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#ifndef _PY_EVAL_H
#define _PY_EVAL_H
#include "valexpr.h"
#include "pyfstream.h"
#include <string>
#include <iostream>
#include <boost/python.hpp>
using namespace boost::python;
namespace ledger {
void shutdown_ledger_for_python();
class python_interpreter_t : public valexpr_t::scope_t
{
handle<> mmodule;
dict nspace;
public:
python_interpreter_t(valexpr_t::scope_t * parent);
virtual ~python_interpreter_t() {
Py_Finalize();
}
object import(const std::string& name);
enum py_eval_mode_t {
PY_EVAL_EXPR,
PY_EVAL_STMT,
PY_EVAL_MULTI
};
object eval(std::istream& in, py_eval_mode_t mode = PY_EVAL_EXPR);
object eval(const std::string& str, py_eval_mode_t mode = PY_EVAL_EXPR);
object eval(const char * c_str, py_eval_mode_t mode = PY_EVAL_EXPR) {
std::string str(c_str);
return eval(str, mode);
}
class functor_t : public valexpr_t::functor_t {
protected:
object func;
public:
python_functor_t(const std::string& name, object _func)
: valexpr_t::functor_t(name), func(_func) {}
virtual void operator()(value_t& result, valexpr_t::scope_t * locals);
};
virtual void define(const std::string& name, valexpr_t::node_t * def) {
// Pass any definitions up to our parent
parent->define(name, def);
}
virtual node_t * lookup(const std::string& name) {
object func = eval(name);
if (! func)
return parent ? parent->lookup(name) : NULL;
return valexpr_t::wrap_functor(new python_functor_t(name, func));
}
class lambda_t : public functor_t {
public:
python_lambda_t(object code) : python_functor_t("<lambda>"> code) {}
virtual void operator()(value_t& result, valexpr_t::scope_t * locals);
};
;
} // namespace ledger
#endif // _PY_EVAL_H
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