source: trip-planner-front/node_modules/@angular/compiler/src/expression_parser/parser.js@ eed0bf8

/**
 * @license
 * Copyright Google LLC 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/expression_parser/parser", ["require", "exports", "tslib", "@angular/compiler/src/chars", "@angular/compiler/src/ml_parser/interpolation_config", "@angular/compiler/src/expression_parser/ast", "@angular/compiler/src/expression_parser/lexer"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports._ParseAST = exports.IvyParser = exports.Parser = exports.TemplateBindingParseResult = exports.SplitInterpolation = void 0;
    var tslib_1 = require("tslib");
    var chars = require("@angular/compiler/src/chars");
    var interpolation_config_1 = require("@angular/compiler/src/ml_parser/interpolation_config");
    var ast_1 = require("@angular/compiler/src/expression_parser/ast");
    var lexer_1 = require("@angular/compiler/src/expression_parser/lexer");
    var SplitInterpolation = /** @class */ (function () {
        function SplitInterpolation(strings, expressions, offsets) {
            this.strings = strings;
            this.expressions = expressions;
            this.offsets = offsets;
        }
        return SplitInterpolation;
    }());
    exports.SplitInterpolation = SplitInterpolation;
    var TemplateBindingParseResult = /** @class */ (function () {
        function TemplateBindingParseResult(templateBindings, warnings, errors) {
            this.templateBindings = templateBindings;
            this.warnings = warnings;
            this.errors = errors;
        }
        return TemplateBindingParseResult;
    }());
    exports.TemplateBindingParseResult = TemplateBindingParseResult;
    var Parser = /** @class */ (function () {
        function Parser(_lexer) {
            this._lexer = _lexer;
            this.errors = [];
            this.simpleExpressionChecker = SimpleExpressionChecker;
        }
        Parser.prototype.parseAction = function (input, location, absoluteOffset, interpolationConfig) {
            if (interpolationConfig === void 0) { interpolationConfig = interpolation_config_1.DEFAULT_INTERPOLATION_CONFIG; }
            this._checkNoInterpolation(input, location, interpolationConfig);
            var sourceToLex = this._stripComments(input);
            var tokens = this._lexer.tokenize(this._stripComments(input));
            var ast = new _ParseAST(input, location, absoluteOffset, tokens, sourceToLex.length, true, this.errors, input.length - sourceToLex.length)
                .parseChain();
            return new ast_1.ASTWithSource(ast, input, location, absoluteOffset, this.errors);
        };
        Parser.prototype.parseBinding = function (input, location, absoluteOffset, interpolationConfig) {
            if (interpolationConfig === void 0) { interpolationConfig = interpolation_config_1.DEFAULT_INTERPOLATION_CONFIG; }
            var ast = this._parseBindingAst(input, location, absoluteOffset, interpolationConfig);
            return new ast_1.ASTWithSource(ast, input, location, absoluteOffset, this.errors);
        };
        Parser.prototype.checkSimpleExpression = function (ast) {
            var checker = new this.simpleExpressionChecker();
            ast.visit(checker);
            return checker.errors;
        };
        Parser.prototype.parseSimpleBinding = function (input, location, absoluteOffset, interpolationConfig) {
            if (interpolationConfig === void 0) { interpolationConfig = interpolation_config_1.DEFAULT_INTERPOLATION_CONFIG; }
            var ast = this._parseBindingAst(input, location, absoluteOffset, interpolationConfig);
            var errors = this.checkSimpleExpression(ast);
            if (errors.length > 0) {
                this._reportError("Host binding expression cannot contain " + errors.join(' '), input, location);
            }
            return new ast_1.ASTWithSource(ast, input, location, absoluteOffset, this.errors);
        };
        Parser.prototype._reportError = function (message, input, errLocation, ctxLocation) {
            this.errors.push(new ast_1.ParserError(message, input, errLocation, ctxLocation));
        };
        Parser.prototype._parseBindingAst = function (input, location, absoluteOffset, interpolationConfig) {
            // Quotes expressions use 3rd-party expression language. We don't want to use
            // our lexer or parser for that, so we check for that ahead of time.
            var quote = this._parseQuote(input, location, absoluteOffset);
            if (quote != null) {
                return quote;
            }
            this._checkNoInterpolation(input, location, interpolationConfig);
            var sourceToLex = this._stripComments(input);
            var tokens = this._lexer.tokenize(sourceToLex);
            return new _ParseAST(input, location, absoluteOffset, tokens, sourceToLex.length, false, this.errors, input.length - sourceToLex.length)
                .parseChain();
        };
        Parser.prototype._parseQuote = function (input, location, absoluteOffset) {
            if (input == null)
                return null;
            var prefixSeparatorIndex = input.indexOf(':');
            if (prefixSeparatorIndex == -1)
                return null;
            var prefix = input.substring(0, prefixSeparatorIndex).trim();
            if (!lexer_1.isIdentifier(prefix))
                return null;
            var uninterpretedExpression = input.substring(prefixSeparatorIndex + 1);
            var span = new ast_1.ParseSpan(0, input.length);
            return new ast_1.Quote(span, span.toAbsolute(absoluteOffset), prefix, uninterpretedExpression, location);
        };
        /**
         * Parse microsyntax template expression and return a list of bindings or
         * parsing errors in case the given expression is invalid.
         *
         * For example,
         * ```
         *   <div *ngFor="let item of items">
         *         ^      ^ absoluteValueOffset for `templateValue`
         *         absoluteKeyOffset for `templateKey`
         * ```
         * contains three bindings:
         * 1. ngFor -> null
         * 2. item -> NgForOfContext.$implicit
         * 3. ngForOf -> items
         *
         * This is apparent from the de-sugared template:
         * ```
         *   <ng-template ngFor let-item [ngForOf]="items">
         * ```
         *
         * @param templateKey name of directive, without the * prefix. For example: ngIf, ngFor
         * @param templateValue RHS of the microsyntax attribute
         * @param templateUrl template filename if it's external, component filename if it's inline
         * @param absoluteKeyOffset start of the `templateKey`
         * @param absoluteValueOffset start of the `templateValue`
         */
        Parser.prototype.parseTemplateBindings = function (templateKey, templateValue, templateUrl, absoluteKeyOffset, absoluteValueOffset) {
            var tokens = this._lexer.tokenize(templateValue);
            var parser = new _ParseAST(templateValue, templateUrl, absoluteValueOffset, tokens, templateValue.length, false /* parseAction */, this.errors, 0 /* relative offset */);
            return parser.parseTemplateBindings({
                source: templateKey,
                span: new ast_1.AbsoluteSourceSpan(absoluteKeyOffset, absoluteKeyOffset + templateKey.length),
            });
        };
        Parser.prototype.parseInterpolation = function (input, location, absoluteOffset, interpolationConfig) {
            if (interpolationConfig === void 0) { interpolationConfig = interpolation_config_1.DEFAULT_INTERPOLATION_CONFIG; }
            var _a = this.splitInterpolation(input, location, interpolationConfig), strings = _a.strings, expressions = _a.expressions, offsets = _a.offsets;
            if (expressions.length === 0)
                return null;
            var expressionNodes = [];
            for (var i = 0; i < expressions.length; ++i) {
                var expressionText = expressions[i].text;
                var sourceToLex = this._stripComments(expressionText);
                var tokens = this._lexer.tokenize(sourceToLex);
                var ast = new _ParseAST(input, location, absoluteOffset, tokens, sourceToLex.length, false, this.errors, offsets[i] + (expressionText.length - sourceToLex.length))
                    .parseChain();
                expressionNodes.push(ast);
            }
            return this.createInterpolationAst(strings.map(function (s) { return s.text; }), expressionNodes, input, location, absoluteOffset);
        };
        /**
         * Similar to `parseInterpolation`, but treats the provided string as a single expression
         * element that would normally appear within the interpolation prefix and suffix (`{{` and `}}`).
         * This is used for parsing the switch expression in ICUs.
         */
        Parser.prototype.parseInterpolationExpression = function (expression, location, absoluteOffset) {
            var sourceToLex = this._stripComments(expression);
            var tokens = this._lexer.tokenize(sourceToLex);
            var ast = new _ParseAST(expression, location, absoluteOffset, tokens, sourceToLex.length, 
            /* parseAction */ false, this.errors, 0)
                .parseChain();
            var strings = ['', '']; // The prefix and suffix strings are both empty
            return this.createInterpolationAst(strings, [ast], expression, location, absoluteOffset);
        };
        Parser.prototype.createInterpolationAst = function (strings, expressions, input, location, absoluteOffset) {
            var span = new ast_1.ParseSpan(0, input.length);
            var interpolation = new ast_1.Interpolation(span, span.toAbsolute(absoluteOffset), strings, expressions);
            return new ast_1.ASTWithSource(interpolation, input, location, absoluteOffset, this.errors);
        };
        /**
         * Splits a string of text into "raw" text segments and expressions present in interpolations in
         * the string.
         * Returns `null` if there are no interpolations, otherwise a
         * `SplitInterpolation` with splits that look like
         *   <raw text> <expression> <raw text> ... <raw text> <expression> <raw text>
         */
        Parser.prototype.splitInterpolation = function (input, location, interpolationConfig) {
            if (interpolationConfig === void 0) { interpolationConfig = interpolation_config_1.DEFAULT_INTERPOLATION_CONFIG; }
            var strings = [];
            var expressions = [];
            var offsets = [];
            var i = 0;
            var atInterpolation = false;
            var extendLastString = false;
            var interpStart = interpolationConfig.start, interpEnd = interpolationConfig.end;
            while (i < input.length) {
                if (!atInterpolation) {
                    // parse until starting {{
                    var start = i;
                    i = input.indexOf(interpStart, i);
                    if (i === -1) {
                        i = input.length;
                    }
                    var text = input.substring(start, i);
                    strings.push({ text: text, start: start, end: i });
                    atInterpolation = true;
                }
                else {
                    // parse from starting {{ to ending }} while ignoring content inside quotes.
                    var fullStart = i;
                    var exprStart = fullStart + interpStart.length;
                    var exprEnd = this._getInterpolationEndIndex(input, interpEnd, exprStart);
                    if (exprEnd === -1) {
                        // Could not find the end of the interpolation; do not parse an expression.
                        // Instead we should extend the content on the last raw string.
                        atInterpolation = false;
                        extendLastString = true;
                        break;
                    }
                    var fullEnd = exprEnd + interpEnd.length;
                    var text = input.substring(exprStart, exprEnd);
                    if (text.trim().length === 0) {
                        this._reportError('Blank expressions are not allowed in interpolated strings', input, "at column " + i + " in", location);
                    }
                    expressions.push({ text: text, start: fullStart, end: fullEnd });
                    offsets.push(exprStart);
                    i = fullEnd;
                    atInterpolation = false;
                }
            }
            if (!atInterpolation) {
                // If we are now at a text section, add the remaining content as a raw string.
                if (extendLastString) {
                    var piece = strings[strings.length - 1];
                    piece.text += input.substring(i);
                    piece.end = input.length;
                }
                else {
                    strings.push({ text: input.substring(i), start: i, end: input.length });
                }
            }
            return new SplitInterpolation(strings, expressions, offsets);
        };
        Parser.prototype.wrapLiteralPrimitive = function (input, location, absoluteOffset) {
            var span = new ast_1.ParseSpan(0, input == null ? 0 : input.length);
            return new ast_1.ASTWithSource(new ast_1.LiteralPrimitive(span, span.toAbsolute(absoluteOffset), input), input, location, absoluteOffset, this.errors);
        };
        Parser.prototype._stripComments = function (input) {
            var i = this._commentStart(input);
            return i != null ? input.substring(0, i).trim() : input;
        };
        Parser.prototype._commentStart = function (input) {
            var outerQuote = null;
            for (var i = 0; i < input.length - 1; i++) {
                var char = input.charCodeAt(i);
                var nextChar = input.charCodeAt(i + 1);
                if (char === chars.$SLASH && nextChar == chars.$SLASH && outerQuote == null)
                    return i;
                if (outerQuote === char) {
                    outerQuote = null;
                }
                else if (outerQuote == null && chars.isQuote(char)) {
                    outerQuote = char;
                }
            }
            return null;
        };
        Parser.prototype._checkNoInterpolation = function (input, location, _a) {
            var e_1, _b;
            var start = _a.start, end = _a.end;
            var startIndex = -1;
            var endIndex = -1;
            try {
                for (var _c = tslib_1.__values(this._forEachUnquotedChar(input, 0)), _d = _c.next(); !_d.done; _d = _c.next()) {
                    var charIndex = _d.value;
                    if (startIndex === -1) {
                        if (input.startsWith(start)) {
                            startIndex = charIndex;
                        }
                    }
                    else {
                        endIndex = this._getInterpolationEndIndex(input, end, charIndex);
                        if (endIndex > -1) {
                            break;
                        }
                    }
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (_d && !_d.done && (_b = _c.return)) _b.call(_c);
                }
                finally { if (e_1) throw e_1.error; }
            }
            if (startIndex > -1 && endIndex > -1) {
                this._reportError("Got interpolation (" + start + end + ") where expression was expected", input, "at column " + startIndex + " in", location);
            }
        };
        /**
         * Finds the index of the end of an interpolation expression
         * while ignoring comments and quoted content.
