1
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var apply = require('./_apply'),
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2
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createCtor = require('./_createCtor'),
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3
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root = require('./_root');
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4
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|
5
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/** Used to compose bitmasks for function metadata. */
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6
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var WRAP_BIND_FLAG = 1;
|
7
|
|
8
|
/**
|
9
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* Creates a function that wraps `func` to invoke it with the `this` binding
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10
|
* of `thisArg` and `partials` prepended to the arguments it receives.
|
11
|
*
|
12
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* @private
|
13
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* @param {Function} func The function to wrap.
|
14
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* @param {number} bitmask The bitmask flags. See `createWrap` for more details.
|
15
|
* @param {*} thisArg The `this` binding of `func`.
|
16
|
* @param {Array} partials The arguments to prepend to those provided to
|
17
|
* the new function.
|
18
|
* @returns {Function} Returns the new wrapped function.
|
19
|
*/
|
20
|
function createPartial(func, bitmask, thisArg, partials) {
|
21
|
var isBind = bitmask & WRAP_BIND_FLAG,
|
22
|
Ctor = createCtor(func);
|
23
|
|
24
|
function wrapper() {
|
25
|
var argsIndex = -1,
|
26
|
argsLength = arguments.length,
|
27
|
leftIndex = -1,
|
28
|
leftLength = partials.length,
|
29
|
args = Array(leftLength + argsLength),
|
30
|
fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
|
31
|
|
32
|
while (++leftIndex < leftLength) {
|
33
|
args[leftIndex] = partials[leftIndex];
|
34
|
}
|
35
|
while (argsLength--) {
|
36
|
args[leftIndex++] = arguments[++argsIndex];
|
37
|
}
|
38
|
return apply(fn, isBind ? thisArg : this, args);
|
39
|
}
|
40
|
return wrapper;
|
41
|
}
|
42
|
|
43
|
module.exports = createPartial;
|