expression_converter.js

/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define("@angular/compiler/src/compiler_util/expression_converter", ["require", "exports", "tslib", "@angular/compiler/src/expression_parser/ast", "@angular/compiler/src/identifiers", "@angular/compiler/src/output/output_ast", "@angular/compiler/src/parse_util"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    var tslib_1 = require("tslib");
    var cdAst = require("@angular/compiler/src/expression_parser/ast");
    var identifiers_1 = require("@angular/compiler/src/identifiers");
    var o = require("@angular/compiler/src/output/output_ast");
    var parse_util_1 = require("@angular/compiler/src/parse_util");
    var EventHandlerVars = /** @class */ (function () {
        function EventHandlerVars() {
        }
        EventHandlerVars.event = o.variable('$event');
        return EventHandlerVars;
    }());
    exports.EventHandlerVars = EventHandlerVars;
    var ConvertActionBindingResult = /** @class */ (function () {
        function ConvertActionBindingResult(
        /**
         * Render2 compatible statements,
         */
        stmts, 
        /**
         * Variable name used with render2 compatible statements.
         */
        allowDefault) {
            this.stmts = stmts;
            this.allowDefault = allowDefault;
            /**
             * This is bit of a hack. It converts statements which render2 expects to statements which are
             * expected by render3.
             *
             * Example: `<div click="doSomething($event)">` will generate:
             *
             * Render3:
             * ```
             * const pd_b:any = ((<any>ctx.doSomething($event)) !== false);
             * return pd_b;
             * ```
             *
             * but render2 expects:
             * ```
             * return ctx.doSomething($event);
             * ```
             */
            // TODO(misko): remove this hack once we no longer support ViewEngine.
            this.render3Stmts = stmts.map(function (statement) {
                if (statement instanceof o.DeclareVarStmt && statement.name == allowDefault.name &&
                    statement.value instanceof o.BinaryOperatorExpr) {
                    var lhs = statement.value.lhs;
                    return new o.ReturnStatement(lhs.value);
                }
                return statement;
            });
        }
        return ConvertActionBindingResult;
    }());
    exports.ConvertActionBindingResult = ConvertActionBindingResult;
    /**
     * Converts the given expression AST into an executable output AST, assuming the expression is
     * used in an action binding (e.g. an event handler).
     */
    function convertActionBinding(localResolver, implicitReceiver, action, bindingId, interpolationFunction, baseSourceSpan) {
        if (!localResolver) {
            localResolver = new DefaultLocalResolver();
        }
        var actionWithoutBuiltins = convertPropertyBindingBuiltins({
            createLiteralArrayConverter: function (argCount) {
                // Note: no caching for literal arrays in actions.
                return function (args) { return o.literalArr(args); };
            },
            createLiteralMapConverter: function (keys) {
                // Note: no caching for literal maps in actions.
                return function (values) {
                    var entries = keys.map(function (k, i) { return ({
                        key: k.key,
                        value: values[i],
                        quoted: k.quoted,
                    }); });
                    return o.literalMap(entries);
                };
            },
            createPipeConverter: function (name) {
                throw new Error("Illegal State: Actions are not allowed to contain pipes. Pipe: " + name);
            }
        }, action);
        var visitor = new _AstToIrVisitor(localResolver, implicitReceiver, bindingId, interpolationFunction, baseSourceSpan);
        var actionStmts = [];
        flattenStatements(actionWithoutBuiltins.visit(visitor, _Mode.Statement), actionStmts);
        prependTemporaryDecls(visitor.temporaryCount, bindingId, actionStmts);
        if (visitor.usesImplicitReceiver) {
            localResolver.notifyImplicitReceiverUse();
        }
        var lastIndex = actionStmts.length - 1;
        var preventDefaultVar = null;
        if (lastIndex >= 0) {
            var lastStatement = actionStmts[lastIndex];
            var returnExpr = convertStmtIntoExpression(lastStatement);
            if (returnExpr) {
                // Note: We need to cast the result of the method call to dynamic,
                // as it might be a void method!
                preventDefaultVar = createPreventDefaultVar(bindingId);
                actionStmts[lastIndex] =
                    preventDefaultVar.set(returnExpr.cast(o.DYNAMIC_TYPE).notIdentical(o.literal(false)))
                        .toDeclStmt(null, [o.StmtModifier.Final]);
            }
        }
        return new ConvertActionBindingResult(actionStmts, preventDefaultVar);
    }
    exports.convertActionBinding = convertActionBinding;
    function convertPropertyBindingBuiltins(converterFactory, ast) {
        return convertBuiltins(converterFactory, ast);
    }
    exports.convertPropertyBindingBuiltins = convertPropertyBindingBuiltins;
    var ConvertPropertyBindingResult = /** @class */ (function () {
        function ConvertPropertyBindingResult(stmts, currValExpr) {
            this.stmts = stmts;
            this.currValExpr = currValExpr;
        }
        return ConvertPropertyBindingResult;
    }());
    exports.ConvertPropertyBindingResult = ConvertPropertyBindingResult;
    var BindingForm;
    (function (BindingForm) {
        // The general form of binding expression, supports all expressions.
        BindingForm[BindingForm["General"] = 0] = "General";
        // Try to generate a simple binding (no temporaries or statements)
        // otherwise generate a general binding
        BindingForm[BindingForm["TrySimple"] = 1] = "TrySimple";
    })(BindingForm = exports.BindingForm || (exports.BindingForm = {}));
    /**
     * Converts the given expression AST into an executable output AST, assuming the expression
     * is used in property binding. The expression has to be preprocessed via
     * `convertPropertyBindingBuiltins`.
     */
    function convertPropertyBinding(localResolver, implicitReceiver, expressionWithoutBuiltins, bindingId, form, interpolationFunction) {
        if (!localResolver) {
            localResolver = new DefaultLocalResolver();
        }
        var currValExpr = createCurrValueExpr(bindingId);
        var visitor = new _AstToIrVisitor(localResolver, implicitReceiver, bindingId, interpolationFunction);
        var outputExpr = expressionWithoutBuiltins.visit(visitor, _Mode.Expression);
        var stmts = getStatementsFromVisitor(visitor, bindingId);
        if (visitor.usesImplicitReceiver) {
            localResolver.notifyImplicitReceiverUse();
        }
        if (visitor.temporaryCount === 0 && form == BindingForm.TrySimple) {
            return new ConvertPropertyBindingResult([], outputExpr);
        }
        stmts.push(currValExpr.set(outputExpr).toDeclStmt(o.DYNAMIC_TYPE, [o.StmtModifier.Final]));
        return new ConvertPropertyBindingResult(stmts, currValExpr);
    }
    exports.convertPropertyBinding = convertPropertyBinding;
    /**
     * Given some expression, such as a binding or interpolation expression, and a context expression to
     * look values up on, visit each facet of the given expression resolving values from the context
     * expression such that a list of arguments can be derived from the found values that can be used as
     * arguments to an external update instruction.
     *
     * @param localResolver The resolver to use to look up expressions by name appropriately
     * @param contextVariableExpression The expression representing the context variable used to create
     * the final argument expressions
     * @param expressionWithArgumentsToExtract The expression to visit to figure out what values need to
     * be resolved and what arguments list to build.
     * @param bindingId A name prefix used to create temporary variable names if they're needed for the
     * arguments generated
     * @returns An array of expressions that can be passed as arguments to instruction expressions like
     * `o.importExpr(R3.propertyInterpolate).callFn(result)`
     */
    function convertUpdateArguments(localResolver, contextVariableExpression, expressionWithArgumentsToExtract, bindingId) {
        var visitor = new _AstToIrVisitor(localResolver, contextVariableExpression, bindingId, undefined);
        var outputExpr = expressionWithArgumentsToExtract.visit(visitor, _Mode.Expression);
        if (visitor.usesImplicitReceiver) {
            localResolver.notifyImplicitReceiverUse();
        }
        var stmts = getStatementsFromVisitor(visitor, bindingId);
        // Removing the first argument, because it was a length for ViewEngine, not Ivy.
        var args = outputExpr.args.slice(1);
        if (expressionWithArgumentsToExtract instanceof cdAst.Interpolation) {
            // If we're dealing with an interpolation of 1 value with an empty prefix and suffix, reduce the
            // args returned to just the value, because we're going to pass it to a special instruction.
            var strings = expressionWithArgumentsToExtract.strings;
            if (args.length === 3 && strings[0] === '' && strings[1] === '') {
                // Single argument interpolate instructions.
