refactor(compiler-cli): implement BabelAstFactory and AstHosts (#38866)
This commit adds the `AstHost` interface, along with implementations for both Babel and TS. It also implements the Babel vesion of the `AstFactory` interface, along with a linker specific implementation of the `ImportGenerator` interface. These classes will be used by the new "ng-linker" to transform prelinked library code using a Babel plugin. PR Close #38866
This commit is contained in:
Pete Bacon Darwin
committed by
Joey Perrott
Joey Perrott
parent
1f5d7dc394
commit
7dd0db6d4f
@ -0,0 +1,382 @@
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/**
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* @license
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* Copyright Google LLC 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 {leadingComment} from '@angular/compiler';
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import generate from '@babel/generator';
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import {expression, statement} from '@babel/template';
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import * as t from '@babel/types';
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import {BabelAstFactory} from '../../../src/ast/babel/babel_ast_factory';
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describe('BabelAstFactory', () => {
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let factory: BabelAstFactory;
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beforeEach(() => factory = new BabelAstFactory());
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describe('attachComments()', () => {
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it('should add the comments to the given statement', () => {
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const stmt = statement.ast`x = 10;`;
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factory.attachComments(
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stmt, [leadingComment('comment 1', true), leadingComment('comment 2', false)]);
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expect(generate(stmt).code).toEqual([
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'/* comment 1 */',
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'//comment 2',
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'x = 10;',
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].join('\n'));
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});
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});
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describe('createArrayLiteral()', () => {
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it('should create an array node containing the provided expressions', () => {
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const expr1 = expression.ast`42`;
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const expr2 = expression.ast`"moo"`;
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const array = factory.createArrayLiteral([expr1, expr2]);
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expect(generate(array).code).toEqual('[42, "moo"]');
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});
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});
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describe('createAssignment()', () => {
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it('should create an assignment node using the target and value expressions', () => {
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const target = expression.ast`x`;
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const value = expression.ast`42`;
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const assignment = factory.createAssignment(target, value);
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expect(generate(assignment).code).toEqual('x = 42');
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});
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});
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describe('createBinaryExpression()', () => {
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it('should create a binary operation node using the left and right expressions', () => {
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const left = expression.ast`17`;
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const right = expression.ast`42`;
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const expr = factory.createBinaryExpression(left, '+', right);
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expect(generate(expr).code).toEqual('17 + 42');
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});
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it('should create a binary operation node for logical operators', () => {
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const left = expression.ast`17`;
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const right = expression.ast`42`;
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const expr = factory.createBinaryExpression(left, '&&', right);
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expect(t.isLogicalExpression(expr)).toBe(true);
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expect(generate(expr).code).toEqual('17 && 42');
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});
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});
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describe('createBlock()', () => {
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it('should create a block statement containing the given statements', () => {
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const stmt1 = statement.ast`x = 10`;
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const stmt2 = statement.ast`y = 20`;
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const block = factory.createBlock([stmt1, stmt2]);
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expect(generate(block).code).toEqual([
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'{',
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' x = 10;',
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' y = 20;',
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'}',
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].join('\n'));
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});
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});
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describe('createCallExpression()', () => {
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it('should create a call on the `callee` with the given `args`', () => {
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const callee = expression.ast`foo`;
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const arg1 = expression.ast`42`;
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const arg2 = expression.ast`"moo"`;
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const call = factory.createCallExpression(callee, [arg1, arg2], false);
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expect(generate(call).code).toEqual('foo(42, "moo")');
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});
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it('should create a call marked with a PURE comment if `pure` is true', () => {
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const callee = expression.ast`foo`;
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const arg1 = expression.ast`42`;
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const arg2 = expression.ast`"moo"`;
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const call = factory.createCallExpression(callee, [arg1, arg2], true);
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expect(generate(call).code).toEqual(['/* @__PURE__ */', 'foo(42, "moo")'].join('\n'));
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});
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});
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describe('createConditional()', () => {
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it('should create a condition expression', () => {
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const test = expression.ast`!test`;
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const thenExpr = expression.ast`42`;
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const elseExpr = expression.ast`"moo"`;
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const conditional = factory.createConditional(test, thenExpr, elseExpr);
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expect(generate(conditional).code).toEqual('!test ? 42 : "moo"');
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});
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});
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describe('createElementAccess()', () => {
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it('should create an expression accessing the element of an array/object', () => {
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const expr = expression.ast`obj`;
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const element = expression.ast`"moo"`;
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const access = factory.createElementAccess(expr, element);
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expect(generate(access).code).toEqual('obj["moo"]');
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});
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});
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describe('createExpressionStatement()', () => {
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it('should create a statement node from the given expression', () => {
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const expr = expression.ast`x = 10`;
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const stmt = factory.createExpressionStatement(expr);
