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angular-docs-cn/packages/compiler-cli/test/metadata/evaluator_spec.ts

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TypeScript
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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 * as fs from 'fs';
import * as ts from 'typescript';
import {Evaluator} from '../../src/metadata/evaluator';
import {Symbols} from '../../src/metadata/symbols';
import {Directory, Host, expectNoDiagnostics, findVar, findVarInitializer} from './typescript.mocks';
describe('Evaluator', () => {
const documentRegistry = ts.createDocumentRegistry();
let host: ts.LanguageServiceHost;
let service: ts.LanguageService;
let program: ts.Program;
let typeChecker: ts.TypeChecker;
let symbols: Symbols;
let evaluator: Evaluator;
beforeEach(() => {
host = new Host(FILES, [
'expressions.ts', 'consts.ts', 'const_expr.ts', 'forwardRef.ts', 'classes.ts',
'newExpression.ts', 'errors.ts', 'declared.ts'
]);
service = ts.createLanguageService(host, documentRegistry);
program = service.getProgram();
typeChecker = program.getTypeChecker();
symbols = new Symbols(null as any as ts.SourceFile);
evaluator = new Evaluator(symbols, new Map());
});
it('should not have typescript errors in test data', () => {
expectNoDiagnostics(service.getCompilerOptionsDiagnostics());
for (const sourceFile of program.getSourceFiles()) {
expectNoDiagnostics(service.getSyntacticDiagnostics(sourceFile.fileName));
if (sourceFile.fileName != 'errors.ts') {
// Skip errors.ts because we it has intentional semantic errors that we are testing for.
expectNoDiagnostics(service.getSemanticDiagnostics(sourceFile.fileName));
}
}
});
it('should be able to fold literal expressions', () => {
const consts = program.getSourceFile('consts.ts') !;
expect(evaluator.isFoldable(findVarInitializer(consts, 'someName'))).toBeTruthy();
expect(evaluator.isFoldable(findVarInitializer(consts, 'someBool'))).toBeTruthy();
expect(evaluator.isFoldable(findVarInitializer(consts, 'one'))).toBeTruthy();
expect(evaluator.isFoldable(findVarInitializer(consts, 'two'))).toBeTruthy();
});
it('should be able to fold expressions with foldable references', () => {
const expressions = program.getSourceFile('expressions.ts') !;
symbols.define('someName', 'some-name');
symbols.define('someBool', true);
symbols.define('one', 1);
symbols.define('two', 2);
expect(evaluator.isFoldable(findVarInitializer(expressions, 'three'))).toBeTruthy();
expect(evaluator.isFoldable(findVarInitializer(expressions, 'four'))).toBeTruthy();
symbols.define('three', 3);
symbols.define('four', 4);
expect(evaluator.isFoldable(findVarInitializer(expressions, 'obj'))).toBeTruthy();
expect(evaluator.isFoldable(findVarInitializer(expressions, 'arr'))).toBeTruthy();
});
it('should be able to evaluate literal expressions', () => {
const consts = program.getSourceFile('consts.ts') !;
expect(evaluator.evaluateNode(findVarInitializer(consts, 'someName'))).toBe('some-name');
expect(evaluator.evaluateNode(findVarInitializer(consts, 'someBool'))).toBe(true);
expect(evaluator.evaluateNode(findVarInitializer(consts, 'one'))).toBe(1);
expect(evaluator.evaluateNode(findVarInitializer(consts, 'two'))).toBe(2);
});
it('should be able to evaluate expressions', () => {
const expressions = program.getSourceFile('expressions.ts') !;
symbols.define('someName', 'some-name');
symbols.define('someBool', true);
symbols.define('one', 1);
symbols.define('two', 2);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'three'))).toBe(3);
symbols.define('three', 3);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'four'))).toBe(4);
symbols.define('four', 4);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'obj')))
.toEqual({one: 1, two: 2, three: 3, four: 4});
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'arr'))).toEqual([1, 2, 3, 4]);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bTrue'))).toEqual(true);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bFalse'))).toEqual(false);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bAnd'))).toEqual(true);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bOr'))).toEqual(true);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'nDiv'))).toEqual(2);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'nMod'))).toEqual(1);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bLOr'))).toEqual(false || true);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bLAnd'))).toEqual(true && true);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bBOr'))).toEqual(0x11 | 0x22);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bBAnd'))).toEqual(0x11 & 0x03);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bXor'))).toEqual(0x11 ^ 0x21);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bEqual')))
