            attrs: []
        };
    }

    _createEndTagToken() {
        this.currentToken = {
            type: Tokenizer.END_TAG_TOKEN,
            tagName: '',
            selfClosing: false,
            attrs: []
        };
    }

    _createCommentToken() {
        this.currentToken = {
            type: Tokenizer.COMMENT_TOKEN,
            data: ''
        };
    }

    _createDoctypeToken(initialName) {
        this.currentToken = {
            type: Tokenizer.DOCTYPE_TOKEN,
            name: initialName,
            forceQuirks: false,
            publicId: null,
            systemId: null
        };
    }

    _createCharacterToken(type, ch) {
        this.currentCharacterToken = {
            type: type,
            chars: ch
        };
    }

    _createEOFToken() {
        this.currentToken = { type: Tokenizer.EOF_TOKEN };
    }

    //Tag attributes
    _createAttr(attrNameFirstCh) {
        this.currentAttr = {
            name: attrNameFirstCh,
            value: ''
        };
    }

    _leaveAttrName(toState) {
        if (Tokenizer.getTokenAttr(this.currentToken, this.currentAttr.name) === null) {
            this.currentToken.attrs.push(this.currentAttr);
        } else {
            this._err(ERR.duplicateAttribute);
        }

        this.state = toState;
    }

    _leaveAttrValue(toState) {
        this.state = toState;
    }

    //Token emission
    _emitCurrentToken() {
        this._emitCurrentCharacterToken();

        const ct = this.currentToken;

        this.currentToken = null;

        //NOTE: store emited start tag's tagName to determine is the following end tag token is appropriate.
        if (ct.type === Tokenizer.START_TAG_TOKEN) {
            this.lastStartTagName = ct.tagName;
        } else if (ct.type === Tokenizer.END_TAG_TOKEN) {
            if (ct.attrs.length > 0) {
                this._err(ERR.endTagWithAttributes);
            }

            if (ct.selfClosing) {
                this._err(ERR.endTagWithTrailingSolidus);
            }
        }

        this.tokenQueue.push(ct);
    }

    _emitCurrentCharacterToken() {
        if (this.currentCharacterToken) {
            this.tokenQueue.push(this.currentCharacterToken);
            this.currentCharacterToken = null;
        }
    }

    _emitEOFToken() {
        this._createEOFToken();
        this._emitCurrentToken();
    }

    //Characters emission

    //OPTIMIZATION: specification uses only one type of character tokens (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, parser can process it
    //as a single solid character token.
    //So, there are 3 types of character tokens in parse5:
    //1)NULL_CHARACTER_TOKEN - \u0000-character sequences (e.g. '\u0000\u0000\u0000')
    //2)WHITESPACE_CHARACTER_TOKEN - any whitespace/new-line character sequences (e.g. '\n  \r\t   \f')
    //3)CHARACTER_TOKEN - any character sequence which don't belong to groups 1 and 2 (e.g. 'abcdef1234@@#$%^')
    _appendCharToCurrentCharacterToken(type, ch) {
        if (this.currentCharacterToken && this.currentCharacterToken.type !== type) {
            this._emitCurrentCharacterToken();
        }

        if (this.currentCharacterToken) {
            this.currentCharacterToken.chars += ch;
        } else {
            this._createCharacterToken(type, ch);
        }
    }

    _emitCodePoint(cp) {
        let type = Tokenizer.CHARACTER_TOKEN;

        if (isWhitespace(cp)) {
            type = Tokenizer.WHITESPACE_CHARACTER_TOKEN;
        } else if (cp === $.NULL) {
            type = Tokenizer.NULL_CHARACTER_TOKEN;
        }

        this._appendCharToCurrentCharacterToken(type, toChar(cp));
    }

    _emitSeveralCodePoints(codePoints) {
        for (let i = 0; i < codePoints.length; i++) {
            this._emitCodePoint(codePoints[i]);
        }
    }

    //NOTE: used then we emit character explicitly. This is always a non-whitespace and a non-null character.
    //So we can avoid additional checks here.
    _emitChars(ch) {
        this._appendCharToCurrentCharacterToken(Tokenizer.CHARACTER_TOKEN, ch);
    }

    // Character reference helpers
    _matchNamedCharacterReference(startCp) {
        let result = null;
        let excess = 1;
        let i = findNamedEntityTreeBranch(0, startCp);

        this.tempBuff.push(startCp);

        while (i > -1) {
            const current = neTree[i];
            const inNode = current < MAX_BRANCH_MARKER_VALUE;
            const nodeWithData = inNode && current & HAS_DATA_FLAG;

            if (nodeWithData) {
                //NOTE: we use greedy search, so we continue lookup at this point
                result = current & DATA_DUPLET_FLAG ? [neTree[++i], neTree[++i]] : [neTree[++i]];
                excess = 0;
            }

            const cp = this._consume();

            this.tempBuff.push(cp);
            excess++;

            if (cp === $.EOF) {
                break;
            }

            if (inNode) {
                i = current & HAS_BRANCHES_FLAG ? findNamedEntityTreeBranch(i, cp) : -1;
            } else {
                i = cp === current ? ++i : -1;
            }
        }

        while (excess--) {
            this.tempBuff.pop();
            this._unconsume();
        }

        return result;
    }

    _isCharacterReferenceInAttribute() {
        return (
            this.returnState === ATTRIBUTE_VALUE_DOUBLE_QUOTED_STATE ||
            this.returnState === ATTRIBUTE_VALUE_SINGLE_QUOTED_STATE ||
            this.returnState === ATTRIBUTE_VALUE_UNQUOTED_STATE
        );
    }

    _isCharacterReferenceAttributeQuirk(withSemicolon) {
        if (!withSemicolon && this._isCharacterReferenceInAttribute()) {
            const nextCp = this._consume();

            this._unconsume();

            return nextCp === $.EQUALS_SIGN || isAsciiAlphaNumeric(nextCp);
        }

        return false;
    }

    _flushCodePointsConsumedAsCharacterReference() {
        if (this._isCharacterReferenceInAttribute()) {
            for (let i = 0; i < this.tempBuff.length; i++) {
                this.currentAttr.value += toChar(this.tempBuff[i]);
            }
        } else {
            this._emitSeveralCodePoints(this.tempBuff);
        }

        this.tempBuff = [];
    }

    // State machine

    // Data state
    //------------------------------------------------------------------
    [DATA_STATE](cp) {
        this.preprocessor.dropParsedChunk();

        if (cp === $.LESS_THAN_SIGN) {
            this.state = TAG_OPEN_STATE;
        } else if (cp === $.AMPERSAND) {
            this.returnState = DATA_STATE;
            this.state = CHARACTER_REFERENCE_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this._emitCodePoint(cp);
        } else if (cp === $.EOF) {
            this._emitEOFToken();
        } else {
            this._emitCodePoint(cp);
        }
    }

