570 lines
16 KiB
JavaScript
570 lines
16 KiB
JavaScript
var mapping = require('./_mapping'),
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fallbackHolder = require('./placeholder');
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/** Built-in value reference. */
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var push = Array.prototype.push;
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/**
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* Creates a function, with an arity of `n`, that invokes `func` with the
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* arguments it receives.
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*
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* @private
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* @param {Function} func The function to wrap.
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* @param {number} n The arity of the new function.
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* @returns {Function} Returns the new function.
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*/
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function baseArity(func, n) {
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return n == 2
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? function(a, b) { return func.apply(undefined, arguments); }
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: function(a) { return func.apply(undefined, arguments); };
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}
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/**
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* Creates a function that invokes `func`, with up to `n` arguments, ignoring
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* any additional arguments.
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*
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* @private
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* @param {Function} func The function to cap arguments for.
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* @param {number} n The arity cap.
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* @returns {Function} Returns the new function.
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*/
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function baseAry(func, n) {
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return n == 2
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? function(a, b) { return func(a, b); }
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: function(a) { return func(a); };
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}
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/**
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* Creates a clone of `array`.
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*
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* @private
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* @param {Array} array The array to clone.
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* @returns {Array} Returns the cloned array.
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*/
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function cloneArray(array) {
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var length = array ? array.length : 0,
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result = Array(length);
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while (length--) {
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result[length] = array[length];
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}
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return result;
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}
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/**
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* Creates a function that clones a given object using the assignment `func`.
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*
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* @private
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* @param {Function} func The assignment function.
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* @returns {Function} Returns the new cloner function.
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*/
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function createCloner(func) {
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return function(object) {
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return func({}, object);
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};
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}
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/**
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* A specialized version of `_.spread` which flattens the spread array into
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* the arguments of the invoked `func`.
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*
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* @private
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* @param {Function} func The function to spread arguments over.
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* @param {number} start The start position of the spread.
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* @returns {Function} Returns the new function.
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*/
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function flatSpread(func, start) {
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return function() {
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var length = arguments.length,
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lastIndex = length - 1,
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args = Array(length);
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while (length--) {
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args[length] = arguments[length];
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}
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var array = args[start],
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otherArgs = args.slice(0, start);
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if (array) {
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push.apply(otherArgs, array);
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}
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if (start != lastIndex) {
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push.apply(otherArgs, args.slice(start + 1));
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}
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return func.apply(this, otherArgs);
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};
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}
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/**
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* Creates a function that wraps `func` and uses `cloner` to clone the first
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* argument it receives.
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*
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* @private
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* @param {Function} func The function to wrap.
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* @param {Function} cloner The function to clone arguments.
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* @returns {Function} Returns the new immutable function.
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*/
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function wrapImmutable(func, cloner) {
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return function() {
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var length = arguments.length;
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if (!length) {
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return;
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}
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var args = Array(length);
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while (length--) {
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args[length] = arguments[length];
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}
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var result = args[0] = cloner.apply(undefined, args);
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func.apply(undefined, args);
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return result;
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};
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}
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/**
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* The base implementation of `convert` which accepts a `util` object of methods
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* required to perform conversions.
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*
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* @param {Object} util The util object.
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* @param {string} name The name of the function to convert.
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* @param {Function} func The function to convert.
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* @param {Object} [options] The options object.
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* @param {boolean} [options.cap=true] Specify capping iteratee arguments.
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* @param {boolean} [options.curry=true] Specify currying.
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* @param {boolean} [options.fixed=true] Specify fixed arity.
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* @param {boolean} [options.immutable=true] Specify immutable operations.
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* @param {boolean} [options.rearg=true] Specify rearranging arguments.
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* @returns {Function|Object} Returns the converted function or object.
