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import { TranslateCompiler, TranslateService } from '@ngx-translate/core';
import { once } from 'lodash-es';
import { Translations } from './translations.type';
const cache: Record<string, Function> = {};
enum PluralCases {
zero = 0,
one = 1,
two = 2,
few = 3,
many = 4,
other = 5,
}
@Injectable()
export class PWATranslateCompiler implements TranslateCompiler {
private static MAX_COMPILATION_LENGTH = 1000;
/**
* regular expression for grabbing everything in the form:
* {{<variable>, plural/select, <case>...<case>}}
*
* - beginning and ending double curly braces must always come
* together without space in between
* - cases are matched not greedy (.*?) so the regex finds the
* smallest match first (if nested, the inner first)
* - multi-line support with "/s" at the end
* - "\s*" captures (and ignores) additional whitespace
* - matching group at beginning and end to handle remaining text
*/
private static PLURAL_REGEX = /(.*)\{\{\s*(\w+)\s*,\s*(plural|select)\s*,\s*(.*?\})\s*\}\}(.*)/s;
/**
* regular expression for grabbing everything in the form:
* {{(<variable>,)? translate, <key>(, <variable-rename>)?}}
* - beginning and ending double curly braces must always come
* together without space in between
* - multi-line support with "/s" at the end
* - "\s*" captures (and ignores) additional whitespace
* - matching group at beginning and end to handle remaining text
*/
private static TRANSLATE_REGEX = /(.*)\{\{\s*(\w*)\s*,?\s*translate\s*,\s*(.*?)\s*\}\}(.*)/s;
/**
* regular expression for matching provided cases
*
* - case can be either provided with "=<value>" or "other"
* - case template is everything inside curly braces
* - "\s*" captures (and ignores) additional whitespace
* - global matching ("/g") must be active to iterate over matches
*/
private static CASE_REGEX = /(zero|one|two|few|many|other|=[\w-]+)\s*\{(.*?)\}/g;
/**
* regular expression for matching simple variables that
* have to be replaced
*/
private static SIMPLE_VARIABLE_REGEX = /\{\{\s*(\w+)\s*\}\}/g;
private translate: () => TranslateService;
constructor(injector: Injector) {
// cache TranslateService reference to avoid repeated calls to injector
this.translate = once(() => injector.get(TranslateService));
}
private checkIfCompileNeeded(value: string | Function): boolean {
return (
typeof value === 'string' &&
(PWATranslateCompiler.PLURAL_REGEX.test(value) || PWATranslateCompiler.TRANSLATE_REGEX.test(value))
);
}
private recurse(template: string, args: Record<string, unknown>) {
// if output still contains pluralization, do recursion
if (this.checkIfCompileNeeded(template)) {
return (this.compile(template) as Function)(args);
}
// replace all static variable values (if any)
return template?.replace(PWATranslateCompiler.SIMPLE_VARIABLE_REGEX, (_, repl) => args?.[repl]?.toString() ?? '');
}
private doCompile(template: string): Function {
if (PWATranslateCompiler.PLURAL_REGEX.test(template)) {
const match = PWATranslateCompiler.PLURAL_REGEX.exec(template);
const variable = match[2];
const cases = match[4];
// construct map for looking up case templates for incoming values
const casesMap: Record<string, string> = {};
let defaultCase: string;
for (let cm: RegExpExecArray; (cm = PWATranslateCompiler.CASE_REGEX.exec(cases)); ) {
const c = cm[1];
if (c.startsWith('=')) {
casesMap[c.substring(1)] = cm[2];
} else if (c === 'other') {
casesMap[`plural-${c}`] = cm[2];
defaultCase = cm[2];
} else {
casesMap[`plural-${c}`] = cm[2];
}
}
return (args: Record<string, unknown>) => {
const value = args?.[variable] ?? '';
const pluralCase = ɵgetLocalePluralCase(this.translate().currentLang)(+value);
const caseTemplate =
casesMap[value?.toString()] ?? casesMap[`plural-${PluralCases[pluralCase]}`] ?? defaultCase;
const caseOutput = caseTemplate?.replace(/#/, value?.toString());
const result = `${match[1]}${caseOutput}${match[5]}`;
return this.recurse(result, args);
};
} else if (PWATranslateCompiler.TRANSLATE_REGEX.test(template)) {
const match = PWATranslateCompiler.TRANSLATE_REGEX.exec(template);
const variable = match[2];
const key = match[3].split(',')[0].trim();
const rename = match[3].split(',')?.[1]?.trim();
return (args: Record<string, unknown>) => {
if (rename) {
args[rename] = args[variable];
}
const delegate = this.translate().instant(key, args);
const result = `${match[1]}${delegate}${match[4]}`;
return this.recurse(result, args);
};
} else E{
return (args: Record<string, unknown>) => this.recurse(template, args);
}
}
compile(template: string): string | Function {
if (this.sanityCheck(template) && this.checkIfCompileNeeded(template)) {
if (!cache[template]) {
cache[template] = this.doCompile(template);
}
return cache[template];
}
return template;
}
private sanityCheck(value: string | Function): boolean {
const sane = typeof value !== 'string' || value.length <= PWATranslateCompiler.MAX_COMPILATION_LENGTH;
Iif (isDevMode() && !sane) {
console.warn(
`Not compiling translation with value '${(value as string).substring(
0,
20
)}'... as it is too big! - Use CMS! - This is a development mode only warning and can be ignored if the behavior is intended.`
);
}
return sane;
}
compileTranslations(translations: Translations): Translations {
// be sure translate dependency is initialized on the first run
this.translate();
// This implementation is mutable by intention
// eslint-disable-next-line guard-for-in
for (const key in translations) {
translations[key] = this.compile(translations[key] as string);
}
return translations;
}
}
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