    //  RCDATA state
    //------------------------------------------------------------------
    [RCDATA_STATE](cp) {
        this.preprocessor.dropParsedChunk();

        if (cp === $.AMPERSAND) {
            this.returnState = RCDATA_STATE;
            this.state = CHARACTER_REFERENCE_STATE;
        } else if (cp === $.LESS_THAN_SIGN) {
            this.state = RCDATA_LESS_THAN_SIGN_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._emitEOFToken();
        } else {
            this._emitCodePoint(cp);
        }
    }

    // RAWTEXT state
    //------------------------------------------------------------------
    [RAWTEXT_STATE](cp) {
        this.preprocessor.dropParsedChunk();

        if (cp === $.LESS_THAN_SIGN) {
            this.state = RAWTEXT_LESS_THAN_SIGN_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._emitEOFToken();
        } else {
            this._emitCodePoint(cp);
        }
    }

    // Script data state
    //------------------------------------------------------------------
    [SCRIPT_DATA_STATE](cp) {
        this.preprocessor.dropParsedChunk();

        if (cp === $.LESS_THAN_SIGN) {
            this.state = SCRIPT_DATA_LESS_THAN_SIGN_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._emitEOFToken();
        } else {
            this._emitCodePoint(cp);
        }
    }

    // PLAINTEXT state
    //------------------------------------------------------------------
    [PLAINTEXT_STATE](cp) {
        this.preprocessor.dropParsedChunk();

        if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._emitEOFToken();
        } else {
            this._emitCodePoint(cp);
        }
    }

    // Tag open state
    //------------------------------------------------------------------
    [TAG_OPEN_STATE](cp) {
        if (cp === $.EXCLAMATION_MARK) {
            this.state = MARKUP_DECLARATION_OPEN_STATE;
        } else if (cp === $.SOLIDUS) {
            this.state = END_TAG_OPEN_STATE;
        } else if (isAsciiLetter(cp)) {
            this._createStartTagToken();
            this._reconsumeInState(TAG_NAME_STATE);
        } else if (cp === $.QUESTION_MARK) {
            this._err(ERR.unexpectedQuestionMarkInsteadOfTagName);
            this._createCommentToken();
            this._reconsumeInState(BOGUS_COMMENT_STATE);
        } else if (cp === $.EOF) {
            this._err(ERR.eofBeforeTagName);
            this._emitChars('<');
            this._emitEOFToken();
        } else {
            this._err(ERR.invalidFirstCharacterOfTagName);
            this._emitChars('<');
            this._reconsumeInState(DATA_STATE);
        }
    }

    // End tag open state
    //------------------------------------------------------------------
    [END_TAG_OPEN_STATE](cp) {
        if (isAsciiLetter(cp)) {
            this._createEndTagToken();
            this._reconsumeInState(TAG_NAME_STATE);
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.missingEndTagName);
            this.state = DATA_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofBeforeTagName);
            this._emitChars('</');
            this._emitEOFToken();
        } else {
            this._err(ERR.invalidFirstCharacterOfTagName);
            this._createCommentToken();
            this._reconsumeInState(BOGUS_COMMENT_STATE);
        }
    }

    // Tag name state
    //------------------------------------------------------------------
    [TAG_NAME_STATE](cp) {
        if (isWhitespace(cp)) {
            this.state = BEFORE_ATTRIBUTE_NAME_STATE;
        } else if (cp === $.SOLIDUS) {
            this.state = SELF_CLOSING_START_TAG_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (isAsciiUpper(cp)) {
            this.currentToken.tagName += toAsciiLowerChar(cp);
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentToken.tagName += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInTag);
            this._emitEOFToken();
        } else {
            this.currentToken.tagName += toChar(cp);
        }
    }

    // RCDATA less-than sign state
    //------------------------------------------------------------------
    [RCDATA_LESS_THAN_SIGN_STATE](cp) {
        if (cp === $.SOLIDUS) {
            this.tempBuff = [];
            this.state = RCDATA_END_TAG_OPEN_STATE;
        } else {
            this._emitChars('<');
            this._reconsumeInState(RCDATA_STATE);
        }
    }

    // RCDATA end tag open state
    //------------------------------------------------------------------
    [RCDATA_END_TAG_OPEN_STATE](cp) {
        if (isAsciiLetter(cp)) {
            this._createEndTagToken();
            this._reconsumeInState(RCDATA_END_TAG_NAME_STATE);
        } else {
            this._emitChars('</');
            this._reconsumeInState(RCDATA_STATE);
        }
    }

    // RCDATA end tag name state
    //------------------------------------------------------------------
    [RCDATA_END_TAG_NAME_STATE](cp) {
        if (isAsciiUpper(cp)) {
            this.currentToken.tagName += toAsciiLowerChar(cp);
            this.tempBuff.push(cp);
        } else if (isAsciiLower(cp)) {
            this.currentToken.tagName += toChar(cp);
            this.tempBuff.push(cp);
        } else {
            if (this.lastStartTagName === this.currentToken.tagName) {
                if (isWhitespace(cp)) {
                    this.state = BEFORE_ATTRIBUTE_NAME_STATE;
                    return;
                }

                if (cp === $.SOLIDUS) {
                    this.state = SELF_CLOSING_START_TAG_STATE;
                    return;
                }

                if (cp === $.GREATER_THAN_SIGN) {
                    this.state = DATA_STATE;
                    this._emitCurrentToken();
                    return;
                }
            }

            this._emitChars('</');
            this._emitSeveralCodePoints(this.tempBuff);
            this._reconsumeInState(RCDATA_STATE);
        }
    }

    // RAWTEXT less-than sign state
    //------------------------------------------------------------------
    [RAWTEXT_LESS_THAN_SIGN_STATE](cp) {
        if (cp === $.SOLIDUS) {
            this.tempBuff = [];
            this.state = RAWTEXT_END_TAG_OPEN_STATE;
        } else {
            this._emitChars('<');
            this._reconsumeInState(RAWTEXT_STATE);
        }
    }

    // RAWTEXT end tag open state
    //------------------------------------------------------------------
    [RAWTEXT_END_TAG_OPEN_STATE](cp) {
        if (isAsciiLetter(cp)) {
            this._createEndTagToken();
            this._reconsumeInState(RAWTEXT_END_TAG_NAME_STATE);
        } else {
            this._emitChars('</');
            this._reconsumeInState(RAWTEXT_STATE);
        }
    }

    // RAWTEXT end tag name state
    //------------------------------------------------------------------
    [RAWTEXT_END_TAG_NAME_STATE](cp) {
        if (isAsciiUpper(cp)) {
            this.currentToken.tagName += toAsciiLowerChar(cp);
            this.tempBuff.push(cp);
        } else if (isAsciiLower(cp)) {
            this.currentToken.tagName += toChar(cp);
            this.tempBuff.push(cp);
        } else {
            if (this.lastStartTagName === this.currentToken.tagName) {
                if (isWhitespace(cp)) {
                    this.state = BEFORE_ATTRIBUTE_NAME_STATE;
                    return;
                }

                if (cp === $.SOLIDUS) {
                    this.state = SELF_CLOSING_START_TAG_STATE;
                    return;
                }

                if (cp === $.GREATER_THAN_SIGN) {
                    this._emitCurrentToken();
                    this.state = DATA_STATE;
                    return;
                }
            }

            this._emitChars('</');
            this._emitSeveralCodePoints(this.tempBuff);
            this._reconsumeInState(RAWTEXT_STATE);
        }
    }