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*/
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function baseConvert(util, name, func, options) {
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var isLib = typeof name == 'function',
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isObj = name === Object(name);
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if (isObj) {
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options = func;
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func = name;
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name = undefined;
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}
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if (func == null) {
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throw new TypeError;
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}
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options || (options = {});
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var config = {
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'cap': 'cap' in options ? options.cap : true,
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'curry': 'curry' in options ? options.curry : true,
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'fixed': 'fixed' in options ? options.fixed : true,
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'immutable': 'immutable' in options ? options.immutable : true,
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'rearg': 'rearg' in options ? options.rearg : true
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};
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var defaultHolder = isLib ? func : fallbackHolder,
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forceCurry = ('curry' in options) && options.curry,
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forceFixed = ('fixed' in options) && options.fixed,
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forceRearg = ('rearg' in options) && options.rearg,
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pristine = isLib ? func.runInContext() : undefined;
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var helpers = isLib ? func : {
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'ary': util.ary,
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'assign': util.assign,
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'clone': util.clone,
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'curry': util.curry,
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'forEach': util.forEach,
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'isArray': util.isArray,
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'isError': util.isError,
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'isFunction': util.isFunction,
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'isWeakMap': util.isWeakMap,
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'iteratee': util.iteratee,
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'keys': util.keys,
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'rearg': util.rearg,
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'toInteger': util.toInteger,
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'toPath': util.toPath
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};
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var ary = helpers.ary,
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assign = helpers.assign,
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clone = helpers.clone,
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curry = helpers.curry,
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each = helpers.forEach,
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isArray = helpers.isArray,
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isError = helpers.isError,
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isFunction = helpers.isFunction,
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isWeakMap = helpers.isWeakMap,
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keys = helpers.keys,
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rearg = helpers.rearg,
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toInteger = helpers.toInteger,
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toPath = helpers.toPath;
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var aryMethodKeys = keys(mapping.aryMethod);
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var wrappers = {
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'castArray': function(castArray) {
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return function() {
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var value = arguments[0];
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return isArray(value)
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? castArray(cloneArray(value))
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: castArray.apply(undefined, arguments);
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};
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},
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'iteratee': function(iteratee) {
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return function() {
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var func = arguments[0],
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arity = arguments[1],
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result = iteratee(func, arity),
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length = result.length;
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if (config.cap && typeof arity == 'number') {
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arity = arity > 2 ? (arity - 2) : 1;
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return (length && length <= arity) ? result : baseAry(result, arity);
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}
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return result;
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};
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},
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'mixin': function(mixin) {
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return function(source) {
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var func = this;
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if (!isFunction(func)) {
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return mixin(func, Object(source));
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}
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var pairs = [];
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each(keys(source), function(key) {
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if (isFunction(source[key])) {
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pairs.push([key, func.prototype[key]]);
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}
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});
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mixin(func, Object(source));
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each(pairs, function(pair) {
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var value = pair[1];
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if (isFunction(value)) {
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func.prototype[pair[0]] = value;
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} else {
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delete func.prototype[pair[0]];
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}
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});
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return func;
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};
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},
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'nthArg': function(nthArg) {
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return function(n) {
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var arity = n < 0 ? 1 : (toInteger(n) + 1);
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return curry(nthArg(n), arity);
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};
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},
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'rearg': function(rearg) {
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return function(func, indexes) {
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var arity = indexes ? indexes.length : 0;
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return curry(rearg(func, indexes), arity);
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};
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},
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'runInContext': function(runInContext) {
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return function(context) {
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return baseConvert(util, runInContext(context), options);
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};
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}
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};
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/*--------------------------------------------------------------------------*/
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/**
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* Casts `func` to a function with an arity capped iteratee if needed.
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*
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* @private
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* @param {string} name The name of the function to inspect.
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* @param {Function} func The function to inspect.
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* @returns {Function} Returns the cast function.
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*/
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function castCap(name, func) {
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if (config.cap) {
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var indexes = mapping.iterateeRearg[name];
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if (indexes) {
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return iterateeRearg(func, indexes);
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}
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var n = !isLib && mapping.iterateeAry[name];
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if (n) {
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return iterateeAry(func, n);
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}
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}
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return func;
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}
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/**
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* Casts `func` to a curried function if needed.
