angular2/src/core/change_detection/parser/parser.js

Angular 2 - a web framework for modern web apps

'use strict';var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") return Reflect.decorate(decorators, target, key, desc);
    switch (arguments.length) {
        case 2: return decorators.reduceRight(function(o, d) { return (d && d(o)) || o; }, target);
        case 3: return decorators.reduceRight(function(o, d) { return (d && d(target, key)), void 0; }, void 0);
        case 4: return decorators.reduceRight(function(o, d) { return (d && d(target, key, o)) || o; }, desc);
    }
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var decorators_1 = require('angular2/src/core/di/decorators');
var lang_1 = require('angular2/src/facade/lang');
var exceptions_1 = require('angular2/src/facade/exceptions');
var collection_1 = require('angular2/src/facade/collection');
var lexer_1 = require('./lexer');
var reflection_1 = require('angular2/src/core/reflection/reflection');
var ast_1 = require('./ast');
var _implicitReceiver = new ast_1.ImplicitReceiver();
// TODO(tbosch): Cannot make this const/final right now because of the transpiler...
var INTERPOLATION_REGEXP = /\{\{(.*?)\}\}/g;
var ParseException = (function (_super) {
    __extends(ParseException, _super);
    function ParseException(message, input, errLocation, ctxLocation) {
        _super.call(this, "Parser Error: " + message + " " + errLocation + " [" + input + "] in " + ctxLocation);
    }
    return ParseException;
})(exceptions_1.BaseException);
var Parser = (function () {
    function Parser(/** @internal */ _lexer, providedReflector) {
        if (providedReflector === void 0) { providedReflector = null; }
        this._lexer = _lexer;
        this._reflector = lang_1.isPresent(providedReflector) ? providedReflector : reflection_1.reflector;
    }
    Parser.prototype.parseAction = function (input, location) {
        this._checkNoInterpolation(input, location);
        var tokens = this._lexer.tokenize(input);
        var ast = new _ParseAST(input, location, tokens, this._reflector, true).parseChain();
        return new ast_1.ASTWithSource(ast, input, location);
    };
    Parser.prototype.parseBinding = function (input, location) {
        this._checkNoInterpolation(input, location);
        var tokens = this._lexer.tokenize(input);
        var ast = new _ParseAST(input, location, tokens, this._reflector, false).parseChain();
        return new ast_1.ASTWithSource(ast, input, location);
    };
    Parser.prototype.parseSimpleBinding = function (input, location) {
        this._checkNoInterpolation(input, location);
        var tokens = this._lexer.tokenize(input);
        var ast = new _ParseAST(input, location, tokens, this._reflector, false).parseSimpleBinding();
        return new ast_1.ASTWithSource(ast, input, location);
    };
    Parser.prototype.parseTemplateBindings = function (input, location) {
        var tokens = this._lexer.tokenize(input);
        return new _ParseAST(input, location, tokens, this._reflector, false).parseTemplateBindings();
    };
    Parser.prototype.parseInterpolation = function (input, location) {
        var parts = lang_1.StringWrapper.split(input, INTERPOLATION_REGEXP);
        if (parts.length <= 1) {
            return null;
        }
        var strings = [];
        var expressions = [];
        for (var i = 0; i < parts.length; i++) {
            var part = parts[i];
            if (i % 2 === 0) {
                // fixed string
                strings.push(part);
            }
            else if (part.trim().length > 0) {
                var tokens = this._lexer.tokenize(part);
                var ast = new _ParseAST(input, location, tokens, this._reflector, false).parseChain();
                expressions.push(ast);
            }
            else {
                throw new ParseException('Blank expressions are not allowed in interpolated strings', input, "at column " + this._findInterpolationErrorColumn(parts, i) + " in", location);
            }
        }
        return new ast_1.ASTWithSource(new ast_1.Interpolation(strings, expressions), input, location);
    };
    Parser.prototype.wrapLiteralPrimitive = function (input, location) {
        return new ast_1.ASTWithSource(new ast_1.LiteralPrimitive(input), input, location);
    };
    Parser.prototype._checkNoInterpolation = function (input, location) {
        var parts = lang_1.StringWrapper.split(input, INTERPOLATION_REGEXP);
        if (parts.length > 1) {
            throw new ParseException('Got interpolation ({{}}) where expression was expected', input, "at column " + this._findInterpolationErrorColumn(parts, 1) + " in", location);
        }
    };
    Parser.prototype._findInterpolationErrorColumn = function (parts, partInErrIdx) {
        var errLocation = '';
        for (var j = 0; j < partInErrIdx; j++) {
            errLocation += j % 2 === 0 ? parts[j] : "{{" + parts[j] + "}}";
        }
        return errLocation.length;
    };
    Parser = __decorate([
        decorators_1.Injectable(), 
        __metadata('design:paramtypes', [lexer_1.Lexer, reflection_1.Reflector])
    ], Parser);
    return Parser;
})();
exports.Parser = Parser;
var _ParseAST = (function () {
    function _ParseAST(input, location, tokens, reflector, parseAction) {
        this.input = input;
        this.location = location;
        this.tokens = tokens;
        this.reflector = reflector;
        this.parseAction = parseAction;
        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: true,
        configurable: true
    });
    Object.defineProperty(_ParseAST.prototype, "inputIndex", {
        get: function () {
            return (this.index < this.tokens.length) ? this.next.index : this.input.length;
        },
        enumerable: true,
        configurable: true
    });
    _ParseAST.prototype.advance = function () { this.index++; };
    _ParseAST.prototype.optionalCharacter = function (code) {
        if (this.next.isCharacter(code)) {
            this.advance();
            return true;
        }
        else {
            return false;
        }
    };
    _ParseAST.prototype.optionalKeywordVar = function () {
        if (this.peekKeywordVar()) {
            this.advance();
            return true;
        }
        else {
            return false;
        }
    };
    _ParseAST.prototype.peekKeywordVar = function () { return this.next.isKeywordVar() || this.next.isOperator('#'); };
    _ParseAST.prototype.expectCharacter = function (code) {
        if (this.optionalCharacter(code))
            return;
        this.error("Missing expected " + lang_1.StringWrapper.fromCharCode(code));
    };
    _ParseAST.prototype.optionalOperator = function (op) {
        if (this.next.isOperator(op)) {
            this.advance();
            return true;
        }
        else {
            return false;
        }
    };
    _ParseAST.prototype.expectOperator = function (operator) {
        if (this.optionalOperator(operator))
            return;
        this.error("Missing expected operator " + operator);
    };
    _ParseAST.prototype.expectIdentifierOrKeyword = function () {
        var n = this.next;
        if (!n.isIdentifier() && !n.isKeyword()) {
            this.error("Unexpected token " + n + ", expected identifier or keyword");
        }
        this.advance();
        return n.toString();
    };
    _ParseAST.prototype.expectIdentifierOrKeywordOrString = function () {
        var n = this.next;
        if (!n.isIdentifier() && !n.isKeyword() && !n.isString()) {
            this.error("Unexpected token " + n + ", expected identifier, keyword, or string");
        }
        this.advance();
        return n.toString();
    };
    _ParseAST.prototype.parseSimpleBinding = function () {
        var ast = this.parseChain();
        if (!SimpleExpressionChecker.check(ast)) {
            this.error("Simple binding expression can only contain field access and constants'");
        }
        return ast;
    };
    _ParseAST.prototype.parseChain = function () {
        var exprs = [];
        while (this.index < this.tokens.length) {
            var expr = this.parsePipe();
            exprs.push(expr);
            if (this.optionalCharacter(lexer_1.$SEMICOLON)) {
                if (!this.parseAction) {
                    this.error("Binding expression cannot contain chained expression");
                }
                while (this.optionalCharacter(lexer_1.$SEMICOLON)) {
                } // read all semicolons
            }
            else if (this.index < this.tokens.length) {
                this.error("Unexpected token '" + this.next + "'");
            }
        }
        if (exprs.length == 0)
            return new ast_1.EmptyExpr();
        if (exprs.length == 1)
            return exprs[0];
        return new ast_1.Chain(exprs);
    };
    _ParseAST.prototype.parsePipe = function () {
        var result = this.parseExpression();
        if (this.optionalOperator("|")) {
            if (this.parseAction) {
                this.error("Cannot have a pipe in an action expression");
            }
            do {
                var name = this.expectIdentifierOrKeyword();
                var args = [];
                while (this.optionalCharacter(lexer_1.$COLON)) {
                    args.push(this.parseExpression());
                }
                result = new ast_1.BindingPipe(result, name, args);
            } while (this.optionalOperator("|"));
        }
        return result;
    };
    _ParseAST.prototype.parseExpression = function () { return this.parseConditional(); };
    _ParseAST.prototype.parseConditional = function () {
        var start = this.inputIndex;
        var result = this.parseLogicalOr();
        if (this.optionalOperator('?')) {
            var yes = this.parsePipe();
            if (!this.optionalCharacter(lexer_1.$COLON)) {
                var end = this.inputIndex;
                var expression = this.input.substring(start, end);
                this.error("Conditional expression " + expression + " requires all 3 expressions");
            }
            var no = this.parsePipe();
            return new ast_1.Conditional(result, yes, no);
        }
        else {
            return result;
        }
    };
    _ParseAST.prototype.parseLogicalOr = function () {
        // '||'
        var result = this.parseLogicalAnd();
