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/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
(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("@angular/compiler/src/ml_parser/lexer", ["require", "exports", "tslib", "@angular/compiler/src/chars", "@angular/compiler/src/parse_util", "@angular/compiler/src/ml_parser/interpolation_config", "@angular/compiler/src/ml_parser/tags"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    var tslib_1 = require("tslib");
    var chars = require("@angular/compiler/src/chars");
    var parse_util_1 = require("@angular/compiler/src/parse_util");
    var interpolation_config_1 = require("@angular/compiler/src/ml_parser/interpolation_config");
    var tags_1 = require("@angular/compiler/src/ml_parser/tags");
    var TokenType;
    (function (TokenType) {
        TokenType[TokenType["TAG_OPEN_START"] = 0] = "TAG_OPEN_START";
        TokenType[TokenType["TAG_OPEN_END"] = 1] = "TAG_OPEN_END";
        TokenType[TokenType["TAG_OPEN_END_VOID"] = 2] = "TAG_OPEN_END_VOID";
        TokenType[TokenType["TAG_CLOSE"] = 3] = "TAG_CLOSE";
        TokenType[TokenType["TEXT"] = 4] = "TEXT";
        TokenType[TokenType["ESCAPABLE_RAW_TEXT"] = 5] = "ESCAPABLE_RAW_TEXT";
        TokenType[TokenType["RAW_TEXT"] = 6] = "RAW_TEXT";
        TokenType[TokenType["COMMENT_START"] = 7] = "COMMENT_START";
        TokenType[TokenType["COMMENT_END"] = 8] = "COMMENT_END";
        TokenType[TokenType["CDATA_START"] = 9] = "CDATA_START";
        TokenType[TokenType["CDATA_END"] = 10] = "CDATA_END";
        TokenType[TokenType["ATTR_NAME"] = 11] = "ATTR_NAME";
        TokenType[TokenType["ATTR_QUOTE"] = 12] = "ATTR_QUOTE";
        TokenType[TokenType["ATTR_VALUE"] = 13] = "ATTR_VALUE";
        TokenType[TokenType["DOC_TYPE"] = 14] = "DOC_TYPE";
        TokenType[TokenType["EXPANSION_FORM_START"] = 15] = "EXPANSION_FORM_START";
        TokenType[TokenType["EXPANSION_CASE_VALUE"] = 16] = "EXPANSION_CASE_VALUE";
        TokenType[TokenType["EXPANSION_CASE_EXP_START"] = 17] = "EXPANSION_CASE_EXP_START";
        TokenType[TokenType["EXPANSION_CASE_EXP_END"] = 18] = "EXPANSION_CASE_EXP_END";
        TokenType[TokenType["EXPANSION_FORM_END"] = 19] = "EXPANSION_FORM_END";
        TokenType[TokenType["EOF"] = 20] = "EOF";
    })(TokenType = exports.TokenType || (exports.TokenType = {}));
    var Token = /** @class */ (function () {
        function Token(type, parts, sourceSpan) {
            this.type = type;
            this.parts = parts;
            this.sourceSpan = sourceSpan;
        }
        return Token;
    }());
    exports.Token = Token;
    var TokenError = /** @class */ (function (_super) {
        tslib_1.__extends(TokenError, _super);
        function TokenError(errorMsg, tokenType, span) {
            var _this = _super.call(this, span, errorMsg) || this;
            _this.tokenType = tokenType;
            return _this;
        }
        return TokenError;
    }(parse_util_1.ParseError));
    exports.TokenError = TokenError;
    var TokenizeResult = /** @class */ (function () {
        function TokenizeResult(tokens, errors) {
            this.tokens = tokens;
            this.errors = errors;
        }
        return TokenizeResult;
    }());
    exports.TokenizeResult = TokenizeResult;
    function tokenize(source, url, getTagDefinition, options) {
        if (options === void 0) { options = {}; }
        return new _Tokenizer(new parse_util_1.ParseSourceFile(source, url), getTagDefinition, options).tokenize();
    }
    exports.tokenize = tokenize;
    var _CR_OR_CRLF_REGEXP = /\r\n?/g;
    function _unexpectedCharacterErrorMsg(charCode) {
        var char = charCode === chars.$EOF ? 'EOF' : String.fromCharCode(charCode);
        return "Unexpected character \"" + char + "\"";
    }
    function _unknownEntityErrorMsg(entitySrc) {
        return "Unknown entity \"" + entitySrc + "\" - use the \"&#<decimal>;\" or  \"&#x<hex>;\" syntax";
    }
    var _ControlFlowError = /** @class */ (function () {
        function _ControlFlowError(error) {
            this.error = error;
        }
        return _ControlFlowError;
    }());
    // See http://www.w3.org/TR/html51/syntax.html#writing
    var _Tokenizer = /** @class */ (function () {
        /**
         * @param _file The html source file being tokenized.
         * @param _getTagDefinition A function that will retrieve a tag definition for a given tag name.
         * @param options Configuration of the tokenization.
         */
        function _Tokenizer(_file, _getTagDefinition, options) {
            this._getTagDefinition = _getTagDefinition;
            this._currentTokenStart = null;
            this._currentTokenType = null;
            this._expansionCaseStack = [];
            this._inInterpolation = false;
            this.tokens = [];
            this.errors = [];
            this._tokenizeIcu = options.tokenizeExpansionForms || false;
            this._interpolationConfig = options.interpolationConfig || interpolation_config_1.DEFAULT_INTERPOLATION_CONFIG;
            this._leadingTriviaCodePoints =
                options.leadingTriviaChars && options.leadingTriviaChars.map(function (c) { return c.codePointAt(0) || 0; });
            var range = options.range || { endPos: _file.content.length, startPos: 0, startLine: 0, startCol: 0 };
            this._cursor = options.escapedString ? new EscapedCharacterCursor(_file, range) :
                new PlainCharacterCursor(_file, range);
            this._preserveLineEndings = options.preserveLineEndings || false;
            try {
                this._cursor.init();
            }
            catch (e) {
                this.handleError(e);
            }
        }
        _Tokenizer.prototype._processCarriageReturns = function (content) {
            if (this._preserveLineEndings) {
                return content;
            }
            // http://www.w3.org/TR/html5/syntax.html#preprocessing-the-input-stream
            // In order to keep the original position in the source, we can not
            // pre-process it.
            // Instead CRs are processed right before instantiating the tokens.
            return content.replace(_CR_OR_CRLF_REGEXP, '\n');
        };
        _Tokenizer.prototype.tokenize = function () {
            while (this._cursor.peek() !== chars.$EOF) {
                var start = this._cursor.clone();
                try {
                    if (this._attemptCharCode(chars.$LT)) {
                        if (this._attemptCharCode(chars.$BANG)) {
                            if (this._attemptCharCode(chars.$LBRACKET)) {
                                this._consumeCdata(start);
                            }
                            else if (this._attemptCharCode(chars.$MINUS)) {
                                this._consumeComment(start);
                            }
                            else {
                                this._consumeDocType(start);
                            }
                        }
                        else if (this._attemptCharCode(chars.$SLASH)) {
                            this._consumeTagClose(start);
                        }
                        else {
                            this._consumeTagOpen(start);
                        }
                    }
                    else if (!(this._tokenizeIcu && this._tokenizeExpansionForm())) {
                        this._consumeText();
                    }
                }
                catch (e) {
                    this.handleError(e);
                }
            }
            this._beginToken(TokenType.EOF);
            this._endToken([]);
            return new TokenizeResult(mergeTextTokens(this.tokens), this.errors);
        };
        /**
         * @returns whether an ICU token has been created
         * @internal
         */
        _Tokenizer.prototype._tokenizeExpansionForm = function () {
            if (this.isExpansionFormStart()) {
                this._consumeExpansionFormStart();
                return true;
            }
            if (isExpansionCaseStart(this._cursor.peek()) && this._isInExpansionForm()) {
                this._consumeExpansionCaseStart();
                return true;
            }
            if (this._cursor.peek() === chars.$RBRACE) {
                if (this._isInExpansionCase()) {
                    this._consumeExpansionCaseEnd();
                    return true;
                }
                if (this._isInExpansionForm()) {
                    this._consumeExpansionFormEnd();
                    return true;
                }
            }
            return false;
        };
        _Tokenizer.prototype._beginToken = function (type, start) {
            if (start === void 0) { start = this._cursor.clone(); }
            this._currentTokenStart = start;
            this._currentTokenType = type;
        };
        _Tokenizer.prototype._endToken = function (parts, end) {
            if (this._currentTokenStart === null) {
                throw new TokenError('Programming error - attempted to end a token when there was no start to the token', this._currentTokenType, this._cursor.getSpan(end));
            }
            if (this._currentTokenType === null) {
                throw new TokenError('Programming error - attempted to end a token which has no token type', null, this._cursor.getSpan(this._currentTokenStart));
            }
            var token = new Token(this._currentTokenType, parts, this._cursor.getSpan(this._currentTokenStart, this._leadingTriviaCodePoints));
            this.tokens.push(token);
            this._currentTokenStart = null;
            this._currentTokenType = null;
            return token;
        };
        _Tokenizer.prototype._createError = function (msg, span) {
            if (this._isInExpansionForm()) {
                msg += " (Do you have an unescaped \"{\" in your template? Use \"{{ '{' }}\") to escape it.)";
            }
            var error = new TokenError(msg, this._currentTokenType, span);
            this._currentTokenStart = null;
            this._currentTokenType = null;
            return new _ControlFlowError(error);
        };
        _Tokenizer.prototype.handleError = function (e) {
            if (e instanceof CursorError) {
                e = this._createError(e.msg, this._cursor.getSpan(e.cursor));
            }
            if (e instanceof _ControlFlowError) {