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*
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* @private
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* @param {string} name The name of the function to inspect.
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* @param {Function} func The function to inspect.
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* @param {number} n The arity of `func`.
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* @returns {Function} Returns the cast function.
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*/
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function castCurry(name, func, n) {
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return (forceCurry || (config.curry && n > 1))
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? curry(func, n)
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: func;
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}
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/**
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* Casts `func` to a fixed arity function if needed.
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*
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* @private
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* @param {string} name The name of the function to inspect.
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* @param {Function} func The function to inspect.
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* @param {number} n The arity cap.
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* @returns {Function} Returns the cast function.
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*/
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function castFixed(name, func, n) {
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if (config.fixed && (forceFixed || !mapping.skipFixed[name])) {
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var data = mapping.methodSpread[name],
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start = data && data.start;
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return start === undefined ? ary(func, n) : flatSpread(func, start);
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}
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return func;
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}
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/**
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* Casts `func` to an rearged function if needed.
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*
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* @private
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* @param {string} name The name of the function to inspect.
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* @param {Function} func The function to inspect.
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* @param {number} n The arity of `func`.
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* @returns {Function} Returns the cast function.
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*/
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function castRearg(name, func, n) {
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return (config.rearg && n > 1 && (forceRearg || !mapping.skipRearg[name]))
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? rearg(func, mapping.methodRearg[name] || mapping.aryRearg[n])
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: func;
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}
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/**
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* Creates a clone of `object` by `path`.
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*
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* @private
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* @param {Object} object The object to clone.
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* @param {Array|string} path The path to clone by.
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* @returns {Object} Returns the cloned object.
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*/
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function cloneByPath(object, path) {
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path = toPath(path);
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var index = -1,
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length = path.length,
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lastIndex = length - 1,
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result = clone(Object(object)),
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nested = result;
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while (nested != null && ++index < length) {
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var key = path[index],
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value = nested[key];
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if (value != null &&
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!(isFunction(value) || isError(value) || isWeakMap(value))) {
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nested[key] = clone(index == lastIndex ? value : Object(value));
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}
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nested = nested[key];
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}
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return result;
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}
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/**
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* Converts `lodash` to an immutable auto-curried iteratee-first data-last
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* version with conversion `options` applied.
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*
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* @param {Object} [options] The options object. See `baseConvert` for more details.
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* @returns {Function} Returns the converted `lodash`.
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*/
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function convertLib(options) {
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return _.runInContext.convert(options)(undefined);
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}
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/**
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* Create a converter function for `func` of `name`.
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*
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* @param {string} name The name of the function to convert.
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* @param {Function} func The function to convert.
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* @returns {Function} Returns the new converter function.
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*/
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function createConverter(name, func) {
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var realName = mapping.aliasToReal[name] || name,
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methodName = mapping.remap[realName] || realName,
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oldOptions = options;
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return function(options) {
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var newUtil = isLib ? pristine : helpers,
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newFunc = isLib ? pristine[methodName] : func,
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newOptions = assign(assign({}, oldOptions), options);
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return baseConvert(newUtil, realName, newFunc, newOptions);
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};
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}
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/**
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* Creates a function that wraps `func` to invoke its iteratee, with up to `n`
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* arguments, ignoring any additional arguments.
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*
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* @private
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* @param {Function} func The function to cap iteratee arguments for.
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* @param {number} n The arity cap.
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* @returns {Function} Returns the new function.
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*/
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function iterateeAry(func, n) {
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return overArg(func, function(func) {
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return typeof func == 'function' ? baseAry(func, n) : func;
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});
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}
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/**
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* Creates a function that wraps `func` to invoke its iteratee with arguments
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* arranged according to the specified `indexes` where the argument value at
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* the first index is provided as the first argument, the argument value at
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* the second index is provided as the second argument, and so on.
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*
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* @private
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* @param {Function} func The function to rearrange iteratee arguments for.
