// Copyright 2014 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.

// Mimics assert module in node.

function compose(message1, message2) {
  return message2 ? message1 + ': ' + message2 : message1
}

function fail(actual, expected, message, operator) {
  var e = Error(compose('FAIL', message) +
    ': (' + actual + ' ' + operator + ' ' + expected + ') should hold');
  fails.push(e);
  throw e;
}

function ok(value, message) {
  if (!value) {
    throw Error(compose('FAIL', + message) + ': value = ' + value);
  }
}

function equal(actual, expected, message) {
  if (!(expected == actual)) {
    fail(actual, expected, message, '==');
  }
}

function notEqual(actual, expected, message) {
  if (!(expected != actual)) {
    fail(actual, expected, message, '!=');
  }
}

function strictEqual(actual, expected, message) {
  if (!(expected === actual)) {
    fail(actual, expected, message, '===');
  }
}

function notStrictEqual(actual, expected, message) {
  if (!(expected !== actual)) {
    fail(actual, expected, message, '!==');
  }
}

function assert(value, message) {
  return ok(value, message);
}

function notImplemented() {
  throw Error('FAIL: This assertion function is not yet implemented.');
}

function clear() {
  this.fails = [];
}

assert.fail = fail;
assert.ok = ok;
assert.equal = equal;
assert.notEqual = notEqual;
assert.deepEqual = notImplemented;
assert.notDeepEqual = notImplemented;
assert.strictEqual = strictEqual;
assert.notStrictEqual = notStrictEqual;
assert.throws = notImplemented;
assert.doesNotThrow = notImplemented;
assert.ifError = notImplemented;

assert.clear = clear;

exports = assert;