(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define(["require", "exports"], factory);
    }
})(function (require, exports) {
    /*---------------------------------------------------------------------------------------------
     *  Copyright (c) Microsoft Corporation. All rights reserved.
     *  Licensed under the MIT License. See License.txt in the project root for license information.
     *--------------------------------------------------------------------------------------------*/
    'use strict';
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.Scanner = exports.MultiLineStream = exports.TokenType = void 0;
    var TokenType;
    (function (TokenType) {
        TokenType[TokenType["Ident"] = 0] = "Ident";
        TokenType[TokenType["AtKeyword"] = 1] = "AtKeyword";
        TokenType[TokenType["String"] = 2] = "String";
        TokenType[TokenType["BadString"] = 3] = "BadString";
        TokenType[TokenType["UnquotedString"] = 4] = "UnquotedString";
        TokenType[TokenType["Hash"] = 5] = "Hash";
        TokenType[TokenType["Num"] = 6] = "Num";
        TokenType[TokenType["Percentage"] = 7] = "Percentage";
        TokenType[TokenType["Dimension"] = 8] = "Dimension";
        TokenType[TokenType["UnicodeRange"] = 9] = "UnicodeRange";
        TokenType[TokenType["CDO"] = 10] = "CDO";
        TokenType[TokenType["CDC"] = 11] = "CDC";
        TokenType[TokenType["Colon"] = 12] = "Colon";
        TokenType[TokenType["SemiColon"] = 13] = "SemiColon";
        TokenType[TokenType["CurlyL"] = 14] = "CurlyL";
        TokenType[TokenType["CurlyR"] = 15] = "CurlyR";
        TokenType[TokenType["ParenthesisL"] = 16] = "ParenthesisL";
        TokenType[TokenType["ParenthesisR"] = 17] = "ParenthesisR";
        TokenType[TokenType["BracketL"] = 18] = "BracketL";
        TokenType[TokenType["BracketR"] = 19] = "BracketR";
        TokenType[TokenType["Whitespace"] = 20] = "Whitespace";
        TokenType[TokenType["Includes"] = 21] = "Includes";
        TokenType[TokenType["Dashmatch"] = 22] = "Dashmatch";
        TokenType[TokenType["SubstringOperator"] = 23] = "SubstringOperator";
        TokenType[TokenType["PrefixOperator"] = 24] = "PrefixOperator";
        TokenType[TokenType["SuffixOperator"] = 25] = "SuffixOperator";
        TokenType[TokenType["Delim"] = 26] = "Delim";
        TokenType[TokenType["EMS"] = 27] = "EMS";
        TokenType[TokenType["EXS"] = 28] = "EXS";
        TokenType[TokenType["Length"] = 29] = "Length";
        TokenType[TokenType["Angle"] = 30] = "Angle";
        TokenType[TokenType["Time"] = 31] = "Time";
        TokenType[TokenType["Freq"] = 32] = "Freq";
        TokenType[TokenType["Exclamation"] = 33] = "Exclamation";
        TokenType[TokenType["Resolution"] = 34] = "Resolution";
        TokenType[TokenType["Comma"] = 35] = "Comma";
        TokenType[TokenType["Charset"] = 36] = "Charset";
        TokenType[TokenType["EscapedJavaScript"] = 37] = "EscapedJavaScript";
        TokenType[TokenType["BadEscapedJavaScript"] = 38] = "BadEscapedJavaScript";
        TokenType[TokenType["Comment"] = 39] = "Comment";
        TokenType[TokenType["SingleLineComment"] = 40] = "SingleLineComment";
        TokenType[TokenType["EOF"] = 41] = "EOF";
        TokenType[TokenType["CustomToken"] = 42] = "CustomToken";
    })(TokenType || (exports.TokenType = TokenType = {}));
    class MultiLineStream {
        constructor(source) {
            this.source = source;
            this.len = source.length;
            this.position = 0;
        }
        substring(from, to = this.position) {
            return this.source.substring(from, to);
        }
        eos() {
            return this.len <= this.position;
        }
        pos() {
            return this.position;
        }
        goBackTo(pos) {
            this.position = pos;
        }
        goBack(n) {
            this.position -= n;
        }
        advance(n) {
            this.position += n;
        }
        nextChar() {
            return this.source.charCodeAt(this.position++) || 0;
        }
        peekChar(n = 0) {
            return this.source.charCodeAt(this.position + n) || 0;
        }
        lookbackChar(n = 0) {
            return this.source.charCodeAt(this.position - n) || 0;
        }
        advanceIfChar(ch) {
            if (ch === this.source.charCodeAt(this.position)) {
                this.position++;
                return true;
            }
            return false;
        }
        advanceIfChars(ch) {
            if (this.position + ch.length > this.source.length) {
                return false;
            }
            let i = 0;
            for (; i < ch.length; i++) {
                if (this.source.charCodeAt(this.position + i) !== ch[i]) {
                    return false;
                }
            }
