Add a "read" extension to the shell programs. This global function

reads the contents of a file into a string and returns it.

Review URL: http://codereview.chromium.org/67262

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1741 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

samples/shell.cc

@@ -38,6 +38,7 @@ bool ExecuteString(v8::Handle<v8::String> source,
                    bool print_result,
                    bool report_exceptions);
 v8::Handle<v8::Value> Print(const v8::Arguments& args);
+v8::Handle<v8::Value> Read(const v8::Arguments& args);
 v8::Handle<v8::Value> Load(const v8::Arguments& args);
 v8::Handle<v8::Value> Quit(const v8::Arguments& args);
 v8::Handle<v8::Value> Version(const v8::Arguments& args);
@@ -52,6 +53,8 @@ int RunMain(int argc, char* argv[]) {
   v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
   // Bind the global 'print' function to the C++ Print callback.
   global->Set(v8::String::New("print"), v8::FunctionTemplate::New(Print));
+  // Bind the global 'read' function to the C++ Read callback.
+  global->Set(v8::String::New("read"), v8::FunctionTemplate::New(Read));
   // Bind the global 'load' function to the C++ Load callback.
   global->Set(v8::String::New("load"), v8::FunctionTemplate::New(Load));
   // Bind the 'quit' function
@@ -135,6 +138,25 @@ v8::Handle<v8::Value> Print(const v8::Arguments& args) {
 }
 
 
+// The callback that is invoked by v8 whenever the JavaScript 'read'
+// function is called.  This function loads the content of the file named in
+// the argument into a JavaScript string.
+v8::Handle<v8::Value> Read(const v8::Arguments& args) {
+  if (args.Length() != 1) {
+    return v8::ThrowException(v8::String::New("Bad parameters"));
+  }
+  v8::String::Utf8Value file(args[0]);
+  if (*file == NULL) {
+    return v8::ThrowException(v8::String::New("Error loading file"));
+  }
+  v8::Handle<v8::String> source = ReadFile(*file);
+  if (source.IsEmpty()) {
+    return v8::ThrowException(v8::String::New("Error loading file"));
+  }
+  return source;
+}
+
+
 // The callback that is invoked by v8 whenever the JavaScript 'load'
 // function is called.  Loads, compiles and executes its argument
 // JavaScript file.

src/d8.cc

@@ -163,6 +163,22 @@ Handle<Value> Shell::Print(const Arguments& args) {
 }
 
 
+Handle<Value> Shell::Read(const Arguments& args) {
+  if (args.Length() != 1) {
+    return ThrowException(String::New("Bad parameters"));
+  }
+  String::Utf8Value file(args[0]);
+  if (*file == NULL) {
+    return ThrowException(String::New("Error loading file"));
+  }
+  Handle<String> source = ReadFile(*file);
+  if (source.IsEmpty()) {
+    return ThrowException(String::New("Error loading file"));
+  }
+  return source;
+}
+
+
 Handle<Value> Shell::Load(const Arguments& args) {
   for (int i = 0; i < args.Length(); i++) {
     HandleScope handle_scope;
@@ -381,6 +397,7 @@ void Shell::Initialize() {
   HandleScope scope;
   Handle<ObjectTemplate> global_template = ObjectTemplate::New();
   global_template->Set(String::New("print"), FunctionTemplate::New(Print));
+  global_template->Set(String::New("read"), FunctionTemplate::New(Read));
   global_template->Set(String::New("load"), FunctionTemplate::New(Load));
   global_template->Set(String::New("quit"), FunctionTemplate::New(Quit));
   global_template->Set(String::New("version"), FunctionTemplate::New(Version));
@@ -555,6 +572,8 @@ void ShellThread::Run() {
   Handle<ObjectTemplate> global_template = ObjectTemplate::New();
   global_template->Set(String::New("print"),
                        FunctionTemplate::New(Shell::Print));
+  global_template->Set(String::New("read"),
+                       FunctionTemplate::New(Shell::Read));
   global_template->Set(String::New("load"),
                        FunctionTemplate::New(Shell::Load));
   global_template->Set(String::New("yield"),

src/d8.h

@@ -139,6 +139,7 @@ class Shell: public i::AllStatic {
   static Handle<Value> Yield(const Arguments& args);
   static Handle<Value> Quit(const Arguments& args);
   static Handle<Value> Version(const Arguments& args);
+  static Handle<Value> Read(const Arguments& args);
   static Handle<Value> Load(const Arguments& args);
   // The OS object on the global object contains methods for performing
   // operating system calls: