@jsverse/transloco
Version:
The internationalization (i18n) library for Angular
97 lines • 14 kB
JavaScript
import { ChangeDetectorRef, Inject, Optional, Pipe, } from '@angular/core';
import { switchMap, forkJoin } from 'rxjs';
import { TranslocoService } from './transloco.service';
import { TRANSLOCO_SCOPE } from './transloco-scope';
import { TRANSLOCO_LANG } from './transloco-lang';
import { listenOrNotOperator, resolveInlineLoader, shouldListenToLangChanges, } from './shared';
import { LangResolver } from './lang-resolver';
import { ScopeResolver } from './scope-resolver';
import * as i0 from "@angular/core";
import * as i1 from "./transloco.service";
export class TranslocoPipe {
service;
providerScope;
providerLang;
cdr;
subscription = null;
lastValue = '';
lastKey;
path;
langResolver = new LangResolver();
scopeResolver;
constructor(service, providerScope, providerLang, cdr) {
this.service = service;
this.providerScope = providerScope;
this.providerLang = providerLang;
this.cdr = cdr;
this.scopeResolver = new ScopeResolver(this.service);
}
// null is for handling strict mode + async pipe types https://github.com/jsverse/transloco/issues/311
// null is for handling strict mode + optional chaining types https://github.com/jsverse/transloco/issues/488
transform(key, params, inlineLang) {
if (!key) {
return key;
}
const keyName = params ? `${key}${JSON.stringify(params)}` : key;
if (keyName === this.lastKey) {
return this.lastValue;
}
this.lastKey = keyName;
this.subscription?.unsubscribe();
const listenToLangChange = shouldListenToLangChanges(this.service, this.providerLang || inlineLang);
this.subscription = this.service.langChanges$
.pipe(switchMap((activeLang) => {
const lang = this.langResolver.resolve({
inline: inlineLang,
provider: this.providerLang,
active: activeLang,
});
return Array.isArray(this.providerScope)
? forkJoin(this.providerScope.map((providerScope) => this.resolveScope(lang, providerScope)))
: this.resolveScope(lang, this.providerScope);
}), listenOrNotOperator(listenToLangChange))
.subscribe(() => this.updateValue(key, params));
return this.lastValue;
}
ngOnDestroy() {
this.subscription?.unsubscribe();
// Caretaker note: it's important to clean up references to subscriptions since they save the `next`
// callback within its `destination` property, preventing classes from being GC'd.
this.subscription = null;
}
updateValue(key, params) {
const lang = this.langResolver.resolveLangBasedOnScope(this.path);
this.lastValue = this.service.translate(key, params, lang);
this.cdr.markForCheck();
}
resolveScope(lang, providerScope) {
const resolvedScope = this.scopeResolver.resolve({
inline: undefined,
provider: providerScope,
});
this.path = this.langResolver.resolveLangPath(lang, resolvedScope);
const inlineLoader = resolveInlineLoader(providerScope, resolvedScope);
return this.service._loadDependencies(this.path, inlineLoader);
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.0.4", ngImport: i0, type: TranslocoPipe, deps: [{ token: i1.TranslocoService }, { token: TRANSLOCO_SCOPE, optional: true }, { token: TRANSLOCO_LANG, optional: true }, { token: i0.ChangeDetectorRef }], target: i0.ɵɵFactoryTarget.Pipe });
static ɵpipe = i0.ɵɵngDeclarePipe({ minVersion: "14.0.0", version: "18.0.4", ngImport: i0, type: TranslocoPipe, isStandalone: true, name: "transloco", pure: false });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.0.4", ngImport: i0, type: TranslocoPipe, decorators: [{
type: Pipe,
args: [{
name: 'transloco',
pure: false,
standalone: true,
}]
}], ctorParameters: () => [{ type: i1.TranslocoService }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [TRANSLOCO_SCOPE]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [TRANSLOCO_LANG]
}] }, { type: i0.ChangeDetectorRef }] });
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`${key}${JSON.stringify(params)}` : key;\n\n    if (keyName === this.lastKey) {\n      return this.lastValue;\n    }\n\n    this.lastKey = keyName;\n    this.subscription?.unsubscribe();\n\n    const listenToLangChange = shouldListenToLangChanges(\n      this.service,\n      this.providerLang || inlineLang,\n    );\n\n    this.subscription = this.service.langChanges$\n      .pipe(\n        switchMap((activeLang) => {\n          const lang = this.langResolver.resolve({\n            inline: inlineLang,\n            provider: this.providerLang,\n            active: activeLang,\n          });\n\n          return Array.isArray(this.providerScope)\n            ? forkJoin(\n                this.providerScope.map((providerScope) =>\n                  this.resolveScope(lang, providerScope),\n                ),\n              )\n            : this.resolveScope(lang, this.providerScope);\n        }),\n        listenOrNotOperator(listenToLangChange),\n      )\n      .subscribe(() => this.updateValue(key, params));\n\n    return this.lastValue;\n  }\n\n  ngOnDestroy() {\n    this.subscription?.unsubscribe();\n    // Caretaker note: it's important to clean up references to subscriptions since they save the `next`\n    // callback within its `destination` property, preventing classes from being GC'd.\n    this.subscription = null;\n  }\n\n  private updateValue(key: string, params?: HashMap | undefined) {\n    const lang = this.langResolver.resolveLangBasedOnScope(this.path!);\n    this.lastValue = this.service.translate(key, params, lang);\n    this.cdr.markForCheck();\n  }\n\n  private resolveScope(\n    lang: string,\n    providerScope: TranslocoScope | null,\n  ): Observable<Translation | Translation[]> {\n    const resolvedScope = this.scopeResolver.resolve({\n      inline: undefined,\n      provider: providerScope,\n    });\n    this.path = this.langResolver.resolveLangPath(lang, resolvedScope);\n    const inlineLoader = resolveInlineLoader(providerScope, resolvedScope);\n\n    return this.service._loadDependencies(this.path, inlineLoader);\n  }\n}\n"]}