.toEqual(1 == <any>'1');
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bNotEqual')))
.toEqual(1 != <any>'1');
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bIdentical')))
.toEqual(1 === <any>'1');
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bNotIdentical')))
.toEqual(1 !== <any>'1');
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bLessThan'))).toEqual(1 < 2);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bGreaterThan'))).toEqual(1 > 2);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bLessThanEqual')))
.toEqual(1 <= 2);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bGreaterThanEqual')))
.toEqual(1 >= 2);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bShiftLeft'))).toEqual(1 << 2);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bShiftRight'))).toEqual(-1 >> 2);
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'bShiftRightU')))
.toEqual(-1 >>> 2);
});
it('should report recursive references as symbolic', () => {
const expressions = program.getSourceFile('expressions.ts') !;
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'recursiveA')))
.toEqual({__symbolic: 'reference', name: 'recursiveB'});
expect(evaluator.evaluateNode(findVarInitializer(expressions, 'recursiveB')))
.toEqual({__symbolic: 'reference', name: 'recursiveA'});
});
it('should correctly handle special cases for CONST_EXPR', () => {
const const_expr = program.getSourceFile('const_expr.ts') !;
expect(evaluator.evaluateNode(findVarInitializer(const_expr, 'bTrue'))).toEqual(true);
expect(evaluator.evaluateNode(findVarInitializer(const_expr, 'bFalse'))).toEqual(false);
});
it('should resolve a forwardRef', () => {
const forwardRef = program.getSourceFile('forwardRef.ts') !;
expect(evaluator.evaluateNode(findVarInitializer(forwardRef, 'bTrue'))).toEqual(true);
expect(evaluator.evaluateNode(findVarInitializer(forwardRef, 'bFalse'))).toEqual(false);
});
it('should return new expressions', () => {
symbols.define('Value', {__symbolic: 'reference', module: './classes', name: 'Value'});
evaluator = new Evaluator(symbols, new Map());
const newExpression = program.getSourceFile('newExpression.ts') !;
expect(evaluator.evaluateNode(findVarInitializer(newExpression, 'someValue'))).toEqual({
__symbolic: 'new',
expression:
{__symbolic: 'reference', name: 'Value', module: './classes', line: 4, character: 33},
arguments: ['name', 12]
});
expect(evaluator.evaluateNode(findVarInitializer(newExpression, 'complex'))).toEqual({
__symbolic: 'new',
expression:
{__symbolic: 'reference', name: 'Value', module: './classes', line: 5, character: 42},
arguments: ['name', 12]
});
});
it('should support referene to a declared module type', () => {
const declared = program.getSourceFile('declared.ts') !;
const aDecl = findVar(declared, 'a') !;
expect(evaluator.evaluateNode(aDecl.type !)).toEqual({
__symbolic: 'select',
expression: {__symbolic: 'reference', name: 'Foo'},
member: 'A'
});
});
it('should return errors for unsupported expressions', () => {
const errors = program.getSourceFile('errors.ts') !;
const fDecl = findVar(errors, 'f') !;
expect(evaluator.evaluateNode(fDecl.initializer !))
.toEqual({__symbolic: 'error', message: 'Lambda not supported', line: 1, character: 12});
const eDecl = findVar(errors, 'e') !;
expect(evaluator.evaluateNode(eDecl.type !)).toEqual({
__symbolic: 'error',
message: 'Could not resolve type',
line: 2,
character: 11,
context: {typeName: 'NotFound'}
});
const sDecl = findVar(errors, 's') !;
expect(evaluator.evaluateNode(sDecl.initializer !)).toEqual({
__symbolic: 'error',
message: 'Name expected',
line: 3,
character: 14,
context: {received: '1'}
});
const tDecl = findVar(errors, 't') !;
expect(evaluator.evaluateNode(tDecl.initializer !)).toEqual({
__symbolic: 'error',
message: 'Expression form not supported',
line: 4,
character: 12
});
});
it('should be able to fold an array spread', () => {
const expressions = program.getSourceFile('expressions.ts') !;
symbols.define('arr', [1, 2, 3, 4]);
const arrSpread = findVar(expressions, 'arrSpread') !;
expect(evaluator.evaluateNode(arrSpread.initializer !)).toEqual([0, 1, 2, 3, 4, 5]);
});
it('should be able to produce a spread expression', () => {
const expressions = program.getSourceFile('expressions.ts') !;
const arrSpreadRef = findVar(expressions, 'arrSpreadRef') !;
expect(evaluator.evaluateNode(arrSpreadRef.initializer !)).toEqual([
0, {__symbolic: 'spread', expression: {__symbolic: 'reference', name: 'arrImport'}}, 5
]);
});
it('should be able to handle a new expression with no arguments', () => {
const source = sourceFileOf(`
export var a = new f;
`);
const expr = findVar(source, 'a') !;
expect(evaluator.evaluateNode(expr.initializer !))
