angular2
Version:
Angular 2 - a web framework for modern web apps
656 lines (655 loc) • 25.8 kB
JavaScript
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
import { Injectable } from 'angular2/src/core/di/decorators';
import { isBlank, isPresent, StringWrapper } from 'angular2/src/facade/lang';
import { BaseException } from 'angular2/src/facade/exceptions';
import { ListWrapper } from 'angular2/src/facade/collection';
import { Lexer, EOF, isIdentifier, isQuote, $PERIOD, $COLON, $SEMICOLON, $LBRACKET, $RBRACKET, $COMMA, $LBRACE, $RBRACE, $LPAREN, $RPAREN, $SLASH } from './lexer';
import { EmptyExpr, ImplicitReceiver, PropertyRead, PropertyWrite, SafePropertyRead, LiteralPrimitive, Binary, PrefixNot, Conditional, BindingPipe, Chain, KeyedRead, KeyedWrite, LiteralArray, LiteralMap, Interpolation, MethodCall, SafeMethodCall, FunctionCall, TemplateBinding, ASTWithSource, Quote } from './ast';
var _implicitReceiver = new ImplicitReceiver();
// TODO(tbosch): Cannot make this const/final right now because of the transpiler...
var INTERPOLATION_REGEXP = /\{\{([\s\S]*?)\}\}/g;
class ParseException extends BaseException {
constructor(message, input, errLocation, ctxLocation) {
super(`Parser Error: ${message} ${errLocation} [${input}] in ${ctxLocation}`);
}
}
export class SplitInterpolation {
constructor(strings, expressions) {
this.strings = strings;
this.expressions = expressions;
}
}
export class TemplateBindingParseResult {
constructor(templateBindings, warnings) {
this.templateBindings = templateBindings;
this.warnings = warnings;
}
}
export let Parser = class Parser {
constructor(/** @internal */ _lexer) {
this._lexer = _lexer;
}
parseAction(input, location) {
this._checkNoInterpolation(input, location);
var tokens = this._lexer.tokenize(this._stripComments(input));
var ast = new _ParseAST(input, location, tokens, true).parseChain();
return new ASTWithSource(ast, input, location);
}
parseBinding(input, location) {
var ast = this._parseBindingAst(input, location);
return new ASTWithSource(ast, input, location);
}
parseSimpleBinding(input, location) {
var ast = this._parseBindingAst(input, location);
if (!SimpleExpressionChecker.check(ast)) {
throw new ParseException('Host binding expression can only contain field access and constants', input, location);
}
return new ASTWithSource(ast, input, location);
}
_parseBindingAst(input, location) {
// Quotes expressions use 3rd-party expression language. We don't want to use
// our lexer or parser for that, so we check for that ahead of time.
var quote = this._parseQuote(input, location);
if (isPresent(quote)) {
return quote;
}
this._checkNoInterpolation(input, location);
var tokens = this._lexer.tokenize(this._stripComments(input));
return new _ParseAST(input, location, tokens, false).parseChain();
}
_parseQuote(input, location) {
if (isBlank(input))
return null;
var prefixSeparatorIndex = input.indexOf(':');
if (prefixSeparatorIndex == -1)
return null;
var prefix = input.substring(0, prefixSeparatorIndex).trim();
if (!isIdentifier(prefix))
return null;
var uninterpretedExpression = input.substring(prefixSeparatorIndex + 1);
return new Quote(prefix, uninterpretedExpression, location);
}
parseTemplateBindings(input, location) {
var tokens = this._lexer.tokenize(input);
return new _ParseAST(input, location, tokens, false).parseTemplateBindings();
}
parseInterpolation(input, location) {
let split = this.splitInterpolation(input, location);
if (split == null)
return null;
let expressions = [];
for (let i = 0; i < split.expressions.length; ++i) {
var tokens = this._lexer.tokenize(this._stripComments(split.expressions[i]));
var ast = new _ParseAST(input, location, tokens, false).parseChain();
expressions.push(ast);
}
return new ASTWithSource(new Interpolation(split.strings, expressions), input, location);
}
splitInterpolation(input, location) {
var parts = 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) {
expressions.push(part);
}
else {
throw new ParseException('Blank expressions are not allowed in interpolated strings', input, `at column ${this._findInterpolationErrorColumn(parts, i)} in`, location);