                args = [args[1]];
            }
            else if (args.length >= 19) {
                // 19 or more arguments must be passed to the `interpolateV`-style instructions, which accept
                // an array of arguments
                args = [o.literalArr(args)];
            }
        }
        return { stmts: stmts, args: args };
    }
    exports.convertUpdateArguments = convertUpdateArguments;
    function getStatementsFromVisitor(visitor, bindingId) {
        var stmts = [];
        for (var i = 0; i < visitor.temporaryCount; i++) {
            stmts.push(temporaryDeclaration(bindingId, i));
        }
        return stmts;
    }
    function convertBuiltins(converterFactory, ast) {
        var visitor = new _BuiltinAstConverter(converterFactory);
        return ast.visit(visitor);
    }
    function temporaryName(bindingId, temporaryNumber) {
        return "tmp_" + bindingId + "_" + temporaryNumber;
    }
    function temporaryDeclaration(bindingId, temporaryNumber) {
        return new o.DeclareVarStmt(temporaryName(bindingId, temporaryNumber), o.NULL_EXPR);
    }
    exports.temporaryDeclaration = temporaryDeclaration;
    function prependTemporaryDecls(temporaryCount, bindingId, statements) {
        for (var i = temporaryCount - 1; i >= 0; i--) {
            statements.unshift(temporaryDeclaration(bindingId, i));
        }
    }
    var _Mode;
    (function (_Mode) {
        _Mode[_Mode["Statement"] = 0] = "Statement";
        _Mode[_Mode["Expression"] = 1] = "Expression";
    })(_Mode || (_Mode = {}));
    function ensureStatementMode(mode, ast) {
        if (mode !== _Mode.Statement) {
            throw new Error("Expected a statement, but saw " + ast);
        }
    }
    function ensureExpressionMode(mode, ast) {
        if (mode !== _Mode.Expression) {
            throw new Error("Expected an expression, but saw " + ast);
        }
    }
    function convertToStatementIfNeeded(mode, expr) {
        if (mode === _Mode.Statement) {
            return expr.toStmt();
        }
        else {
            return expr;
        }
    }
    var _BuiltinAstConverter = /** @class */ (function (_super) {
        tslib_1.__extends(_BuiltinAstConverter, _super);
        function _BuiltinAstConverter(_converterFactory) {
            var _this = _super.call(this) || this;
            _this._converterFactory = _converterFactory;
            return _this;
        }
        _BuiltinAstConverter.prototype.visitPipe = function (ast, context) {
            var _this = this;
            var args = tslib_1.__spread([ast.exp], ast.args).map(function (ast) { return ast.visit(_this, context); });
            return new BuiltinFunctionCall(ast.span, args, this._converterFactory.createPipeConverter(ast.name, args.length));
        };
        _BuiltinAstConverter.prototype.visitLiteralArray = function (ast, context) {
            var _this = this;
            var args = ast.expressions.map(function (ast) { return ast.visit(_this, context); });
            return new BuiltinFunctionCall(ast.span, args, this._converterFactory.createLiteralArrayConverter(ast.expressions.length));
        };
        _BuiltinAstConverter.prototype.visitLiteralMap = function (ast, context) {
            var _this = this;
            var args = ast.values.map(function (ast) { return ast.visit(_this, context); });
            return new BuiltinFunctionCall(ast.span, args, this._converterFactory.createLiteralMapConverter(ast.keys));
        };
        return _BuiltinAstConverter;
    }(cdAst.AstTransformer));
    var _AstToIrVisitor = /** @class */ (function () {
        function _AstToIrVisitor(_localResolver, _implicitReceiver, bindingId, interpolationFunction, baseSourceSpan) {
            this._localResolver = _localResolver;
            this._implicitReceiver = _implicitReceiver;
            this.bindingId = bindingId;
            this.interpolationFunction = interpolationFunction;
            this.baseSourceSpan = baseSourceSpan;
            this._nodeMap = new Map();
            this._resultMap = new Map();
            this._currentTemporary = 0;
            this.temporaryCount = 0;
            this.usesImplicitReceiver = false;
        }
        _AstToIrVisitor.prototype.visitBinary = function (ast, mode) {
            var op;
            switch (ast.operation) {
                case '+':
                    op = o.BinaryOperator.Plus;
                    break;
                case '-':
                    op = o.BinaryOperator.Minus;
                    break;
                case '*':
                    op = o.BinaryOperator.Multiply;
                    break;
                case '/':
                    op = o.BinaryOperator.Divide;
                    break;
                case '%':
                    op = o.BinaryOperator.Modulo;
                    break;
                case '&&':
                    op = o.BinaryOperator.And;
                    break;
                case '||':
                    op = o.BinaryOperator.Or;
                    break;
                case '==':
                    op = o.BinaryOperator.Equals;
                    break;
                case '!=':
                    op = o.BinaryOperator.NotEquals;
                    break;
                case '===':
                    op = o.BinaryOperator.Identical;
                    break;
                case '!==':
                    op = o.BinaryOperator.NotIdentical;
                    break;
                case '<':
                    op = o.BinaryOperator.Lower;
                    break;
                case '>':
                    op = o.BinaryOperator.Bigger;
                    break;
                case '<=':
                    op = o.BinaryOperator.LowerEquals;
                    break;
                case '>=':
                    op = o.BinaryOperator.BiggerEquals;
                    break;
                default:
                    throw new Error("Unsupported operation " + ast.operation);
            }
            return convertToStatementIfNeeded(mode, new o.BinaryOperatorExpr(op, this._visit(ast.left, _Mode.Expression), this._visit(ast.right, _Mode.Expression), undefined, this.convertSourceSpan(ast.span)));
        };
        _AstToIrVisitor.prototype.visitChain = function (ast, mode) {
            ensureStatementMode(mode, ast);
            return this.visitAll(ast.expressions, mode);
        };
        _AstToIrVisitor.prototype.visitConditional = function (ast, mode) {
            var value = this._visit(ast.condition, _Mode.Expression);
            return convertToStatementIfNeeded(mode, value.conditional(this._visit(ast.trueExp, _Mode.Expression), this._visit(ast.falseExp, _Mode.Expression), this.convertSourceSpan(ast.span)));
        };
        _AstToIrVisitor.prototype.visitPipe = function (ast, mode) {
            throw new Error("Illegal state: Pipes should have been converted into functions. Pipe: " + ast.name);
        };
        _AstToIrVisitor.prototype.visitFunctionCall = function (ast, mode) {
            var convertedArgs = this.visitAll(ast.args, _Mode.Expression);
            var fnResult;
            if (ast instanceof BuiltinFunctionCall) {
                fnResult = ast.converter(convertedArgs);
            }
            else {
                fnResult = this._visit(ast.target, _Mode.Expression)
                    .callFn(convertedArgs, this.convertSourceSpan(ast.span));
            }
            return convertToStatementIfNeeded(mode, fnResult);
        };
        _AstToIrVisitor.prototype.visitImplicitReceiver = function (ast, mode) {
            ensureExpressionMode(mode, ast);
            this.usesImplicitReceiver = true;
            return this._implicitReceiver;
        };
        _AstToIrVisitor.prototype.visitInterpolation = function (ast, mode) {
            ensureExpressionMode(mode, ast);
            var args = [o.literal(ast.expressions.length)];
            for (var i = 0; i < ast.strings.length - 1; i++) {
                args.push(o.literal(ast.strings[i]));
                args.push(this._visit(ast.expressions[i], _Mode.Expression));
            }
            args.push(o.literal(ast.strings[ast.strings.length - 1]));
            if (this.interpolationFunction) {
                return this.interpolationFunction(args);
            }
            return ast.expressions.length <= 9 ?
                o.importExpr(identifiers_1.Identifiers.inlineInterpolate).callFn(args) :
                o.importExpr(identifiers_1.Identifiers.interpolate).callFn([
                    args[0], o.literalArr(args.slice(1), undefined, this.convertSourceSpan(ast.span))
                ]);
        };
        _AstToIrVisitor.prototype.visitKeyedRead = function (ast, mode) {
            var leftMostSafe = this.leftMostSafeNode(ast);
            if (leftMostSafe) {
                return this.convertSafeAccess(ast, leftMostSafe, mode);
            }
            else {
                return convertToStatementIfNeeded(mode, this._visit(ast.obj, _Mode.Expression).key(this._visit(ast.key, _Mode.Expression)));
            }
        };
        _AstToIrVisitor.prototype.visitKeyedWrite = function (ast, mode) {
            var obj = this._visit(ast.obj, _Mode.Expression);
            var key = this._visit(ast.key, _Mode.Expression);
            var value = this._visit(ast.value, _Mode.Expression);
            return convertToStatementIfNeeded(mode, obj.key(key).set(value));
        };
        _AstToIrVisitor.prototype.visitLiteralArray = function (ast, mode) {
            throw new Error("Illegal State: literal arrays should have been converted into functions");
        };
        _AstToIrVisitor.prototype.visitLiteralMap = function (ast, mode) {
            throw new Error("Illegal State: literal maps should have been converted into functions");
        };
        _AstToIrVisitor.prototype.visitLiteralPrimitive = function (ast, mode) {
            // For literal values of null, undefined, true, or false allow type interference
            // to infer the type.
