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Diffstat (limited to 'node_modules/react-dom/lib/traverseAllChildren.js')
| -rw-r--r-- | node_modules/react-dom/lib/traverseAllChildren.js | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/traverseAllChildren.js b/node_modules/react-dom/lib/traverseAllChildren.js new file mode 100644 index 000000000..008ab088a --- /dev/null +++ b/node_modules/react-dom/lib/traverseAllChildren.js @@ -0,0 +1,175 @@ +/** + * 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 _prodInvariant = require('./reactProdInvariant'); + +var ReactCurrentOwner = require('react/lib/ReactCurrentOwner'); +var REACT_ELEMENT_TYPE = require('./ReactElementSymbol'); + +var getIteratorFn = require('./getIteratorFn'); +var invariant = require('fbjs/lib/invariant'); +var KeyEscapeUtils = require('./KeyEscapeUtils'); +var warning = require('fbjs/lib/warning'); + +var SEPARATOR = '.'; +var SUBSEPARATOR = ':'; + +/** + * This is inlined from ReactElement since this file is shared between + * isomorphic and renderers. We could extract this to a + * + */ + +/** + * TODO: Test that a single child and an array with one item have the same key + * pattern. + */ + +var didWarnAboutMaps = false; + +/** + * Generate a key string that identifies a component within a set. + * + * @param {*} component A component that could contain a manual key. + * @param {number} index Index that is used if a manual key is not provided. + * @return {string} + */ +function getComponentKey(component, index) { + // Do some typechecking here since we call this blindly. We want to ensure + // that we don't block potential future ES APIs. + if (component && typeof component === 'object' && component.key != null) { + // Explicit key + return KeyEscapeUtils.escape(component.key); + } + // Implicit key determined by the index in the set + return index.toString(36); +} + +/** + * @param {?*} children Children tree container. + * @param {!string} nameSoFar Name of the key path so far. + * @param {!function} callback Callback to invoke with each child found. + * @param {?*} traverseContext Used to pass information throughout the traversal + * process. + * @return {!number} The number of children in this subtree. + */ +function traverseAllChildrenImpl(children, nameSoFar, callback, traverseContext) { + var type = typeof children; + + if (type === 'undefined' || type === 'boolean') { + // All of the above are perceived as null. + children = null; + } + + if (children === null || type === 'string' || type === 'number' || + // The following is inlined from ReactElement. This means we can optimize + // some checks. React Fiber also inlines this logic for similar purposes. + type === 'object' && children.$$typeof === REACT_ELEMENT_TYPE) { + callback(traverseContext, children, + // If it's the only child, treat the name as if it was wrapped in an array + // so that it's consistent if the number of children grows. + nameSoFar === '' ? SEPARATOR + getComponentKey(children, 0) : nameSoFar); + return 1; + } + + var child; + var nextName; + var subtreeCount = 0; // Count of children found in the current subtree. + var nextNamePrefix = nameSoFar === '' ? SEPARATOR : nameSoFar + SUBSEPARATOR; + + if (Array.isArray(children)) { + for (var i = 0; i < children.length; i++) { + child = children[i]; + nextName = nextNamePrefix + getComponentKey(child, i); + subtreeCount += traverseAllChildrenImpl(child, nextName, callback, traverseContext); + } + } else { + var iteratorFn = getIteratorFn(children); + if (iteratorFn) { + var iterator = iteratorFn.call(children); + var step; + if (iteratorFn !== children.entries) { + var ii = 0; + while (!(step = iterator.next()).done) { + child = step.value; + nextName = nextNamePrefix + getComponentKey(child, ii++); + subtreeCount += traverseAllChildrenImpl(child, nextName, callback, traverseContext); + } + } else { + if (process.env.NODE_ENV !== 'production') { + var mapsAsChildrenAddendum = ''; + if (ReactCurrentOwner.current) { + var mapsAsChildrenOwnerName = ReactCurrentOwner.current.getName(); + if (mapsAsChildrenOwnerName) { + mapsAsChildrenAddendum = ' Check the render method of `' + mapsAsChildrenOwnerName + '`.'; + } + } + process.env.NODE_ENV !== 'production' ? warning(didWarnAboutMaps, 'Using Maps as children is not yet fully supported. It is an ' + 'experimental feature that might be removed. Convert it to a ' + 'sequence / iterable of keyed ReactElements instead.%s', mapsAsChildrenAddendum) : void 0; + didWarnAboutMaps = true; + } + // Iterator will provide entry [k,v] tuples rather than values. + while (!(step = iterator.next()).done) { + var entry = step.value; + if (entry) { + child = entry[1]; + nextName = nextNamePrefix + KeyEscapeUtils.escape(entry[0]) + SUBSEPARATOR + getComponentKey(child, 0); + subtreeCount += traverseAllChildrenImpl(child, nextName, callback, traverseContext); + } + } + } + } else if (type === 'object') { + var addendum = ''; + if (process.env.NODE_ENV !== 'production') { + addendum = ' If you meant to render a collection of children, use an array ' + 'instead or wrap the object using createFragment(object) from the ' + 'React add-ons.'; + if (children._isReactElement) { + addendum = ' It looks like you\'re using an element created by a different ' + 'version of React. Make sure to use only one copy of React.'; + } + if (ReactCurrentOwner.current) { + var name = ReactCurrentOwner.current.getName(); + if (name) { + addendum += ' Check the render method of `' + name + '`.'; + } + } + } + var childrenString = String(children); + !false ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Objects are not valid as a React child (found: %s).%s', childrenString === '[object Object]' ? 'object with keys {' + Object.keys(children).join(', ') + '}' : childrenString, addendum) : _prodInvariant('31', childrenString === '[object Object]' ? 'object with keys {' + Object.keys(children).join(', ') + '}' : childrenString, addendum) : void 0; + } + } + + return subtreeCount; +} + +/** + * Traverses children that are typically specified as `props.children`, but + * might also be specified through attributes: + * + * - `traverseAllChildren(this.props.children, ...)` + * - `traverseAllChildren(this.props.leftPanelChildren, ...)` + * + * The `traverseContext` is an optional argument that is passed through the + * entire traversal. It can be used to store accumulations or anything else that + * the callback might find relevant. + * + * @param {?*} children Children tree object. + * @param {!function} callback To invoke upon traversing each child. + * @param {?*} traverseContext Context for traversal. + * @return {!number} The number of children in this subtree. + */ +function traverseAllChildren(children, callback, traverseContext) { + if (children == null) { + return 0; + } + + return traverseAllChildrenImpl(children, '', callback, traverseContext); +} + +module.exports = traverseAllChildren;
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