This app provides monitoring and information features for the common freifunk user and the technical stuff of a freifunk community.
Code base is taken from a TUM Practical Course project and added here to see if Freifunk Altdorf can use it.
https://www.freifunk-altdorf.de
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110 lines
2.7 KiB
110 lines
2.7 KiB
/** |
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* Copyright (c) 2013-present, Facebook, Inc. |
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* |
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* This source code is licensed under the MIT license found in the |
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* LICENSE file in the root directory of this source tree. |
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* |
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* @providesModule UnicodeBidiDirection |
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* @typechecks |
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* @flow |
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*/ |
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/** |
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* Constants to represent text directionality |
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* |
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* Also defines a *global* direciton, to be used in bidi algorithms as a |
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* default fallback direciton, when no better direction is found or provided. |
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* |
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* NOTE: Use `setGlobalDir()`, or update `initGlobalDir()`, to set the initial |
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* global direction value based on the application. |
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* |
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* Part of the implementation of Unicode Bidirectional Algorithm (UBA) |
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* Unicode Standard Annex #9 (UAX9) |
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* http://www.unicode.org/reports/tr9/ |
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*/ |
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'use strict'; |
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const invariant = require('./invariant'); |
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export type BidiDirection = 'LTR' | 'RTL' | 'NEUTRAL'; |
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export type HTMLDir = 'ltr' | 'rtl'; |
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const NEUTRAL = 'NEUTRAL'; // No strong direction |
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const LTR = 'LTR'; // Left-to-Right direction |
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const RTL = 'RTL'; // Right-to-Left direction |
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let globalDir: ?BidiDirection = null; |
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// == Helpers == |
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/** |
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* Check if a directionality value is a Strong one |
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*/ |
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function isStrong(dir: BidiDirection): boolean { |
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return dir === LTR || dir === RTL; |
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} |
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/** |
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* Get string value to be used for `dir` HTML attribute or `direction` CSS |
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* property. |
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*/ |
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function getHTMLDir(dir: BidiDirection): HTMLDir { |
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invariant(isStrong(dir), '`dir` must be a strong direction to be converted to HTML Direction'); |
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return dir === LTR ? 'ltr' : 'rtl'; |
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} |
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/** |
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* Get string value to be used for `dir` HTML attribute or `direction` CSS |
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* property, but returns null if `dir` has same value as `otherDir`. |
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* `null`. |
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*/ |
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function getHTMLDirIfDifferent(dir: BidiDirection, otherDir: BidiDirection): ?HTMLDir { |
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invariant(isStrong(dir), '`dir` must be a strong direction to be converted to HTML Direction'); |
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invariant(isStrong(otherDir), '`otherDir` must be a strong direction to be converted to HTML Direction'); |
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return dir === otherDir ? null : getHTMLDir(dir); |
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} |
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// == Global Direction == |
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/** |
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* Set the global direction. |
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*/ |
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function setGlobalDir(dir: BidiDirection): void { |
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globalDir = dir; |
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} |
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/** |
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* Initialize the global direction |
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*/ |
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function initGlobalDir(): void { |
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setGlobalDir(LTR); |
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} |
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/** |
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* Get the global direction |
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*/ |
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function getGlobalDir(): BidiDirection { |
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if (!globalDir) { |
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this.initGlobalDir(); |
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} |
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invariant(globalDir, 'Global direction not set.'); |
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return globalDir; |
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} |
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const UnicodeBidiDirection = { |
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// Values |
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NEUTRAL, |
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LTR, |
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RTL, |
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// Helpers |
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isStrong, |
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getHTMLDir, |
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getHTMLDirIfDifferent, |
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// Global Direction |
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setGlobalDir, |
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initGlobalDir, |
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getGlobalDir |
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}; |
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module.exports = UnicodeBidiDirection; |