            var type = ast.value === null || ast.value === undefined || ast.value === true || ast.value === true ?
                o.INFERRED_TYPE :
                undefined;
            return convertToStatementIfNeeded(mode, o.literal(ast.value, type, this.convertSourceSpan(ast.span)));
        };
        _AstToIrVisitor.prototype._getLocal = function (name) { return this._localResolver.getLocal(name); };
        _AstToIrVisitor.prototype.visitMethodCall = function (ast, mode) {
            if (ast.receiver instanceof cdAst.ImplicitReceiver && ast.name == '$any') {
                var args = this.visitAll(ast.args, _Mode.Expression);
                if (args.length != 1) {
                    throw new Error("Invalid call to $any, expected 1 argument but received " + (args.length || 'none'));
                }
                return args[0].cast(o.DYNAMIC_TYPE, this.convertSourceSpan(ast.span));
            }
            var leftMostSafe = this.leftMostSafeNode(ast);
            if (leftMostSafe) {
                return this.convertSafeAccess(ast, leftMostSafe, mode);
            }
            else {
                var args = this.visitAll(ast.args, _Mode.Expression);
                var prevUsesImplicitReceiver = this.usesImplicitReceiver;
                var result = null;
                var receiver = this._visit(ast.receiver, _Mode.Expression);
                if (receiver === this._implicitReceiver) {
                    var varExpr = this._getLocal(ast.name);
                    if (varExpr) {
                        // Restore the previous "usesImplicitReceiver" state since the implicit
                        // receiver has been replaced with a resolved local expression.
                        this.usesImplicitReceiver = prevUsesImplicitReceiver;
                        result = varExpr.callFn(args);
                    }
                }
                if (result == null) {
                    result = receiver.callMethod(ast.name, args, this.convertSourceSpan(ast.span));
                }
                return convertToStatementIfNeeded(mode, result);
            }
        };
        _AstToIrVisitor.prototype.visitPrefixNot = function (ast, mode) {
            return convertToStatementIfNeeded(mode, o.not(this._visit(ast.expression, _Mode.Expression)));
        };
        _AstToIrVisitor.prototype.visitNonNullAssert = function (ast, mode) {
            return convertToStatementIfNeeded(mode, o.assertNotNull(this._visit(ast.expression, _Mode.Expression)));
        };
        _AstToIrVisitor.prototype.visitPropertyRead = function (ast, mode) {
            var leftMostSafe = this.leftMostSafeNode(ast);
            if (leftMostSafe) {
                return this.convertSafeAccess(ast, leftMostSafe, mode);
            }
            else {
                var result = null;
                var prevUsesImplicitReceiver = this.usesImplicitReceiver;
                var receiver = this._visit(ast.receiver, _Mode.Expression);
                if (receiver === this._implicitReceiver) {
                    result = this._getLocal(ast.name);
                    if (result) {
                        // Restore the previous "usesImplicitReceiver" state since the implicit
                        // receiver has been replaced with a resolved local expression.
                        this.usesImplicitReceiver = prevUsesImplicitReceiver;
                    }
                }
                if (result == null) {
                    result = receiver.prop(ast.name);
                }
                return convertToStatementIfNeeded(mode, result);
            }
        };
        _AstToIrVisitor.prototype.visitPropertyWrite = function (ast, mode) {
            var receiver = this._visit(ast.receiver, _Mode.Expression);
            var prevUsesImplicitReceiver = this.usesImplicitReceiver;
            var varExpr = null;
            if (receiver === this._implicitReceiver) {
                var localExpr = this._getLocal(ast.name);
                if (localExpr) {
                    if (localExpr instanceof o.ReadPropExpr) {
                        // If the local variable is a property read expression, it's a reference
                        // to a 'context.property' value and will be used as the target of the
                        // write expression.
                        varExpr = localExpr;
                        // Restore the previous "usesImplicitReceiver" state since the implicit
                        // receiver has been replaced with a resolved local expression.
                        this.usesImplicitReceiver = prevUsesImplicitReceiver;
                    }
                    else {
                        // Otherwise it's an error.
                        throw new Error('Cannot assign to a reference or variable!');
                    }
                }
            }
            // If no local expression could be produced, use the original receiver's
            // property as the target.
            if (varExpr === null) {
                varExpr = receiver.prop(ast.name);
            }
            return convertToStatementIfNeeded(mode, varExpr.set(this._visit(ast.value, _Mode.Expression)));
        };
        _AstToIrVisitor.prototype.visitSafePropertyRead = function (ast, mode) {
            return this.convertSafeAccess(ast, this.leftMostSafeNode(ast), mode);
        };
        _AstToIrVisitor.prototype.visitSafeMethodCall = function (ast, mode) {
            return this.convertSafeAccess(ast, this.leftMostSafeNode(ast), mode);
        };
        _AstToIrVisitor.prototype.visitAll = function (asts, mode) {
            var _this = this;
            return asts.map(function (ast) { return _this._visit(ast, mode); });
        };
        _AstToIrVisitor.prototype.visitQuote = function (ast, mode) {
            throw new Error("Quotes are not supported for evaluation!\n        Statement: " + ast.uninterpretedExpression + " located at " + ast.location);
        };
        _AstToIrVisitor.prototype._visit = function (ast, mode) {
            var result = this._resultMap.get(ast);
            if (result)
                return result;
            return (this._nodeMap.get(ast) || ast).visit(this, mode);
        };
        _AstToIrVisitor.prototype.convertSafeAccess = function (ast, leftMostSafe, mode) {
            // If the expression contains a safe access node on the left it needs to be converted to
            // an expression that guards the access to the member by checking the receiver for blank. As
            // execution proceeds from left to right, the left most part of the expression must be guarded
            // first but, because member access is left associative, the right side of the expression is at
            // the top of the AST. The desired result requires lifting a copy of the the left part of the
            // expression up to test it for blank before generating the unguarded version.
            // Consider, for example the following expression: a?.b.c?.d.e
            // This results in the ast:
            //         .
            //        / \
            //       ?.   e
            //      /  \
            //     .    d
            //    / \
            //   ?.  c
            //  /  \
            // a    b
            // The following tree should be generated:
            //
            //        /---- ? ----\
            //       /      |      \
            //     a   /--- ? ---\  null
            //        /     |     \
            //       .      .     null
            //      / \    / \
            //     .  c   .   e
            //    / \    / \
            //   a   b  .   d
            //         / \
            //        .   c
            //       / \
            //      a   b
            //
            // Notice that the first guard condition is the left hand of the left most safe access node
            // which comes in as leftMostSafe to this routine.
            var guardedExpression = this._visit(leftMostSafe.receiver, _Mode.Expression);
            var temporary = undefined;
            if (this.needsTemporary(leftMostSafe.receiver)) {
                // If the expression has method calls or pipes then we need to save the result into a
                // temporary variable to avoid calling stateful or impure code more than once.
                temporary = this.allocateTemporary();
                // Preserve the result in the temporary variable
                guardedExpression = temporary.set(guardedExpression);
                // Ensure all further references to the guarded expression refer to the temporary instead.
                this._resultMap.set(leftMostSafe.receiver, temporary);
            }
            var condition = guardedExpression.isBlank();
            // Convert the ast to an unguarded access to the receiver's member. The map will substitute
            // leftMostNode with its unguarded version in the call to `this.visit()`.
            if (leftMostSafe instanceof cdAst.SafeMethodCall) {
                this._nodeMap.set(leftMostSafe, new cdAst.MethodCall(leftMostSafe.span, leftMostSafe.receiver, leftMostSafe.name, leftMostSafe.args));
            }
            else {
                this._nodeMap.set(leftMostSafe, new cdAst.PropertyRead(leftMostSafe.span, leftMostSafe.receiver, leftMostSafe.name));
            }
            // Recursively convert the node now without the guarded member access.
