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#include "js_shell.h"
#include <iostream>
#include <fstream>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#ifdef __GNUC__
#ifdef __APPLE__
#define LIBRARY_EXT ".bundle"
#else
#define LIBRARY_EXT ".so"
#endif
#include <dlfcn.h>
#define LOAD_LIBRARY(name) dlopen(name, RTLD_LAZY)
#define CLOSE_LIBRARY(handle) dlclose(handle)
#define LIBRARY_ERROR dlerror
#define LIBRARYFILE(name) std::string("lib").append(name).append(LIBRARY_EXT)
#else
#error "implement dll loading"
#endif
JSShell::~JSShell() {
for(std::vector<HANDLE>::iterator it = loaded_modules.begin();
it != loaded_modules.end(); ++it) {
HANDLE handle = *it;
CLOSE_LIBRARY(handle);
}
}
// TODO: this could be done more intelligent...
// - can we achieve source file relative loading?
// - better path resolution
std::string JSShell::LoadModule(const std::string& name, HANDLE* library) {
// works only for posix like OSs
size_t pathIdx = name.find_last_of("/");
std::string lib_name;
std::string module_name;
if (pathIdx == std::string::npos) {
module_name = name;
lib_name = std::string(name).append(LIBRARY_EXT);
} else {
std::string path = name.substr(0, pathIdx+1);
module_name = name.substr(pathIdx+1);
lib_name = path.append(module_name).append(LIBRARY_EXT);
}
std::string lib_path;
HANDLE handle = 0;
for (int i = 0; i < module_path.size(); ++i) {
lib_path = module_path[i] + "/" + lib_name;
if (access( lib_path.c_str(), F_OK ) != -1) {
handle = LOAD_LIBRARY(lib_path.c_str());
}
}
if(handle == 0) {
std::cerr << "Could not find module " << lib_path << ":"
<< std::endl << LIBRARY_ERROR() << std::endl;
return 0;
}
loaded_modules.push_back(handle);
*library = handle;
return module_name;
}
bool JSShell::RunScript(const std::string& scriptPath) {
std::string source = ReadFile(scriptPath);
if(!InitializeEngine()) return false;
// Node.js compatibility: make `print` available as `console.log()`
ExecuteScript("var console = {}; console.log = print;", "<console>");
if(!ExecuteScript(source, scriptPath)) {
return false;
}
return DisposeEngine();
}
bool JSShell::RunShell() {
if(!InitializeEngine()) return false;
static const int kBufferSize = 1024;
while (true) {
char buffer[kBufferSize];
printf("> ");
char* str = fgets(buffer, kBufferSize, stdin);
if (str == NULL) break;
std::string source(str);
ExecuteScript(source, "(shell)");
}
printf("\n");
return true;
}
std::string JSShell::ReadFile(const std::string& fileName)
{
std::string script;
std::ifstream file(fileName.c_str());
if (file.is_open()) {
while ( file.good() ) {
std::string line;
getline(file, line);
script.append(line);
script.append("\n");
}
file.close();
} else {
std::cout << "Unable to open file " << fileName << "." << std::endl;
}
return script;
}
#ifdef ENABLE_JSC
extern JSShell* JSCShell_Create();
#endif
#ifdef ENABLE_V8
extern JSShell* V8Shell_Create();
#endif
typedef JSShell*(*ShellFactory)();
static ShellFactory js_shell_factories[2] = {
#ifdef ENABLE_JSC
JSCShell_Create,
#else
0,
#endif
#ifdef ENABLE_V8
V8Shell_Create,
#else
0,
#endif
};
JSShell *JSShell::Create(Engine engine) {
if(js_shell_factories[engine] == 0) {
throw "Engine not available.";
}
return js_shell_factories[engine]();
}
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