                this.errors.push(e.error);
            }
            else {
                throw e;
            }
        };
        _Tokenizer.prototype._attemptCharCode = function (charCode) {
            if (this._cursor.peek() === charCode) {
                this._cursor.advance();
                return true;
            }
            return false;
        };
        _Tokenizer.prototype._attemptCharCodeCaseInsensitive = function (charCode) {
            if (compareCharCodeCaseInsensitive(this._cursor.peek(), charCode)) {
                this._cursor.advance();
                return true;
            }
            return false;
        };
        _Tokenizer.prototype._requireCharCode = function (charCode) {
            var location = this._cursor.clone();
            if (!this._attemptCharCode(charCode)) {
                throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(location));
            }
        };
        _Tokenizer.prototype._attemptStr = function (chars) {
            var len = chars.length;
            if (this._cursor.charsLeft() < len) {
                return false;
            }
            var initialPosition = this._cursor.clone();
            for (var i = 0; i < len; i++) {
                if (!this._attemptCharCode(chars.charCodeAt(i))) {
                    // If attempting to parse the string fails, we want to reset the parser
                    // to where it was before the attempt
                    this._cursor = initialPosition;
                    return false;
                }
            }
            return true;
        };
        _Tokenizer.prototype._attemptStrCaseInsensitive = function (chars) {
            for (var i = 0; i < chars.length; i++) {
                if (!this._attemptCharCodeCaseInsensitive(chars.charCodeAt(i))) {
                    return false;
                }
            }
            return true;
        };
        _Tokenizer.prototype._requireStr = function (chars) {
            var location = this._cursor.clone();
            if (!this._attemptStr(chars)) {
                throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(location));
            }
        };
        _Tokenizer.prototype._attemptCharCodeUntilFn = function (predicate) {
            while (!predicate(this._cursor.peek())) {
                this._cursor.advance();
            }
        };
        _Tokenizer.prototype._requireCharCodeUntilFn = function (predicate, len) {
            var start = this._cursor.clone();
            this._attemptCharCodeUntilFn(predicate);
            if (this._cursor.diff(start) < len) {
                throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(start));
            }
        };
        _Tokenizer.prototype._attemptUntilChar = function (char) {
            while (this._cursor.peek() !== char) {
                this._cursor.advance();
            }
        };
        _Tokenizer.prototype._readChar = function (decodeEntities) {
            if (decodeEntities && this._cursor.peek() === chars.$AMPERSAND) {
                return this._decodeEntity();
            }
            else {
                // Don't rely upon reading directly from `_input` as the actual char value
                // may have been generated from an escape sequence.
                var char = String.fromCodePoint(this._cursor.peek());
                this._cursor.advance();
                return char;
            }
        };
        _Tokenizer.prototype._decodeEntity = function () {
            var start = this._cursor.clone();
            this._cursor.advance();
            if (this._attemptCharCode(chars.$HASH)) {
                var isHex = this._attemptCharCode(chars.$x) || this._attemptCharCode(chars.$X);
                var codeStart = this._cursor.clone();
                this._attemptCharCodeUntilFn(isDigitEntityEnd);
                if (this._cursor.peek() != chars.$SEMICOLON) {
                    throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan());
                }
                var strNum = this._cursor.getChars(codeStart);
                this._cursor.advance();
                try {
                    var charCode = parseInt(strNum, isHex ? 16 : 10);
                    return String.fromCharCode(charCode);
                }
                catch (_a) {
                    throw this._createError(_unknownEntityErrorMsg(this._cursor.getChars(start)), this._cursor.getSpan());
                }
            }
            else {
                var nameStart = this._cursor.clone();
                this._attemptCharCodeUntilFn(isNamedEntityEnd);
                if (this._cursor.peek() != chars.$SEMICOLON) {
                    this._cursor = nameStart;
                    return '&';
                }
                var name_1 = this._cursor.getChars(nameStart);
                this._cursor.advance();
                var char = tags_1.NAMED_ENTITIES[name_1];
                if (!char) {
                    throw this._createError(_unknownEntityErrorMsg(name_1), this._cursor.getSpan(start));
                }
                return char;
            }
        };
        _Tokenizer.prototype._consumeRawText = function (decodeEntities, endMarkerPredicate) {
            this._beginToken(decodeEntities ? TokenType.ESCAPABLE_RAW_TEXT : TokenType.RAW_TEXT);
            var parts = [];
            while (true) {
                var tagCloseStart = this._cursor.clone();
                var foundEndMarker = endMarkerPredicate();
                this._cursor = tagCloseStart;
                if (foundEndMarker) {
                    break;
                }
                parts.push(this._readChar(decodeEntities));
            }
            return this._endToken([this._processCarriageReturns(parts.join(''))]);
        };
        _Tokenizer.prototype._consumeComment = function (start) {
            var _this = this;
            this._beginToken(TokenType.COMMENT_START, start);
            this._requireCharCode(chars.$MINUS);
            this._endToken([]);
            this._consumeRawText(false, function () { return _this._attemptStr('-->'); });
            this._beginToken(TokenType.COMMENT_END);
            this._requireStr('-->');
            this._endToken([]);
        };
        _Tokenizer.prototype._consumeCdata = function (start) {
            var _this = this;
            this._beginToken(TokenType.CDATA_START, start);
            this._requireStr('CDATA[');
            this._endToken([]);
            this._consumeRawText(false, function () { return _this._attemptStr(']]>'); });
            this._beginToken(TokenType.CDATA_END);
            this._requireStr(']]>');
            this._endToken([]);
        };
        _Tokenizer.prototype._consumeDocType = function (start) {
            this._beginToken(TokenType.DOC_TYPE, start);
            var contentStart = this._cursor.clone();
            this._attemptUntilChar(chars.$GT);
            var content = this._cursor.getChars(contentStart);
            this._cursor.advance();
            this._endToken([content]);
        };
        _Tokenizer.prototype._consumePrefixAndName = function () {
            var nameOrPrefixStart = this._cursor.clone();
            var prefix = '';
            while (this._cursor.peek() !== chars.$COLON && !isPrefixEnd(this._cursor.peek())) {
                this._cursor.advance();
            }
            var nameStart;
            if (this._cursor.peek() === chars.$COLON) {
                prefix = this._cursor.getChars(nameOrPrefixStart);
                this._cursor.advance();
                nameStart = this._cursor.clone();
            }
            else {
                nameStart = nameOrPrefixStart;
            }
            this._requireCharCodeUntilFn(isNameEnd, prefix === '' ? 0 : 1);
            var name = this._cursor.getChars(nameStart);
            return [prefix, name];
        };
        _Tokenizer.prototype._consumeTagOpen = function (start) {
            var tagName;
            var prefix;
            var openTagToken;
            var tokensBeforeTagOpen = this.tokens.length;
            var innerStart = this._cursor.clone();
            try {
                if (!chars.isAsciiLetter(this._cursor.peek())) {
                    throw this._createError(_unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(start));
                }
                openTagToken = this._consumeTagOpenStart(start);
                prefix = openTagToken.parts[0];
                tagName = openTagToken.parts[1];
                this._attemptCharCodeUntilFn(isNotWhitespace);
                while (this._cursor.peek() !== chars.$SLASH && this._cursor.peek() !== chars.$GT) {
                    this._consumeAttributeName();
                    this._attemptCharCodeUntilFn(isNotWhitespace);
                    if (this._attemptCharCode(chars.$EQ)) {
                        this._attemptCharCodeUntilFn(isNotWhitespace);
                        this._consumeAttributeValue();
                    }
                    this._attemptCharCodeUntilFn(isNotWhitespace);
                }
                this._consumeTagOpenEnd();
            }
            catch (e) {
                if (e instanceof _ControlFlowError) {
                    // When the start tag is invalid (including invalid "attributes"), assume we want a "<"
                    this._cursor = innerStart;
                    if (openTagToken) {
                        this.tokens.length = tokensBeforeTagOpen;
                    }
                    // Back to back text tokens are merged at the end
                    this._beginToken(TokenType.TEXT, start);
                    this._endToken(['<']);
                    return;
                }
                throw e;
            }
            var contentTokenType = this._getTagDefinition(tagName).contentType;
            if (contentTokenType === tags_1.TagContentType.RAW_TEXT) {
                this._consumeRawTextWithTagClose(prefix, tagName, false);
            }
            else if (contentTokenType === tags_1.TagContentType.ESCAPABLE_RAW_TEXT) {
                this._consumeRawTextWithTagClose(prefix, tagName, true);
            }
        };
        _Tokenizer.prototype._consumeRawTextWithTagClose = function (prefix, tagName, decodeEntities) {
            var _this = this;
            var textToken = this._consumeRawText(decodeEntities, function () {
                if (!_this._attemptCharCode(chars.$LT))
