598 lines
		
	
	
		
			21 KiB
		
	
	
	
		
			TypeScript
		
	
	
	
	
	
			
		
		
	
	
			598 lines
		
	
	
		
			21 KiB
		
	
	
	
		
			TypeScript
		
	
	
	
	
	
| /**
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|  * @license
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|  * Copyright Google Inc. All Rights Reserved.
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|  *
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|  * Use of this source code is governed by an MIT-style license that can be
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|  * found in the LICENSE file at https://angular.io/license
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|  */
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| 
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| import {ASTWithSource, BindingPipe, Interpolation, ParserError, TemplateBinding} from '@angular/compiler/src/expression_parser/ast';
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| import {Lexer} from '@angular/compiler/src/expression_parser/lexer';
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| import {Parser, SplitInterpolation, TemplateBindingParseResult} from '@angular/compiler/src/expression_parser/parser';
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| import {expect} from '@angular/platform-browser/testing/src/matchers';
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| 
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| 
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| import {unparse} from './utils/unparser';
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| import {validate} from './utils/validator';
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| 
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| describe('parser', () => {
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|   describe('parseAction', () => {
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|     it('should parse numbers', () => { checkAction('1'); });
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| 
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|     it('should parse strings', () => {
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|       checkAction('\'1\'', '"1"');
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|       checkAction('"1"');
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|     });
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| 
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|     it('should parse null', () => { checkAction('null'); });
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| 
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|     it('should parse undefined', () => { checkAction('undefined'); });
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| 
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|     it('should parse unary - expressions', () => {
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|       checkAction('-1', '0 - 1');
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|       checkAction('+1', '1 - 0');
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|       checkAction(`-'1'`, `0 - "1"`);
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|       checkAction(`+'1'`, `"1" - 0`);
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|     });
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| 
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|     it('should parse unary ! expressions', () => {
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|       checkAction('!true');
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|       checkAction('!!true');
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|       checkAction('!!!true');
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|     });
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| 
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|     it('should parse postfix ! expression', () => {
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|       checkAction('true!');
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|       checkAction('a!.b');
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|       checkAction('a!!!!.b');
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|     });
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| 
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|     it('should parse multiplicative expressions',
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|        () => { checkAction('3*4/2%5', '3 * 4 / 2 % 5'); });
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| 
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|     it('should parse additive expressions', () => { checkAction('3 + 6 - 2'); });
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| 
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|     it('should parse relational expressions', () => {
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|       checkAction('2 < 3');
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|       checkAction('2 > 3');
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|       checkAction('2 <= 2');
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|       checkAction('2 >= 2');
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|     });
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| 
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|     it('should parse equality expressions', () => {
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|       checkAction('2 == 3');
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|       checkAction('2 != 3');
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|     });
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| 
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|     it('should parse strict equality expressions', () => {
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|       checkAction('2 === 3');
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|       checkAction('2 !== 3');
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|     });
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| 
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|     it('should parse expressions', () => {
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|       checkAction('true && true');
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|       checkAction('true || false');
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|     });
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| 
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|     it('should parse grouped expressions', () => { checkAction('(1 + 2) * 3', '1 + 2 * 3'); });
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| 
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|     it('should ignore comments in expressions', () => { checkAction('a //comment', 'a'); });
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| 
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|     it('should retain // in string literals',
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|        () => { checkAction(`"http://www.google.com"`, `"http://www.google.com"`); });
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| 
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|     it('should parse an empty string', () => { checkAction(''); });
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| 
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|     describe('literals', () => {
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|       it('should parse array', () => {
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|         checkAction('[1][0]');
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|         checkAction('[[1]][0][0]');
