@jsverse/transloco
Version:
The internationalization (i18n) library for Angular
106 lines • 16 kB
JavaScript
import { assertInInjectionContext, computed, inject, Injector, isSignal, runInInjectionContext, } from '@angular/core';
import { toObservable, toSignal } from '@angular/core/rxjs-interop';
import { of, switchMap } from 'rxjs';
import { TRANSLOCO_SCOPE } from './transloco-scope';
import { TranslocoService } from './transloco.service';
/**
* Gets the translated value of a key as Signal
*
* @example
* text = translateSignal('hello');
* textList = translateSignal(['green', 'blue']);
* textVar = translateSignal('hello', { variable: 'world' });
* textSpanish = translateSignal('hello', { variable: 'world' }, 'es');
* textTodosScope = translateSignal('hello', { variable: 'world' }, { scope: 'todos' });
*
* @example
* dynamicKey = signal('hello');
* dynamicParam = signal({ variable: 'world' });
* text = translateSignal(this.dynamicKey, this.dynamicParam);
*
*/
export function translateSignal(key, params, lang, injector) {
if (!injector) {
assertInInjectionContext(translateSignal);
}
injector ??= inject(Injector);
const result = runInInjectionContext(injector, () => {
const service = inject(TranslocoService);
const scope = resolveScope(lang);
return computerKeysAndParams(key, params).pipe(switchMap((dynamic) => service.selectTranslate(dynamic.key, dynamic.params, scope)));
});
return toSignal(result, { initialValue: Array.isArray(key) ? [''] : '' });
}
/**
* Gets the translated object of a key as Signal
*
* @example
* object = translateObjectSignal('nested.object');
* title = object().title;
*
* @example
* dynamicKey = signal('nested.object');
* dynamicParam = signal({ variable: 'world' });
* object = translateObjectSignal(this.dynamicKey, this.dynamicParam);
*/
export function translateObjectSignal(key, params, lang, injector) {
if (!injector) {
assertInInjectionContext(translateObjectSignal);
}
injector ??= inject(Injector);
const result = runInInjectionContext(injector, () => {
const service = inject(TranslocoService);
const scope = resolveScope(lang);
return computerKeysAndParams(key, params).pipe(switchMap((dynamic) => service.selectTranslateObject(dynamic.key, dynamic.params, scope)));
});
return toSignal(result, { initialValue: Array.isArray(key) ? [] : {} });
}
function computerParams(params) {
if (isSignal(params)) {
return computed(() => params());
}
return computed(() => {
return Object.entries(params).reduce((acc, [key, value]) => {
acc[key] = isSignal(value) ? value() : value;
return acc;
}, {});
});
}
function computerKeys(keys) {
if (Array.isArray(keys)) {
return computed(() => keys.map((key) => (isSignal(key) ? key() : key)));
}
return computed(() => keys());
}
function isSignalKey(key) {
return Array.isArray(key) ? key.some(isSignal) : isSignal(key);
}
function isSignalParams(params) {
return params
? isSignal(params) || Object.values(params).some(isSignal)
: false;
}
function computerKeysAndParams(key, params) {
// Avoid async effect from toObservable for those that do not need it
if (!isSignalKey(key) && !isSignalParams(params)) {
return of({
key,
params,
});
}
const computedKeys = isSignalKey(key)
? computerKeys(key)
: computed(() => key);
const computedParams = isSignalParams(params)
? computerParams(params)
: computed(() => params);
return toObservable(computed(() => ({ key: computedKeys(), params: computedParams() })));
}
function resolveScope(scope) {
if (typeof scope === 'undefined' || scope === '') {
const translocoScope = inject(TRANSLOCO_SCOPE, { optional: true });
return translocoScope ?? undefined;
}
return scope;
}
