angular-cn/packages/compiler/test/output/js_emitter_spec.ts

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/**
* @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 {StaticSymbol} from '@angular/compiler/src/aot/static_symbol';
import {JavaScriptEmitter} from '@angular/compiler/src/output/js_emitter';
import * as o from '@angular/compiler/src/output/output_ast';
import {newArray} from '@angular/compiler/src/util';
import {stripSourceMapAndNewLine} from './abstract_emitter_spec';
const someGenFilePath = 'somePackage/someGenFile';
const anotherModuleUrl = 'somePackage/someOtherPath';
const sameModuleIdentifier = new o.ExternalReference(null, 'someLocalId', null);
const externalModuleIdentifier = new o.ExternalReference(anotherModuleUrl, 'someExternalId', null);
{
// Note supported features of our OutputAstin JavaScript / ES5:
// - types
// - declaring fields
describe('JavaScriptEmitter', () => {
let emitter: JavaScriptEmitter;
let someVar: o.ReadVarExpr;
beforeEach(() => {
emitter = new JavaScriptEmitter();
someVar = o.variable('someVar');
});
function emitStmt(stmt: o.Statement, preamble?: string): string {
const source = emitter.emitStatements(someGenFilePath, [stmt], preamble);
return stripSourceMapAndNewLine(source);
}
it('should declare variables', () => {
expect(emitStmt(someVar.set(o.literal(1)).toDeclStmt())).toEqual(`var someVar = 1;`);
expect(emitStmt(someVar.set(o.literal(1)).toDeclStmt(null, [o.StmtModifier.Exported])))
.toEqual([
'var someVar = 1;',
`Object.defineProperty(exports, 'someVar', { get: function() { return someVar; }});`
].join('\n'));
});
it('should read and write variables', () => {
expect(emitStmt(someVar.toStmt())).toEqual(`someVar;`);
expect(emitStmt(someVar.set(o.literal(1)).toStmt())).toEqual(`someVar = 1;`);
expect(emitStmt(someVar.set(o.variable('someOtherVar').set(o.literal(1))).toStmt()))
.toEqual(`someVar = (someOtherVar = 1);`);
});
it('should read and write keys', () => {
expect(emitStmt(o.variable('someMap').key(o.variable('someKey')).toStmt()))
.toEqual(`someMap[someKey];`);
expect(emitStmt(o.variable('someMap').key(o.variable('someKey')).set(o.literal(1)).toStmt()))
.toEqual(`someMap[someKey] = 1;`);
});
it('should read and write properties', () => {
expect(emitStmt(o.variable('someObj').prop('someProp').toStmt()))
.toEqual(`someObj.someProp;`);
expect(emitStmt(o.variable('someObj').prop('someProp').set(o.literal(1)).toStmt()))
.toEqual(`someObj.someProp = 1;`);
});
it('should invoke functions and methods and constructors', () => {
expect(emitStmt(o.variable('someFn').callFn([o.literal(1)]).toStmt())).toEqual('someFn(1);');
expect(emitStmt(o.variable('someObj').callMethod('someMethod', [o.literal(1)]).toStmt()))
.toEqual('someObj.someMethod(1);');
expect(emitStmt(o.variable('SomeClass').instantiate([o.literal(1)]).toStmt()))
.toEqual('new SomeClass(1);');
});
it('should support builtin methods', () => {
expect(emitStmt(o.variable('arr1')
.callMethod(o.BuiltinMethod.ConcatArray, [o.variable('arr2')])
.toStmt()))
.toEqual('arr1.concat(arr2);');
expect(emitStmt(o.variable('observable')
.callMethod(o.BuiltinMethod.SubscribeObservable, [o.variable('listener')])
.toStmt()))
.toEqual('observable.subscribe(listener);');
expect(
emitStmt(
o.variable('fn').callMethod(o.BuiltinMethod.Bind, [o.variable('someObj')]).toStmt()))
.toEqual('fn.bind(someObj);');
});
it('should support literals', () => {
expect(emitStmt(o.literal(0).toStmt())).toEqual('0;');
expect(emitStmt(o.literal(true).toStmt())).toEqual('true;');
expect(emitStmt(o.literal('someStr').toStmt())).toEqual(`'someStr';`);
expect(emitStmt(o.literalArr([o.literal(1)]).toStmt())).toEqual(`[1];`);
expect(emitStmt(o.literalMap([
{key: 'someKey', value: o.literal(1), quoted: false},
{key: 'a', value: o.literal('a'), quoted: false},
{key: '*', value: o.literal('star'), quoted: true},
]).toStmt())
.replace(/\s+/gm, ''))
.toEqual(`{someKey:1,a:'a','*':'star'};`);
});
it('should break expressions into multiple lines if they are too long', () => {
const values: o.Expression[] = newArray(100);
values.fill(o.literal(1));
values.splice(50, 0, o.fn([], [new o.ReturnStatement(o.literal(1))]));
