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Reduce iterator template and _.bindAll.

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Former-commit-id: 2655b7ca336baf9e04c87ff546c4bfc614873b50
This commit is contained in:
John-David Dalton
2012-10-20 00:08:18 -07:00
parent ada6115073
commit 7dfe69f6a5
5 changed files with 115 additions and 154 deletions
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114
lodash.js
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@@ -310,16 +310,16 @@
// the `iteratee` may be reassigned by the `top` snippet
'var index, value, iteratee = <%= firstArg %>, ' +
// assign the `result` variable an initial value
'result = <%= init || firstArg %>;\n' +
'result = <%= firstArg %>;\n' +
// exit early if the first argument is falsey
'if (!<%= firstArg %>) return result;\n' +
// add code before the iteration branches
'<%= top %>;\n' +
// the following branch is for iterating arrays and array-like objects
'<% if (arrayBranch) { %>' +
'<% if (arrayLoop) { %>' +
'var length = iteratee.length; index = -1;' +
' <% if (objectBranch) { %>\nif (length === +length) {<% } %>' +
' <% if (objectLoop) { %>\nif (typeof length == \'number\') {<% } %>' +
// add support for accessing string characters by index if needed
' <% if (noCharByIndex) { %>\n' +
@@ -328,17 +328,16 @@
' }' +
' <% } %>\n' +
' <%= arrayBranch.beforeLoop %>;\n' +
' while (++index < length) {\n' +
' value = iteratee[index];\n' +
' <%= arrayBranch.inLoop %>\n' +
' <%= arrayLoop %>\n' +
' }' +
' <% if (objectBranch) { %>\n}<% } %>' +
' <% if (objectLoop) { %>\n}<% } %>' +
'<% } %>' +
// the following branch is for iterating an object's own/inherited properties
'<% if (objectBranch) { %>' +
' <% if (arrayBranch) { %>\nelse {' +
'<% if (objectLoop) { %>' +
' <% if (arrayLoop) { %>\nelse {' +
// add support for iterating over `arguments` objects if needed
' <% } else if (noArgsEnum) { %>\n' +
@@ -346,7 +345,7 @@
' if (length && isArguments(iteratee)) {\n' +
' while (++index < length) {\n' +
' value = iteratee[index += \'\'];\n' +
' <%= objectBranch.inLoop %>\n' +
' <%= objectLoop %>\n' +
' }\n' +
' } else {' +
' <% } %>' +
@@ -367,18 +366,16 @@
' var ownIndex = -1,\n' +
' ownProps = objectTypes[typeof iteratee] ? nativeKeys(iteratee) : [],\n' +
' length = ownProps.length;\n\n' +
' <%= objectBranch.beforeLoop %>;\n' +
' while (++ownIndex < length) {\n' +
' index = ownProps[ownIndex];\n' +
' <% if (!hasDontEnumBug) { %>if (!(skipProto && index == \'prototype\')) {\n <% } %>' +
' value = iteratee[index];\n' +
' <%= objectBranch.inLoop %>\n' +
' <%= objectLoop %>\n' +
' <% if (!hasDontEnumBug) { %>}\n<% } %>' +
' }' +
// else using a for-in loop
' <% } else { %>\n' +
' <%= objectBranch.beforeLoop %>;\n' +
' for (index in iteratee) {<%' +
' if (!hasDontEnumBug || useHas) { %>\n if (<%' +
' if (!hasDontEnumBug) { %>!(skipProto && index == \'prototype\')<% }' +
@@ -387,7 +384,7 @@
' %>) {' +
' <% } %>\n' +
' value = iteratee[index];\n' +
' <%= objectBranch.inLoop %>;' +
' <%= objectLoop %>;' +
' <% if (!hasDontEnumBug || useHas) { %>\n }<% } %>\n' +
' }' +
' <% } %>' +
@@ -405,11 +402,11 @@
' %>!(ctor && ctor.prototype === iteratee) && <%' +
' } %>hasOwnProperty.call(iteratee, index)) {\n' +
' value = iteratee[index];\n' +
' <%= objectBranch.inLoop %>\n' +
' <%= objectLoop %>\n' +
' }' +
' <% } %>' +
' <% } %>' +
' <% if (arrayBranch || noArgsEnum) { %>\n}<% } %>' +
' <% if (arrayLoop || noArgsEnum) { %>\n}<% } %>' +
'<% } %>\n' +
// add code to the bottom of the iteration function
@@ -424,7 +421,7 @@
var forEachIteratorOptions = {
'args': 'collection, callback, thisArg',
'top': 'callback = createCallback(callback, thisArg)',
'inLoop': 'if (callback(value, index, collection) === false) return result'
'loop': 'if (callback(value, index, collection) === false) return result'
};
/** Reusable iterator options for `defaults`, and `extend` */
@@ -435,15 +432,14 @@
'top':
'for (var argsIndex = 1, argsLength = arguments.length; argsIndex < argsLength; argsIndex++) {\n' +
' if (iteratee = arguments[argsIndex]) {',
'inLoop': 'result[index] = value',
'objectLoop': 'result[index] = value',
'bottom': ' }\n}'
};
/** Reusable iterator options for `forIn` and `forOwn` */
var forOwnIteratorOptions = {
'inLoop': {
'object': forEachIteratorOptions.inLoop
}
'loop': null,
'objectLoop': forEachIteratorOptions.loop
};
/*--------------------------------------------------------------------------*/
@@ -594,48 +590,35 @@
}
/**
* Creates compiled iteration functions. The iteration function will be created
* to iterate over only objects if the first argument of `options.args` is
* "object" or `options.inLoop.array` is falsey.
