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Remove mergeData.

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John-David Dalton
2017-04-19 00:01:10 -07:00
parent 4092747dde
commit 65b148a3b2
1 changed files with 0 additions and 89 deletions
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89
.internal/mergeData.js
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@@ -1,89 +0,0 @@
import composeArgs from './composeArgs.js'
import composeArgsRight from './composeArgsRight.js'
import replaceHolders from './replaceHolders.js'
/** Used as the internal argument placeholder. */
const PLACEHOLDER = '__lodash_placeholder__'
/** Used to compose bitmasks for function metadata. */
const WRAP_BIND_FLAG = 1
const WRAP_BIND_KEY_FLAG = 2
const WRAP_CURRY_BOUND_FLAG = 4
const WRAP_CURRY_FLAG = 8
const WRAP_ARY_FLAG = 128
const WRAP_REARG_FLAG = 256
/**
* 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) {
const bitmask = data[1]
const srcBitmask = source[1]
let newBitmask = bitmask | srcBitmask
const isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG)
const 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.
let partials
let value = source[3]
if (value) {
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] : Math.min(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