                    return false;
                if (!_this._attemptCharCode(chars.$SLASH))
                    return false;
                _this._attemptCharCodeUntilFn(isNotWhitespace);
                if (!_this._attemptStrCaseInsensitive(tagName))
                    return false;
                _this._attemptCharCodeUntilFn(isNotWhitespace);
                return _this._attemptCharCode(chars.$GT);
            });
            this._beginToken(TokenType.TAG_CLOSE);
            this._requireCharCodeUntilFn(function (code) { return code === chars.$GT; }, 3);
            this._cursor.advance(); // Consume the `>`
            this._endToken([prefix, tagName]);
        };
        _Tokenizer.prototype._consumeTagOpenStart = function (start) {
            this._beginToken(TokenType.TAG_OPEN_START, start);
            var parts = this._consumePrefixAndName();
            return this._endToken(parts);
        };
        _Tokenizer.prototype._consumeAttributeName = function () {
            var attrNameStart = this._cursor.peek();
            if (attrNameStart === chars.$SQ || attrNameStart === chars.$DQ) {
                throw this._createError(_unexpectedCharacterErrorMsg(attrNameStart), this._cursor.getSpan());
            }
            this._beginToken(TokenType.ATTR_NAME);
            var prefixAndName = this._consumePrefixAndName();
            this._endToken(prefixAndName);
        };
        _Tokenizer.prototype._consumeAttributeValue = function () {
            var value;
            if (this._cursor.peek() === chars.$SQ || this._cursor.peek() === chars.$DQ) {
                this._beginToken(TokenType.ATTR_QUOTE);
                var quoteChar = this._cursor.peek();
                this._cursor.advance();
                this._endToken([String.fromCodePoint(quoteChar)]);
                this._beginToken(TokenType.ATTR_VALUE);
                var parts = [];
                while (this._cursor.peek() !== quoteChar) {
                    parts.push(this._readChar(true));
                }
                value = parts.join('');
                this._endToken([this._processCarriageReturns(value)]);
                this._beginToken(TokenType.ATTR_QUOTE);
                this._cursor.advance();
                this._endToken([String.fromCodePoint(quoteChar)]);
            }
            else {
                this._beginToken(TokenType.ATTR_VALUE);
                var valueStart = this._cursor.clone();
                this._requireCharCodeUntilFn(isNameEnd, 1);
                value = this._cursor.getChars(valueStart);
                this._endToken([this._processCarriageReturns(value)]);
            }
        };
        _Tokenizer.prototype._consumeTagOpenEnd = function () {
            var tokenType = this._attemptCharCode(chars.$SLASH) ? TokenType.TAG_OPEN_END_VOID : TokenType.TAG_OPEN_END;
            this._beginToken(tokenType);
            this._requireCharCode(chars.$GT);
            this._endToken([]);
        };
        _Tokenizer.prototype._consumeTagClose = function (start) {
            this._beginToken(TokenType.TAG_CLOSE, start);
            this._attemptCharCodeUntilFn(isNotWhitespace);
            var prefixAndName = this._consumePrefixAndName();
            this._attemptCharCodeUntilFn(isNotWhitespace);
            this._requireCharCode(chars.$GT);
            this._endToken(prefixAndName);
        };
        _Tokenizer.prototype._consumeExpansionFormStart = function () {
            this._beginToken(TokenType.EXPANSION_FORM_START);
            this._requireCharCode(chars.$LBRACE);
            this._endToken([]);
            this._expansionCaseStack.push(TokenType.EXPANSION_FORM_START);
            this._beginToken(TokenType.RAW_TEXT);
            var condition = this._readUntil(chars.$COMMA);
            this._endToken([condition]);
            this._requireCharCode(chars.$COMMA);
            this._attemptCharCodeUntilFn(isNotWhitespace);
            this._beginToken(TokenType.RAW_TEXT);
            var type = this._readUntil(chars.$COMMA);
            this._endToken([type]);
            this._requireCharCode(chars.$COMMA);
            this._attemptCharCodeUntilFn(isNotWhitespace);
        };
        _Tokenizer.prototype._consumeExpansionCaseStart = function () {
            this._beginToken(TokenType.EXPANSION_CASE_VALUE);
            var value = this._readUntil(chars.$LBRACE).trim();
            this._endToken([value]);
            this._attemptCharCodeUntilFn(isNotWhitespace);
            this._beginToken(TokenType.EXPANSION_CASE_EXP_START);
            this._requireCharCode(chars.$LBRACE);
            this._endToken([]);
            this._attemptCharCodeUntilFn(isNotWhitespace);
            this._expansionCaseStack.push(TokenType.EXPANSION_CASE_EXP_START);
        };
        _Tokenizer.prototype._consumeExpansionCaseEnd = function () {
            this._beginToken(TokenType.EXPANSION_CASE_EXP_END);
            this._requireCharCode(chars.$RBRACE);
            this._endToken([]);
            this._attemptCharCodeUntilFn(isNotWhitespace);
            this._expansionCaseStack.pop();
        };
        _Tokenizer.prototype._consumeExpansionFormEnd = function () {
            this._beginToken(TokenType.EXPANSION_FORM_END);
            this._requireCharCode(chars.$RBRACE);
            this._endToken([]);
            this._expansionCaseStack.pop();
        };
        _Tokenizer.prototype._consumeText = function () {
            var start = this._cursor.clone();
            this._beginToken(TokenType.TEXT, start);
            var parts = [];
            do {
                if (this._interpolationConfig && this._attemptStr(this._interpolationConfig.start)) {
                    parts.push(this._interpolationConfig.start);
                    this._inInterpolation = true;
                }
                else if (this._interpolationConfig && this._inInterpolation &&
                    this._attemptStr(this._interpolationConfig.end)) {
                    parts.push(this._interpolationConfig.end);
                    this._inInterpolation = false;
                }
                else {
                    parts.push(this._readChar(true));
                }
            } while (!this._isTextEnd());
            this._endToken([this._processCarriageReturns(parts.join(''))]);
        };
        _Tokenizer.prototype._isTextEnd = function () {
            if (this._cursor.peek() === chars.$LT || this._cursor.peek() === chars.$EOF) {
                return true;
            }
            if (this._tokenizeIcu && !this._inInterpolation) {
                if (this.isExpansionFormStart()) {
                    // start of an expansion form
                    return true;
                }
                if (this._cursor.peek() === chars.$RBRACE && this._isInExpansionCase()) {
                    // end of and expansion case
                    return true;
                }
            }
            return false;
        };
        _Tokenizer.prototype._readUntil = function (char) {
            var start = this._cursor.clone();
            this._attemptUntilChar(char);
            return this._cursor.getChars(start);
        };
        _Tokenizer.prototype._isInExpansionCase = function () {
            return this._expansionCaseStack.length > 0 &&
                this._expansionCaseStack[this._expansionCaseStack.length - 1] ===
                    TokenType.EXPANSION_CASE_EXP_START;
        };
        _Tokenizer.prototype._isInExpansionForm = function () {
            return this._expansionCaseStack.length > 0 &&
                this._expansionCaseStack[this._expansionCaseStack.length - 1] ===
                    TokenType.EXPANSION_FORM_START;
        };
        _Tokenizer.prototype.isExpansionFormStart = function () {
            if (this._cursor.peek() !== chars.$LBRACE) {
                return false;
            }
            if (this._interpolationConfig) {
                var start = this._cursor.clone();
                var isInterpolation = this._attemptStr(this._interpolationConfig.start);
                this._cursor = start;
                return !isInterpolation;
            }
            return true;
        };
        return _Tokenizer;
    }());
    function isNotWhitespace(code) {
        return !chars.isWhitespace(code) || code === chars.$EOF;
    }
    function isNameEnd(code) {
        return chars.isWhitespace(code) || code === chars.$GT || code === chars.$SLASH ||
            code === chars.$SQ || code === chars.$DQ || code === chars.$EQ;
    }
    function isPrefixEnd(code) {
        return (code < chars.$a || chars.$z < code) && (code < chars.$A || chars.$Z < code) &&
            (code < chars.$0 || code > chars.$9);
    }
    function isDigitEntityEnd(code) {
        return code == chars.$SEMICOLON || code == chars.$EOF || !chars.isAsciiHexDigit(code);
    }
    function isNamedEntityEnd(code) {
        return code == chars.$SEMICOLON || code == chars.$EOF || !chars.isAsciiLetter(code);
    }
    function isExpansionCaseStart(peek) {
        return peek !== chars.$RBRACE;
    }
    function compareCharCodeCaseInsensitive(code1, code2) {
        return toUpperCaseCharCode(code1) == toUpperCaseCharCode(code2);
    }
    function toUpperCaseCharCode(code) {
        return code >= chars.$a && code <= chars.$z ? code - chars.$a + chars.$A : code;
    }
    function mergeTextTokens(srcTokens) {
        var dstTokens = [];
        var lastDstToken = undefined;
        for (var i = 0; i < srcTokens.length; i++) {
            var token = srcTokens[i];
            if (lastDstToken && lastDstToken.type == TokenType.TEXT && token.type == TokenType.TEXT) {
                lastDstToken.parts[0] += token.parts[0];
                lastDstToken.sourceSpan.end = token.sourceSpan.end;
            }
            else {
                lastDstToken = token;
                dstTokens.push(lastDstToken);
            }
        }
        return dstTokens;
    }
    var PlainCharacterCursor = /** @class */ (function () {
        function PlainCharacterCursor(fileOrCursor, range) {
            if (fileOrCursor instanceof PlainCharacterCursor) {
                this.file = fileOrCursor.file;
                this.input = fileOrCursor.input;
                this.end = fileOrCursor.end;
                var state = fileOrCursor.state;
                // Note: avoid using `{...fileOrCursor.state}` here as that has a severe performance penalty.
