lok: Allow whitelisting languages that should be used by LibreOfficeKit.

LOK may get way too many languages if there are dictionaries for them
installed which blows the pre-init to >2G easily; let's allow limiting that.

Also make the preloading of languages work with the internal spell checking
dictionaries and thesauri.

Change-Id: I77119970030a7386a5cccbe4fdc89b15eab56ef1
Reviewed-on: https://gerrit.libreoffice.org/48720
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
(cherry picked from commit 3a68b21c212c1c2fc7f1d8f4d1abc8990bcd91c0)

1 files changed, 48 insertions, 0 deletions

diff --git a/comphelper/source/misc/lok.cxx b/comphelper/source/misc/lok.cxx
index 2e8624d1e8d0..589f57b61bce 100644
--- a/comphelper/source/misc/lok.cxx
+++ b/comphelper/source/misc/lok.cxx
@@ -9,6 +9,8 @@
 
 #include <comphelper/lok.hxx>
 
+#include <iostream>
+
 namespace comphelper
 {
 
@@ -112,6 +114,52 @@ const LanguageTag& getLanguageTag()
     return g_aLanguageTag;
 }
 
+bool isWhitelistedLanguage(const OUString& lang)
+{
+    if (!isActive())
+        return true;
+
+    static bool bInitialized = false;
+    static std::vector<OUString> aWhitelist;
+    if (!bInitialized)
+    {
+        const char* pWhitelist = getenv("LOK_WHITELIST_LANGUAGES");
+        if (pWhitelist)
+        {
+            std::stringstream stream(pWhitelist);
+            std::string s;
+
+            std::cerr << "Whitelisted languages: ";
+            while (getline(stream, s, ' ')) {
+                if (s.length() == 0)
+                    continue;
+
+                std::cerr << s << " ";
+                aWhitelist.emplace_back(OStringToOUString(s.c_str(), RTL_TEXTENCODING_UTF8));
+            }
+            std::cerr << std::endl;
+        }
+
+        if (aWhitelist.empty())
+            std::cerr << "No language whitelisted, turning off the language support." << std::endl;
+
+        bInitialized = true;
+    }
+
+    if (aWhitelist.empty())
+        return false;
+
+    for (auto& entry : aWhitelist)
+    {
+        if (lang.startsWith(entry))
+            return true;
+        if (lang.startsWith(entry.replace('_', '-')))
+            return true;
+    }
+
+    return false;
+}
+
 static void (*pStatusIndicatorCallback)(void *data, statusIndicatorCallbackType type, int percent)(nullptr);
 static void *pStatusIndicatorCallbackData(nullptr);