        while (this.optionalOperator('||')) {
            result = new ast_1.Binary('||', result, this.parseLogicalAnd());
        }
        return result;
    };
    _ParseAST.prototype.parseLogicalAnd = function () {
        // '&&'
        var result = this.parseEquality();
        while (this.optionalOperator('&&')) {
            result = new ast_1.Binary('&&', result, this.parseEquality());
        }
        return result;
    };
    _ParseAST.prototype.parseEquality = function () {
        // '==','!=','===','!=='
        var result = this.parseRelational();
        while (true) {
            if (this.optionalOperator('==')) {
                result = new ast_1.Binary('==', result, this.parseRelational());
            }
            else if (this.optionalOperator('===')) {
                result = new ast_1.Binary('===', result, this.parseRelational());
            }
            else if (this.optionalOperator('!=')) {
                result = new ast_1.Binary('!=', result, this.parseRelational());
            }
            else if (this.optionalOperator('!==')) {
                result = new ast_1.Binary('!==', result, this.parseRelational());
            }
            else {
                return result;
            }
        }
    };
    _ParseAST.prototype.parseRelational = function () {
        // '<', '>', '<=', '>='
        var result = this.parseAdditive();
        while (true) {
            if (this.optionalOperator('<')) {
                result = new ast_1.Binary('<', result, this.parseAdditive());
            }
            else if (this.optionalOperator('>')) {
                result = new ast_1.Binary('>', result, this.parseAdditive());
            }
            else if (this.optionalOperator('<=')) {
                result = new ast_1.Binary('<=', result, this.parseAdditive());
            }
            else if (this.optionalOperator('>=')) {
                result = new ast_1.Binary('>=', result, this.parseAdditive());
            }
            else {
                return result;
            }
        }
    };
    _ParseAST.prototype.parseAdditive = function () {
        // '+', '-'
        var result = this.parseMultiplicative();
        while (true) {
            if (this.optionalOperator('+')) {
                result = new ast_1.Binary('+', result, this.parseMultiplicative());
            }
            else if (this.optionalOperator('-')) {
                result = new ast_1.Binary('-', result, this.parseMultiplicative());
            }
            else {
                return result;
            }
        }
    };
    _ParseAST.prototype.parseMultiplicative = function () {
        // '*', '%', '/'
        var result = this.parsePrefix();
        while (true) {
            if (this.optionalOperator('*')) {
                result = new ast_1.Binary('*', result, this.parsePrefix());
            }
            else if (this.optionalOperator('%')) {
                result = new ast_1.Binary('%', result, this.parsePrefix());
            }
            else if (this.optionalOperator('/')) {
                result = new ast_1.Binary('/', result, this.parsePrefix());
            }
            else {
                return result;
            }
        }
    };
    _ParseAST.prototype.parsePrefix = function () {
        if (this.optionalOperator('+')) {
            return this.parsePrefix();
        }
        else if (this.optionalOperator('-')) {
            return new ast_1.Binary('-', new ast_1.LiteralPrimitive(0), this.parsePrefix());
        }
        else if (this.optionalOperator('!')) {
            return new ast_1.PrefixNot(this.parsePrefix());
        }
        else {
            return this.parseCallChain();
        }
    };
    _ParseAST.prototype.parseCallChain = function () {
        var result = this.parsePrimary();
        while (true) {
            if (this.optionalCharacter(lexer_1.$PERIOD)) {
                result = this.parseAccessMemberOrMethodCall(result, false);
            }
            else if (this.optionalOperator('?.')) {
                result = this.parseAccessMemberOrMethodCall(result, true);
            }
            else if (this.optionalCharacter(lexer_1.$LBRACKET)) {
                var key = this.parsePipe();
                this.expectCharacter(lexer_1.$RBRACKET);
                if (this.optionalOperator("=")) {
                    var value = this.parseConditional();
                    result = new ast_1.KeyedWrite(result, key, value);
                }
                else {
                    result = new ast_1.KeyedRead(result, key);
                }
            }
            else if (this.optionalCharacter(lexer_1.$LPAREN)) {
                var args = this.parseCallArguments();
                this.expectCharacter(lexer_1.$RPAREN);
                result = new ast_1.FunctionCall(result, args);
            }
            else {
                return result;
            }
        }
    };
    _ParseAST.prototype.parsePrimary = function () {
        if (this.optionalCharacter(lexer_1.$LPAREN)) {
            var result = this.parsePipe();
            this.expectCharacter(lexer_1.$RPAREN);
            return result;
        }