         */
        Parser.prototype._getInterpolationEndIndex = function (input, expressionEnd, start) {
            var e_2, _a;
            try {
                for (var _b = tslib_1.__values(this._forEachUnquotedChar(input, start)), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var charIndex = _c.value;
                    if (input.startsWith(expressionEnd, charIndex)) {
                        return charIndex;
                    }
                    // Nothing else in the expression matters after we've
                    // hit a comment so look directly for the end token.
                    if (input.startsWith('//', charIndex)) {
                        return input.indexOf(expressionEnd, charIndex);
                    }
                }
            }
            catch (e_2_1) { e_2 = { error: e_2_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_2) throw e_2.error; }
            }
            return -1;
        };
        /**
         * Generator used to iterate over the character indexes of a string that are outside of quotes.
         * @param input String to loop through.
         * @param start Index within the string at which to start.
         */
        Parser.prototype._forEachUnquotedChar = function (input, start) {
            var currentQuote, escapeCount, i, char;
            return tslib_1.__generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        currentQuote = null;
                        escapeCount = 0;
                        i = start;
                        _a.label = 1;
                    case 1:
                        if (!(i < input.length)) return [3 /*break*/, 6];
                        char = input[i];
                        if (!(chars.isQuote(input.charCodeAt(i)) && (currentQuote === null || currentQuote === char) &&
                            escapeCount % 2 === 0)) return [3 /*break*/, 2];
                        currentQuote = currentQuote === null ? char : null;
                        return [3 /*break*/, 4];
                    case 2:
                        if (!(currentQuote === null)) return [3 /*break*/, 4];
                        return [4 /*yield*/, i];
                    case 3:
                        _a.sent();
                        _a.label = 4;
                    case 4:
                        escapeCount = char === '\\' ? escapeCount + 1 : 0;
                        _a.label = 5;
                    case 5:
                        i++;
                        return [3 /*break*/, 1];
                    case 6: return [2 /*return*/];
                }
            });
        };
        return Parser;
    }());
    exports.Parser = Parser;
    var IvyParser = /** @class */ (function (_super) {
        tslib_1.__extends(IvyParser, _super);
        function IvyParser() {
            var _this = _super !== null && _super.apply(this, arguments) || this;
            _this.simpleExpressionChecker = IvySimpleExpressionChecker;
            return _this;
        }
        return IvyParser;
    }(Parser));
    exports.IvyParser = IvyParser;
    /** Describes a stateful context an expression parser is in. */
    var ParseContextFlags;
    (function (ParseContextFlags) {
        ParseContextFlags[ParseContextFlags["None"] = 0] = "None";
        /**
         * A Writable context is one in which a value may be written to an lvalue.
         * For example, after we see a property access, we may expect a write to the
         * property via the "=" operator.
         *   prop
         *        ^ possible "=" after
         */
        ParseContextFlags[ParseContextFlags["Writable"] = 1] = "Writable";
    })(ParseContextFlags || (ParseContextFlags = {}));
    var _ParseAST = /** @class */ (function () {
        function _ParseAST(input, location, absoluteOffset, tokens, inputLength, parseAction, errors, offset) {
            this.input = input;
            this.location = location;
            this.absoluteOffset = absoluteOffset;
            this.tokens = tokens;
            this.inputLength = inputLength;
            this.parseAction = parseAction;
            this.errors = errors;
            this.offset = offset;
            this.rparensExpected = 0;
            this.rbracketsExpected = 0;
            this.rbracesExpected = 0;
            this.context = ParseContextFlags.None;
            // Cache of expression start and input indeces to the absolute source span they map to, used to
            // prevent creating superfluous source spans in `sourceSpan`.
            // A serial of the expression start and input index is used for mapping because both are stateful
            // and may change for subsequent expressions visited by the parser.
            this.sourceSpanCache = new Map();
            this.index = 0;
        }
        _ParseAST.prototype.peek = function (offset) {
            var i = this.index + offset;
            return i < this.tokens.length ? this.tokens[i] : lexer_1.EOF;
        };
        Object.defineProperty(_ParseAST.prototype, "next", {
            get: function () {
                return this.peek(0);
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(_ParseAST.prototype, "atEOF", {
            /** Whether all the parser input has been processed. */
            get: function () {
                return this.index >= this.tokens.length;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(_ParseAST.prototype, "inputIndex", {
            /**
             * Index of the next token to be processed, or the end of the last token if all have been
             * processed.
             */
            get: function () {
                return this.atEOF ? this.currentEndIndex : this.next.index + this.offset;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(_ParseAST.prototype, "currentEndIndex", {
            /**
             * End index of the last processed token, or the start of the first token if none have been
             * processed.
             */
            get: function () {
                if (this.index > 0) {
                    var curToken = this.peek(-1);
                    return curToken.end + this.offset;
                }
                // No tokens have been processed yet; return the next token's start or the length of the input
                // if there is no token.
                if (this.tokens.length === 0) {
                    return this.inputLength + this.offset;
                }
                return this.next.index + this.offset;
            },
            enumerable: false,
            configurable: true
        });
        Object.defineProperty(_ParseAST.prototype, "currentAbsoluteOffset", {
            /**
             * Returns the absolute offset of the start of the current token.
             */
            get: function () {
                return this.absoluteOffset + this.inputIndex;
            },
            enumerable: false,
            configurable: true
        });
        /**
         * Retrieve a `ParseSpan` from `start` to the current position (or to `artificialEndIndex` if
         * provided).
         *
         * @param start Position from which the `ParseSpan` will start.
         * @param artificialEndIndex Optional ending index to be used if provided (and if greater than the
         *     natural ending index)
         */
        _ParseAST.prototype.span = function (start, artificialEndIndex) {
            var endIndex = this.currentEndIndex;
            if (artificialEndIndex !== undefined && artificialEndIndex > this.currentEndIndex) {
                endIndex = artificialEndIndex;
            }
            // In some unusual parsing scenarios (like when certain tokens are missing and an `EmptyExpr` is
            // being created), the current token may already be advanced beyond the `currentEndIndex`. This
            // appears to be a deep-seated parser bug.
            //
            // As a workaround for now, swap the start and end indices to ensure a valid `ParseSpan`.
            // TODO(alxhub): fix the bug upstream in the parser state, and remove this workaround.
            if (start > endIndex) {
                var tmp = endIndex;
                endIndex = start;
                start = tmp;
            }
            return new ast_1.ParseSpan(start, endIndex);
        };
        _ParseAST.prototype.sourceSpan = function (start, artificialEndIndex) {
            var serial = start + "@" + this.inputIndex + ":" + artificialEndIndex;
            if (!this.sourceSpanCache.has(serial)) {
                this.sourceSpanCache.set(serial, this.span(start, artificialEndIndex).toAbsolute(this.absoluteOffset));
            }
            return this.sourceSpanCache.get(serial);
        };
        _ParseAST.prototype.advance = function () {
            this.index++;
        };
        /**
         * Executes a callback in the provided context.
         */
        _ParseAST.prototype.withContext = function (context, cb) {
            this.context |= context;
            var ret = cb();
            this.context ^= context;
            return ret;
        };
        _ParseAST.prototype.consumeOptionalCharacter = function (code) {
            if (this.next.isCharacter(code)) {
                this.advance();
                return true;
            }
            else {
                return false;
            }
        };
        _ParseAST.prototype.peekKeywordLet = function () {
            return this.next.isKeywordLet();
        };
        _ParseAST.prototype.peekKeywordAs = function () {
            return this.next.isKeywordAs();
        };
        /**
         * Consumes an expected character, otherwise emits an error about the missing expected character
         * and skips over the token stream until reaching a recoverable point.
         *
         * See `this.error` and `this.skip` for more details.
         */
        _ParseAST.prototype.expectCharacter = function (code) {
            if (this.consumeOptionalCharacter(code))
                return;
            this.error("Missing expected " + String.fromCharCode(code));
        };
        _ParseAST.prototype.consumeOptionalOperator = function (op) {
            if (this.next.isOperator(op)) {
                this.advance();
                return true;
            }
            else {
                return false;
            }
        };
        _ParseAST.prototype.expectOperator = function (operator) {
            if (this.consumeOptionalOperator(operator))
                return;
            this.error("Missing expected operator " + operator);
        };
        _ParseAST.prototype.prettyPrintToken = function (tok) {
            return tok === lexer_1.EOF ? 'end of input' : "token " + tok;
        };
        _ParseAST.prototype.expectIdentifierOrKeyword = function () {
            var n = this.next;
            if (!n.isIdentifier() && !n.isKeyword()) {
                if (n.isPrivateIdentifier()) {
                    this._reportErrorForPrivateIdentifier(n, 'expected identifier or keyword');
                }
                else {
                    this.error("Unexpected " + this.prettyPrintToken(n) + ", expected identifier or keyword");
                }
                return null;
            }
            this.advance();
            return n.toString();
        };
        _ParseAST.prototype.expectIdentifierOrKeywordOrString = function () {
            var n = this.next;
            if (!n.isIdentifier() && !n.isKeyword() && !n.isString()) {
                if (n.isPrivateIdentifier()) {
                    this._reportErrorForPrivateIdentifier(n, 'expected identifier, keyword or string');
                }
                else {
                    this.error("Unexpected " + this.prettyPrintToken(n) + ", expected identifier, keyword, or string");
                }
                return '';
            }
            this.advance();
            return n.toString();
        };
        _ParseAST.prototype.parseChain = function () {
            var exprs = [];
            var start = this.inputIndex;
            while (this.index < this.tokens.length) {
                var expr = this.parsePipe();
                exprs.push(expr);
                if (this.consumeOptionalCharacter(chars.$SEMICOLON)) {
                    if (!this.parseAction) {
                        this.error('Binding expression cannot contain chained expression');
                    }
                    while (this.consumeOptionalCharacter(chars.$SEMICOLON)) {
                    } // read all semicolons
                }
                else if (this.index < this.tokens.length) {
                    this.error("Unexpected token '" + this.next + "'");
                }
            }
            if (exprs.length == 0) {
                // We have no expressions so create an empty expression that spans the entire input length
                var artificialStart = this.offset;
                var artificialEnd = this.offset + this.inputLength;
                return new ast_1.EmptyExpr(this.span(artificialStart, artificialEnd), this.sourceSpan(artificialStart, artificialEnd));
            }
            if (exprs.length == 1)
                return exprs[0];
            return new ast_1.Chain(this.span(start), this.sourceSpan(start), exprs);
        };
        _ParseAST.prototype.parsePipe = function () {
            var start = this.inputIndex;
            var result = this.parseExpression();
            if (this.consumeOptionalOperator('|')) {
                if (this.parseAction) {
                    this.error('Cannot have a pipe in an action expression');
                }
                do {
                    var nameStart = this.inputIndex;
                    var nameId = this.expectIdentifierOrKeyword();
                    var nameSpan = void 0;
                    var fullSpanEnd = undefined;
                    if (nameId !== null) {
                        nameSpan = this.sourceSpan(nameStart);
                    }
                    else {
                        // No valid identifier was found, so we'll assume an empty pipe name ('').
                        nameId = '';
                        // However, there may have been whitespace present between the pipe character and the next
                        // token in the sequence (or the end of input). We want to track this whitespace so that
                        // the `BindingPipe` we produce covers not just the pipe character, but any trailing
                        // whitespace beyond it. Another way of thinking about this is that the zero-length name
                        // is assumed to be at the end of any whitespace beyond the pipe character.
                        //
                        // Therefore, we push the end of the `ParseSpan` for this pipe all the way up to the
                        // beginning of the next token, or until the end of input if the next token is EOF.
                        fullSpanEnd = this.next.index !== -1 ? this.next.index : this.inputLength + this.offset;
                        // The `nameSpan` for an empty pipe name is zero-length at the end of any whitespace
                        // beyond the pipe character.
                        nameSpan = new ast_1.ParseSpan(fullSpanEnd, fullSpanEnd).toAbsolute(this.absoluteOffset);
                    }
                    var args = [];
                    while (this.consumeOptionalCharacter(chars.$COLON)) {
                        args.push(this.parseExpression());
                        // If there are additional expressions beyond the name, then the artificial end for the
                        // name is no longer relevant.