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|         checkAction('[]');
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|         checkAction('[].length');
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|         checkAction('[1, 2].length');
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|       });
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| 
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|       it('should parse map', () => {
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|         checkAction('{}');
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|         checkAction('{a: 1, "b": 2}[2]');
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|         checkAction('{}["a"]');
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|       });
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| 
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|       it('should only allow identifier, string, or keyword as map key', () => {
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|         expectActionError('{(:0}', 'expected identifier, keyword, or string');
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|         expectActionError('{1234:0}', 'expected identifier, keyword, or string');
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|       });
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|     });
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| 
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|     describe('member access', () => {
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|       it('should parse field access', () => {
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|         checkAction('a');
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|         checkAction('this.a', 'a');
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|         checkAction('a.a');
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|       });
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| 
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|       it('should only allow identifier or keyword as member names', () => {
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|         expectActionError('x.(', 'identifier or keyword');
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|         expectActionError('x. 1234', 'identifier or keyword');
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|         expectActionError('x."foo"', 'identifier or keyword');
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|       });
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| 
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|       it('should parse safe field access', () => {
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|         checkAction('a?.a');
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|         checkAction('a.a?.a');
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|       });
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|     });
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| 
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|     describe('method calls', () => {
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|       it('should parse method calls', () => {
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|         checkAction('fn()');
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|         checkAction('add(1, 2)');
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|         checkAction('a.add(1, 2)');
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|         checkAction('fn().add(1, 2)');
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|       });
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|     });
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| 
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|     describe('functional calls', () => {
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|       it('should parse function calls', () => { checkAction('fn()(1, 2)'); });
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|     });
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| 
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|     describe('conditional', () => {
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|       it('should parse ternary/conditional expressions', () => {
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|         checkAction('7 == 3 + 4 ? 10 : 20');
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|         checkAction('false ? 10 : 20');
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|       });
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| 
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|       it('should report incorrect ternary operator syntax', () => {
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|         expectActionError('true?1', 'Conditional expression true?1 requires all 3 expressions');
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|       });
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|     });
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| 
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|     describe('assignment', () => {
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|       it('should support field assignments', () => {
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|         checkAction('a = 12');
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|         checkAction('a.a.a = 123');
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|         checkAction('a = 123; b = 234;');
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|       });
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| 
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|       it('should report on safe field assignments',
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|          () => { expectActionError('a?.a = 123', 'cannot be used in the assignment'); });
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| 
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|       it('should support array updates', () => { checkAction('a[0] = 200'); });
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|     });
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| 
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|     it('should error when using pipes',
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|        () => { expectActionError('x|blah', 'Cannot have a pipe'); });
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| 
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|     it('should store the source in the result',
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|        () => { expect(parseAction('someExpr', 'someExpr')); });
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| 
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|     it('should store the passed-in location',
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|        () => { expect(parseAction('someExpr', 'location').location).toBe('location'); });
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| 
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|     it('should report when encountering interpolation', () => {
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|       expectActionError('{{a()}}', 'Got interpolation ({{}}) where expression was expected');
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|     });
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|   });
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| 
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|   describe('general error handling', () => {
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|     it('should report an unexpected token',
