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authorFlorian Dold <florian.dold@gmail.com>2018-09-20 02:56:13 +0200
committerFlorian Dold <florian.dold@gmail.com>2018-09-20 02:56:13 +0200
commitbbff7403fbf46f9ad92240ac213df8d30ef31b64 (patch)
treec58400ec5124da1c7d56b01aea83309f80a56c3b /node_modules/fbjs/lib/UnicodeBidiDirection.js.flow
parent003fb34971cf63466184351b4db5f7c67df4f444 (diff)
update packages
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-/**
- * Copyright (c) 2013-present, Facebook, Inc.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- * @providesModule UnicodeBidiDirection
- * @typechecks
- * @flow
- */
-
-/**
- * Constants to represent text directionality
- *
- * Also defines a *global* direciton, to be used in bidi algorithms as a
- * default fallback direciton, when no better direction is found or provided.
- *
- * NOTE: Use `setGlobalDir()`, or update `initGlobalDir()`, to set the initial
- * global direction value based on the application.
- *
- * Part of the implementation of Unicode Bidirectional Algorithm (UBA)
- * Unicode Standard Annex #9 (UAX9)
- * http://www.unicode.org/reports/tr9/
- */
-
-'use strict';
-
-const invariant = require('./invariant');
-
-export type BidiDirection = 'LTR' | 'RTL' | 'NEUTRAL';
-export type HTMLDir = 'ltr' | 'rtl';
-
-const NEUTRAL = 'NEUTRAL'; // No strong direction
-const LTR = 'LTR'; // Left-to-Right direction
-const RTL = 'RTL'; // Right-to-Left direction
-
-let globalDir: ?BidiDirection = null;
-
-// == Helpers ==
-
-/**
- * Check if a directionality value is a Strong one
- */
-function isStrong(dir: BidiDirection): boolean {
- return dir === LTR || dir === RTL;
-}
-
-/**
- * Get string value to be used for `dir` HTML attribute or `direction` CSS
- * property.
- */
-function getHTMLDir(dir: BidiDirection): HTMLDir {
- invariant(isStrong(dir), '`dir` must be a strong direction to be converted to HTML Direction');
- return dir === LTR ? 'ltr' : 'rtl';
-}
-
-/**
- * Get string value to be used for `dir` HTML attribute or `direction` CSS
- * property, but returns null if `dir` has same value as `otherDir`.
- * `null`.
- */
-function getHTMLDirIfDifferent(dir: BidiDirection, otherDir: BidiDirection): ?HTMLDir {
- invariant(isStrong(dir), '`dir` must be a strong direction to be converted to HTML Direction');
- invariant(isStrong(otherDir), '`otherDir` must be a strong direction to be converted to HTML Direction');
- return dir === otherDir ? null : getHTMLDir(dir);
-}
-
-// == Global Direction ==
-
-/**
- * Set the global direction.
- */
-function setGlobalDir(dir: BidiDirection): void {
- globalDir = dir;
-}
-
-/**
- * Initialize the global direction
- */
-function initGlobalDir(): void {
- setGlobalDir(LTR);
-}
-
-/**
- * Get the global direction
- */
-function getGlobalDir(): BidiDirection {
- if (!globalDir) {
- this.initGlobalDir();
- }
- invariant(globalDir, 'Global direction not set.');
- return globalDir;
-}
-
-const UnicodeBidiDirection = {
- // Values
- NEUTRAL,
- LTR,
- RTL,
- // Helpers
- isStrong,
- getHTMLDir,
- getHTMLDirIfDifferent,
- // Global Direction
- setGlobalDir,
- initGlobalDir,
- getGlobalDir
-};
-
-module.exports = UnicodeBidiDirection; \ No newline at end of file