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carbon-components-angular

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import { Injectable } from "@angular/core"; import { BehaviorSubject, isObservable, iif } from "rxjs"; import { map } from "rxjs/operators"; import { merge } from "carbon-components-angular/utils"; import EN from "./en"; import * as i0 from "@angular/core"; /** * Takes the `Observable` returned from `i18n.get` and an object of variables to replace. * * The keys specify the variable name in the string. * * Example: * ```typescript * service.set({ "TEST": "{{foo}} {{bar}}" }); * * service.replace(service.get("TEST"), { foo: "test", bar: "asdf" }) * ``` * * Produces: `"test asdf"` * * @param subject the translation to replace variables on * @param variables object of variables to replace */ export const replace = (subject, variables) => subject.pipe(map(str => { const keys = Object.keys(variables); for (const key of keys) { const value = variables[key]; str = str.replace(new RegExp(`{{\\s*${key}\\s*}}`, "g"), value); } return str; })); /** * Represents an "overridable" translation value. * * Largely an internal usecase. There are situations where we want an `Observable` that * can emit events from a centralized source **OR** an `Observable` that will emit events * from a component local source. The key example being on/off text in a `Toggle` - In some cases * we want the `Toggle` to use `I18n`s global translations, but in others we'd prefer to use a local * override. We don't ever need to return to a non-overridden state, but we do need the ability to * switch _to_ an overridden sate. */ export class Overridable { constructor(path, i18n) { this.path = path; this.i18n = i18n; /** * Our base non-overridden translation. */ this.baseTranslation = this.i18n.get(this.path); /** * A boolean to flip between overridden and non-overridden states. */ this.isOverridden = false; /** * ensure `$override` is initialized with the correct default value * in some cases `_value` can get changed for an `Observable` before `$override` is created */ const value = this.i18n.getValueFromPath(this.path); this.$override = new BehaviorSubject(value); this._value = value; } /** * The raw value of the translation. Defaults to the string value, but will return the value passed to `override` * * @readonly */ get value() { return this._value; } set value(v) { this.override(v); } /** * The translation subject. Returns either a stream of overridden values, or our base translation values. * * @readonly */ get subject() { /** * since inputs are bound on template instantiation (and thusly will always have _some_ value) * We can use a simple boolean and the `iif` function to determine which subject to return on subscription */ return iif(() => this.isOverridden, this.$override, this.baseTranslation); } /** * Takes a string or an `Observable` that emits strings. * Overrides the value provided by the `I18n` service. */ override(value) { this.isOverridden = true; // To ensure that there are not multiple subscriptions created for the same observable, we // unsubscribe if a subscription already exists for an observable before creating a new one. if (this.subscription) { this.subscription.unsubscribe(); this.subscription = null; } this._value = value; if (isObservable(value)) { this.subscription = value.subscribe(v => { this.$override.next(v); }); } else { this.$override.next(value); } } } /** * The I18n service is a minimal internal singleton service used to supply our components with translated strings. * * All the components that support I18n also support directly passed strings. * Usage of I18n is optional, and it is not recommended for application use (libraries like ngx-translate * are a better choice) * */ export class I18n { constructor() { this.translationStrings = EN; this.translations = new Map(); this.locale = new BehaviorSubject("en"); } /** * Sets the locale and optionally the translation strings. Locale is used by components that * are already locale aware (datepicker for example) while the translation strings are used * for components that are not. * * Locales set here will override locales/languages set in components * @param language an ISO 639-1 language code - https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes * @param strings an object of strings, optional */ setLocale(language, strings) { this.locale.next(language); if (strings) { this.set(strings); } } /** * Returns the current locale */ getLocale() { return this.locale.value; } /** * Returns an observable that resolves to the current locale, and will update when changed */ getLocaleObservable() { return this.locale.asObservable(); } /** * Set/update the translations from an object. Also notifies all participating components of the update. * * @param strings an object of strings, should follow the same format as src/i18n/en.json */ set(strings) { this.translationStrings = merge({}, EN, strings); // iterate over all our tracked translations and update each observable const translations = Array.from(this.translations); for (const [path, subject] of translations) { subject.next(this.getValueFromPath(path)); } } /** * When a path is specified returns an observable that will resolve to the translation string value. * * Returns the full translations object if path is not specified. * * @param path optional, looks like `"NOTIFICATION.CLOSE_BUTTON"` */ get(path) { if (!path) { return this.translationStrings; } return this.getSubject(path); } /** * Returns all descendents of some path fragment as an object. * * @param partialPath a path fragment, for example `"NOTIFICATION"` */ getMultiple(partialPath) { const values = this.getValueFromPath(partialPath); const subjects = {}; for (const key of Object.keys(values)) { if (values[key] === Object(values[key])) { subjects[key] = this.getMultiple(`${partialPath}.${key}`); } else { subjects[key] = this.getSubject(`${partialPath}.${key}`); } } return subjects; } /** * Returns an instance of `Overridable` that can be used to optionally override the value provided by `I18n` * @param path looks like `"NOTIFICATION.CLOSE_BUTTON"` */ getOverridable(path) { return new Overridable(path, this); } /** * Takes the `Observable` returned from `i18n.get` and an object of variables to replace. * * The keys specify the variable name in the string. * * Example: * ``` * service.set({ "TEST": "{{foo}} {{bar}}" }); * * service.replace(service.get("TEST"), { foo: "test", bar: "asdf" }) * ``` * * Produces: `"test asdf"` * * @param subject the translation to replace variables on * @param variables object of variables to replace */ replace(subject, variables) { return replace(subject, variables); } /** * Trys to resolve a value from the provided path. * * @param path looks like `"NOTIFICATION.CLOSE_BUTTON"` */ getValueFromPath(path) { let value = this.translationStrings; for (const segment of path.split(".")) { if (value[segment] !== undefined && value[segment] !== null) { value = value[segment]; } else { throw new Error(`no key ${segment} at ${path}`); } } return value; } /** * Helper method that returns an observable from the internal cache based on the path * * @param path looks like `"NOTIFICATION.CLOSE_BUTTON"` */ getSubject(path) { try { // we run this here to validate the path exists before adding it to the translation map const value = this.getValueFromPath(path); if (this.translations.has(path)) { return this.translations.get(path); } const translation = new BehaviorSubject(value); this.translations.set(path, translation); return translation; } catch (error) { console.error(error); } } } I18n.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: I18n, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); I18n.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: I18n }); i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: I18n, decorators: [{ type: Injectable }] }); //# 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{ Injectable } from \"@angular/core\";\nimport {\n\tBehaviorSubject,\n\tObservable,\n\tisObservable,\n\tiif,\n\tSubscription\n} from \"rxjs\";\nimport { map } from \"rxjs/operators\";\nimport { merge } from \"carbon-components-angular/utils\";\n\nimport EN from \"./en\";\n\n/**\n * Takes the `Observable` returned from `i18n.get` and an object of variables to replace.\n *\n * The keys specify the variable name in the string.\n *\n * Example:\n * ```typescript\n * service.set({ \"TEST\": \"{{foo}} {{bar}}\" });\n *\n * service.replace(service.get(\"TEST\"), { foo: \"test\", bar: \"asdf\" })\n * ```\n *\n * Produces: `\"test asdf\"`\n *\n * @param subject the translation to replace variables on\n * @param variables object of variables to replace\n */\nexport const replace = (subject, variables) => subject.pipe(\n\tmap<string, void>(str => {\n\t\tconst keys = Object.keys(variables);\n\t\tfor (const key of keys) {\n\t\t\tconst value = variables[key];\n\t\t\tstr = str.replace(new RegExp(`{{\\\\s*${key}\\\\s*}}`, \"g\"), value);\n\t\t}\n\t\treturn str;\n\t})\n);\n\n/**\n * Represents an \"overridable\" translation value.