description(
"This test checks that variable declaration 'var arguments;' doesn't override function's local arguments object."
);
// this test needs to use shouldBe() a bit wrong, since passing the string that
// would evaluate the actual expression (like "typeof arguments" instead of
// "'" + typeof arguments + "'" would use the arguments property that would possibly
// be set by the eval function. We want to test the arguments object that is in
// the current scope
// this tests the overriding of arguments in the top-level funcition block
function argumentsLength() {
var arguments;
shouldBe("'" + typeof arguments + "'", "'object'");
return arguments.length;
}
// this tests the overriding of arguments in a block statement inside function block
function argumentsLengthInnerBlock() {
for (var i=0; i < 1; ++i) {
var arguments;
shouldBe("'" + typeof arguments + "'", "'object'");
}
return arguments.length;
}
function argumentsLengthInnerBlock2() {
var i = 0;
for (var arguments; i > 1; ++i) {
shouldBe("'" + typeof arguments + "'", "'object'");
}
return arguments.length;
}
// this tests that arguments doesn't get overriden by a variable declaration
// with an initializer in a catch block with a parameter of the same name
function argumentsLengthTryCatch() {
try {
throw ["foo"];
} catch (arguments) {
var arguments = ["foo", "bar"];
}
return arguments.length;
}
// this tests that arguments doesn't get overriden by a variable declaration
// with an initializer in a with block where the parameter has a property of
// same name
function argumentsLengthWith() {
var object = { 'arguments': ["foo"] };
with (object) {
var arguments = ["foo", "bar"];
}
return arguments.length;
}
// this tests that arguments can still be overridden
function argumentsLengthOverride() {
shouldBe("'" + typeof arguments + "'", "'object'");
var argslen = arguments.length;
var arguments = [0,1,2,3,5,6,7];
shouldBe("'" + typeof arguments + "'", "'object'");
shouldBe("" + arguments.length, "7");
return argslen;
}
function argumentsLengthOverrideInnerBlock() {
shouldBe("'" + typeof arguments + "'", "'object'");
var argslen = arguments.length;
var i = 0;
for (var arguments = [0,1,2,3,5,6,7]; i < 1; ++i) {
// empty
}
shouldBe("" + arguments.length, "7");
return argslen;
}
function argumentsLengthOverrideInnerBlock2() {
shouldBe("'" + typeof arguments + "'", "'object'");
var argslen = arguments.length;
for (var i = 0; i < 1; ++i) {
var arguments = [0,1,2,3,5,6,7];
// empty
}
shouldBe("" + arguments.length, "7");
return argslen;
}
function argumentsLengthOverrideInnerBlock3() {
shouldBe("'" + typeof arguments + "'", "'object'");
var argslen = arguments.length;
var arguments;
for (var i = 0; i < 1; ++i) {
arguments = [0,1,2,3,5,6,7];
// empty
}
shouldBe("" + arguments.length, "7");
return argslen;
}
function argumentsTearOff1()
{
return argumentsTearOff2(2);
}
function argumentsTearOff2(b)
{
var v = b;
var w = argumentsTearOff1.arguments;
argumentsTearOff3(3);
return v;
}
function argumentsTearOff3(c)
{
var v = c;
}
shouldBe("argumentsLength()", "0");
shouldBe("argumentsLength(1)", "1");
shouldBe("argumentsLength('a','b')", "2");
shouldBe("argumentsLengthInnerBlock()", "0");
shouldBe("argumentsLengthInnerBlock(1)", "1");
shouldBe("argumentsLengthInnerBlock('a','b')", "2");
shouldBe("argumentsLengthInnerBlock2()", "0");
shouldBe("argumentsLengthInnerBlock2(1)", "1");
shouldBe("argumentsLengthInnerBlock2('a','b')", "2");
shouldBe("argumentsLengthTryCatch()", "0");
shouldBe("argumentsLengthWith()", "0");
shouldBe("argumentsLengthOverride()", "0");
shouldBe("argumentsLengthOverride(1)", "1");
shouldBe("argumentsLengthOverride('a','b')", "2");
shouldBe("argumentsLengthOverrideInnerBlock()", "0");
shouldBe("argumentsLengthOverrideInnerBlock(1)", "1");
shouldBe("argumentsLengthOverrideInnerBlock('a','b')", "2");
shouldBe("argumentsLengthOverrideInnerBlock2()", "0");
shouldBe("argumentsLengthOverrideInnerBlock2(1)", "1");
shouldBe("argumentsLengthOverrideInnerBlock2('a','b')", "2");
shouldBe("argumentsLengthOverrideInnerBlock3()", "0");
shouldBe("argumentsLengthOverrideInnerBlock3(1)", "1");
shouldBe("argumentsLengthOverrideInnerBlock3('a','b')", "2");
shouldBe("argumentsTearOff1()", "2");
// this tests that behaviour should persists for
// the program source elements also
shouldBe("typeof undefined", "'undefined'");
shouldBe("'" + typeof arguments + "'", "'undefined'");
var arguments;
shouldBe("typeof arguments", "'object'");
shouldBe("'" + typeof arguments + "'", "'undefined'");
var arguments = [3,2];
shouldBe("'" + typeof arguments + "'", "'object'");
shouldBe("" + arguments.length, "2");