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Move merge logic to mergeData.

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John-David Dalton
2014-12-06 14:23:49 -08:00
parent 5dc04266ea
commit 4b676df37f
1 changed files with 30 additions and 31 deletions
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61
lodash.js
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@@ -3150,34 +3150,7 @@
newData = [func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, arity, ary]; newData = [func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, arity, ary];
if (data && data !== true) { if (data && data !== true) {
var srcBitmask = data[1], newData = mergeData(newData, data);
newBitmask = bitmask | srcBitmask;
var arityFlags = ARY_FLAG | REARG_FLAG,
bindFlags = BIND_FLAG | BIND_KEY_FLAG,
comboFlags = arityFlags | bindFlags | CURRY_BOUND_FLAG | CURRY_RIGHT_FLAG;
var isAry = bitmask & ARY_FLAG && !(srcBitmask & ARY_FLAG),
isRearg = bitmask & REARG_FLAG && !(srcBitmask & REARG_FLAG),
argPosValue = isRearg ? argPos : data[6],
aryValue = isAry ? ary : data[9];
var isCommon = !(bitmask >= ARY_FLAG && srcBitmask > bindFlags) &&
!(bitmask > bindFlags && srcBitmask >= ARY_FLAG);
var isCombo = (newBitmask >= arityFlags && newBitmask <= comboFlags) &&
(bitmask < ARY_FLAG || ((isRearg || isAry) && argPosValue.length <= aryValue));
// Metadata is used to reduce the number of wrapper functions around `func`.
// This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
// may be applied regardless of order. Methods like `_.ary` and `_.rearg`
// augment arguments, making the order in which they are applied important,
// preventing their use with metadata. However, we make an exception for
// a safe common case where curried functions have `_.ary` and or `_.rearg`
// applied.
if (isCommon || isCombo) {
newData = mergeData(newData, data);
}
} }
newData[8] = newData[8] == null newData[8] = newData[8] == null
? (isBindKey ? 0 : newData[0].length) ? (isBindKey ? 0 : newData[0].length)
@@ -3419,6 +3392,13 @@
/** /**
* Merges the function metadata of `source` into `data`. * Merges the function metadata of `source` into `data`.
* *
* Merging metadata reduces the number of wrappers required 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`
* augment function arguments, making the order in which they are executed important,
* preventing the merging of metadata. However, we make an exception for a safe
* common case where curried functions have `_.ary` and or `_.rearg` applied.
*
* @private * @private
* @param {Array} data The destination metadata. * @param {Array} data The destination metadata.
* @param {Array} source The source metadata. * @param {Array} source The source metadata.
@@ -3426,13 +3406,32 @@
*/ */
function mergeData(data, source) { function mergeData(data, source) {
var bitmask = data[1], var bitmask = data[1],
srcBitmask = source[1]; srcBitmask = source[1],
newBitmask = bitmask | srcBitmask;
var arityFlags = ARY_FLAG | REARG_FLAG,
bindFlags = BIND_FLAG | BIND_KEY_FLAG,
comboFlags = arityFlags | bindFlags | CURRY_BOUND_FLAG | CURRY_RIGHT_FLAG;
var isAry = bitmask & ARY_FLAG && !(srcBitmask & ARY_FLAG),
isRearg = bitmask & REARG_FLAG && !(srcBitmask & REARG_FLAG),
argPos = (isRearg ? data : source)[7],
ary = (isAry ? data : source)[9];
var isCommon = !(bitmask >= ARY_FLAG && srcBitmask > bindFlags) &&
!(bitmask > bindFlags && srcBitmask >= ARY_FLAG);
var isCombo = (newBitmask >= arityFlags && newBitmask <= comboFlags) &&
(bitmask < ARY_FLAG || ((isRearg || isAry) && argPos[0].length <= ary));
if (!(isCommon || isCombo)) {
return data;
}
// Use source `thisArg` if available. // Use source `thisArg` if available.
if (srcBitmask & BIND_FLAG) { if (srcBitmask & BIND_FLAG) {
data[2] = source[2]; data[2] = source[2];
// Set when currying a bound function. // Set when currying a bound function.
bitmask |= (bitmask & BIND_FLAG) ? 0 : CURRY_BOUND_FLAG; newBitmask |= (bitmask & BIND_FLAG) ? 0 : CURRY_BOUND_FLAG;
} }
// Compose partial arguments. // Compose partial arguments.
var value = source[3]; var value = source[3];
@@ -3465,7 +3464,7 @@
} }
// Use source `func` and merge bitmasks. // Use source `func` and merge bitmasks.
data[0] = source[0]; data[0] = source[0];
data[1] = bitmask | srcBitmask; data[1] = newBitmask;
return data; return data;
} }