    // Script data less-than sign state
    //------------------------------------------------------------------
    [SCRIPT_DATA_LESS_THAN_SIGN_STATE](cp) {
        if (cp === $.SOLIDUS) {
            this.tempBuff = [];
            this.state = SCRIPT_DATA_END_TAG_OPEN_STATE;
        } else if (cp === $.EXCLAMATION_MARK) {
            this.state = SCRIPT_DATA_ESCAPE_START_STATE;
            this._emitChars('<!');
        } else {
            this._emitChars('<');
            this._reconsumeInState(SCRIPT_DATA_STATE);
        }
    }

    // Script data end tag open state
    //------------------------------------------------------------------
    [SCRIPT_DATA_END_TAG_OPEN_STATE](cp) {
        if (isAsciiLetter(cp)) {
            this._createEndTagToken();
            this._reconsumeInState(SCRIPT_DATA_END_TAG_NAME_STATE);
        } else {
            this._emitChars('</');
            this._reconsumeInState(SCRIPT_DATA_STATE);
        }
    }

    // Script data end tag name state
    //------------------------------------------------------------------
    [SCRIPT_DATA_END_TAG_NAME_STATE](cp) {
        if (isAsciiUpper(cp)) {
            this.currentToken.tagName += toAsciiLowerChar(cp);
            this.tempBuff.push(cp);
        } else if (isAsciiLower(cp)) {
            this.currentToken.tagName += toChar(cp);
            this.tempBuff.push(cp);
        } else {
            if (this.lastStartTagName === this.currentToken.tagName) {
                if (isWhitespace(cp)) {
                    this.state = BEFORE_ATTRIBUTE_NAME_STATE;
                    return;
                } else if (cp === $.SOLIDUS) {
                    this.state = SELF_CLOSING_START_TAG_STATE;
                    return;
                } else if (cp === $.GREATER_THAN_SIGN) {
                    this._emitCurrentToken();
                    this.state = DATA_STATE;
                    return;
                }
            }

            this._emitChars('</');
            this._emitSeveralCodePoints(this.tempBuff);
            this._reconsumeInState(SCRIPT_DATA_STATE);
        }
    }

    // Script data escape start state
    //------------------------------------------------------------------
    [SCRIPT_DATA_ESCAPE_START_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = SCRIPT_DATA_ESCAPE_START_DASH_STATE;
            this._emitChars('-');
        } else {
            this._reconsumeInState(SCRIPT_DATA_STATE);
        }
    }

    // Script data escape start dash state
    //------------------------------------------------------------------
    [SCRIPT_DATA_ESCAPE_START_DASH_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = SCRIPT_DATA_ESCAPED_DASH_DASH_STATE;
            this._emitChars('-');
        } else {
            this._reconsumeInState(SCRIPT_DATA_STATE);
        }
    }

    // Script data escaped state
    //------------------------------------------------------------------
    [SCRIPT_DATA_ESCAPED_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = SCRIPT_DATA_ESCAPED_DASH_STATE;
            this._emitChars('-');
        } else if (cp === $.LESS_THAN_SIGN) {
            this.state = SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._err(ERR.eofInScriptHtmlCommentLikeText);
            this._emitEOFToken();
        } else {
            this._emitCodePoint(cp);
        }
    }

    // Script data escaped dash state
    //------------------------------------------------------------------
    [SCRIPT_DATA_ESCAPED_DASH_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = SCRIPT_DATA_ESCAPED_DASH_DASH_STATE;
            this._emitChars('-');
        } else if (cp === $.LESS_THAN_SIGN) {
            this.state = SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.state = SCRIPT_DATA_ESCAPED_STATE;
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._err(ERR.eofInScriptHtmlCommentLikeText);
            this._emitEOFToken();
        } else {
            this.state = SCRIPT_DATA_ESCAPED_STATE;
            this._emitCodePoint(cp);
        }
    }

    // Script data escaped dash dash state
    //------------------------------------------------------------------
    [SCRIPT_DATA_ESCAPED_DASH_DASH_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this._emitChars('-');
        } else if (cp === $.LESS_THAN_SIGN) {
            this.state = SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this.state = SCRIPT_DATA_STATE;
            this._emitChars('>');
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.state = SCRIPT_DATA_ESCAPED_STATE;
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._err(ERR.eofInScriptHtmlCommentLikeText);
            this._emitEOFToken();
        } else {
            this.state = SCRIPT_DATA_ESCAPED_STATE;
            this._emitCodePoint(cp);
        }
    }

    // Script data escaped less-than sign state
    //------------------------------------------------------------------
    [SCRIPT_DATA_ESCAPED_LESS_THAN_SIGN_STATE](cp) {
        if (cp === $.SOLIDUS) {
            this.tempBuff = [];
            this.state = SCRIPT_DATA_ESCAPED_END_TAG_OPEN_STATE;
        } else if (isAsciiLetter(cp)) {
            this.tempBuff = [];
            this._emitChars('<');
            this._reconsumeInState(SCRIPT_DATA_DOUBLE_ESCAPE_START_STATE);
        } else {
            this._emitChars('<');
            this._reconsumeInState(SCRIPT_DATA_ESCAPED_STATE);
        }
    }

    // Script data escaped end tag open state
    //------------------------------------------------------------------
    [SCRIPT_DATA_ESCAPED_END_TAG_OPEN_STATE](cp) {
        if (isAsciiLetter(cp)) {
            this._createEndTagToken();
            this._reconsumeInState(SCRIPT_DATA_ESCAPED_END_TAG_NAME_STATE);
        } else {
            this._emitChars('</');
            this._reconsumeInState(SCRIPT_DATA_ESCAPED_STATE);
        }
    }

    // Script data escaped end tag name state
    //------------------------------------------------------------------
    [SCRIPT_DATA_ESCAPED_END_TAG_NAME_STATE](cp) {
        if (isAsciiUpper(cp)) {
            this.currentToken.tagName += toAsciiLowerChar(cp);
            this.tempBuff.push(cp);
        } else if (isAsciiLower(cp)) {
            this.currentToken.tagName += toChar(cp);
            this.tempBuff.push(cp);
        } else {
            if (this.lastStartTagName === this.currentToken.tagName) {
                if (isWhitespace(cp)) {
                    this.state = BEFORE_ATTRIBUTE_NAME_STATE;
                    return;
                }

                if (cp === $.SOLIDUS) {
                    this.state = SELF_CLOSING_START_TAG_STATE;
                    return;
                }

                if (cp === $.GREATER_THAN_SIGN) {
                    this._emitCurrentToken();
                    this.state = DATA_STATE;
                    return;
                }
            }

            this._emitChars('</');
            this._emitSeveralCodePoints(this.tempBuff);
            this._reconsumeInState(SCRIPT_DATA_ESCAPED_STATE);
        }
    }

