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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| /** | ||
| * Copyright (c) 2018 The xterm.js authors. All rights reserved. | ||
| * @license MIT | ||
| */ | ||
| import { IUnicodeImplementation, IUnicodeProvider } from './Types'; | ||
| import { v6 } from './unicode/v6'; | ||
| import { v11 } from './unicode/v11'; | ||
|
|
||
| /** | ||
| * Class to provide access to different unicode version implementations. | ||
| * | ||
| * The version related implementations are stored statically | ||
| * to avoid recreating them for every single instance. | ||
| * | ||
| * An instance of this class is meant to serve unicode specific implementations | ||
| * for a single terminal instance. This way multiple terminals can have | ||
| * different unicode settings active while still referring to the | ||
| * same underlying implementations. | ||
| */ | ||
| export class UnicodeProvider implements IUnicodeProvider { | ||
| static versions: {[key: string]: IUnicodeImplementation} = {}; | ||
| private static _registerCallbacks: ((version: number) => void)[] = []; | ||
|
|
||
| static onRegister(callback: (version: number) => void): void { | ||
| UnicodeProvider._registerCallbacks.push(callback); | ||
| } | ||
|
|
||
| /** | ||
| * Register an unicode implementation. | ||
| * Possible entry point for unicode addons. | ||
| * In conjuction with `onRegister` it can be used | ||
| * to load implementations lazy. | ||
| */ | ||
| static registerVersion(impl: IUnicodeImplementation): void { | ||
| if (UnicodeProvider.versions[impl.version]) { | ||
| throw new Error(`unicode version "${impl.version}" already registered`); | ||
| } | ||
| UnicodeProvider.versions[impl.version] = impl; | ||
| UnicodeProvider._registerCallbacks.forEach(cb => cb(impl.version)); | ||
| } | ||
|
|
||
| static registeredVersions(): number[] { | ||
| return Object.getOwnPropertyNames(UnicodeProvider.versions).map(parseFloat).sort((a, b) => a - b); | ||
| } | ||
|
|
||
| private _version: number; | ||
| public wcwidth: (ucs: number) => number; | ||
|
|
||
| // defaults to the highest available version | ||
| constructor(version: number = 20) { | ||
| this.setActiveVersion(version); | ||
| } | ||
|
|
||
| /** | ||
| * Callback to run when a version got registered. | ||
| * Gets the newly registered version and | ||
| * the `UnicodeProvider` instance as arguments. | ||
| */ | ||
| public onRegister(callback: (version: number, provider: UnicodeProvider) => void): void { | ||
| UnicodeProvider.onRegister((version) => callback(version, this)); | ||
| } | ||
|
|
||
| /** | ||
| * Get a list of currently registered unicode versions. | ||
| */ | ||
| public registeredVersions(): number[] { | ||
| return Object.getOwnPropertyNames(UnicodeProvider.versions).map(parseFloat).sort((a, b) => a - b); | ||
| } | ||
|
|
||
| /** | ||
| * Get the currently active unicode version. | ||
| */ | ||
| public getActiveVersion(): number { | ||
| return this._version; | ||
| } | ||
|
|
||
| /** | ||
| * Activate a registered unicode version. By default the closest version will be activated | ||
| * (can be higher or lower). Setting `mode` to 'next' tries to get at least that version, | ||
| * 'previous' tries to get the closest lower version. | ||
| * Unless there is no version registered this method will always succeed. | ||
| * Returns the activated version number. | ||
| */ | ||
| public setActiveVersion(version: number, mode?: 'exact' | 'closest' | 'next' | 'previous'): number { | ||
| if (!this.registeredVersions().length) { | ||
| throw new Error('no unicode versions registered'); | ||
| } | ||
|
|
||
| // find closest matching version | ||
| // Although not quite correct for typical versioning schemes 5.9 is treated closer to 6.0 than to 5.7. | ||
| // Typically we will not ship subversions so this approximation should be close enough. | ||
| const versions = this.registeredVersions(); | ||
| const distances = versions.map(el => Math.abs(version - el)); | ||
| const closestIndex = distances.reduce((iMin, x, i, arr) => x < arr[iMin] ? i : iMin, 0); | ||
| let newVersion = versions[closestIndex]; | ||
|
|
||
| if (mode === 'exact') { | ||
| // exact version match requested | ||
| if (version !== newVersion) { | ||
| throw new Error(`unicode version "${version}" not registered`); | ||
| } | ||
| } else { | ||
| // take the higher one if available | ||
| if (mode === 'next') { | ||
| if (newVersion < version && closestIndex < versions.length - 1) { | ||
| newVersion = versions[closestIndex + 1]; | ||
| } | ||
| // take the lower one if available | ||
| } else if (mode === 'previous') { | ||
| if (newVersion > version && closestIndex) { | ||
| newVersion = versions[closestIndex - 1]; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // swap wcwidth impl | ||
| this.wcwidth = UnicodeProvider.versions[newVersion].wcwidth; | ||
| this._version = newVersion; | ||
| return this._version; | ||
| } | ||
|
|
||
| /** | ||
| * Get the terminal cell width for a string. | ||
| */ | ||
| public getStringCellWidth(s: string): number { | ||
| let result = 0; | ||
| for (let i = 0; i < s.length; ++i) { | ||
| let code = s.charCodeAt(i); | ||
| if (0xD800 <= code && code <= 0xDBFF) { | ||
| const low = s.charCodeAt(i + 1); | ||
| if (isNaN(low)) { | ||
| return result; | ||
| } | ||
| code = ((code - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000; | ||
| } | ||
| if (0xDC00 <= code && code <= 0xDFFF) { | ||
| continue; | ||
| } | ||
| result += this.wcwidth(code); | ||
| } | ||
| return result; | ||
| } | ||
| } | ||
|
|
||
| // register statically shipped versions | ||
| UnicodeProvider.registerVersion(v6); | ||
| UnicodeProvider.registerVersion(v11); |
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