// Copyright JS Foundation and other contributors, http://js.foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

function check_syntax_error (code)
{
  try {
    eval (code)
    assert (false)
  } catch (e) {
    assert (e instanceof SyntaxError)
  }
}

var idx = 0;
for (var [a,b] of [[1,2], [3,4]])
{
  if (idx == 0)
  {
    assert(a === 1);
    assert(b === 2);
    idx = 1;
  }
  else
  {
    assert(a === 3);
    assert(b === 4);
  }
}

assert(a === 3);
assert(b === 4);

idx = 0;
for (let [a,b] of [[5,6], [7,8]])
{
  if (idx == 0)
  {
    assert(a === 5);
    assert(b === 6);
    idx = 1;
  }
  else
  {
    assert(a === 7);
    assert(b === 8);
  }
}

assert(a === 3);
assert(b === 4);

idx = 0;
for (let [a,b] of [[11,12], [13,14]])
{
  if (idx == 0)
  {
    eval("assert(a === 11)");
    eval("assert(b === 12)");
    idx = 1;
  }
  else
  {
    eval("assert(a === 13)");
    eval("assert(b === 14)");
  }
}

assert(a === 3);
assert(b === 4);

check_syntax_error("for (let [a,b] = [1,2] of [[3,4]]) {}")

idx = 0;
for ([a,b] of [[10,true], ["x",null]])
{
  if (idx == 0)
  {
    assert(a === 10);
    assert(b === true);
    idx = 1;
  }
  else
  {
    assert(a === "x");
    assert(b === null);
  }
}

assert(a === "x");
assert(b === null);

check_syntax_error("for ([a,b] = [1,2] of [[3,4]]) {}")

var o = {}
for ([a, b] = [o,false]; false; )
{
  assert(false);
}

assert(a === o);
assert(b === false);

for ([a, b] + [a, b]; false; )
{
  assert(false);
}

check_syntax_error("for ([a,b] + 1 of [[3,4]]) {}")