v8/test/mjsunit/harmony/block-scoping.js
keuchel@chromium.org c6c504f8b6 Parse harmony let declarations.
Implementation of the harmony block scoped let bindings as proposed here:
http://wiki.ecmascript.org/doku.php?id=harmony:block_scoped_bindings

Changes to the syntax are explained there. They are active under the
harmony_block_scoping_ flag in the parser.

Review URL: http://codereview.chromium.org/7616009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@8944 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-08-16 14:24:12 +00:00

217 lines
5.0 KiB
JavaScript

// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Flags: --allow-natives-syntax --harmony-block-scoping
// Test functionality of block scopes.
// Hoisting of var declarations.
function f1() {
{
var x = 1;
var y;
}
assertEquals(1, x)
assertEquals(undefined, y)
}
f1();
// Dynamic lookup in and through block contexts.
function f2(one) {
var x = one + 1;
let y = one + 2;
{
let z = one + 3;
assertEquals(1, eval('one'));
assertEquals(2, eval('x'));
assertEquals(3, eval('y'));
assertEquals(4, eval('z'));
}
}
f2(1);
// Lookup in and through block contexts.
function f3(one) {
var x = one + 1;
let y = one + 2;
{
let z = one + 3;
assertEquals(1, one);
assertEquals(2, x);
assertEquals(3, y);
assertEquals(4, z);
}
}
f3(1);
// Dynamic lookup from closure.
function f4(one) {
var x = one + 1;
let y = one + 2;
{
let z = one + 3;
function f() {
assertEquals(1, eval('one'));
assertEquals(2, eval('x'));
assertEquals(3, eval('y'));
assertEquals(4, eval('z'));
};
}
}
f4(1);
// Lookup from closure.
function f5(one) {
var x = one + 1;
let y = one + 2;
{
let z = one + 3;
function f() {
assertEquals(1, one);
assertEquals(2, x);
assertEquals(3, y);
assertEquals(4, z);
};
}
}
f5(1);
// Return from block.
function f6() {
let x = 1;
{
let y = 2;
return x + y;
}
}
assertEquals(3, f6(6));
// Variable shadowing and lookup.
function f7(a) {
let b = 1;
var c = 1;
var d = 1;
{ // let variables shadowing argument, let and var variables
let a = 2;
let b = 2;
let c = 2;
assertEquals(2,a);
assertEquals(2,b);
assertEquals(2,c);
}
try {
throw 'stuff1';
} catch (a) {
assertEquals('stuff1',a);
// catch variable shadowing argument
a = 2;
assertEquals(2,a);
{
// let variable shadowing catch variable
let a = 3;
assertEquals(3,a);
try {
throw 'stuff2';
} catch (a) {
assertEquals('stuff2',a);
// catch variable shadowing let variable
a = 4;
assertEquals(4,a);
}
assertEquals(3,a);
}
assertEquals(2,a);
}
try {
throw 'stuff3';
} catch (c) {
// catch variable shadowing var variable
assertEquals('stuff3',c);
try {
throw 'stuff4';
} catch(c) {
assertEquals('stuff4',c);
// catch variable shadowing catch variable
c = 3;
assertEquals(3,c);
}
(function(c) {
// argument shadowing catch variable
c = 3;
assertEquals(3,c);
})();
assertEquals('stuff3', c);
(function() {
// var variable shadowing catch variable
var c = 3;
})();
assertEquals('stuff3', c);
c = 2;
}
assertEquals(1,c);
(function(a,b,c) {
// arguments shadowing argument, let and var variable
a = 2;
b = 2;
c = 2;
assertEquals(2,a);
assertEquals(2,b);
assertEquals(2,c);
// var variable shadowing var variable
var d = 2;
})(1,1);
assertEquals(1,a);
assertEquals(1,b);
assertEquals(1,c);
assertEquals(1,d);
}
f7(1);
// Ensure let variables are block local and var variables function local.
function f8() {
var let_accessors = [];
var var_accessors = [];
for (var i = 0; i < 10; i++) {
let x = i;
var y = i;
let_accessors[i] = function() { return x; }
var_accessors[i] = function() { return y; }
}
for (var j = 0; j < 10; j++) {
y = j + 10;
assertEquals(j, let_accessors[j]());
assertEquals(y, var_accessors[j]());
}
}
f8();