JSTests/mozilla/js1_5/Exceptions/errstack-001.js

/* ***** BEGIN LICENSE BLOCK *****
* Version: NPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (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.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is JavaScript Engine testing utilities.
*
* The Initial Developer of the Original Code is Netscape Communications Corp.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s): brendan@mozilla.org, pschwartau@netscape.com
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* the provisions above, a recipient may use your version of this file under
* the terms of any one of the NPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK *****
*
*
* Date:    28 Feb 2002
* SUMMARY: Testing that Error.stack distinguishes between:
*
* A) top-level calls: myFunc();
* B) no-name function calls: function() { myFunc();} ()
*
* The stack frame for A) should begin with '@'
* The stack frame for B) should begin with '()'
*
* This behavior was coded by Brendan during his fix for bug 127136.
* See http://bugzilla.mozilla.org/show_bug.cgi?id=127136#c13
*
* Note: our function getStackFrames(err) orders the array of stack frames
* so that the 0th element will correspond to the highest frame, i.e. will
* correspond to a line in top-level code. The 1st element will correspond
* to the function that is called first, and so on...
*
* NOTE: At present Rhino does not have an Error.stack property. It is an
* ECMA extension, see http://bugzilla.mozilla.org/show_bug.cgi?id=123177
*/
//-----------------------------------------------------------------------------
var UBound = 0;
var bug = '(none)';
var summary = 'Testing Error.stack';
var status = '';
var statusitems = [];
var actual = '';
var actualvalues = [];
var expect= '';
var expectedvalues = [];
var myErr = '';
var stackFrames = '';


function A(x,y)
{
  return B(x+1,y+1);
}

function B(x,z)
{
  return C(x+1,z+1);
}

function C(x,y)
{
  return D(x+1,y+1);
}

function D(x,z)
{
  try
  {
    throw new Error('meep!');
  }
  catch (e)
  {
    return e;
  }
}


myErr = A(44,13);
stackFrames = getStackFrames(myErr);
  status = inSection(1);
  actual = stackFrames[0].substring(0,1);
  expect = '@';
  addThis();

  status = inSection(2);
  actual = stackFrames[1].substring(0,9);
  expect = 'A(44,13)@';
  addThis();

  status = inSection(3);
  actual = stackFrames[2].substring(0,9);
  expect = 'B(45,14)@';
  addThis();

  status = inSection(4);
  actual = stackFrames[3].substring(0,9);
  expect = 'C(46,15)@';
  addThis();

  status = inSection(5);
  actual = stackFrames[4].substring(0,9);
  expect = 'D(47,16)@';
  addThis();



myErr = A('44:foo','13:bar');
stackFrames = getStackFrames(myErr);
  status = inSection(6);
  actual = stackFrames[0].substring(0,1);
  expect = '@';
  addThis();

  status = inSection(7);
  actual = stackFrames[1].substring(0,21);
  expect = 'A("44:foo","13:bar")@';
  addThis();

  status = inSection(8);
  actual = stackFrames[2].substring(0,23);
  expect = 'B("44:foo1","13:bar1")@';
  addThis();

  status = inSection(9);
  actual = stackFrames[3].substring(0,25);
  expect = 'C("44:foo11","13:bar11")@';
  addThis();

  status = inSection(10);
  actual = stackFrames[4].substring(0,27);
  expect = 'D("44:foo111","13:bar111")@';;
  addThis();



/*
 * Make the first frame occur in a function with an empty name -
 */
myErr = function() { return A(44,13); } ();
stackFrames = getStackFrames(myErr);
  status = inSection(11);
  actual = stackFrames[0].substring(0,1);
  expect = '@';
  addThis();

  status = inSection(12);
  actual = stackFrames[1].substring(0,3);
  expect = '()@';
  addThis();

  status = inSection(13);
  actual = stackFrames[2].substring(0,9);
  expect = 'A(44,13)@';
  addThis();

// etc. for the rest of the frames as above



/*
 * Make the first frame occur in a function with name 'anonymous' -
 */
var f = Function('return A(44,13);');
myErr = f();
stackFrames = getStackFrames(myErr);
  status = inSection(14);
  actual = stackFrames[0].substring(0,1);
  expect = '@';
  addThis();

  status = inSection(15);
  actual = stackFrames[1].substring(0,12);
  expect = 'anonymous()@';
  addThis();

  status = inSection(16);
  actual = stackFrames[2].substring(0,9);
  expect = 'A(44,13)@';
  addThis();

// etc. for the rest of the frames as above



/*
 * Make a user-defined error via the Error() function -
 */
var message = 'Hi there!'; var fileName = 'file name'; var lineNumber = 0;
myErr = Error(message, fileName, lineNumber);
stackFrames = getStackFrames(myErr);
  status = inSection(17);
  actual = stackFrames[0].substring(0,1);
  expect = '@';
  addThis();


/*
 * Now use the |new| keyword. Re-use the same params -
 */
myErr = new Error(message, fileName, lineNumber);
stackFrames = getStackFrames(myErr);
  status = inSection(18);
  actual = stackFrames[0].substring(0,1);
  expect = '@';
  addThis();




//-----------------------------------------------------------------------------
test();
//-----------------------------------------------------------------------------



/*
 * Split the string |err.stack| along its '\n' delimiter.
 * As of 2002-02-28 |err.stack| ends with the delimiter, so
 * the resulting array has an empty string as its last element.
 *
 * Pop that useless element off before doing anything.
 * Then reverse the array, for convenience of indexing -
 */
function getStackFrames(err)
{
  var arr = err.stack.split('\n');
  arr.pop();
  return arr.reverse();
}


function addThis()
{
  statusitems[UBound] = status;
  actualvalues[UBound] = actual;
  expectedvalues[UBound] = expect;
  UBound++;
}


function test()
{
  enterFunc('test');
  printBugNumber(bug);
  printStatus(summary);

  for (var i=0; i<UBound; i++)
  {
    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
  }

  exitFunc ('test');
}