            var access = this._visit(ast, _Mode.Expression);
            // Remove the mapping. This is not strictly required as the converter only traverses each node
            // once but is safer if the conversion is changed to traverse the nodes more than once.
            this._nodeMap.delete(leftMostSafe);
            // If we allocated a temporary, release it.
            if (temporary) {
                this.releaseTemporary(temporary);
            }
            // Produce the conditional
            return convertToStatementIfNeeded(mode, condition.conditional(o.literal(null), access));
        };
        // Given a expression of the form a?.b.c?.d.e the the left most safe node is
        // the (a?.b). The . and ?. are left associative thus can be rewritten as:
        // ((((a?.c).b).c)?.d).e. This returns the most deeply nested safe read or
        // safe method call as this needs be transform initially to:
        //   a == null ? null : a.c.b.c?.d.e
        // then to:
        //   a == null ? null : a.b.c == null ? null : a.b.c.d.e
        _AstToIrVisitor.prototype.leftMostSafeNode = function (ast) {
            var _this = this;
            var visit = function (visitor, ast) {
                return (_this._nodeMap.get(ast) || ast).visit(visitor);
            };
            return ast.visit({
                visitBinary: function (ast) { return null; },
                visitChain: function (ast) { return null; },
                visitConditional: function (ast) { return null; },
                visitFunctionCall: function (ast) { return null; },
                visitImplicitReceiver: function (ast) { return null; },
                visitInterpolation: function (ast) { return null; },
                visitKeyedRead: function (ast) { return visit(this, ast.obj); },
                visitKeyedWrite: function (ast) { return null; },
                visitLiteralArray: function (ast) { return null; },
                visitLiteralMap: function (ast) { return null; },
                visitLiteralPrimitive: function (ast) { return null; },
                visitMethodCall: function (ast) { return visit(this, ast.receiver); },
                visitPipe: function (ast) { return null; },
                visitPrefixNot: function (ast) { return null; },
                visitNonNullAssert: function (ast) { return null; },
                visitPropertyRead: function (ast) { return visit(this, ast.receiver); },
                visitPropertyWrite: function (ast) { return null; },
                visitQuote: function (ast) { return null; },
                visitSafeMethodCall: function (ast) { return visit(this, ast.receiver) || ast; },
                visitSafePropertyRead: function (ast) {
                    return visit(this, ast.receiver) || ast;
                }
            });
        };
        // Returns true of the AST includes a method or a pipe indicating that, if the
        // expression is used as the target of a safe property or method access then
        // the expression should be stored into a temporary variable.
        _AstToIrVisitor.prototype.needsTemporary = function (ast) {
            var _this = this;
            var visit = function (visitor, ast) {
                return ast && (_this._nodeMap.get(ast) || ast).visit(visitor);
            };
            var visitSome = function (visitor, ast) {
                return ast.some(function (ast) { return visit(visitor, ast); });
            };
            return ast.visit({
                visitBinary: function (ast) { return visit(this, ast.left) || visit(this, ast.right); },
                visitChain: function (ast) { return false; },
                visitConditional: function (ast) {
                    return visit(this, ast.condition) || visit(this, ast.trueExp) ||
                        visit(this, ast.falseExp);
                },
                visitFunctionCall: function (ast) { return true; },
                visitImplicitReceiver: function (ast) { return false; },
                visitInterpolation: function (ast) { return visitSome(this, ast.expressions); },
                visitKeyedRead: function (ast) { return false; },
                visitKeyedWrite: function (ast) { return false; },
                visitLiteralArray: function (ast) { return true; },
                visitLiteralMap: function (ast) { return true; },
                visitLiteralPrimitive: function (ast) { return false; },
                visitMethodCall: function (ast) { return true; },
                visitPipe: function (ast) { return true; },
                visitPrefixNot: function (ast) { return visit(this, ast.expression); },
                visitNonNullAssert: function (ast) { return visit(this, ast.expression); },
                visitPropertyRead: function (ast) { return false; },
                visitPropertyWrite: function (ast) { return false; },
                visitQuote: function (ast) { return false; },
                visitSafeMethodCall: function (ast) { return true; },
                visitSafePropertyRead: function (ast) { return false; }
            });
        };
        _AstToIrVisitor.prototype.allocateTemporary = function () {
            var tempNumber = this._currentTemporary++;
            this.temporaryCount = Math.max(this._currentTemporary, this.temporaryCount);
            return new o.ReadVarExpr(temporaryName(this.bindingId, tempNumber));
        };
        _AstToIrVisitor.prototype.releaseTemporary = function (temporary) {
            this._currentTemporary--;
            if (temporary.name != temporaryName(this.bindingId, this._currentTemporary)) {
                throw new Error("Temporary " + temporary.name + " released out of order");
            }
        };
        /**
         * Creates an absolute `ParseSourceSpan` from the relative `ParseSpan`.
         *
         * `ParseSpan` objects are relative to the start of the expression.
         * This method converts these to full `ParseSourceSpan` objects that
         * show where the span is within the overall source file.
         *
         * @param span the relative span to convert.
         * @returns a `ParseSourceSpan` for the the given span or null if no
         * `baseSourceSpan` was provided to this class.
         */
        _AstToIrVisitor.prototype.convertSourceSpan = function (span) {
            if (this.baseSourceSpan) {
                var start = this.baseSourceSpan.start.moveBy(span.start);
                var end = this.baseSourceSpan.start.moveBy(span.end);
                return new parse_util_1.ParseSourceSpan(start, end);
            }
            else {
                return null;
            }
        };
        return _AstToIrVisitor;
    }());
    function flattenStatements(arg, output) {
        if (Array.isArray(arg)) {
            arg.forEach(function (entry) { return flattenStatements(entry, output); });
        }
        else {
            output.push(arg);
        }
    }
    var DefaultLocalResolver = /** @class */ (function () {
        function DefaultLocalResolver() {
        }
        DefaultLocalResolver.prototype.notifyImplicitReceiverUse = function () { };
        DefaultLocalResolver.prototype.getLocal = function (name) {
            if (name === EventHandlerVars.event.name) {
                return EventHandlerVars.event;
            }
            return null;
        };
        return DefaultLocalResolver;
    }());
    function createCurrValueExpr(bindingId) {
        return o.variable("currVal_" + bindingId); // fix syntax highlighting: `
    }
    function createPreventDefaultVar(bindingId) {
        return o.variable("pd_" + bindingId);
    }
    function convertStmtIntoExpression(stmt) {
        if (stmt instanceof o.ExpressionStatement) {
            return stmt.expr;
        }
        else if (stmt instanceof o.ReturnStatement) {
            return stmt.value;
        }
        return null;
    }
    var BuiltinFunctionCall = /** @class */ (function (_super) {
        tslib_1.__extends(BuiltinFunctionCall, _super);
        function BuiltinFunctionCall(span, args, converter) {
            var _this = _super.call(this, span, null, args) || this;
            _this.args = args;
            _this.converter = converter;
