node/src/node_script.cc at master · neseiza/node · GitHub

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "node.h"

#include "node_script.h"

#include <assert.h>

namespace node {

using v8::Context;

using v8::Script;

using v8::Value;

using v8::Handle;

using v8::HandleScope;

using v8::Object;

using v8::Arguments;

using v8::ThrowException;

using v8::TryCatch;

using v8::String;

using v8::Exception;

using v8::Local;

using v8::Array;

using v8::Persistent;

using v8::Integer;

using v8::Function;

using v8::FunctionTemplate;

class WrappedContext : ObjectWrap {

public:

static void Initialize(Handle<Object> target);

static Handle<Value> New(const Arguments& args);

Persistent<Context> GetV8Context();

static Local<Object> NewInstance();

static bool InstanceOf(Handle<Value> value);

protected:

static Persistent<FunctionTemplate> constructor_template;

WrappedContext();

~WrappedContext();

Persistent<Context> context_;

};

Persistent<FunctionTemplate> WrappedContext::constructor_template;

class WrappedScript : ObjectWrap {

public:

static void Initialize(Handle<Object> target);

enum EvalInputFlags { compileCode, unwrapExternal };

enum EvalContextFlags { thisContext, newContext, userContext };

enum EvalOutputFlags { returnResult, wrapExternal };

template <EvalInputFlags input_flag,

EvalContextFlags context_flag,

EvalOutputFlags output_flag>

static Handle<Value> EvalMachine(const Arguments& args);

protected:

static Persistent<FunctionTemplate> constructor_template;

WrappedScript() : ObjectWrap() {}

~WrappedScript();

static Handle<Value> New(const Arguments& args);

static Handle<Value> CreateContext(const Arguments& arg);

static Handle<Value> RunInContext(const Arguments& args);

static Handle<Value> RunInThisContext(const Arguments& args);

static Handle<Value> RunInNewContext(const Arguments& args);

static Handle<Value> CompileRunInContext(const Arguments& args);

static Handle<Value> CompileRunInThisContext(const Arguments& args);

static Handle<Value> CompileRunInNewContext(const Arguments& args);

Persistent<Script> script_;

};

Persistent<Function> cloneObjectMethod;

void CloneObject(Handle<Object> recv,

Handle<Value> source, Handle<Value> target) {

HandleScope scope;

Handle<Value> args[] = {source, target};

// Init

if (cloneObjectMethod.IsEmpty()) {

Local<Function> cloneObjectMethod_ = Local<Function>::Cast(

Script::Compile(String::New(

"(function(source, target) {\n\

Object.getOwnPropertyNames(source).forEach(function(key) {\n\

try {\n\

var desc = Object.getOwnPropertyDescriptor(source, key);\n\

if (desc.value === source) desc.value = target;\n\

Object.defineProperty(target, key, desc);\n\

} catch (e) {\n\

// Catch sealed properties errors\n\

}\n\

});\n\

})"

), String::New("binding:script"))->Run()

);

cloneObjectMethod = Persistent<Function>::New(cloneObjectMethod_);

}

cloneObjectMethod->Call(recv, 2, args);

}

void WrappedContext::Initialize(Handle<Object> target) {

HandleScope scope;

Local<FunctionTemplate> t = FunctionTemplate::New(WrappedContext::New);

constructor_template = Persistent<FunctionTemplate>::New(t);

constructor_template->InstanceTemplate()->SetInternalFieldCount(1);

constructor_template->SetClassName(String::NewSymbol("Context"));

target->Set(String::NewSymbol("Context"),

constructor_template->GetFunction());

}

bool WrappedContext::InstanceOf(Handle<Value> value) {

return !value.IsEmpty() && constructor_template->HasInstance(value);

}

Handle<Value> WrappedContext::New(const Arguments& args) {

HandleScope scope;

WrappedContext *t = new WrappedContext();

t->Wrap(args.This());

return args.This();

}

WrappedContext::WrappedContext() : ObjectWrap() {

context_ = Context::New();

}

WrappedContext::~WrappedContext() {

context_.Dispose();

}

Local<Object> WrappedContext::NewInstance() {

Local<Object> context = constructor_template->GetFunction()->NewInstance();

return context;