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expect(t.isStatement(stmt)).toBe(true);
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expect(generate(stmt).code).toEqual('x = 10;');
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});
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});
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describe('createFunctionDeclaration()', () => {
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it('should create a function declaration node with the given name, parameters and body statements',
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() => {
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const stmts = statement.ast`{x = 10; y = 20;}`;
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const fn = factory.createFunctionDeclaration('foo', ['arg1', 'arg2'], stmts);
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expect(generate(fn).code).toEqual([
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'function foo(arg1, arg2) {',
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' x = 10;',
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' y = 20;',
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'}',
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].join('\n'));
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});
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});
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describe('createFunctionExpression()', () => {
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it('should create a function expression node with the given name, parameters and body statements',
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() => {
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const stmts = statement.ast`{x = 10; y = 20;}`;
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const fn = factory.createFunctionExpression('foo', ['arg1', 'arg2'], stmts);
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expect(t.isStatement(fn)).toBe(false);
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expect(generate(fn).code).toEqual([
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'function foo(arg1, arg2) {',
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' x = 10;',
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' y = 20;',
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'}',
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].join('\n'));
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});
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it('should create an anonymous function expression node if the name is null', () => {
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const stmts = statement.ast`{x = 10; y = 20;}`;
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const fn = factory.createFunctionExpression(null, ['arg1', 'arg2'], stmts);
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expect(generate(fn).code).toEqual([
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'function (arg1, arg2) {',
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' x = 10;',
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' y = 20;',
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'}',
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].join('\n'));
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});
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});
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describe('createIdentifier()', () => {
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it('should create an identifier with the given name', () => {
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const id = factory.createIdentifier('someId') as t.Identifier;
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expect(t.isIdentifier(id)).toBe(true);
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expect(id.name).toEqual('someId');
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});
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});
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describe('createIfStatement()', () => {
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it('should create an if-else statement', () => {
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const test = expression.ast`!test`;
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const thenStmt = statement.ast`x = 10;`;
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const elseStmt = statement.ast`x = 42;`;
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const ifStmt = factory.createIfStatement(test, thenStmt, elseStmt);
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expect(generate(ifStmt).code).toEqual('if (!test) x = 10;else x = 42;');
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});
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it('should create an if statement if the else expression is null', () => {
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const test = expression.ast`!test`;
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const thenStmt = statement.ast`x = 10;`;
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const ifStmt = factory.createIfStatement(test, thenStmt, null);
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expect(generate(ifStmt).code).toEqual('if (!test) x = 10;');
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});
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});
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describe('createLiteral()', () => {
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it('should create a string literal', () => {
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const literal = factory.createLiteral('moo');
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expect(t.isStringLiteral(literal)).toBe(true);
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expect(generate(literal).code).toEqual('"moo"');
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});
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it('should create a number literal', () => {
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const literal = factory.createLiteral(42);
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expect(t.isNumericLiteral(literal)).toBe(true);
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expect(generate(literal).code).toEqual('42');
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});
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it('should create a number literal for `NaN`', () => {
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const literal = factory.createLiteral(NaN);
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expect(t.isNumericLiteral(literal)).toBe(true);
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expect(generate(literal).code).toEqual('NaN');
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});
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it('should create a boolean literal', () => {
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const literal = factory.createLiteral(true);
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expect(t.isBooleanLiteral(literal)).toBe(true);
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expect(generate(literal).code).toEqual('true');
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});
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it('should create an `undefined` literal', () => {
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const literal = factory.createLiteral(undefined);
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expect(t.isIdentifier(literal)).toBe(true);
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expect(generate(literal).code).toEqual('undefined');
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});
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it('should create a null literal', () => {
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const literal = factory.createLiteral(null);
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expect(t.isNullLiteral(literal)).toBe(true);
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expect(generate(literal).code).toEqual('null');
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});
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});
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describe('createNewExpression()', () => {
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it('should create a `new` operation on the constructor `expression` with the given `args`',
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() => {
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const expr = expression.ast`Foo`;
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const arg1 = expression.ast`42`;
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const arg2 = expression.ast`"moo"`;
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const call = factory.createNewExpression(expr, [arg1, arg2]);
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expect(generate(call).code).toEqual('new Foo(42, "moo")');
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});
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});
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describe('createObjectLiteral()', () => {
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it('should create an object literal node, with the given properties', () => {
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const prop1 = expression.ast`42`;
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const prop2 = expression.ast`"moo"`;
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const obj = factory.createObjectLiteral([
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{propertyName: 'prop1', value: prop1, quoted: false},
