@jsverse/transloco
Version:
The internationalization (i18n) library for Angular
150 lines • 19.1 kB
JavaScript
import { inject, Injectable, InjectionToken, Injector } from '@angular/core';
import { isDefined, isObject, isString } from '@jsverse/utils';
import { defaultConfig, TRANSLOCO_CONFIG, } from './transloco.config';
import { getValue, setValue } from './utils/object.utils';
import * as i0 from "@angular/core";
export const TRANSLOCO_TRANSPILER =
/* @__PURE__ */ new InjectionToken(ngDevMode ? 'TRANSLOCO_TRANSPILER' : '');
export class DefaultTranspiler {
config = inject(TRANSLOCO_CONFIG, { optional: true }) ?? defaultConfig;
get interpolationMatcher() {
return resolveMatcher(this.config);
}
transpile({ value, params = {}, translation, key }) {
if (isString(value)) {
let paramMatch;
let parsedValue = value;
while ((paramMatch = this.interpolationMatcher.exec(parsedValue)) !== null) {
const [match, paramValue] = paramMatch;
parsedValue = parsedValue.replace(match, () => {
const match = paramValue.trim();
const param = getValue(params, match);
if (isDefined(param)) {
return param;
}
return isDefined(translation[match])
? this.transpile({
params,
translation,
key,
value: translation[match],
})
: '';
});
}
return parsedValue;
}
else if (params) {
if (isObject(value)) {
value = this.handleObject({
value,
params,
translation,
key,
});
}
else if (Array.isArray(value)) {
value = this.handleArray({ value, params, translation, key });
}
}
return value;
}
/**
*
* @example
*
* const en = {
* a: {
* b: {
* c: "Hello {{ value }}"
* }
* }
* }
*
* const params = {
* "b.c": { value: "Transloco "}
* }
*
* service.selectTranslate('a', params);
*
* // the first param will be the result of `en.a`.
* // the second param will be `params`.
* parser.transpile(value, params, {});
*
*
*/
handleObject({ value, params = {}, translation, key, }) {
let result = value;
Object.keys(params).forEach((p) => {
// transpile the value => "Hello Transloco"
const transpiled = this.transpile({
// get the value of "b.c" inside "a" => "Hello {{ value }}"
value: getValue(result, p),
// get the params of "b.c" => { value: "Transloco" }
params: getValue(params, p),
translation,
key,
});
// set "b.c" to `transpiled`
result = setValue(result, p, transpiled);
});
return result;
}
handleArray({ value, ...rest }) {
return value.map((v) => this.transpile({
value: v,
...rest,
}));
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.9", ngImport: i0, type: DefaultTranspiler, deps: [], target: i0.ɵɵFactoryTarget.Injectable });
static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.9", ngImport: i0, type: DefaultTranspiler });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.9", ngImport: i0, type: DefaultTranspiler, decorators: [{
type: Injectable
}] });
function resolveMatcher(config) {
const [start, end] = config.interpolation;
return new RegExp(`${start}([^${start}${end}]*?)${end}`, 'g');
}
export function getFunctionArgs(argsString) {
const splitted = argsString ? argsString.split(',') : [];
const args = [];
for (let i = 0; i < splitted.length; i++) {
let value = splitted[i].trim();
while (value[value.length - 1] === '\\') {
i++;
value = value.replace('\\', ',') + splitted[i];
}
args.push(value);
}
return args;
}
export class FunctionalTranspiler extends DefaultTranspiler {
injector = inject(Injector);
transpile({ value, ...rest }) {
let transpiled = value;
if (isString(value)) {
transpiled = value.replace(/\[\[\s*(\w+)\((.*?)\)\s*]]/g, (match, functionName, args) => {
try {
const func = this.injector.get(functionName);
return func.transpile(...getFunctionArgs(args));
}
catch (e) {
let message = `There is an error in: '${value}'.