                // In ES5 bundles the object spread operator is translated into the `__assign` helper, which
                // is not optimized by VMs as efficiently as a raw object literal. Since this constructor is
                // called in tight loops, this difference matters.
                this.state = {
                    peek: state.peek,
                    offset: state.offset,
                    line: state.line,
                    column: state.column,
                };
            }
            else {
                if (!range) {
                    throw new Error('Programming error: the range argument must be provided with a file argument.');
                }
                this.file = fileOrCursor;
                this.input = fileOrCursor.content;
                this.end = range.endPos;
                this.state = {
                    peek: -1,
                    offset: range.startPos,
                    line: range.startLine,
                    column: range.startCol,
                };
            }
        }
        PlainCharacterCursor.prototype.clone = function () {
            return new PlainCharacterCursor(this);
        };
        PlainCharacterCursor.prototype.peek = function () {
            return this.state.peek;
        };
        PlainCharacterCursor.prototype.charsLeft = function () {
            return this.end - this.state.offset;
        };
        PlainCharacterCursor.prototype.diff = function (other) {
            return this.state.offset - other.state.offset;
        };
        PlainCharacterCursor.prototype.advance = function () {
            this.advanceState(this.state);
        };
        PlainCharacterCursor.prototype.init = function () {
            this.updatePeek(this.state);
        };
        PlainCharacterCursor.prototype.getSpan = function (start, leadingTriviaCodePoints) {
            start = start || this;
            var cloned = false;
            if (leadingTriviaCodePoints) {
                while (this.diff(start) > 0 && leadingTriviaCodePoints.indexOf(start.peek()) !== -1) {
                    if (!cloned) {
                        start = start.clone();
                        cloned = true;
                    }
                    start.advance();
                }
            }
            return new parse_util_1.ParseSourceSpan(new parse_util_1.ParseLocation(start.file, start.state.offset, start.state.line, start.state.column), new parse_util_1.ParseLocation(this.file, this.state.offset, this.state.line, this.state.column));
        };
        PlainCharacterCursor.prototype.getChars = function (start) {
            return this.input.substring(start.state.offset, this.state.offset);
        };
        PlainCharacterCursor.prototype.charAt = function (pos) {
            return this.input.charCodeAt(pos);
        };
        PlainCharacterCursor.prototype.advanceState = function (state) {
            if (state.offset >= this.end) {
                this.state = state;
                throw new CursorError('Unexpected character "EOF"', this);
            }
            var currentChar = this.charAt(state.offset);
            if (currentChar === chars.$LF) {
                state.line++;
                state.column = 0;
            }
            else if (!chars.isNewLine(currentChar)) {
                state.column++;
            }
            state.offset++;
            this.updatePeek(state);
        };
        PlainCharacterCursor.prototype.updatePeek = function (state) {
            state.peek = state.offset >= this.end ? chars.$EOF : this.charAt(state.offset);
        };
        return PlainCharacterCursor;
    }());
    var EscapedCharacterCursor = /** @class */ (function (_super) {
        tslib_1.__extends(EscapedCharacterCursor, _super);
        function EscapedCharacterCursor(fileOrCursor, range) {
            var _this = this;
            if (fileOrCursor instanceof EscapedCharacterCursor) {
                _this = _super.call(this, fileOrCursor) || this;
                _this.internalState = tslib_1.__assign({}, fileOrCursor.internalState);
            }
            else {
                _this = _super.call(this, fileOrCursor, range) || this;
                _this.internalState = _this.state;
            }
            return _this;
        }
        EscapedCharacterCursor.prototype.advance = function () {
            this.state = this.internalState;
            _super.prototype.advance.call(this);
            this.processEscapeSequence();
        };
        EscapedCharacterCursor.prototype.init = function () {
            _super.prototype.init.call(this);
            this.processEscapeSequence();
        };
        EscapedCharacterCursor.prototype.clone = function () {
            return new EscapedCharacterCursor(this);
        };
        EscapedCharacterCursor.prototype.getChars = function (start) {
            var cursor = start.clone();
            var chars = '';
            while (cursor.internalState.offset < this.internalState.offset) {
                chars += String.fromCodePoint(cursor.peek());
                cursor.advance();
            }
            return chars;
        };
        /**
         * Process the escape sequence that starts at the current position in the text.
         *
         * This method is called to ensure that `peek` has the unescaped value of escape sequences.
         */
        EscapedCharacterCursor.prototype.processEscapeSequence = function () {
            var _this = this;
            var peek = function () { return _this.internalState.peek; };
            if (peek() === chars.$BACKSLASH) {
                // We have hit an escape sequence so we need the internal state to become independent
                // of the external state.
                this.internalState = tslib_1.__assign({}, this.state);
                // Move past the backslash
                this.advanceState(this.internalState);
                // First check for standard control char sequences
                if (peek() === chars.$n) {
                    this.state.peek = chars.$LF;
                }
                else if (peek() === chars.$r) {
                    this.state.peek = chars.$CR;
                }
                else if (peek() === chars.$v) {
                    this.state.peek = chars.$VTAB;
                }
                else if (peek() === chars.$t) {
                    this.state.peek = chars.$TAB;
                }
                else if (peek() === chars.$b) {
                    this.state.peek = chars.$BSPACE;
                }
                else if (peek() === chars.$f) {
                    this.state.peek = chars.$FF;
                }
                // Now consider more complex sequences
                else if (peek() === chars.$u) {
                    // Unicode code-point sequence
                    this.advanceState(this.internalState); // advance past the `u` char
                    if (peek() === chars.$LBRACE) {
                        // Variable length Unicode, e.g. `\x{123}`
                        this.advanceState(this.internalState); // advance past the `{` char
                        // Advance past the variable number of hex digits until we hit a `}` char
                        var digitStart = this.clone();
                        var length_1 = 0;
                        while (peek() !== chars.$RBRACE) {
                            this.advanceState(this.internalState);
                            length_1++;
                        }
                        this.state.peek = this.decodeHexDigits(digitStart, length_1);
                    }
                    else {
                        // Fixed length Unicode, e.g. `\u1234`
                        var digitStart = this.clone();
                        this.advanceState(this.internalState);
                        this.advanceState(this.internalState);
                        this.advanceState(this.internalState);
                        this.state.peek = this.decodeHexDigits(digitStart, 4);
                    }
                }
                else if (peek() === chars.$x) {
                    // Hex char code, e.g. `\x2F`
                    this.advanceState(this.internalState); // advance past the `x` char
                    var digitStart = this.clone();
                    this.advanceState(this.internalState);
                    this.state.peek = this.decodeHexDigits(digitStart, 2);
                }
                else if (chars.isOctalDigit(peek())) {
                    // Octal char code, e.g. `\012`,
                    var octal = '';
                    var length_2 = 0;
                    var previous = this.clone();
                    while (chars.isOctalDigit(peek()) && length_2 < 3) {
                        previous = this.clone();
                        octal += String.fromCodePoint(peek());
                        this.advanceState(this.internalState);
                        length_2++;
                    }
                    this.state.peek = parseInt(octal, 8);
                    // Backup one char
                    this.internalState = previous.internalState;
                }
                else if (chars.isNewLine(this.internalState.peek)) {
                    // Line continuation `\` followed by a new line
                    this.advanceState(this.internalState); // advance over the newline
                    this.state = this.internalState;
                }
                else {
                    // If none of the `if` blocks were executed then we just have an escaped normal character.
                    // In that case we just, effectively, skip the backslash from the character.