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{propertyName: 'prop2', value: prop2, quoted: true},
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]);
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expect(generate(obj).code).toEqual([
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'{',
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' prop1: 42,',
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' "prop2": "moo"',
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'}',
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].join('\n'));
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});
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});
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describe('createParenthesizedExpression()', () => {
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it('should add parentheses around the given expression', () => {
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const expr = expression.ast`a + b`;
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const paren = factory.createParenthesizedExpression(expr);
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expect(generate(paren).code).toEqual('(a + b)');
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});
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});
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describe('createPropertyAccess()', () => {
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it('should create a property access expression node', () => {
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const expr = expression.ast`obj`;
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const access = factory.createPropertyAccess(expr, 'moo');
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expect(generate(access).code).toEqual('obj.moo');
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});
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});
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describe('createReturnStatement()', () => {
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it('should create a return statement returning the given expression', () => {
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const expr = expression.ast`42`;
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const returnStmt = factory.createReturnStatement(expr);
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expect(generate(returnStmt).code).toEqual('return 42;');
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});
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it('should create a void return statement if the expression is null', () => {
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const returnStmt = factory.createReturnStatement(null);
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expect(generate(returnStmt).code).toEqual('return;');
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});
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});
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describe('createTaggedTemplate()', () => {
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it('should create a tagged template node from the tag, elements and expressions', () => {
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const elements = [
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{raw: 'raw1', cooked: 'cooked1', range: null},
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{raw: 'raw2', cooked: 'cooked2', range: null},
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{raw: 'raw3', cooked: 'cooked3', range: null},
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];
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const expressions = [
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expression.ast`42`,
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expression.ast`"moo"`,
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];
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const tag = expression.ast`tagFn`;
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const template = factory.createTaggedTemplate(tag, {elements, expressions});
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expect(generate(template).code).toEqual('tagFn`raw1${42}raw2${"moo"}raw3`');
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});
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});
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describe('createThrowStatement()', () => {
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it('should create a throw statement, throwing the given expression', () => {
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const expr = expression.ast`new Error("bad")`;
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const throwStmt = factory.createThrowStatement(expr);
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expect(generate(throwStmt).code).toEqual('throw new Error("bad");');
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});
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});
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describe('createTypeOfExpression()', () => {
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it('should create a typeof expression node', () => {
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const expr = expression.ast`42`;
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const typeofExpr = factory.createTypeOfExpression(expr);
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expect(generate(typeofExpr).code).toEqual('typeof 42');
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});
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});
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describe('createUnaryExpression()', () => {
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it('should create a unary expression with the operator and operand', () => {
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const expr = expression.ast`value`;
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const unaryExpr = factory.createUnaryExpression('!', expr);
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expect(generate(unaryExpr).code).toEqual('!value');
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});
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});
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describe('createVariableDeclaration()', () => {
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it('should create a variable declaration statement node for the given variable name and initializer',
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() => {
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const initializer = expression.ast`42`;
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const varDecl = factory.createVariableDeclaration('foo', initializer, 'let');
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expect(generate(varDecl).code).toEqual('let foo = 42;');
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});
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it('should create a constant declaration statement node for the given variable name and initializer',
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() => {
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const initializer = expression.ast`42`;
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const varDecl = factory.createVariableDeclaration('foo', initializer, 'const');
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expect(generate(varDecl).code).toEqual('const foo = 42;');
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});
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it('should create a downleveled variable declaration statement node for the given variable name and initializer',
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() => {
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const initializer = expression.ast`42`;
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const varDecl = factory.createVariableDeclaration('foo', initializer, 'var');
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expect(generate(varDecl).code).toEqual('var foo = 42;');
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});
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it('should create an uninitialized variable declaration statement node for the given variable name and a null initializer',
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() => {
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const varDecl = factory.createVariableDeclaration('foo', null, 'let');
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expect(generate(varDecl).code).toEqual('let foo;');
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});
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});
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describe('setSourceMapRange()', () => {
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it('should attach the `sourceMapRange` to the given `node`', () => {
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const expr = expression.ast`42`;
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expect(expr.loc).toBeUndefined();
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expect(expr.start).toBeUndefined();
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expect(expr.end).toBeUndefined();
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factory.setSourceMapRange(expr, {
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start: {line: 0, column: 1, offset: 1},
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end: {line: 2, column: 3, offset: 15},
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content: '-****\n*****\n****',
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url: 'original.ts'
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});
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// Lines are 1-based in Babel.
