angular-cn/modules/@angular/compiler/test/expression_parser/parser_spec.ts

531 lines
19 KiB
TypeScript

/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {AST, BindingPipe} from '@angular/compiler/src/expression_parser/ast';
import {Lexer} from '@angular/compiler/src/expression_parser/lexer';
import {Parser} from '@angular/compiler/src/expression_parser/parser';
import {beforeEach, ddescribe, describe, expect, iit, it, xit} from '@angular/core/testing';
import {isBlank, isPresent} from '../../src/facade/lang';
import {Unparser} from './unparser';
export function main() {
function createParser() { return new Parser(new Lexer()); }
function parseAction(text: string, location: any = null): any {
return createParser().parseAction(text, location);
}
function parseBinding(text: string, location: any = null): any {
return createParser().parseBinding(text, location);
}
function parseTemplateBindings(text: string, location: any = null): any {
return createParser().parseTemplateBindings(text, location).templateBindings;
}
function parseInterpolation(text: string, location: any = null): any {
return createParser().parseInterpolation(text, location);
}
function parseSimpleBinding(text: string, location: any = null): any {
return createParser().parseSimpleBinding(text, location);
}
function unparse(ast: AST): string { return new Unparser().unparse(ast); }
function checkInterpolation(exp: string, expected?: string) {
var ast = parseInterpolation(exp);
if (isBlank(expected)) expected = exp;
expect(unparse(ast)).toEqual(expected);
}
function checkBinding(exp: string, expected?: string) {
var ast = parseBinding(exp);
if (isBlank(expected)) expected = exp;
expect(unparse(ast)).toEqual(expected);
}
function checkAction(exp: string, expected?: string) {
var ast = parseAction(exp);
if (isBlank(expected)) expected = exp;
expect(unparse(ast)).toEqual(expected);
}
function expectActionError(text: any /** TODO #9100 */) {
return expect(() => parseAction(text));
}
function expectBindingError(text: any /** TODO #9100 */) {
return expect(() => parseBinding(text));
}
describe('parser', () => {
describe('parseAction', () => {
it('should parse numbers', () => { checkAction('1'); });
it('should parse strings', () => {
checkAction('\'1\'', '"1"');
checkAction('"1"');
});
it('should parse null', () => { checkAction('null'); });
it('should parse unary - expressions', () => {
checkAction('-1', '0 - 1');
checkAction('+1', '1');
});
it('should parse unary ! expressions', () => {
checkAction('!true');
checkAction('!!true');
checkAction('!!!true');
});
it('should parse multiplicative expressions',
() => { checkAction('3*4/2%5', '3 * 4 / 2 % 5'); });
it('should parse additive expressions', () => { checkAction('3 + 6 - 2'); });
it('should parse relational expressions', () => {
checkAction('2 < 3');
checkAction('2 > 3');
checkAction('2 <= 2');
checkAction('2 >= 2');
});
it('should parse equality expressions', () => {
checkAction('2 == 3');
checkAction('2 != 3');
});
it('should parse strict equality expressions', () => {
checkAction('2 === 3');
checkAction('2 !== 3');
});
it('should parse expressions', () => {
checkAction('true && true');
checkAction('true || false');
});
it('should parse grouped expressions', () => { checkAction('(1 + 2) * 3', '1 + 2 * 3'); });
it('should ignore comments in expressions', () => { checkAction('a //comment', 'a'); });
it('should retain // in string literals',
() => { checkAction(`"http://www.google.com"`, `"http://www.google.com"`); });
it('should parse an empty string', () => { checkAction(''); });
describe('literals', () => {
it('should parse array', () => {
checkAction('[1][0]');
checkAction('[[1]][0][0]');
checkAction('[]');
checkAction('[].length');
checkAction('[1, 2].length');
});
it('should parse map', () => {
checkAction('{}');
checkAction('{a: 1}[2]');
checkAction('{}["a"]');
});
it('should only allow identifier, string, or keyword as map key', () => {
expectActionError('{(:0}').toThrowError(/expected identifier, keyword, or string/);
expectActionError('{1234:0}').toThrowError(/expected identifier, keyword, or string/);