}
}
return new SplitInterpolation(strings, expressions);
}
wrapLiteralPrimitive(input, location) {
return new ASTWithSource(new LiteralPrimitive(input), input, location);
}
_stripComments(input) {
let i = this._commentStart(input);
return isPresent(i) ? input.substring(0, i).trim() : input;
}
_commentStart(input) {
var outerQuote = null;
for (var i = 0; i < input.length - 1; i++) {
let char = StringWrapper.charCodeAt(input, i);
let nextChar = StringWrapper.charCodeAt(input, i + 1);
if (char === $SLASH && nextChar == $SLASH && isBlank(outerQuote))
return i;
if (outerQuote === char) {
outerQuote = null;
}
else if (isBlank(outerQuote) && isQuote(char)) {
outerQuote = char;
}
}
return null;
}
_checkNoInterpolation(input, location) {
var parts = StringWrapper.split(input, INTERPOLATION_REGEXP);
if (parts.length > 1) {
throw new ParseException('Got interpolation ({{}}) where expression was expected', input, `at column ${this._findInterpolationErrorColumn(parts, 1)} in`, location);
}
}
_findInterpolationErrorColumn(parts, partInErrIdx) {
var errLocation = '';
for (var j = 0; j < partInErrIdx; j++) {
errLocation += j % 2 === 0 ? parts[j] : `{{${parts[j]}}}`;
}
return errLocation.length;
}
};
Parser = __decorate([
Injectable(),
__metadata('design:paramtypes', [Lexer])
], Parser);
export class _ParseAST {
constructor(input, location, tokens, parseAction) {
this.input = input;
this.location = location;
this.tokens = tokens;
this.parseAction = parseAction;
this.index = 0;
}
peek(offset) {
var i = this.index + offset;
return i < this.tokens.length ? this.tokens[i] : EOF;
}
get next() { return this.peek(0); }
get inputIndex() {
return (this.index < this.tokens.length) ? this.next.index : this.input.length;
}
advance() { this.index++; }
optionalCharacter(code) {
if (this.next.isCharacter(code)) {
this.advance();
return true;
}
else {
return false;
}
}
peekKeywordLet() { return this.next.isKeywordLet(); }
peekDeprecatedKeywordVar() { return this.next.isKeywordDeprecatedVar(); }
peekDeprecatedOperatorHash() { return this.next.isOperator('#'); }
expectCharacter(code) {
if (this.optionalCharacter(code))
return;
this.error(`Missing expected ${StringWrapper.fromCharCode(code)}`);
}
optionalOperator(op) {
if (this.next.isOperator(op)) {
this.advance();
return true;
}
else {
return false;
}
}
expectOperator(operator) {
if (this.optionalOperator(operator))
return;
this.error(`Missing expected operator ${operator}`);
}
expectIdentifierOrKeyword() {
var n = this.next;
if (!n.isIdentifier() && !n.isKeyword()) {
this.error(`Unexpected token ${n}, expected identifier or keyword`);
}
this.advance();
return n.toString();
}
expectIdentifierOrKeywordOrString() {
var n = this.next;
if (!n.isIdentifier() && !n.isKeyword() && !n.isString()) {
this.error(`Unexpected token ${n}, expected identifier, keyword, or string`);
}
this.advance();
return n.toString();
}
parseChain() {
var exprs = [];
while (this.index < this.tokens.length) {
var expr = this.parsePipe();
exprs.push(expr);
if (this.optionalCharacter($SEMICOLON)) {
if (!this.parseAction) {
this.error("Binding expression cannot contain chained expression");
}
while (this.optionalCharacter($SEMICOLON)) {
} // read all semicolons
}
else if (this.index < this.tokens.length) {
this.error(`Unexpected token '${this.next}'`);
}
}
if (exprs.length == 0)
return new EmptyExpr();
if (exprs.length == 1)
return exprs[0];
return new Chain(exprs);
}
parsePipe() {
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($COLON)) {
args.push(this.parseExpression());
}
result = new BindingPipe(result, name, args);
} while (this.optionalOperator("|"));
}
return result;
}
parseExpression() { return this.parseConditional(); }
parseConditional() {
var start = this.inputIndex;
var result = this.parseLogicalOr();
if (this.optionalOperator('?')) {
var yes = this.parsePipe();
if (!this.optionalCharacter($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 Conditional(result, yes, no);
}
else {
return result;
}
}
parseLogicalOr() {
// '||'
var result = this.parseLogicalAnd();
while (this.optionalOperator('||')) {