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expect(expr.loc).toEqual({
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start: {line: 1, column: 1},
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end: {line: 3, column: 3},
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});
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expect(expr.start).toEqual(1);
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expect(expr.end).toEqual(15);
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});
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});
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});
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@ -0,0 +1,305 @@
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/**
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* @license
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* Copyright Google LLC 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 * as t from '@babel/types';
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import template from '@babel/template';
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import {parse} from '@babel/parser';
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import {BabelAstHost} from '../../../src/ast/babel/babel_ast_host';
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describe('BabelAstHost', () => {
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let host: BabelAstHost;
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beforeEach(() => host = new BabelAstHost());
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describe('getSymbolName()', () => {
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it('should return the name of an identifier', () => {
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expect(host.getSymbolName(expr('someIdentifier'))).toEqual('someIdentifier');
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});
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it('should return the name of an identifier at the end of a property access chain', () => {
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expect(host.getSymbolName(expr('a.b.c.someIdentifier'))).toEqual('someIdentifier');
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});
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it('should return null if the expression has no identifier', () => {
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expect(host.getSymbolName(expr('42'))).toBe(null);
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});
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});
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describe('isStringLiteral()', () => {
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it('should return true if the expression is a string literal', () => {
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expect(host.isStringLiteral(expr('"moo"'))).toBe(true);
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expect(host.isStringLiteral(expr('\'moo\''))).toBe(true);
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});
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it('should return false if the expression is not a string literal', () => {
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expect(host.isStringLiteral(expr('true'))).toBe(false);
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expect(host.isStringLiteral(expr('someIdentifier'))).toBe(false);
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expect(host.isStringLiteral(expr('42'))).toBe(false);
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expect(host.isStringLiteral(expr('{}'))).toBe(false);
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expect(host.isStringLiteral(expr('[]'))).toBe(false);
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expect(host.isStringLiteral(expr('null'))).toBe(false);
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expect(host.isStringLiteral(expr('\'a\' + \'b\''))).toBe(false);
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});
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it('should return false if the expression is a template string', () => {