                    }
                    result = new ast_1.BindingPipe(this.span(start), this.sourceSpan(start, fullSpanEnd), result, nameId, args, nameSpan);
                } while (this.consumeOptionalOperator('|'));
            }
            return result;
        };
        _ParseAST.prototype.parseExpression = function () {
            return this.parseConditional();
        };
        _ParseAST.prototype.parseConditional = function () {
            var start = this.inputIndex;
            var result = this.parseLogicalOr();
            if (this.consumeOptionalOperator('?')) {
                var yes = this.parsePipe();
                var no = void 0;
                if (!this.consumeOptionalCharacter(chars.$COLON)) {
                    var end = this.inputIndex;
                    var expression = this.input.substring(start, end);
                    this.error("Conditional expression " + expression + " requires all 3 expressions");
                    no = new ast_1.EmptyExpr(this.span(start), this.sourceSpan(start));
                }
                else {
                    no = this.parsePipe();
                }
                return new ast_1.Conditional(this.span(start), this.sourceSpan(start), result, yes, no);
            }
            else {
                return result;
            }
        };
        _ParseAST.prototype.parseLogicalOr = function () {
            // '||'
            var start = this.inputIndex;
            var result = this.parseLogicalAnd();
            while (this.consumeOptionalOperator('||')) {
                var right = this.parseLogicalAnd();
                result = new ast_1.Binary(this.span(start), this.sourceSpan(start), '||', result, right);
            }
            return result;
        };
        _ParseAST.prototype.parseLogicalAnd = function () {
            // '&&'
            var start = this.inputIndex;
            var result = this.parseNullishCoalescing();
            while (this.consumeOptionalOperator('&&')) {
                var right = this.parseNullishCoalescing();
                result = new ast_1.Binary(this.span(start), this.sourceSpan(start), '&&', result, right);
            }
            return result;
        };
        _ParseAST.prototype.parseNullishCoalescing = function () {
            // '??'
            var start = this.inputIndex;
            var result = this.parseEquality();
            while (this.consumeOptionalOperator('??')) {
                var right = this.parseEquality();
                result = new ast_1.Binary(this.span(start), this.sourceSpan(start), '??', result, right);
            }
            return result;
        };
        _ParseAST.prototype.parseEquality = function () {
            // '==','!=','===','!=='
            var start = this.inputIndex;
            var result = this.parseRelational();
            while (this.next.type == lexer_1.TokenType.Operator) {
                var operator = this.next.strValue;
                switch (operator) {
                    case '==':
                    case '===':
                    case '!=':
                    case '!==':
                        this.advance();
                        var right = this.parseRelational();
                        result = new ast_1.Binary(this.span(start), this.sourceSpan(start), operator, result, right);
                        continue;
                }
                break;
            }
            return result;
        };
        _ParseAST.prototype.parseRelational = function () {
            // '<', '>', '<=', '>='
            var start = this.inputIndex;
            var result = this.parseAdditive();
            while (this.next.type == lexer_1.TokenType.Operator) {
                var operator = this.next.strValue;
                switch (operator) {
                    case '<':
                    case '>':
                    case '<=':
                    case '>=':
                        this.advance();
                        var right = this.parseAdditive();
                        result = new ast_1.Binary(this.span(start), this.sourceSpan(start), operator, result, right);
                        continue;
                }
                break;
            }
            return result;
        };
        _ParseAST.prototype.parseAdditive = function () {
            // '+', '-'
            var start = this.inputIndex;
            var result = this.parseMultiplicative();
            while (this.next.type == lexer_1.TokenType.Operator) {
                var operator = this.next.strValue;
                switch (operator) {
                    case '+':
                    case '-':
                        this.advance();
                        var right = this.parseMultiplicative();
                        result = new ast_1.Binary(this.span(start), this.sourceSpan(start), operator, result, right);
                        continue;
                }
                break;
            }
            return result;
        };
        _ParseAST.prototype.parseMultiplicative = function () {
            // '*', '%', '/'
            var start = this.inputIndex;
            var result = this.parsePrefix();
            while (this.next.type == lexer_1.TokenType.Operator) {
                var operator = this.next.strValue;
                switch (operator) {
                    case '*':
                    case '%':
                    case '/':
                        this.advance();
                        var right = this.parsePrefix();
                        result = new ast_1.Binary(this.span(start), this.sourceSpan(start), operator, result, right);
                        continue;
                }
                break;
            }
            return result;
        };
        _ParseAST.prototype.parsePrefix = function () {
            if (this.next.type == lexer_1.TokenType.Operator) {
                var start = this.inputIndex;
                var operator = this.next.strValue;
                var result = void 0;
                switch (operator) {
                    case '+':
                        this.advance();
                        result = this.parsePrefix();
                        return ast_1.Unary.createPlus(this.span(start), this.sourceSpan(start), result);
                    case '-':
                        this.advance();
                        result = this.parsePrefix();
                        return ast_1.Unary.createMinus(this.span(start), this.sourceSpan(start), result);
                    case '!':
                        this.advance();
                        result = this.parsePrefix();
                        return new ast_1.PrefixNot(this.span(start), this.sourceSpan(start), result);
                }
            }
            return this.parseCallChain();
        };
        _ParseAST.prototype.parseCallChain = function () {
            var start = this.inputIndex;
            var result = this.parsePrimary();
            while (true) {
                if (this.consumeOptionalCharacter(chars.$PERIOD)) {
                    result = this.parseAccessMemberOrMethodCall(result, start, false);
                }
                else if (this.consumeOptionalOperator('?.')) {
                    result = this.consumeOptionalCharacter(chars.$LBRACKET) ?
                        this.parseKeyedReadOrWrite(result, start, true) :
                        this.parseAccessMemberOrMethodCall(result, start, true);
                }
                else if (this.consumeOptionalCharacter(chars.$LBRACKET)) {
                    result = this.parseKeyedReadOrWrite(result, start, false);
                }
                else if (this.consumeOptionalCharacter(chars.$LPAREN)) {
                    this.rparensExpected++;
                    var args = this.parseCallArguments();
                    this.rparensExpected--;
                    this.expectCharacter(chars.$RPAREN);
                    result = new ast_1.FunctionCall(this.span(start), this.sourceSpan(start), result, args);
                }
                else if (this.consumeOptionalOperator('!')) {
                    result = new ast_1.NonNullAssert(this.span(start), this.sourceSpan(start), result);
                }
                else {
                    return result;
                }
            }
        };
        _ParseAST.prototype.parsePrimary = function () {
            var start = this.inputIndex;
            if (this.consumeOptionalCharacter(chars.$LPAREN)) {
                this.rparensExpected++;
                var result = this.parsePipe();
                this.rparensExpected--;
                this.expectCharacter(chars.$RPAREN);
                return result;
            }
            else if (this.next.isKeywordNull()) {
                this.advance();
                return new ast_1.LiteralPrimitive(this.span(start), this.sourceSpan(start), null);
            }
            else if (this.next.isKeywordUndefined()) {
                this.advance();
                return new ast_1.LiteralPrimitive(this.span(start), this.sourceSpan(start), void 0);
            }
            else if (this.next.isKeywordTrue()) {
                this.advance();
                return new ast_1.LiteralPrimitive(this.span(start), this.sourceSpan(start), true);
            }
            else if (this.next.isKeywordFalse()) {
                this.advance();
                return new ast_1.LiteralPrimitive(this.span(start), this.sourceSpan(start), false);
            }
            else if (this.next.isKeywordThis()) {
                this.advance();
                return new ast_1.ThisReceiver(this.span(start), this.sourceSpan(start));
            }
            else if (this.consumeOptionalCharacter(chars.$LBRACKET)) {
                this.rbracketsExpected++;
                var elements = this.parseExpressionList(chars.$RBRACKET);
                this.rbracketsExpected--;
                this.expectCharacter(chars.$RBRACKET);
                return new ast_1.LiteralArray(this.span(start), this.sourceSpan(start), elements);
            }
            else if (this.next.isCharacter(chars.$LBRACE)) {
                return this.parseLiteralMap();
            }
            else if (this.next.isIdentifier()) {
                return this.parseAccessMemberOrMethodCall(new ast_1.ImplicitReceiver(this.span(start), this.sourceSpan(start)), start, false);
            }
            else if (this.next.isNumber()) {
                var value = this.next.toNumber();
                this.advance();
                return new ast_1.LiteralPrimitive(this.span(start), this.sourceSpan(start), value);
            }
            else if (this.next.isString()) {
                var literalValue = this.next.toString();
                this.advance();
                return new ast_1.LiteralPrimitive(this.span(start), this.sourceSpan(start), literalValue);
            }
            else if (this.next.isPrivateIdentifier()) {
                this._reportErrorForPrivateIdentifier(this.next, null);
                return new ast_1.EmptyExpr(this.span(start), this.sourceSpan(start));
            }
            else if (this.index >= this.tokens.length) {
                this.error("Unexpected end of expression: " + this.input);
                return new ast_1.EmptyExpr(this.span(start), this.sourceSpan(start));
            }
            else {
                this.error("Unexpected token " + this.next);
                return new ast_1.EmptyExpr(this.span(start), this.sourceSpan(start));
            }
        };
        _ParseAST.prototype.parseExpressionList = function (terminator) {
            var result = [];
            do {
                if (!this.next.isCharacter(terminator)) {
                    result.push(this.parsePipe());
                }
                else {
                    break;
                }
            } while (this.consumeOptionalCharacter(chars.$COMMA));
            return result;
        };
        _ParseAST.prototype.parseLiteralMap = function () {
            var keys = [];
            var values = [];
            var start = this.inputIndex;
            this.expectCharacter(chars.$LBRACE);
            if (!this.consumeOptionalCharacter(chars.$RBRACE)) {
                this.rbracesExpected++;
                do {
                    var keyStart = this.inputIndex;
                    var quoted = this.next.isString();
                    var key = this.expectIdentifierOrKeywordOrString();
                    keys.push({ key: key, quoted: quoted });
                    // Properties with quoted keys can't use the shorthand syntax.
                    if (quoted) {
                        this.expectCharacter(chars.$COLON);
                        values.push(this.parsePipe());
                    }
                    else if (this.consumeOptionalCharacter(chars.$COLON)) {
                        values.push(this.parsePipe());
                    }
                    else {
                        var span = this.span(keyStart);
                        var sourceSpan = this.sourceSpan(keyStart);
                        values.push(new ast_1.PropertyRead(span, sourceSpan, sourceSpan, new ast_1.ImplicitReceiver(span, sourceSpan), key));
                    }
                } while (this.consumeOptionalCharacter(chars.$COMMA));
                this.rbracesExpected--;
                this.expectCharacter(chars.$RBRACE);
            }
            return new ast_1.LiteralMap(this.span(start), this.sourceSpan(start), keys, values);
        };
        _ParseAST.prototype.parseAccessMemberOrMethodCall = function (receiver, start, isSafe) {
            var _this = this;
            var nameStart = this.inputIndex;
            var id = this.withContext(ParseContextFlags.Writable, function () {
                var _a;
                var id = (_a = _this.expectIdentifierOrKeyword()) !== null && _a !== void 0 ? _a : '';
                if (id.length === 0) {
                    _this.error("Expected identifier for property access", receiver.span.end);
                }
                return id;
            });
            var nameSpan = this.sourceSpan(nameStart);
            if (this.consumeOptionalCharacter(chars.$LPAREN)) {
                var argumentStart = this.inputIndex;
                this.rparensExpected++;
                var args = this.parseCallArguments();
                var argumentSpan = this.span(argumentStart, this.inputIndex).toAbsolute(this.absoluteOffset);
                this.expectCharacter(chars.$RPAREN);
                this.rparensExpected--;
                var span = this.span(start);
                var sourceSpan = this.sourceSpan(start);
                return isSafe ?
                    new ast_1.SafeMethodCall(span, sourceSpan, nameSpan, receiver, id, args, argumentSpan) :
                    new ast_1.MethodCall(span, sourceSpan, nameSpan, receiver, id, args, argumentSpan);
            }
            else {
                if (isSafe) {
                    if (this.consumeOptionalOperator('=')) {
                        this.error('The \'?.\' operator cannot be used in the assignment');
                        return new ast_1.EmptyExpr(this.span(start), this.sourceSpan(start));
                    }
                    else {
                        return new ast_1.SafePropertyRead(this.span(start), this.sourceSpan(start), nameSpan, receiver, id);
                    }
                }
                else {
                    if (this.consumeOptionalOperator('=')) {
                        if (!this.parseAction) {
                            this.error('Bindings cannot contain assignments');
                            return new ast_1.EmptyExpr(this.span(start), this.sourceSpan(start));
                        }
                        var value = this.parseConditional();
                        return new ast_1.PropertyWrite(this.span(start), this.sourceSpan(start), nameSpan, receiver, id, value);
                    }
                    else {
                        return new ast_1.PropertyRead(this.span(start), this.sourceSpan(start), nameSpan, receiver, id);
                    }
                }
            }
        };
        _ParseAST.prototype.parseCallArguments = function () {
            if (this.next.isCharacter(chars.$RPAREN))
                return [];
            var positionals = [];
            do {
                positionals.push(this.parsePipe());
            } while (this.consumeOptionalCharacter(chars.$COMMA));
            return positionals;
        };
        /**
         * Parses an identifier, a keyword, a string with an optional `-` in between,
         * and returns the string along with its absolute source span.