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Signal<string[]>\n  : Signal<string>;\ntype TranslateObjectSignalRef<T> = T extends unknown[] | Signal<string[]>\n  ? Signal<Translation[]>\n  : Signal<Translation>;\n\n/**\n * Gets the translated value of a key as Signal\n *\n * @example\n * text = translateSignal('hello');\n * textList = translateSignal(['green', 'blue']);\n * textVar = translateSignal('hello', { variable: 'world' });\n * textSpanish = translateSignal('hello', { variable: 'world' }, 'es');\n * textTodosScope = translateSignal('hello', { variable: 'world' }, { scope: 'todos' });\n *\n * @example\n * dynamicKey = signal('hello');\n * dynamicParam = signal({ variable: 'world' });\n * text = translateSignal(this.dynamicKey, this.dynamicParam);\n *\n */\nexport function translateSignal<T extends TranslateSignalKey>(\n  key: T,\n  params?: TranslateSignalParams,\n  lang?: ScopeType,\n  injector?: Injector,\n): TranslateSignalRef<T> {\n  if (!injector) {\n    assertInInjectionContext(translateSignal);\n  }\n  injector ??= inject(Injector);\n  const result = runInInjectionContext(injector, () => {\n    const service = inject(TranslocoService);\n    const scope = resolveScope(lang);\n    return computerKeysAndParams(key, params).pipe(\n      switchMap((dynamic) =>\n        service.selectTranslate(dynamic.key, dynamic.params, scope),\n      ),\n    );\n  });\n  return toSignal(result, { initialValue: Array.isArray(key) ? [''] : '' });\n}\n\n/**\n * Gets the translated object of a key as Signal\n *\n * @example\n * object = translateObjectSignal('nested.object');\n * title = object().title;\n *\n * @example\n * dynamicKey = signal('nested.object');\n * dynamicParam = signal({ variable: 'world' });\n * object = translateObjectSignal(this.dynamicKey, this.dynamicParam);\n */\nexport function translateObjectSignal<T extends TranslateSignalKey>(\n  key: T,\n  params?: TranslateSignalParams,\n  lang?: ScopeType,\n  injector?: Injector,\n): TranslateObjectSignalRef<T> {\n  if (!injector) {\n    assertInInjectionContext(translateObjectSignal);\n  }\n  injector ??= inject(Injector);\n  const result = runInInjectionContext(injector, () => {\n    const service = inject(TranslocoService);\n    const scope = resolveScope(lang);\n    return computerKeysAndParams(key, params).pipe(\n      switchMap((dynamic) =>\n        service.selectTranslateObject(\n          dynamic.key,\n          dynamic.params,\n          scope as string,\n        ),\n      ),\n    );\n  });\n  return toSignal(result, { initialValue: Array.isArray(key) ? [] : {} });\n}\n\nfunction computerParams(params: HashMap<Signal<string>> | Signal<HashMap>) {\n  if (isSignal(params)) {\n    return computed(() => params());\n  }\n  return computed(() => {\n    return Object.entries(params).reduce((acc, [key, value]) => {\n      acc[key] = isSignal(value) ? value() : value;\n      return acc;\n    }, {} as HashMap);\n  });\n}\n\nfunction computerKeys(\n  keys: Signal<string> | Signal<string[]> | Signal<string>[],\n) {\n  if (Array.isArray(keys)) {\n    return computed(() => keys.map((key) => (isSignal(key) ? key() : key)));\n  }\n  return computed(() => keys());\n}\n\nfunction isSignalKey(key: TranslateSignalKey): key is SignalKey {\n  return Array.isArray(key) ? key.some(isSignal) : isSignal(key);\n}\n\nfunction isSignalParams(\n  params?: HashMap,\n): params is HashMap<Signal<string>> | Signal<HashMap> {\n  return params\n    ? isSignal(params) || Object.values(params).some(isSignal)\n    : false;\n}\n\nfunction computerKeysAndParams(\n  key: TranslateSignalKey,\n  params?: TranslateSignalParams,\n): Observable<{\n  key: string | string[];\n  params: HashMap | undefined;\n}> {\n  // Avoid async effect from toObservable for those that do not need it\n  if (!isSignalKey(key) && !isSignalParams(params)) {\n    return of({\n      key,\n      params,\n    });\n  }\n  const computedKeys = isSignalKey(key)\n    ? computerKeys(key)\n    : computed(() => key);\n  const computedParams = isSignalParams(params)\n    ? computerParams(params)\n    : computed(() => params);\n  return toObservable(\n    computed(() => ({ key: computedKeys(), params: computedParams() })),\n  );\n}\n\nfunction resolveScope(scope?: ScopeType) {\n  if (typeof scope === 'undefined' || scope === '') {\n    const translocoScope = inject(TRANSLOCO_SCOPE, { optional: true });\n    return translocoScope ?? undefined;\n  }\n  return scope;\n}\n"]}