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Use vars to store bitmask flags to improve readability.

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This commit is contained in:
John-David Dalton
2014-01-15 23:46:05 -08:00
parent c6557e5078
commit 999dfb84ee
8 changed files with 448 additions and 412 deletions
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75
lodash.js
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@@ -18,11 +18,19 @@
/** Used to generate unique IDs */
var idCounter = 0;
/** Used to compose bitmasks for `__bindData__` */
var BIND_FLAG = 1,
BIND_KEY_FLAG = 2,
CURRY_FLAG = 4,
CURRY_BOUND_FLAG = 8,
PARTIAL_FLAG = 16,
PARTIAL_RIGHT_FLAG = 32;
/** Used as the size when optimizations are enabled for large arrays */
var largeArraySize = 75;
var LARGE_ARRAY_SIZE = 75;
/** Used as the max size of the `arrayPool` and `objectPool` */
var maxPoolSize = 40;
var MAX_POOL_SIZE = 40;
/** Used to detect and test whitespace */
var whitespace = (
@@ -489,7 +497,7 @@
*/
function releaseArray(array) {
array.length = 0;
if (arrayPool.length < maxPoolSize) {
if (arrayPool.length < MAX_POOL_SIZE) {
arrayPool.push(array);
}
}
@@ -506,7 +514,7 @@
releaseObject(cache);
}
object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;
if (objectPool.length < maxPoolSize) {
if (objectPool.length < MAX_POOL_SIZE) {
objectPool.push(object);
}
}
@@ -1365,10 +1373,10 @@
thisArg = bindData[4],
arity = bindData[5];
var isBind = bitmask & 1,
isBindKey = bitmask & 2,
isCurry = bitmask & 4,
isCurryBound = bitmask & 8,
var isBind = bitmask & BIND_FLAG,
isBindKey = bitmask & BIND_KEY_FLAG,
isCurry = bitmask & CURRY_FLAG,
isCurryBound = bitmask & CURRY_BOUND_FLAG,
key = func;
function bound() {
@@ -1383,8 +1391,9 @@
push.apply(args, partialRightArgs);
}
if (isCurry && args.length < arity) {
bitmask |= 16 & ~32;
return baseCreateWrapper([func, (isCurryBound ? bitmask : bitmask & ~3), args, null, thisArg, arity]);
bitmask |= PARTIAL_FLAG;
bitmask &= ~PARTIAL_RIGHT_FLAG;
return baseCreateWrapper([func, (isCurryBound ? bitmask : bitmask & ~(BIND_FLAG | BIND_KEY_FLAG)), args, null, thisArg, arity]);
}
}
args || (args = arguments);
@@ -1415,7 +1424,7 @@
var index = -1,
indexOf = getIndexOf(),
length = array ? array.length : 0,
isLarge = length >= largeArraySize && indexOf === baseIndexOf,
isLarge = length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
result = [];
if (isLarge) {
@@ -1784,7 +1793,7 @@
length = array ? array.length : 0,
result = [];
var isLarge = !isSorted && length >= largeArraySize && indexOf === baseIndexOf,
var isLarge = !isSorted && length >= LARGE_ARRAY_SIZE && indexOf === baseIndexOf,
seen = (callback || isLarge) ? getArray() : result;
if (isLarge) {
@@ -1853,7 +1862,7 @@
*
* @private
* @param {Function|string} func The function or method name to reference.
* @param {number} bitmask The bitmask of method flags to compose.
* @param {number} bitmask The bitmask of flags to compose.
* The bitmask may be composed of the following flags:
* 1 - `_.bind`
* 2 - `_.bindKey`
@@ -1870,12 +1879,12 @@
* @returns {Function} Returns the new function.