result = new Binary('||', result, this.parseLogicalAnd());
}
return result;
}
parseLogicalAnd() {
// '&&'
var result = this.parseEquality();
while (this.optionalOperator('&&')) {
result = new Binary('&&', result, this.parseEquality());
}
return result;
}
parseEquality() {
// '==','!=','===','!=='
var result = this.parseRelational();
while (true) {
if (this.optionalOperator('==')) {
result = new Binary('==', result, this.parseRelational());
}
else if (this.optionalOperator('===')) {
result = new Binary('===', result, this.parseRelational());
}
else if (this.optionalOperator('!=')) {
result = new Binary('!=', result, this.parseRelational());
}
else if (this.optionalOperator('!==')) {
result = new Binary('!==', result, this.parseRelational());
}
else {
return result;
}
}
}
parseRelational() {
// '<', '>', '<=', '>='
var result = this.parseAdditive();
while (true) {
if (this.optionalOperator('<')) {
result = new Binary('<', result, this.parseAdditive());
}
else if (this.optionalOperator('>')) {
result = new Binary('>', result, this.parseAdditive());
}
else if (this.optionalOperator('<=')) {
result = new Binary('<=', result, this.parseAdditive());
}
else if (this.optionalOperator('>=')) {
result = new Binary('>=', result, this.parseAdditive());
}
else {
return result;
}
}
}
parseAdditive() {
// '+', '-'
var result = this.parseMultiplicative();
while (true) {
if (this.optionalOperator('+')) {
result = new Binary('+', result, this.parseMultiplicative());
}
else if (this.optionalOperator('-')) {
result = new Binary('-', result, this.parseMultiplicative());
}
else {
return result;
}
}
}
parseMultiplicative() {
// '*', '%', '/'
var result = this.parsePrefix();
while (true) {
if (this.optionalOperator('*')) {
result = new Binary('*', result, this.parsePrefix());
}
else if (this.optionalOperator('%')) {
result = new Binary('%', result, this.parsePrefix());
}
else if (this.optionalOperator('/')) {
result = new Binary('/', result, this.parsePrefix());
}
else {
return result;
}
}
}
parsePrefix() {
if (this.optionalOperator('+')) {
return this.parsePrefix();
}
else if (this.optionalOperator('-')) {
return new Binary('-', new LiteralPrimitive(0), this.parsePrefix());
}
else if (this.optionalOperator('!')) {
return new PrefixNot(this.parsePrefix());
}
else {
return this.parseCallChain();
}
}
parseCallChain() {
var result = this.parsePrimary();
while (true) {
if (this.optionalCharacter($PERIOD)) {
result = this.parseAccessMemberOrMethodCall(result, false);
}
else if (this.optionalOperator('?.')) {
result = this.parseAccessMemberOrMethodCall(result, true);
}
else if (this.optionalCharacter($LBRACKET)) {
var key = this.parsePipe();
this.expectCharacter($RBRACKET);
if (this.optionalOperator("=")) {
var value = this.parseConditional();
result = new KeyedWrite(result, key, value);
}
else {
result = new KeyedRead(result, key);
}
}
else if (this.optionalCharacter($LPAREN)) {
var args = this.parseCallArguments();
this.expectCharacter($RPAREN);
result = new FunctionCall(result, args);
}
else {
return result;
}
}
}
parsePrimary() {
if (this.optionalCharacter($LPAREN)) {
let result = this.parsePipe();
this.expectCharacter($RPAREN);
return result;
}
else if (this.next.isKeywordNull() || this.next.isKeywordUndefined()) {
this.advance();
return new LiteralPrimitive(null);
}
else if (this.next.isKeywordTrue()) {
this.advance();
return new LiteralPrimitive(true);
}
else if (this.next.isKeywordFalse()) {
this.advance();
return new LiteralPrimitive(false);
}
else if (this.optionalCharacter($LBRACKET)) {
var elements = this.parseExpressionList($RBRACKET);
this.expectCharacter($RBRACKET);
return new LiteralArray(elements);
}
else if (this.next.isCharacter($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 LiteralPrimitive(value);
}
else if (this.next.isString()) {
var literalValue = this.next.toString();
this.advance();
return new LiteralPrimitive(literalValue);
}
else if (this.index >= this.tokens.length) {
this.error(`Unexpected end of expression: ${this.input}`);
}
else {
this.error(`Unexpected token ${this.next}`);
}
// error() throws, so we don't reach here.
