Add isTextLookupWorthy function for Chinese (#743)

* add is Chinese check move

* fix lint

* fix lint

* fixes

---------

Co-authored-by: Darius Jahandarie <djahandarie@gmail.com>
Co-authored-by: Stefan Vukovic <stefanvukovic44@gmail.com>

4 files changed, 168 insertions, 61 deletions

diff --git a/ext/js/language/CJK-util.js b/ext/js/language/CJK-util.js
new file mode 100644
index 00000000..5c59afb5
--- /dev/null
+++ b/ext/js/language/CJK-util.js
@@ -0,0 +1,96 @@
+/*
+ * 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/>.
+ */
+
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_RANGE = [0x4e00, 0x9fff];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A_RANGE = [0x3400, 0x4dbf];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B_RANGE = [0x20000, 0x2a6df];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C_RANGE = [0x2a700, 0x2b73f];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D_RANGE = [0x2b740, 0x2b81f];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_E_RANGE = [0x2b820, 0x2ceaf];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_F_RANGE = [0x2ceb0, 0x2ebef];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_G_RANGE = [0x30000, 0x3134f];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_H_RANGE = [0x31350, 0x323af];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_I_RANGE = [0x2ebf0, 0x2ee5f];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_COMPATIBILITY_IDEOGRAPHS_RANGE = [0xf900, 0xfaff];
+/** @type {import('CJK-util').CodepointRange} */
+const CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT_RANGE = [0x2f800, 0x2fa1f];
+
+/** @type {import('CJK-util').CodepointRange[]} */
+export const CJK_IDEOGRAPH_RANGES = [
+    CJK_UNIFIED_IDEOGRAPHS_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_E_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_F_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_G_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_H_RANGE,
+    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_I_RANGE,
+    CJK_COMPATIBILITY_IDEOGRAPHS_RANGE,
+    CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT_RANGE,
+];
+
+/** @type {import('CJK-util').CodepointRange[]} */
+export const FULLWIDTH_CHARACTER_RANGES = [
+    [0xff10, 0xff19], // Fullwidth numbers
+    [0xff21, 0xff3a], // Fullwidth upper case Latin letters
+    [0xff41, 0xff5a], // Fullwidth lower case Latin letters
+
+    [0xff01, 0xff0f], // Fullwidth punctuation 1
+    [0xff1a, 0xff1f], // Fullwidth punctuation 2
+    [0xff3b, 0xff3f], // Fullwidth punctuation 3
+    [0xff5b, 0xff60], // Fullwidth punctuation 4
+    [0xffe0, 0xffee], // Currency markers
+];
+
+/** @type {import('CJK-util').CodepointRange} */
+export const CJK_PUNCTUATION_RANGE = [0x3000, 0x303f];
+
+/**
+ * @param {number} codePoint
+ * @param {import('CJK-util').CodepointRange} range
+ * @returns {boolean}
+ */
+export function isCodePointInRange(codePoint, [min, max]) {
+    return (codePoint >= min && codePoint <= max);
+}
+
+/**
+ * @param {number} codePoint
+ * @param {import('CJK-util').CodepointRange[]} ranges
+ * @returns {boolean}
+ */
+export function isCodePointInRanges(codePoint, ranges) {
+    for (const [min, max] of ranges) {
+        if (codePoint >= min && codePoint <= max) {
+            return true;
+        }
+    }
+    return false;
+}
diff --git a/ext/js/language/ja/japanese.js b/ext/js/language/ja/japanese.js
index bad773b3..3a009ebb 100644
--- a/ext/js/language/ja/japanese.js
+++ b/ext/js/language/ja/japanese.js
@@ -15,6 +15,8 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+import {CJK_IDEOGRAPH_RANGES, isCodePointInRange, isCodePointInRanges} from '../CJK-util.js';
+
 
 const HIRAGANA_SMALL_TSU_CODE_POINT = 0x3063;
 const KATAKANA_SMALL_TSU_CODE_POINT = 0x30c3;
@@ -22,53 +24,22 @@ const KATAKANA_SMALL_KA_CODE_POINT = 0x30f5;
 const KATAKANA_SMALL_KE_CODE_POINT = 0x30f6;
 const KANA_PROLONGED_SOUND_MARK_CODE_POINT = 0x30fc;
 
-/** @type {import('japanese-util').CodepointRange} */
+/** @type {import('CJK-util').CodepointRange} */
 const HIRAGANA_RANGE = [0x3040, 0x309f];
-/** @type {import('japanese-util').CodepointRange} */
+/** @type {import('CJK-util').CodepointRange} */
 const KATAKANA_RANGE = [0x30a0, 0x30ff];
 
-/** @type {import('japanese-util').CodepointRange} */
+/** @type {import('CJK-util').CodepointRange} */
 const HIRAGANA_CONVERSION_RANGE = [0x3041, 0x3096];
-/** @type {import('japanese-util').CodepointRange} */
+/** @type {import('CJK-util').CodepointRange} */
 const KATAKANA_CONVERSION_RANGE = [0x30a1, 0x30f6];
 
-/** @type {import('japanese-util').CodepointRange[]} */
+/** @type {import('CJK-util').CodepointRange[]} */
 const KANA_RANGES = [HIRAGANA_RANGE, KATAKANA_RANGE];
 