*/
function createWrapper(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) {
var isBind = bitmask & 1,
isBindKey = bitmask & 2,
isCurry = bitmask & 4,
isCurryBound = bitmask & 8,
isPartial = bitmask & 16,
isPartialRight = bitmask & 32;
var isBind = bitmask & BIND_FLAG,
isBindKey = bitmask & BIND_KEY_FLAG,
isCurry = bitmask & CURRY_FLAG,
isCurryBound = bitmask & CURRY_BOUND_FLAG,
isPartial = bitmask & PARTIAL_FLAG,
isPartialRight = bitmask & PARTIAL_RIGHT_FLAG;
if (!isBindKey && !isFunction(func)) {
throw new TypeError;
@@ -1899,15 +1908,15 @@
bindData[3] = slice(bindData[3]);
}
// set `thisBinding` is not previously bound
if (isBind && !(bindData[1] & 1)) {
if (isBind && !(bindData[1] & BIND_FLAG)) {
bindData[4] = thisArg;
}
// set if previously bound but not currently (subsequent curried functions)
if (!isBind && bindData[1] & 1) {
if (!isBind && bindData[1] & BIND_FLAG) {
bitmask |= 8;
}
// set curried arity if not yet set
if (isCurry && !(bindData[1] & 4)) {
if (isCurry && !(bindData[1] & CURRY_FLAG)) {
bindData[5] = arity;
}
// append partial left arguments
@@ -1923,7 +1932,7 @@
return createWrapper.apply(null, bindData);
}
// fast path for `_.bind`
var creater = (bitmask == 1 || bitmask === 17) ? baseBind : baseCreateWrapper;
var creater = (bitmask == BIND_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) ? baseBind : baseCreateWrapper;
return creater([func, bitmask, partialArgs, partialRightArgs, thisArg, arity]);
}
@@ -2505,7 +2514,7 @@
var value = arguments[argsIndex];
if (isArray(value) || isArguments(value)) {
args.push(value);
caches.push(trustIndexOf && value.length >= largeArraySize &&
caches.push(trustIndexOf && value.length >= LARGE_ARRAY_SIZE &&
createCache(argsIndex ? args[argsIndex] : seen));
}
}
@@ -4571,8 +4580,8 @@
*/
function bind(func, thisArg) {
return arguments.length > 2
? createWrapper(func, 17, slice(arguments, 2), null, thisArg)
: createWrapper(func, 1, null, null, thisArg);
? createWrapper(func, BIND_FLAG | PARTIAL_FLAG, slice(arguments, 2), null, thisArg)
: createWrapper(func, BIND_FLAG, null, null, thisArg);
}
/**
@@ -4608,7 +4617,7 @@
while (++index < length) {
var key = funcs[index];
object[key] = createWrapper(object[key], 1, null, null, object);
object[key] = createWrapper(object[key], BIND_FLAG, null, null, object);
}
return object;
}
@@ -4650,8 +4659,8 @@
*/
function bindKey(object, key) {
return arguments.length > 2
? createWrapper(key, 19, slice(arguments, 2), null, object)
: createWrapper(key, 3, null, null, object);
? createWrapper(key, BIND_FLAG | BIND_KEY_FLAG | PARTIAL_FLAG, slice(arguments, 2), null, object)
: createWrapper(key, BIND_FLAG | BIND_KEY_FLAG, null, null, object);
}
/**
@@ -4736,7 +4745,7 @@
*/
function curry(func, arity) {
arity = typeof arity == 'number' ? arity : (+arity || func.length);
return createWrapper(func, 4, null, null, null, arity);
return createWrapper(func, CURRY_FLAG, null, null, null, arity);
}
/**
@@ -5038,7 +5047,7 @@
* // => 'hi fred'
*/
function partial(func) {
return createWrapper(func, 16, slice(arguments, 1));
return createWrapper(func, PARTIAL_FLAG, slice(arguments, 1));
}
/**
@@ -5072,7 +5081,7 @@
* // => { '_': _, 'jq': $ }
*/
function partialRight(func) {
return createWrapper(func, 32, null, slice(arguments, 1));
return createWrapper(func, PARTIAL_RIGHT_FLAG, null, slice(arguments, 1));
}
/**
@@ -5148,7 +5157,7 @@
* // => '<p>fred, barney, &amp; pebbles</p>'
*/
function wrap(value, wrapper) {
return createWrapper(wrapper, 16, [value]);
return createWrapper(wrapper, PARTIAL_FLAG, [value]);
}
/*--------------------------------------------------------------------------*/