expect(emitStmt(o.variable('fn').callFn(values).toStmt())).toEqual([
'fn(1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,',
' 1,1,1,1,1,1,1,1,1,1,function() {', ' return 1;',
' },1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,',
' 1,1,1,1,1,1,1,1,1,1,1,1);'
].join('\n'));
});
it('should support blank literals', () => {
expect(emitStmt(o.literal(null).toStmt())).toEqual('null;');
expect(emitStmt(o.literal(undefined).toStmt())).toEqual('undefined;');
});
it('should support external identifiers', () => {
expect(emitStmt(o.importExpr(sameModuleIdentifier).toStmt())).toEqual('someLocalId;');
expect(emitStmt(o.importExpr(externalModuleIdentifier).toStmt())).toEqual([
`var i0 = re` +
`quire('somePackage/someOtherPath');`,
`i0.someExternalId;`
].join('\n'));
});
it('should support operators', () => {
const lhs = o.variable('lhs');
const rhs = o.variable('rhs');
expect(emitStmt(o.not(someVar).toStmt())).toEqual('!someVar;');
expect(emitStmt(o.assertNotNull(someVar).toStmt())).toEqual('someVar;');
expect(
emitStmt(someVar.conditional(o.variable('trueCase'), o.variable('falseCase')).toStmt()))
.toEqual('(someVar? trueCase: falseCase);');
expect(emitStmt(lhs.equals(rhs).toStmt())).toEqual('(lhs == rhs);');
expect(emitStmt(lhs.notEquals(rhs).toStmt())).toEqual('(lhs != rhs);');
expect(emitStmt(lhs.identical(rhs).toStmt())).toEqual('(lhs === rhs);');
expect(emitStmt(lhs.notIdentical(rhs).toStmt())).toEqual('(lhs !== rhs);');
expect(emitStmt(lhs.minus(rhs).toStmt())).toEqual('(lhs - rhs);');
expect(emitStmt(lhs.plus(rhs).toStmt())).toEqual('(lhs + rhs);');
expect(emitStmt(lhs.divide(rhs).toStmt())).toEqual('(lhs / rhs);');
expect(emitStmt(lhs.multiply(rhs).toStmt())).toEqual('(lhs * rhs);');
expect(emitStmt(lhs.modulo(rhs).toStmt())).toEqual('(lhs % rhs);');
expect(emitStmt(lhs.and(rhs).toStmt())).toEqual('(lhs && rhs);');
expect(emitStmt(lhs.or(rhs).toStmt())).toEqual('(lhs || rhs);');
expect(emitStmt(lhs.lower(rhs).toStmt())).toEqual('(lhs < rhs);');
expect(emitStmt(lhs.lowerEquals(rhs).toStmt())).toEqual('(lhs <= rhs);');
expect(emitStmt(lhs.bigger(rhs).toStmt())).toEqual('(lhs > rhs);');
expect(emitStmt(lhs.biggerEquals(rhs).toStmt())).toEqual('(lhs >= rhs);');
});
it('should support function expressions', () => {
expect(emitStmt(o.fn([], []).toStmt())).toEqual(['function() {', '};'].join('\n'));
expect(emitStmt(o.fn([], [new o.ReturnStatement(o.literal(1))]).toStmt())).toEqual([
'function() {', ' return 1;\n};'
].join('\n'));
expect(emitStmt(o.fn([new o.FnParam('param1')], []).toStmt())).toEqual([
'function(param1) {', '};'
].join('\n'));
});
it('should support function statements', () => {
expect(emitStmt(new o.DeclareFunctionStmt('someFn', [], [
]))).toEqual(['function someFn() {', '}'].join('\n'));
expect(emitStmt(new o.DeclareFunctionStmt('someFn', [], [], null, [o.StmtModifier.Exported])))
.toEqual([
'function someFn() {', '}',
`Object.defineProperty(exports, 'someFn', { get: function() { return someFn; }});`
].join('\n'));
expect(emitStmt(new o.DeclareFunctionStmt('someFn', [], [
new o.ReturnStatement(o.literal(1))
]))).toEqual(['function someFn() {', ' return 1;', '}'].join('\n'));
expect(emitStmt(new o.DeclareFunctionStmt('someFn', [new o.FnParam('param1')], [
]))).toEqual(['function someFn(param1) {', '}'].join('\n'));
});
it('should support comments', () => {
expect(emitStmt(new o.CommentStmt('a\nb'))).toEqual(['// a', '// b'].join('\n'));
});
it('should support if stmt', () => {
const trueCase = o.variable('trueCase').callFn([]).toStmt();
const falseCase = o.variable('falseCase').callFn([]).toStmt();
expect(emitStmt(new o.IfStmt(o.variable('cond'), [trueCase]))).toEqual([
'if (cond) { trueCase(); }'
].join('\n'));
expect(emitStmt(new o.IfStmt(o.variable('cond'), [trueCase], [falseCase]))).toEqual([
'if (cond) {', ' trueCase();', '} else {', ' falseCase();', '}'
].join('\n'));
});
it('should support ES5 localized strings', () => {
expect(emitStmt(new o.ExpressionStatement(o.localizedString(
{}, ['ab\\:c', 'd"e\'f'], ['ph1'],
[o.literal(7, o.NUMBER_TYPE).plus(o.literal(8, o.NUMBER_TYPE))]))))
.toEqual(
String.raw