            return _this;
        }
        return BuiltinFunctionCall;
    }(cdAst.FunctionCall));
    exports.BuiltinFunctionCall = BuiltinFunctionCall;
});
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* @license\n * Copyright Google Inc. All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport * as cdAst from '../expression_parser/ast';\nimport {Identifiers} from '../identifiers';\nimport * as o from '../output/output_ast';\nimport {ParseSourceSpan} from '../parse_util';\n\nexport class EventHandlerVars { static event = o.variable('$event'); }\n\nexport interface LocalResolver {\n  getLocal(name: string): o.Expression|null;\n  notifyImplicitReceiverUse(): void;\n}\n\nexport class ConvertActionBindingResult {\n  /**\n   * Store statements which are render3 compatible.\n   */\n  render3Stmts: o.Statement[];\n  constructor(\n      /**\n       * Render2 compatible statements,\n       */\n      public stmts: o.Statement[],\n      /**\n       * Variable name used with render2 compatible statements.\n       */\n      public allowDefault: o.ReadVarExpr) {\n    /**\n     * This is bit of a hack. It converts statements which render2 expects to statements which are\n     * expected by render3.\n     *\n     * Example: `<div click=\"doSomething($event)\">` will generate:\n     *\n     * Render3:\n     * ```\n     * const pd_b:any = ((<any>ctx.doSomething($event)) !== false);\n     * return pd_b;\n     * ```\n     *\n     * but render2 expects:\n     * ```\n     * return ctx.doSomething($event);\n     * ```\n     */\n    // TODO(misko): remove this hack once we no longer support ViewEngine.\n    this.render3Stmts = stmts.map((statement: o.Statement) => {\n      if (statement instanceof o.DeclareVarStmt && statement.name == allowDefault.name &&\n          statement.value instanceof o.BinaryOperatorExpr) {\n        const lhs = statement.value.lhs as o.CastExpr;\n        return new o.ReturnStatement(lhs.value);\n      }\n      return statement;\n    });\n  }\n}\n\nexport type InterpolationFunction = (args: o.Expression[]) => o.Expression;\n\n/**\n * Converts the given expression AST into an executable output AST, assuming the expression is\n * used in an action binding (e.g. an event handler).\n */\nexport function convertActionBinding(\n    localResolver: LocalResolver | null, implicitReceiver: o.Expression, action: cdAst.AST,\n    bindingId: string, interpolationFunction?: InterpolationFunction,\n    baseSourceSpan?: ParseSourceSpan): ConvertActionBindingResult {\n  if (!localResolver) {\n    localResolver = new DefaultLocalResolver();\n  }\n  const actionWithoutBuiltins = convertPropertyBindingBuiltins(\n      {\n        createLiteralArrayConverter: (argCount: number) => {\n          // Note: no caching for literal arrays in actions.\n          return (args: o.Expression[]) => o.literalArr(args);\n        },\n        createLiteralMapConverter: (keys: {key: string, quoted: boolean}[]) => {\n          // Note: no caching for literal maps in actions.\n          return (values: o.Expression[]) => {\n            const entries = keys.map((k, i) => ({\n                                       key: k.key,\n                                       value: values[i],\n                                       quoted: k.quoted,\n                                     }));\n            return o.literalMap(entries);\n          };\n        },\n        createPipeConverter: (name: string) => {\n          throw new Error(`Illegal State: Actions are not allowed to contain pipes. Pipe: ${name}`);\n        }\n      },\n      action);\n\n  const visitor = new _AstToIrVisitor(\n      localResolver, implicitReceiver, bindingId, interpolationFunction, baseSourceSpan);\n  const actionStmts: o.Statement[] = [];\n  flattenStatements(actionWithoutBuiltins.visit(visitor, _Mode.Statement), actionStmts);\n  prependTemporaryDecls(visitor.temporaryCount, bindingId, actionStmts);\n\n  if (visitor.usesImplicitReceiver) {\n    localResolver.notifyImplicitReceiverUse();\n  }\n\n  const lastIndex = actionStmts.length - 1;\n  let preventDefaultVar: o.ReadVarExpr = null !;\n  if (lastIndex >= 0) {\n    const lastStatement = actionStmts[lastIndex];\n    const returnExpr = convertStmtIntoExpression(lastStatement);\n    if (returnExpr) {\n      // Note: We need to cast the result of the method call to dynamic,\n      // as it might be a void method!\n      preventDefaultVar = createPreventDefaultVar(bindingId);\n      actionStmts[lastIndex] =\n          preventDefaultVar.set(returnExpr.cast(o.DYNAMIC_TYPE).notIdentical(o.literal(false)))\n              .toDeclStmt(null, [o.StmtModifier.Final]);\n    }\n  }\n  return new ConvertActionBindingResult(actionStmts, preventDefaultVar);\n}\n\nexport interface BuiltinConverter { (args: o.Expression[]): o.Expression; }\n\nexport interface BuiltinConverterFactory {\n  createLiteralArrayConverter(argCount: number): BuiltinConverter;\n  createLiteralMapConverter(keys: {key: string, quoted: boolean}[]): BuiltinConverter;\n  createPipeConverter(name: string, argCount: number): BuiltinConverter;\n}\n\nexport function convertPropertyBindingBuiltins(\n    converterFactory: BuiltinConverterFactory, ast: cdAst.AST): cdAst.AST {\n  return convertBuiltins(converterFactory, ast);\n}\n\nexport class ConvertPropertyBindingResult {\n  constructor(public stmts: o.Statement[], public currValExpr: o.Expression) {}\n}\n\nexport enum BindingForm {\n  // The general form of binding expression, supports all expressions.\n  General,\n\n  // Try to generate a simple binding (no temporaries or statements)\n  // otherwise generate a general binding\n  TrySimple,\n}\n\n/**\n * Converts the given expression AST into an executable output AST, assuming the expression\n * is used in property binding. The expression has to be preprocessed via\n * `convertPropertyBindingBuiltins`.\n */\nexport function convertPropertyBinding(\n    localResolver: LocalResolver | null, implicitReceiver: o.Expression,\n    expressionWithoutBuiltins: cdAst.AST, bindingId: string, form: BindingForm,\n    interpolationFunction?: InterpolationFunction): ConvertPropertyBindingResult {\n  if (!localResolver) {\n    localResolver = new DefaultLocalResolver();\n  }\n  const currValExpr = createCurrValueExpr(bindingId);\n  const visitor =\n      new _AstToIrVisitor(localResolver, implicitReceiver, bindingId, interpolationFunction);\n  const outputExpr: o.Expression = expressionWithoutBuiltins.visit(visitor, _Mode.Expression);\n  const stmts: o.Statement[] = getStatementsFromVisitor(visitor, bindingId);\n\n  if (visitor.usesImplicitReceiver) {\n    localResolver.notifyImplicitReceiverUse();\n  }\n\n  if (visitor.temporaryCount === 0 && form == BindingForm.TrySimple) {\n    return new ConvertPropertyBindingResult([], outputExpr);\n  }\n\n  stmts.push(currValExpr.set(outputExpr).toDeclStmt(o.DYNAMIC_TYPE, [o.StmtModifier.Final]));\n  return new ConvertPropertyBindingResult(stmts, currValExpr);\n}\n\n/**\n * Given some expression, such as a binding or interpolation expression, and a context expression to\n * look values up on, visit each facet of the given expression resolving values from the context\n * expression such that a list of arguments can be derived from the found values that can be used as\n * arguments to an external update instruction.\n *\n * @param localResolver The resolver to use to look up expressions by name appropriately\n * @param contextVariableExpression The expression representing the context variable used to create\n * the final argument expressions\n * @param expressionWithArgumentsToExtract The expression to visit to figure out what values need to\n * be resolved and what arguments list to build.\n * @param bindingId A name prefix used to create temporary variable names if they're needed for the\n * arguments generated\n * @returns An array of expressions that can be passed as arguments to instruction expressions like\n * `o.importExpr(R3.propertyInterpolate).callFn(result)`\n */\nexport function convertUpdateArguments(\n    localResolver: LocalResolver, contextVariableExpression: o.Expression,\n    expressionWithArgumentsToExtract: cdAst.AST, bindingId: string) {\n  const visitor =\n      new _AstToIrVisitor(localResolver, contextVariableExpression, bindingId, undefined);\n  const outputExpr: o.InvokeFunctionExpr =\n      expressionWithArgumentsToExtract.visit(visitor, _Mode.Expression);\n\n  if (visitor.usesImplicitReceiver) {\n    localResolver.notifyImplicitReceiverUse();\n  }\n\n  const stmts = getStatementsFromVisitor(visitor, bindingId);\n\n  // Removing the first argument, because it was a length for ViewEngine, not Ivy.