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// Copyright 2008 Google Inc. All Rights Reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <v8.h>
#include <cstring>
#include <cstdio>
#include <cstdlib>
void RunShell(v8::Handle<v8::Context> context);
bool ExecuteString(v8::Handle<v8::String> source,
v8::Handle<v8::Value> name,
bool print_result);
v8::Handle<v8::Value> Print(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);
v8::Handle<v8::String> ReadFile(const char* name);
void ProcessRuntimeFlags(int argc, char* argv[]);
int main(int argc, char* argv[]) {
v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
v8::HandleScope handle_scope;
// Create a template for the global object.
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 'load' function to the C++ Load callback.
global->Set(v8::String::New("load"), v8::FunctionTemplate::New(Load));
// Bind the 'quit' function
global->Set(v8::String::New("quit"), v8::FunctionTemplate::New(Quit));
// Bind the 'version' function
global->Set(v8::String::New("version"), v8::FunctionTemplate::New(Version));
// Create a new execution environment containing the built-in
// functions
v8::Handle<v8::Context> context = v8::Context::New(NULL, global);
// Enter the newly created execution environment.
v8::Context::Scope context_scope(context);
RunShell(context);
// Evaluate the command-line argument expressions.
for (int i = 1; i < argc; i++) {
const char* expr = argv[i];
//fprintf (stderr, "arg: [%s]\n", expr);
v8::HandleScope handle_scope;
ExecuteString(v8::String::New(expr), v8::Undefined(), true);
}
return 0;
}
// Executes a string within the current v8 context.
bool ExecuteString(v8::Handle<v8::String> source,
v8::Handle<v8::Value> name,
bool print_result) {
v8::HandleScope handle_scope;
v8::TryCatch try_catch;
v8::Handle<v8::Script> script = v8::Script::Compile(source, name);
if (script.IsEmpty()) {
// Print errors that happened during compilation.
v8::String::AsciiValue error(try_catch.Exception());
printf("1\n%s\n", *error);
return false;
} else {
v8::Handle<v8::Value> result = script->Run();
if (result.IsEmpty()) {
// Print errors that happened during execution.
v8::String::AsciiValue error(try_catch.Exception());
printf("1\n%s\n", *error);
return false;
} else {
if (print_result && result->IsUndefined()) {
printf("0\n");
} else if (print_result && !result->IsUndefined()) {
// If all went well and the result wasn't undefined then print
// the returned value.
v8::String::AsciiValue str(result);
int nl = 0;
for (int i = 0; (*str)[i]; ++i) {
if ((*str)[i] == '\n') ++nl;
}
printf("%d\n%s\n", nl + 1, *str);
}
return true;
}
}
}
// The read-eval-execute loop of the shell.
void RunShell(v8::Handle<v8::Context> context) {
static const int kBufferSize = 128*1024;
char buffer[kBufferSize];
size_t n = fread(buffer, 1, kBufferSize, stdin);
if (n < 0) return;
//fprintf (stderr, "input text: [\n%s]\n", buffer);
v8::HandleScope handle_scope;
ExecuteString(v8::String::New(buffer), v8::Undefined(), false);
}
// The callback that is invoked by v8 whenever the JavaScript 'print'
// function is called. Prints its arguments on stdout separated by
// spaces and ending with a newline.
v8::Handle<v8::Value> Print(const v8::Arguments& args) {
bool first = true;
for (int i = 0; i < args.Length(); i++) {
v8::HandleScope handle_scope;
if (first) {
first = false;
} else {
printf(" ");
}
v8::String::AsciiValue str(args[i]);
printf("%s", *str);
}
printf("\n");
return v8::Undefined();
}
// The callback that is invoked by v8 whenever the JavaScript 'load'
// function is called. Loads, compiles and executes its argument
// JavaScript file.
v8::Handle<v8::Value> Load(const v8::Arguments& args) {
for (int i = 0; i < args.Length(); i++) {
v8::HandleScope handle_scope;
v8::String::AsciiValue file(args[i]);
v8::Handle<v8::String> source = ReadFile(*file);
if (source.IsEmpty()) {
return v8::ThrowException(v8::String::New("Error loading file"));
}
ExecuteString(source, v8::String::New(*file), false);
}
return v8::Undefined();
}
// The callback that is invoked by v8 whenever the JavaScript 'quit'
// function is called. Quits.
v8::Handle<v8::Value> Quit(const v8::Arguments& args) {
// If not arguments are given args[0] will yield undefined which
// converts to the integer value 0.
int exit_code = args[0]->Int32Value();
exit(exit_code);
return v8::Undefined();
}
v8::Handle<v8::Value> Version(const v8::Arguments& args) {
return v8::String::New(v8::V8::GetVersion());
}
// Reads a file into a v8 string.
v8::Handle<v8::String> ReadFile(const char* name) {
FILE* file = fopen(name, "rb");
if (file == NULL) return v8::Handle<v8::String>();
fseek(file, 0, SEEK_END);
int size = ftell(file);
rewind(file);
char* chars = new char[size + 1];
chars[size] = '\0';
for (int i = 0; i < size;) {
int read = fread(&chars[i], 1, size - i, file);
i += read;
}
fclose(file);
v8::Handle<v8::String> result = v8::String::New(chars, size);
delete[] chars;
return result;
}