throw new BaseException("Fell through all cases in parsePrimary");
}
parseExpressionList(terminator) {
var result = [];
if (!this.next.isCharacter(terminator)) {
do {
result.push(this.parsePipe());
} while (this.optionalCharacter($COMMA));
}
return result;
}
parseLiteralMap() {
var keys = [];
var values = [];
this.expectCharacter($LBRACE);
if (!this.optionalCharacter($RBRACE)) {
do {
var key = this.expectIdentifierOrKeywordOrString();
keys.push(key);
this.expectCharacter($COLON);
values.push(this.parsePipe());
} while (this.optionalCharacter($COMMA));
this.expectCharacter($RBRACE);
}
return new LiteralMap(keys, values);
}
parseAccessMemberOrMethodCall(receiver, isSafe = false) {
let id = this.expectIdentifierOrKeyword();
if (this.optionalCharacter($LPAREN)) {
let args = this.parseCallArguments();
this.expectCharacter($RPAREN);
return isSafe ? new SafeMethodCall(receiver, id, args) : new MethodCall(receiver, id, args);
}
else {
if (isSafe) {
if (this.optionalOperator("=")) {
this.error("The '?.' operator cannot be used in the assignment");
}
else {
return new SafePropertyRead(receiver, id);
}
}
else {
if (this.optionalOperator("=")) {
if (!this.parseAction) {
this.error("Bindings cannot contain assignments");
}
let value = this.parseConditional();
return new PropertyWrite(receiver, id, value);
}
else {
return new PropertyRead(receiver, id);
}
}
}
return null;
}
parseCallArguments() {
if (this.next.isCharacter($RPAREN))
return [];
var positionals = [];
do {
positionals.push(this.parsePipe());
} while (this.optionalCharacter($COMMA));
return positionals;
}
parseBlockContent() {
if (!this.parseAction) {
this.error("Binding expression cannot contain chained expression");
}
var exprs = [];
while (this.index < this.tokens.length && !this.next.isCharacter($RBRACE)) {
var expr = this.parseExpression();
exprs.push(expr);
if (this.optionalCharacter($SEMICOLON)) {
while (this.optionalCharacter($SEMICOLON)) {
} // read all semicolons
}
}
if (exprs.length == 0)
return new EmptyExpr();
if (exprs.length == 1)
return exprs[0];
return new Chain(exprs);
}
/**
* An identifier, a keyword, a string with an optional `-` inbetween.
*/
expectTemplateBindingKey() {
var result = '';
var operatorFound = false;
do {
result += this.expectIdentifierOrKeywordOrString();
operatorFound = this.optionalOperator('-');
if (operatorFound) {
result += '-';
}
} while (operatorFound);
return result.toString();
}
parseTemplateBindings() {
var bindings = [];
var prefix = null;
var warnings = [];
while (this.index < this.tokens.length) {
var keyIsVar = this.peekKeywordLet();
if (!keyIsVar && this.peekDeprecatedKeywordVar()) {
keyIsVar = true;
warnings.push(`"var" inside of expressions is deprecated. Use "let" instead!`);
}
if (!keyIsVar && this.peekDeprecatedOperatorHash()) {
keyIsVar = true;
warnings.push(`"#" inside of expressions is deprecated. Use "let" instead!`);
}
if (keyIsVar) {
this.advance();
}
var key = this.expectTemplateBindingKey();
if (!keyIsVar) {
if (prefix == null) {
prefix = key;
}
else {
key = prefix + key[0].toUpperCase() + key.substring(1);
}
}
this.optionalCharacter($COLON);
var name = null;
var expression = null;
if (keyIsVar) {
if (this.optionalOperator("=")) {
name = this.expectTemplateBindingKey();
}
else {
name = '\$implicit';
}
}
else if (this.next !== EOF && !this.peekKeywordLet() && !this.peekDeprecatedKeywordVar() &&
!this.peekDeprecatedOperatorHash()) {
var start = this.inputIndex;
var ast = this.parsePipe();
var source = this.input.substring(start, this.inputIndex);
expression = new ASTWithSource(ast, source, this.location);
}
bindings.push(new TemplateBinding(key, keyIsVar, name, expression));
if (!this.optionalCharacter($SEMICOLON)) {
this.optionalCharacter($COMMA);
}
}
return new TemplateBindingParseResult(bindings, warnings);
}
error(message, index = null) {
if (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);
}
}
class SimpleExpressionChecker {
constructor() {
this.simple = true;
}
static check(ast) {
var s = new SimpleExpressionChecker();
ast.visit(s);
return s.simple;
}
visitImplicitReceiver(ast, context) { }
visitInterpolation(ast, context) { this.simple = false; }
visitLiteralPrimitive(ast, context) { }
visitPropertyRead(ast, context) { }
visitPropertyWrite(ast, context) { this.simple = false; }
visitSafePropertyRead(ast, context) { this.simple = false; }
visitMethodCall(ast, context) { this.simple = false; }
visitSafeMethodCall(ast, context) { this.simple = false; }
visitFunctionCall(ast, context) { this.simple = false; }
visitLiteralArray(ast, context) { this.visitAll(ast.expressions); }
visitLiteralMap(ast, context) { this.visitAll(ast.values); }
visitBinary(ast, context) { this.simple = false; }
visitPrefixNot(ast, context) { this.simple = false; }
visitConditional(ast, context) { this.simple = false; }
visitPipe(ast, context) { this.simple = false; }
visitKeyedRead(ast, context) { this.simple = false; }
visitKeyedWrite(ast, context) { this.simple = false; }
visitAll(asts) {
var res = ListWrapper.createFixedSize(asts.length);
for (var i = 0; i < asts.length; ++i) {
res[i] = asts[i].visit(this);
}
return res;
}
visitChain(ast, context) { this.simple = false; }
visitQuote(ast, context) { this.simple = false; }
}