            this.advance(i);
            return true;
        }
        advanceWhileChar(condition) {
            const posNow = this.position;
            while (this.position < this.len && condition(this.source.charCodeAt(this.position))) {
                this.position++;
            }
            return this.position - posNow;
        }
    }
    exports.MultiLineStream = MultiLineStream;
    const _a = 'a'.charCodeAt(0);
    const _f = 'f'.charCodeAt(0);
    const _z = 'z'.charCodeAt(0);
    const _u = 'u'.charCodeAt(0);
    const _A = 'A'.charCodeAt(0);
    const _F = 'F'.charCodeAt(0);
    const _Z = 'Z'.charCodeAt(0);
    const _0 = '0'.charCodeAt(0);
    const _9 = '9'.charCodeAt(0);
    const _TLD = '~'.charCodeAt(0);
    const _HAT = '^'.charCodeAt(0);
    const _EQS = '='.charCodeAt(0);
    const _PIP = '|'.charCodeAt(0);
    const _MIN = '-'.charCodeAt(0);
    const _USC = '_'.charCodeAt(0);
    const _PRC = '%'.charCodeAt(0);
    const _MUL = '*'.charCodeAt(0);
    const _LPA = '('.charCodeAt(0);
    const _RPA = ')'.charCodeAt(0);
    const _LAN = '<'.charCodeAt(0);
    const _RAN = '>'.charCodeAt(0);
    const _ATS = '@'.charCodeAt(0);
    const _HSH = '#'.charCodeAt(0);
    const _DLR = '$'.charCodeAt(0);
    const _BSL = '\\'.charCodeAt(0);
    const _FSL = '/'.charCodeAt(0);
    const _NWL = '\n'.charCodeAt(0);
    const _CAR = '\r'.charCodeAt(0);
    const _LFD = '\f'.charCodeAt(0);
    const _DQO = '"'.charCodeAt(0);
    const _SQO = '\''.charCodeAt(0);
    const _WSP = ' '.charCodeAt(0);
    const _TAB = '\t'.charCodeAt(0);
    const _SEM = ';'.charCodeAt(0);
    const _COL = ':'.charCodeAt(0);
    const _CUL = '{'.charCodeAt(0);
    const _CUR = '}'.charCodeAt(0);
    const _BRL = '['.charCodeAt(0);
    const _BRR = ']'.charCodeAt(0);
    const _CMA = ','.charCodeAt(0);
    const _DOT = '.'.charCodeAt(0);
    const _BNG = '!'.charCodeAt(0);
    const _QSM = '?'.charCodeAt(0);
    const _PLS = '+'.charCodeAt(0);
    const staticTokenTable = {};
    staticTokenTable[_SEM] = TokenType.SemiColon;
    staticTokenTable[_COL] = TokenType.Colon;
    staticTokenTable[_CUL] = TokenType.CurlyL;
    staticTokenTable[_CUR] = TokenType.CurlyR;
    staticTokenTable[_BRR] = TokenType.BracketR;
    staticTokenTable[_BRL] = TokenType.BracketL;
    staticTokenTable[_LPA] = TokenType.ParenthesisL;
    staticTokenTable[_RPA] = TokenType.ParenthesisR;
    staticTokenTable[_CMA] = TokenType.Comma;
    const staticUnitTable = {};
    staticUnitTable['em'] = TokenType.EMS;
    staticUnitTable['ex'] = TokenType.EXS;
    staticUnitTable['px'] = TokenType.Length;
    staticUnitTable['cm'] = TokenType.Length;
    staticUnitTable['mm'] = TokenType.Length;
    staticUnitTable['in'] = TokenType.Length;
    staticUnitTable['pt'] = TokenType.Length;
    staticUnitTable['pc'] = TokenType.Length;
    staticUnitTable['deg'] = TokenType.Angle;
    staticUnitTable['rad'] = TokenType.Angle;
    staticUnitTable['grad'] = TokenType.Angle;
    staticUnitTable['ms'] = TokenType.Time;
    staticUnitTable['s'] = TokenType.Time;
    staticUnitTable['hz'] = TokenType.Freq;
    staticUnitTable['khz'] = TokenType.Freq;
    staticUnitTable['%'] = TokenType.Percentage;
    staticUnitTable['fr'] = TokenType.Percentage;
    staticUnitTable['dpi'] = TokenType.Resolution;
    staticUnitTable['dpcm'] = TokenType.Resolution;
    class Scanner {
        constructor() {
            this.stream = new MultiLineStream('');
            this.ignoreComment = true;
            this.ignoreWhitespace = true;
            this.inURL = false;
        }
        setSource(input) {
            this.stream = new MultiLineStream(input);
        }
        finishToken(offset, type, text) {
            return {
                offset: offset,
                len: this.stream.pos() - offset,
                type: type,
                text: text || this.stream.substring(offset)
            };
        }
        substring(offset, len) {
            return this.stream.substring(offset, offset + len);
        }
        pos() {
            return this.stream.pos();
        }
        goBackTo(pos) {
            this.stream.goBackTo(pos);
        }
        scanUnquotedString() {
            const offset = this.stream.pos();
            const content = [];
            if (this._unquotedString(content)) {
                return this.finishToken(offset, TokenType.UnquotedString, content.join(''));
            }
            return null;
        }
        scan() {
            // processes all whitespaces and comments
            const triviaToken = this.trivia();
            if (triviaToken !== null) {
                return triviaToken;
            }
            const offset = this.stream.pos();
            // End of file/input
            if (this.stream.eos()) {
                return this.finishToken(offset, TokenType.EOF);
