e2be5ce542
Make the end position of a regexp literal the first character following the regexp. This matches the behaviour of number literals and string literals, as well as single-character tokens. This change corrects the lazy-parsing of arrow functions with concise bodies, whose last token is a regular expression literal. BUG=v8:4474 LOG=N R=wingo@igalia.com, adamk@chromium.org, rossberg@chromium.org Review URL: https://codereview.chromium.org/1389313003 Cr-Commit-Position: refs/heads/master@{#31189}
84 lines
2.9 KiB
JavaScript
84 lines
2.9 KiB
JavaScript
// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Arrow functions are like functions, except they throw when using the
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// "new" operator on them.
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assertEquals("function", typeof (() => {}));
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assertEquals(Function.prototype, Object.getPrototypeOf(() => {}));
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assertThrows(function() { new (() => {}); }, TypeError);
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assertFalse("prototype" in (() => {}));
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// Check the different syntax variations
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assertEquals(1, (() => 1)());
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assertEquals(2, (a => a + 1)(1));
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assertEquals(3, (() => { return 3; })());
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assertEquals(4, (a => { return a + 3; })(1));
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assertEquals(5, ((a, b) => a + b)(1, 4));
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assertEquals(6, ((a, b) => { return a + b; })(1, 5));
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// The following are tests from:
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// http://wiki.ecmascript.org/doku.php?id=harmony:arrow_function_syntax
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// Empty arrow function returns undefined
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var empty = () => {};
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assertEquals(undefined, empty());
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// Single parameter case needs no parentheses around parameter list
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var identity = x => x;
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assertEquals(empty, identity(empty));
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// No need for parentheses even for lower-precedence expression body
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var square = x => x * x;
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assertEquals(9, square(3));
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// Parenthesize the body to return an object literal expression
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var key_maker = val => ({key: val});
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assertEquals(empty, key_maker(empty).key);
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// Statement body needs braces, must use 'return' explicitly if not void
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var evens = [0, 2, 4, 6, 8];
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assertEquals([1, 3, 5, 7, 9], evens.map(v => v + 1));
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var fives = [];
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[1, 2, 3, 4, 5, 6, 7, 8, 9, 10].forEach(v => {
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if (v % 5 === 0) fives.push(v);
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});
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assertEquals([5, 10], fives);
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(function testRestrictedFunctionPropertiesStrict() {
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var arrowFn = () => { "use strict"; };
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assertFalse(arrowFn.hasOwnProperty("arguments"));
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assertThrows(function() { return arrowFn.arguments; }, TypeError);
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assertThrows(function() { arrowFn.arguments = {}; }, TypeError);
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assertFalse(arrowFn.hasOwnProperty("caller"));
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assertThrows(function() { return arrowFn.caller; }, TypeError);
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assertThrows(function() { arrowFn.caller = {}; }, TypeError);
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})();
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(function testRestrictedFunctionPropertiesSloppy() {
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var arrowFn = () => {};
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assertFalse(arrowFn.hasOwnProperty("arguments"));
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assertThrows(function() { return arrowFn.arguments; }, TypeError);
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assertThrows(function() { arrowFn.arguments = {}; }, TypeError);
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assertFalse(arrowFn.hasOwnProperty("caller"));
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assertThrows(function() { return arrowFn.caller; }, TypeError);
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assertThrows(function() { arrowFn.caller = {}; }, TypeError);
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})();
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// v8:4474
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(function testConciseBodyReturnsRegexp() {
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var arrow1 = () => /foo/
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var arrow2 = () => /foo/;
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var arrow3 = () => /foo/i
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var arrow4 = () => /foo/i;
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assertEquals(arrow1.toString(), "() => /foo/");
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assertEquals(arrow2.toString(), "() => /foo/");
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assertEquals(arrow3.toString(), "() => /foo/i");
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assertEquals(arrow4.toString(), "() => /foo/i");
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});
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