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|        () => { expectActionError('[1,2] trac', 'Unexpected token \'trac\''); });
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| 
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|     it('should report reasonable error for unconsumed tokens',
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|        () => { expectActionError(')', 'Unexpected token ) at column 1 in [)]'); });
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| 
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|     it('should report a missing expected token', () => {
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|       expectActionError('a(b', 'Missing expected ) at the end of the expression [a(b]');
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|     });
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|   });
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| 
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|   describe('parseBinding', () => {
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|     describe('pipes', () => {
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|       it('should parse pipes', () => {
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|         checkBinding('a(b | c)', 'a((b | c))');
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|         checkBinding('a.b(c.d(e) | f)', 'a.b((c.d(e) | f))');
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|         checkBinding('[1, 2, 3] | a', '([1, 2, 3] | a)');
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|         checkBinding('{a: 1, "b": 2} | c', '({a: 1, "b": 2} | c)');
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|         checkBinding('a[b] | c', '(a[b] | c)');
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|         checkBinding('a?.b | c', '(a?.b | c)');
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|         checkBinding('true | a', '(true | a)');
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|         checkBinding('a | b:c | d', '((a | b:c) | d)');
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|         checkBinding('a | b:(c | d)', '(a | b:(c | d))');
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|       });
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| 
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|       it('should only allow identifier or keyword as formatter names', () => {
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|         expectBindingError('"Foo"|(', 'identifier or keyword');
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|         expectBindingError('"Foo"|1234', 'identifier or keyword');
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|         expectBindingError('"Foo"|"uppercase"', 'identifier or keyword');
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|       });
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| 
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|       it('should parse quoted expressions', () => { checkBinding('a:b', 'a:b'); });
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| 
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|       it('should not crash when prefix part is not tokenizable',
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|          () => { checkBinding('"a:b"', '"a:b"'); });
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| 
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|       it('should ignore whitespace around quote prefix', () => { checkBinding(' a :b', 'a:b'); });
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| 
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|       it('should refuse prefixes that are not single identifiers', () => {
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|         expectBindingError('a + b:c', '');
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|         expectBindingError('1:c', '');
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|       });
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|     });
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| 
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|     it('should store the source in the result',
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|        () => { expect(parseBinding('someExpr').source).toBe('someExpr'); });
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| 
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|     it('should store the passed-in location',
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|        () => { expect(parseBinding('someExpr', 'location').location).toBe('location'); });
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| 
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|     it('should report chain expressions',
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|        () => { expectError(parseBinding('1;2'), 'contain chained expression'); });
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| 
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|     it('should report assignment',
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|        () => { expectError(parseBinding('a=2'), 'contain assignments'); });
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| 
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|     it('should report when encountering interpolation', () => {
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|       expectBindingError('{{a.b}}', 'Got interpolation ({{}}) where expression was expected');
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|     });
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| 
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|     it('should parse conditional expression', () => { checkBinding('a < b ? a : b'); });
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| 
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|     it('should ignore comments in bindings', () => { checkBinding('a //comment', 'a'); });
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| 
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|     it('should retain // in string literals',
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|        () => { checkBinding(`"http://www.google.com"`, `"http://www.google.com"`); });
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| 
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|     it('should retain // in : microsyntax', () => { checkBinding('one:a//b', 'one:a//b'); });
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| 
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|   });
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| 
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|   describe('parseTemplateBindings', () => {
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| 
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|     function keys(templateBindings: any[]) { return templateBindings.map(binding => binding.key); }
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| 
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|     function keyValues(templateBindings: any[]) {
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|       return templateBindings.map(binding => {
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|         if (binding.keyIsVar) {
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|           return 'let ' + binding.key + (binding.name == null ? '=null' : '=' + binding.name);
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|         } else {
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|           return binding.key + (binding.expression == null ? '' : `=${binding.expression}`);
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|         }