\n  let args = outputExpr.args.slice(1);\n  if (expressionWithArgumentsToExtract instanceof cdAst.Interpolation) {\n    // If we're dealing with an interpolation of 1 value with an empty prefix and suffix, reduce the\n    // args returned to just the value, because we're going to pass it to a special instruction.\n    const strings = expressionWithArgumentsToExtract.strings;\n    if (args.length === 3 && strings[0] === '' && strings[1] === '') {\n      // Single argument interpolate instructions.\n      args = [args[1]];\n    } else if (args.length >= 19) {\n      // 19 or more arguments must be passed to the `interpolateV`-style instructions, which accept\n      // an array of arguments\n      args = [o.literalArr(args)];\n    }\n  }\n  return {stmts, args};\n}\n\nfunction getStatementsFromVisitor(visitor: _AstToIrVisitor, bindingId: string) {\n  const stmts: o.Statement[] = [];\n  for (let i = 0; i < visitor.temporaryCount; i++) {\n    stmts.push(temporaryDeclaration(bindingId, i));\n  }\n  return stmts;\n}\n\nfunction convertBuiltins(converterFactory: BuiltinConverterFactory, ast: cdAst.AST): cdAst.AST {\n  const visitor = new _BuiltinAstConverter(converterFactory);\n  return ast.visit(visitor);\n}\n\nfunction temporaryName(bindingId: string, temporaryNumber: number): string {\n  return `tmp_${bindingId}_${temporaryNumber}`;\n}\n\nexport function temporaryDeclaration(bindingId: string, temporaryNumber: number): o.Statement {\n  return new o.DeclareVarStmt(temporaryName(bindingId, temporaryNumber), o.NULL_EXPR);\n}\n\nfunction prependTemporaryDecls(\n    temporaryCount: number, bindingId: string, statements: o.Statement[]) {\n  for (let i = temporaryCount - 1; i >= 0; i--) {\n    statements.unshift(temporaryDeclaration(bindingId, i));\n  }\n}\n\nenum _Mode {\n  Statement,\n  Expression\n}\n\nfunction ensureStatementMode(mode: _Mode, ast: cdAst.AST) {\n  if (mode !== _Mode.Statement) {\n    throw new Error(`Expected a statement, but saw ${ast}`);\n  }\n}\n\nfunction ensureExpressionMode(mode: _Mode, ast: cdAst.AST) {\n  if (mode !== _Mode.Expression) {\n    throw new Error(`Expected an expression, but saw ${ast}`);\n  }\n}\n\nfunction convertToStatementIfNeeded(mode: _Mode, expr: o.Expression): o.Expression|o.Statement {\n  if (mode === _Mode.Statement) {\n    return expr.toStmt();\n  } else {\n    return expr;\n  }\n}\n\nclass _BuiltinAstConverter extends cdAst.AstTransformer {\n  constructor(private _converterFactory: BuiltinConverterFactory) { super(); }\n  visitPipe(ast: cdAst.BindingPipe, context: any): any {\n    const args = [ast.exp, ...ast.args].map(ast => ast.visit(this, context));\n    return new BuiltinFunctionCall(\n        ast.span, args, this._converterFactory.createPipeConverter(ast.name, args.length));\n  }\n  visitLiteralArray(ast: cdAst.LiteralArray, context: any): any {\n    const args = ast.expressions.map(ast => ast.visit(this, context));\n    return new BuiltinFunctionCall(\n        ast.span, args, this._converterFactory.createLiteralArrayConverter(ast.expressions.length));\n  }\n  visitLiteralMap(ast: cdAst.LiteralMap, context: any): any {\n    const args = ast.values.map(ast => ast.visit(this, context));\n\n    return new BuiltinFunctionCall(\n        ast.span, args, this._converterFactory.createLiteralMapConverter(ast.keys));\n  }\n}\n\nclass _AstToIrVisitor implements cdAst.AstVisitor {\n  private _nodeMap = new Map<cdAst.AST, cdAst.AST>();\n  private _resultMap = new Map<cdAst.AST, o.Expression>();\n  private _currentTemporary: number = 0;\n  public temporaryCount: number = 0;\n  public usesImplicitReceiver: boolean = false;\n\n  constructor(\n      private _localResolver: LocalResolver, private _implicitReceiver: o.Expression,\n      private bindingId: string, private interpolationFunction: InterpolationFunction|undefined,\n      private baseSourceSpan?: ParseSourceSpan) {}\n\n  visitBinary(ast: cdAst.Binary, mode: _Mode): any {\n    let op: o.BinaryOperator;\n    switch (ast.operation) {\n      case '+':\n        op = o.BinaryOperator.Plus;\n        break;\n      case '-':\n        op = o.BinaryOperator.Minus;\n        break;\n      case '*':\n        op = o.BinaryOperator.Multiply;\n        break;\n      case '/':\n        op = o.BinaryOperator.Divide;\n        break;\n      case '%':\n        op = o.BinaryOperator.Modulo;\n        break;\n      case '&&':\n        op = o.BinaryOperator.And;\n        break;\n      case '||':\n        op = o.BinaryOperator.Or;\n        break;\n      case '==':\n        op = o.BinaryOperator.Equals;\n        break;\n      case '!=':\n        op = o.BinaryOperator.NotEquals;\n        break;\n      case '===':\n        op = o.BinaryOperator.Identical;\n        break;\n      case '!==':\n        op = o.BinaryOperator.NotIdentical;\n        break;\n      case '<':\n        op = o.BinaryOperator.Lower;\n        break;\n      case '>':\n        op = o.BinaryOperator.Bigger;\n        break;\n      case '<=':\n        op = o.BinaryOperator.LowerEquals;\n        break;\n      case '>=':\n        op = o.BinaryOperator.BiggerEquals;\n        break;\n      default:\n        throw new Error(`Unsupported operation ${ast.operation}`);\n    }\n\n    return convertToStatementIfNeeded(\n        mode,\n        new o.BinaryOperatorExpr(\n            op, this._visit(ast.left, _Mode.Expression), this._visit(ast.right, _Mode.Expression),\n            undefined, this.convertSourceSpan(ast.span)));\n  }\n\n  visitChain(ast: cdAst.Chain, mode: _Mode): any {\n    ensureStatementMode(mode, ast);\n    return this.visitAll(ast.expressions, mode);\n  }\n\n  visitConditional(ast: cdAst.Conditional, mode: _Mode): any {\n    const value: o.Expression = this._visit(ast.condition, _Mode.Expression);\n    return convertToStatementIfNeeded(\n        mode, value.conditional(\n                  this._visit(ast.trueExp, _Mode.Expression),\n                  this._visit(ast.falseExp, _Mode.Expression), this.convertSourceSpan(ast.span)));\n  }\n\n  visitPipe(ast: cdAst.BindingPipe, mode: _Mode): any {\n    throw new Error(\n        `Illegal state: Pipes should have been converted into functions. Pipe: ${ast.name}`);\n  }\n\n  visitFunctionCall(ast: cdAst.FunctionCall, mode: _Mode): any {\n    const convertedArgs = this.visitAll(ast.args, _Mode.Expression);\n    let fnResult: o.Expression;\n    if (ast instanceof BuiltinFunctionCall) {\n      fnResult = ast.converter(convertedArgs);\n    } else {\n      fnResult = this._visit(ast.target !, _Mode.Expression)\n                     .callFn(convertedArgs, this.convertSourceSpan(ast.span));\n    }\n    return convertToStatementIfNeeded(mode, fnResult);\n  }\n\n  visitImplicitReceiver(ast: cdAst.ImplicitReceiver, mode: _Mode): any {\n    ensureExpressionMode(mode, ast);\n    this.usesImplicitReceiver = true;\n    return this._implicitReceiver;\n  }\n\n  visitInterpolation(ast: cdAst.Interpolation, mode: _Mode): any {\n    ensureExpressionMode(mode, ast);\n    const args = [o.literal(ast.expressions.length)];\n    for (let i = 0; i < ast.strings.length - 1; i++) {\n      args.push(o.literal(ast.strings[i]));\n      args.push(this._visit(ast.expressions[i], _Mode.Expression));\n    }\n    args.push(o.literal(ast.strings[ast.strings.length - 1]));\n\n    if (this.interpolationFunction) {\n      return this.interpolationFunction(args);\n    }\n    return ast.expressions.length <= 9 ?