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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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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import {unparse} from './utils/unparser';
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import {validate} from './utils/validator';
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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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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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it('should parse null', () => { checkAction('null'); });
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it('should parse undefined', () => { checkAction('undefined'); });
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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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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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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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it('should parse multiplicative expressions',
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() => { checkAction('3*4/2%5', '3 * 4 / 2 % 5'); });
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it('should parse additive expressions', () => { checkAction('3 + 6 - 2'); });
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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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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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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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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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it('should parse grouped expressions', () => { checkAction('(1 + 2) * 3', '1 + 2 * 3'); });
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it('should ignore comments in expressions', () => { checkAction('a //comment', 'a'); });
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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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it('should parse an empty string', () => { checkAction(''); });
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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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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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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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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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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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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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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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describe('functional calls', () => {
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it('should parse function calls', () => { checkAction('fn()(1, 2)'); });
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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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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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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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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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it('should support array updates', () => { checkAction('a[0] = 200'); });
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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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it('should store the source in the result',
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() => { expect(parseAction('someExpr', 'someExpr')); });
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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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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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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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it('should report reasonable error for unconsumed tokens',
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() => { expectActionError(')', 'Unexpected token ) at column 1 in [)]'); });
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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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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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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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it('should parse quoted expressions', () => { checkBinding('a:b', 'a:b'); });
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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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it('should ignore whitespace around quote prefix', () => { checkBinding(' a :b', 'a:b'); });
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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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it('should store the source in the result',
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() => { expect(parseBinding('someExpr').source).toBe('someExpr'); });
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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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it('should report chain expressions',
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() => { expectError(parseBinding('1;2'), 'contain chained expression'); });
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it('should report assignment',
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() => { expectError(parseBinding('a=2'), 'contain assignments'); });
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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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it('should parse conditional expression', () => { checkBinding('a < b ? a : b'); });
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it('should ignore comments in bindings', () => { checkBinding('a //comment', 'a'); });
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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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it('should retain // in : microsyntax', () => { checkBinding('one:a//b', 'one:a//b'); });
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});
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describe('parseTemplateBindings', () => {
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function keys(templateBindings: any[]) { return templateBindings.map(binding => binding.key); }
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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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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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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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it('should parse a key without a value',
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() => { expect(keys(parseTemplateBindings('a', ''))).toEqual(['a']); });
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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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bindings = parseTemplateBindings('a-b', 'c');
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expect(keys(bindings)).toEqual(['a-b']);
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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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bindings = parseTemplateBindings('a', '1+1');
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expect(exprSources(bindings)).toEqual(['1+1']);
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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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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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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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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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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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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=$implicit']);
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bindings = parseTemplateBindings('key', 'let a; let b');
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expect(keyValues(bindings)).toEqual([
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'key',
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'let a=$implicit',
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'let b=$implicit',
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]);
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bindings = parseTemplateBindings('key', 'let a; let b;');
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expect(keyValues(bindings)).toEqual([
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'key',
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'let a=$implicit',
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'let b=$implicit',
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]);
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bindings = parseTemplateBindings('key', 'let i-a = k-a');
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expect(keyValues(bindings)).toEqual([
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'key',
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'let i-a=k-a',
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]);
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bindings = parseTemplateBindings('key', 'let item; let i = k');
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expect(keyValues(bindings)).toEqual([
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'key',
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'let item=$implicit',
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'let i=k',
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]);
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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=$implicit',
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'directiveIn=expr in location',
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'let a=b',
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]);
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});
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it('should support as notation', () => {
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let bindings = parseTemplateBindings('ngIf', 'exp as local', 'location');
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expect(keyValues(bindings)).toEqual(['ngIf=exp in location', 'let local=ngIf']);
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bindings = parseTemplateBindings('ngFor', 'let item of items as iter; index as i', 'L');
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expect(keyValues(bindings)).toEqual([
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'ngFor', 'let item=$implicit', 'ngForOf=items in L', 'let iter=ngForOf', 'let i=index'
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]);
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});
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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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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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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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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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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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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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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');
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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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});
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describe('comments', () => {
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it('should ignore comments in interpolation expressions',
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() => { checkInterpolation('{{a //comment}}', '{{ a }}'); });
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it('should retain // in single quote strings', () => {
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checkInterpolation(`{{ 'http://www.google.com' }}`, `{{ "http://www.google.com" }}`);
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});
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it('should retain // in double quote strings', () => {
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checkInterpolation(`{{ "http://www.google.com" }}`, `{{ "http://www.google.com" }}`);
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});
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it('should ignore comments after string literals',
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() => { checkInterpolation(`{{ "a//b" //comment }}`, `{{ "a//b" }}`); });
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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\`" }}`); });
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});
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});
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describe('parseSimpleBinding', () => {
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it('should parse a field access', () => {
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const p = parseSimpleBinding('name');
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expect(unparse(p)).toEqual('name');
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validate(p);
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});
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it('should report when encountering pipes', () => {
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expectError(
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validate(parseSimpleBinding('a | somePipe')),
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'Host binding expression cannot contain pipes');
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});
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it('should report when encountering interpolation', () => {
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expectError(
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validate(parseSimpleBinding('{{exp}}')),
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'Got interpolation ({{}}) where expression was expected');
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});
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it('should report when encountering field write', () => {
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expectError(validate(parseSimpleBinding('a = b')), 'Bindings cannot contain assignments');
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});
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});
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describe('wrapLiteralPrimitive', () => {
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it('should wrap a literal primitive', () => {
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expect(unparse(validate(createParser().wrapLiteralPrimitive('foo', null)))).toEqual('"foo"');
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});
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});
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describe('error recovery', () => {
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function recover(text: string, expected?: string) {
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const expr = validate(parseAction(text));
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|
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);
|
|
} |