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expect(host.isStringLiteral(expr('\`moo\`'))).toBe(false);
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});
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});
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describe('parseStringLiteral()', () => {
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it('should extract the string value', () => {
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expect(host.parseStringLiteral(expr('"moo"'))).toEqual('moo');
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expect(host.parseStringLiteral(expr('\'moo\''))).toEqual('moo');
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});
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it('should error if the value is not a string literal', () => {
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expect(() => host.parseStringLiteral(expr('42')))
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.toThrowError('Unsupported syntax, expected a string literal.');
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});
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});
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describe('isNumericLiteral()', () => {
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it('should return true if the expression is a number literal', () => {
|
||||
expect(host.isNumericLiteral(expr('42'))).toBe(true);
|
||||
});
|
||||
|
||||
it('should return false if the expression is not a number literal', () => {
|
||||
expect(host.isStringLiteral(expr('true'))).toBe(false);
|
||||
expect(host.isNumericLiteral(expr('"moo"'))).toBe(false);
|
||||
expect(host.isNumericLiteral(expr('\'moo\''))).toBe(false);
|
||||
expect(host.isNumericLiteral(expr('someIdentifier'))).toBe(false);
|
||||
expect(host.isNumericLiteral(expr('{}'))).toBe(false);
|
||||
expect(host.isNumericLiteral(expr('[]'))).toBe(false);
|
||||
expect(host.isNumericLiteral(expr('null'))).toBe(false);
|
||||
expect(host.isNumericLiteral(expr('\'a\' + \'b\''))).toBe(false);
|
||||
expect(host.isNumericLiteral(expr('\`moo\`'))).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe('parseNumericLiteral()', () => {
|
||||
it('should extract the number value', () => {
|
||||
expect(host.parseNumericLiteral(expr('42'))).toEqual(42);
|
||||
});
|
||||
|
||||
it('should error if the value is not a numeric literal', () => {
|
||||
expect(() => host.parseNumericLiteral(expr('"moo"')))
|
||||
.toThrowError('Unsupported syntax, expected a numeric literal.');
|
||||
});
|
||||
});
|
||||
|
||||
describe('isBooleanLiteral()', () => {
|
||||
it('should return true if the expression is a boolean literal', () => {
|
||||
expect(host.isBooleanLiteral(expr('true'))).toBe(true);
|
||||
expect(host.isBooleanLiteral(expr('false'))).toBe(true);
|
||||
});
|
||||
|
||||
it('should return false if the expression is not a boolean literal', () => {
|
||||
expect(host.isBooleanLiteral(expr('"moo"'))).toBe(false);
|
||||
expect(host.isBooleanLiteral(expr('\'moo\''))).toBe(false);
|
||||
expect(host.isBooleanLiteral(expr('someIdentifier'))).toBe(false);
|
||||
expect(host.isBooleanLiteral(expr('42'))).toBe(false);
|
||||
expect(host.isBooleanLiteral(expr('{}'))).toBe(false);
|
||||
expect(host.isBooleanLiteral(expr('[]'))).toBe(false);
|
||||
expect(host.isBooleanLiteral(expr('null'))).toBe(false);
|
||||
expect(host.isBooleanLiteral(expr('\'a\' + \'b\''))).toBe(false);
|
||||
expect(host.isBooleanLiteral(expr('\`moo\`'))).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe('parseBooleanLiteral()', () => {
|
||||
it('should extract the boolean value', () => {
|
||||
expect(host.parseBooleanLiteral(expr('true'))).toEqual(true);
|
||||
expect(host.parseBooleanLiteral(expr('false'))).toEqual(false);
|
||||
});
|
||||
|
||||
it('should error if the value is not a boolean literal', () => {
|
||||
expect(() => host.parseBooleanLiteral(expr('"moo"')))
|
||||
.toThrowError('Unsupported syntax, expected a boolean literal.');
|
||||
});
|
||||
});
|
||||
|
||||
describe('isArrayLiteral()', () => {
|
||||
it('should return true if the expression is an array literal', () => {
|
||||
