1  var Stack = require('./_Stack'),
 2      baseIsEqual = require('./_baseIsEqual');
 3  
 4  /** Used to compose bitmasks for value comparisons. */
 5  var COMPARE_PARTIAL_FLAG = 1,
 6      COMPARE_UNORDERED_FLAG = 2;
 7  
 8  /**
 9   * The base implementation of `_.isMatch` without support for iteratee shorthands.
10   *
11   * @private
12   * @param {Object} object The object to inspect.
13   * @param {Object} source The object of property values to match.
14   * @param {Array} matchData The property names, values, and compare flags to match.
15   * @param {Function} [customizer] The function to customize comparisons.
16   * @returns {boolean} Returns `true` if `object` is a match, else `false`.
17   */
18  function baseIsMatch(object, source, matchData, customizer) {
19    var index = matchData.length,
20        length = index,
21        noCustomizer = !customizer;
22  
23    if (object == null) {
24      return !length;
25    }
26    object = Object(object);
27    while (index--) {
28      var data = matchData[index];
29      if ((noCustomizer && data[2])
30            ? data[1] !== object[data[0]]
31            : !(data[0] in object)
32          ) {
33        return false;
34      }
35    }
36    while (++index < length) {
37      data = matchData[index];
38      var key = data[0],
39          objValue = object[key],
40          srcValue = data[1];
41  
42      if (noCustomizer && data[2]) {
43        if (objValue === undefined && !(key in object)) {
44          return false;
45        }
46      } else {
47        var stack = new Stack;
48        if (customizer) {
49          var result = customizer(objValue, srcValue, key, object, source, stack);
50        }
51        if (!(result === undefined
52              ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
53              : result
54            )) {
55          return false;
56        }
57      }
58    }
59    return true;
60  }
61  
62  module.exports = baseIsMatch;