                    this.state.peek = this.internalState.peek;
                }
            }
        };
        EscapedCharacterCursor.prototype.decodeHexDigits = function (start, length) {
            var hex = this.input.substr(start.internalState.offset, length);
            var charCode = parseInt(hex, 16);
            if (!isNaN(charCode)) {
                return charCode;
            }
            else {
                start.state = start.internalState;
                throw new CursorError('Invalid hexadecimal escape sequence', start);
            }
        };
        return EscapedCharacterCursor;
    }(PlainCharacterCursor));
    var CursorError = /** @class */ (function () {
        function CursorError(msg, cursor) {
            this.msg = msg;
            this.cursor = cursor;
        }
        return CursorError;
    }());
    exports.CursorError = CursorError;
});
//# 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* @license\n * Copyright Google Inc. All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport * as chars from '../chars';\nimport {ParseError, ParseLocation, ParseSourceFile, ParseSourceSpan} from '../parse_util';\n\nimport {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from './interpolation_config';\nimport {NAMED_ENTITIES, TagContentType, TagDefinition} from './tags';\n\nexport enum TokenType {\n  TAG_OPEN_START,\n  TAG_OPEN_END,\n  TAG_OPEN_END_VOID,\n  TAG_CLOSE,\n  TEXT,\n  ESCAPABLE_RAW_TEXT,\n  RAW_TEXT,\n  COMMENT_START,\n  COMMENT_END,\n  CDATA_START,\n  CDATA_END,\n  ATTR_NAME,\n  ATTR_QUOTE,\n  ATTR_VALUE,\n  DOC_TYPE,\n  EXPANSION_FORM_START,\n  EXPANSION_CASE_VALUE,\n  EXPANSION_CASE_EXP_START,\n  EXPANSION_CASE_EXP_END,\n  EXPANSION_FORM_END,\n  EOF\n}\n\nexport class Token {\n  constructor(\n      public type: TokenType|null, public parts: string[], public sourceSpan: ParseSourceSpan) {}\n}\n\nexport class TokenError extends ParseError {\n  constructor(errorMsg: string, public tokenType: TokenType|null, span: ParseSourceSpan) {\n    super(span, errorMsg);\n  }\n}\n\nexport class TokenizeResult {\n  constructor(public tokens: Token[], public errors: TokenError[]) {}\n}\n\nexport interface LexerRange {\n  startPos: number;\n  startLine: number;\n  startCol: number;\n  endPos: number;\n}\n\n/**\n * Options that modify how the text is tokenized.\n */\nexport interface TokenizeOptions {\n  /** Whether to tokenize ICU messages (considered as text nodes when false). */\n  tokenizeExpansionForms?: boolean;\n  /** How to tokenize interpolation markers. */\n  interpolationConfig?: InterpolationConfig;\n  /**\n   * The start and end point of the text to parse within the `source` string.\n   * The entire `source` string is parsed if this is not provided.\n   * */\n  range?: LexerRange;\n  /**\n   * If this text is stored in a JavaScript string, then we have to deal with escape sequences.\n   *\n   * **Example 1:**\n   *\n   * ```\n   * \"abc\\\"def\\nghi\"\n   * ```\n   *\n   * - The `\\\"` must be converted to `\"`.\n   * - The `\\n` must be converted to a new line character in a token,\n   *   but it should not increment the current line for source mapping.\n   *\n   * **Example 2:**\n   *\n   * ```\n   * \"abc\\\n   *  def\"\n   * ```\n   *\n   * The line continuation (`\\` followed by a newline) should be removed from a token\n   * but the new line should increment the current line for source mapping.\n   */\n  escapedString?: boolean;\n  /**\n   * An array of characters that should be considered as leading trivia.\n   * Leading trivia are characters that are not important to the developer, and so should not be\n   * included in source-map segments.  A common example is whitespace.\n   */\n  leadingTriviaChars?: string[];\n  /**\n   * If true, do not convert CRLF to LF.\n   */\n  preserveLineEndings?: boolean;\n}\n\nexport function tokenize(\n    source: string, url: string, getTagDefinition: (tagName: string) => TagDefinition,\n    options: TokenizeOptions = {}): TokenizeResult {\n  return new _Tokenizer(new ParseSourceFile(source, url), getTagDefinition, options).tokenize();\n}\n\nconst _CR_OR_CRLF_REGEXP = /\\r\\n?/g;\n\nfunction _unexpectedCharacterErrorMsg(charCode: number): string {\n  const char = charCode === chars.$EOF ? 'EOF' : String.fromCharCode(charCode);\n  return `Unexpected character \"${char}\"`;\n}\n\nfunction _unknownEntityErrorMsg(entitySrc: string): string {\n  return `Unknown entity \"${entitySrc}\" - use the \"&#<decimal>;\" or  \"&#x<hex>;\" syntax`;\n}\n\nclass _ControlFlowError {\n  constructor(public error: TokenError) {}\n}\n\n// See http://www.w3.org/TR/html51/syntax.html#writing\nclass _Tokenizer {\n  private _cursor: CharacterCursor;\n  private _tokenizeIcu: boolean;\n  private _interpolationConfig: InterpolationConfig;\n  private _leadingTriviaCodePoints: number[]|undefined;\n  private _currentTokenStart: CharacterCursor|null = null;\n  private _currentTokenType: TokenType|null = null;\n  private _expansionCaseStack: TokenType[] = [];\n  private _inInterpolation: boolean = false;\n  private readonly _preserveLineEndings: boolean;\n  tokens: Token[] = [];\n  errors: TokenError[] = [];\n\n  /**\n   * @param _file The html source file being tokenized.\n   * @param _getTagDefinition A function that will retrieve a tag definition for a given tag name.\n   * @param options Configuration of the tokenization.\n   */\n  constructor(\n      _file: ParseSourceFile, private _getTagDefinition: (tagName: string) => TagDefinition,\n      options: TokenizeOptions) {\n    this._tokenizeIcu = options.tokenizeExpansionForms || false;\n    this._interpolationConfig = options.interpolationConfig || DEFAULT_INTERPOLATION_CONFIG;\n    this._leadingTriviaCodePoints =\n        options.leadingTriviaChars && options.leadingTriviaChars.map(c => c.codePointAt(0) || 0);\n    const range =\n        options.range || {endPos: _file.content.length, startPos: 0, startLine: 0, startCol: 0};\n    this._cursor = options.escapedString ? new EscapedCharacterCursor(_file, range) :\n                                           new PlainCharacterCursor(_file, range);\n    this._preserveLineEndings = options.preserveLineEndings || false;\n    try {\n      this._cursor.init();\n    } catch (e) {\n      this.handleError(e);\n    }\n  }\n\n  private _processCarriageReturns(content: string): string {\n    if (this._preserveLineEndings) {\n      return content;\n    }\n    // http://www.w3.org/TR/html5/syntax.html#preprocessing-the-input-stream\n    // In order to keep the original position in the source, we can not\n    // pre-process it.\n    // Instead CRs are processed right before instantiating the tokens.\n    return content.replace(_CR_OR_CRLF_REGEXP, '\\n');\n  }\n\n  tokenize(): TokenizeResult {\n    while (this._cursor.peek() !== chars.$EOF) {\n      const start = this._cursor.clone();\n      try {\n        if (this._attemptCharCode(chars.$LT)) {\n          if (this._attemptCharCode(chars.$BANG)) {\n            if (this._attemptCharCode(chars.$LBRACKET)) {\n              this._consumeCdata(start);\n            } else if (this._attemptCharCode(chars.$MINUS)) {\n              this._consumeComment(start);\n            } else {\n              this._consumeDocType(start);\n            }\n          } else if (this._attemptCharCode(chars.$SLASH)) {\n            this._consumeTagClose(start);\n          } else {\n            this._consumeTagOpen(start);\n          }\n        } else if (!(this._tokenizeIcu && this._tokenizeExpansionForm())) {\n          this._consumeText();\n        }\n      } catch (e) {\n        this.handleError(e);\n      }\n    }\n    this._beginToken(TokenType.EOF);\n    this._endToken([]);\n    return new TokenizeResult(mergeTextTokens(this.tokens), this.errors);\n  }\n\n  /**\n   * @returns whether an ICU token has been created\n   * @internal\n   */\n  private _tokenizeExpansionForm(): boolean {\n    if (this.isExpansionFormStart()) {\n      this._consumeExpansionFormStart();\n      return true;\n    }\n\n    if (isExpansionCaseStart(this._cursor.peek()) && this._isInExpansionForm()) {\n      this._consumeExpansionCaseStart();\n      return true;\n    }\n\n    if (this._cursor.peek() === chars.$RBRACE) {\n      if (this._isInExpansionCase()) {\n        this._consumeExpansionCaseEnd();\n        return true;\n      }\n\n      if (this._isInExpansionForm()) {\n        this._consumeExpansionFormEnd();\n        return true;\n      }\n    }\n\n    return false;\n  }\n\n  private _beginToken(type: TokenType, start = this._cursor.clone()) {\n    this._currentTokenStart = start;\n    this._currentTokenType = type;\n  }\n\n  private _endToken(parts: string[], end?: CharacterCursor): Token {\n    if (this._currentTokenStart === null) {\n      throw new TokenError(\n          'Programming error - attempted to end a token when there was no start to the token',\n          this._currentTokenType, this._cursor.getSpan(end));\n    }\n    if (this._currentTokenType === null) {\n      throw new TokenError(\n          'Programming error - attempted to end a token which has no token type', null,\n          this._cursor.getSpan(this._currentTokenStart));\n    }\n    const token = new Token(\n        this._currentTokenType, parts,\n        this._cursor.getSpan(this._currentTokenStart, this._leadingTriviaCodePoints));\n    this.tokens.push(token);\n    this._currentTokenStart = null;\n    this._currentTokenType = null;\n    return token;\n  }\n\n  private _createError(msg: string, span: ParseSourceSpan): _ControlFlowError {\n    if (this._isInExpansionForm()) {\n      msg += ` (Do you have an unescaped \"{\" in your template? Use \"{{ '{' }}\") to escape it.)