`$localize((this&&this.__makeTemplateObject||function(e,t){return Object.defineProperty?Object.defineProperty(e,"raw",{value:t}):e.raw=t,e})(['ab\\:c', ':ph1:d"e\'f'], ['ab\\\\:c', ':ph1:d"e\'f']), (7 + 8));`);
});
it('should support try/catch', () => {
const bodyStmt = o.variable('body').callFn([]).toStmt();
const catchStmt =
o.variable('catchFn').callFn([o.CATCH_ERROR_VAR, o.CATCH_STACK_VAR]).toStmt();
expect(emitStmt(new o.TryCatchStmt([bodyStmt], [catchStmt]))).toEqual([
'try {', ' body();', '} catch (error) {', ' var stack = error.stack;',
' catchFn(error,stack);', '}'
].join('\n'));
});
it('should support support throwing',
() => { expect(emitStmt(new o.ThrowStmt(someVar))).toEqual('throw someVar;'); });
describe('classes', () => {
let callSomeMethod: o.Statement;
beforeEach(() => { callSomeMethod = o.THIS_EXPR.callMethod('someMethod', []).toStmt(); });
it('should support declaring classes', () => {
expect(emitStmt(new o.ClassStmt('SomeClass', null !, [], [], null !, [
]))).toEqual(['function SomeClass() {', '}'].join('\n'));
expect(emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [], null !, [], [o.StmtModifier.Exported])))
.toEqual([
'function SomeClass() {', '}',
`Object.defineProperty(exports, 'SomeClass', { get: function() { return SomeClass; }});`
].join('\n'));
expect(emitStmt(
new o.ClassStmt('SomeClass', o.variable('SomeSuperClass'), [], [], null !, [])))
.toEqual([
'function SomeClass() {', '}',
'SomeClass.prototype = Object.create(SomeSuperClass.prototype);'
].join('\n'));
});
it('should support declaring constructors', () => {
const superCall = o.SUPER_EXPR.callFn([o.variable('someParam')]).toStmt();
expect(emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [], new o.ClassMethod(null !, [], []), [])))
.toEqual(['function SomeClass() {', '}'].join('\n'));
expect(emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [],
new o.ClassMethod(null !, [new o.FnParam('someParam')], []), [])))
.toEqual(['function SomeClass(someParam) {', '}'].join('\n'));
expect(emitStmt(new o.ClassStmt(
'SomeClass', o.variable('SomeSuperClass'), [], [],
new o.ClassMethod(null !, [], [superCall]), [])))
.toEqual([
'function SomeClass() {', ' var self = this;',
' SomeSuperClass.call(this, someParam);', '}',
'SomeClass.prototype = Object.create(SomeSuperClass.prototype);'
].join('\n'));
expect(
emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [], new o.ClassMethod(null !, [], [callSomeMethod]), [])))
.toEqual([
'function SomeClass() {', ' var self = this;', ' self.someMethod();', '}'
].join('\n'));
});
it('should support declaring getters', () => {
expect(emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [new o.ClassGetter('someGetter', [])], null !, [])))
.toEqual([
'function SomeClass() {', '}',
`Object.defineProperty(SomeClass.prototype, 'someGetter', { get: function() {`, `}});`
].join('\n'));
expect(emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [new o.ClassGetter('someGetter', [callSomeMethod])],
null !, [])))
.toEqual([
'function SomeClass() {', '}',
`Object.defineProperty(SomeClass.prototype, 'someGetter', { get: function() {`,
` var self = this;`, ` self.someMethod();`, `}});`
].join('\n'));
});
it('should support methods', () => {
expect(emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [], null !, [new o.ClassMethod('someMethod', [], [])])))
.toEqual([
'function SomeClass() {', '}', 'SomeClass.prototype.someMethod = function() {', '};'
].join('\n'));
expect(emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [], null !,
[new o.ClassMethod('someMethod', [new o.FnParam('someParam')], [])])))
.toEqual([
'function SomeClass() {', '}',
'SomeClass.prototype.someMethod = function(someParam) {', '};'
].join('\n'));
expect(emitStmt(new o.ClassStmt(
'SomeClass', null !, [], [], null !,
[new o.ClassMethod('someMethod', [], [callSomeMethod])])))
.toEqual([
'function SomeClass() {', '}', 'SomeClass.prototype.someMethod = function() {',
' var self = this;', ' self.someMethod();', '};'
].join('\n'));
});
});
it('should support a preamble', () => {
expect(emitStmt(o.variable('a').toStmt(), '/* SomePreamble */')).toBe([
'/* SomePreamble */', 'a;'
].join('\n'));
});
});
}