Check that the you used the right syntax in your translation and that the implementation of ${functionName} is correct.`;
if (e.message.includes('NullInjectorError')) {
message = `You are using the '${functionName}' function in your translation but no provider was found!`;
}
throw new Error(message);
}
});
}
return super.transpile({ value: transpiled, ...rest });
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.9", ngImport: i0, type: FunctionalTranspiler, deps: null, target: i0.ɵɵFactoryTarget.Injectable });
static ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.9", ngImport: i0, type: FunctionalTranspiler });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.9", ngImport: i0, type: FunctionalTranspiler, decorators: [{
type: Injectable
}] });
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'TRANSLOCO_TRANSPILER' : '',\n  );\n\nexport interface TranslocoTranspiler {\n  transpile(params: TranspileParams): any;\n\n  onLangChanged?(lang: string): void;\n}\n\nexport interface TranspileParams<V = unknown> {\n  value: V;\n  params?: HashMap;\n  translation: Translation;\n  key: string;\n}\n\n@Injectable()\nexport class DefaultTranspiler implements TranslocoTranspiler {\n  protected config =\n    inject(TRANSLOCO_CONFIG, { optional: true }) ?? defaultConfig;\n\n  protected get interpolationMatcher() {\n    return resolveMatcher(this.config);\n  }\n\n  transpile({ value, params = {}, translation, key }: TranspileParams): any {\n    if (isString(value)) {\n      let paramMatch: RegExpExecArray | null;\n      let parsedValue = value;\n\n      while (\n        (paramMatch = this.interpolationMatcher.exec(parsedValue)) !== null\n      ) {\n        const [match, paramValue] = paramMatch;\n        parsedValue = parsedValue.replace(match, () => {\n          const match = paramValue.trim();\n\n          const param = getValue(params, match);\n          if (isDefined(param)) {\n            return param;\n          }\n\n          return isDefined(translation[match])\n            ? this.transpile({\n                params,\n                translation,\n                key,\n                value: translation[match],\n              })\n            : '';\n        });\n      }\n\n      return parsedValue;\n    } else if (params) {\n      if (isObject(value)) {\n        value = this.handleObject({\n          value,\n          params,\n          translation,\n          key,\n        });\n      } else if (Array.isArray(value)) {\n        value = this.handleArray({ value, params, translation, key });\n      }\n    }\n\n    return value;\n  }\n\n  /**\n   *\n   * @example\n   *\n   * const en = {\n   *  a: {\n   *    b: {\n   *      c: \"Hello {{ value }}\"\n   *    }\n   *  }\n   * }\n   *\n   * const params =  {\n   *  \"b.c\": { value: \"Transloco \"}\n   * }\n   *\n   * service.selectTranslate('a', params);\n   *\n   * // the first param will be the result of `en.a`.\n   * // the second param will be `params`.\n   * parser.transpile(value, params, {});\n   *\n   *\n   */\n  protected handleObject({\n    value,\n    params = {},\n    translation,\n    key,\n  }: TranspileParams<Record<any, any>>) {\n    let result = value;\n\n    Object.keys(params).forEach((p) => {\n      // transpile the value => \"Hello Transloco\"\n      const transpiled = this.transpile({\n        // get the value of \"b.c\" inside \"a\" => \"Hello {{ value }}\"\n        value: getValue(result, p),\n        // get the params of \"b.c\" => { value: \"Transloco\" }\n        params: getValue(params, p),\n        translation,\n        key,\n      });\n\n      // set \"b.c\" to `transpiled`\n      result = setValue(result, p, transpiled);\n    });\n\n    return result;\n  }\n\n  protected handleArray({ value, ...rest }: TranspileParams<unknown[]>) {\n    return value.map((v) =>\n      this.transpile({\n        value: v,\n        ...rest,\n      }),\n    );\n  }\n}\n\nfunction resolveMatcher(config: TranslocoConfig): RegExp {\n  const [start, end] = config.interpolation;\n\n  return new RegExp(`${start}([^${start}${end}]*?)${end}`, 'g');\n}\n\nexport interface TranslocoTranspilerFunction {\n  transpile(...args: string[]): any;\n}\n\nexport function getFunctionArgs(argsString: string): string[] {\n  const splitted = argsString ? argsString.split(',') : [];\n  const args = [];\n  for (let i = 0; i < splitted.length; i++) {\n    let value = splitted[i].trim();\n    while (value[value.length - 1] === '\\\\') {\n      i++;\n      value = value.replace('\\\\', ',') + splitted[i];\n    }\n    args.push(value);\n  }\n\n  return args;\n}\n\n@Injectable()\nexport class FunctionalTranspiler\n  extends DefaultTranspiler\n  implements TranslocoTranspiler\n{\n  protected injector = inject(Injector);\n\n  transpile({ value, ...rest }: TranspileParams) {\n    let transpiled = value;\n    if (isString(value)) {\n      transpiled = value.replace(\n        /\\[\\[\\s*(\\w+)\\((.*?)\\)\\s*]]/g,\n        (match: string, functionName: string, args: string) => {\n          try {\n            const func: TranslocoTranspilerFunction =\n              this.injector.get(functionName);\n\n            return func.transpile(...getFunctionArgs(args));\n          } catch (e: unknown) {\n            let message = `There is an error in: '${value}'. \n                          Check that the you used the right syntax in your translation and that the implementation of ${functionName} is correct.`;\n            if ((e as Error).message.includes('NullInjectorError')) {\n              message = `You are using the '${functionName}' function in your translation but no provider was found!`;\n            }\n            throw new Error(message);\n          }\n        },\n      );\n    }\n\n    return super.transpile({ value: transpiled, ...rest });\n  }\n}\n"]}