`;\n    }\n    const error = new TokenError(msg, this._currentTokenType, span);\n    this._currentTokenStart = null;\n    this._currentTokenType = null;\n    return new _ControlFlowError(error);\n  }\n\n  private handleError(e: any) {\n    if (e instanceof CursorError) {\n      e = this._createError(e.msg, this._cursor.getSpan(e.cursor));\n    }\n    if (e instanceof _ControlFlowError) {\n      this.errors.push(e.error);\n    } else {\n      throw e;\n    }\n  }\n\n  private _attemptCharCode(charCode: number): boolean {\n    if (this._cursor.peek() === charCode) {\n      this._cursor.advance();\n      return true;\n    }\n    return false;\n  }\n\n  private _attemptCharCodeCaseInsensitive(charCode: number): boolean {\n    if (compareCharCodeCaseInsensitive(this._cursor.peek(), charCode)) {\n      this._cursor.advance();\n      return true;\n    }\n    return false;\n  }\n\n  private _requireCharCode(charCode: number) {\n    const location = this._cursor.clone();\n    if (!this._attemptCharCode(charCode)) {\n      throw this._createError(\n          _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(location));\n    }\n  }\n\n  private _attemptStr(chars: string): boolean {\n    const len = chars.length;\n    if (this._cursor.charsLeft() < len) {\n      return false;\n    }\n    const initialPosition = this._cursor.clone();\n    for (let i = 0; i < len; i++) {\n      if (!this._attemptCharCode(chars.charCodeAt(i))) {\n        // If attempting to parse the string fails, we want to reset the parser\n        // to where it was before the attempt\n        this._cursor = initialPosition;\n        return false;\n      }\n    }\n    return true;\n  }\n\n  private _attemptStrCaseInsensitive(chars: string): boolean {\n    for (let i = 0; i < chars.length; i++) {\n      if (!this._attemptCharCodeCaseInsensitive(chars.charCodeAt(i))) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  private _requireStr(chars: string) {\n    const location = this._cursor.clone();\n    if (!this._attemptStr(chars)) {\n      throw this._createError(\n          _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(location));\n    }\n  }\n\n  private _attemptCharCodeUntilFn(predicate: (code: number) => boolean) {\n    while (!predicate(this._cursor.peek())) {\n      this._cursor.advance();\n    }\n  }\n\n  private _requireCharCodeUntilFn(predicate: (code: number) => boolean, len: number) {\n    const start = this._cursor.clone();\n    this._attemptCharCodeUntilFn(predicate);\n    if (this._cursor.diff(start) < len) {\n      throw this._createError(\n          _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(start));\n    }\n  }\n\n  private _attemptUntilChar(char: number) {\n    while (this._cursor.peek() !== char) {\n      this._cursor.advance();\n    }\n  }\n\n  private _readChar(decodeEntities: boolean): string {\n    if (decodeEntities && this._cursor.peek() === chars.$AMPERSAND) {\n      return this._decodeEntity();\n    } else {\n      // Don't rely upon reading directly from `_input` as the actual char value\n      // may have been generated from an escape sequence.\n      const char = String.fromCodePoint(this._cursor.peek());\n      this._cursor.advance();\n      return char;\n    }\n  }\n\n  private _decodeEntity(): string {\n    const start = this._cursor.clone();\n    this._cursor.advance();\n    if (this._attemptCharCode(chars.$HASH)) {\n      const isHex = this._attemptCharCode(chars.$x) || this._attemptCharCode(chars.$X);\n      const codeStart = this._cursor.clone();\n      this._attemptCharCodeUntilFn(isDigitEntityEnd);\n      if (this._cursor.peek() != chars.$SEMICOLON) {\n        throw this._createError(\n            _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan());\n      }\n      const strNum = this._cursor.getChars(codeStart);\n      this._cursor.advance();\n      try {\n        const charCode = parseInt(strNum, isHex ? 16 : 10);\n        return String.fromCharCode(charCode);\n      } catch {\n        throw this._createError(\n            _unknownEntityErrorMsg(this._cursor.getChars(start)), this._cursor.getSpan());\n      }\n    } else {\n      const nameStart = this._cursor.clone();\n      this._attemptCharCodeUntilFn(isNamedEntityEnd);\n      if (this._cursor.peek() != chars.$SEMICOLON) {\n        this._cursor = nameStart;\n        return '&';\n      }\n      const name = this._cursor.getChars(nameStart);\n      this._cursor.advance();\n      const char = NAMED_ENTITIES[name];\n      if (!char) {\n        throw this._createError(_unknownEntityErrorMsg(name), this._cursor.getSpan(start));\n      }\n      return char;\n    }\n  }\n\n  private _consumeRawText(decodeEntities: boolean, endMarkerPredicate: () => boolean): Token {\n    this._beginToken(decodeEntities ? TokenType.ESCAPABLE_RAW_TEXT : TokenType.RAW_TEXT);\n    const parts: string[] = [];\n    while (true) {\n      const tagCloseStart = this._cursor.clone();\n      const foundEndMarker = endMarkerPredicate();\n      this._cursor = tagCloseStart;\n      if (foundEndMarker) {\n        break;\n      }\n      parts.push(this._readChar(decodeEntities));\n    }\n    return this._endToken([this._processCarriageReturns(parts.join(''))]);\n  }\n\n  private _consumeComment(start: CharacterCursor) {\n    this._beginToken(TokenType.COMMENT_START, start);\n    this._requireCharCode(chars.$MINUS);\n    this._endToken([]);\n    this._consumeRawText(false, () => this._attemptStr('-->'));\n    this._beginToken(TokenType.COMMENT_END);\n    this._requireStr('-->');\n    this._endToken([]);\n  }\n\n  private _consumeCdata(start: CharacterCursor) {\n    this._beginToken(TokenType.CDATA_START, start);\n    this._requireStr('CDATA[');\n    this._endToken([]);\n    this._consumeRawText(false, () => this._attemptStr(']]>'));\n    this._beginToken(TokenType.CDATA_END);\n    this._requireStr(']]>');\n    this._endToken([]);\n  }\n\n  private _consumeDocType(start: CharacterCursor) {\n    this._beginToken(TokenType.DOC_TYPE, start);\n    const contentStart = this._cursor.clone();\n    this._attemptUntilChar(chars.$GT);\n    const content = this._cursor.getChars(contentStart);\n    this._cursor.advance();\n    this._endToken([content]);\n  }\n\n  private _consumePrefixAndName(): string[] {\n    const nameOrPrefixStart = this._cursor.clone();\n    let prefix: string = '';\n    while (this._cursor.peek() !== chars.$COLON && !isPrefixEnd(this._cursor.peek())) {\n      this._cursor.advance();\n    }\n    let nameStart: CharacterCursor;\n    if (this._cursor.peek() === chars.$COLON) {\n      prefix = this._cursor.getChars(nameOrPrefixStart);\n      this._cursor.advance();\n      nameStart = this._cursor.clone();\n    } else {\n      nameStart = nameOrPrefixStart;\n    }\n    this._requireCharCodeUntilFn(isNameEnd, prefix === '' ? 0 : 1);\n    const name = this._cursor.getChars(nameStart);\n    return [prefix, name];\n  }\n\n  private _consumeTagOpen(start: CharacterCursor) {\n    let tagName: string;\n    let prefix: string;\n    let openTagToken: Token|undefined;\n    let tokensBeforeTagOpen = this.tokens.length;\n    const innerStart = this._cursor.clone();\n    try {\n      if (!chars.isAsciiLetter(this._cursor.peek())) {\n        throw this._createError(\n            _unexpectedCharacterErrorMsg(this._cursor.peek()), this._cursor.getSpan(start));\n      }\n\n      openTagToken = this._consumeTagOpenStart(start);\n      prefix = openTagToken.parts[0];\n      tagName = openTagToken.parts[1];\n      this._attemptCharCodeUntilFn(isNotWhitespace);\n      while (this._cursor.peek() !== chars.$SLASH && this._cursor.peek() !== chars.$GT) {\n        this._consumeAttributeName();\n        this._attemptCharCodeUntilFn(isNotWhitespace);\n        if (this._attemptCharCode(chars.$EQ)) {\n          this._attemptCharCodeUntilFn(isNotWhitespace);\n          this._consumeAttributeValue();\n        }\n        this._attemptCharCodeUntilFn(isNotWhitespace);\n      }\n      this._consumeTagOpenEnd();\n    } catch (e) {\n      if (e instanceof _ControlFlowError) {\n        // When the start tag is invalid (including invalid \"attributes\"), assume we want a \"<\"\n        this._cursor = innerStart;\n        if (openTagToken) {\n          this.tokens.length = tokensBeforeTagOpen;\n        }\n        // Back to back text tokens are merged at the end\n        this._beginToken(TokenType.TEXT, start);\n        this._endToken(['<']);\n        return;\n      }\n\n      throw e;\n    }\n\n    const contentTokenType = this._getTagDefinition(tagName).contentType;\n\n    if (contentTokenType === TagContentType.RAW_TEXT) {\n      this._consumeRawTextWithTagClose(prefix, tagName, false);\n    } else if (contentTokenType === TagContentType.ESCAPABLE_RAW_TEXT) {\n      this._consumeRawTextWithTagClose(prefix, tagName, true);\n    }\n  }\n\n  private _consumeRawTextWithTagClose(prefix: string, tagName: string, decodeEntities: boolean) {\n    const textToken = this._consumeRawText(decodeEntities, () => {\n      if (!this._attemptCharCode(chars.