angular-docs-cn/packages/compiler-cli/linker/test/ast/ast_value_spec.ts

/**
 * @license
 * Copyright Google LLC 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 {WrappedNodeExpr} from '@angular/compiler';
import {TypeScriptAstFactory} from '@angular/compiler-cli/src/ngtsc/translator';
import * as ts from 'typescript';

import {AstObject, AstValue} from '../../src/ast/ast_value';
import {TypeScriptAstHost} from '../../src/ast/typescript/typescript_ast_host';

const host = new TypeScriptAstHost();
const factory = new TypeScriptAstFactory();
const nestedObj = factory.createObjectLiteral([
  {propertyName: 'x', quoted: false, value: factory.createLiteral(42)},
  {propertyName: 'y', quoted: false, value: factory.createLiteral('X')},
]);
const nestedArray =
    factory.createArrayLiteral([factory.createLiteral(1), factory.createLiteral(2)]);
const obj = AstObject.parse(
    factory.createObjectLiteral([
      {propertyName: 'a', quoted: false, value: factory.createLiteral(42)},
      {propertyName: 'b', quoted: false, value: factory.createLiteral('X')},
      {propertyName: 'c', quoted: false, value: factory.createLiteral(true)},
      {propertyName: 'd', quoted: false, value: nestedObj},
      {propertyName: 'e', quoted: false, value: nestedArray},
    ]),
    host);

describe('AstObject', () => {
  describe('has()', () => {
    it('should return true if the property exists on the object', () => {
      expect(obj.has('a')).toBe(true);
      expect(obj.has('b')).toBe(true);
      expect(obj.has('z')).toBe(false);
    });
  });

  describe('getNumber()', () => {
    it('should return the number value of the property', () => {
      expect(obj.getNumber('a')).toEqual(42);
    });

    it('should throw an error if the property is not a number', () => {
      expect(() => obj.getNumber('b'))
          .toThrowError('Unsupported syntax, expected a numeric literal.');
    });
  });

  describe('getString()', () => {
    it('should return the string value of the property', () => {
      expect(obj.getString('b')).toEqual('X');
    });

    it('should throw an error if the property is not a string', () => {
      expect(() => obj.getString('a'))
          .toThrowError('Unsupported syntax, expected a string literal.');
    });
  });

  describe('getBoolean()', () => {
    it('should return the boolean value of the property', () => {
      expect(obj.getBoolean('c')).toEqual(true);
    });

    it('should throw an error if the property is not a boolean', () => {
      expect(() => obj.getBoolean('b'))
          .toThrowError('Unsupported syntax, expected a boolean literal.');
    });
  });

  describe('getObject()', () => {
    it('should return an AstObject instance parsed from the value of the property', () => {
      expect(obj.getObject('d')).toEqual(AstObject.parse(nestedObj, host));
    });

    it('should throw an error if the property is not an object expression', () => {
      expect(() => obj.getObject('b'))
          .toThrowError('Unsupported syntax, expected an object literal.');
    });
  });

  describe('getArray()', () => {
    it('should return an array of AstValue instances of parsed from the value of the property',
       () => {
         expect(obj.getArray('e')).toEqual([
           new AstValue(factory.createLiteral(1), host),
           new AstValue(factory.createLiteral(2), host)
         ]);
       });

    it('should throw an error if the property is not an array of expressions', () => {
      expect(() => obj.getArray('b'))
          .toThrowError('Unsupported syntax, expected an array literal.');
    });
  });

  describe('getOpaque()', () => {
    it('should return the expression value of the property wrapped in a `WrappedNodeExpr`', () => {
      expect(obj.getOpaque('d')).toEqual(jasmine.any(WrappedNodeExpr));
      expect(obj.getOpaque('d').node).toEqual(obj.getNode('d'));
    });

    it('should throw an error if the property does not exist', () => {
      expect(() => obj.getOpaque('x')).toThrowError('Expected property \'x\' to be present.');
    });
  });

  describe('getNode()', () => {
    it('should return the original expression value of the property', () => {
      expect(obj.getNode('a')).toEqual(factory.createLiteral(42));
    });

    it('should throw an error if the property does not exist', () => {
      expect(() => obj.getNode('x')).toThrowError('Expected property \'x\' to be present.');
    });
  });

  describe('getValue()', () => {
    it('should return the expression value of the property wrapped in an `AstValue`', () => {
      expect(obj.getValue('a')).toEqual(jasmine.any(AstValue));
      expect(obj.getValue('a').getNumber()).toEqual(42);
    });

    it('should throw an error if the property does not exist', () => {
      expect(() => obj.getValue('x')).toThrowError('Expected property \'x\' to be present.');
    });
  });

  describe('toLiteral()', () => {
    it('should convert the AstObject to a raw object with each property mapped', () => {
      expect(obj.toLiteral(value => value.getOpaque())).toEqual({
        a: obj.getOpaque('a'),
        b: obj.getOpaque('b'),
        c: obj.getOpaque('c'),
        d: obj.getOpaque('d'),
        e: obj.getOpaque('e'),
      });
    });
  });
});

describe('AstValue', () => {
  describe('isNumber', () => {
    it('should return true if the value is a number', () => {
      expect(new AstValue(factory.createLiteral(42), host).isNumber()).toEqual(true);
    });

    it('should return false if the value is not a number', () => {
      expect(new AstValue(factory.createLiteral('a'), host).isNumber()).toEqual(false);
    });
  });

  describe('getNumber', () => {
    it('should return the number value of the AstValue', () => {
      expect(new AstValue(factory.createLiteral(42), host).getNumber()).toEqual(42);
    });

    it('should throw an error if the property is not a number', () => {
      expect(() => new AstValue(factory.createLiteral('a'), host).getNumber())
          .toThrowError('Unsupported syntax, expected a numeric literal.');
    });
  });

