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/**
* Copyright 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*/
'use strict';
var PooledClass = require('./PooledClass');
var ReactElement = require('./ReactElement');
var emptyFunction = require('fbjs/lib/emptyFunction');
var traverseAllChildren = require('./traverseAllChildren');
var twoArgumentPooler = PooledClass.twoArgumentPooler;
var fourArgumentPooler = PooledClass.fourArgumentPooler;
var userProvidedKeyEscapeRegex = /\/+/g;
function escapeUserProvidedKey(text) {
return ('' + text).replace(userProvidedKeyEscapeRegex, '$&/');
}
/**
* PooledClass representing the bookkeeping associated with performing a child
* traversal. Allows avoiding binding callbacks.
*
* @constructor ForEachBookKeeping
* @param {!function} forEachFunction Function to perform traversal with.
* @param {?*} forEachContext Context to perform context with.
*/
function ForEachBookKeeping(forEachFunction, forEachContext) {
this.func = forEachFunction;
this.context = forEachContext;
this.count = 0;
}
ForEachBookKeeping.prototype.destructor = function () {
this.func = null;
this.context = null;
this.count = 0;
};
PooledClass.addPoolingTo(ForEachBookKeeping, twoArgumentPooler);
function forEachSingleChild(bookKeeping, child, name) {
var func = bookKeeping.func,
context = bookKeeping.context;
func.call(context, child, bookKeeping.count++);
}
/**
* Iterates through children that are typically specified as `props.children`.
*
* See https://facebook.github.io/react/docs/top-level-api.html#react.children.foreach
*
* The provided forEachFunc(child, index) will be called for each
* leaf child.
*
* @param {?*} children Children tree container.
* @param {function(*, int)} forEachFunc
* @param {*} forEachContext Context for forEachContext.
*/
function forEachChildren(children, forEachFunc, forEachContext) {
if (children == null) {
return children;
}
var traverseContext = ForEachBookKeeping.getPooled(forEachFunc, forEachContext);
traverseAllChildren(children, forEachSingleChild, traverseContext);
ForEachBookKeeping.release(traverseContext);
}
/**
* PooledClass representing the bookkeeping associated with performing a child
* mapping. Allows avoiding binding callbacks.
*
* @constructor MapBookKeeping
* @param {!*} mapResult Object containing the ordered map of results.
* @param {!function} mapFunction Function to perform mapping with.
* @param {?*} mapContext Context to perform mapping with.
*/
function MapBookKeeping(mapResult, keyPrefix, mapFunction, mapContext) {
this.result = mapResult;
this.keyPrefix = keyPrefix;
this.func = mapFunction;
this.context = mapContext;
this.count = 0;
}
MapBookKeeping.prototype.destructor = function () {
this.result = null;
this.keyPrefix = null;
this.func = null;
this.context = null;
this.count = 0;
};
PooledClass.addPoolingTo(MapBookKeeping, fourArgumentPooler);
function mapSingleChildIntoContext(bookKeeping, child, childKey) {
var result = bookKeeping.result,
keyPrefix = bookKeeping.keyPrefix,
func = bookKeeping.func,
context = bookKeeping.context;
var mappedChild = func.call(context, child, bookKeeping.count++);
if (Array.isArray(mappedChild)) {
mapIntoWithKeyPrefixInternal(mappedChild, result, childKey, emptyFunction.thatReturnsArgument);
} else if (mappedChild != null) {
if (ReactElement.isValidElement(mappedChild)) {
mappedChild = ReactElement.cloneAndReplaceKey(mappedChild,
// Keep both the (mapped) and old keys if they differ, just as
// traverseAllChildren used to do for objects as children
keyPrefix + (mappedChild.key && (!child || child.key !== mappedChild.key) ? escapeUserProvidedKey(mappedChild.key) + '/' : '') + childKey);
}
result.push(mappedChild);
}
}
function mapIntoWithKeyPrefixInternal(children, array, prefix, func, context) {
var escapedPrefix = '';
if (prefix != null) {
escapedPrefix = escapeUserProvidedKey(prefix) + '/';
}
var traverseContext = MapBookKeeping.getPooled(array, escapedPrefix, func, context);
traverseAllChildren(children, mapSingleChildIntoContext, traverseContext);
MapBookKeeping.release(traverseContext);
}
/**
* Maps children that are typically specified as `props.children`.
*
* See https://facebook.github.io/react/docs/top-level-api.html#react.children.map
*
* The provided mapFunction(child, key, index) will be called for each
* leaf child.
*
* @param {?*} children Children tree container.
* @param {function(*, int)} func The map function.
* @param {*} context Context for mapFunction.
* @return {object} Object containing the ordered map of results.
*/
function mapChildren(children, func, context) {
if (children == null) {
return children;
}
var result = [];
mapIntoWithKeyPrefixInternal(children, result, null, func, context);
return result;
}
function forEachSingleChildDummy(traverseContext, child, name) {
return null;
}
/**
* Count the number of children that are typically specified as
* `props.children`.
*
* See https://facebook.github.io/react/docs/top-level-api.html#react.children.count
*
* @param {?*} children Children tree container.
* @return {number} The number of children.
*/
function countChildren(children, context) {
return traverseAllChildren(children, forEachSingleChildDummy, null);
}
/**
* Flatten a children object (typically specified as `props.children`) and
* return an array with appropriately re-keyed children.
*
* See https://facebook.github.io/react/docs/top-level-api.html#react.children.toarray
*/
function toArray(children) {
var result = [];
mapIntoWithKeyPrefixInternal(children, result, null, emptyFunction.thatReturnsArgument);
return result;
}
var ReactChildren = {
forEach: forEachChildren,
map: mapChildren,
mapIntoWithKeyPrefixInternal: mapIntoWithKeyPrefixInternal,
count: countChildren,
toArray: toArray
};
module.exports = ReactChildren;
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