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author | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
commit | de98e0b232509d5f40c135d540a70e415272ff85 (patch) | |
tree | a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/react-dom/lib/FallbackCompositionState.js | |
parent | e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff) | |
download | wallet-core-de98e0b232509d5f40c135d540a70e415272ff85.tar.xz |
node_modules
Diffstat (limited to 'node_modules/react-dom/lib/FallbackCompositionState.js')
-rw-r--r-- | node_modules/react-dom/lib/FallbackCompositionState.js | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/FallbackCompositionState.js b/node_modules/react-dom/lib/FallbackCompositionState.js new file mode 100644 index 000000000..43c0a1c92 --- /dev/null +++ b/node_modules/react-dom/lib/FallbackCompositionState.js @@ -0,0 +1,94 @@ +/** + * 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 _assign = require('object-assign'); + +var PooledClass = require('./PooledClass'); + +var getTextContentAccessor = require('./getTextContentAccessor'); + +/** + * This helper class stores information about text content of a target node, + * allowing comparison of content before and after a given event. + * + * Identify the node where selection currently begins, then observe + * both its text content and its current position in the DOM. Since the + * browser may natively replace the target node during composition, we can + * use its position to find its replacement. + * + * @param {DOMEventTarget} root + */ +function FallbackCompositionState(root) { + this._root = root; + this._startText = this.getText(); + this._fallbackText = null; +} + +_assign(FallbackCompositionState.prototype, { + destructor: function () { + this._root = null; + this._startText = null; + this._fallbackText = null; + }, + + /** + * Get current text of input. + * + * @return {string} + */ + getText: function () { + if ('value' in this._root) { + return this._root.value; + } + return this._root[getTextContentAccessor()]; + }, + + /** + * Determine the differing substring between the initially stored + * text content and the current content. + * + * @return {string} + */ + getData: function () { + if (this._fallbackText) { + return this._fallbackText; + } + + var start; + var startValue = this._startText; + var startLength = startValue.length; + var end; + var endValue = this.getText(); + var endLength = endValue.length; + + for (start = 0; start < startLength; start++) { + if (startValue[start] !== endValue[start]) { + break; + } + } + + var minEnd = startLength - start; + for (end = 1; end <= minEnd; end++) { + if (startValue[startLength - end] !== endValue[endLength - end]) { + break; + } + } + + var sliceTail = end > 1 ? 1 - end : undefined; + this._fallbackText = endValue.slice(start, sliceTail); + return this._fallbackText; + } +}); + +PooledClass.addPoolingTo(FallbackCompositionState); + +module.exports = FallbackCompositionState;
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