    // Script data double escape start state
    //------------------------------------------------------------------
    [SCRIPT_DATA_DOUBLE_ESCAPE_START_STATE](cp) {
        if (isWhitespace(cp) || cp === $.SOLIDUS || cp === $.GREATER_THAN_SIGN) {
            this.state = this._isTempBufferEqualToScriptString()
                ? SCRIPT_DATA_DOUBLE_ESCAPED_STATE
                : SCRIPT_DATA_ESCAPED_STATE;
            this._emitCodePoint(cp);
        } else if (isAsciiUpper(cp)) {
            this.tempBuff.push(toAsciiLowerCodePoint(cp));
            this._emitCodePoint(cp);
        } else if (isAsciiLower(cp)) {
            this.tempBuff.push(cp);
            this._emitCodePoint(cp);
        } else {
            this._reconsumeInState(SCRIPT_DATA_ESCAPED_STATE);
        }
    }

    // Script data double escaped state
    //------------------------------------------------------------------
    [SCRIPT_DATA_DOUBLE_ESCAPED_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_DASH_STATE;
            this._emitChars('-');
        } else if (cp === $.LESS_THAN_SIGN) {
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN_STATE;
            this._emitChars('<');
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._err(ERR.eofInScriptHtmlCommentLikeText);
            this._emitEOFToken();
        } else {
            this._emitCodePoint(cp);
        }
    }

    // Script data double escaped dash state
    //------------------------------------------------------------------
    [SCRIPT_DATA_DOUBLE_ESCAPED_DASH_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_DASH_DASH_STATE;
            this._emitChars('-');
        } else if (cp === $.LESS_THAN_SIGN) {
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN_STATE;
            this._emitChars('<');
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_STATE;
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._err(ERR.eofInScriptHtmlCommentLikeText);
            this._emitEOFToken();
        } else {
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_STATE;
            this._emitCodePoint(cp);
        }
    }

    // Script data double escaped dash dash state
    //------------------------------------------------------------------
    [SCRIPT_DATA_DOUBLE_ESCAPED_DASH_DASH_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this._emitChars('-');
        } else if (cp === $.LESS_THAN_SIGN) {
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN_STATE;
            this._emitChars('<');
        } else if (cp === $.GREATER_THAN_SIGN) {
            this.state = SCRIPT_DATA_STATE;
            this._emitChars('>');
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_STATE;
            this._emitChars(unicode.REPLACEMENT_CHARACTER);
        } else if (cp === $.EOF) {
            this._err(ERR.eofInScriptHtmlCommentLikeText);
            this._emitEOFToken();
        } else {
            this.state = SCRIPT_DATA_DOUBLE_ESCAPED_STATE;
            this._emitCodePoint(cp);
        }
    }

    // Script data double escaped less-than sign state
    //------------------------------------------------------------------
    [SCRIPT_DATA_DOUBLE_ESCAPED_LESS_THAN_SIGN_STATE](cp) {
        if (cp === $.SOLIDUS) {
            this.tempBuff = [];
            this.state = SCRIPT_DATA_DOUBLE_ESCAPE_END_STATE;
            this._emitChars('/');
        } else {
            this._reconsumeInState(SCRIPT_DATA_DOUBLE_ESCAPED_STATE);
        }
    }

    // Script data double escape end state
    //------------------------------------------------------------------
    [SCRIPT_DATA_DOUBLE_ESCAPE_END_STATE](cp) {
        if (isWhitespace(cp) || cp === $.SOLIDUS || cp === $.GREATER_THAN_SIGN) {
            this.state = this._isTempBufferEqualToScriptString()
                ? SCRIPT_DATA_ESCAPED_STATE
                : SCRIPT_DATA_DOUBLE_ESCAPED_STATE;

            this._emitCodePoint(cp);
        } else if (isAsciiUpper(cp)) {
            this.tempBuff.push(toAsciiLowerCodePoint(cp));
            this._emitCodePoint(cp);
        } else if (isAsciiLower(cp)) {
            this.tempBuff.push(cp);
            this._emitCodePoint(cp);
        } else {
            this._reconsumeInState(SCRIPT_DATA_DOUBLE_ESCAPED_STATE);
        }
    }

    // Before attribute name state
    //------------------------------------------------------------------
    [BEFORE_ATTRIBUTE_NAME_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (cp === $.SOLIDUS || cp === $.GREATER_THAN_SIGN || cp === $.EOF) {
            this._reconsumeInState(AFTER_ATTRIBUTE_NAME_STATE);
        } else if (cp === $.EQUALS_SIGN) {
            this._err(ERR.unexpectedEqualsSignBeforeAttributeName);
            this._createAttr('=');
            this.state = ATTRIBUTE_NAME_STATE;
        } else {
            this._createAttr('');
            this._reconsumeInState(ATTRIBUTE_NAME_STATE);
        }
    }

    // Attribute name state
    //------------------------------------------------------------------
    [ATTRIBUTE_NAME_STATE](cp) {
        if (isWhitespace(cp) || cp === $.SOLIDUS || cp === $.GREATER_THAN_SIGN || cp === $.EOF) {
            this._leaveAttrName(AFTER_ATTRIBUTE_NAME_STATE);
            this._unconsume();
        } else if (cp === $.EQUALS_SIGN) {
            this._leaveAttrName(BEFORE_ATTRIBUTE_VALUE_STATE);
        } else if (isAsciiUpper(cp)) {
            this.currentAttr.name += toAsciiLowerChar(cp);
        } else if (cp === $.QUOTATION_MARK || cp === $.APOSTROPHE || cp === $.LESS_THAN_SIGN) {
            this._err(ERR.unexpectedCharacterInAttributeName);
            this.currentAttr.name += toChar(cp);
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentAttr.name += unicode.REPLACEMENT_CHARACTER;
        } else {
            this.currentAttr.name += toChar(cp);
        }
    }

    // After attribute name state
    //------------------------------------------------------------------
    [AFTER_ATTRIBUTE_NAME_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (cp === $.SOLIDUS) {
            this.state = SELF_CLOSING_START_TAG_STATE;
        } else if (cp === $.EQUALS_SIGN) {
            this.state = BEFORE_ATTRIBUTE_VALUE_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInTag);
            this._emitEOFToken();
        } else {
            this._createAttr('');
            this._reconsumeInState(ATTRIBUTE_NAME_STATE);
        }
    }

    // Before attribute value state
    //------------------------------------------------------------------
    [BEFORE_ATTRIBUTE_VALUE_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (cp === $.QUOTATION_MARK) {
            this.state = ATTRIBUTE_VALUE_DOUBLE_QUOTED_STATE;
        } else if (cp === $.APOSTROPHE) {
            this.state = ATTRIBUTE_VALUE_SINGLE_QUOTED_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.missingAttributeValue);
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else {
            this._reconsumeInState(ATTRIBUTE_VALUE_UNQUOTED_STATE);
        }
    }