            }
            return this.scanNext(offset);
        }
        /**
         * Read the range as described in https://www.w3.org/TR/CSS21/syndata.html#tokenization
         * Assume the `u` has aleady been consumed
         * @returns if reading the unicode was successful
         */
        tryScanUnicode() {
            const offset = this.stream.pos();
            if (!this.stream.eos() && this._unicodeRange()) {
                return this.finishToken(offset, TokenType.UnicodeRange);
            }
            this.stream.goBackTo(offset);
            return undefined;
        }
        scanNext(offset) {
            // CDO <!--
            if (this.stream.advanceIfChars([_LAN, _BNG, _MIN, _MIN])) {
                return this.finishToken(offset, TokenType.CDO);
            }
            // CDC -->
            if (this.stream.advanceIfChars([_MIN, _MIN, _RAN])) {
                return this.finishToken(offset, TokenType.CDC);
            }
            let content = [];
            if (this.ident(content)) {
                return this.finishToken(offset, TokenType.Ident, content.join(''));
            }
            // at-keyword
            if (this.stream.advanceIfChar(_ATS)) {
                content = ['@'];
                if (this._name(content)) {
                    const keywordText = content.join('');
                    if (keywordText === '@charset') {
                        return this.finishToken(offset, TokenType.Charset, keywordText);
                    }
                    return this.finishToken(offset, TokenType.AtKeyword, keywordText);
                }
                else {
                    return this.finishToken(offset, TokenType.Delim);
                }
            }
            // hash
            if (this.stream.advanceIfChar(_HSH)) {
                content = ['#'];
                if (this._name(content)) {
                    return this.finishToken(offset, TokenType.Hash, content.join(''));
                }
                else {
                    return this.finishToken(offset, TokenType.Delim);
                }
            }
            // Important
            if (this.stream.advanceIfChar(_BNG)) {
                return this.finishToken(offset, TokenType.Exclamation);
            }
            // Numbers
            if (this._number()) {
                const pos = this.stream.pos();
                content = [this.stream.substring(offset, pos)];
                if (this.stream.advanceIfChar(_PRC)) {
                    // Percentage 43%
                    return this.finishToken(offset, TokenType.Percentage);
                }
                else if (this.ident(content)) {
                    const dim = this.stream.substring(pos).toLowerCase();
                    const tokenType = staticUnitTable[dim];
                    if (typeof tokenType !== 'undefined') {
                        // Known dimension 43px
                        return this.finishToken(offset, tokenType, content.join(''));
                    }
                    else {
                        // Unknown dimension 43ft
                        return this.finishToken(offset, TokenType.Dimension, content.join(''));
                    }
                }
                return this.finishToken(offset, TokenType.Num);
            }
            // String, BadString
            content = [];
            let tokenType = this._string(content);
            if (tokenType !== null) {
                return this.finishToken(offset, tokenType, content.join(''));
            }
            // single character tokens
            tokenType = staticTokenTable[this.stream.peekChar()];
            if (typeof tokenType !== 'undefined') {
                this.stream.advance(1);
                return this.finishToken(offset, tokenType);
            }
            // includes ~=
            if (this.stream.peekChar(0) === _TLD && this.stream.peekChar(1) === _EQS) {
                this.stream.advance(2);
                return this.finishToken(offset, TokenType.Includes);
            }
            // DashMatch |=
            if (this.stream.peekChar(0) === _PIP && this.stream.peekChar(1) === _EQS) {
                this.stream.advance(2);
                return this.finishToken(offset, TokenType.Dashmatch);
            }
            // Substring operator *=
            if (this.stream.peekChar(0) === _MUL && this.stream.peekChar(1) === _EQS) {
                this.stream.advance(2);
                return this.finishToken(offset, TokenType.SubstringOperator);
            }
            // Substring operator ^=
            if (this.stream.peekChar(0) === _HAT && this.stream.peekChar(1) === _EQS) {
                this.stream.advance(2);
                return this.finishToken(offset, TokenType.PrefixOperator);
