Add support for loading external lexers to wxStyledTextCtrl

Implement Scintilla DynamicLibraryImpl and generate LoadLexerLibrary() and
GetLexerLanguage().

Closes #17480.

docs/changes.txt

@@ -63,6 +63,7 @@ All:
   wxLog::SetVerbose() which now only affects wxLogVerbose().
 - Add wxFileType::GetExpandedCommand() (troelsk).
 - Make it easier to convert to/from UTF-8-encoded std::string (ARATA Mizuki).
+- Add support for loading dynamic lexer in wxStyledTextCtrl (New Pagodi).
 
 All (GUI):
 

include/wx/stc/stc.h

@@ -4773,6 +4773,9 @@ public:
     // Set the lexing language of the document based on string name.
     void SetLexerLanguage(const wxString& language);
 
+    // Load a lexer library (dll / so).
+    void LoadLexerLibrary(const wxString& path);
+
     // Retrieve a 'property' value previously set with SetProperty.
     wxString GetProperty(const wxString& key);
 
@@ -4787,6 +4790,9 @@ public:
     // Retrieve the number of bits the current lexer needs for styling.
     int GetStyleBitsNeeded() const;
 
+    // Retrieve the lexing language of the document.
+    wxString GetLexerLanguage() const;
+
     // For private communication between an application and a known lexer.
     void* PrivateLexerCall(int operation, void* pointer);
 

interface/wx/stc/stc.h

@@ -6031,6 +6031,11 @@ public:
     */
     void SetLexerLanguage(const wxString& language);
 
+    /**
+        Load a lexer library (dll / so).
+    */
+    void LoadLexerLibrary(const wxString& path);
+
     /**
         Retrieve a 'property' value previously set with SetProperty.
     */
@@ -6053,6 +6058,11 @@ public:
     */
     int GetStyleBitsNeeded() const;
 
+    /**
+        Retrieve the lexing language of the document.
+    */
+    wxString GetLexerLanguage() const;
+
     /**
         For private communication between an application and a known lexer.
     */

src/stc/PlatWX.cpp

@@ -32,6 +32,7 @@
 #include "wx/image.h"
 #include "wx/imaglist.h"
 #include "wx/tokenzr.h"
+#include "wx/dynlib.h"
 
 #ifdef wxHAS_RAW_BITMAP
 #include "wx/rawbmp.h"
@@ -1440,9 +1441,37 @@ void Menu::Show(Point pt, Window &w) {
 
 //----------------------------------------------------------------------
 
-DynamicLibrary *DynamicLibrary::Load(const char *WXUNUSED(modulePath)) {
-    wxFAIL_MSG(wxT("Dynamic lexer loading not implemented yet"));
-    return NULL;
+class DynamicLibraryImpl : public DynamicLibrary {
+public:
+    explicit DynamicLibraryImpl(const char *modulePath)
+        : m_dynlib(wxString::FromUTF8(modulePath), wxDL_LAZY) {
+    }
+
+    // Use GetSymbol to get a pointer to the relevant function.
+    virtual Function FindFunction(const char *name) wxOVERRIDE {
+        if (m_dynlib.IsLoaded()) {
+            bool status;
+            void* fn_address = m_dynlib.GetSymbol(wxString::FromUTF8(name),
+                                                  &status);
+            if(status)
+                return fn_address;
+            else
+                return NULL;
+        }
+        else
+            return NULL;
+    }
+
+    virtual bool IsValid() wxOVERRIDE {
+        return m_dynlib.IsLoaded();
+    }
+
+private:
+    wxDynamicLibrary m_dynlib;
+};
+
+DynamicLibrary *DynamicLibrary::Load(const char *modulePath) {
+    return static_cast<DynamicLibrary *>( new DynamicLibraryImpl(modulePath) );
 }
 
 //----------------------------------------------------------------------

src/stc/gen_iface.py

@@ -762,12 +762,26 @@ methodOverrideMap = {
     'SetCursor' : ('SetSTCCursor', 0, 0, 0),
     'GetCursor' : ('GetSTCCursor', 0, 0, 0),
 
-    'LoadLexerLibrary' : (None, 0,0,0),
-
     'SetPositionCache' : ('SetPositionCacheSize', 0, 0, 0),
     'GetPositionCache' : ('GetPositionCacheSize', 0, 0, 0),
 
-    'GetLexerLanguage' : (None, 0, 0, 0),
+    'GetLexerLanguage' :(0,
+     'wxString %s() const;',
+
+     '''wxString %s() const {
+         const int msg = %s;
+         int len = SendMsg(msg, 0, (sptr_t)NULL);
+         if (!len) return wxEmptyString;
+
+         wxMemoryBuffer mbuf(len+1);
+         char* buf = (char*)mbuf.GetWriteBuf(len+1);
+         SendMsg(msg, 0, (sptr_t)buf);
+         mbuf.UngetWriteBuf(len);
+         mbuf.AppendByte(0);
+         return stc2wx(buf);''',
+
+         ('Retrieve the lexing language of the document.',)),
+
     'SetFontQuality' : (None, 0, 0, 0),
     'GetFontQuality' : (None, 0, 0, 0),
     'SetSelection' : (None, 0, 0, 0),

src/stc/stc.cpp

@@ -4365,6 +4365,12 @@ void wxStyledTextCtrl::SetLexerLanguage(const wxString& language)
     SendMsg(SCI_SETLEXERLANGUAGE, 0, (sptr_t)(const char*)wx2stc(language));
 }
 
+// Load a lexer library (dll / so).
+void wxStyledTextCtrl::LoadLexerLibrary(const wxString& path)
+{
+    SendMsg(SCI_LOADLEXERLIBRARY, 0, (sptr_t)(const char*)wx2stc(path));
+}
+
 // Retrieve a 'property' value previously set with SetProperty.
 wxString wxStyledTextCtrl::GetProperty(const wxString& key) {
          int len = SendMsg(SCI_GETPROPERTY, (sptr_t)(const char*)wx2stc(key), 0);
@@ -4405,6 +4411,20 @@ int wxStyledTextCtrl::GetStyleBitsNeeded() const
     return SendMsg(SCI_GETSTYLEBITSNEEDED, 0, 0);
 }
 
+// Retrieve the lexing language of the document.
+wxString wxStyledTextCtrl::GetLexerLanguage() const {
+         const int msg = SCI_GETLEXERLANGUAGE;
+         int len = SendMsg(msg, 0, (sptr_t)NULL);
+         if (!len) return wxEmptyString;
+
+         wxMemoryBuffer mbuf(len+1);
+         char* buf = (char*)mbuf.GetWriteBuf(len+1);
+         SendMsg(msg, 0, (sptr_t)buf);
+         mbuf.UngetWriteBuf(len);
+         mbuf.AppendByte(0);
+         return stc2wx(buf);
+}
+
 // For private communication between an application and a known lexer.
 void* wxStyledTextCtrl::PrivateLexerCall(int operation, void* pointer) {
            return (void*)(sptr_t)SendMsg(SCI_PRIVATELEXERCALL, operation, (sptr_t)pointer);