Refactored javascript shell implementation to support JSC and v8.

Also changed configuration in examples Makefile.in to allow switching modes.

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/branches/oliverb-javascript-v8@13783 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Tools/javascript/js_shell.cxx

@@ -0,0 +1,95 @@
+#include "js_shell.h"
+
+#include <iostream>
+#include <fstream>
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef __GNUC__
+#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(".so")
+#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);
+  }
+
+}
+
+bool JSShell::ImportModule(const std::string& name) {
+
+   std::string lib_name = LIBRARYFILE(name);
+
+    HANDLE handle = LOAD_LIBRARY(lib_name.c_str());
+    if(handle == 0) {
+      std::cout << "Could not load library " << lib_name << ":" 
+                << std::endl << LIBRARY_ERROR() << std::endl;
+      return false;
+    }
+    
+    if(!RegisterModule(handle, name)) {
+      std::cout << "Could not find initializer function in " << lib_name << std::endl;
+      CLOSE_LIBRARY(handle);
+      return false;
+    }
+
+    loaded_modules.push_back(handle); 
+    
+    return true;
+}
+
+bool JSShell::RunScript(const std::string& scriptPath) {
+  std::string source = ReadFile(scriptPath);
+  if(!InitializeEngine()) return false;
+
+  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");
+}
+
+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;
+}