        else if (this.next.isKeywordNull() || this.next.isKeywordUndefined()) {
            this.advance();
            return new ast_1.LiteralPrimitive(null);
        }
        else if (this.next.isKeywordTrue()) {
            this.advance();
            return new ast_1.LiteralPrimitive(true);
        }
        else if (this.next.isKeywordFalse()) {
            this.advance();
            return new ast_1.LiteralPrimitive(false);
        }
        else if (this.optionalCharacter(lexer_1.$LBRACKET)) {
            var elements = this.parseExpressionList(lexer_1.$RBRACKET);
            this.expectCharacter(lexer_1.$RBRACKET);
            return new ast_1.LiteralArray(elements);
        }
        else if (this.next.isCharacter(lexer_1.$LBRACE)) {
            return this.parseLiteralMap();
        }
        else if (this.next.isIdentifier()) {
            return this.parseAccessMemberOrMethodCall(_implicitReceiver, false);
        }
        else if (this.next.isNumber()) {
            var value = this.next.toNumber();
            this.advance();
            return new ast_1.LiteralPrimitive(value);
        }
        else if (this.next.isString()) {
            var literalValue = this.next.toString();
            this.advance();
            return new ast_1.LiteralPrimitive(literalValue);
        }
        else if (this.index >= this.tokens.length) {
            this.error("Unexpected end of expression: " + this.input);
        }
        else {
            this.error("Unexpected token " + this.next);
        }
        // error() throws, so we don't reach here.
        throw new exceptions_1.BaseException("Fell through all cases in parsePrimary");
    };
    _ParseAST.prototype.parseExpressionList = function (terminator) {
        var result = [];
        if (!this.next.isCharacter(terminator)) {
            do {
                result.push(this.parsePipe());
            } while (this.optionalCharacter(lexer_1.$COMMA));
        }
        return result;
    };
    _ParseAST.prototype.parseLiteralMap = function () {
        var keys = [];
        var values = [];
        this.expectCharacter(lexer_1.$LBRACE);
        if (!this.optionalCharacter(lexer_1.$RBRACE)) {
            do {
                var key = this.expectIdentifierOrKeywordOrString();
                keys.push(key);
                this.expectCharacter(lexer_1.$COLON);
                values.push(this.parsePipe());
            } while (this.optionalCharacter(lexer_1.$COMMA));
            this.expectCharacter(lexer_1.$RBRACE);
        }
        return new ast_1.LiteralMap(keys, values);
    };
    _ParseAST.prototype.parseAccessMemberOrMethodCall = function (receiver, isSafe) {
        if (isSafe === void 0) { isSafe = false; }
        var id = this.expectIdentifierOrKeyword();
        if (this.optionalCharacter(lexer_1.$LPAREN)) {
            var args = this.parseCallArguments();
            this.expectCharacter(lexer_1.$RPAREN);
            var fn = this.reflector.method(id);
            return isSafe ? new ast_1.SafeMethodCall(receiver, id, fn, args) :
                new ast_1.MethodCall(receiver, id, fn, args);
        }
        else {
            if (isSafe) {
                if (this.optionalOperator("=")) {
                    this.error("The '?.' operator cannot be used in the assignment");
                }
                else {
                    return new ast_1.SafePropertyRead(receiver, id, this.reflector.getter(id));
                }
            }
            else {
                if (this.optionalOperator("=")) {
                    if (!this.parseAction) {
                        this.error("Bindings cannot contain assignments");
                    }
                    var value = this.parseConditional();
                    return new ast_1.PropertyWrite(receiver, id, this.reflector.setter(id), value);
                }
                else {
                    return new ast_1.PropertyRead(receiver, id, this.reflector.getter(id));
                }
            }
        }
        return null;
    };
    _ParseAST.prototype.parseCallArguments = function () {
        if (this.next.isCharacter(lexer_1.$RPAREN))
            return [];
        var positionals = [];
        do {
            positionals.push(this.parsePipe());
        } while (this.optionalCharacter(lexer_1.$COMMA));
        return positionals;
    };
    _ParseAST.prototype.parseBlockContent = function () {
        if (!this.parseAction) {
            this.error("Binding expression cannot contain chained expression");
        }
        var exprs = [];
        while (this.index < this.tokens.length && !this.next.isCharacter(lexer_1.$RBRACE)) {
            var expr = this.parseExpression();
            exprs.push(expr);
            if (this.optionalCharacter(lexer_1.$SEMICOLON)) {
                while (this.optionalCharacter(lexer_1.$SEMICOLON)) {
                } // read all semicolons
            }
        }
        if (exprs.length == 0)
            return new ast_1.EmptyExpr();
        if (exprs.length == 1)
            return exprs[0];
        return new ast_1.Chain(exprs);
    };
    /**
     * An identifier, a keyword, a string with an optional `-` inbetween.
     */
    _ParseAST.prototype.expectTemplateBindingKey = function () {
        var result = '';
        var operatorFound = false;
        do {
            result += this.expectIdentifierOrKeywordOrString();
            operatorFound = this.optionalOperator('-');
            if (operatorFound) {
                result += '-';
            }
        } while (operatorFound);
        return result.toString();
    };
    _ParseAST.prototype.parseTemplateBindings = function () {
        var bindings = [];
        var prefix = null;
        while (this.index < this.tokens.length) {
            var keyIsVar = this.optionalKeywordVar();
            var key = this.expectTemplateBindingKey();
            if (!keyIsVar) {
                if (prefix == null) {
                    prefix = key;
                }
                else {
                    key = prefix + '-' + key;
                }
            }
            this.optionalCharacter(lexer_1.$COLON);
            var name = null;
            var expression = null;
            if (keyIsVar) {
                if (this.optionalOperator("=")) {
                    name = this.expectTemplateBindingKey();
                }
                else {
                    name = '\$implicit';
                }
            }
            else if (this.next !== lexer_1.EOF && !this.peekKeywordVar()) {
                var start = this.inputIndex;
                var ast = this.parsePipe();
                var source = this.input.substring(start, this.inputIndex);
                expression = new ast_1.ASTWithSource(ast, source, this.location);
            }
            bindings.push(new ast_1.TemplateBinding(key, keyIsVar, name, expression));
            if (!this.optionalCharacter(lexer_1.$SEMICOLON)) {
                this.optionalCharacter(lexer_1.$COMMA);
            }
        }
        return bindings;
    };
    _ParseAST.prototype.error = function (message, index) {
        if (index === void 0) { index = null; }
        if (lang_1.isBlank(index))
            index = this.index;
        var location = (index < this.tokens.length) ? "at column " + (this.tokens[index].index + 1) + " in" :
            "at the end of the expression";
        throw new ParseException(message, this.input, location, this.location);
    };
    return _ParseAST;
})();
exports._ParseAST = _ParseAST;
var SimpleExpressionChecker = (function () {
    function SimpleExpressionChecker() {
        this.simple = true;
    }
    SimpleExpressionChecker.check = function (ast) {
        var s = new SimpleExpressionChecker();
        ast.visit(s);
        return s.simple;
    };
    SimpleExpressionChecker.prototype.visitImplicitReceiver = function (ast) { };
    SimpleExpressionChecker.prototype.visitInterpolation = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitLiteralPrimitive = function (ast) { };
    SimpleExpressionChecker.prototype.visitPropertyRead = function (ast) { };
    SimpleExpressionChecker.prototype.visitPropertyWrite = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitSafePropertyRead = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitMethodCall = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitSafeMethodCall = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitFunctionCall = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitLiteralArray = function (ast) { this.visitAll(ast.expressions); };
    SimpleExpressionChecker.prototype.visitLiteralMap = function (ast) { this.visitAll(ast.values); };
    SimpleExpressionChecker.prototype.visitBinary = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitPrefixNot = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitConditional = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitPipe = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitKeyedRead = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitKeyedWrite = function (ast) { this.simple = false; };
    SimpleExpressionChecker.prototype.visitAll = function (asts) {
        var res = collection_1.ListWrapper.createFixedSize(asts.length);
        for (var i = 0; i < asts.length; ++i) {
            res[i] = asts[i].visit(this);
        }
        return res;
    };
    SimpleExpressionChecker.prototype.visitChain = function (ast) { this.simple = false; };
    return SimpleExpressionChecker;
})();
//# sourceMappingURL=parser.js.map