\n        o.importExpr(Identifiers.inlineInterpolate).callFn(args) :\n        o.importExpr(Identifiers.interpolate).callFn([\n          args[0], o.literalArr(args.slice(1), undefined, this.convertSourceSpan(ast.span))\n        ]);\n  }\n\n  visitKeyedRead(ast: cdAst.KeyedRead, mode: _Mode): any {\n    const leftMostSafe = this.leftMostSafeNode(ast);\n    if (leftMostSafe) {\n      return this.convertSafeAccess(ast, leftMostSafe, mode);\n    } else {\n      return convertToStatementIfNeeded(\n          mode, this._visit(ast.obj, _Mode.Expression).key(this._visit(ast.key, _Mode.Expression)));\n    }\n  }\n\n  visitKeyedWrite(ast: cdAst.KeyedWrite, mode: _Mode): any {\n    const obj: o.Expression = this._visit(ast.obj, _Mode.Expression);\n    const key: o.Expression = this._visit(ast.key, _Mode.Expression);\n    const value: o.Expression = this._visit(ast.value, _Mode.Expression);\n    return convertToStatementIfNeeded(mode, obj.key(key).set(value));\n  }\n\n  visitLiteralArray(ast: cdAst.LiteralArray, mode: _Mode): any {\n    throw new Error(`Illegal State: literal arrays should have been converted into functions`);\n  }\n\n  visitLiteralMap(ast: cdAst.LiteralMap, mode: _Mode): any {\n    throw new Error(`Illegal State: literal maps should have been converted into functions`);\n  }\n\n  visitLiteralPrimitive(ast: cdAst.LiteralPrimitive, mode: _Mode): any {\n    // For literal values of null, undefined, true, or false allow type interference\n    // to infer the type.\n    const type =\n        ast.value === null || ast.value === undefined || ast.value === true || ast.value === true ?\n        o.INFERRED_TYPE :\n        undefined;\n    return convertToStatementIfNeeded(\n        mode, o.literal(ast.value, type, this.convertSourceSpan(ast.span)));\n  }\n\n  private _getLocal(name: string): o.Expression|null { return this._localResolver.getLocal(name); }\n\n  visitMethodCall(ast: cdAst.MethodCall, mode: _Mode): any {\n    if (ast.receiver instanceof cdAst.ImplicitReceiver && ast.name == '$any') {\n      const args = this.visitAll(ast.args, _Mode.Expression) as any[];\n      if (args.length != 1) {\n        throw new Error(\n            `Invalid call to $any, expected 1 argument but received ${args.length || 'none'}`);\n      }\n      return (args[0] as o.Expression).cast(o.DYNAMIC_TYPE, this.convertSourceSpan(ast.span));\n    }\n\n    const leftMostSafe = this.leftMostSafeNode(ast);\n    if (leftMostSafe) {\n      return this.convertSafeAccess(ast, leftMostSafe, mode);\n    } else {\n      const args = this.visitAll(ast.args, _Mode.Expression);\n      const prevUsesImplicitReceiver = this.usesImplicitReceiver;\n      let result: any = null;\n      const receiver = this._visit(ast.receiver, _Mode.Expression);\n      if (receiver === this._implicitReceiver) {\n        const varExpr = this._getLocal(ast.name);\n        if (varExpr) {\n          // Restore the previous \"usesImplicitReceiver\" state since the implicit\n          // receiver has been replaced with a resolved local expression.\n          this.usesImplicitReceiver = prevUsesImplicitReceiver;\n          result = varExpr.callFn(args);\n        }\n      }\n      if (result == null) {\n        result = receiver.callMethod(ast.name, args, this.convertSourceSpan(ast.span));\n      }\n      return convertToStatementIfNeeded(mode, result);\n    }\n  }\n\n  visitPrefixNot(ast: cdAst.PrefixNot, mode: _Mode): any {\n    return convertToStatementIfNeeded(mode, o.not(this._visit(ast.expression, _Mode.Expression)));\n  }\n\n  visitNonNullAssert(ast: cdAst.NonNullAssert, mode: _Mode): any {\n    return convertToStatementIfNeeded(\n        mode, o.assertNotNull(this._visit(ast.expression, _Mode.Expression)));\n  }\n\n  visitPropertyRead(ast: cdAst.PropertyRead, mode: _Mode): any {\n    const leftMostSafe = this.leftMostSafeNode(ast);\n    if (leftMostSafe) {\n      return this.convertSafeAccess(ast, leftMostSafe, mode);\n    } else {\n      let result: any = null;\n      const prevUsesImplicitReceiver = this.usesImplicitReceiver;\n      const receiver = this._visit(ast.receiver, _Mode.Expression);\n      if (receiver === this._implicitReceiver) {\n        result = this._getLocal(ast.name);\n        if (result) {\n          // Restore the previous \"usesImplicitReceiver\" state since the implicit\n          // receiver has been replaced with a resolved local expression.\n          this.usesImplicitReceiver = prevUsesImplicitReceiver;\n        }\n      }\n      if (result == null) {\n        result = receiver.prop(ast.name);\n      }\n      return convertToStatementIfNeeded(mode, result);\n    }\n  }\n\n  visitPropertyWrite(ast: cdAst.PropertyWrite, mode: _Mode): any {\n    const receiver: o.Expression = this._visit(ast.receiver, _Mode.Expression);\n    const prevUsesImplicitReceiver = this.usesImplicitReceiver;\n\n    let varExpr: o.ReadPropExpr|null = null;\n    if (receiver === this._implicitReceiver) {\n      const localExpr = this._getLocal(ast.name);\n      if (localExpr) {\n        if (localExpr instanceof o.ReadPropExpr) {\n          // If the local variable is a property read expression, it's a reference\n          // to a 'context.property' value and will be used as the target of the\n          // write expression.\n          varExpr = localExpr;\n          // Restore the previous \"usesImplicitReceiver\" state since the implicit\n          // receiver has been replaced with a resolved local expression.\n          this.usesImplicitReceiver = prevUsesImplicitReceiver;\n        } else {\n          // Otherwise it's an error.\n          throw new Error('Cannot assign to a reference or variable!');\n        }\n      }\n    }\n    // If no local expression could be produced, use the original receiver's\n    // property as the target.\n    if (varExpr === null) {\n      varExpr = receiver.prop(ast.name);\n    }\n    return convertToStatementIfNeeded(mode, varExpr.set(this._visit(ast.value, _Mode.Expression)));\n  }\n\n  visitSafePropertyRead(ast: cdAst.SafePropertyRead, mode: _Mode): any {\n    return this.convertSafeAccess(ast, this.leftMostSafeNode(ast), mode);\n  }\n\n  visitSafeMethodCall(ast: cdAst.SafeMethodCall, mode: _Mode): any {\n    return this.convertSafeAccess(ast, this.leftMostSafeNode(ast), mode);\n  }\n\n  visitAll(asts: cdAst.AST[], mode: _Mode): any { return asts.map(ast => this._visit(ast, mode)); }\n\n  visitQuote(ast: cdAst.Quote, mode: _Mode): any {\n    throw new Error(`Quotes are not supported for evaluation!\n        Statement: ${ast.uninterpretedExpression} located at ${ast.location}`);\n  }\n\n  private _visit(ast: cdAst.AST, mode: _Mode): any {\n    const result = this._resultMap.get(ast);\n    if (result) return result;\n    return (this._nodeMap.get(ast) || ast).visit(this, mode);\n  }\n\n  private convertSafeAccess(\n      ast: cdAst.AST, leftMostSafe: cdAst.SafeMethodCall|cdAst.SafePropertyRead, mode: _Mode): any {\n    // If the expression contains a safe access node on the left it needs to be converted to\n    // an expression that guards the access to the member by checking the receiver for blank. As\n    // execution proceeds from left to right, the left most part of the expression must be guarded\n    // first but, because member access is left associative, the right side of the expression is at\n    // the top of the AST. The desired result requires lifting a copy of the the left part of the\n    // expression up to test it for blank before generating the unguarded version.\n\n    // Consider, for example the following expression: a?.b.c?.d.e\n\n    // This results in the ast:\n    //         .\n    //        / \\\n    //       ?.   e\n    //      /  \\\n    //     .    d\n    //    / \\\n    //   ?.  c\n    //  /  \\\n    // a    b\n\n    // The following tree should be generated:\n    //\n    //        /---- ? ----\\\n    //       /      |      \\\n    //     a   /--- ? ---\\  null\n    //        /     |     \\\n    //       .      .     null\n    //      / \\    / \\\n    //     .  c   .   e\n    //    / \\    / \\\n    //   a   b  .   d\n    //         / \\\n    //        .   c\n    //       / \\\n    //      a   b\n    //\n    // Notice that the first guard condition is the left hand of the left most safe access node\n    // which comes in as leftMostSafe to this routine.\n\n    let guardedExpression = this._visit(leftMostSafe.receiver, _Mode.Expression);\n    let temporary: o.ReadVarExpr = undefined !;\n    if (this.needsTemporary(leftMostSafe.receiver)) {\n      // If the expression has method calls or pipes then we need to save the result into a\n      // temporary variable to avoid calling stateful or impure code more than once.\n      temporary = this.allocateTemporary();\n\n      // Preserve the result in the temporary variable\n      guardedExpression = temporary.set(guardedExpression);\n\n      // Ensure all further references to the guarded expression refer to the temporary instead.