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_UNIFIED_IDEOGRAPHS_RANGE = [0x4e00, 0x9fff];
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A_RANGE = [0x3400, 0x4dbf];
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B_RANGE = [0x20000, 0x2a6df];
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C_RANGE = [0x2a700, 0x2b73f];
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D_RANGE = [0x2b740, 0x2b81f];
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_E_RANGE = [0x2b820, 0x2ceaf];
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_UNIFIED_IDEOGRAPHS_EXTENSION_F_RANGE = [0x2ceb0, 0x2ebef];
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_COMPATIBILITY_IDEOGRAPHS_RANGE = [0xf900, 0xfaff];
-/** @type {import('japanese-util').CodepointRange} */
-const CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT_RANGE = [0x2f800, 0x2fa1f];
-/** @type {import('japanese-util').CodepointRange[]} */
-const CJK_IDEOGRAPH_RANGES = [
-    CJK_UNIFIED_IDEOGRAPHS_RANGE,
-    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A_RANGE,
-    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_B_RANGE,
-    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_C_RANGE,
-    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_D_RANGE,
-    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_E_RANGE,
-    CJK_UNIFIED_IDEOGRAPHS_EXTENSION_F_RANGE,
-    CJK_COMPATIBILITY_IDEOGRAPHS_RANGE,
-    CJK_COMPATIBILITY_IDEOGRAPHS_SUPPLEMENT_RANGE,
-];
-
 /**
  * Japanese character ranges, roughly ordered in order of expected frequency.
- * @type {import('japanese-util').CodepointRange[]}
+ * @type {import('CJK-util').CodepointRange[]}
  */
 const JAPANESE_RANGES = [
     HIRAGANA_RANGE,
@@ -184,30 +155,6 @@ for (let i = 0, ii = kana.length; i < ii; i += 3) {
     }
 }
 
-
-/**
- * @param {number} codePoint
- * @param {import('japanese-util').CodepointRange} range
- * @returns {boolean}
- */
-function isCodePointInRange(codePoint, [min, max]) {
-    return (codePoint >= min && codePoint <= max);
-}
-
-/**
- * @param {number} codePoint
- * @param {import('japanese-util').CodepointRange[]} ranges
- * @returns {boolean}
- */
-function isCodePointInRanges(codePoint, ranges) {
-    for (const [min, max] of ranges) {
-        if (codePoint >= min && codePoint <= max) {
-            return true;
-        }
-    }
-    return false;
-}
-
 /**
  * @param {string} previousCharacter
  * @returns {?string}
diff --git a/ext/js/language/language-descriptors.js b/ext/js/language/language-descriptors.js
index 07ca31ac..defd73a8 100644
--- a/ext/js/language/language-descriptors.js
+++ b/ext/js/language/language-descriptors.js
@@ -36,6 +36,7 @@ import {removeRussianDiacritics, yoToE} from './ru/russian-text-preprocessors.js
 import {oldIrishTransforms} from './sga/old-irish-transforms.js';
 import {albanianTransforms} from './sq/albanian-transforms.js';
 import {capitalizeFirstLetter, decapitalize, removeAlphabeticDiacritics} from './text-processors.js';
+import {isStringPartiallyChinese} from './zh/chinese.js';
 
 const capitalizationPreprocessors = {
     decapitalize,
@@ -264,6 +265,7 @@ const languageDescriptors = [
         iso: 'zh',
         name: 'Chinese',
         exampleText: '读',
+        isTextLookupWorthy: isStringPartiallyChinese,
     },
 ];
 
diff --git a/ext/js/language/zh/chinese.js b/ext/js/language/zh/chinese.js
new file mode 100644
index 00000000..086d2f0a
--- /dev/null
+++ b/ext/js/language/zh/chinese.js
@@ -0,0 +1,62 @@
+/*
+ * 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 {CJK_IDEOGRAPH_RANGES, CJK_PUNCTUATION_RANGE, FULLWIDTH_CHARACTER_RANGES, isCodePointInRanges} from '../CJK-util.js';
+
+/** @type {import('CJK-util').CodepointRange} */
+const BOPOMOFO_RANGE = [0x3100, 0x312f];
+/** @type {import('CJK-util').CodepointRange} */
+const BOPOMOFO_EXTENDED_RANGE = [0x31a0, 0x31bf];
+/** @type {import('CJK-util').CodepointRange} */
+const IDEOGRAPHIC_SYMBOLS_AND_PUNCTUATION_RANGE = [0x16fe0, 0x16fff];
+/** @type {import('CJK-util').CodepointRange} */
+const SMALL_FORM_RANGE = [0xfe50, 0xfe6f];
+/** @type {import('CJK-util').CodepointRange} */
+const VERTICAL_FORM_RANGE = [0xfe10, 0xfe1f];
+
+
+/**
+ * Chinese character ranges, roughly ordered in order of expected frequency.
+ * @type {import('CJK-util').CodepointRange[]}
+ */
+const CHINESE_RANGES = [
+    ...CJK_IDEOGRAPH_RANGES,
+    CJK_PUNCTUATION_RANGE,
+
+    ...FULLWIDTH_CHARACTER_RANGES,
+
+    BOPOMOFO_RANGE,
+    BOPOMOFO_EXTENDED_RANGE,
+    IDEOGRAPHIC_SYMBOLS_AND_PUNCTUATION_RANGE,
+    SMALL_FORM_RANGE,
+    VERTICAL_FORM_RANGE,
+];
+
+
+/**
+ * @param {string} str
+ * @returns {boolean}
+ */
+export function isStringPartiallyChinese(str) {
+    if (str.length === 0) { return false; }
+    for (const c of str) {
+        if (isCodePointInRanges(/** @type {number} */ (c.codePointAt(0)), CHINESE_RANGES)) {
+            return true;
+        }
+    }
+    return false;
+}