.toEqual({__symbolic: 'new', expression: {__symbolic: 'reference', name: 'f'}});
});
describe('with substitution', () => {
let evaluator: Evaluator;
const lambdaTemp = 'lambdaTemp';
beforeEach(() => {
evaluator = new Evaluator(symbols, new Map(), {
substituteExpression: (value, node) => {
if (node.kind == ts.SyntaxKind.ArrowFunction) {
return {__symbolic: 'reference', name: lambdaTemp};
}
return value;
}
});
});
it('should be able to substitute a lambda with a reference', () => {
const source = sourceFileOf(`
var b = 1;
export var a = () => b;
`);
const expr = findVar(source, 'a');
expect(evaluator.evaluateNode(expr !.initializer !))
.toEqual({__symbolic: 'reference', name: lambdaTemp});
});
it('should be able to substitute a lambda in an expression', () => {
const source = sourceFileOf(`
var b = 1;
export var a = [
{ provide: 'someValue': useFactory: () => b }
];
`);
const expr = findVar(source, 'a');
expect(evaluator.evaluateNode(expr !.initializer !)).toEqual([
{provide: 'someValue', useFactory: {__symbolic: 'reference', name: lambdaTemp}}
]);
});
});
});
function sourceFileOf(text: string): ts.SourceFile {
return ts.createSourceFile('test.ts', text, ts.ScriptTarget.Latest, true);
}
const FILES: Directory = {
'directives.ts': `
export function Pipe(options: { name?: string, pure?: boolean}) {
return function(fn: Function) { }
}
`,
'classes.ts': `
export class Value {
constructor(public name: string, public value: any) {}
}
`,
'consts.ts': `
export var someName = 'some-name';
export var someBool = true;
export var one = 1;
export var two = 2;
export var arrImport = [1, 2, 3, 4];
`,
'expressions.ts': `
import {arrImport} from './consts';
export var someName = 'some-name';
export var someBool = true;
export var one = 1;
export var two = 2;
export var three = one + two;
export var four = two * two;
export var obj = { one: one, two: two, three: three, four: four };
export var arr = [one, two, three, four];
export var bTrue = someBool;
export var bFalse = !someBool;
export var bAnd = someBool && someBool;
export var bOr = someBool || someBool;
export var nDiv = four / two;
export var nMod = (four + one) % two;
export var bLOr = false || true; // true
export var bLAnd = true && true; // true
export var bBOr = 0x11 | 0x22; // 0x33
export var bBAnd = 0x11 & 0x03; // 0x01
export var bXor = 0x11 ^ 0x21; // 0x20
export var bEqual = 1 == <any>"1"; // true
export var bNotEqual = 1 != <any>"1"; // false
export var bIdentical = 1 === <any>"1"; // false
export var bNotIdentical = 1 !== <any>"1"; // true
export var bLessThan = 1 < 2; // true
export var bGreaterThan = 1 > 2; // false
export var bLessThanEqual = 1 <= 2; // true
export var bGreaterThanEqual = 1 >= 2; // false
export var bShiftLeft = 1 << 2; // 0x04
export var bShiftRight = -1 >> 2; // -1
export var bShiftRightU = -1 >>> 2; // 0x3fffffff
export var arrSpread = [0, ...arr, 5];
export var arrSpreadRef = [0, ...arrImport, 5];
export var recursiveA = recursiveB;
export var recursiveB = recursiveA;
`,
'A.ts': `
import {Pipe} from './directives';
@Pipe({name: 'A', pure: false})
export class A {}`,
'B.ts': `
import {Pipe} from './directives';
import {someName, someBool} from './consts';
@Pipe({name: someName, pure: someBool})
export class B {}`,
'const_expr.ts': `
function CONST_EXPR(value: any) { return value; }
export var bTrue = CONST_EXPR(true);
export var bFalse = CONST_EXPR(false);
`,
'forwardRef.ts': `
function forwardRef(value: any) { return value; }
export var bTrue = forwardRef(() => true);
export var bFalse = forwardRef(() => false);
`,
'newExpression.ts': `
import {Value} from './classes';
function CONST_EXPR(value: any) { return value; }
function forwardRef(value: any) { return value; }
export const someValue = new Value("name", 12);
export const complex = CONST_EXPR(new Value("name", forwardRef(() => 12)));
`,
'errors.ts': `
let f = () => 1;
let e: NotFound;
let s = { 1: 1, 2: 2 };
let t = typeof 12;
`,
'declared.ts': `
declare namespace Foo {
type A = string;
}
let a: Foo.A = 'some value';
`
};
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