\n *\n * Largely an internal usecase. There are situations where we want an `Observable` that\n * can emit events from a centralized source **OR** an `Observable` that will emit events\n * from a component local source. The key example being on/off text in a `Toggle` - In some cases\n * we want the `Toggle` to use `I18n`s global translations, but in others we'd prefer to use a local\n * override. We don't ever need to return to a non-overridden state, but we do need the ability to\n * switch _to_ an overridden sate.\n */\nexport class Overridable {\n\t/**\n\t * The raw value of the translation. Defaults to the string value, but will return the value passed to `override`\n\t *\n\t * @readonly\n\t */\n\tpublic get value(): string | Observable<string> {\n\t\treturn this._value;\n\t}\n\n\tpublic set value(v: string | Observable<string>) {\n\t\tthis.override(v);\n\t}\n\n\t/**\n\t * The translation subject. Returns either a stream of overridden values, or our base translation values.\n\t *\n\t * @readonly\n\t */\n\tpublic get subject(): Observable<string> {\n\t\t/**\n\t\t * since inputs are bound on template instantiation (and thusly will always have _some_ value)\n\t\t * We can use a simple boolean and the `iif` function to determine which subject to return on subscription\n\t\t */\n\t\treturn iif(() => this.isOverridden, this.$override, this.baseTranslation);\n\t}\n\n\t/**\n\t * Overridden value. Accessed by the readonly getter `value` and set through `override`\n\t */\n\tprotected _value: string | Observable<string>;\n\t/**\n\t * Subject of overridden values. Initialized with our default value.\n\t */\n\tprotected $override: BehaviorSubject<string>;\n\t/**\n\t * Our base non-overridden translation.\n\t */\n\tprotected baseTranslation: Observable<string> = this.i18n.get(this.path);\n\n\t/**\n\t * Subscription to the observable provided as an override (if any)\n\t */\n\tprotected subscription: Subscription;\n\t/**\n\t * A boolean to flip between overridden and non-overridden states.\n\t */\n\tprotected isOverridden = false;\n\n\tconstructor(protected path: string, protected i18n: I18n) {\n\t\t/**\n\t\t * ensure `$override` is initialized with the correct default value\n\t\t * in some cases `_value` can get changed for an `Observable` before `$override` is created\n\t\t */\n\t\tconst value = this.i18n.getValueFromPath(this.path) as string;\n\t\tthis.$override = new BehaviorSubject<string>(value);\n\t\tthis._value = value;\n\t}\n\t/**\n\t * Takes a string or an `Observable` that emits strings.\n\t * Overrides the value provided by the `I18n` service.\n\t */\n\toverride(value: string | Observable<string>) {\n\t\tthis.isOverridden = true;\n\t\t// To ensure that there are not multiple subscriptions created for the same observable, we\n\t\t// unsubscribe if a subscription already exists for an observable before creating a new one.\n\t\tif (this.subscription) {\n\t\t\tthis.subscription.unsubscribe();\n\t\t\tthis.subscription = null;\n\t\t}\n\n\t\tthis._value = value;\n\n\t\tif (isObservable(value)) {\n\t\t\tthis.subscription = value.subscribe(v => {\n\t\t\t\tthis.$override.next(v);\n\t\t\t});\n\t\t} else {\n\t\t\tthis.$override.next(value);\n\t\t}\n\t}\n}\n\n/**\n * An object of strings, should follow the same format as src/i18n/en.json\n */\nexport type TranslationStrings = { [key: string]: string };\n\n\n/**\n * The I18n service is a minimal internal singleton service used to supply our components with translated strings.\n *\n * All the components that support I18n also support directly passed strings.\n * Usage of I18n is optional, and it is not recommended for application use (libraries like ngx-translate\n * are a better choice)\n *\n */\n@Injectable()\nexport class I18n {\n\tprotected translationStrings = EN;\n\n\tprotected translations = new Map();\n\n\tprotected locale = new BehaviorSubject(\"en\");\n\n\t/**\n\t * Sets the locale and optionally the translation strings. Locale is used by components that\n\t * are already locale aware (datepicker for example) while the translation strings are used\n\t * for components that are not.