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|       });
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|     }
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| 
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|     function keySpans(source: string, templateBindings: TemplateBinding[]) {
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|       return templateBindings.map(
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|           binding => source.substring(binding.span.start, binding.span.end));
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|     }
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| 
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|     function exprSources(templateBindings: any[]) {
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|       return templateBindings.map(
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|           binding => binding.expression != null ? binding.expression.source : null);
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|     }
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| 
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|     it('should parse a key without a value',
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|        () => { expect(keys(parseTemplateBindings('a', ''))).toEqual(['a']); });
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| 
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|     it('should allow string including dashes as keys', () => {
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|       let bindings = parseTemplateBindings('a', 'b');
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|       expect(keys(bindings)).toEqual(['a']);
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| 
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|       bindings = parseTemplateBindings('a-b', 'c');
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|       expect(keys(bindings)).toEqual(['a-b']);
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|     });
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| 
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|     it('should detect expressions as value', () => {
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|       let bindings = parseTemplateBindings('a', 'b');
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|       expect(exprSources(bindings)).toEqual(['b']);
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| 
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|       bindings = parseTemplateBindings('a', '1+1');
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|       expect(exprSources(bindings)).toEqual(['1+1']);
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|     });
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| 
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|     it('should detect names as value', () => {
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|       const bindings = parseTemplateBindings('a', 'let b');
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|       expect(keyValues(bindings)).toEqual(['a', 'let b=$implicit']);
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|     });
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| 
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|     it('should allow space and colon as separators', () => {
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|       let bindings = parseTemplateBindings('a', 'b');
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|       expect(keys(bindings)).toEqual(['a']);
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|       expect(exprSources(bindings)).toEqual(['b']);
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|     });
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| 
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|     it('should allow multiple pairs', () => {
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|       const bindings = parseTemplateBindings('a', '1 b 2');
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|       expect(keys(bindings)).toEqual(['a', 'aB']);
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|       expect(exprSources(bindings)).toEqual(['1 ', '2']);
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|     });
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| 
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|     it('should store the sources in the result', () => {
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|       const bindings = parseTemplateBindings('a', '1,b 2');
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|       expect(bindings[0].expression !.source).toEqual('1');
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|       expect(bindings[1].expression !.source).toEqual('2');
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|     });
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| 
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|     it('should store the passed-in location', () => {
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|       const bindings = parseTemplateBindings('a', '1,b 2', 'location');
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|       expect(bindings[0].expression !.location).toEqual('location');
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|     });
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| 
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|     it('should support let notation', () => {
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|       let bindings = parseTemplateBindings('key', 'let i');
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|       expect(keyValues(bindings)).toEqual(['key', 'let i=$implicit']);
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| 
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|       bindings = parseTemplateBindings('key', 'let a; let b');
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|       expect(keyValues(bindings)).toEqual([
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|         'key',
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|         'let a=$implicit',
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|         'let b=$implicit',
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|       ]);
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| 
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|       bindings = parseTemplateBindings('key', 'let a; let b;');
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|       expect(keyValues(bindings)).toEqual([
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|         'key',
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|         'let a=$implicit',
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|         'let b=$implicit',
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|       ]);
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| 
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|       bindings = parseTemplateBindings('key', 'let i-a = k-a');
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|       expect(keyValues(bindings)).toEqual([
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|         'key',
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|         'let i-a=k-a',
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|       ]);
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| 
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|       bindings = parseTemplateBindings('key', 'let item; let i = k');
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|       expect(keyValues(bindings)).toEqual([
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|         'key',