            }
            // Substring operator $=
            if (this.stream.peekChar(0) === _DLR && this.stream.peekChar(1) === _EQS) {
                this.stream.advance(2);
                return this.finishToken(offset, TokenType.SuffixOperator);
            }
            // Delim
            this.stream.nextChar();
            return this.finishToken(offset, TokenType.Delim);
        }
        trivia() {
            while (true) {
                const offset = this.stream.pos();
                if (this._whitespace()) {
                    if (!this.ignoreWhitespace) {
                        return this.finishToken(offset, TokenType.Whitespace);
                    }
                }
                else if (this.comment()) {
                    if (!this.ignoreComment) {
                        return this.finishToken(offset, TokenType.Comment);
                    }
                }
                else {
                    return null;
                }
            }
        }
        comment() {
            if (this.stream.advanceIfChars([_FSL, _MUL])) {
                let success = false, hot = false;
                this.stream.advanceWhileChar((ch) => {
                    if (hot && ch === _FSL) {
                        success = true;
                        return false;
                    }
                    hot = ch === _MUL;
                    return true;
                });
                if (success) {
                    this.stream.advance(1);
                }
                return true;
            }
            return false;
        }
        _number() {
            let npeek = 0, ch;
            if (this.stream.peekChar() === _DOT) {
                npeek = 1;
            }
            ch = this.stream.peekChar(npeek);
            if (ch >= _0 && ch <= _9) {
                this.stream.advance(npeek + 1);
                this.stream.advanceWhileChar((ch) => {
                    return ch >= _0 && ch <= _9 || npeek === 0 && ch === _DOT;
                });
                return true;
            }
            return false;
        }
        _newline(result) {
            const ch = this.stream.peekChar();
            switch (ch) {
                case _CAR:
                case _LFD:
                case _NWL:
                    this.stream.advance(1);
                    result.push(String.fromCharCode(ch));
                    if (ch === _CAR && this.stream.advanceIfChar(_NWL)) {
                        result.push('\n');
                    }
                    return true;
            }
            return false;
        }
        _escape(result, includeNewLines) {
            let ch = this.stream.peekChar();
            if (ch === _BSL) {
                this.stream.advance(1);
                ch = this.stream.peekChar();
                let hexNumCount = 0;
                while (hexNumCount < 6 && (ch >= _0 && ch <= _9 || ch >= _a && ch <= _f || ch >= _A && ch <= _F)) {
                    this.stream.advance(1);
                    ch = this.stream.peekChar();
                    hexNumCount++;
                }
                if (hexNumCount > 0) {
                    try {
                        const hexVal = parseInt(this.stream.substring(this.stream.pos() - hexNumCount), 16);
                        if (hexVal) {
                            result.push(String.fromCharCode(hexVal));
                        }
                    }
                    catch (e) {
                        // ignore
                    }
                    // optional whitespace or new line, not part of result text
                    if (ch === _WSP || ch === _TAB) {
                        this.stream.advance(1);
                    }
                    else {
                        this._newline([]);
                    }
                    return true;
                }
                if (ch !== _CAR && ch !== _LFD && ch !== _NWL) {
                    this.stream.advance(1);
                    result.push(String.fromCharCode(ch));
                    return true;
                }
                else if (includeNewLines) {
                    return this._newline(result);
                }
            }
            return false;
        }
        _stringChar(closeQuote, result) {
            // not closeQuote, not backslash, not newline
            const ch = this.stream.peekChar();
            if (ch !== 0 && ch !== closeQuote && ch !== _BSL && ch !== _CAR && ch !== _LFD && ch !== _NWL) {
                this.stream.advance(1);
                result.push(String.fromCharCode(ch));
                return true;
            }
            return false;
        }
        _string(result) {
            if (this.stream.peekChar() === _SQO || this.stream.peekChar() === _DQO) {