\n\t *\n\t * Locales set here will override locales/languages set in components\n\t * @param language an ISO 639-1 language code - https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes\n\t * @param strings an object of strings, optional\n\t */\n\tpublic setLocale(language: string, strings?: TranslationStrings) {\n\t\tthis.locale.next(language);\n\t\tif (strings) {\n\t\t\tthis.set(strings);\n\t\t}\n\t}\n\n\t/**\n\t * Returns the current locale\n\t */\n\tpublic getLocale() {\n\t\treturn this.locale.value;\n\t}\n\n\t/**\n\t * Returns an observable that resolves to the current locale, and will update when changed\n\t */\n\tpublic getLocaleObservable() {\n\t\treturn this.locale.asObservable();\n\t}\n\n\t/**\n\t * Set/update the translations from an object. Also notifies all participating components of the update.\n\t *\n\t * @param strings an object of strings, should follow the same format as src/i18n/en.json\n\t */\n\tpublic set(strings: TranslationStrings) {\n\t\tthis.translationStrings = merge({}, EN, strings);\n\t\t// iterate over all our tracked translations and update each observable\n\t\tconst translations = Array.from(this.translations);\n\t\tfor (const [path, subject] of translations) {\n\t\t\tsubject.next(this.getValueFromPath(path));\n\t\t}\n\t}\n\n\t/**\n\t * When a path is specified returns an observable that will resolve to the translation string value.\n\t *\n\t * Returns the full translations object if path is not specified.\n\t *\n\t * @param path optional, looks like `\"NOTIFICATION.CLOSE_BUTTON\"`\n\t */\n\tpublic get(path?: string): any {\n\t\tif (!path) {\n\t\t\treturn this.translationStrings;\n\t\t}\n\t\treturn this.getSubject(path);\n\t}\n\n\t/**\n\t * Returns all descendents of some path fragment as an object.\n\t *\n\t * @param partialPath a path fragment, for example `\"NOTIFICATION\"`\n\t */\n\tpublic getMultiple(partialPath: string): { [key: string]: Observable<string> } {\n\t\tconst values = this.getValueFromPath(partialPath);\n\t\tconst subjects = {};\n\t\tfor (const key of Object.keys(values)) {\n\t\t\tif (values[key] === Object(values[key])) {\n\t\t\t\tsubjects[key] = this.getMultiple(`${partialPath}.${key}`);\n\t\t\t} else {\n\t\t\t\tsubjects[key] = this.getSubject(`${partialPath}.${key}`);\n\t\t\t}\n\t\t}\n\t\treturn subjects;\n\t}\n\n\t/**\n\t * Returns an instance of `Overridable` that can be used to optionally override the value provided by `I18n`\n\t * @param path looks like `\"NOTIFICATION.CLOSE_BUTTON\"`\n\t */\n\tpublic getOverridable(path: string) {\n\t\treturn new Overridable(path, this);\n\t}\n\n\t/**\n\t * Takes the `Observable` returned from `i18n.get` and an object of variables to replace.\n\t *\n\t * The keys specify the variable name in the string.\n\t *\n\t * Example:\n\t * ```\n\t * service.set({ \"TEST\": \"{{foo}} {{bar}}\" });\n\t *\n\t * service.replace(service.get(\"TEST\"), { foo: \"test\", bar: \"asdf\" })\n\t * ```\n\t *\n\t * Produces: `\"test asdf\"`\n\t *\n\t * @param subject the translation to replace variables on\n\t * @param variables object of variables to replace\n\t */\n\tpublic replace(subject: Observable<string>, variables: { [key: string]: string }) {\n\t\treturn replace(subject, variables);\n\t}\n\n\t/**\n\t * Trys to resolve a value from the provided path.\n\t *\n\t * @param path looks like `\"NOTIFICATION.CLOSE_BUTTON\"`\n\t */\n\tpublic getValueFromPath(path): string | { [key: string]: string } {\n\t\tlet value = this.translationStrings;\n\t\tfor (const segment of path.split(\".\")) {\n\t\t\tif (value[segment] !== undefined && value[segment] !== null) {\n\t\t\t\tvalue = value[segment];\n\t\t\t} else {\n\t\t\t\tthrow new Error(`no key ${segment} at ${path}`);\n\t\t\t}\n\t\t}\n\t\treturn value as any;\n\t}\n\n\t/**\n\t * Helper method that returns an observable from the internal cache based on the path\n\t *\n\t * @param path looks like `\"NOTIFICATION.CLOSE_BUTTON\"`\n\t */\n\tprotected getSubject(path: string): Observable<string> {\n\t\ttry {\n\t\t\t// we run this here to validate the path exists before adding it to the translation map\n\t\t\tconst value = this.getValueFromPath(path) as string;\n\t\t\tif (this.translations.has(path)) {\n\t\t\t\treturn this.translations.get(path);\n\t\t\t}\n\t\t\tconst translation = new BehaviorSubject(value);\n\t\t\tthis.translations.set(path, translation);\n\t\t\treturn translation;\n\t\t} catch (error) {\n\t\t\tconsole.error(error);\n\t\t}\n\t}\n}\n"]}