1var baseSetData = require('./_baseSetData'),
2    createBind = require('./_createBind'),
3    createCurry = require('./_createCurry'),
4    createHybrid = require('./_createHybrid'),
5    createPartial = require('./_createPartial'),
6    getData = require('./_getData'),
7    mergeData = require('./_mergeData'),
8    setData = require('./_setData'),
9    setWrapToString = require('./_setWrapToString'),
10    toInteger = require('./toInteger');
11
12/** Error message constants. */
13var FUNC_ERROR_TEXT = 'Expected a function';
14
15/** Used to compose bitmasks for function metadata. */
16var WRAP_BIND_FLAG = 1,
17    WRAP_BIND_KEY_FLAG = 2,
18    WRAP_CURRY_FLAG = 8,
19    WRAP_CURRY_RIGHT_FLAG = 16,
20    WRAP_PARTIAL_FLAG = 32,
21    WRAP_PARTIAL_RIGHT_FLAG = 64;
22
23/* Built-in method references for those with the same name as other `lodash` methods. */
24var nativeMax = Math.max;
25
26/**
27 * Creates a function that either curries or invokes `func` with optional
28 * `this` binding and partially applied arguments.
29 *
30 * @private
31 * @param {Function|string} func The function or method name to wrap.
32 * @param {number} bitmask The bitmask flags.
33 *    1 - `_.bind`
34 *    2 - `_.bindKey`
35 *    4 - `_.curry` or `_.curryRight` of a bound function
36 *    8 - `_.curry`
37 *   16 - `_.curryRight`
38 *   32 - `_.partial`
39 *   64 - `_.partialRight`
40 *  128 - `_.rearg`
41 *  256 - `_.ary`
42 *  512 - `_.flip`
43 * @param {*} [thisArg] The `this` binding of `func`.
44 * @param {Array} [partials] The arguments to be partially applied.
45 * @param {Array} [holders] The `partials` placeholder indexes.
46 * @param {Array} [argPos] The argument positions of the new function.
47 * @param {number} [ary] The arity cap of `func`.
48 * @param {number} [arity] The arity of `func`.
49 * @returns {Function} Returns the new wrapped function.
50 */
51function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
52  var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
53  if (!isBindKey && typeof func != 'function') {
54    throw new TypeError(FUNC_ERROR_TEXT);
55  }
56  var length = partials ? partials.length : 0;
57  if (!length) {
58    bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
59    partials = holders = undefined;
60  }
61  ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
62  arity = arity === undefined ? arity : toInteger(arity);
63  length -= holders ? holders.length : 0;
64
65  if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
66    var partialsRight = partials,
67        holdersRight = holders;
68
69    partials = holders = undefined;
70  }
71  var data = isBindKey ? undefined : getData(func);
72
73  var newData = [
74    func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
75    argPos, ary, arity
76  ];
77
78  if (data) {
79    mergeData(newData, data);
80  }
81  func = newData[0];
82  bitmask = newData[1];
83  thisArg = newData[2];
84  partials = newData[3];
85  holders = newData[4];
86  arity = newData[9] = newData[9] === undefined
87    ? (isBindKey ? 0 : func.length)
88    : nativeMax(newData[9] - length, 0);
89
90  if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
91    bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
92  }
93  if (!bitmask || bitmask == WRAP_BIND_FLAG) {
94    var result = createBind(func, bitmask, thisArg);
95  } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
96    result = createCurry(func, bitmask, arity);
97  } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
98    result = createPartial(func, bitmask, thisArg, partials);
99  } else {
100    result = createHybrid.apply(undefined, newData);
101  }
102  var setter = data ? baseSetData : setData;
103  return setWrapToString(setter(result, newData), func, bitmask);
104}
105
106module.exports = createWrap;
107