* Creates compiled iteration functions.
*
* @private
* @param {Object} [options1, options2, ...] The compile options objects.
*
* useHas - A boolean to specify using `hasOwnProperty` checks in the object loop.
*
* useStrict - A boolean to specify including the "use strict" directive.
*
* args - A string of comma separated arguments the iteration function will accept.
*
* init - A string to specify the initial value of the `result` variable.
*
* top - A string of code to execute before the iteration branches.
*
* beforeLoop - A string or object containing an "array" or "object" property
* of code to execute before the array or object loops.
*
* inLoop - A string or object containing an "array" or "object" property
* of code to execute in the array or object loops.
*
* bottom - A string of code to execute after the iteration branches but
* before the `result` is returned.
* arrayLoop - A string of code to execute in the array loop.
* objectLoop - A string of code to execute in the object loop.
* loop - A string of code to execute in the array or object loops.
* bottom - A string of code to execute after the iteration branches.
*
* @returns {Function} Returns the compiled function.
*/
function createIterator() {
var data = {
'arrayLoop': '',
'bottom': '',
'hasDontEnumBug': hasDontEnumBug,
'init': '',
'isKeysFast': isKeysFast,
'objectLoop': '',
'noArgsEnum': noArgsEnum,
'noCharByIndex': noCharByIndex,
'shadowed': shadowed,
'top': '',
'useHas': true,
'useStrict': isStrictFast,
'arrayBranch': { 'beforeLoop': '' },
'objectBranch': { 'beforeLoop': '' }
'useStrict': isStrictFast
};
var object,
@@ -645,13 +628,9 @@
while (object = arguments[++index]) {
for (var prop in object) {
var value = object[prop];
// keep this regexp explicit for the build pre-process
if (/beforeLoop|inLoop/.test(prop)) {
if (typeof value == 'string') {
value = { 'array': value, 'object': value };
}
data.arrayBranch[prop] = value.array;
data.objectBranch[prop] = value.object;
if (prop == 'loop') {
data.arrayLoop = value;
data.objectLoop = value;
} else {
data[prop] = value;
}
@@ -659,21 +638,17 @@
}
// set additional template `data` properties
var args = data.args;
if ((data.firstArg = /^[^,]+/.exec(args)[0]) != 'collection' || !data.arrayBranch.inLoop) {
data.arrayBranch = null;
}
if (!data.objectBranch.inLoop) {
data.objectBranch = null;
}
data.firstArg = /^[^,]+/.exec(args)[0];
// create the function factory
var factory = Function(
'bind, createCallback, forIn, hasOwnProperty, isArguments, isFunction, ' +
'bind, createCallback, functions, hasOwnProperty, isArguments, isFunction, ' +
'objectTypes, nativeKeys, propertyIsEnumerable, stringClass, toString',
'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}'
);
// return the compiled function
return factory(
bind, createCallback, forIn, hasOwnProperty, isArguments, isFunction,
bind, createCallback, functions, hasOwnProperty, isArguments, isFunction,
objectTypes, nativeKeys, propertyIsEnumerable, stringClass, toString
);
}
@@ -1082,7 +1057,7 @@
* // => { 'flavor': 'chocolate', 'sprinkles': 'rainbow' }
*/
var defaults = createIterator(extendIteratorOptions, {
'inLoop': 'if (result[index] == null) ' + extendIteratorOptions.inLoop
'objectLoop': 'if (result[index] == null) ' + extendIteratorOptions.objectLoop
});
/**
@@ -1250,7 +1225,7 @@
if ((className == arrayClass || className == stringClass ||
className == argsClass || (noArgsClass && isArguments(value))) ||
(className == objectClass && length === +length && isFunction(value.splice))) {
(className == objectClass && typeof length == 'number' && isFunction(value.splice))) {
return !length;
}
forOwn(value, function() {
@@ -1856,7 +1831,7 @@
*/
function contains(collection, target) {
var length = collection ? collection.length : 0;
if (length === +length) {
if (typeof length == 'number') {
return (toString.call(collection) == stringClass
? collection.indexOf(target)
: indexOf(collection, target)
@@ -2383,7 +2358,7 @@
*/
function size(collection) {
var length = collection ? collection.length : 0;
return length === +length ? length : keys(collection).length;
return typeof length == 'number' ? length : keys(collection).length;
}
/**
@@ -2476,8 +2451,7 @@
if (!collection) {
return [];
}
var length = collection.length;
if (length === +length) {
if (typeof collection.length == 'number') {
return (noArraySliceOnStrings ? toString.call(collection) == stringClass : typeof collection == 'string')
? collection.split('')
: slice.call(collection);
@@ -3212,17 +3186,13 @@
'args': 'object',
'top':
'var funcs = arguments,\n' +
' length = funcs.length;\n' +
'if (length > 1) {\n' +
' while (--length) {\n' +
' index = funcs[length];\n' +
' result[index] = bind(result[index], result)\n' +
' }\n' +
' return result\n' +
' index = funcs.length > 1 ? 0 : (funcs = functions(object), -1),\n' +
' length = funcs.length;' +
'while (++index < length) {\n' +
' value = funcs[index];\n' +
' result[value] = bind(result[value], result)\n' +
'}\n' +
'forIn(result, function(value, key) {\n' +
' if (isFunction(value)) result[key] = bind(value, result)\n' +
'})'
'return result'
});
/**