ci: verify locale data

.github/workflows/locale.yml

@@ -0,0 +1,27 @@
+name: Lint
+
+on:
+  push:
+    paths:
+      - locales/**
+  pull_request:
+    paths:
+      - locales/**
+
+jobs:
+  locale_verify:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    steps:
+    - uses: actions/checkout@v4.1.1
+      with:
+        fetch-depth: 0
+        submodules: true
+    - uses: pnpm/action-setup@v4
+    - uses: actions/setup-node@v4.0.2
+      with:
+        node-version-file: '.node-version'
+        cache: 'pnpm'
+    - run: corepack enable
+    - run: pnpm i --frozen-lockfile
+    - run: cd locales && node verify.js

locales/verify.js

@@ -0,0 +1,53 @@
+import locales from './index.js';
+
+let valid = true;
+
+function writeError(type, lang, tree, data) {
+	process.stderr.write(JSON.stringify({ type, lang, tree, data }));
+	process.stderr.write('\n');
+	valid = false;
+}
+
+function verify(expected, actual, lang, trace) {
+	for (let key in expected) {
+		if (!Object.prototype.hasOwnProperty.call(actual, key)) {
+			continue;
+		}
+		if (typeof expected[key] === 'object') {
+			if (typeof actual[key] !== 'object') {
+				writeError('mismatched_type', lang, trace ? `${trace}.${key}` : key, { expected: 'object', actual: typeof actual[key] });
+				continue;
+			}
+			verify(expected[key], actual[key], lang, trace ? `${trace}.${key}` : key);
+		} else if (typeof expected[key] === 'string') {
+			switch (typeof actual[key]) {
+				case 'object':
+					writeError('mismatched_type', lang, trace ? `${trace}.${key}` : key, { expected: 'string', actual: 'object' });
+					break;
+				case 'undefined':
+					continue;
+				case 'string':
+					const expectedParameters = new Set(expected[key].match(/\{[^}]+\}/g)?.map((s) => s.slice(1, -1)));
+					const actualParameters = new Set(actual[key].match(/\{[^}]+\}/g)?.map((s) => s.slice(1, -1)));
+					for (let parameter of expectedParameters) {
+						if (!actualParameters.has(parameter)) {
+							writeError('missing_parameter', lang, trace ? `${trace}.${key}` : key, { parameter });
+						}
+					}
+			}
+		}
+	}
+}
+
+const { ['ja-JP']: original, ...verifiees } = locales;
+
+for (let lang in verifiees) {
+	if (!Object.prototype.hasOwnProperty.call(locales, lang)) {
+		continue;
+	}
+	verify(original, verifiees[lang], lang);
+}
+
+if (!valid) {
+	process.exit(1);
+}