});
});
describe('member access', () => {
it('should parse field access', () => {
checkAction('a');
checkAction('a.a');
});
it('should only allow identifier or keyword as member names', () => {
expectActionError('x.(').toThrowError(/identifier or keyword/);
expectActionError('x. 1234').toThrowError(/identifier or keyword/);
expectActionError('x."foo"').toThrowError(/identifier or keyword/);
});
it('should parse safe field access', () => {
checkAction('a?.a');
checkAction('a.a?.a');
});
});
describe('method calls', () => {
it('should parse method calls', () => {
checkAction('fn()');
checkAction('add(1, 2)');
checkAction('a.add(1, 2)');
checkAction('fn().add(1, 2)');
});
});
describe('functional calls', () => {
it('should parse function calls', () => { checkAction('fn()(1, 2)'); });
});
describe('conditional', () => {
it('should parse ternary/conditional expressions', () => {
checkAction('7 == 3 + 4 ? 10 : 20');
checkAction('false ? 10 : 20');
});
it('should throw on incorrect ternary operator syntax', () => {
expectActionError('true?1').toThrowError(
/Parser Error: Conditional expression true\?1 requires all 3 expressions/);
});
});
describe('assignment', () => {
it('should support field assignments', () => {
checkAction('a = 12');
checkAction('a.a.a = 123');
checkAction('a = 123; b = 234;');
});
it('should throw on safe field assignments', () => {
expectActionError('a?.a = 123').toThrowError(/cannot be used in the assignment/);
});
it('should support array updates', () => { checkAction('a[0] = 200'); });
});
it('should error when using pipes',
() => { expectActionError('x|blah').toThrowError(/Cannot have a pipe/); });
it('should store the source in the result',
() => { expect(parseAction('someExpr').source).toBe('someExpr'); });
it('should store the passed-in location',
() => { expect(parseAction('someExpr', 'location').location).toBe('location'); });
it('should throw when encountering interpolation', () => {
expectActionError('{{a()}}').toThrowError(
/Got interpolation \(\{\{\}\}\) where expression was expected/);
});
});
describe('general error handling', () => {
it('should throw on an unexpected token',
() => { expectActionError('[1,2] trac').toThrowError(/Unexpected token \'trac\'/); });
it('should throw a reasonable error for unconsumed tokens', () => {
expectActionError(')').toThrowError(/Unexpected token \) at column 1 in \[\)\]/);
});
it('should throw on missing expected token', () => {
expectActionError('a(b').toThrowError(
/Missing expected \) at the end of the expression \[a\(b\]/);
});
});
describe('parseBinding', () => {
describe('pipes', () => {
it('should parse pipes', () => {
checkBinding('a(b | c)', 'a((b | c))');
checkBinding('a.b(c.d(e) | f)', 'a.b((c.d(e) | f))');
checkBinding('[1, 2, 3] | a', '([1, 2, 3] | a)');
checkBinding('{a: 1} | b', '({a: 1} | b)');
checkBinding('a[b] | c', '(a[b] | c)');
checkBinding('a?.b | c', '(a?.b | c)');
checkBinding('true | a', '(true | a)');
checkBinding('a | b:c | d', '((a | b:c) | d)');
checkBinding('a | b:(c | d)', '(a | b:(c | d))');
});
it('should only allow identifier or keyword as formatter names', () => {
expectBindingError('"Foo"|(').toThrowError(/identifier or keyword/);
expectBindingError('"Foo"|1234').toThrowError(/identifier or keyword/);
expectBindingError('"Foo"|"uppercase"').toThrowError(/identifier or keyword/);
});
it('should parse quoted expressions', () => { checkBinding('a:b', 'a:b'); });
it('should not crash when prefix part is not tokenizable',
() => { checkBinding('"a:b"', '"a:b"'); });
it('should ignore whitespace around quote prefix', () => { checkBinding(' a :b', 'a:b'); });
it('should refuse prefixes that are not single identifiers', () => {
expectBindingError('a + b:c').toThrowError();
expectBindingError('1:c').toThrowError();
});
});
it('should store the source in the result',
() => { expect(parseBinding('someExpr').source).toBe('someExpr'); });
it('should store the passed-in location',
() => { expect(parseBinding('someExpr', 'location').location).toBe('location'); });
it('should throw on chain expressions',