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|         'let item=$implicit',
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|         'let i=k',
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|       ]);
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| 
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|       bindings = parseTemplateBindings('directive', 'let item in expr; let a = b', 'location');
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|       expect(keyValues(bindings)).toEqual([
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|         'directive',
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|         'let item=$implicit',
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|         'directiveIn=expr in location',
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|         'let a=b',
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|       ]);
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|     });
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| 
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|     it('should support as notation', () => {
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|       let bindings = parseTemplateBindings('ngIf', 'exp as local', 'location');
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|       expect(keyValues(bindings)).toEqual(['ngIf=exp  in location', 'let local=ngIf']);
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| 
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|       bindings = parseTemplateBindings('ngFor', 'let item of items as iter; index as i', 'L');
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|       expect(keyValues(bindings)).toEqual([
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|         'ngFor', 'let item=$implicit', 'ngForOf=items  in L', 'let iter=ngForOf', 'let i=index'
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|       ]);
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|     });
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| 
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|     it('should parse pipes', () => {
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|       const bindings = parseTemplateBindings('key', 'value|pipe');
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|       const ast = bindings[0].expression !.ast;
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|       expect(ast).toBeAnInstanceOf(BindingPipe);
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|     });
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| 
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|     describe('spans', () => {
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|       it('should should support let', () => {
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|         const source = 'let i';
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|         expect(keySpans(source, parseTemplateBindings('key', 'let i'))).toEqual(['', 'let i']);
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|       });
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| 
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|       it('should support multiple lets', () => {
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|         const source = 'let item; let i=index; let e=even;';
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|         expect(keySpans(source, parseTemplateBindings('key', source))).toEqual([
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|           '', 'let item', 'let i=index', 'let e=even'
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|         ]);
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|       });
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| 
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|       it('should support a prefix', () => {
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|         const source = 'let person of people';
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|         const prefix = 'ngFor';
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|         const bindings = parseTemplateBindings(prefix, source);
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|         expect(keyValues(bindings)).toEqual([
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|           'ngFor', 'let person=$implicit', 'ngForOf=people in null'
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|         ]);
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|         expect(keySpans(source, bindings)).toEqual(['', 'let person ', 'of people']);
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|       });
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|     });
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|   });
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| 
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|   describe('parseInterpolation', () => {
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|     it('should return null if no interpolation',
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|        () => { expect(parseInterpolation('nothing')).toBe(null); });
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| 
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|     it('should parse no prefix/suffix interpolation', () => {
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|       const ast = parseInterpolation('{{a}}') !.ast as Interpolation;
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|       expect(ast.strings).toEqual(['', '']);
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|       expect(ast.expressions.length).toEqual(1);
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|       expect(ast.expressions[0].name).toEqual('a');
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|     });
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| 
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|     it('should parse prefix/suffix with multiple interpolation', () => {
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|       const originalExp = 'before {{ a }} middle {{ b }} after';
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|       const ast = parseInterpolation(originalExp) !.ast;
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|       expect(unparse(ast)).toEqual(originalExp);
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|       validate(ast);
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|     });
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| 
 | |
|     it('should report empty interpolation expressions', () => {
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|       expectError(
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|           parseInterpolation('{{}}') !,
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|           'Blank expressions are not allowed in interpolated strings');
 | |
| 
 | |
|       expectError(
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|           parseInterpolation('foo {{  }}') !,
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|           'Parser Error: Blank expressions are not allowed in interpolated strings');
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|     });
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| 
 | |
|     it('should parse conditional expression', () => { checkInterpolation('{{ a < b ? a : b }}'); });
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| 
 | |
|     it('should parse expression with newline characters', () => {
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|       checkInterpolation(`{{ 'foo' +\n 'bar' +\r 'baz' }}`, `{{ "foo" + "bar" + "baz" }}`);
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|     });
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| 