$LT)) return false;\n      if (!this._attemptCharCode(chars.$SLASH)) return false;\n      this._attemptCharCodeUntilFn(isNotWhitespace);\n      if (!this._attemptStrCaseInsensitive(tagName)) return false;\n      this._attemptCharCodeUntilFn(isNotWhitespace);\n      return this._attemptCharCode(chars.$GT);\n    });\n    this._beginToken(TokenType.TAG_CLOSE);\n    this._requireCharCodeUntilFn(code => code === chars.$GT, 3);\n    this._cursor.advance();  // Consume the `>`\n    this._endToken([prefix, tagName]);\n  }\n\n  private _consumeTagOpenStart(start: CharacterCursor) {\n    this._beginToken(TokenType.TAG_OPEN_START, start);\n    const parts = this._consumePrefixAndName();\n    return this._endToken(parts);\n  }\n\n  private _consumeAttributeName() {\n    const attrNameStart = this._cursor.peek();\n    if (attrNameStart === chars.$SQ || attrNameStart === chars.$DQ) {\n      throw this._createError(_unexpectedCharacterErrorMsg(attrNameStart), this._cursor.getSpan());\n    }\n    this._beginToken(TokenType.ATTR_NAME);\n    const prefixAndName = this._consumePrefixAndName();\n    this._endToken(prefixAndName);\n  }\n\n  private _consumeAttributeValue() {\n    let value: string;\n    if (this._cursor.peek() === chars.$SQ || this._cursor.peek() === chars.$DQ) {\n      this._beginToken(TokenType.ATTR_QUOTE);\n      const quoteChar = this._cursor.peek();\n      this._cursor.advance();\n      this._endToken([String.fromCodePoint(quoteChar)]);\n      this._beginToken(TokenType.ATTR_VALUE);\n      const parts: string[] = [];\n      while (this._cursor.peek() !== quoteChar) {\n        parts.push(this._readChar(true));\n      }\n      value = parts.join('');\n      this._endToken([this._processCarriageReturns(value)]);\n      this._beginToken(TokenType.ATTR_QUOTE);\n      this._cursor.advance();\n      this._endToken([String.fromCodePoint(quoteChar)]);\n    } else {\n      this._beginToken(TokenType.ATTR_VALUE);\n      const valueStart = this._cursor.clone();\n      this._requireCharCodeUntilFn(isNameEnd, 1);\n      value = this._cursor.getChars(valueStart);\n      this._endToken([this._processCarriageReturns(value)]);\n    }\n  }\n\n  private _consumeTagOpenEnd() {\n    const tokenType =\n        this._attemptCharCode(chars.$SLASH) ? TokenType.TAG_OPEN_END_VOID : TokenType.TAG_OPEN_END;\n    this._beginToken(tokenType);\n    this._requireCharCode(chars.$GT);\n    this._endToken([]);\n  }\n\n  private _consumeTagClose(start: CharacterCursor) {\n    this._beginToken(TokenType.TAG_CLOSE, start);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n    const prefixAndName = this._consumePrefixAndName();\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n    this._requireCharCode(chars.$GT);\n    this._endToken(prefixAndName);\n  }\n\n  private _consumeExpansionFormStart() {\n    this._beginToken(TokenType.EXPANSION_FORM_START);\n    this._requireCharCode(chars.$LBRACE);\n    this._endToken([]);\n\n    this._expansionCaseStack.push(TokenType.EXPANSION_FORM_START);\n\n    this._beginToken(TokenType.RAW_TEXT);\n    const condition = this._readUntil(chars.$COMMA);\n    this._endToken([condition]);\n    this._requireCharCode(chars.$COMMA);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n\n    this._beginToken(TokenType.RAW_TEXT);\n    const type = this._readUntil(chars.$COMMA);\n    this._endToken([type]);\n    this._requireCharCode(chars.$COMMA);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n  }\n\n  private _consumeExpansionCaseStart() {\n    this._beginToken(TokenType.EXPANSION_CASE_VALUE);\n    const value = this._readUntil(chars.$LBRACE).trim();\n    this._endToken([value]);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n\n    this._beginToken(TokenType.EXPANSION_CASE_EXP_START);\n    this._requireCharCode(chars.$LBRACE);\n    this._endToken([]);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n\n    this._expansionCaseStack.push(TokenType.EXPANSION_CASE_EXP_START);\n  }\n\n  private _consumeExpansionCaseEnd() {\n    this._beginToken(TokenType.EXPANSION_CASE_EXP_END);\n    this._requireCharCode(chars.$RBRACE);\n    this._endToken([]);\n    this._attemptCharCodeUntilFn(isNotWhitespace);\n\n    this._expansionCaseStack.pop();\n  }\n\n  private _consumeExpansionFormEnd() {\n    this._beginToken(TokenType.EXPANSION_FORM_END);\n    this._requireCharCode(chars.$RBRACE);\n    this._endToken([]);\n\n    this._expansionCaseStack.pop();\n  }\n\n  private _consumeText() {\n    const start = this._cursor.clone();\n    this._beginToken(TokenType.TEXT, start);\n    const parts: string[] = [];\n\n    do {\n      if (this._interpolationConfig && this._attemptStr(this._interpolationConfig.start)) {\n        parts.push(this._interpolationConfig.start);\n        this._inInterpolation = true;\n      } else if (\n          this._interpolationConfig && this._inInterpolation &&\n          this._attemptStr(this._interpolationConfig.end)) {\n        parts.push(this._interpolationConfig.end);\n        this._inInterpolation = false;\n      } else {\n        parts.push(this._readChar(true));\n      }\n    } while (!this._isTextEnd());\n\n    this._endToken([this._processCarriageReturns(parts.join(''))]);\n  }\n\n  private _isTextEnd(): boolean {\n    if (this._cursor.peek() === chars.$LT || this._cursor.peek() === chars.$EOF) {\n      return true;\n    }\n\n    if (this._tokenizeIcu && !this._inInterpolation) {\n      if (this.isExpansionFormStart()) {\n        // start of an expansion form\n        return true;\n      }\n\n      if (this._cursor.peek() === chars.$RBRACE && this._isInExpansionCase()) {\n        // end of and expansion case\n        return true;\n      }\n    }\n\n    return false;\n  }\n\n  private _readUntil(char: number): string {\n    const start = this._cursor.clone();\n    this._attemptUntilChar(char);\n    return this._cursor.getChars(start);\n  }\n\n  private _isInExpansionCase(): boolean {\n    return this._expansionCaseStack.length > 0 &&\n        this._expansionCaseStack[this._expansionCaseStack.length - 1] ===\n        TokenType.EXPANSION_CASE_EXP_START;\n  }\n\n  private _isInExpansionForm(): boolean {\n    return this._expansionCaseStack.length > 0 &&\n        this._expansionCaseStack[this._expansionCaseStack.length - 1] ===\n        TokenType.EXPANSION_FORM_START;\n  }\n\n  private isExpansionFormStart(): boolean {\n    if (this._cursor.peek() !== chars.$LBRACE) {\n      return false;\n    }\n    if (this._interpolationConfig) {\n      const start = this._cursor.clone();\n      const isInterpolation = this._attemptStr(this._interpolationConfig.start);\n      this._cursor = start;\n      return !isInterpolation;\n    }\n    return true;\n  }\n}\n\nfunction isNotWhitespace(code: number): boolean {\n  return !chars.isWhitespace(code) || code === chars.$EOF;\n}\n\nfunction isNameEnd(code: number): boolean {\n  return chars.isWhitespace(code) || code === chars.$GT || code === chars.$SLASH ||\n      code === chars.$SQ || code === chars.$DQ || code === chars.$EQ;\n}\n\nfunction isPrefixEnd(code: number): boolean {\n  return (code < chars.$a || chars.$z < code) && (code < chars.$A || chars.$Z < code) &&\n      (code < chars.$0 || code > chars.$9);\n}\n\nfunction isDigitEntityEnd(code: number): boolean {\n  return code == chars.$SEMICOLON || code == chars.$EOF || !chars.isAsciiHexDigit(code);\n}\n\nfunction isNamedEntityEnd(code: number): boolean {\n  return code == chars.$SEMICOLON || code == chars.$EOF || !chars.isAsciiLetter(code);\n}\n\nfunction isExpansionCaseStart(peek: number): boolean {\n  return peek !== chars.$RBRACE;\n}\n\nfunction compareCharCodeCaseInsensitive(code1: number, code2: number): boolean {\n  return toUpperCaseCharCode(code1) == toUpperCaseCharCode(code2);\n}\n\nfunction toUpperCaseCharCode(code: number): number {\n  return code >= chars.$a && code <= chars.$z ? code - chars.$a + chars.$A : code;\n}\n\nfunction mergeTextTokens(srcTokens: Token[]): Token[] {\n  const dstTokens: Token[] = [];\n  let lastDstToken: Token|undefined = undefined;\n  for (let i = 0; i < srcTokens.length; i++) {\n    const token = srcTokens[i];\n    if (lastDstToken && lastDstToken.type == TokenType.TEXT && token.type == TokenType.TEXT) {\n      lastDstToken.parts[0]! += token.parts[0];\n      lastDstToken.sourceSpan.end = token.sourceSpan.end;\n    } else {\n      lastDstToken = token;\n      dstTokens.push(lastDstToken);\n    }\n  }\n\n  return dstTokens;\n}\n\n\n/**\n * The _Tokenizer uses objects of this type to move through the input text,\n * extracting \"parsed characters\". These could be more than one actual character\n * if the text contains escape sequences.