         */
        _ParseAST.prototype.expectTemplateBindingKey = function () {
            var result = '';
            var operatorFound = false;
            var start = this.currentAbsoluteOffset;
            do {
                result += this.expectIdentifierOrKeywordOrString();
                operatorFound = this.consumeOptionalOperator('-');
                if (operatorFound) {
                    result += '-';
                }
            } while (operatorFound);
            return {
                source: result,
                span: new ast_1.AbsoluteSourceSpan(start, start + result.length),
            };
        };
        /**
         * Parse microsyntax template expression and return a list of bindings or
         * parsing errors in case the given expression is invalid.
         *
         * For example,
         * ```
         *   <div *ngFor="let item of items; index as i; trackBy: func">
         * ```
         * contains five bindings:
         * 1. ngFor -> null
         * 2. item -> NgForOfContext.$implicit
         * 3. ngForOf -> items
         * 4. i -> NgForOfContext.index
         * 5. ngForTrackBy -> func
         *
         * For a full description of the microsyntax grammar, see
         * https://gist.github.com/mhevery/d3530294cff2e4a1b3fe15ff75d08855
         *
         * @param templateKey name of the microsyntax directive, like ngIf, ngFor,
         * without the *, along with its absolute span.
         */
        _ParseAST.prototype.parseTemplateBindings = function (templateKey) {
            var bindings = [];
            // The first binding is for the template key itself
            // In *ngFor="let item of items", key = "ngFor", value = null
            // In *ngIf="cond | pipe", key = "ngIf", value = "cond | pipe"
            bindings.push.apply(bindings, tslib_1.__spreadArray([], tslib_1.__read(this.parseDirectiveKeywordBindings(templateKey))));
            while (this.index < this.tokens.length) {
                // If it starts with 'let', then this must be variable declaration
                var letBinding = this.parseLetBinding();
                if (letBinding) {
                    bindings.push(letBinding);
                }
                else {
                    // Two possible cases here, either `value "as" key` or
                    // "directive-keyword expression". We don't know which case, but both
                    // "value" and "directive-keyword" are template binding key, so consume
                    // the key first.
                    var key = this.expectTemplateBindingKey();
                    // Peek at the next token, if it is "as" then this must be variable
                    // declaration.
                    var binding = this.parseAsBinding(key);
                    if (binding) {
                        bindings.push(binding);
                    }
                    else {
                        // Otherwise the key must be a directive keyword, like "of". Transform
                        // the key to actual key. Eg. of -> ngForOf, trackBy -> ngForTrackBy
                        key.source =
                            templateKey.source + key.source.charAt(0).toUpperCase() + key.source.substring(1);
                        bindings.push.apply(bindings, tslib_1.__spreadArray([], tslib_1.__read(this.parseDirectiveKeywordBindings(key))));
                    }
                }
                this.consumeStatementTerminator();
            }
            return new TemplateBindingParseResult(bindings, [] /* warnings */, this.errors);
        };
        _ParseAST.prototype.parseKeyedReadOrWrite = function (receiver, start, isSafe) {
            var _this = this;
            return this.withContext(ParseContextFlags.Writable, function () {
                _this.rbracketsExpected++;
                var key = _this.parsePipe();
                if (key instanceof ast_1.EmptyExpr) {
                    _this.error("Key access cannot be empty");
                }
                _this.rbracketsExpected--;
                _this.expectCharacter(chars.$RBRACKET);
                if (_this.consumeOptionalOperator('=')) {
                    if (isSafe) {
                        _this.error('The \'?.\' operator cannot be used in the assignment');
                    }
                    else {
                        var value = _this.parseConditional();
                        return new ast_1.KeyedWrite(_this.span(start), _this.sourceSpan(start), receiver, key, value);
                    }
                }
                else {
                    return isSafe ? new ast_1.SafeKeyedRead(_this.span(start), _this.sourceSpan(start), receiver, key) :
                        new ast_1.KeyedRead(_this.span(start), _this.sourceSpan(start), receiver, key);
                }
                return new ast_1.EmptyExpr(_this.span(start), _this.sourceSpan(start));
            });
        };
        /**
         * Parse a directive keyword, followed by a mandatory expression.
         * For example, "of items", "trackBy: func".
         * The bindings are: ngForOf -> items, ngForTrackBy -> func
         * There could be an optional "as" binding that follows the expression.
         * For example,
         * ```
         *   *ngFor="let item of items | slice:0:1 as collection".
         *                    ^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^
         *               keyword    bound target   optional 'as' binding
         * ```
         *
         * @param key binding key, for example, ngFor, ngIf, ngForOf, along with its
         * absolute span.
         */
        _ParseAST.prototype.parseDirectiveKeywordBindings = function (key) {
            var bindings = [];
            this.consumeOptionalCharacter(chars.$COLON); // trackBy: trackByFunction
            var value = this.getDirectiveBoundTarget();
            var spanEnd = this.currentAbsoluteOffset;
            // The binding could optionally be followed by "as". For example,
            // *ngIf="cond | pipe as x". In this case, the key in the "as" binding
            // is "x" and the value is the template key itself ("ngIf"). Note that the
            // 'key' in the current context now becomes the "value" in the next binding.
            var asBinding = this.parseAsBinding(key);
            if (!asBinding) {
                this.consumeStatementTerminator();
                spanEnd = this.currentAbsoluteOffset;
            }
            var sourceSpan = new ast_1.AbsoluteSourceSpan(key.span.start, spanEnd);
            bindings.push(new ast_1.ExpressionBinding(sourceSpan, key, value));
            if (asBinding) {
                bindings.push(asBinding);
            }
            return bindings;
        };
        /**
         * Return the expression AST for the bound target of a directive keyword
         * binding. For example,
         * ```
         *   *ngIf="condition | pipe"
         *          ^^^^^^^^^^^^^^^^ bound target for "ngIf"
         *   *ngFor="let item of items"
         *                       ^^^^^ bound target for "ngForOf"
         * ```
         */
        _ParseAST.prototype.getDirectiveBoundTarget = function () {
            if (this.next === lexer_1.EOF || this.peekKeywordAs() || this.peekKeywordLet()) {
                return null;
            }
            var ast = this.parsePipe(); // example: "condition | async"
            var _a = ast.span, start = _a.start, end = _a.end;
            var value = this.input.substring(start, end);
            return new ast_1.ASTWithSource(ast, value, this.location, this.absoluteOffset + start, this.errors);
        };
        /**
         * Return the binding for a variable declared using `as`. Note that the order
         * of the key-value pair in this declaration is reversed. For example,
         * ```
         *   *ngFor="let item of items; index as i"
         *                              ^^^^^    ^
         *                              value    key
         * ```
         *
         * @param value name of the value in the declaration, "ngIf" in the example
         * above, along with its absolute span.
         */
        _ParseAST.prototype.parseAsBinding = function (value) {
            if (!this.peekKeywordAs()) {
                return null;
            }
            this.advance(); // consume the 'as' keyword
            var key = this.expectTemplateBindingKey();
            this.consumeStatementTerminator();
            var sourceSpan = new ast_1.AbsoluteSourceSpan(value.span.start, this.currentAbsoluteOffset);
            return new ast_1.VariableBinding(sourceSpan, key, value);
        };
        /**
         * Return the binding for a variable declared using `let`. For example,
         * ```
         *   *ngFor="let item of items; let i=index;"
         *           ^^^^^^^^           ^^^^^^^^^^^
         * ```
         * In the first binding, `item` is bound to `NgForOfContext.$implicit`.
         * In the second binding, `i` is bound to `NgForOfContext.index`.
         */
        _ParseAST.prototype.parseLetBinding = function () {
            if (!this.peekKeywordLet()) {
                return null;
            }
            var spanStart = this.currentAbsoluteOffset;
            this.advance(); // consume the 'let' keyword
            var key = this.expectTemplateBindingKey();
            var value = null;
            if (this.consumeOptionalOperator('=')) {
                value = this.expectTemplateBindingKey();
            }
            this.consumeStatementTerminator();
            var sourceSpan = new ast_1.AbsoluteSourceSpan(spanStart, this.currentAbsoluteOffset);
            return new ast_1.VariableBinding(sourceSpan, key, value);
        };
        /**
         * Consume the optional statement terminator: semicolon or comma.
         */
        _ParseAST.prototype.consumeStatementTerminator = function () {
            this.consumeOptionalCharacter(chars.$SEMICOLON) || this.consumeOptionalCharacter(chars.$COMMA);
        };
        /**
         * Records an error and skips over the token stream until reaching a recoverable point. See
         * `this.skip` for more details on token skipping.
         */
        _ParseAST.prototype.error = function (message, index) {
            if (index === void 0) { index = null; }
            this.errors.push(new ast_1.ParserError(message, this.input, this.locationText(index), this.location));
            this.skip();
        };
        _ParseAST.prototype.locationText = function (index) {
            if (index === void 0) { index = null; }
            if (index == null)
                index = this.index;
            return (index < this.tokens.length) ? "at column " + (this.tokens[index].index + 1) + " in" :
                "at the end of the expression";
        };
        /**
         * Records an error for an unexpected private identifier being discovered.
         * @param token Token representing a private identifier.
         * @param extraMessage Optional additional message being appended to the error.
         */
        _ParseAST.prototype._reportErrorForPrivateIdentifier = function (token, extraMessage) {
            var errorMessage = "Private identifiers are not supported. Unexpected private identifier: " + token;
            if (extraMessage !== null) {
                errorMessage += ", " + extraMessage;
            }
            this.error(errorMessage);
        };
        /**
         * Error recovery should skip tokens until it encounters a recovery point.
         *
         * The following are treated as unconditional recovery points:
         *   - end of input
         *   - ';' (parseChain() is always the root production, and it expects a ';')
         *   - '|' (since pipes may be chained and each pipe expression may be treated independently)
         *
         * The following are conditional recovery points:
         *   - ')', '}', ']' if one of calling productions is expecting one of these symbols
         *     - This allows skip() to recover from errors such as '(a.) + 1' allowing more of the AST to
         *       be retained (it doesn't skip any tokens as the ')' is retained because of the '(' begins
         *       an '(' <expr> ')' production).
         *       The recovery points of grouping symbols must be conditional as they must be skipped if
         *       none of the calling productions are not expecting the closing token else we will never
         *       make progress in the case of an extraneous group closing symbol (such as a stray ')').
         *       That is, we skip a closing symbol if we are not in a grouping production.
         *   - '=' in a `Writable` context
         *     - In this context, we are able to recover after seeing the `=` operator, which
         *       signals the presence of an independent rvalue expression following the `=` operator.
         *
         * If a production expects one of these token it increments the corresponding nesting count,
         * and then decrements it just prior to checking if the token is in the input.
         */
        _ParseAST.prototype.skip = function () {
            var n = this.next;
            while (this.index < this.tokens.length && !n.isCharacter(chars.$SEMICOLON) &&
                !n.isOperator('|') && (this.rparensExpected <= 0 || !n.isCharacter(chars.$RPAREN)) &&
                (this.rbracesExpected <= 0 || !n.isCharacter(chars.$RBRACE)) &&
                (this.rbracketsExpected <= 0 || !n.isCharacter(chars.$RBRACKET)) &&
                (!(this.context & ParseContextFlags.Writable) || !n.isOperator('='))) {
                if (this.next.isError()) {
                    this.errors.push(new ast_1.ParserError(this.next.toString(), this.input, this.locationText(), this.location));
                }
                this.advance();
                n = this.next;
            }
        };
        return _ParseAST;
    }());
    exports._ParseAST = _ParseAST;
    var SimpleExpressionChecker = /** @class */ (function () {
        function SimpleExpressionChecker() {
            this.errors = [];
        }
        SimpleExpressionChecker.prototype.visitImplicitReceiver = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitThisReceiver = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitInterpolation = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitLiteralPrimitive = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitPropertyRead = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitPropertyWrite = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitSafePropertyRead = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitMethodCall = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitSafeMethodCall = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitFunctionCall = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitLiteralArray = function (ast, context) {
            this.visitAll(ast.expressions, context);
        };
        SimpleExpressionChecker.prototype.visitLiteralMap = function (ast, context) {
            this.visitAll(ast.values, context);
        };
        SimpleExpressionChecker.prototype.visitUnary = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitBinary = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitPrefixNot = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitNonNullAssert = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitConditional = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitPipe = function (ast, context) {
            this.errors.push('pipes');
        };
        SimpleExpressionChecker.prototype.visitKeyedRead = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitKeyedWrite = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitAll = function (asts, context) {
            var _this = this;
            return asts.map(function (node) { return node.visit(_this, context); });
        };
        SimpleExpressionChecker.prototype.visitChain = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitQuote = function (ast, context) { };
        SimpleExpressionChecker.prototype.visitSafeKeyedRead = function (ast, context) { };
        return SimpleExpressionChecker;
    }());
    /**
     * This class implements SimpleExpressionChecker used in View Engine and performs more strict checks
     * to make sure host bindings do not contain pipes. In View Engine, having pipes in host bindings is
     * not supported as well, but in some cases (like `!(value | async)`) the error is not triggered at
     * compile time. In order to preserve View Engine behavior, more strict checks are introduced for
     * Ivy mode only.