    // Attribute value (double-quoted) state
    //------------------------------------------------------------------
    [ATTRIBUTE_VALUE_DOUBLE_QUOTED_STATE](cp) {
        if (cp === $.QUOTATION_MARK) {
            this.state = AFTER_ATTRIBUTE_VALUE_QUOTED_STATE;
        } else if (cp === $.AMPERSAND) {
            this.returnState = ATTRIBUTE_VALUE_DOUBLE_QUOTED_STATE;
            this.state = CHARACTER_REFERENCE_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentAttr.value += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInTag);
            this._emitEOFToken();
        } else {
            this.currentAttr.value += toChar(cp);
        }
    }

    // Attribute value (single-quoted) state
    //------------------------------------------------------------------
    [ATTRIBUTE_VALUE_SINGLE_QUOTED_STATE](cp) {
        if (cp === $.APOSTROPHE) {
            this.state = AFTER_ATTRIBUTE_VALUE_QUOTED_STATE;
        } else if (cp === $.AMPERSAND) {
            this.returnState = ATTRIBUTE_VALUE_SINGLE_QUOTED_STATE;
            this.state = CHARACTER_REFERENCE_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentAttr.value += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInTag);
            this._emitEOFToken();
        } else {
            this.currentAttr.value += toChar(cp);
        }
    }

    // Attribute value (unquoted) state
    //------------------------------------------------------------------
    [ATTRIBUTE_VALUE_UNQUOTED_STATE](cp) {
        if (isWhitespace(cp)) {
            this._leaveAttrValue(BEFORE_ATTRIBUTE_NAME_STATE);
        } else if (cp === $.AMPERSAND) {
            this.returnState = ATTRIBUTE_VALUE_UNQUOTED_STATE;
            this.state = CHARACTER_REFERENCE_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._leaveAttrValue(DATA_STATE);
            this._emitCurrentToken();
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentAttr.value += unicode.REPLACEMENT_CHARACTER;
        } else if (
            cp === $.QUOTATION_MARK ||
            cp === $.APOSTROPHE ||
            cp === $.LESS_THAN_SIGN ||
            cp === $.EQUALS_SIGN ||
            cp === $.GRAVE_ACCENT
        ) {
            this._err(ERR.unexpectedCharacterInUnquotedAttributeValue);
            this.currentAttr.value += toChar(cp);
        } else if (cp === $.EOF) {
            this._err(ERR.eofInTag);
            this._emitEOFToken();
        } else {
            this.currentAttr.value += toChar(cp);
        }
    }

    // After attribute value (quoted) state
    //------------------------------------------------------------------
    [AFTER_ATTRIBUTE_VALUE_QUOTED_STATE](cp) {
        if (isWhitespace(cp)) {
            this._leaveAttrValue(BEFORE_ATTRIBUTE_NAME_STATE);
        } else if (cp === $.SOLIDUS) {
            this._leaveAttrValue(SELF_CLOSING_START_TAG_STATE);
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._leaveAttrValue(DATA_STATE);
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInTag);
            this._emitEOFToken();
        } else {
            this._err(ERR.missingWhitespaceBetweenAttributes);
            this._reconsumeInState(BEFORE_ATTRIBUTE_NAME_STATE);
        }
    }

    // Self-closing start tag state
    //------------------------------------------------------------------
    [SELF_CLOSING_START_TAG_STATE](cp) {
        if (cp === $.GREATER_THAN_SIGN) {
            this.currentToken.selfClosing = true;
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInTag);
            this._emitEOFToken();
        } else {
            this._err(ERR.unexpectedSolidusInTag);
            this._reconsumeInState(BEFORE_ATTRIBUTE_NAME_STATE);
        }
    }

    // Bogus comment state
    //------------------------------------------------------------------
    [BOGUS_COMMENT_STATE](cp) {
        if (cp === $.GREATER_THAN_SIGN) {
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._emitCurrentToken();
            this._emitEOFToken();
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentToken.data += unicode.REPLACEMENT_CHARACTER;
        } else {
            this.currentToken.data += toChar(cp);
        }
    }

    // Markup declaration open state
    //------------------------------------------------------------------
    [MARKUP_DECLARATION_OPEN_STATE](cp) {
        if (this._consumeSequenceIfMatch($$.DASH_DASH_STRING, cp, true)) {
            this._createCommentToken();
            this.state = COMMENT_START_STATE;
        } else if (this._consumeSequenceIfMatch($$.DOCTYPE_STRING, cp, false)) {
            this.state = DOCTYPE_STATE;
        } else if (this._consumeSequenceIfMatch($$.CDATA_START_STRING, cp, true)) {
            if (this.allowCDATA) {
                this.state = CDATA_SECTION_STATE;
            } else {
                this._err(ERR.cdataInHtmlContent);
                this._createCommentToken();
                this.currentToken.data = '[CDATA[';
                this.state = BOGUS_COMMENT_STATE;
            }
        }

        //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.incorrectlyOpenedComment);
            this._createCommentToken();
            this._reconsumeInState(BOGUS_COMMENT_STATE);
        }
    }

    // Comment start state
    //------------------------------------------------------------------
    [COMMENT_START_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = COMMENT_START_DASH_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.abruptClosingOfEmptyComment);
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else {
            this._reconsumeInState(COMMENT_STATE);
        }
    }

    // Comment start dash state
    //------------------------------------------------------------------
    [COMMENT_START_DASH_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = COMMENT_END_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.abruptClosingOfEmptyComment);
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInComment);
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.data += '-';
            this._reconsumeInState(COMMENT_STATE);
        }
    }

    // Comment state
    //------------------------------------------------------------------
    [COMMENT_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = COMMENT_END_DASH_STATE;
        } else if (cp === $.LESS_THAN_SIGN) {
            this.currentToken.data += '<';
            this.state = COMMENT_LESS_THAN_SIGN_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentToken.data += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInComment);
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.data += toChar(cp);
        }
    }

    // Comment less-than sign state
    //------------------------------------------------------------------
    [COMMENT_LESS_THAN_SIGN_STATE](cp) {
        if (cp === $.EXCLAMATION_MARK) {
            this.currentToken.data += '!';
            this.state = COMMENT_LESS_THAN_SIGN_BANG_STATE;
        } else if (cp === $.LESS_THAN_SIGN) {
            this.currentToken.data += '!';
        } else {
            this._reconsumeInState(COMMENT_STATE);
        }
    }

    // Comment less-than sign bang state
    //------------------------------------------------------------------
    [COMMENT_LESS_THAN_SIGN_BANG_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = COMMENT_LESS_THAN_SIGN_BANG_DASH_STATE;
        } else {
            this._reconsumeInState(COMMENT_STATE);
        }
    }

    // Comment less-than sign bang dash state
    //------------------------------------------------------------------
    [COMMENT_LESS_THAN_SIGN_BANG_DASH_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH_STATE;
        } else {
            this._reconsumeInState(COMMENT_END_DASH_STATE);
        }
    }

    // Comment less-than sign bang dash dash state
    //------------------------------------------------------------------
    [COMMENT_LESS_THAN_SIGN_BANG_DASH_DASH_STATE](cp) {
        if (cp !== $.GREATER_THAN_SIGN && cp !== $.EOF) {
            this._err(ERR.nestedComment);
        }

        this._reconsumeInState(COMMENT_END_STATE);
    }

    // Comment end dash state
    //------------------------------------------------------------------
    [COMMENT_END_DASH_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.state = COMMENT_END_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInComment);
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.data += '-';
            this._reconsumeInState(COMMENT_STATE);
        }
    }

