Add NPPM_CREATELEXER message for plugins to instantiate lexers

Fix #11789, close #11790

PowerEditor/src/MISC/PluginsManager/Notepad_plus_msgs.h

@@ -540,6 +540,9 @@ enum Platform { PF_UNKNOWN, PF_X86, PF_X64, PF_IA64, PF_ARM64 };
 	// Users should call it with commandLineStr as NULL to get the required number of TCHAR (not including the terminating nul character),
 	// allocate commandLineStr buffer with the return value + 1, then call it again to get the current command line string.
 
+	#define NPPM_CREATELEXER (NPPMSG + 110)
+	// void* NPPN_CREATELEXER(0, const TCHAR *lexer_name)
+	// Returns the ILexer pointer created by Lexilla
 
 #define VAR_NOT_RECOGNIZED 0
 #define FULL_CURRENT_PATH 1
@@ -734,4 +737,3 @@ enum Platform { PF_UNKNOWN, PF_X86, PF_X64, PF_IA64, PF_ARM64 };
 	//scnNotification->nmhdr.code = NPPN_CMDLINEPLUGINMSG;
 	//scnNotification->nmhdr.hwndFrom = hwndNpp;
 	//scnNotification->nmhdr.idFrom = pluginMessage; //where pluginMessage is pointer of type wchar_t
-

PowerEditor/src/NppBigSwitch.cpp

@@ -1386,6 +1386,13 @@ LRESULT Notepad_plus::process(HWND hwnd, UINT message, WPARAM wParam, LPARAM lPa
 			return cmdLineString.length();
 		}
 
+		case NPPM_CREATELEXER:
+		{
+			WcharMbcsConvertor& wmc = WcharMbcsConvertor::getInstance();
+			const char* lexer_name = wmc.wchar2char(reinterpret_cast<TCHAR*>(lParam), CP_ACP);
+			return (LRESULT) CreateLexer(lexer_name);
+		}
+
 		case WM_FRSAVE_INT:
 		{
 			_macro.push_back(recordedMacroStep(static_cast<int32_t>(wParam), 0, lParam, NULL, recordedMacroStep::mtSavedSnR));