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py_object_wrapper.cc
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248 lines (221 loc) · 8.76 KB
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#include "py_object_wrapper.h"
#include "utils.h"
Persistent<FunctionTemplate> PyObjectWrapper::py_function_template;
void PyObjectWrapper::Initialize() {
HandleScope scope;
Local<FunctionTemplate> fn_tpl = FunctionTemplate::New();
Local<ObjectTemplate> proto = fn_tpl->PrototypeTemplate();
Local<ObjectTemplate> obj_tpl = fn_tpl->InstanceTemplate();
obj_tpl->SetInternalFieldCount(1);
// this has first priority. see if the properties already exist on the python object
obj_tpl->SetNamedPropertyHandler(Get, Set);
// If we're calling `toString`, delegate to our version of ToString
proto->SetAccessor(String::NewSymbol("toString"), ToStringAccessor);
// likewise for valueOf
obj_tpl->SetAccessor(String::NewSymbol("valueOf"), ValueOfAccessor);
// Python objects can be called as functions.
obj_tpl->SetCallAsFunctionHandler(Call, Handle<Value>());
py_function_template = Persistent<FunctionTemplate>::New(fn_tpl);
}
Handle<Value> PyObjectWrapper::New(PyObject* obj) {
HandleScope scope;
Local<Value> jsVal;
// undefined
if(obj == Py_None) {
jsVal = Local<Value>::New(Undefined());
}
// double
else if(PyFloat_CheckExact(obj)) {
double d = PyFloat_AsDouble(obj);
jsVal = Local<Value>::New(Number::New(d));
}
// integer (can be 64b)
else if(PyInt_CheckExact(obj)) {
long i = PyInt_AsLong(obj);
jsVal = Local<Value>::New(Number::New((double) i));
}
// string
else if(PyString_CheckExact(obj)) {
// ref to internal representation: no need to dealloc
char *str = PyString_AsString(obj);
if(str) {
jsVal = Local<Value>::New(String::New(str));
}
}
else if(PyBool_Check(obj)) {
int b = PyObject_IsTrue(obj);
if(b != -1) {
jsVal = Local<Value>::New(Boolean::New(b));
}
}
if(PyErr_Occurred()) {
Py_XDECREF(obj);
return ThrowPythonException();
}
if(jsVal.IsEmpty()) {
Local<Object> jsObj = py_function_template->GetFunction()->NewInstance();
PyObjectWrapper* wrapper = new PyObjectWrapper(obj);
wrapper->Wrap(jsObj);
jsVal = Local<Value>::New(jsObj);
}
else {
Py_XDECREF(obj);
}
return scope.Close(jsVal);
}
Handle<Value> PyObjectWrapper::Get(Local<String> key, const AccessorInfo& info) {
// returning an empty Handle<Value> object signals V8 that we didn't
// find the property here, and we should check the "NamedAccessor" functions
HandleScope scope;
PyObjectWrapper* wrapper = ObjectWrap::Unwrap<PyObjectWrapper>(info.Holder());
String::Utf8Value utf8_key(key);
string value(*utf8_key);
PyObject* result = wrapper->InstanceGet(value);
if(result) {
return PyObjectWrapper::New(result);
}
return Handle<Value>();
}
Handle<Value> PyObjectWrapper::Set(Local<String> key, Local<Value> value, const AccessorInfo& info) {
// we don't know what to do.
return Undefined();
}
Handle<Value> PyObjectWrapper::CallAccessor(Local<String> property, const AccessorInfo& info) {
HandleScope scope;
Local<FunctionTemplate> func = FunctionTemplate::New(Call);
return scope.Close(func->GetFunction());
}
Handle<Value> PyObjectWrapper::ToStringAccessor(Local<String> property, const AccessorInfo& info) {
HandleScope scope;
Local<FunctionTemplate> func = FunctionTemplate::New(ToString);
return scope.Close(func->GetFunction());
}
Handle<Value> PyObjectWrapper::ValueOfAccessor(Local<String> property, const AccessorInfo& info) {
HandleScope scope;
Local<FunctionTemplate> func = FunctionTemplate::New(ValueOf);
return scope.Close(func->GetFunction());
}
Handle<Value> PyObjectWrapper::Call(const Arguments& args) {
HandleScope scope;
PyObjectWrapper* pyobjwrap = ObjectWrap::Unwrap<PyObjectWrapper>(args.This());
Handle<Value> result = pyobjwrap->InstanceCall(args);
return scope.Close(result);
}
Handle<Value> PyObjectWrapper::ToString(const Arguments& args) {
HandleScope scope;
PyObjectWrapper* pyobjwrap = ObjectWrap::Unwrap<PyObjectWrapper>(args.This());