    // Comment end state
    //------------------------------------------------------------------
    [COMMENT_END_STATE](cp) {
        if (cp === $.GREATER_THAN_SIGN) {
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EXCLAMATION_MARK) {
            this.state = COMMENT_END_BANG_STATE;
        } else if (cp === $.HYPHEN_MINUS) {
            this.currentToken.data += '-';
        } else if (cp === $.EOF) {
            this._err(ERR.eofInComment);
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.data += '--';
            this._reconsumeInState(COMMENT_STATE);
        }
    }

    // Comment end bang state
    //------------------------------------------------------------------
    [COMMENT_END_BANG_STATE](cp) {
        if (cp === $.HYPHEN_MINUS) {
            this.currentToken.data += '--!';
            this.state = COMMENT_END_DASH_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.incorrectlyClosedComment);
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInComment);
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.data += '--!';
            this._reconsumeInState(COMMENT_STATE);
        }
    }

    // DOCTYPE state
    //------------------------------------------------------------------
    [DOCTYPE_STATE](cp) {
        if (isWhitespace(cp)) {
            this.state = BEFORE_DOCTYPE_NAME_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._reconsumeInState(BEFORE_DOCTYPE_NAME_STATE);
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this._createDoctypeToken(null);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._err(ERR.missingWhitespaceBeforeDoctypeName);
            this._reconsumeInState(BEFORE_DOCTYPE_NAME_STATE);
        }
    }

    // Before DOCTYPE name state
    //------------------------------------------------------------------
    [BEFORE_DOCTYPE_NAME_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (isAsciiUpper(cp)) {
            this._createDoctypeToken(toAsciiLowerChar(cp));
            this.state = DOCTYPE_NAME_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this._createDoctypeToken(unicode.REPLACEMENT_CHARACTER);
            this.state = DOCTYPE_NAME_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.missingDoctypeName);
            this._createDoctypeToken(null);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this.state = DATA_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this._createDoctypeToken(null);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._createDoctypeToken(toChar(cp));
            this.state = DOCTYPE_NAME_STATE;
        }
    }

    // DOCTYPE name state
    //------------------------------------------------------------------
    [DOCTYPE_NAME_STATE](cp) {
        if (isWhitespace(cp)) {
            this.state = AFTER_DOCTYPE_NAME_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (isAsciiUpper(cp)) {
            this.currentToken.name += toAsciiLowerChar(cp);
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentToken.name += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.name += toChar(cp);
        }
    }

    // After DOCTYPE name state
    //------------------------------------------------------------------
    [AFTER_DOCTYPE_NAME_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (cp === $.GREATER_THAN_SIGN) {
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else if (this._consumeSequenceIfMatch($$.PUBLIC_STRING, cp, false)) {
            this.state = AFTER_DOCTYPE_PUBLIC_KEYWORD_STATE;
        } else if (this._consumeSequenceIfMatch($$.SYSTEM_STRING, cp, false)) {
            this.state = AFTER_DOCTYPE_SYSTEM_KEYWORD_STATE;
        }
        //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);
            this.currentToken.forceQuirks = true;
            this._reconsumeInState(BOGUS_DOCTYPE_STATE);
        }
    }

    // After DOCTYPE public keyword state
    //------------------------------------------------------------------
    [AFTER_DOCTYPE_PUBLIC_KEYWORD_STATE](cp) {
        if (isWhitespace(cp)) {
            this.state = BEFORE_DOCTYPE_PUBLIC_IDENTIFIER_STATE;
        } else if (cp === $.QUOTATION_MARK) {
            this._err(ERR.missingWhitespaceAfterDoctypePublicKeyword);
            this.currentToken.publicId = '';
            this.state = DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED_STATE;
        } else if (cp === $.APOSTROPHE) {
            this._err(ERR.missingWhitespaceAfterDoctypePublicKeyword);
            this.currentToken.publicId = '';
            this.state = DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.missingDoctypePublicIdentifier);
            this.currentToken.forceQuirks = true;
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._err(ERR.missingQuoteBeforeDoctypePublicIdentifier);
            this.currentToken.forceQuirks = true;
            this._reconsumeInState(BOGUS_DOCTYPE_STATE);
        }
    }

    // Before DOCTYPE public identifier state
    //------------------------------------------------------------------
    [BEFORE_DOCTYPE_PUBLIC_IDENTIFIER_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (cp === $.QUOTATION_MARK) {
            this.currentToken.publicId = '';
            this.state = DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED_STATE;
        } else if (cp === $.APOSTROPHE) {
            this.currentToken.publicId = '';
            this.state = DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.missingDoctypePublicIdentifier);
            this.currentToken.forceQuirks = true;
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._err(ERR.missingQuoteBeforeDoctypePublicIdentifier);
            this.currentToken.forceQuirks = true;
            this._reconsumeInState(BOGUS_DOCTYPE_STATE);
        }
    }

    // DOCTYPE public identifier (double-quoted) state
    //------------------------------------------------------------------
    [DOCTYPE_PUBLIC_IDENTIFIER_DOUBLE_QUOTED_STATE](cp) {
        if (cp === $.QUOTATION_MARK) {
            this.state = AFTER_DOCTYPE_PUBLIC_IDENTIFIER_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentToken.publicId += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.abruptDoctypePublicIdentifier);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this.state = DATA_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.publicId += toChar(cp);
        }
    }

    // DOCTYPE public identifier (single-quoted) state
    //------------------------------------------------------------------
    [DOCTYPE_PUBLIC_IDENTIFIER_SINGLE_QUOTED_STATE](cp) {
        if (cp === $.APOSTROPHE) {
            this.state = AFTER_DOCTYPE_PUBLIC_IDENTIFIER_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentToken.publicId += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.abruptDoctypePublicIdentifier);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this.state = DATA_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.publicId += toChar(cp);
        }
    }

    // After DOCTYPE public identifier state
    //------------------------------------------------------------------
    [AFTER_DOCTYPE_PUBLIC_IDENTIFIER_STATE](cp) {
        if (isWhitespace(cp)) {
            this.state = BETWEEN_DOCTYPE_PUBLIC_AND_SYSTEM_IDENTIFIERS_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.QUOTATION_MARK) {
            this._err(ERR.missingWhitespaceBetweenDoctypePublicAndSystemIdentifiers);
            this.currentToken.systemId = '';
            this.state = DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED_STATE;
        } else if (cp === $.APOSTROPHE) {
            this._err(ERR.missingWhitespaceBetweenDoctypePublicAndSystemIdentifiers);
            this.currentToken.systemId = '';
            this.state = DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._err(ERR.missingQuoteBeforeDoctypeSystemIdentifier);
            this.currentToken.forceQuirks = true;
            this._reconsumeInState(BOGUS_DOCTYPE_STATE);
        }
    }