expect(host.isArrayLiteral(expr('[]'))).toBe(true);
|
||||
expect(host.isArrayLiteral(expr('[1, 2, 3]'))).toBe(true);
|
||||
expect(host.isArrayLiteral(expr('[[], []]'))).toBe(true);
|
||||
});
|
||||
|
||||
it('should return false if the expression is not an array literal', () => {
|
||||
expect(host.isArrayLiteral(expr('"moo"'))).toBe(false);
|
||||
expect(host.isArrayLiteral(expr('\'moo\''))).toBe(false);
|
||||
expect(host.isArrayLiteral(expr('someIdentifier'))).toBe(false);
|
||||
expect(host.isArrayLiteral(expr('42'))).toBe(false);
|
||||
expect(host.isArrayLiteral(expr('{}'))).toBe(false);
|
||||
expect(host.isArrayLiteral(expr('null'))).toBe(false);
|
||||
expect(host.isArrayLiteral(expr('\'a\' + \'b\''))).toBe(false);
|
||||
expect(host.isArrayLiteral(expr('\`moo\`'))).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe('parseArrayLiteral()', () => {
|
||||
it('should extract the expressions in the array', () => {
|
||||
const moo = expr('\'moo\'');
|
||||
expect(host.parseArrayLiteral(expr('[]'))).toEqual([]);
|
||||
expect(host.parseArrayLiteral(expr('[\'moo\']'))).toEqual([moo]);
|
||||
});
|
||||
|
||||
it('should error if there is an empty item', () => {
|
||||
expect(() => host.parseArrayLiteral(expr('[,]')))
|
||||
.toThrowError('Unsupported syntax, expected element in array not to be empty.');
|
||||
});
|
||||
|
||||
it('should error if there is a spread element', () => {
|
||||
expect(() => host.parseArrayLiteral(expr('[...[0,1]]')))
|
||||
.toThrowError('Unsupported syntax, expected element in array not to use spread syntax.');
|
||||
});
|
||||
});
|
||||
|
||||
describe('isObjectLiteral()', () => {
|
||||
it('should return true if the expression is an object literal', () => {
|
||||
expect(host.isObjectLiteral(rhs('x = {}'))).toBe(true);
|
||||
expect(host.isObjectLiteral(rhs('x = { foo: \'bar\' }'))).toBe(true);
|
||||
});
|
||||
|
||||
it('should return false if the expression is not an object literal', () => {
|
||||
expect(host.isObjectLiteral(rhs('x = "moo"'))).toBe(false);
|
||||
expect(host.isObjectLiteral(rhs('x = \'moo\''))).toBe(false);
|
||||
expect(host.isObjectLiteral(rhs('x = someIdentifier'))).toBe(false);
|
||||
expect(host.isObjectLiteral(rhs('x = 42'))).toBe(false);
|
||||
expect(host.isObjectLiteral(rhs('x = []'))).toBe(false);
|
||||
expect(host.isObjectLiteral(rhs('x = null'))).toBe(false);
|
||||
expect(host.isObjectLiteral(rhs('x = \'a\' + \'b\''))).toBe(false);
|
||||
expect(host.isObjectLiteral(rhs('x = \`moo\`'))).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe('parseObjectLiteral()', () => {
|
||||
it('should extract the properties from the object', () => {
|
||||
const moo = expr('\'moo\'');
|
||||
expect(host.parseObjectLiteral(rhs('x = {}'))).toEqual(new Map());
|
||||
expect(host.parseObjectLiteral(rhs('x = {a: \'moo\'}'))).toEqual(new Map([['a', moo]]));
|
||||
});
|
||||
|
||||
it('should error if there is a method', () => {
|
||||
expect(() => host.parseObjectLiteral(rhs('x = { foo() {} }')))
|
||||
.toThrowError('Unsupported syntax, expected a property assignment.');
|
||||
});
|
||||
|
||||
it('should error if there is a spread element', () => {
|
||||
expect(() => host.parseObjectLiteral(rhs('x = {...{a:\'moo\'}}')))
|
||||
.toThrowError('Unsupported syntax, expected a property assignment.');
|
||||
});
|
||||
});
|
||||
|
||||
describe('isFunctionExpression()', () => {
|
||||
it('should return true if the expression is a function', () => {
|
||||
expect(host.isFunctionExpression(rhs('x = function() {}'))).toBe(true);
|
||||
expect(host.isFunctionExpression(rhs('x = function foo() {}'))).toBe(true);
|
||||
expect(host.isFunctionExpression(rhs('x = () => {}'))).toBe(true);
|
||||
expect(host.isFunctionExpression(rhs('x = () => true'))).toBe(true);
|
||||
});
|
||||
|
||||
it('should return false if the expression is a function declaration', () => {
|
||||
expect(host.isFunctionExpression(expr('function foo() {}'))).toBe(false);
|
||||
});
|
||||
|
||||
it('should return false if the expression is not a function expression', () => {
|
||||
expect(host.isFunctionExpression(expr('[]'))).toBe(false);
|
||||
expect(host.isFunctionExpression(expr('"moo"'))).toBe(false);