 | |
|     it('should support custom interpolation', () => {
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|       const parser = new Parser(new Lexer());
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|       const ast = parser.parseInterpolation('{% a %}', null, {start: '{%', end: '%}'}) !.ast as any;
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|       expect(ast.strings).toEqual(['', '']);
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|       expect(ast.expressions.length).toEqual(1);
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|       expect(ast.expressions[0].name).toEqual('a');
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|     });
 | |
| 
 | |
|     describe('comments', () => {
 | |
|       it('should ignore comments in interpolation expressions',
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|          () => { checkInterpolation('{{a //comment}}', '{{ a }}'); });
 | |
| 
 | |
|       it('should retain // in single quote strings', () => {
 | |
|         checkInterpolation(`{{ 'http://www.google.com' }}`, `{{ "http://www.google.com" }}`);
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|       });
 | |
| 
 | |
|       it('should retain // in double quote strings', () => {
 | |
|         checkInterpolation(`{{ "http://www.google.com" }}`, `{{ "http://www.google.com" }}`);
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|       });
 | |
| 
 | |
|       it('should ignore comments after string literals',
 | |
|          () => { checkInterpolation(`{{ "a//b" //comment }}`, `{{ "a//b" }}`); });
 | |
| 
 | |
|       it('should retain // in complex strings', () => {
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|         checkInterpolation(
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|             `{{"//a\'//b\`//c\`//d\'//e" //comment}}`, `{{ "//a\'//b\`//c\`//d\'//e" }}`);
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|       });
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| 
 | |
|       it('should retain // in nested, unterminated strings',
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|          () => { checkInterpolation(`{{ "a\'b\`" //comment}}`, `{{ "a\'b\`" }}`); });
 | |
|     });
 | |
| 
 | |
|   });
 | |
| 
 | |
|   describe('parseSimpleBinding', () => {
 | |
|     it('should parse a field access', () => {
 | |
|       const p = parseSimpleBinding('name');
 | |
|       expect(unparse(p)).toEqual('name');
 | |
|       validate(p);
 | |
|     });
 | |
| 
 | |
|     it('should report when encountering pipes', () => {
 | |
|       expectError(
 | |
|           validate(parseSimpleBinding('a | somePipe')),
 | |
|           'Host binding expression cannot contain pipes');
 | |
|     });
 | |
| 
 | |
|     it('should report when encountering interpolation', () => {
 | |
|       expectError(
 | |
|           validate(parseSimpleBinding('{{exp}}')),
 | |
|           'Got interpolation ({{}}) where expression was expected');
 | |
|     });
 | |
| 
 | |
|     it('should report when encountering field write', () => {
 | |
|       expectError(validate(parseSimpleBinding('a = b')), 'Bindings cannot contain assignments');
 | |
|     });
 | |
|   });
 | |
| 
 | |
|   describe('wrapLiteralPrimitive', () => {
 | |
|     it('should wrap a literal primitive', () => {
 | |
|       expect(unparse(validate(createParser().wrapLiteralPrimitive('foo', null)))).toEqual('"foo"');
 | |
|     });
 | |
|   });
 | |
| 
 | |
|   describe('error recovery', () => {
 | |
|     function recover(text: string, expected?: string) {
 | |
|       const expr = validate(parseAction(text));
 | |
|       expect(unparse(expr)).toEqual(expected || text);
 | |
|     }
 | |
|     it('should be able to recover from an extra paren', () => recover('((a)))', 'a'));
 | |
|     it('should be able to recover from an extra bracket', () => recover('[[a]]]', '[[a]]'));
 | |
|     it('should be able to recover from a missing )', () => recover('(a;b', 'a; b;'));
 | |
|     it('should be able to recover from a missing ]', () => recover('[a,b', '[a, b]'));
 | |
|     it('should be able to recover from a missing selector', () => recover('a.'));
 | |
|     it('should be able to recover from a missing selector in a array literal',
 | |
|        () => recover('[[a.], b, c]'));
 | |
|   });
 | |
| 
 | |
|   describe('offsets', () => {
 | |
|     it('should retain the offsets of an interpolation', () => {
 | |
|       const interpolations = splitInterpolation('{{a}}  {{b}}  {{c}}') !;
 | |
|       expect(interpolations.offsets).toEqual([2, 9, 16]);
 | |
|     });
 | |
| 
 | |
|     it('should retain the offsets into the expression AST of interpolations', () => {
 | |
|       const source = parseInterpolation('{{a}}  {{b}}  {{c}}') !;
 | |
|       const interpolation = source.ast as Interpolation;
 | |
|       expect(interpolation.expressions.map(e => e.span.start)).toEqual([2, 9, 16]);
 | |
|     });
 | |
|   });
 | |
| });
 | |
| 
 | |
| function createParser() {
 | |
|   return new Parser(new Lexer());
 | |
| }
 | |
| 
 | |
| function parseAction(text: string, location: any = null): ASTWithSource {
 | |
|   return createParser().parseAction(text, location);
 | |
| }
 | |
| 
 | |
| function parseBinding(text: string, location: any = null): ASTWithSource {
 | |
|   return createParser().parseBinding(text, location);
 | |
| }
 | |
| 
 | |
| function parseTemplateBindingsResult(
 | |
|     key: string, value: string, location: any = null): TemplateBindingParseResult {
 | |
|   return createParser().parseTemplateBindings(key, value, location);
 | |
| }
 | |
| function parseTemplateBindings(
 | |
|     key: string, value: string, location: any = null): TemplateBinding[] {
 | |
|   return parseTemplateBindingsResult(key, value, location).templateBindings;
 | |
| }
 | |
| 
 | |
| function parseInterpolation(text: string, location: any = null): ASTWithSource|null {
 | |
|   return createParser().parseInterpolation(text, location);
 | |
| }
 | |
| 
 | |
| function splitInterpolation(text: string, location: any = null): SplitInterpolation|null {
 | |
|   return createParser().splitInterpolation(text, location);
 | |
| }
 | |
| 
 | |
| function parseSimpleBinding(text: string, location: any = null): ASTWithSource {
 | |
|   return createParser().parseSimpleBinding(text, location);
 | |
| }
 | |
| 
 | |
| function checkInterpolation(exp: string, expected?: string) {
 | |
|   const ast = parseInterpolation(exp) !;
 | |
|   if (expected == null) expected = exp;
 | |
|   expect(unparse(ast)).toEqual(expected);
 | |
|   validate(ast);
 | |
| }
 | |
| 
 | |
| function checkBinding(exp: string, expected?: string) {
 | |
|   const ast = parseBinding(exp);
 | |
|   if (expected == null) expected = exp;
 | |
|   expect(unparse(ast)).toEqual(expected);
 | |
|   validate(ast);
 | |
| }
 | |
| 
 | |
| function checkAction(exp: string, expected?: string) {
 | |
|   const ast = parseAction(exp);
 | |
|   if (expected == null) expected = exp;
 | |
|   expect(unparse(ast)).toEqual(expected);
 | |
|   validate(ast);
 | |
| }
 | |
| 
 | |
| function expectError(ast: {errors: ParserError[]}, message: string) {
 | |
|   for (const error of ast.errors) {
 | |
|     if (error.message.indexOf(message) >= 0) {
 | |
|       return;
 | |
|     }
 | |
|   }
 | |
|   const errMsgs = ast.errors.map(err => err.message).join('\n');
 | |
|   throw Error(
 | |
|       `Expected an error containing "${message}" to be reported, but got the errors:\n` + errMsgs);
 | |
| }
 | |
| 
 | |
| function expectActionError(text: string, message: string) {
 | |
|   expectError(validate(parseAction(text)), message);
 | |
| }
 | |
| 
 | |
| function expectBindingError(text: string, message: string) {
 | |
|   expectError(validate(parseBinding(text)), message);
 | |
| } |