}

Persistent<Context> WrappedContext::GetV8Context() {

return context_;

}

Persistent<FunctionTemplate> WrappedScript::constructor_template;

void WrappedScript::Initialize(Handle<Object> target) {

HandleScope scope;

Local<FunctionTemplate> t = FunctionTemplate::New(WrappedScript::New);

constructor_template = Persistent<FunctionTemplate>::New(t);

constructor_template->InstanceTemplate()->SetInternalFieldCount(1);

// Note: We use 'NodeScript' instead of 'Script' so that we do not

// conflict with V8's Script class defined in v8/src/messages.js

// See GH-203 https://github.com/joyent/node/issues/203

constructor_template->SetClassName(String::NewSymbol("NodeScript"));

NODE_SET_PROTOTYPE_METHOD(constructor_template,

"createContext",

WrappedScript::CreateContext);

NODE_SET_PROTOTYPE_METHOD(constructor_template,

"runInContext",

WrappedScript::RunInContext);

NODE_SET_PROTOTYPE_METHOD(constructor_template,

"runInThisContext",

WrappedScript::RunInThisContext);

NODE_SET_PROTOTYPE_METHOD(constructor_template,

"runInNewContext",

WrappedScript::RunInNewContext);

NODE_SET_METHOD(constructor_template,

"createContext",

WrappedScript::CreateContext);

NODE_SET_METHOD(constructor_template,

"runInContext",

WrappedScript::CompileRunInContext);

NODE_SET_METHOD(constructor_template,

"runInThisContext",

WrappedScript::CompileRunInThisContext);

NODE_SET_METHOD(constructor_template,

"runInNewContext",

WrappedScript::CompileRunInNewContext);

target->Set(String::NewSymbol("NodeScript"),

constructor_template->GetFunction());

}

Handle<Value> WrappedScript::New(const Arguments& args) {

if (!args.IsConstructCall()) {

return FromConstructorTemplate(constructor_template, args);

}

HandleScope scope;

WrappedScript *t = new WrappedScript();

t->Wrap(args.Holder());

return

WrappedScript::EvalMachine<compileCode, thisContext, wrapExternal>(args);

}

WrappedScript::~WrappedScript() {

script_.Dispose();

}

Handle<Value> WrappedScript::CreateContext(const Arguments& args) {

HandleScope scope;

Local<Object> context = WrappedContext::NewInstance();

if (args.Length() > 0) {

if (args[0]->IsObject()) {

Local<Object> sandbox = args[0].As<Object>();

CloneObject(args.This(), sandbox, context);

} else {

return ThrowException(Exception::TypeError(String::New(

"createContext() accept only object as first argument.")));

}

return scope.Close(context);

}

Handle<Value> WrappedScript::RunInContext(const Arguments& args) {

return

WrappedScript::EvalMachine<unwrapExternal, userContext, returnResult>(args);

}

Handle<Value> WrappedScript::RunInThisContext(const Arguments& args) {

return

WrappedScript::EvalMachine<unwrapExternal, thisContext, returnResult>(args);

}

Handle<Value> WrappedScript::RunInNewContext(const Arguments& args) {

return

WrappedScript::EvalMachine<unwrapExternal, newContext, returnResult>(args);

}

Handle<Value> WrappedScript::CompileRunInContext(const Arguments& args) {

return

WrappedScript::EvalMachine<compileCode, userContext, returnResult>(args);

}

Handle<Value> WrappedScript::CompileRunInThisContext(const Arguments& args) {

return

WrappedScript::EvalMachine<compileCode, thisContext, returnResult>(args);

}

Handle<Value> WrappedScript::CompileRunInNewContext(const Arguments& args) {

return

WrappedScript::EvalMachine<compileCode, newContext, returnResult>(args);

}

template <WrappedScript::EvalInputFlags input_flag,

WrappedScript::EvalContextFlags context_flag,

WrappedScript::EvalOutputFlags output_flag>

Handle<Value> WrappedScript::EvalMachine(const Arguments& args) {

HandleScope scope;

if (input_flag == compileCode && args.Length() < 1) {

return ThrowException(Exception::TypeError(

String::New("needs at least 'code' argument.")));

