[feat] add system language support across desktop and mobile

2026-11-04 04:52:39 +08:00 · 2026-10-27 12:35:47 +08:00
parent b4acf0b597
commit b07f457e76
105 changed files with 21711 additions and 1627 deletions
@@ -0,0 +1,111 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-10-27
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _SYSTEM_LANGUAGE_H_
+#define _SYSTEM_LANGUAGE_H_
+
+#include <algorithm>
+#include <cstdlib>
+#include <string>
+#include <vector>
+
+#if defined(_WIN32)
+#include <Windows.h>
+#elif defined(__APPLE__)
+#include <CoreFoundation/CoreFoundation.h>
+#endif
+
+namespace crossdesk {
+namespace localization {
+
+inline constexpr int kSystemLanguage = 10;
+inline constexpr int kEnglishLanguage = 1;
+
+// Keep 0/1/2 compatible with existing Chinese/English/Russian config files.
+inline int MatchLanguage(std::string tag) {
+  for (char& c : tag) {
+    if (c == '_') c = '-';
+    else if (c >= 'A' && c <= 'Z') c += 'a' - 'A';
+  }
+  tag = tag.substr(0, tag.find_first_of(".@"));
+  const auto base = tag.substr(0, tag.find('-'));
+  if (base == "zh") {
+    const auto parts = "-" + tag + "-";
+    if (parts.find("-hans-") != std::string::npos) return 0;
+    return parts.find("-hant-") != std::string::npos ||
+                   parts.find("-tw-") != std::string::npos ||
+                   parts.find("-hk-") != std::string::npos ||
+                   parts.find("-mo-") != std::string::npos ? 3 : 0;
+  }
+  const char* codes[] = {"zh", "en", "ru", "zh", "ja", "ko", "de", "fr", "es", "pt"};
+  for (int i = 1; i < kSystemLanguage; ++i)
+    if (i != 3 && base == codes[i]) return i;
+  if (base == "c" || base == "posix") return kEnglishLanguage;
+  return -1;
+}
+
+inline int MatchPreferredLanguages(const std::vector<std::string>& tags) {
+  for (const auto& tag : tags) {
+    const int match = MatchLanguage(tag);
+    if (match >= 0) return match;
+  }
+  return kEnglishLanguage;
+}
+
+inline int DetectSystemLanguage() {
+  std::vector<std::string> tags;
+#if defined(_WIN32)
+  ULONG count = 0, length = 0;
+  GetUserPreferredUILanguages(MUI_LANGUAGE_NAME, &count, nullptr, &length);
+  std::vector<wchar_t> names(length);
+  if (length && GetUserPreferredUILanguages(MUI_LANGUAGE_NAME, &count, names.data(), &length)) {
+    for (const wchar_t* name = names.data(); *name; name += wcslen(name) + 1) {
+      std::string tag;
+      for (const wchar_t* c = name; *c; ++c) tag += static_cast<char>(*c);
+      tags.push_back(tag);
+    }
+  }
+#elif defined(__APPLE__)
+  if (CFArrayRef names = CFLocaleCopyPreferredLanguages()) {
+    for (CFIndex i = 0; i < CFArrayGetCount(names); ++i) {
+      char tag[128] = {};
+      auto name = static_cast<CFStringRef>(CFArrayGetValueAtIndex(names, i));
+      if (CFStringGetCString(name, tag, sizeof(tag), kCFStringEncodingUTF8)) tags.emplace_back(tag);
+    }
+    CFRelease(names);
+  }
+#else
+  // The Harmony desktop host supplies LANGUAGE from the system i18n API.
+  const char* locale = std::getenv("LC_ALL");
+  if (!locale || !*locale) locale = std::getenv("LC_MESSAGES");
+  if (!locale || !*locale) locale = std::getenv("LANG");
+  if (locale && (std::string(locale) == "C" || std::string(locale) == "POSIX")) return kEnglishLanguage;
+  if (const char* preferred = std::getenv("LANGUAGE")) {
+    std::string list(preferred);
+    size_t start = 0;
+    do {
+      const auto end = list.find(':', start);
+      tags.push_back(list.substr(start, end - start));
+      if (end == std::string::npos) break;
+      start = end + 1;
+    } while (start < list.size());
+  }
+  if (locale) tags.emplace_back(locale);
+#endif
+  return MatchPreferredLanguages(tags);
+}
+
+inline int SystemLanguage() {
+  // Language changes take effect on the next application launch; explicit
+  // application preferences always win over this process-wide default.
+  static const int language = DetectSystemLanguage();
+  return language;
+}
+
+}  // namespace localization
+}  // namespace crossdesk
+
+#endif