    // Between DOCTYPE public and system identifiers state
    //------------------------------------------------------------------
    [BETWEEN_DOCTYPE_PUBLIC_AND_SYSTEM_IDENTIFIERS_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (cp === $.GREATER_THAN_SIGN) {
            this._emitCurrentToken();
            this.state = DATA_STATE;
        } else if (cp === $.QUOTATION_MARK) {
            this.currentToken.systemId = '';
            this.state = DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED_STATE;
        } else if (cp === $.APOSTROPHE) {
            this.currentToken.systemId = '';
            this.state = DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._err(ERR.missingQuoteBeforeDoctypeSystemIdentifier);
            this.currentToken.forceQuirks = true;
            this._reconsumeInState(BOGUS_DOCTYPE_STATE);
        }
    }

    // After DOCTYPE system keyword state
    //------------------------------------------------------------------
    [AFTER_DOCTYPE_SYSTEM_KEYWORD_STATE](cp) {
        if (isWhitespace(cp)) {
            this.state = BEFORE_DOCTYPE_SYSTEM_IDENTIFIER_STATE;
        } else if (cp === $.QUOTATION_MARK) {
            this._err(ERR.missingWhitespaceAfterDoctypeSystemKeyword);
            this.currentToken.systemId = '';
            this.state = DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED_STATE;
        } else if (cp === $.APOSTROPHE) {
            this._err(ERR.missingWhitespaceAfterDoctypeSystemKeyword);
            this.currentToken.systemId = '';
            this.state = DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.missingDoctypeSystemIdentifier);
            this.currentToken.forceQuirks = true;
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._err(ERR.missingQuoteBeforeDoctypeSystemIdentifier);
            this.currentToken.forceQuirks = true;
            this._reconsumeInState(BOGUS_DOCTYPE_STATE);
        }
    }

    // Before DOCTYPE system identifier state
    //------------------------------------------------------------------
    [BEFORE_DOCTYPE_SYSTEM_IDENTIFIER_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (cp === $.QUOTATION_MARK) {
            this.currentToken.systemId = '';
            this.state = DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED_STATE;
        } else if (cp === $.APOSTROPHE) {
            this.currentToken.systemId = '';
            this.state = DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED_STATE;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.missingDoctypeSystemIdentifier);
            this.currentToken.forceQuirks = true;
            this.state = DATA_STATE;
            this._emitCurrentToken();
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._err(ERR.missingQuoteBeforeDoctypeSystemIdentifier);
            this.currentToken.forceQuirks = true;
            this._reconsumeInState(BOGUS_DOCTYPE_STATE);
        }
    }

    // DOCTYPE system identifier (double-quoted) state
    //------------------------------------------------------------------
    [DOCTYPE_SYSTEM_IDENTIFIER_DOUBLE_QUOTED_STATE](cp) {
        if (cp === $.QUOTATION_MARK) {
            this.state = AFTER_DOCTYPE_SYSTEM_IDENTIFIER_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentToken.systemId += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.abruptDoctypeSystemIdentifier);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this.state = DATA_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.systemId += toChar(cp);
        }
    }

    // DOCTYPE system identifier (single-quoted) state
    //------------------------------------------------------------------
    [DOCTYPE_SYSTEM_IDENTIFIER_SINGLE_QUOTED_STATE](cp) {
        if (cp === $.APOSTROPHE) {
            this.state = AFTER_DOCTYPE_SYSTEM_IDENTIFIER_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
            this.currentToken.systemId += unicode.REPLACEMENT_CHARACTER;
        } else if (cp === $.GREATER_THAN_SIGN) {
            this._err(ERR.abruptDoctypeSystemIdentifier);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this.state = DATA_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this.currentToken.systemId += toChar(cp);
        }
    }

    // After DOCTYPE system identifier state
    //------------------------------------------------------------------
    [AFTER_DOCTYPE_SYSTEM_IDENTIFIER_STATE](cp) {
        if (isWhitespace(cp)) {
            return;
        }

        if (cp === $.GREATER_THAN_SIGN) {
            this._emitCurrentToken();
            this.state = DATA_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInDoctype);
            this.currentToken.forceQuirks = true;
            this._emitCurrentToken();
            this._emitEOFToken();
        } else {
            this._err(ERR.unexpectedCharacterAfterDoctypeSystemIdentifier);
            this._reconsumeInState(BOGUS_DOCTYPE_STATE);
        }
    }

    // Bogus DOCTYPE state
    //------------------------------------------------------------------
    [BOGUS_DOCTYPE_STATE](cp) {
        if (cp === $.GREATER_THAN_SIGN) {
            this._emitCurrentToken();
            this.state = DATA_STATE;
        } else if (cp === $.NULL) {
            this._err(ERR.unexpectedNullCharacter);
        } else if (cp === $.EOF) {
            this._emitCurrentToken();
            this._emitEOFToken();
        }
    }

    // CDATA section state
    //------------------------------------------------------------------
    [CDATA_SECTION_STATE](cp) {
        if (cp === $.RIGHT_SQUARE_BRACKET) {
            this.state = CDATA_SECTION_BRACKET_STATE;
        } else if (cp === $.EOF) {
            this._err(ERR.eofInCdata);
            this._emitEOFToken();
        } else {
            this._emitCodePoint(cp);
        }
    }

    // CDATA section bracket state
    //------------------------------------------------------------------
    [CDATA_SECTION_BRACKET_STATE](cp) {
        if (cp === $.RIGHT_SQUARE_BRACKET) {
            this.state = CDATA_SECTION_END_STATE;
        } else {
            this._emitChars(']');
            this._reconsumeInState(CDATA_SECTION_STATE);
        }
    }

    // CDATA section end state
    //------------------------------------------------------------------
    [CDATA_SECTION_END_STATE](cp) {
        if (cp === $.GREATER_THAN_SIGN) {
            this.state = DATA_STATE;
        } else if (cp === $.RIGHT_SQUARE_BRACKET) {
            this._emitChars(']');
        } else {
            this._emitChars(']]');
            this._reconsumeInState(CDATA_SECTION_STATE);
        }
    }

    // Character reference state
    //------------------------------------------------------------------
    [CHARACTER_REFERENCE_STATE](cp) {
        this.tempBuff = [$.AMPERSAND];

        if (cp === $.NUMBER_SIGN) {
            this.tempBuff.push(cp);
            this.state = NUMERIC_CHARACTER_REFERENCE_STATE;
        } else if (isAsciiAlphaNumeric(cp)) {
            this._reconsumeInState(NAMED_CHARACTER_REFERENCE_STATE);
        } else {
            this._flushCodePointsConsumedAsCharacterReference();
            this._reconsumeInState(this.returnState);
        }
    }

    // Named character reference state
    //------------------------------------------------------------------
    [NAMED_CHARACTER_REFERENCE_STATE](cp) {
        const matchResult = this._matchNamedCharacterReference(cp);

