90 lines
2.7 KiB
TypeScript
90 lines
2.7 KiB
TypeScript
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/**
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* @license
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* Copyright Google LLC All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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const EXTRACT_GENERATED_TRANSLATIONS_REGEXP =
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/const\s*(.*?)\s*=\s*goog\.getMsg\("(.*?)",?\s*(.*?)\)/g;
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/**
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* Verify that placeholders in translation strings match placeholders in the object defined in the
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* `goog.getMsg()` function arguments.
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*/
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export function verifyPlaceholdersIntegrity(output: string): boolean {
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const translations = extractTranslations(output);
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translations.forEach(([msg, args]) => {
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const bodyPhs = extractPlaceholdersFromMsg(msg);
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const argsPhs = extractPlaceholdersFromArgs(args);
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if (bodyPhs.size !== argsPhs.size || diff(bodyPhs, argsPhs).size) {
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return false;
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}
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});
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return true;
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}
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/**
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* Verify that all the variables initialized with `goog.getMsg()` calls have
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* unique names.
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*/
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export function verifyUniqueConsts(output: string): boolean {
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extract(
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output, EXTRACT_GENERATED_TRANSLATIONS_REGEXP,
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(current: string[], state: Set<string>): string => {
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const key = current[1];
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if (state.has(key)) {
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throw new Error(`Duplicate const ${key} found in generated output!`);
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}
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return key;
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});
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return true;
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}
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/**
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* Extract pairs of `[msg, placeholders]`, in calls to `goog.getMsg()`, from the `source`.
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*
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* @param source The source code to parse.
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*/
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function extractTranslations(source: string): Set<string[]> {
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return extract(
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source, EXTRACT_GENERATED_TRANSLATIONS_REGEXP,
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([, , msg, placeholders]) => [msg, placeholders]);
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}
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/**
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* Extract placeholder names (of the form `{$PLACEHOLDER}`) from the `msg`.
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*
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* @param msg The text of the message to parse.
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*/
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function extractPlaceholdersFromMsg(msg: string): Set<string> {
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const regex = /{\$(.*?)}/g;
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return extract(msg, regex, ([, placeholders]) => placeholders);
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}
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/**
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* Extract the placeholder names (of the form `"PLACEHOLDER": "XXX"`) from the body of the argument
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* provided as `args`.
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*
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* @param args The body of an object literal containing placeholder info.
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*/
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function extractPlaceholdersFromArgs(args: string): Set<string> {
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const regex = /\s+"(.+?)":\s*".*?"/g;
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return extract(args, regex, ([, placeholders]) => placeholders);
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}
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function extract<T>(
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from: string, regex: RegExp, transformFn: (match: string[], state: Set<T>) => T): Set<T> {
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const result = new Set<T>();
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let item;
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while ((item = regex.exec(from)) !== null) {
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result.add(transformFn(item, result));
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}
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return result;
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}
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function diff(a: Set<string>, b: Set<string>): Set<string> {
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return new Set(Array.from(a).filter(x => !b.has(x)));
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}
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