\n      this._resultMap.set(leftMostSafe.receiver, temporary);\n    }\n    const condition = guardedExpression.isBlank();\n\n    // Convert the ast to an unguarded access to the receiver's member. The map will substitute\n    // leftMostNode with its unguarded version in the call to `this.visit()`.\n    if (leftMostSafe instanceof cdAst.SafeMethodCall) {\n      this._nodeMap.set(\n          leftMostSafe,\n          new cdAst.MethodCall(\n              leftMostSafe.span, leftMostSafe.receiver, leftMostSafe.name, leftMostSafe.args));\n    } else {\n      this._nodeMap.set(\n          leftMostSafe,\n          new cdAst.PropertyRead(leftMostSafe.span, leftMostSafe.receiver, leftMostSafe.name));\n    }\n\n    // Recursively convert the node now without the guarded member access.\n    const access = this._visit(ast, _Mode.Expression);\n\n    // Remove the mapping. This is not strictly required as the converter only traverses each node\n    // once but is safer if the conversion is changed to traverse the nodes more than once.\n    this._nodeMap.delete(leftMostSafe);\n\n    // If we allocated a temporary, release it.\n    if (temporary) {\n      this.releaseTemporary(temporary);\n    }\n\n    // Produce the conditional\n    return convertToStatementIfNeeded(mode, condition.conditional(o.literal(null), access));\n  }\n\n  // Given a expression of the form a?.b.c?.d.e the the left most safe node is\n  // the (a?.b). The . and ?. are left associative thus can be rewritten as:\n  // ((((a?.c).b).c)?.d).e. This returns the most deeply nested safe read or\n  // safe method call as this needs be transform initially to:\n  //   a == null ? null : a.c.b.c?.d.e\n  // then to:\n  //   a == null ? null : a.b.c == null ? null : a.b.c.d.e\n  private leftMostSafeNode(ast: cdAst.AST): cdAst.SafePropertyRead|cdAst.SafeMethodCall {\n    const visit = (visitor: cdAst.AstVisitor, ast: cdAst.AST): any => {\n      return (this._nodeMap.get(ast) || ast).visit(visitor);\n    };\n    return ast.visit({\n      visitBinary(ast: cdAst.Binary) { return null; },\n      visitChain(ast: cdAst.Chain) { return null; },\n      visitConditional(ast: cdAst.Conditional) { return null; },\n      visitFunctionCall(ast: cdAst.FunctionCall) { return null; },\n      visitImplicitReceiver(ast: cdAst.ImplicitReceiver) { return null; },\n      visitInterpolation(ast: cdAst.Interpolation) { return null; },\n      visitKeyedRead(ast: cdAst.KeyedRead) { return visit(this, ast.obj); },\n      visitKeyedWrite(ast: cdAst.KeyedWrite) { return null; },\n      visitLiteralArray(ast: cdAst.LiteralArray) { return null; },\n      visitLiteralMap(ast: cdAst.LiteralMap) { return null; },\n      visitLiteralPrimitive(ast: cdAst.LiteralPrimitive) { return null; },\n      visitMethodCall(ast: cdAst.MethodCall) { return visit(this, ast.receiver); },\n      visitPipe(ast: cdAst.BindingPipe) { return null; },\n      visitPrefixNot(ast: cdAst.PrefixNot) { return null; },\n      visitNonNullAssert(ast: cdAst.NonNullAssert) { return null; },\n      visitPropertyRead(ast: cdAst.PropertyRead) { return visit(this, ast.receiver); },\n      visitPropertyWrite(ast: cdAst.PropertyWrite) { return null; },\n      visitQuote(ast: cdAst.Quote) { return null; },\n      visitSafeMethodCall(ast: cdAst.SafeMethodCall) { return visit(this, ast.receiver) || ast; },\n      visitSafePropertyRead(ast: cdAst.SafePropertyRead) {\n        return visit(this, ast.receiver) || ast;\n      }\n    });\n  }\n\n  // Returns true of the AST includes a method or a pipe indicating that, if the\n  // expression is used as the target of a safe property or method access then\n  // the expression should be stored into a temporary variable.\n  private needsTemporary(ast: cdAst.AST): boolean {\n    const visit = (visitor: cdAst.AstVisitor, ast: cdAst.AST): boolean => {\n      return ast && (this._nodeMap.get(ast) || ast).visit(visitor);\n    };\n    const visitSome = (visitor: cdAst.AstVisitor, ast: cdAst.AST[]): boolean => {\n      return ast.some(ast => visit(visitor, ast));\n    };\n    return ast.visit({\n      visitBinary(ast: cdAst.Binary):\n          boolean{return visit(this, ast.left) || visit(this, ast.right);},\n      visitChain(ast: cdAst.Chain) { return false; },\n      visitConditional(ast: cdAst.Conditional):\n          boolean{return visit(this, ast.condition) || visit(this, ast.trueExp) ||\n                      visit(this, ast.falseExp);},\n      visitFunctionCall(ast: cdAst.FunctionCall) { return true; },\n      visitImplicitReceiver(ast: cdAst.ImplicitReceiver) { return false; },\n      visitInterpolation(ast: cdAst.Interpolation) { return visitSome(this, ast.expressions); },\n      visitKeyedRead(ast: cdAst.KeyedRead) { return false; },\n      visitKeyedWrite(ast: cdAst.KeyedWrite) { return false; },\n      visitLiteralArray(ast: cdAst.LiteralArray) { return true; },\n      visitLiteralMap(ast: cdAst.LiteralMap) { return true; },\n      visitLiteralPrimitive(ast: cdAst.LiteralPrimitive) { return false; },\n      visitMethodCall(ast: cdAst.MethodCall) { return true; },\n      visitPipe(ast: cdAst.BindingPipe) { return true; },\n      visitPrefixNot(ast: cdAst.PrefixNot) { return visit(this, ast.expression); },\n      visitNonNullAssert(ast: cdAst.PrefixNot) { return visit(this, ast.expression); },\n      visitPropertyRead(ast: cdAst.PropertyRead) { return false; },\n      visitPropertyWrite(ast: cdAst.PropertyWrite) { return false; },\n      visitQuote(ast: cdAst.Quote) { return false; },\n      visitSafeMethodCall(ast: cdAst.SafeMethodCall) { return true; },\n      visitSafePropertyRead(ast: cdAst.SafePropertyRead) { return false; }\n    });\n  }\n\n  private allocateTemporary(): o.ReadVarExpr {\n    const tempNumber = this._currentTemporary++;\n    this.temporaryCount = Math.max(this._currentTemporary, this.temporaryCount);\n    return new o.ReadVarExpr(temporaryName(this.bindingId, tempNumber));\n  }\n\n  private releaseTemporary(temporary: o.ReadVarExpr) {\n    this._currentTemporary--;\n    if (temporary.name != temporaryName(this.bindingId, this._currentTemporary)) {\n      throw new Error(`Temporary ${temporary.name} released out of order`);\n    }\n  }\n\n  /**\n   * Creates an absolute `ParseSourceSpan` from the relative `ParseSpan`.\n   *\n   * `ParseSpan` objects are relative to the start of the expression.\n   * This method converts these to full `ParseSourceSpan` objects that\n   * show where the span is within the overall source file.\n   *\n   * @param span the relative span to convert.\n   * @returns a `ParseSourceSpan` for the the given span or null if no\n   * `baseSourceSpan` was provided to this class.\n   */\n  private convertSourceSpan(span: cdAst.ParseSpan) {\n    if (this.baseSourceSpan) {\n      const start = this.baseSourceSpan.start.moveBy(span.start);\n      const end = this.baseSourceSpan.start.moveBy(span.end);\n      return new ParseSourceSpan(start, end);\n    } else {\n      return null;\n    }\n  }\n}\n\nfunction flattenStatements(arg: any, output: o.Statement[]) {\n  if (Array.isArray(arg)) {\n    (<any[]>arg).forEach((entry) => flattenStatements(entry, output));\n  } else {\n    output.push(arg);\n  }\n}\n\nclass DefaultLocalResolver implements LocalResolver {\n  notifyImplicitReceiverUse(): void {}\n  getLocal(name: string): o.Expression|null {\n    if (name === EventHandlerVars.event.name) {\n      return EventHandlerVars.event;\n    }\n    return null;\n  }\n}\n\nfunction createCurrValueExpr(bindingId: string): o.ReadVarExpr {\n  return o.variable(`currVal_${bindingId}`);  // fix syntax highlighting: `\n}\n\nfunction createPreventDefaultVar(bindingId: string): o.ReadVarExpr {\n  return o.variable(`pd_${bindingId}`);\n}\n\nfunction convertStmtIntoExpression(stmt: o.Statement): o.Expression|null {\n  if (stmt instanceof o.ExpressionStatement) {\n    return stmt.expr;\n  } else if (stmt instanceof o.ReturnStatement) {\n    return stmt.value;\n  }\n  return null;\n}\n\nexport class BuiltinFunctionCall extends cdAst.FunctionCall {\n  constructor(span: cdAst.ParseSpan, public args: cdAst.AST[], public converter: BuiltinConverter) {\n    super(span, null, args);\n  }\n}\n"]}