  describe('isString', () => {
    it('should return true if the value is a string', () => {
      expect(new AstValue(factory.createLiteral('a'), host).isString()).toEqual(true);
    });

    it('should return false if the value is not a string', () => {
      expect(new AstValue(factory.createLiteral(42), host).isString()).toEqual(false);
    });
  });

  describe('getString', () => {
    it('should return the string value of the AstValue', () => {
      expect(new AstValue(factory.createLiteral('X'), host).getString()).toEqual('X');
    });

    it('should throw an error if the property is not a string', () => {
      expect(() => new AstValue(factory.createLiteral(42), host).getString())
          .toThrowError('Unsupported syntax, expected a string literal.');
    });
  });

  describe('isBoolean', () => {
    it('should return true if the value is a boolean', () => {
      expect(new AstValue(factory.createLiteral(true), host).isBoolean()).toEqual(true);
    });

    it('should return false if the value is not a boolean', () => {
      expect(new AstValue(factory.createLiteral(42), host).isBoolean()).toEqual(false);
    });
  });

  describe('getBoolean', () => {
    it('should return the boolean value of the AstValue', () => {
      expect(new AstValue(factory.createLiteral(true), host).getBoolean()).toEqual(true);
    });

    it('should throw an error if the property is not a boolean', () => {
      expect(() => new AstValue(factory.createLiteral(42), host).getBoolean())
          .toThrowError('Unsupported syntax, expected a boolean literal.');
    });
  });

  describe('isObject', () => {
    it('should return true if the value is an object literal', () => {
      expect(new AstValue(nestedObj, host).isObject()).toEqual(true);
    });

    it('should return false if the value is not an object literal', () => {
      expect(new AstValue(factory.createLiteral(42), host).isObject()).toEqual(false);
    });
  });

  describe('getObject', () => {
    it('should return the AstObject value of the AstValue', () => {
      expect(new AstValue(nestedObj, host).getObject()).toEqual(AstObject.parse(nestedObj, host));
    });

    it('should throw an error if the property is not an object literal', () => {
      expect(() => new AstValue(factory.createLiteral(42), host).getObject())
          .toThrowError('Unsupported syntax, expected an object literal.');
    });
  });

  describe('isArray', () => {
    it('should return true if the value is an array literal', () => {
      expect(new AstValue(nestedArray, host).isArray()).toEqual(true);
    });

    it('should return false if the value is not an object literal', () => {
      expect(new AstValue(factory.createLiteral(42), host).isArray()).toEqual(false);
    });
  });

  describe('getArray', () => {
    it('should return an array of AstValue objects from the AstValue', () => {
      expect(new AstValue(nestedArray, host).getArray()).toEqual([
        new AstValue(factory.createLiteral(1), host),
        new AstValue(factory.createLiteral(2), host),
      ]);
    });

    it('should throw an error if the property is not an array', () => {
      expect(() => new AstValue(factory.createLiteral(42), host).getArray())
          .toThrowError('Unsupported syntax, expected an array literal.');
    });
  });

  describe('isFunction', () => {
    it('should return true if the value is a function expression', () => {
      const funcExpr = factory.createFunctionExpression(
          'foo', [],
          factory.createBlock([factory.createReturnStatement(factory.createLiteral(42))]));
      expect(new AstValue(funcExpr, host).isFunction()).toEqual(true);
    });

    it('should return false if the value is not a function expression', () => {
      expect(new AstValue(factory.createLiteral(42), host).isFunction()).toEqual(false);
    });
  });

  describe('getFunctionReturnValue', () => {
    it('should return the "return value" of the function expression', () => {
      const funcExpr = factory.createFunctionExpression(
          'foo', [],
          factory.createBlock([factory.createReturnStatement(factory.createLiteral(42))]));
      expect(new AstValue(funcExpr, host).getFunctionReturnValue())
          .toEqual(new AstValue(factory.createLiteral(42), host));
    });

    it('should throw an error if the property is not a function expression', () => {
      expect(() => new AstValue(factory.createLiteral(42), host).getFunctionReturnValue())
          .toThrowError('Unsupported syntax, expected a function.');
    });

    it('should throw an error if the property is a function expression with no return value',
       () => {
         const funcExpr = factory.createFunctionExpression(
             'foo', [], factory.createBlock([factory.createExpressionStatement(
                            factory.createLiteral('do nothing'))]));
         expect(() => new AstValue(funcExpr, host).getFunctionReturnValue())
             .toThrowError(
                 'Unsupported syntax, expected a function body with a single return statement.');
       });
  });

  describe('getOpaque()', () => {
    it('should return the value wrapped in a `WrappedNodeExpr`', () => {
      expect(new AstValue(factory.createLiteral(42), host).getOpaque())
          .toEqual(jasmine.any(WrappedNodeExpr));
      expect(new AstValue(factory.createLiteral(42), host).getOpaque().node)
          .toEqual(factory.createLiteral(42));
    });
  });

  describe('getRange()', () => {
    it('should return the source range of the AST node', () => {
      const file = ts.createSourceFile(
          'test.ts', '// preamble\nx = \'moo\';', ts.ScriptTarget.ES2015,
          /* setParentNodes */ true);

      // Grab the `'moo'` string literal from the generated AST
      const stmt = file.statements[0] as ts.ExpressionStatement;
      const mooString =
          (stmt.expression as ts.AssignmentExpression<ts.Token<ts.SyntaxKind.EqualsToken>>).right;

      // Check that this string literal has the expected range.
      expect(new AstValue(mooString, host).getRange())
          .toEqual({startLine: 1, startCol: 4, startPos: 16, endPos: 21});
    });
  });
});