     */
    var IvySimpleExpressionChecker = /** @class */ (function (_super) {
        tslib_1.__extends(IvySimpleExpressionChecker, _super);
        function IvySimpleExpressionChecker() {
            var _this = _super !== null && _super.apply(this, arguments) || this;
            _this.errors = [];
            return _this;
        }
        IvySimpleExpressionChecker.prototype.visitPipe = function () {
            this.errors.push('pipes');
        };
        return IvySimpleExpressionChecker;
    }(ast_1.RecursiveAstVisitor));
});
//# 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* @license\n * Copyright Google LLC 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 {DEFAULT_INTERPOLATION_CONFIG, InterpolationConfig} from '../ml_parser/interpolation_config';\n\nimport {AbsoluteSourceSpan, AST, AstVisitor, ASTWithSource, Binary, BindingPipe, Chain, Conditional, EmptyExpr, ExpressionBinding, FunctionCall, ImplicitReceiver, Interpolation, KeyedRead, KeyedWrite, LiteralArray, LiteralMap, LiteralMapKey, LiteralPrimitive, MethodCall, NonNullAssert, ParserError, ParseSpan, PrefixNot, PropertyRead, PropertyWrite, Quote, RecursiveAstVisitor, SafeKeyedRead, SafeMethodCall, SafePropertyRead, TemplateBinding, TemplateBindingIdentifier, ThisReceiver, Unary, VariableBinding} from './ast';\nimport {EOF, isIdentifier, Lexer, Token, TokenType} from './lexer';\n\nexport interface InterpolationPiece {\n  text: string;\n  start: number;\n  end: number;\n}\nexport class SplitInterpolation {\n  constructor(\n      public strings: InterpolationPiece[], public expressions: InterpolationPiece[],\n      public offsets: number[]) {}\n}\n\nexport class TemplateBindingParseResult {\n  constructor(\n      public templateBindings: TemplateBinding[], public warnings: string[],\n      public errors: ParserError[]) {}\n}\n\nexport class Parser {\n  private errors: ParserError[] = [];\n\n  constructor(private _lexer: Lexer) {}\n\n  simpleExpressionChecker = SimpleExpressionChecker;\n\n  parseAction(\n      input: string, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ASTWithSource {\n    this._checkNoInterpolation(input, location, interpolationConfig);\n    const sourceToLex = this._stripComments(input);\n    const tokens = this._lexer.tokenize(this._stripComments(input));\n    const ast = new _ParseAST(\n                    input, location, absoluteOffset, tokens, sourceToLex.length, true, this.errors,\n                    input.length - sourceToLex.length)\n                    .parseChain();\n    return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);\n  }\n\n  parseBinding(\n      input: string, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ASTWithSource {\n    const ast = this._parseBindingAst(input, location, absoluteOffset, interpolationConfig);\n    return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);\n  }\n\n  private checkSimpleExpression(ast: AST): string[] {\n    const checker = new this.simpleExpressionChecker();\n    ast.visit(checker);\n    return checker.errors;\n  }\n\n  parseSimpleBinding(\n      input: string, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ASTWithSource {\n    const ast = this._parseBindingAst(input, location, absoluteOffset, interpolationConfig);\n    const errors = this.checkSimpleExpression(ast);\n    if (errors.length > 0) {\n      this._reportError(\n          `Host binding expression cannot contain ${errors.join(' ')}`, input, location);\n    }\n    return new ASTWithSource(ast, input, location, absoluteOffset, this.errors);\n  }\n\n  private _reportError(message: string, input: string, errLocation: string, ctxLocation?: string) {\n    this.errors.push(new ParserError(message, input, errLocation, ctxLocation));\n  }\n\n  private _parseBindingAst(\n      input: string, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig): AST {\n    // Quotes expressions use 3rd-party expression language. We don't want to use\n    // our lexer or parser for that, so we check for that ahead of time.\n    const quote = this._parseQuote(input, location, absoluteOffset);\n\n    if (quote != null) {\n      return quote;\n    }\n\n    this._checkNoInterpolation(input, location, interpolationConfig);\n    const sourceToLex = this._stripComments(input);\n    const tokens = this._lexer.tokenize(sourceToLex);\n    return new _ParseAST(\n               input, location, absoluteOffset, tokens, sourceToLex.length, false, this.errors,\n               input.length - sourceToLex.length)\n        .parseChain();\n  }\n\n  private _parseQuote(input: string|null, location: string, absoluteOffset: number): AST|null {\n    if (input == null) return null;\n    const prefixSeparatorIndex = input.indexOf(':');\n    if (prefixSeparatorIndex == -1) return null;\n    const prefix = input.substring(0, prefixSeparatorIndex).trim();\n    if (!isIdentifier(prefix)) return null;\n    const uninterpretedExpression = input.substring(prefixSeparatorIndex + 1);\n    const span = new ParseSpan(0, input.length);\n    return new Quote(\n        span, span.toAbsolute(absoluteOffset), prefix, uninterpretedExpression, location);\n  }\n\n  /**\n   * Parse microsyntax template expression and return a list of bindings or\n   * parsing errors in case the given expression is invalid.\n   *\n   * For example,\n   * ```\n   *   <div *ngFor=\"let item of items\">\n   *         ^      ^ absoluteValueOffset for `templateValue`\n   *         absoluteKeyOffset for `templateKey`\n   * ```\n   * contains three bindings:\n   * 1. ngFor -> null\n   * 2. item -> NgForOfContext.$implicit\n   * 3. ngForOf -> items\n   *\n   * This is apparent from the de-sugared template:\n   * ```\n   *   <ng-template ngFor let-item [ngForOf]=\"items\">\n   * ```\n   *\n   * @param templateKey name of directive, without the * prefix. For example: ngIf, ngFor\n   * @param templateValue RHS of the microsyntax attribute\n   * @param templateUrl template filename if it's external, component filename if it's inline\n   * @param absoluteKeyOffset start of the `templateKey`\n   * @param absoluteValueOffset start of the `templateValue`\n   */\n  parseTemplateBindings(\n      templateKey: string, templateValue: string, templateUrl: string, absoluteKeyOffset: number,\n      absoluteValueOffset: number): TemplateBindingParseResult {\n    const tokens = this._lexer.tokenize(templateValue);\n    const parser = new _ParseAST(\n        templateValue, templateUrl, absoluteValueOffset, tokens, templateValue.length,\n        false /* parseAction */, this.errors, 0 /* relative offset */);\n    return parser.parseTemplateBindings({\n      source: templateKey,\n      span: new AbsoluteSourceSpan(absoluteKeyOffset, absoluteKeyOffset + templateKey.length),\n    });\n  }\n\n  parseInterpolation(\n      input: string, location: string, absoluteOffset: number,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): ASTWithSource|null {\n    const {strings, expressions, offsets} =\n        this.splitInterpolation(input, location, interpolationConfig);\n    if (expressions.length === 0) return null;\n\n    const expressionNodes: AST[] = [];\n\n    for (let i = 0; i < expressions.length; ++i) {\n      const expressionText = expressions[i].text;\n      const sourceToLex = this._stripComments(expressionText);\n      const tokens = this._lexer.tokenize(sourceToLex);\n      const ast = new _ParseAST(\n                      input, location, absoluteOffset, tokens, sourceToLex.length, false,\n                      this.errors, offsets[i] + (expressionText.length - sourceToLex.length))\n                      .parseChain();\n      expressionNodes.push(ast);\n    }\n\n    return this.createInterpolationAst(\n        strings.map(s => s.text), expressionNodes, input, location, absoluteOffset);\n  }\n\n  /**\n   * Similar to `parseInterpolation`, but treats the provided string as a single expression\n   * element that would normally appear within the interpolation prefix and suffix (`{{` and `}}`).\n   * This is used for parsing the switch expression in ICUs.\n   */\n  parseInterpolationExpression(expression: string, location: string, absoluteOffset: number):\n      ASTWithSource {\n    const sourceToLex = this._stripComments(expression);\n    const tokens = this._lexer.tokenize(sourceToLex);\n    const ast = new _ParseAST(\n                    expression, location, absoluteOffset, tokens, sourceToLex.length,\n                    /* parseAction */ false, this.errors, 0)\n                    .parseChain();\n    const strings = ['', ''];  // The prefix and suffix strings are both empty\n    return this.createInterpolationAst(strings, [ast], expression, location, absoluteOffset);\n  }\n\n  private createInterpolationAst(\n      strings: string[], expressions: AST[], input: string, location: string,\n      absoluteOffset: number): ASTWithSource {\n    const span = new ParseSpan(0, input.length);\n    const interpolation =\n        new Interpolation(span, span.toAbsolute(absoluteOffset), strings, expressions);\n    return new ASTWithSource(interpolation, input, location, absoluteOffset, this.errors);\n  }\n\n  /**\n   * Splits a string of text into \"raw\" text segments and expressions present in interpolations in\n   * the string.\n   * Returns `null` if there are no interpolations, otherwise a\n   * `SplitInterpolation` with splits that look like\n   *   <raw text> <expression> <raw text> ... <raw text> <expression> <raw text>\n   */\n  splitInterpolation(\n      input: string, location: string,\n      interpolationConfig: InterpolationConfig = DEFAULT_INTERPOLATION_CONFIG): SplitInterpolation {\n    const strings: InterpolationPiece[] = [];\n    const expressions: InterpolationPiece[] = [];\n    const offsets: number[] = [];\n    let i = 0;\n    let atInterpolation = false;\n    let extendLastString = false;\n    let {start: interpStart, end: interpEnd} = interpolationConfig;\n    while (i < input.length) {\n      if (!atInterpolation) {\n        // parse until starting {{\n        const start = i;\n        i = input.indexOf(interpStart, i);\n        if (i === -1) {\n          i = input.length;\n        }\n        const text = input.substring(start, i);\n        strings.push({text, start, end: i});\n\n        atInterpolation = true;\n      } else {\n        // parse from starting {{ to ending }} while ignoring content inside quotes.\n        const fullStart = i;\n        const exprStart = fullStart + interpStart.length;\n        const exprEnd = this._getInterpolationEndIndex(input, interpEnd, exprStart);\n        if (exprEnd === -1) {\n          // Could not find the end of the interpolation; do not parse an expression.\n          // Instead we should extend the content on the last raw string.\n          atInterpolation = false;\n          extendLastString = true;\n          break;\n        }\n        const fullEnd = exprEnd + interpEnd.length;\n\n        const text = input.substring(exprStart, exprEnd);\n        if (text.trim().length === 0) {\n          this._reportError(\n              'Blank expressions are not allowed in interpolated strings', input,\n              `at column ${i} in`, location);\n        }\n        expressions.push({text, start: fullStart, end: fullEnd});\n        offsets.push(exprStart);\n\n        i = fullEnd;\n        atInterpolation = false;\n      }\n    }\n    if (!atInterpolation) {\n      // If we are now at a text section, add the remaining content as a raw string.\n      if (extendLastString) {\n        const piece = strings[strings.length - 1];\n        piece.text += input.substring(i);\n        piece.end = input.length;\n      } else {\n        strings.push({text: input.substring(i), start: i, end: input.length});\n      }\n    }\n    return new SplitInterpolation(strings, expressions, offsets);\n  }\n\n  wrapLiteralPrimitive(input: string|null, location: string, absoluteOffset: number):\n      ASTWithSource {\n    const span = new ParseSpan(0, input == null ? 0 : input.length);\n    return new ASTWithSource(\n        new LiteralPrimitive(span, span.toAbsolute(absoluteOffset), input), input, location,\n        absoluteOffset, this.errors);\n  }\n\n  private _stripComments(input: string): string {\n    const i = this._commentStart(input);\n    return i != null ? input.substring(0, i).trim() : input;\n  }\n\n  private _commentStart(input: string): number|null {\n    let outerQuote: number|null = null;\n    for (let i = 0; i < input.length - 1; i++) {\n      const char = input.charCodeAt(i);\n      const nextChar = input.charCodeAt(i + 1);\n\n      if (char === chars.$SLASH && nextChar == chars.