\n */\ninterface CharacterCursor {\n  /** Initialize the cursor. */\n  init(): void;\n  /** The parsed character at the current cursor position. */\n  peek(): number;\n  /** Advance the cursor by one parsed character. */\n  advance(): void;\n  /** Get a span from the marked start point to the current point. */\n  getSpan(start?: this, leadingTriviaCodePoints?: number[]): ParseSourceSpan;\n  /** Get the parsed characters from the marked start point to the current point. */\n  getChars(start: this): string;\n  /** The number of characters left before the end of the cursor. */\n  charsLeft(): number;\n  /** The number of characters between `this` cursor and `other` cursor. */\n  diff(other: this): number;\n  /** Make a copy of this cursor */\n  clone(): CharacterCursor;\n}\n\ninterface CursorState {\n  peek: number;\n  offset: number;\n  line: number;\n  column: number;\n}\n\nclass PlainCharacterCursor implements CharacterCursor {\n  protected state: CursorState;\n  protected file: ParseSourceFile;\n  protected input: string;\n  protected end: number;\n\n  constructor(fileOrCursor: PlainCharacterCursor);\n  constructor(fileOrCursor: ParseSourceFile, range: LexerRange);\n  constructor(fileOrCursor: ParseSourceFile|PlainCharacterCursor, range?: LexerRange) {\n    if (fileOrCursor instanceof PlainCharacterCursor) {\n      this.file = fileOrCursor.file;\n      this.input = fileOrCursor.input;\n      this.end = fileOrCursor.end;\n\n      const state = fileOrCursor.state;\n      // Note: avoid using `{...fileOrCursor.state}` here as that has a severe performance penalty.\n      // In ES5 bundles the object spread operator is translated into the `__assign` helper, which\n      // is not optimized by VMs as efficiently as a raw object literal. Since this constructor is\n      // called in tight loops, this difference matters.\n      this.state = {\n        peek: state.peek,\n        offset: state.offset,\n        line: state.line,\n        column: state.column,\n      };\n    } else {\n      if (!range) {\n        throw new Error(\n            'Programming error: the range argument must be provided with a file argument.');\n      }\n      this.file = fileOrCursor;\n      this.input = fileOrCursor.content;\n      this.end = range.endPos;\n      this.state = {\n        peek: -1,\n        offset: range.startPos,\n        line: range.startLine,\n        column: range.startCol,\n      };\n    }\n  }\n\n  clone(): PlainCharacterCursor {\n    return new PlainCharacterCursor(this);\n  }\n\n  peek() {\n    return this.state.peek;\n  }\n  charsLeft() {\n    return this.end - this.state.offset;\n  }\n  diff(other: this) {\n    return this.state.offset - other.state.offset;\n  }\n\n  advance(): void {\n    this.advanceState(this.state);\n  }\n\n  init(): void {\n    this.updatePeek(this.state);\n  }\n\n  getSpan(start?: this, leadingTriviaCodePoints?: number[]): ParseSourceSpan {\n    start = start || this;\n    let cloned = false;\n    if (leadingTriviaCodePoints) {\n      while (this.diff(start) > 0 && leadingTriviaCodePoints.indexOf(start.peek()) !== -1) {\n        if (!cloned) {\n          start = start.clone() as this;\n          cloned = true;\n        }\n        start.advance();\n      }\n    }\n    return new ParseSourceSpan(\n        new ParseLocation(start.file, start.state.offset, start.state.line, start.state.column),\n        new ParseLocation(this.file, this.state.offset, this.state.line, this.state.column));\n  }\n\n  getChars(start: this): string {\n    return this.input.substring(start.state.offset, this.state.offset);\n  }\n\n  charAt(pos: number): number {\n    return this.input.charCodeAt(pos);\n  }\n\n  protected advanceState(state: CursorState) {\n    if (state.offset >= this.end) {\n      this.state = state;\n      throw new CursorError('Unexpected character \"EOF\"', this);\n    }\n    const currentChar = this.charAt(state.offset);\n    if (currentChar === chars.$LF) {\n      state.line++;\n      state.column = 0;\n    } else if (!chars.isNewLine(currentChar)) {\n      state.column++;\n    }\n    state.offset++;\n    this.updatePeek(state);\n  }\n\n  protected updatePeek(state: CursorState): void {\n    state.peek = state.offset >= this.end ? chars.$EOF : this.charAt(state.offset);\n  }\n}\n\nclass EscapedCharacterCursor extends PlainCharacterCursor {\n  protected internalState: CursorState;\n\n  constructor(fileOrCursor: EscapedCharacterCursor);\n  constructor(fileOrCursor: ParseSourceFile, range: LexerRange);\n  constructor(fileOrCursor: ParseSourceFile|EscapedCharacterCursor, range?: LexerRange) {\n    if (fileOrCursor instanceof EscapedCharacterCursor) {\n      super(fileOrCursor);\n      this.internalState = {...fileOrCursor.internalState};\n    } else {\n      super(fileOrCursor, range!);\n      this.internalState = this.state;\n    }\n  }\n\n  advance(): void {\n    this.state = this.internalState;\n    super.advance();\n    this.processEscapeSequence();\n  }\n\n  init(): void {\n    super.init();\n    this.processEscapeSequence();\n  }\n\n  clone(): EscapedCharacterCursor {\n    return new EscapedCharacterCursor(this);\n  }\n\n  getChars(start: this): string {\n    const cursor = start.clone();\n    let chars = '';\n    while (cursor.internalState.offset < this.internalState.offset) {\n      chars += String.fromCodePoint(cursor.peek());\n      cursor.advance();\n    }\n    return chars;\n  }\n\n  /**\n   * Process the escape sequence that starts at the current position in the text.\n   *\n   * This method is called to ensure that `peek` has the unescaped value of escape sequences.\n   */\n  protected processEscapeSequence(): void {\n    const peek = () => this.internalState.peek;\n\n    if (peek() === chars.$BACKSLASH) {\n      // We have hit an escape sequence so we need the internal state to become independent\n      // of the external state.\n      this.internalState = {...this.state};\n\n      // Move past the backslash\n      this.advanceState(this.internalState);\n\n      // First check for standard control char sequences\n      if (peek() === chars.$n) {\n        this.state.peek = chars.$LF;\n      } else if (peek() === chars.$r) {\n        this.state.peek = chars.$CR;\n      } else if (peek() === chars.$v) {\n        this.state.peek = chars.$VTAB;\n      } else if (peek() === chars.$t) {\n        this.state.peek = chars.$TAB;\n      } else if (peek() === chars.$b) {\n        this.state.peek = chars.$BSPACE;\n      } else if (peek() === chars.$f) {\n        this.state.peek = chars.$FF;\n      }\n\n      // Now consider more complex sequences\n      else if (peek() === chars.$u) {\n        // Unicode code-point sequence\n        this.advanceState(this.internalState);  // advance past the `u` char\n        if (peek() === chars.$LBRACE) {\n          // Variable length Unicode, e.g. `\\x{123}`\n          this.advanceState(this.internalState);  // advance past the `{` char\n          // Advance past the variable number of hex digits until we hit a `}` char\n          const digitStart = this.clone();\n          let length = 0;\n          while (peek() !== chars.$RBRACE) {\n            this.advanceState(this.internalState);\n            length++;\n          }\n          this.state.peek = this.decodeHexDigits(digitStart, length);\n        } else {\n          // Fixed length Unicode, e.g. `\\u1234`\n          const digitStart = this.clone();\n          this.advanceState(this.internalState);\n          this.advanceState(this.internalState);\n          this.advanceState(this.internalState);\n          this.state.peek = this.decodeHexDigits(digitStart, 4);\n        }\n      }\n\n      else if (peek() === chars.$x) {\n        // Hex char code, e.g. `\\x2F`\n        this.advanceState(this.internalState);  // advance past the `x` char\n        const digitStart = this.clone();\n        this.advanceState(this.internalState);\n        this.state.peek = this.decodeHexDigits(digitStart, 2);\n      }\n\n      else if (chars.isOctalDigit(peek())) {\n        // Octal char code, e.g. `\\012`,\n        let octal = '';\n        let length = 0;\n        let previous = this.clone();\n        while (chars.isOctalDigit(peek()) && length < 3) {\n          previous = this.clone();\n          octal += String.fromCodePoint(peek());\n          this.advanceState(this.internalState);\n          length++;\n        }\n        this.state.peek = parseInt(octal, 8);\n        // Backup one char\n        this.internalState = previous.internalState;\n      }\n\n      else if (chars.isNewLine(this.internalState.peek)) {\n        // Line continuation `\\` followed by a new line\n        this.advanceState(this.internalState);  // advance over the newline\n        this.state = this.internalState;\n      }\n\n      else {\n        // If none of the `if` blocks were executed then we just have an escaped normal character.\n        // In that case we just, effectively, skip the backslash from the character.\n        this.state.peek = this.internalState.peek;\n      }\n    }\n  }\n\n  protected decodeHexDigits(start: EscapedCharacterCursor, length: number): number {\n    const hex = this.input.substr(start.internalState.offset, length);\n    const charCode = parseInt(hex, 16);\n    if (!isNaN(charCode)) {\n      return charCode;\n    } else {\n      start.state = start.internalState;\n      throw new CursorError('Invalid hexadecimal escape sequence', start);\n    }\n  }\n}\n\nexport class CursorError {\n  constructor(public msg: string, public cursor: CharacterCursor) {}\n}\n"]}