96 lines
2.1 KiB
C++
96 lines
2.1 KiB
C++
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// Scintilla source code edit control
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/** @file LexillaAccess.cxx
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** Interface to Lexilla shared library.
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**/
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// Copyright 2019 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <cstring>
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#include <iterator>
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#include <iostream>
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#include <filesystem>
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#if !_WIN32
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#include <dlfcn.h>
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#else
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#include <windows.h>
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#endif
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#include "ILexer.h"
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#include "Lexilla.h"
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#include "LexillaAccess.h"
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#if _WIN32
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#define EXT_LEXER_DECL __stdcall
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typedef FARPROC Function;
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typedef HMODULE Module;
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#else
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#define EXT_LEXER_DECL
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typedef void *Function;
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typedef void *Module;
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#endif
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typedef Scintilla::ILexer5 *(EXT_LEXER_DECL *CreateLexerFn)(const char *name);
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Module lexillaDL {};
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/// Generic function to convert from a Function(void* or FARPROC) to a function pointer.
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/// This avoids undefined and conditionally defined behaviour.
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template<typename T>
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T FunctionPointer(Function function) noexcept {
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static_assert(sizeof(T) == sizeof(function));
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T fp;
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memcpy(&fp, &function, sizeof(T));
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return fp;
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}
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CreateLexerFn fnCL;
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Function FindSymbol(const char *symbol) noexcept {
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#if _WIN32
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return ::GetProcAddress(lexillaDL, symbol);
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#else
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return dlsym(lexillaDL, symbol);
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#endif
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}
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Scintilla::ILexer5 *CreateLexer(std::string languageName) {
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#ifdef LEXILLA_STATIC
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return CreateLexer(languageName.c_str());
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#else
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return fnCL(languageName.c_str());
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#endif
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}
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bool LoadLexilla([[maybe_unused]] std::filesystem::path path) {
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#ifdef LEXILLA_STATIC
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return true;
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#else
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std::filesystem::path sharedLibrary = path;
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sharedLibrary.append("bin");
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#if _WIN32
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sharedLibrary.append("lexilla.dll");
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lexillaDL = ::LoadLibraryW(sharedLibrary.c_str());
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#else
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#if defined(__APPLE__)
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sharedLibrary.append("liblexilla.dylib");
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#else
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sharedLibrary.append("liblexilla.so");
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#endif
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lexillaDL = dlopen(sharedLibrary.c_str(), RTLD_LAZY);
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#endif
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if (lexillaDL) {
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fnCL = FunctionPointer<CreateLexerFn>(FindSymbol("CreateLexer"));
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} else {
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std::cout << "Cannot load " << sharedLibrary.string() << "\n";
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}
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return lexillaDL && fnCL;
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#endif
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}
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