$SLASH && outerQuote == null) return i;\n\n      if (outerQuote === char) {\n        outerQuote = null;\n      } else if (outerQuote == null && chars.isQuote(char)) {\n        outerQuote = char;\n      }\n    }\n    return null;\n  }\n\n  private _checkNoInterpolation(input: string, location: string, {start, end}: InterpolationConfig):\n      void {\n    let startIndex = -1;\n    let endIndex = -1;\n\n    for (const charIndex of this._forEachUnquotedChar(input, 0)) {\n      if (startIndex === -1) {\n        if (input.startsWith(start)) {\n          startIndex = charIndex;\n        }\n      } else {\n        endIndex = this._getInterpolationEndIndex(input, end, charIndex);\n        if (endIndex > -1) {\n          break;\n        }\n      }\n    }\n\n    if (startIndex > -1 && endIndex > -1) {\n      this._reportError(\n          `Got interpolation (${start}${end}) where expression was expected`, input,\n          `at column ${startIndex} in`, location);\n    }\n  }\n\n  /**\n   * Finds the index of the end of an interpolation expression\n   * while ignoring comments and quoted content.\n   */\n  private _getInterpolationEndIndex(input: string, expressionEnd: string, start: number): number {\n    for (const charIndex of this._forEachUnquotedChar(input, start)) {\n      if (input.startsWith(expressionEnd, charIndex)) {\n        return charIndex;\n      }\n\n      // Nothing else in the expression matters after we've\n      // hit a comment so look directly for the end token.\n      if (input.startsWith('//', charIndex)) {\n        return input.indexOf(expressionEnd, charIndex);\n      }\n    }\n\n    return -1;\n  }\n\n  /**\n   * Generator used to iterate over the character indexes of a string that are outside of quotes.\n   * @param input String to loop through.\n   * @param start Index within the string at which to start.\n   */\n  private * _forEachUnquotedChar(input: string, start: number) {\n    let currentQuote: string|null = null;\n    let escapeCount = 0;\n    for (let i = start; i < input.length; i++) {\n      const char = input[i];\n      // Skip the characters inside quotes. Note that we only care about the outer-most\n      // quotes matching up and we need to account for escape characters.\n      if (chars.isQuote(input.charCodeAt(i)) && (currentQuote === null || currentQuote === char) &&\n          escapeCount % 2 === 0) {\n        currentQuote = currentQuote === null ? char : null;\n      } else if (currentQuote === null) {\n        yield i;\n      }\n      escapeCount = char === '\\\\' ? escapeCount + 1 : 0;\n    }\n  }\n}\n\nexport class IvyParser extends Parser {\n  override simpleExpressionChecker = IvySimpleExpressionChecker;\n}\n\n/** Describes a stateful context an expression parser is in. */\nenum ParseContextFlags {\n  None = 0,\n  /**\n   * A Writable context is one in which a value may be written to an lvalue.\n   * For example, after we see a property access, we may expect a write to the\n   * property via the \"=\" operator.\n   *   prop\n   *        ^ possible \"=\" after\n   */\n  Writable = 1,\n}\n\nexport class _ParseAST {\n  private rparensExpected = 0;\n  private rbracketsExpected = 0;\n  private rbracesExpected = 0;\n  private context = ParseContextFlags.None;\n\n  // Cache of expression start and input indeces to the absolute source span they map to, used to\n  // prevent creating superfluous source spans in `sourceSpan`.\n  // A serial of the expression start and input index is used for mapping because both are stateful\n  // and may change for subsequent expressions visited by the parser.\n  private sourceSpanCache = new Map<string, AbsoluteSourceSpan>();\n\n  index: number = 0;\n\n  constructor(\n      public input: string, public location: string, public absoluteOffset: number,\n      public tokens: Token[], public inputLength: number, public parseAction: boolean,\n      private errors: ParserError[], private offset: number) {}\n\n  peek(offset: number): Token {\n    const i = this.index + offset;\n    return i < this.tokens.length ? this.tokens[i] : EOF;\n  }\n\n  get next(): Token {\n    return this.peek(0);\n  }\n\n  /** Whether all the parser input has been processed. */\n  get atEOF(): boolean {\n    return this.index >= this.tokens.length;\n  }\n\n  /**\n   * Index of the next token to be processed, or the end of the last token if all have been\n   * processed.\n   */\n  get inputIndex(): number {\n    return this.atEOF ? this.currentEndIndex : this.next.index + this.offset;\n  }\n\n  /**\n   * End index of the last processed token, or the start of the first token if none have been\n   * processed.\n   */\n  get currentEndIndex(): number {\n    if (this.index > 0) {\n      const curToken = this.peek(-1);\n      return curToken.end + this.offset;\n    }\n    // No tokens have been processed yet; return the next token's start or the length of the input\n    // if there is no token.\n    if (this.tokens.length === 0) {\n      return this.inputLength + this.offset;\n    }\n    return this.next.index + this.offset;\n  }\n\n  /**\n   * Returns the absolute offset of the start of the current token.\n   */\n  get currentAbsoluteOffset(): number {\n    return this.absoluteOffset + this.inputIndex;\n  }\n\n  /**\n   * Retrieve a `ParseSpan` from `start` to the current position (or to `artificialEndIndex` if\n   * provided).\n   *\n   * @param start Position from which the `ParseSpan` will start.\n   * @param artificialEndIndex Optional ending index to be used if provided (and if greater than the\n   *     natural ending index)\n   */\n  span(start: number, artificialEndIndex?: number): ParseSpan {\n    let endIndex = this.currentEndIndex;\n    if (artificialEndIndex !== undefined && artificialEndIndex > this.currentEndIndex) {\n      endIndex = artificialEndIndex;\n    }\n\n    // In some unusual parsing scenarios (like when certain tokens are missing and an `EmptyExpr` is\n    // being created), the current token may already be advanced beyond the `currentEndIndex`. This\n    // appears to be a deep-seated parser bug.\n    //\n    // As a workaround for now, swap the start and end indices to ensure a valid `ParseSpan`.\n    // TODO(alxhub): fix the bug upstream in the parser state, and remove this workaround.\n    if (start > endIndex) {\n      const tmp = endIndex;\n      endIndex = start;\n      start = tmp;\n    }\n\n    return new ParseSpan(start, endIndex);\n  }\n\n  sourceSpan(start: number, artificialEndIndex?: number): AbsoluteSourceSpan {\n    const serial = `${start}@${this.inputIndex}:${artificialEndIndex}`;\n    if (!this.sourceSpanCache.has(serial)) {\n      this.sourceSpanCache.set(\n          serial, this.span(start, artificialEndIndex).toAbsolute(this.absoluteOffset));\n    }\n    return this.sourceSpanCache.get(serial)!;\n  }\n\n  advance() {\n    this.index++;\n  }\n\n  /**\n   * Executes a callback in the provided context.\n   */\n  private withContext<T>(context: ParseContextFlags, cb: () => T): T {\n    this.context |= context;\n    const ret = cb();\n    this.context ^= context;\n    return ret;\n  }\n\n  consumeOptionalCharacter(code: number): boolean {\n    if (this.next.isCharacter(code)) {\n      this.advance();\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  peekKeywordLet(): boolean {\n    return this.next.isKeywordLet();\n  }\n  peekKeywordAs(): boolean {\n    return this.next.isKeywordAs();\n  }\n\n  /**\n   * Consumes an expected character, otherwise emits an error about the missing expected character\n   * and skips over the token stream until reaching a recoverable point.\n   *\n   * See `this.error` and `this.skip` for more details.\n   */\n  expectCharacter(code: number) {\n    if (this.consumeOptionalCharacter(code)) return;\n    this.error(`Missing expected ${String.fromCharCode(code)}`);\n  }\n\n  consumeOptionalOperator(op: string): boolean {\n    if (this.next.isOperator(op)) {\n      this.advance();\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  expectOperator(operator: string) {\n    if (this.consumeOptionalOperator(operator)) return;\n    this.error(`Missing expected operator ${operator}`);\n  }\n\n  prettyPrintToken(tok: Token): string {\n    return tok === EOF ? 'end of input' : `token ${tok}`;\n  }\n\n  expectIdentifierOrKeyword(): string|null {\n    const n = this.next;\n    if (!n.isIdentifier() && !n.isKeyword()) {\n      if (n.isPrivateIdentifier()) {\n        this._reportErrorForPrivateIdentifier(n, 'expected identifier or keyword');\n      } else {\n        this.error(`Unexpected ${this.prettyPrintToken(n)}, expected identifier or keyword`);\n      }\n      return null;\n    }\n    this.advance();\n    return n.toString() as string;\n  }\n\n  expectIdentifierOrKeywordOrString(): string {\n    const n = this.next;\n    if (!n.isIdentifier() && !n.isKeyword() && !n.isString()) {\n      if (n.isPrivateIdentifier()) {\n        this._reportErrorForPrivateIdentifier(n, 'expected identifier, keyword or string');\n      } else {\n        this.error(\n            `Unexpected ${this.prettyPrintToken(n)}, expected identifier, keyword, or string`);\n      }\n      return '';\n    }\n    this.advance();\n    return n.toString() as string;\n  }\n\n  parseChain(): AST {\n    const exprs: AST[] = [];\n    const start = this.inputIndex;\n    while (this.index < this.tokens.length) {\n      const expr = this.parsePipe();\n      exprs.push(expr);\n\n      if (this.consumeOptionalCharacter(chars.$SEMICOLON)) {\n        if (!this.parseAction) {\n          this.error('Binding expression cannot contain chained expression');\n        }\n        while (this.consumeOptionalCharacter(chars.$SEMICOLON)) {\n        }  // read all semicolons\n      } else if (this.index < this.tokens.length) {\n        this.error(`Unexpected token '${this.next}'`);\n      }\n    }\n    if (exprs.length == 0) {\n      // We have no expressions so create an empty expression that spans the entire input length\n      const artificialStart = this.offset;\n      const artificialEnd = this.offset + this.inputLength;\n      return new EmptyExpr(\n          this.span(artificialStart, artificialEnd),\n          this.sourceSpan(artificialStart, artificialEnd));\n    }\n    if (exprs.length == 1) return exprs[0];\n    return new Chain(this.span(start), this.sourceSpan(start), exprs);\n  }\n\n  parsePipe(): AST {\n    const start = this.inputIndex;\n    let result = this.parseExpression();\n    if (this.consumeOptionalOperator('|')) {\n      if (this.parseAction) {\n        this.error('Cannot have a pipe in an action expression');\n      }\n\n      do {\n        const nameStart = this.inputIndex;\n        let nameId = this.expectIdentifierOrKeyword();\n        let nameSpan: AbsoluteSourceSpan;\n        let fullSpanEnd: number|undefined = undefined;\n        if (nameId !== null) {\n          nameSpan = this.sourceSpan(nameStart);\n        } else {\n          // No valid identifier was found, so we'll assume an empty pipe name ('').\n          nameId = '';\n\n          // However, there may have been whitespace present between the pipe character and the next\n          // token in the sequence (or the end of input). We want to track this whitespace so that\n          // the `BindingPipe` we produce covers not just the pipe character, but any trailing\n          // whitespace beyond it. Another way of thinking about this is that the zero-length name\n          // is assumed to be at the end of any whitespace beyond the pipe character.\n          //\n          // Therefore, we push the end of the `ParseSpan` for this pipe all the way up to the\n          // beginning of the next token, or until the end of input if the next token is EOF.\n          fullSpanEnd = this.next.index !== -1 ? this.next.index : this.inputLength + this.offset;\n\n          // The `nameSpan` for an empty pipe name is zero-length at the end of any whitespace\n          // beyond the pipe character.\n          nameSpan = new ParseSpan(fullSpanEnd, fullSpanEnd).toAbsolute(this.absoluteOffset);\n        }\n\n        const args: AST[] = [];\n        while (this.consumeOptionalCharacter(chars.$COLON)) {\n          args.push(this.parseExpression());\n\n          // If there are additional expressions beyond the name, then the artificial end for the\n          // name is no longer relevant.\n        }\n        result = new BindingPipe(\n            this.span(start), this.sourceSpan(start, fullSpanEnd), result, nameId, args, nameSpan);\n      } while (this.consumeOptionalOperator('|'));\n    }\n\n    return result;\n  }\n\n  parseExpression(): AST {\n    return this.parseConditional();\n  }\n\n  parseConditional(): AST {\n    const start = this.inputIndex;\n    const result = this.parseLogicalOr();\n\n    if (this.consumeOptionalOperator('?')) {\n      const yes = this.parsePipe();\n      let no: AST;\n      if (!this.consumeOptionalCharacter(chars.