                const closeQuote = this.stream.nextChar();
                result.push(String.fromCharCode(closeQuote));
                while (this._stringChar(closeQuote, result) || this._escape(result, true)) {
                    // loop
                }
                if (this.stream.peekChar() === closeQuote) {
                    this.stream.nextChar();
                    result.push(String.fromCharCode(closeQuote));
                    return TokenType.String;
                }
                else {
                    return TokenType.BadString;
                }
            }
            return null;
        }
        _unquotedChar(result) {
            // not closeQuote, not backslash, not newline
            const ch = this.stream.peekChar();
            if (ch !== 0 && ch !== _BSL && ch !== _SQO && ch !== _DQO && ch !== _LPA && ch !== _RPA && ch !== _WSP && ch !== _TAB && ch !== _NWL && ch !== _LFD && ch !== _CAR) {
                this.stream.advance(1);
                result.push(String.fromCharCode(ch));
                return true;
            }
            return false;
        }
        _unquotedString(result) {
            let hasContent = false;
            while (this._unquotedChar(result) || this._escape(result)) {
                hasContent = true;
            }
            return hasContent;
        }
        _whitespace() {
            const n = this.stream.advanceWhileChar((ch) => {
                return ch === _WSP || ch === _TAB || ch === _NWL || ch === _LFD || ch === _CAR;
            });
            return n > 0;
        }
        _name(result) {
            let matched = false;
            while (this._identChar(result) || this._escape(result)) {
                matched = true;
            }
            return matched;
        }
        ident(result) {
            const pos = this.stream.pos();
            const hasMinus = this._minus(result);
            if (hasMinus) {
                if (this._minus(result) /* -- */ || this._identFirstChar(result) || this._escape(result)) {
                    while (this._identChar(result) || this._escape(result)) {
                        // loop
                    }
                    return true;
                }
            }
            else if (this._identFirstChar(result) || this._escape(result)) {
                while (this._identChar(result) || this._escape(result)) {
                    // loop
                }
                return true;
            }
            this.stream.goBackTo(pos);
            return false;
        }
        _identFirstChar(result) {
            const ch = this.stream.peekChar();
            if (ch === _USC || // _
                ch >= _a && ch <= _z || // a-z
                ch >= _A && ch <= _Z || // A-Z
                ch >= 0x80 && ch <= 0xFFFF) { // nonascii
                this.stream.advance(1);
                result.push(String.fromCharCode(ch));
                return true;
            }
            return false;
        }
        _minus(result) {
            const ch = this.stream.peekChar();
            if (ch === _MIN) {
                this.stream.advance(1);
                result.push(String.fromCharCode(ch));
                return true;
            }
            return false;
        }
        _identChar(result) {
            const ch = this.stream.peekChar();
            if (ch === _USC || // _
                ch === _MIN || // -
                ch >= _a && ch <= _z || // a-z
                ch >= _A && ch <= _Z || // A-Z
                ch >= _0 && ch <= _9 || // 0/9
                ch >= 0x80 && ch <= 0xFFFF) { // nonascii
                this.stream.advance(1);
                result.push(String.fromCharCode(ch));
                return true;
            }
            return false;
        }
        _unicodeRange() {
            // follow https://www.w3.org/TR/CSS21/syndata.html#tokenization and https://www.w3.org/TR/css-syntax-3/#urange-syntax
            // assume u has already been parsed
            if (this.stream.advanceIfChar(_PLS)) {
                const isHexDigit = (ch) => (ch >= _0 && ch <= _9 || ch >= _a && ch <= _f || ch >= _A && ch <= _F);
                const codePoints = this.stream.advanceWhileChar(isHexDigit) + this.stream.advanceWhileChar(ch => ch === _QSM);
                if (codePoints >= 1 && codePoints <= 6) {
                    if (this.stream.advanceIfChar(_MIN)) {
                        const digits = this.stream.advanceWhileChar(isHexDigit);
                        if (digits >= 1 && digits <= 6) {
                            return true;
                        }
                    }
                    else {
                        return true;
                    }
                }
            }
            return false;
        }
    }
    exports.Scanner = Scanner;
});