        //NOTE: matching can be abrupted by hibernation. In that case match
        //results are no longer valid and we will need to start over.
        if (this._ensureHibernation()) {
            this.tempBuff = [$.AMPERSAND];
        } else if (matchResult) {
            const withSemicolon = this.tempBuff[this.tempBuff.length - 1] === $.SEMICOLON;

            if (!this._isCharacterReferenceAttributeQuirk(withSemicolon)) {
                if (!withSemicolon) {
                    this._errOnNextCodePoint(ERR.missingSemicolonAfterCharacterReference);
                }

                this.tempBuff = matchResult;
            }

            this._flushCodePointsConsumedAsCharacterReference();
            this.state = this.returnState;
        } else {
            this._flushCodePointsConsumedAsCharacterReference();
            this.state = AMBIGUOUS_AMPERSAND_STATE;
        }
    }

    // Ambiguos ampersand state
    //------------------------------------------------------------------
    [AMBIGUOUS_AMPERSAND_STATE](cp) {
        if (isAsciiAlphaNumeric(cp)) {
            if (this._isCharacterReferenceInAttribute()) {
                this.currentAttr.value += toChar(cp);
            } else {
                this._emitCodePoint(cp);
            }
        } else {
            if (cp === $.SEMICOLON) {
                this._err(ERR.unknownNamedCharacterReference);
            }

            this._reconsumeInState(this.returnState);
        }
    }

    // Numeric character reference state
    //------------------------------------------------------------------
    [NUMERIC_CHARACTER_REFERENCE_STATE](cp) {
        this.charRefCode = 0;

        if (cp === $.LATIN_SMALL_X || cp === $.LATIN_CAPITAL_X) {
            this.tempBuff.push(cp);
            this.state = HEXADEMICAL_CHARACTER_REFERENCE_START_STATE;
        } else {
            this._reconsumeInState(DECIMAL_CHARACTER_REFERENCE_START_STATE);
        }
    }

    // Hexademical character reference start state
    //------------------------------------------------------------------
    [HEXADEMICAL_CHARACTER_REFERENCE_START_STATE](cp) {
        if (isAsciiHexDigit(cp)) {
            this._reconsumeInState(HEXADEMICAL_CHARACTER_REFERENCE_STATE);
        } else {
            this._err(ERR.absenceOfDigitsInNumericCharacterReference);
            this._flushCodePointsConsumedAsCharacterReference();
            this._reconsumeInState(this.returnState);
        }
    }

    // Decimal character reference start state
    //------------------------------------------------------------------
    [DECIMAL_CHARACTER_REFERENCE_START_STATE](cp) {
        if (isAsciiDigit(cp)) {
            this._reconsumeInState(DECIMAL_CHARACTER_REFERENCE_STATE);
        } else {
            this._err(ERR.absenceOfDigitsInNumericCharacterReference);
            this._flushCodePointsConsumedAsCharacterReference();
            this._reconsumeInState(this.returnState);
        }
    }

    // Hexademical character reference state
    //------------------------------------------------------------------
    [HEXADEMICAL_CHARACTER_REFERENCE_STATE](cp) {
        if (isAsciiUpperHexDigit(cp)) {
            this.charRefCode = this.charRefCode * 16 + cp - 0x37;
        } else if (isAsciiLowerHexDigit(cp)) {
            this.charRefCode = this.charRefCode * 16 + cp - 0x57;
        } else if (isAsciiDigit(cp)) {
            this.charRefCode = this.charRefCode * 16 + cp - 0x30;
        } else if (cp === $.SEMICOLON) {
            this.state = NUMERIC_CHARACTER_REFERENCE_END_STATE;
        } else {
            this._err(ERR.missingSemicolonAfterCharacterReference);
            this._reconsumeInState(NUMERIC_CHARACTER_REFERENCE_END_STATE);
        }
    }

    // Decimal character reference state
    //------------------------------------------------------------------
    [DECIMAL_CHARACTER_REFERENCE_STATE](cp) {
        if (isAsciiDigit(cp)) {
            this.charRefCode = this.charRefCode * 10 + cp - 0x30;
        } else if (cp === $.SEMICOLON) {
            this.state = NUMERIC_CHARACTER_REFERENCE_END_STATE;
        } else {
            this._err(ERR.missingSemicolonAfterCharacterReference);
            this._reconsumeInState(NUMERIC_CHARACTER_REFERENCE_END_STATE);
        }
    }

    // Numeric character reference end state
    //------------------------------------------------------------------
    [NUMERIC_CHARACTER_REFERENCE_END_STATE]() {
        if (this.charRefCode === $.NULL) {
            this._err(ERR.nullCharacterReference);
            this.charRefCode = $.REPLACEMENT_CHARACTER;
        } else if (this.charRefCode > 0x10ffff) {
            this._err(ERR.characterReferenceOutsideUnicodeRange);
            this.charRefCode = $.REPLACEMENT_CHARACTER;
        } else if (unicode.isSurrogate(this.charRefCode)) {
            this._err(ERR.surrogateCharacterReference);
            this.charRefCode = $.REPLACEMENT_CHARACTER;
        } else if (unicode.isUndefinedCodePoint(this.charRefCode)) {
            this._err(ERR.noncharacterCharacterReference);
        } else if (unicode.isControlCodePoint(this.charRefCode) || this.charRefCode === $.CARRIAGE_RETURN) {
            this._err(ERR.controlCharacterReference);

            const replacement = C1_CONTROLS_REFERENCE_REPLACEMENTS[this.charRefCode];

            if (replacement) {
                this.charRefCode = replacement;
            }
        }

        this.tempBuff = [this.charRefCode];

        this._flushCodePointsConsumedAsCharacterReference();
        this._reconsumeInState(this.returnState);
    }
}

//Token types
Tokenizer.CHARACTER_TOKEN = 'CHARACTER_TOKEN';
Tokenizer.NULL_CHARACTER_TOKEN = 'NULL_CHARACTER_TOKEN';
Tokenizer.WHITESPACE_CHARACTER_TOKEN = 'WHITESPACE_CHARACTER_TOKEN';
Tokenizer.START_TAG_TOKEN = 'START_TAG_TOKEN';
Tokenizer.END_TAG_TOKEN = 'END_TAG_TOKEN';
Tokenizer.COMMENT_TOKEN = 'COMMENT_TOKEN';
Tokenizer.DOCTYPE_TOKEN = 'DOCTYPE_TOKEN';
Tokenizer.EOF_TOKEN = 'EOF_TOKEN';
Tokenizer.HIBERNATION_TOKEN = 'HIBERNATION_TOKEN';

//Tokenizer initial states for different modes
Tokenizer.MODE = {
    DATA: DATA_STATE,
    RCDATA: RCDATA_STATE,
    RAWTEXT: RAWTEXT_STATE,
    SCRIPT_DATA: SCRIPT_DATA_STATE,
    PLAINTEXT: PLAINTEXT_STATE
};

//Static
Tokenizer.getTokenAttr = function(token, attrName) {
    for (let i = token.attrs.length - 1; i >= 0; i--) {
        if (token.attrs[i].name === attrName) {
            return token.attrs[i].value;
        }
    }

    return null;
};

module.exports = Tokenizer;