"isJapanese" check move (#730)

* Move isStringPartiallyJapanese out of ClipboardMonitor

* Create isStringPartiallyJapanese function

* Add textMayBeTranslatable

* Rename API function

* Rename internal function

* Add helper

* Update translatable check

* Pass language to TextScanner

* Pass language explicitly

* Use textMayBeTranslatable

* No redundant translatable check

* Update eslint

* Remove double newline

* Collapse

* Rename

1 files changed, 29 insertions, 0 deletions

diff --git a/ext/js/language/text-utilities.js b/ext/js/language/text-utilities.js
new file mode 100644
index 00000000..ca8958aa
--- /dev/null
+++ b/ext/js/language/text-utilities.js
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2024  Yomitan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {isStringPartiallyJapanese} from './ja/japanese.js';
+
+/**
+ * Returns the language that the string might be by using some heuristic checks.
+ * Values returned are ISO codes. `null` is returned if no language can be determined.
+ * @param {string} text
+ * @returns {?string}
+ */
+export function getLanguageFromText(text) {
+    if (isStringPartiallyJapanese(text)) { return 'ja'; }
+    return null;
+}