$COLON)) {\n        const end = this.inputIndex;\n        const expression = this.input.substring(start, end);\n        this.error(`Conditional expression ${expression} requires all 3 expressions`);\n        no = new EmptyExpr(this.span(start), this.sourceSpan(start));\n      } else {\n        no = this.parsePipe();\n      }\n      return new Conditional(this.span(start), this.sourceSpan(start), result, yes, no);\n    } else {\n      return result;\n    }\n  }\n\n  parseLogicalOr(): AST {\n    // '||'\n    const start = this.inputIndex;\n    let result = this.parseLogicalAnd();\n    while (this.consumeOptionalOperator('||')) {\n      const right = this.parseLogicalAnd();\n      result = new Binary(this.span(start), this.sourceSpan(start), '||', result, right);\n    }\n    return result;\n  }\n\n  parseLogicalAnd(): AST {\n    // '&&'\n    const start = this.inputIndex;\n    let result = this.parseNullishCoalescing();\n    while (this.consumeOptionalOperator('&&')) {\n      const right = this.parseNullishCoalescing();\n      result = new Binary(this.span(start), this.sourceSpan(start), '&&', result, right);\n    }\n    return result;\n  }\n\n  parseNullishCoalescing(): AST {\n    // '??'\n    const start = this.inputIndex;\n    let result = this.parseEquality();\n    while (this.consumeOptionalOperator('??')) {\n      const right = this.parseEquality();\n      result = new Binary(this.span(start), this.sourceSpan(start), '??', result, right);\n    }\n    return result;\n  }\n\n  parseEquality(): AST {\n    // '==','!=','===','!=='\n    const start = this.inputIndex;\n    let result = this.parseRelational();\n    while (this.next.type == TokenType.Operator) {\n      const operator = this.next.strValue;\n      switch (operator) {\n        case '==':\n        case '===':\n        case '!=':\n        case '!==':\n          this.advance();\n          const right = this.parseRelational();\n          result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);\n          continue;\n      }\n      break;\n    }\n    return result;\n  }\n\n  parseRelational(): AST {\n    // '<', '>', '<=', '>='\n    const start = this.inputIndex;\n    let result = this.parseAdditive();\n    while (this.next.type == TokenType.Operator) {\n      const operator = this.next.strValue;\n      switch (operator) {\n        case '<':\n        case '>':\n        case '<=':\n        case '>=':\n          this.advance();\n          const right = this.parseAdditive();\n          result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);\n          continue;\n      }\n      break;\n    }\n    return result;\n  }\n\n  parseAdditive(): AST {\n    // '+', '-'\n    const start = this.inputIndex;\n    let result = this.parseMultiplicative();\n    while (this.next.type == TokenType.Operator) {\n      const operator = this.next.strValue;\n      switch (operator) {\n        case '+':\n        case '-':\n          this.advance();\n          let right = this.parseMultiplicative();\n          result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);\n          continue;\n      }\n      break;\n    }\n    return result;\n  }\n\n  parseMultiplicative(): AST {\n    // '*', '%', '/'\n    const start = this.inputIndex;\n    let result = this.parsePrefix();\n    while (this.next.type == TokenType.Operator) {\n      const operator = this.next.strValue;\n      switch (operator) {\n        case '*':\n        case '%':\n        case '/':\n          this.advance();\n          let right = this.parsePrefix();\n          result = new Binary(this.span(start), this.sourceSpan(start), operator, result, right);\n          continue;\n      }\n      break;\n    }\n    return result;\n  }\n\n  parsePrefix(): AST {\n    if (this.next.type == TokenType.Operator) {\n      const start = this.inputIndex;\n      const operator = this.next.strValue;\n      let result: AST;\n      switch (operator) {\n        case '+':\n          this.advance();\n          result = this.parsePrefix();\n          return Unary.createPlus(this.span(start), this.sourceSpan(start), result);\n        case '-':\n          this.advance();\n          result = this.parsePrefix();\n          return Unary.createMinus(this.span(start), this.sourceSpan(start), result);\n        case '!':\n          this.advance();\n          result = this.parsePrefix();\n          return new PrefixNot(this.span(start), this.sourceSpan(start), result);\n      }\n    }\n    return this.parseCallChain();\n  }\n\n  parseCallChain(): AST {\n    const start = this.inputIndex;\n    let result = this.parsePrimary();\n    while (true) {\n      if (this.consumeOptionalCharacter(chars.$PERIOD)) {\n        result = this.parseAccessMemberOrMethodCall(result, start, false);\n\n      } else if (this.consumeOptionalOperator('?.')) {\n        result = this.consumeOptionalCharacter(chars.$LBRACKET) ?\n            this.parseKeyedReadOrWrite(result, start, true) :\n            this.parseAccessMemberOrMethodCall(result, start, true);\n      } else if (this.consumeOptionalCharacter(chars.$LBRACKET)) {\n        result = this.parseKeyedReadOrWrite(result, start, false);\n      } else if (this.consumeOptionalCharacter(chars.$LPAREN)) {\n        this.rparensExpected++;\n        const args = this.parseCallArguments();\n        this.rparensExpected--;\n        this.expectCharacter(chars.$RPAREN);\n        result = new FunctionCall(this.span(start), this.sourceSpan(start), result, args);\n\n      } else if (this.consumeOptionalOperator('!')) {\n        result = new NonNullAssert(this.span(start), this.sourceSpan(start), result);\n\n      } else {\n        return result;\n      }\n    }\n  }\n\n  parsePrimary(): AST {\n    const start = this.inputIndex;\n    if (this.consumeOptionalCharacter(chars.$LPAREN)) {\n      this.rparensExpected++;\n      const result = this.parsePipe();\n      this.rparensExpected--;\n      this.expectCharacter(chars.$RPAREN);\n      return result;\n\n    } else if (this.next.isKeywordNull()) {\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), null);\n\n    } else if (this.next.isKeywordUndefined()) {\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), void 0);\n\n    } else if (this.next.isKeywordTrue()) {\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), true);\n\n    } else if (this.next.isKeywordFalse()) {\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), false);\n\n    } else if (this.next.isKeywordThis()) {\n      this.advance();\n      return new ThisReceiver(this.span(start), this.sourceSpan(start));\n    } else if (this.consumeOptionalCharacter(chars.$LBRACKET)) {\n      this.rbracketsExpected++;\n      const elements = this.parseExpressionList(chars.$RBRACKET);\n      this.rbracketsExpected--;\n      this.expectCharacter(chars.$RBRACKET);\n      return new LiteralArray(this.span(start), this.sourceSpan(start), elements);\n\n    } else if (this.next.isCharacter(chars.$LBRACE)) {\n      return this.parseLiteralMap();\n\n    } else if (this.next.isIdentifier()) {\n      return this.parseAccessMemberOrMethodCall(\n          new ImplicitReceiver(this.span(start), this.sourceSpan(start)), start, false);\n\n    } else if (this.next.isNumber()) {\n      const value = this.next.toNumber();\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), value);\n\n    } else if (this.next.isString()) {\n      const literalValue = this.next.toString();\n      this.advance();\n      return new LiteralPrimitive(this.span(start), this.sourceSpan(start), literalValue);\n\n    } else if (this.next.isPrivateIdentifier()) {\n      this._reportErrorForPrivateIdentifier(this.next, null);\n      return new EmptyExpr(this.span(start), this.sourceSpan(start));\n\n    } else if (this.index >= this.tokens.length) {\n      this.error(`Unexpected end of expression: ${this.input}`);\n      return new EmptyExpr(this.span(start), this.sourceSpan(start));\n    } else {\n      this.error(`Unexpected token ${this.next}`);\n      return new EmptyExpr(this.span(start), this.sourceSpan(start));\n    }\n  }\n\n  parseExpressionList(terminator: number): AST[] {\n    const result: AST[] = [];\n\n    do {\n      if (!this.next.isCharacter(terminator)) {\n        result.push(this.parsePipe());\n      } else {\n        break;\n      }\n    } while (this.consumeOptionalCharacter(chars.$COMMA));\n    return result;\n  }\n\n  parseLiteralMap(): LiteralMap {\n    const keys: LiteralMapKey[] = [];\n    const values: AST[] = [];\n    const start = this.inputIndex;\n    this.expectCharacter(chars.$LBRACE);\n    if (!this.consumeOptionalCharacter(chars.$RBRACE)) {\n      this.rbracesExpected++;\n      do {\n        const keyStart = this.inputIndex;\n        const quoted = this.next.isString();\n        const key = this.expectIdentifierOrKeywordOrString();\n        keys.push({key, quoted});\n\n        // Properties with quoted keys can't use the shorthand syntax.\n        if (quoted) {\n          this.expectCharacter(chars.$COLON);\n          values.push(this.parsePipe());\n        } else if (this.consumeOptionalCharacter(chars.$COLON)) {\n          values.push(this.parsePipe());\n        } else {\n          const span = this.span(keyStart);\n          const sourceSpan = this.sourceSpan(keyStart);\n          values.push(new PropertyRead(\n              span, sourceSpan, sourceSpan, new ImplicitReceiver(span, sourceSpan), key));\n        }\n      } while (this.consumeOptionalCharacter(chars.$COMMA));\n      this.rbracesExpected--;\n      this.expectCharacter(chars.$RBRACE);\n    }\n    return new LiteralMap(this.span(start), this.sourceSpan(start), keys, values);\n  }\n\n  parseAccessMemberOrMethodCall(receiver: AST, start: number, isSafe: boolean): AST {\n    const nameStart = this.inputIndex;\n    const id = this.withContext(ParseContextFlags.Writable, () => {\n      const id = this.expectIdentifierOrKeyword() ?? '';\n      if (id.length === 0) {\n        this.error(`Expected identifier for property access`, receiver.span.end);\n      }\n      return id;\n    });\n    const nameSpan = this.sourceSpan(nameStart);\n\n    if (this.consumeOptionalCharacter(chars.$LPAREN)) {\n      const argumentStart = this.inputIndex;\n      this.rparensExpected++;\n      const args = this.parseCallArguments();\n      const argumentSpan =\n          this.span(argumentStart, this.inputIndex).toAbsolute(this.absoluteOffset);\n\n      this.expectCharacter(chars.$RPAREN);\n      this.rparensExpected--;\n      const span = this.span(start);\n      const sourceSpan = this.sourceSpan(start);\n      return isSafe ?\n          new SafeMethodCall(span, sourceSpan, nameSpan, receiver, id, args, argumentSpan) :\n          new MethodCall(span, sourceSpan, nameSpan, receiver, id, args, argumentSpan);\n\n    } else {\n      if (isSafe) {\n        if (this.consumeOptionalOperator('=')) {\n          this.error('The \\'?.\\' operator cannot be used in the assignment');\n          return new EmptyExpr(this.span(start), this.sourceSpan(start));\n        } else {\n          return new SafePropertyRead(\n              this.span(start), this.sourceSpan(start), nameSpan, receiver, id);\n        }\n      } else {\n        if (this.consumeOptionalOperator('=')) {\n          if (!this.parseAction) {\n            this.error('Bindings cannot contain assignments');\n            return new EmptyExpr(this.span(start), this.sourceSpan(start));\n          }\n\n          const value = this.parseConditional();\n          return new PropertyWrite(\n              this.span(start), this.sourceSpan(start), nameSpan, receiver, id, value);\n        } else {\n          return new PropertyRead(this.span(start), this.sourceSpan(start), nameSpan, receiver, id);\n        }\n      }\n    }\n  }\n\n  parseCallArguments(): BindingPipe[] {\n    if (this.next.isCharacter(chars.$RPAREN)) return [];\n    const positionals: AST[] = [];\n    do {\n      positionals.push(this.parsePipe());\n    } while (this.consumeOptionalCharacter(chars.$COMMA));\n    return positionals as BindingPipe[];\n  }\n\n  /**\n   * Parses an identifier, a keyword, a string with an optional `-` in between,\n   * and returns the string along with its absolute source span.\n   */\n  expectTemplateBindingKey(): TemplateBindingIdentifier {\n    let result = '';\n    let operatorFound = false;\n    const start = this.currentAbsoluteOffset;\n    do {\n      result += this.expectIdentifierOrKeywordOrString();\n      operatorFound = this.consumeOptionalOperator('-');\n      if (operatorFound) {\n        result += '-';\n      }\n    } while (operatorFound);\n    return {\n      source: result,\n      span: new AbsoluteSourceSpan(start, start + result.length),\n    };\n  }\n\n  /**\n   * Parse microsyntax template expression and return a list of bindings or\n   * parsing errors in case the given expression is invalid.\n   *\n   * For example,\n   * ```\n   *   <div *ngFor=\"let item of items; index as i; trackBy: func\">\n   * ```\n   * contains five bindings:\n   * 1. ngFor -> null\n   * 2. item -> NgForOfContext.$implicit\n   * 3. ngForOf -> items\n   * 4. i -> NgForOfContext.index\n   * 5. ngForTrackBy -> func\n   *\n   * For a full description of the microsyntax grammar, see\n   * https://gist.github.com/mhevery/d3530294cff2e4a1b3fe15ff75d08855\n   *\n   * @param templateKey name of the microsyntax directive, like ngIf, ngFor,\n   * without the *, along with its absolute span.