}

const int sandbox_index = input_flag == compileCode ? 1 : 0;

if (context_flag == userContext

&& !WrappedContext::InstanceOf(args[sandbox_index]))

{

return ThrowException(Exception::TypeError(

String::New("needs a 'context' argument.")));

}

Local<String> code;

if (input_flag == compileCode) code = args[0]->ToString();

Local<Object> sandbox;

if (context_flag == newContext) {

sandbox = args[sandbox_index]->IsObject() ? args[sandbox_index]->ToObject()

: Object::New();

} else if (context_flag == userContext) {

sandbox = args[sandbox_index]->ToObject();

}

const int filename_index = sandbox_index +

(context_flag == thisContext? 0 : 1);

Local<String> filename = args.Length() > filename_index

? args[filename_index]->ToString()

: String::New("evalmachine.<anonymous>");

const int display_error_index = args.Length() - 1;

bool display_error = false;

if (args.Length() > display_error_index &&

args[display_error_index]->IsBoolean() &&

args[display_error_index]->BooleanValue() == true) {

display_error = true;

}

Handle<Context> context = Context::GetCurrent();

Local<Array> keys;

if (context_flag == newContext) {

// Create the new context

// Context::New returns a Persistent<Context>, but we only need it for this

// function. Here we grab a temporary handle to the new context, assign it

// to a local handle, and then dispose the persistent handle. This ensures

// that when this function exits the context will be disposed.

Persistent<Context> tmp = Context::New();

context = Local<Context>::New(tmp);

tmp.Dispose();

} else if (context_flag == userContext) {

// Use the passed in context

WrappedContext *nContext = ObjectWrap::Unwrap<WrappedContext>(sandbox);

context = nContext->GetV8Context();

}

Context::Scope context_scope(context);

// New and user context share code. DRY it up.

if (context_flag == userContext || context_flag == newContext) {

// Copy everything from the passed in sandbox (either the persistent

// context for runInContext(), or the sandbox arg to runInNewContext()).

CloneObject(args.This(), sandbox, context->Global()->GetPrototype());

}

// Catch errors

TryCatch try_catch;

Handle<Value> result;

Handle<Script> script;

if (input_flag == compileCode) {

// well, here WrappedScript::New would suffice in all cases, but maybe

// Compile has a little better performance where possible

script = output_flag == returnResult ? Script::Compile(code, filename)

: Script::New(code, filename);

if (script.IsEmpty()) {

// FIXME UGLY HACK TO DISPLAY SYNTAX ERRORS.

if (display_error) DisplayExceptionLine(try_catch);

// Hack because I can't get a proper stacktrace on SyntaxError

return try_catch.ReThrow();

}

} else {

WrappedScript *n_script = ObjectWrap::Unwrap<WrappedScript>(args.Holder());

if (!n_script) {

return ThrowException(Exception::Error(

String::New("Must be called as a method of Script.")));

} else if (n_script->script_.IsEmpty()) {

return ThrowException(Exception::Error(

String::New("'this' must be a result of previous "

"new Script(code) call.")));

}

script = n_script->script_;

}

if (output_flag == returnResult) {

result = script->Run();

if (result.IsEmpty()) {

return try_catch.ReThrow();

}

} else {

WrappedScript *n_script = ObjectWrap::Unwrap<WrappedScript>(args.Holder());

if (!n_script) {

return ThrowException(Exception::Error(

String::New("Must be called as a method of Script.")));

}

n_script->script_ = Persistent<Script>::New(script);

result = args.This();

}

if (context_flag == userContext || context_flag == newContext) {

// success! copy changes back onto the sandbox object.

CloneObject(args.This(), context->Global()->GetPrototype(), sandbox);

}

return result == args.This() ? result : scope.Close(result);

}

void InitEvals(Handle<Object> target) {

HandleScope scope;

WrappedContext::Initialize(target);

WrappedScript::Initialize(target);

}

} // namespace node

NODE_MODULE(node_evals, node::InitEvals)

node/src/node_script.cc at master · neseiza/node · GitHub

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