|
||||
expect(host.isFunctionExpression(expr('\'moo\''))).toBe(false);
|
||||
expect(host.isFunctionExpression(expr('someIdentifier'))).toBe(false);
|
||||
expect(host.isFunctionExpression(expr('42'))).toBe(false);
|
||||
expect(host.isFunctionExpression(expr('{}'))).toBe(false);
|
||||
expect(host.isFunctionExpression(expr('null'))).toBe(false);
|
||||
expect(host.isFunctionExpression(expr('\'a\' + \'b\''))).toBe(false);
|
||||
expect(host.isFunctionExpression(expr('\`moo\`'))).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe('parseReturnValue()', () => {
|
||||
it('should extract the return value of a function', () => {
|
||||
const moo = expr('\'moo\'');
|
||||
expect(host.parseReturnValue(rhs('x = function() { return \'moo\'; }'))).toEqual(moo);
|
||||
});
|
||||
|
||||
it('should extract the value of a simple arrow function', () => {
|
||||
const moo = expr('\'moo\'');
|
||||
expect(host.parseReturnValue(rhs('x = () => \'moo\''))).toEqual(moo);
|
||||
});
|
||||
|
||||
it('should extract the return value of an arrow function', () => {
|
||||
const moo = expr('\'moo\'');
|
||||
expect(host.parseReturnValue(rhs('x = () => { return \'moo\' }'))).toEqual(moo);
|
||||
});
|
||||
|
||||
it('should error if the body has 0 statements', () => {
|
||||
expect(() => host.parseReturnValue(rhs('x = function () { }')))
|
||||
.toThrowError(
|
||||
'Unsupported syntax, expected a function body with a single return statement.');
|
||||
expect(() => host.parseReturnValue(rhs('x = () => { }')))
|
||||
.toThrowError(
|
||||
'Unsupported syntax, expected a function body with a single return statement.');
|
||||
});
|
||||
|
||||
it('should error if the body has more than 1 statement', () => {
|
||||
expect(() => host.parseReturnValue(rhs('x = function () { const x = 10; return x; }')))
|
||||
.toThrowError(
|
||||
'Unsupported syntax, expected a function body with a single return statement.');
|
||||
expect(() => host.parseReturnValue(rhs('x = () => { const x = 10; return x; }')))
|
||||
.toThrowError(
|
||||
'Unsupported syntax, expected a function body with a single return statement.');
|
||||
});
|
||||
|
||||
it('should error if the single statement is not a return statement', () => {
|
||||
expect(() => host.parseReturnValue(rhs('x = function () { const x = 10; }')))
|
||||
.toThrowError(
|
||||
'Unsupported syntax, expected a function body with a single return statement.');
|
||||
expect(() => host.parseReturnValue(rhs('x = () => { const x = 10; }')))
|
||||
.toThrowError(
|
||||
'Unsupported syntax, expected a function body with a single return statement.');
|
||||
});
|
||||
});
|
||||
|
||||
describe('getRange()', () => {
|
||||
it('should extract the range from the expression', () => {
|
||||
const file = parse('// preamble\nx = \'moo\';');
|
||||
const stmt = file.program.body[0];
|
||||
assertExpressionStatement(stmt);
|
||||
assertAssignmentExpression(stmt.expression);
|
||||
expect(host.getRange(stmt.expression.right))
|
||||
.toEqual({startLine: 1, startCol: 4, startPos: 16, endPos: 21});
|
||||
});
|
||||
|
||||
it('should error if there is no range information', () => {
|
||||
const moo = rhs('// preamble\nx = \'moo\';');
|
||||
expect(() => host.getRange(moo))
|
||||
.toThrowError('Unable to read range for node - it is missing location information.');
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
function expr(code: string): t.Expression {
|
||||
const stmt = template.ast(code);
|
||||
return (stmt as t.ExpressionStatement).expression;
|
||||
}
|
||||
|
||||
function rhs(code: string): t.Expression {
|
||||
const e = expr(code);
|
||||
assertAssignmentExpression(e);
|
||||
return e.right;
|
||||
}
|
||||
|
||||
function assertExpressionStatement(e: t.Node): asserts e is t.ExpressionStatement {
|
||||
if (!t.isExpressionStatement(e)) {
|
||||
throw new Error('Bad test - expected an expression statement');
|
||||
}
|
||||
}
|
||||
|
||||
function assertAssignmentExpression(e: t.Expression): asserts e is t.AssignmentExpression {
|
||||
if (!t.isAssignmentExpression(e)) {
|
||||
throw new Error('Bad test - expected an assignment expression');
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user