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// Scintilla source code edit control
/** @file ExternalLexer.cxx
** Support external lexers in DLLs or shared libraries.
**/
// Copyright 2001 Simon Steele <ss@pnotepad.org>, portions copyright Neil Hodgson.
// The License.txt file describes the conditions under which this software may be distributed.
#include <cstdlib>
#include <cassert>
#include <cstring>
#include <stdexcept>
#include <string>
#include <string_view>
#include <vector>
#include <memory>
#include "Platform.h"
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "LexerModule.h"
#include "Catalogue.h"
#include "ExternalLexer.h"
using namespace Scintilla;
#if PLAT_WIN
#define EXT_LEXER_DECL __stdcall
#else
#define EXT_LEXER_DECL
#endif
namespace {
int nextLanguage = SCLEX_AUTOMATIC + 1;
typedef int (EXT_LEXER_DECL *GetLexerCountFn)();
typedef void (EXT_LEXER_DECL *GetLexerNameFn)(unsigned int Index, char *name, int buflength);
typedef LexerFactoryFunction(EXT_LEXER_DECL *GetLexerFactoryFunction)(unsigned int Index);
/// Generic function to convert from a void* to a function pointer.
/// This avoids undefined and conditionally defined behaviour.
template<typename T>
T FunctionPointer(void *function) noexcept {
static_assert(sizeof(T) == sizeof(function));
T fp;
memcpy(&fp, &function, sizeof(T));
return fp;
}
/// Sub-class of LexerModule to use an external lexer.
class ExternalLexerModule : public LexerModule {
protected:
GetLexerFactoryFunction fneFactory;
std::string name;
public:
ExternalLexerModule(int language_, LexerFunction fnLexer_,
const char *languageName_=nullptr, LexerFunction fnFolder_=nullptr) :
LexerModule(language_, fnLexer_, nullptr, fnFolder_),
fneFactory(nullptr), name(languageName_){
languageName = name.c_str();
}
void SetExternal(GetLexerFactoryFunction fFactory, int index) noexcept;
};
/// LexerLibrary exists for every External Lexer DLL, contains ExternalLexerModules.
class LexerLibrary {
std::unique_ptr<DynamicLibrary> lib;
std::vector<std::unique_ptr<ExternalLexerModule>> modules;
public:
explicit LexerLibrary(const char *moduleName_);
~LexerLibrary();
std::string moduleName;
};
/// LexerManager manages external lexers, contains LexerLibrarys.
class LexerManager {
public:
~LexerManager();
static LexerManager *GetInstance();
static void DeleteInstance() noexcept;
void Load(const char *path);
void Clear() noexcept;
private:
LexerManager();
static std::unique_ptr<LexerManager> theInstance;
std::vector<std::unique_ptr<LexerLibrary>> libraries;
};
class LMMinder {
public:
~LMMinder();
};
std::unique_ptr<LexerManager> LexerManager::theInstance;
//------------------------------------------
//
// ExternalLexerModule
//
//------------------------------------------
void ExternalLexerModule::SetExternal(GetLexerFactoryFunction fFactory, int index) noexcept {
fneFactory = fFactory;
fnFactory = fFactory(index);
}
//------------------------------------------
//
// LexerLibrary
//
//------------------------------------------
LexerLibrary::LexerLibrary(const char *moduleName_) {
// Load the DLL
lib.reset(DynamicLibrary::Load(moduleName_));
if (lib->IsValid()) {
moduleName = moduleName_;
GetLexerCountFn GetLexerCount = FunctionPointer<GetLexerCountFn>(lib->FindFunction("GetLexerCount"));
if (GetLexerCount) {
// Find functions in the DLL
GetLexerNameFn GetLexerName = FunctionPointer<GetLexerNameFn>(lib->FindFunction("GetLexerName"));
GetLexerFactoryFunction fnFactory = FunctionPointer<GetLexerFactoryFunction>(lib->FindFunction("GetLexerFactory"));
if (!GetLexerName || !fnFactory) {
return;
}
const int nl = GetLexerCount();
for (int i = 0; i < nl; i++) {
// Assign a buffer for the lexer name.
char lexname[100] = "";
GetLexerName(i, lexname, sizeof(lexname));
ExternalLexerModule *lex = new ExternalLexerModule(nextLanguage, nullptr, lexname, nullptr);
nextLanguage++;
// This is storing a second reference to lex in the Catalogue as well as in modules.
// TODO: Should use std::shared_ptr or similar to ensure allocation safety.
Catalogue::AddLexerModule(lex);
// Remember ExternalLexerModule so we don't leak it
modules.push_back(std::unique_ptr<ExternalLexerModule>(lex));
// The external lexer needs to know how to call into its DLL to
// do its lexing and folding, we tell it here.
lex->SetExternal(fnFactory, i);
}
}
}
}
LexerLibrary::~LexerLibrary() {
}
//------------------------------------------
//
// LexerManager
//
//------------------------------------------
/// Return the single LexerManager instance...
LexerManager *LexerManager::GetInstance() {
if (!theInstance)
theInstance.reset(new LexerManager);
return theInstance.get();
}
/// Delete any LexerManager instance...
void LexerManager::DeleteInstance() noexcept {
theInstance.reset();
}
/// protected constructor - this is a singleton...
LexerManager::LexerManager() {
}
LexerManager::~LexerManager() {
Clear();
}
void LexerManager::Load(const char *path) {
for (const std::unique_ptr<LexerLibrary> &ll : libraries) {
if (ll->moduleName == path)
return;
}
libraries.push_back(std::make_unique<LexerLibrary>(path));
}
void LexerManager::Clear() noexcept {
libraries.clear();
}
//------------------------------------------
//
// LMMinder -- trigger to clean up at exit.
//
//------------------------------------------
LMMinder::~LMMinder() {
LexerManager::DeleteInstance();
}
LMMinder minder;
}
namespace Scintilla {
void ExternalLexerLoad(const char *path) {
LexerManager::GetInstance()->Load(path);
}
}
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