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* @param {number[]} indexes The arranged argument indexes.
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* @returns {Function} Returns the new function.
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*/
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function iterateeRearg(func, indexes) {
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return overArg(func, function(func) {
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var n = indexes.length;
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return baseArity(rearg(baseAry(func, n), indexes), n);
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});
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}
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/**
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* Creates a function that invokes `func` with its first argument transformed.
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*
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* @private
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* @param {Function} func The function to wrap.
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* @param {Function} transform The argument transform.
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* @returns {Function} Returns the new function.
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*/
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function overArg(func, transform) {
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return function() {
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var length = arguments.length;
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if (!length) {
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return func();
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}
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var args = Array(length);
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while (length--) {
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args[length] = arguments[length];
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}
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var index = config.rearg ? 0 : (length - 1);
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args[index] = transform(args[index]);
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return func.apply(undefined, args);
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};
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}
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/**
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* Creates a function that wraps `func` and applys the conversions
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* rules by `name`.
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*
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* @private
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* @param {string} name The name of the function to wrap.
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* @param {Function} func The function to wrap.
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* @returns {Function} Returns the converted function.
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*/
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function wrap(name, func, placeholder) {
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var result,
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realName = mapping.aliasToReal[name] || name,
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wrapped = func,
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wrapper = wrappers[realName];
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if (wrapper) {
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wrapped = wrapper(func);
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}
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else if (config.immutable) {
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if (mapping.mutate.array[realName]) {
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wrapped = wrapImmutable(func, cloneArray);
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}
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else if (mapping.mutate.object[realName]) {
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wrapped = wrapImmutable(func, createCloner(func));
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}
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else if (mapping.mutate.set[realName]) {
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wrapped = wrapImmutable(func, cloneByPath);
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}
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}
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each(aryMethodKeys, function(aryKey) {
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each(mapping.aryMethod[aryKey], function(otherName) {
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if (realName == otherName) {
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var data = mapping.methodSpread[realName],
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afterRearg = data && data.afterRearg;
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result = afterRearg
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? castFixed(realName, castRearg(realName, wrapped, aryKey), aryKey)
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: castRearg(realName, castFixed(realName, wrapped, aryKey), aryKey);
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result = castCap(realName, result);
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result = castCurry(realName, result, aryKey);
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return false;
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}
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});
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return !result;
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});
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result || (result = wrapped);
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if (result == func) {
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result = forceCurry ? curry(result, 1) : function() {
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return func.apply(this, arguments);
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};
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}
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result.convert = createConverter(realName, func);
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result.placeholder = func.placeholder = placeholder;
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return result;
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}
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/*--------------------------------------------------------------------------*/
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if (!isObj) {
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return wrap(name, func, defaultHolder);
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}
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var _ = func;
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// Convert methods by ary cap.
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var pairs = [];
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each(aryMethodKeys, function(aryKey) {
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each(mapping.aryMethod[aryKey], function(key) {
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var func = _[mapping.remap[key] || key];
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if (func) {
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pairs.push([key, wrap(key, func, _)]);
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}
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});
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});
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// Convert remaining methods.
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each(keys(_), function(key) {
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var func = _[key];
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if (typeof func == 'function') {
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var length = pairs.length;
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while (length--) {
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if (pairs[length][0] == key) {
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return;
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}
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}
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func.convert = createConverter(key, func);
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pairs.push([key, func]);
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}
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});
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|
|
|
// Assign to `_` leaving `_.prototype` unchanged to allow chaining.
|
|
each(pairs, function(pair) {
|
|
_[pair[0]] = pair[1];
|
|
});
|
|
|
|
_.convert = convertLib;
|
|
_.placeholder = _;
|
|
|
|
// Assign aliases.
|
|
each(keys(_), function(key) {
|
|
each(mapping.realToAlias[key] || [], function(alias) {
|
|
_[alias] = _[key];
|
|
});
|
|
});
|
|
|
|
return _;
|
|
}
|
|
|
|
module.exports = baseConvert;
|