\n   */\n  parseTemplateBindings(templateKey: TemplateBindingIdentifier): TemplateBindingParseResult {\n    const bindings: TemplateBinding[] = [];\n\n    // The first binding is for the template key itself\n    // In *ngFor=\"let item of items\", key = \"ngFor\", value = null\n    // In *ngIf=\"cond | pipe\", key = \"ngIf\", value = \"cond | pipe\"\n    bindings.push(...this.parseDirectiveKeywordBindings(templateKey));\n\n    while (this.index < this.tokens.length) {\n      // If it starts with 'let', then this must be variable declaration\n      const letBinding = this.parseLetBinding();\n      if (letBinding) {\n        bindings.push(letBinding);\n      } else {\n        // Two possible cases here, either `value \"as\" key` or\n        // \"directive-keyword expression\". We don't know which case, but both\n        // \"value\" and \"directive-keyword\" are template binding key, so consume\n        // the key first.\n        const key = this.expectTemplateBindingKey();\n        // Peek at the next token, if it is \"as\" then this must be variable\n        // declaration.\n        const binding = this.parseAsBinding(key);\n        if (binding) {\n          bindings.push(binding);\n        } else {\n          // Otherwise the key must be a directive keyword, like \"of\". Transform\n          // the key to actual key. Eg. of -> ngForOf, trackBy -> ngForTrackBy\n          key.source =\n              templateKey.source + key.source.charAt(0).toUpperCase() + key.source.substring(1);\n          bindings.push(...this.parseDirectiveKeywordBindings(key));\n        }\n      }\n      this.consumeStatementTerminator();\n    }\n\n    return new TemplateBindingParseResult(bindings, [] /* warnings */, this.errors);\n  }\n\n  parseKeyedReadOrWrite(receiver: AST, start: number, isSafe: boolean): AST {\n    return this.withContext(ParseContextFlags.Writable, () => {\n      this.rbracketsExpected++;\n      const key = this.parsePipe();\n      if (key instanceof EmptyExpr) {\n        this.error(`Key access cannot be empty`);\n      }\n      this.rbracketsExpected--;\n      this.expectCharacter(chars.$RBRACKET);\n      if (this.consumeOptionalOperator('=')) {\n        if (isSafe) {\n          this.error('The \\'?.\\' operator cannot be used in the assignment');\n        } else {\n          const value = this.parseConditional();\n          return new KeyedWrite(this.span(start), this.sourceSpan(start), receiver, key, value);\n        }\n      } else {\n        return isSafe ? new SafeKeyedRead(this.span(start), this.sourceSpan(start), receiver, key) :\n                        new KeyedRead(this.span(start), this.sourceSpan(start), receiver, key);\n      }\n\n      return new EmptyExpr(this.span(start), this.sourceSpan(start));\n    });\n  }\n\n  /**\n   * Parse a directive keyword, followed by a mandatory expression.\n   * For example, \"of items\", \"trackBy: func\".\n   * The bindings are: ngForOf -> items, ngForTrackBy -> func\n   * There could be an optional \"as\" binding that follows the expression.\n   * For example,\n   * ```\n   *   *ngFor=\"let item of items | slice:0:1 as collection\".\n   *                    ^^ ^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^\n   *               keyword    bound target   optional 'as' binding\n   * ```\n   *\n   * @param key binding key, for example, ngFor, ngIf, ngForOf, along with its\n   * absolute span.\n   */\n  private parseDirectiveKeywordBindings(key: TemplateBindingIdentifier): TemplateBinding[] {\n    const bindings: TemplateBinding[] = [];\n    this.consumeOptionalCharacter(chars.$COLON);  // trackBy: trackByFunction\n    const value = this.getDirectiveBoundTarget();\n    let spanEnd = this.currentAbsoluteOffset;\n    // The binding could optionally be followed by \"as\". For example,\n    // *ngIf=\"cond | pipe as x\". In this case, the key in the \"as\" binding\n    // is \"x\" and the value is the template key itself (\"ngIf\"). Note that the\n    // 'key' in the current context now becomes the \"value\" in the next binding.\n    const asBinding = this.parseAsBinding(key);\n    if (!asBinding) {\n      this.consumeStatementTerminator();\n      spanEnd = this.currentAbsoluteOffset;\n    }\n    const sourceSpan = new AbsoluteSourceSpan(key.span.start, spanEnd);\n    bindings.push(new ExpressionBinding(sourceSpan, key, value));\n    if (asBinding) {\n      bindings.push(asBinding);\n    }\n    return bindings;\n  }\n\n  /**\n   * Return the expression AST for the bound target of a directive keyword\n   * binding. For example,\n   * ```\n   *   *ngIf=\"condition | pipe\"\n   *          ^^^^^^^^^^^^^^^^ bound target for \"ngIf\"\n   *   *ngFor=\"let item of items\"\n   *                       ^^^^^ bound target for \"ngForOf\"\n   * ```\n   */\n  private getDirectiveBoundTarget(): ASTWithSource|null {\n    if (this.next === EOF || this.peekKeywordAs() || this.peekKeywordLet()) {\n      return null;\n    }\n    const ast = this.parsePipe();  // example: \"condition | async\"\n    const {start, end} = ast.span;\n    const value = this.input.substring(start, end);\n    return new ASTWithSource(ast, value, this.location, this.absoluteOffset + start, this.errors);\n  }\n\n  /**\n   * Return the binding for a variable declared using `as`. Note that the order\n   * of the key-value pair in this declaration is reversed. For example,\n   * ```\n   *   *ngFor=\"let item of items; index as i\"\n   *                              ^^^^^    ^\n   *                              value    key\n   * ```\n   *\n   * @param value name of the value in the declaration, \"ngIf\" in the example\n   * above, along with its absolute span.\n   */\n  private parseAsBinding(value: TemplateBindingIdentifier): TemplateBinding|null {\n    if (!this.peekKeywordAs()) {\n      return null;\n    }\n    this.advance();  // consume the 'as' keyword\n    const key = this.expectTemplateBindingKey();\n    this.consumeStatementTerminator();\n    const sourceSpan = new AbsoluteSourceSpan(value.span.start, this.currentAbsoluteOffset);\n    return new VariableBinding(sourceSpan, key, value);\n  }\n\n  /**\n   * Return the binding for a variable declared using `let`. For example,\n   * ```\n   *   *ngFor=\"let item of items; let i=index;\"\n   *           ^^^^^^^^           ^^^^^^^^^^^\n   * ```\n   * In the first binding, `item` is bound to `NgForOfContext.$implicit`.\n   * In the second binding, `i` is bound to `NgForOfContext.index`.\n   */\n  private parseLetBinding(): TemplateBinding|null {\n    if (!this.peekKeywordLet()) {\n      return null;\n    }\n    const spanStart = this.currentAbsoluteOffset;\n    this.advance();  // consume the 'let' keyword\n    const key = this.expectTemplateBindingKey();\n    let value: TemplateBindingIdentifier|null = null;\n    if (this.consumeOptionalOperator('=')) {\n      value = this.expectTemplateBindingKey();\n    }\n    this.consumeStatementTerminator();\n    const sourceSpan = new AbsoluteSourceSpan(spanStart, this.currentAbsoluteOffset);\n    return new VariableBinding(sourceSpan, key, value);\n  }\n\n  /**\n   * Consume the optional statement terminator: semicolon or comma.\n   */\n  private consumeStatementTerminator() {\n    this.consumeOptionalCharacter(chars.$SEMICOLON) || this.consumeOptionalCharacter(chars.$COMMA);\n  }\n\n  /**\n   * Records an error and skips over the token stream until reaching a recoverable point. See\n   * `this.skip` for more details on token skipping.\n   */\n  error(message: string, index: number|null = null) {\n    this.errors.push(new ParserError(message, this.input, this.locationText(index), this.location));\n    this.skip();\n  }\n\n  private locationText(index: number|null = null) {\n    if (index == null) index = this.index;\n    return (index < this.tokens.length) ? `at column ${this.tokens[index].index + 1} in` :\n                                          `at the end of the expression`;\n  }\n\n  /**\n   * Records an error for an unexpected private identifier being discovered.\n   * @param token Token representing a private identifier.\n   * @param extraMessage Optional additional message being appended to the error.\n   */\n  private _reportErrorForPrivateIdentifier(token: Token, extraMessage: string|null) {\n    let errorMessage =\n        `Private identifiers are not supported. Unexpected private identifier: ${token}`;\n    if (extraMessage !== null) {\n      errorMessage += `, ${extraMessage}`;\n    }\n    this.error(errorMessage);\n  }\n\n  /**\n   * Error recovery should skip tokens until it encounters a recovery point.\n   *\n   * The following are treated as unconditional recovery points:\n   *   - end of input\n   *   - ';' (parseChain() is always the root production, and it expects a ';')\n   *   - '|' (since pipes may be chained and each pipe expression may be treated independently)\n   *\n   * The following are conditional recovery points:\n   *   - ')', '}', ']' if one of calling productions is expecting one of these symbols\n   *     - This allows skip() to recover from errors such as '(a.) + 1' allowing more of the AST to\n   *       be retained (it doesn't skip any tokens as the ')' is retained because of the '(' begins\n   *       an '(' <expr> ')' production).\n   *       The recovery points of grouping symbols must be conditional as they must be skipped if\n   *       none of the calling productions are not expecting the closing token else we will never\n   *       make progress in the case of an extraneous group closing symbol (such as a stray ')').\n   *       That is, we skip a closing symbol if we are not in a grouping production.\n   *   - '=' in a `Writable` context\n   *     - In this context, we are able to recover after seeing the `=` operator, which\n   *       signals the presence of an independent rvalue expression following the `=` operator.\n   *\n   * If a production expects one of these token it increments the corresponding nesting count,\n   * and then decrements it just prior to checking if the token is in the input.\n   */\n  private skip() {\n    let n = this.next;\n    while (this.index < this.tokens.length && !n.isCharacter(chars.$SEMICOLON) &&\n           !n.isOperator('|') && (this.rparensExpected <= 0 || !n.isCharacter(chars.$RPAREN)) &&\n           (this.rbracesExpected <= 0 || !n.isCharacter(chars.$RBRACE)) &&\n           (this.rbracketsExpected <= 0 || !n.isCharacter(chars.$RBRACKET)) &&\n           (!(this.context & ParseContextFlags.Writable) || !n.isOperator('='))) {\n      if (this.next.isError()) {\n        this.errors.push(\n            new ParserError(this.next.toString()!, this.input, this.locationText(), this.location));\n      }\n      this.advance();\n      n = this.next;\n    }\n  }\n}\n\nclass SimpleExpressionChecker implements AstVisitor {\n  errors: string[] = [];\n\n  visitImplicitReceiver(ast: ImplicitReceiver, context: any) {}\n\n  visitThisReceiver(ast: ThisReceiver, context: any) {}\n\n  visitInterpolation(ast: Interpolation, context: any) {}\n\n  visitLiteralPrimitive(ast: LiteralPrimitive, context: any) {}\n\n  visitPropertyRead(ast: PropertyRead, context: any) {}\n\n  visitPropertyWrite(ast: PropertyWrite, context: any) {}\n\n  visitSafePropertyRead(ast: SafePropertyRead, context: any) {}\n\n  visitMethodCall(ast: MethodCall, context: any) {}\n\n  visitSafeMethodCall(ast: SafeMethodCall, context: any) {}\n\n  visitFunctionCall(ast: FunctionCall, context: any) {}\n\n  visitLiteralArray(ast: LiteralArray, context: any) {\n    this.visitAll(ast.expressions, context);\n  }\n\n  visitLiteralMap(ast: LiteralMap, context: any) {\n    this.visitAll(ast.values, context);\n  }\n\n  visitUnary(ast: Unary, context: any) {}\n\n  visitBinary(ast: Binary, context: any) {}\n\n  visitPrefixNot(ast: PrefixNot, context: any) {}\n\n  visitNonNullAssert(ast: NonNullAssert, context: any) {}\n\n  visitConditional(ast: Conditional, context: any) {}\n\n  visitPipe(ast: BindingPipe, context: any) {\n    this.errors.push('pipes');\n  }\n\n  visitKeyedRead(ast: KeyedRead, context: any) {}\n\n  visitKeyedWrite(ast: KeyedWrite, context: any) {}\n\n  visitAll(asts: any[], context: any): any[] {\n    return asts.map(node => node.visit(this, context));\n  }\n\n  visitChain(ast: Chain, context: any) {}\n\n  visitQuote(ast: Quote, context: any) {}\n\n  visitSafeKeyedRead(ast: SafeKeyedRead, context: any) {}\n}\n\n/**\n * This class implements SimpleExpressionChecker used in View Engine and performs more strict checks\n * to make sure host bindings do not contain pipes. In View Engine, having pipes in host bindings is\n * not supported as well, but in some cases (like `!(value | async)`) the error is not triggered at\n * compile time. In order to preserve View Engine behavior, more strict checks are introduced for\n * Ivy mode only.\n */\nclass IvySimpleExpressionChecker extends RecursiveAstVisitor implements SimpleExpressionChecker {\n  errors: string[] = [];\n\n  override visitPipe() {\n    this.errors.push('pipes');\n  }\n}\n"]}