block-for.js revision 592a9fc1d8ea420377a2e7efd0600e20b058be2b 
1// Copyright 2011 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// Flags: --harmony-scoping
29
30// TODO(ES6): properly activate extended mode
31"use strict";
32
33function props(x) {
34  var array = [];
35  for (let p in x) array.push(p);
36  return array.sort();
37}
38
39assertEquals(0, props({}).length);
40assertEquals(1, props({x:1}).length);
41assertEquals(2, props({x:1, y:2}).length);
42
43assertArrayEquals(["x"], props({x:1}));
44assertArrayEquals(["x", "y"], props({x:1, y:2}));
45assertArrayEquals(["x", "y", "zoom"], props({x:1, y:2, zoom:3}));
46
47assertEquals(0, props([]).length);
48assertEquals(1, props([1]).length);
49assertEquals(2, props([1,2]).length);
50
51assertArrayEquals(["0"], props([1]));
52assertArrayEquals(["0", "1"], props([1,2]));
53assertArrayEquals(["0", "1", "2"], props([1,2,3]));
54
55var o = {};
56var a = [];
57let i = "outer_i";
58let s = "outer_s";
59for (let i = 0x0020; i < 0x01ff; i+=2) {
60  let s = 'char:' + String.fromCharCode(i);
61  a.push(s);
62  o[s] = i;
63}
64assertArrayEquals(a, props(o));
65assertEquals(i, "outer_i");
66assertEquals(s, "outer_s");
67
68var a = [];
69assertEquals(0, props(a).length);
70a[Math.pow(2,30)-1] = 0;
71assertEquals(1, props(a).length);
72a[Math.pow(2,31)-1] = 0;
73assertEquals(2, props(a).length);
74a[1] = 0;
75assertEquals(3, props(a).length);
76
77var result = '';
78for (let p in {a : [0], b : 1}) { result += p; }
79assertEquals('ab', result);
80
81var result = '';
82for (let p in {a : {v:1}, b : 1}) { result += p; }
83assertEquals('ab', result);
84
85var result = '';
86for (let p in { get a() {}, b : 1}) { result += p; }
87assertEquals('ab', result);
88
89var result = '';
90for (let p in { get a() {}, set a(x) {}, b : 1}) { result += p; }
91assertEquals('ab', result);
92
93
94// Check that there is exactly one variable without initializer
95// in a for-in statement with let variables.
96// TODO(ES6): properly activate extended mode
97assertThrows("function foo() { 'use strict'; for (let in {}) { } }", SyntaxError);
98assertThrows("function foo() { 'use strict'; for (let x = 3 in {}) { } }", SyntaxError);
99assertThrows("function foo() { 'use strict'; for (let x, y in {}) { } }", SyntaxError);
100assertThrows("function foo() { 'use strict'; for (let x = 3, y in {}) { } }", SyntaxError);
101assertThrows("function foo() { 'use strict'; for (let x, y = 4 in {}) { } }", SyntaxError);
102assertThrows("function foo() { 'use strict'; for (let x = 3, y = 4 in {}) { } }", SyntaxError);
103
104
105// In a normal for statement the iteration variable is not
106// freshly allocated for each iteration.
107function closures1() {
108  let a = [];
109  for (let i = 0; i < 5; ++i) {
110    a.push(function () { return i; });
111  }
112  for (let j = 0; j < 5; ++j) {
113    assertEquals(5, a[j]());
114  }
115}
116closures1();
117
118
119function closures2() {
120  let a = [], b = [];
121  for (let i = 0, j = 10; i < 5; ++i, ++j) {
122    a.push(function () { return i; });
123    b.push(function () { return j; });
124  }
125  for (let k = 0; k < 5; ++k) {
126    assertEquals(5, a[k]());
127    assertEquals(15, b[k]());
128  }
129}
130closures2();
131
132
133// In a for-in statement the iteration variable is fresh
134// for earch iteration.
135function closures3(x) {
136  let a = [];
137  for (let p in x) {
138    a.push(function () { return p; });
139  }
140  let k = 0;
141  for (let q in x) {
142    assertEquals(q, a[k]());
143    ++k;
144  }
145}
146closures3({a : [0], b : 1, c : {v : 1}, get d() {}, set e(x) {}});
147