() => { expect(() => parseBinding('1;2')).toThrowError(/contain chained expression/); });
it('should throw on assignment',
() => { expect(() => parseBinding('a=2')).toThrowError(/contain assignments/); });
it('should throw when encountering interpolation', () => {
expectBindingError('{{a.b}}').toThrowError(
/Got interpolation \(\{\{\}\}\) where expression was expected/);
});
it('should parse conditional expression', () => { checkBinding('a < b ? a : b'); });
it('should ignore comments in bindings', () => { checkBinding('a //comment', 'a'); });
it('should retain // in string literals',
() => { checkBinding(`"http://www.google.com"`, `"http://www.google.com"`); });
it('should retain // in : microsyntax', () => { checkBinding('one:a//b', 'one:a//b'); });
});
describe('parseTemplateBindings', () => {
function keys(templateBindings: any[]) {
return templateBindings.map(binding => binding.key);
}
function keyValues(templateBindings: any[]) {
return templateBindings.map(binding => {
if (binding.keyIsVar) {
return 'let ' + binding.key + (isBlank(binding.name) ? '=null' : '=' + binding.name);
} else {
return binding.key + (isBlank(binding.expression) ? '' : `=${binding.expression}`)
}
});
}
function exprSources(templateBindings: any[]) {
return templateBindings.map(
binding => isPresent(binding.expression) ? binding.expression.source : null);
}
it('should parse an empty string', () => { expect(parseTemplateBindings('')).toEqual([]); });
it('should parse a string without a value',
() => { expect(keys(parseTemplateBindings('a'))).toEqual(['a']); });
it('should only allow identifier, string, or keyword including dashes as keys', () => {
var bindings = parseTemplateBindings('a:\'b\'');
expect(keys(bindings)).toEqual(['a']);
bindings = parseTemplateBindings('\'a\':\'b\'');
expect(keys(bindings)).toEqual(['a']);
bindings = parseTemplateBindings('"a":\'b\'');
expect(keys(bindings)).toEqual(['a']);
bindings = parseTemplateBindings('a-b:\'c\'');
expect(keys(bindings)).toEqual(['a-b']);
expect(() => {
parseTemplateBindings('(:0');
}).toThrowError(/expected identifier, keyword, or string/);
expect(() => {
parseTemplateBindings('1234:0');
}).toThrowError(/expected identifier, keyword, or string/);
});
it('should detect expressions as value', () => {
var bindings = parseTemplateBindings('a:b');
expect(exprSources(bindings)).toEqual(['b']);
bindings = parseTemplateBindings('a:1+1');
expect(exprSources(bindings)).toEqual(['1+1']);
});
it('should detect names as value', () => {
var bindings = parseTemplateBindings('a:let b');
expect(keyValues(bindings)).toEqual(['a', 'let b=\$implicit']);
});
it('should allow space and colon as separators', () => {
var bindings = parseTemplateBindings('a:b');
expect(keys(bindings)).toEqual(['a']);
expect(exprSources(bindings)).toEqual(['b']);
bindings = parseTemplateBindings('a b');
expect(keys(bindings)).toEqual(['a']);
expect(exprSources(bindings)).toEqual(['b']);
});
it('should allow multiple pairs', () => {
var bindings = parseTemplateBindings('a 1 b 2');
expect(keys(bindings)).toEqual(['a', 'aB']);
expect(exprSources(bindings)).toEqual(['1 ', '2']);
});
it('should store the sources in the result', () => {
var bindings = parseTemplateBindings('a 1,b 2');
expect(bindings[0].expression.source).toEqual('1');
expect(bindings[1].expression.source).toEqual('2');
});
it('should store the passed-in location', () => {
var bindings = parseTemplateBindings('a 1,b 2', 'location');
expect(bindings[0].expression.location).toEqual('location');
});
it('should support var notation with a deprecation warning', () => {
var bindings = createParser().parseTemplateBindings('var i', null);
expect(keyValues(bindings.templateBindings)).toEqual(['let i=\$implicit']);
expect(bindings.warnings).toEqual([
'"var" inside of expressions is deprecated. Use "let" instead!'
]);
});
it('should support # notation with a deprecation warning', () => {
var bindings = createParser().parseTemplateBindings('#i', null);
expect(keyValues(bindings.templateBindings)).toEqual(['let i=\$implicit']);
expect(bindings.warnings).toEqual([
'"#" inside of expressions is deprecated. Use "let" instead!'