Local<String> result = String::New(pyobjwrap->InstanceToString(args).c_str());
return scope.Close(result);
}
Handle<Value> PyObjectWrapper::ValueOf(const Arguments& args) {
HandleScope scope;
PyObjectWrapper* pyobjwrap = ObjectWrap::Unwrap<PyObjectWrapper>(args.This());
PyObject* py_obj = pyobjwrap->InstanceGetPyObject();
if(PyCallable_Check(py_obj)) {
Local<FunctionTemplate> call = FunctionTemplate::New(Call);
return scope.Close(call->GetFunction());
} else if (PyNumber_Check(py_obj)) {
long long_result = PyLong_AsLong(py_obj);
return scope.Close(Integer::New(long_result));
} else if (PySequence_Check(py_obj)) {
int len = PySequence_Length(py_obj);
Local<Array> array = Array::New(len);
for(int i = 0; i < len; ++i) {
Handle<Object> jsobj = PyObjectWrapper::py_function_template->GetFunction()->NewInstance();
PyObject* py_obj_out = PySequence_GetItem(py_obj, i);
PyObjectWrapper* obj_out = new PyObjectWrapper(py_obj_out);
obj_out->Wrap(jsobj);
array->Set(i, jsobj);
}
return scope.Close(array);
} else if (PyMapping_Check(py_obj)) {
int len = PyMapping_Length(py_obj);
Local<Object> object = Object::New();
PyObject* keys = PyMapping_Keys(py_obj);
PyObject* values = PyMapping_Values(py_obj);
for(int i = 0; i < len; ++i) {
PyObject *key = PySequence_GetItem(keys, i),
*value = PySequence_GetItem(values, i),
*key_as_string = PyObject_Str(key);
char* cstr = PyString_AsString(key_as_string);
Local<Object> jsobj = PyObjectWrapper::py_function_template->GetFunction()->NewInstance();
PyObjectWrapper* obj_out = new PyObjectWrapper(value);
obj_out->Wrap(jsobj);
Py_XDECREF(key);
Py_XDECREF(key_as_string);
}
Py_XDECREF(keys);
Py_XDECREF(values);
return scope.Close(object);
}
return Undefined();
}
PyObject* PyObjectWrapper::ConvertToPython(const Handle<Value>& value) {
int len;
HandleScope scope;
if(value->IsString()) {
return PyString_FromString(*String::Utf8Value(value->ToString()));
} else if(value->IsNumber()) {
return PyFloat_FromDouble(value->NumberValue());
} else if(value->IsObject()) {
Local<Object> obj = value->ToObject();
if(!obj->FindInstanceInPrototypeChain(PyObjectWrapper::py_function_template).IsEmpty()) {
PyObjectWrapper* python_object = ObjectWrap::Unwrap<PyObjectWrapper>(value->ToObject());
PyObject* pyobj = python_object->InstanceGetPyObject();
return pyobj;
} else {
Local<Array> property_names = obj->GetPropertyNames();
len = property_names->Length();
PyObject* py_dict = PyDict_New();
for(int i = 0; i < len; ++i) {
Local<String> str = property_names->Get(i)->ToString();
Local<Value> js_val = obj->Get(str);
PyDict_SetItemString(py_dict, *String::Utf8Value(str), ConvertToPython(js_val));
}
return py_dict;
}
return NULL;
} else if(value->IsArray()) {
Local<Array> array = Array::Cast(*value);
len = array->Length();
PyObject* py_list = PyList_New(len);
for(int i = 0; i < len; ++i) {
Local<Value> js_val = array->Get(i);
PyList_SET_ITEM(py_list, i, ConvertToPython(js_val));
}
return py_list;
} else if(value->IsUndefined()) {
Py_RETURN_NONE;
}
return NULL;
}
Handle<Value> PyObjectWrapper::InstanceCall(const Arguments& args) {
// for now, we don't do anything.
HandleScope scope;
int len = args.Length();
PyObject* args_tuple = PyTuple_New(len);
for(int i = 0; i < len; ++i) {
PyObject* py_arg = ConvertToPython(args[i]);
PyTuple_SET_ITEM(args_tuple, i, py_arg);
}
PyObject* result = PyObject_CallObject(mPyObject, args_tuple);
Py_XDECREF(args_tuple);
if(result) {
return scope.Close(PyObjectWrapper::New(result));
} else {
return ThrowPythonException();
}
}
string PyObjectWrapper::InstanceToString(const Arguments& args) {
PyObject* as_string = PyObject_Str(mPyObject);
string native_string(PyString_AsString(as_string));
Py_XDECREF(as_string);
return native_string;
}
PyObject* PyObjectWrapper::InstanceGet(const string& key) {
if(PyObject_HasAttrString(mPyObject, key.c_str())) {
PyObject* attribute = PyObject_GetAttrString(mPyObject, key.c_str());
return attribute;
}
return (PyObject*)NULL;
}