91 lines
3.1 KiB
JavaScript
91 lines
3.1 KiB
JavaScript
|
import composeArgs from './_composeArgs.js';
|
||
|
|
import composeArgsRight from './_composeArgsRight.js';
|
||
|
|
import replaceHolders from './_replaceHolders.js';
|
||
|
|
|
||
|
|
/** Used as the internal argument placeholder. */
|
||
|
|
var PLACEHOLDER = '__lodash_placeholder__';
|
||
|
|
|
||
|
|
/** Used to compose bitmasks for function metadata. */
|
||
|
|
var WRAP_BIND_FLAG = 1,
|
||
|
|
WRAP_BIND_KEY_FLAG = 2,
|
||
|
|
WRAP_CURRY_BOUND_FLAG = 4,
|
||
|
|
WRAP_CURRY_FLAG = 8,
|
||
|
|
WRAP_ARY_FLAG = 128,
|
||
|
|
WRAP_REARG_FLAG = 256;
|
||
|
|
|
||
|
|
/* Built-in method references for those with the same name as other `lodash` methods. */
|
||
|
|
var nativeMin = Math.min;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Merges the function metadata of `source` into `data`.
|
||
|
|
*
|
||
|
|
* Merging metadata reduces the number of wrappers used to invoke a function.
|
||
|
|
* This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
|
||
|
|
* may be applied regardless of execution order. Methods like `_.ary` and
|
||
|
|
* `_.rearg` modify function arguments, making the order in which they are
|
||
|
|
* executed important, preventing the merging of metadata. However, we make
|
||
|
|
* an exception for a safe combined case where curried functions have `_.ary`
|
||
|
|
* and or `_.rearg` applied.
|
||
|
|
*
|
||
|
|
* @private
|
||
|
|
* @param {Array} data The destination metadata.
|
||
|
|
* @param {Array} source The source metadata.
|
||
|
|
* @returns {Array} Returns `data`.
|
||
|
|
*/
|
||
|
|
function mergeData(data, source) {
|
||
|
|
var bitmask = data[1],
|
||
|
|
srcBitmask = source[1],
|
||
|
|
newBitmask = bitmask | srcBitmask,
|
||
|
|
isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
|
||
|
|
|
||
|
|
var isCombo =
|
||
|
|
((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
|
||
|
|
((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
|
||
|
|
((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
|
||
|
|
|
||
|
|
// Exit early if metadata can't be merged.
|
||
|
|
if (!(isCommon || isCombo)) {
|
||
|
|
return data;
|
||
|
|
}
|
||
|
|
// Use source `thisArg` if available.
|
||
|
|
if (srcBitmask & WRAP_BIND_FLAG) {
|
||
|
|
data[2] = source[2];
|
||
|
|
// Set when currying a bound function.
|
||
|
|
newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
|
||
|
|
}
|
||
|
|
// Compose partial arguments.
|
||
|
|
var value = source[3];
|
||
|
|
if (value) {
|
||
|
|
var partials = data[3];
|
||
|
|
data[3] = partials ? composeArgs(partials, value, source[4]) : value;
|
||
|
|
data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
|
||
|
|
}
|
||
|
|
// Compose partial right arguments.
|
||
|
|
value = source[5];
|
||
|
|
if (value) {
|
||
|
|
partials = data[5];
|
||
|
|
data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
|
||
|
|
data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
|
||
|
|
}
|
||
|
|
// Use source `argPos` if available.
|
||
|
|
value = source[7];
|
||
|
|
if (value) {
|
||
|
|
data[7] = value;
|
||
|
|
}
|
||
|
|
// Use source `ary` if it's smaller.
|
||
|
|
if (srcBitmask & WRAP_ARY_FLAG) {
|
||
|
|
data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
|
||
|
|
}
|
||
|
|
// Use source `arity` if one is not provided.
|
||
|
|
if (data[9] == null) {
|
||
|
|
data[9] = source[9];
|
||
|
|
}
|
||
|
|
// Use source `func` and merge bitmasks.
|
||
|
|
data[0] = source[0];
|
||
|
|
data[1] = newBitmask;
|
||
|
|
|
||
|
|
return data;
|
||
|
|
}
|
||
|
|
|
||
|
|
export default mergeData;
|