]);
});
it('should support let notation', () => {
var bindings = parseTemplateBindings('let i');
expect(keyValues(bindings)).toEqual(['let i=\$implicit']);
bindings = parseTemplateBindings('let i');
expect(keyValues(bindings)).toEqual(['let i=\$implicit']);
bindings = parseTemplateBindings('let a; let b');
expect(keyValues(bindings)).toEqual(['let a=\$implicit', 'let b=\$implicit']);
bindings = parseTemplateBindings('let a; let b;');
expect(keyValues(bindings)).toEqual(['let a=\$implicit', 'let b=\$implicit']);
bindings = parseTemplateBindings('let i-a = k-a');
expect(keyValues(bindings)).toEqual(['let i-a=k-a']);
bindings = parseTemplateBindings('keyword let item; let i = k');
expect(keyValues(bindings)).toEqual(['keyword', 'let item=\$implicit', 'let i=k']);
bindings = parseTemplateBindings('keyword: let item; let i = k');
expect(keyValues(bindings)).toEqual(['keyword', 'let item=\$implicit', 'let i=k']);
bindings = parseTemplateBindings('directive: let item in expr; let a = b', 'location');
expect(keyValues(bindings)).toEqual([
'directive', 'let item=\$implicit', 'directiveIn=expr in location', 'let a=b'
]);
});
it('should parse pipes', () => {
var bindings = parseTemplateBindings('key value|pipe');
var ast = bindings[0].expression.ast;
expect(ast).toBeAnInstanceOf(BindingPipe);
});
});
describe('parseInterpolation', () => {
it('should return null if no interpolation',
() => { expect(parseInterpolation('nothing')).toBe(null); });
it('should parse no prefix/suffix interpolation', () => {
var ast = parseInterpolation('{{a}}').ast;
expect(ast.strings).toEqual(['', '']);
expect(ast.expressions.length).toEqual(1);
expect(ast.expressions[0].name).toEqual('a');
});
it('should parse prefix/suffix with multiple interpolation', () => {
var originalExp = 'before {{ a }} middle {{ b }} after';
var ast = parseInterpolation(originalExp).ast;
expect(new Unparser().unparse(ast)).toEqual(originalExp);
});
it('should throw on empty interpolation expressions', () => {
expect(() => parseInterpolation('{{}}'))
.toThrowError(
/Parser Error: Blank expressions are not allowed in interpolated strings/);
expect(() => parseInterpolation('foo {{ }}'))
.toThrowError(
/Parser Error: Blank expressions are not allowed in interpolated strings/);
});
it('should parse conditional expression',
() => { checkInterpolation('{{ a < b ? a : b }}'); });
it('should parse expression with newline characters', () => {
checkInterpolation(`{{ 'foo' +\n 'bar' +\r 'baz' }}`, `{{ "foo" + "bar" + "baz" }}`);
});
it('should support custom interpolation', () => {
const parser = new Parser(new Lexer());
const ast = parser.parseInterpolation('{% a %}', null, {start: '{%', end: '%}'}).ast as any;
expect(ast.strings).toEqual(['', '']);
expect(ast.expressions.length).toEqual(1);
expect(ast.expressions[0].name).toEqual('a');
});
describe('comments', () => {
it('should ignore comments in interpolation expressions',
() => { checkInterpolation('{{a //comment}}', '{{ a }}'); });
it('should retain // in single quote strings', () => {
checkInterpolation(`{{ 'http://www.google.com' }}`, `{{ "http://www.google.com" }}`);
});
it('should retain // in double quote strings', () => {
checkInterpolation(`{{ "http://www.google.com" }}`, `{{ "http://www.google.com" }}`);
});
it('should ignore comments after string literals',
() => { checkInterpolation(`{{ "a//b" //comment }}`, `{{ "a//b" }}`); });
it('should retain // in complex strings', () => {
checkInterpolation(
`{{"//a\'//b\`//c\`//d\'//e" //comment}}`, `{{ "//a\'//b\`//c\`//d\'//e" }}`);
});
it('should retain // in nested, unterminated strings',
() => { checkInterpolation(`{{ "a\'b\`" //comment}}`, `{{ "a\'b\`" }}`); });
});
});
describe('parseSimpleBinding', () => {
it('should parse a field access', () => {
var p = parseSimpleBinding('name');
expect(unparse(p)).toEqual('name');
});
it('should parse a constant', () => {
var p = parseSimpleBinding('[1, 2]');
expect(unparse(p)).toEqual('[1, 2]');
});
it('should throw when the given expression is not just a field name', () => {
expect(() => parseSimpleBinding('name + 1'))
.toThrowError(/Host binding expression can only contain field access and constants/);
});
it('should throw when encountering interpolation', () => {
expect(() => parseSimpleBinding('{{exp}}'))
.toThrowError(/Got interpolation \(\{\{\}\}\) where expression was expected/);
});
});
describe('wrapLiteralPrimitive', () => {
it('should wrap a literal primitive', () => {
expect(unparse(createParser().wrapLiteralPrimitive('foo', null))).toEqual('"foo"');
});
});
});
}