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-// Copyright 2009 the V8 project authors. 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 <fcntl.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-
-void RunShell(v8::Handle<v8::Context> context);
-bool ExecuteString(v8::Handle<v8::String> source,
- v8::Handle<v8::Value> name,
- 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);
-v8::Handle<v8::String> ReadFile(const char* name);
-void ReportException(v8::TryCatch* handler);
-
-
-int RunMain(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 '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
- 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);
- bool run_shell = (argc == 1);
- for (int i = 1; i < argc; i++) {
- const char* str = argv[i];
- if (strcmp(str, "--shell") == 0) {
- run_shell = true;
- } else if (strcmp(str, "-f") == 0) {
- // Ignore any -f flags for compatibility with the other stand-
- // alone JavaScript engines.
- continue;
- } else if (strncmp(str, "--", 2) == 0) {
- printf("Warning: unknown flag %s.\nTry --help for options\n", str);
- } else if (strcmp(str, "-e") == 0 && i + 1 < argc) {
- // Execute argument given to -e option directly
- v8::HandleScope handle_scope;
- v8::Handle<v8::String> file_name = v8::String::New("unnamed");
- v8::Handle<v8::String> source = v8::String::New(argv[i + 1]);
- if (!ExecuteString(source, file_name, false, true))
- return 1;
- i++;
- } else {
- // Use all other arguments as names of files to load and run.
- v8::HandleScope handle_scope;
- v8::Handle<v8::String> file_name = v8::String::New(str);
- v8::Handle<v8::String> source = ReadFile(str);
- if (source.IsEmpty()) {
- printf("Error reading '%s'\n", str);
- return 1;
- }
- if (!ExecuteString(source, file_name, false, true))
- return 1;
- }
- }
- if (run_shell) RunShell(context);
- return 0;
-}
-
-
-int main(int argc, char* argv[]) {
- int result = RunMain(argc, argv);
- v8::V8::Dispose();
- return result;
-}
-
-
-// Extracts a C string from a V8 Utf8Value.
-const char* ToCString(const v8::String::Utf8Value& value) {
- return *value ? *value : "<string conversion failed>";
-}
-
-
-// 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::Utf8Value str(args[i]);
- const char* cstr = ToCString(str);
- printf("%s", cstr);
- }
- printf("\n");
- fflush(stdout);
- return v8::Undefined();
-}
-
-
-// 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.
-v8::Handle<v8::Value> Load(const v8::Arguments& args) {
- for (int i = 0; i < args.Length(); i++) {
- v8::HandleScope handle_scope;
- v8::String::Utf8Value file(args[i]);
- 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"));
- }
- if (!ExecuteString(source, v8::String::New(*file), false, false)) {
- return v8::ThrowException(v8::String::New("Error executing file"));
- }
- }
- 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;
-}
-
-
-// The read-eval-execute loop of the shell.
-void RunShell(v8::Handle<v8::Context> context) {
- printf("V8 version %s\n", v8::V8::GetVersion());
- static const int kBufferSize = 256;
- while (true) {
- char buffer[kBufferSize];
- printf("> ");
- char* str = fgets(buffer, kBufferSize, stdin);
- if (str == NULL) break;
- v8::HandleScope handle_scope;
- ExecuteString(v8::String::New(str),
- v8::String::New("(shell)"),
- true,
- true);
- }
- printf("\n");
-}
-
-
-// Executes a string within the current v8 context.
-bool ExecuteString(v8::Handle<v8::String> source,
- v8::Handle<v8::Value> name,
- bool print_result,
- bool report_exceptions) {
- 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.
- if (report_exceptions)
- ReportException(&try_catch);
- return false;
- } else {
- v8::Handle<v8::Value> result = script->Run();
- if (result.IsEmpty()) {
- // Print errors that happened during execution.
- if (report_exceptions)
- ReportException(&try_catch);
- return false;
- } else {
- if (print_result && !result->IsUndefined()) {
- // If all went well and the result wasn't undefined then print
- // the returned value.
- v8::String::Utf8Value str(result);
- const char* cstr = ToCString(str);
- printf("%s\n", cstr);
- }
- return true;
- }
- }
-}
-
-
-void ReportException(v8::TryCatch* try_catch) {
- v8::HandleScope handle_scope;
- v8::String::Utf8Value exception(try_catch->Exception());
- const char* exception_string = ToCString(exception);
- v8::Handle<v8::Message> message = try_catch->Message();
- if (message.IsEmpty()) {
- // V8 didn't provide any extra information about this error; just
- // print the exception.
- printf("%s\n", exception_string);
- } else {
- // Print (filename):(line number): (message).
- v8::String::Utf8Value filename(message->GetScriptResourceName());
- const char* filename_string = ToCString(filename);
- int linenum = message->GetLineNumber();
- printf("%s:%i: %s\n", filename_string, linenum, exception_string);
- // Print line of source code.
- v8::String::Utf8Value sourceline(message->GetSourceLine());
- const char* sourceline_string = ToCString(sourceline);
- printf("%s\n", sourceline_string);
- // Print wavy underline (GetUnderline is deprecated).
- int start = message->GetStartColumn();
- for (int i = 0; i < start; i++) {
- printf(" ");
- }
- int end = message->GetEndColumn();
- for (int i = start; i < end; i++) {
- printf("^");
- }
- printf("\n");
- }
-}