#include "Python.h"

#include "code.h"
#include "compile.h"
#include "Python-ast.h"
#include "symtable.h"

static PyObject *
symtable_symtable(PyObject *self, PyObject *args)
{
	struct symtable *st;
	PyObject *t;

	char *str;
	char *filename;
	char *startstr;
	int start;

	if (!PyArg_ParseTuple(args, "sss:symtable", &str, &filename, 
			      &startstr))
		return NULL;
	if (strcmp(startstr, "exec") == 0)
		start = Py_file_input;
	else if (strcmp(startstr, "eval") == 0)
		start = Py_eval_input;
	else if (strcmp(startstr, "single") == 0)
		start = Py_single_input;
	else {
		PyErr_SetString(PyExc_ValueError,
		   "symtable() arg 3 must be 'exec' or 'eval' or 'single'");
		return NULL;
	}
	st = Py_SymtableString(str, filename, start);
	if (st == NULL)
		return NULL;
	t = st->st_blocks;
	Py_INCREF(t);
	PyMem_Free((void *)st->st_future);
	PySymtable_Free(st);
	return t;
}

static PyMethodDef symtable_methods[] = {
	{"symtable",	symtable_symtable,	METH_VARARGS,
	 PyDoc_STR("Return symbol and scope dictionaries"
	 	   " used internally by compiler.")},
	{NULL,		NULL}		/* sentinel */
};

static struct PyModuleDef symtablemodule = {
	PyModuleDef_HEAD_INIT,
	"_symtable",
	NULL,
	-1,
	symtable_methods,
	NULL,
	NULL,
	NULL,
	NULL
};

PyMODINIT_FUNC
PyInit__symtable(void)
{
	PyObject *m;

	m = PyModule_Create(&symtablemodule);
	if (m == NULL)
		return NULL;
	PyModule_AddIntConstant(m, "USE", USE);
	PyModule_AddIntConstant(m, "DEF_GLOBAL", DEF_GLOBAL);
	PyModule_AddIntConstant(m, "DEF_LOCAL", DEF_LOCAL);
	PyModule_AddIntConstant(m, "DEF_PARAM", DEF_PARAM);
	PyModule_AddIntConstant(m, "DEF_FREE", DEF_FREE);
	PyModule_AddIntConstant(m, "DEF_FREE_CLASS", DEF_FREE_CLASS);
	PyModule_AddIntConstant(m, "DEF_IMPORT", DEF_IMPORT);
	PyModule_AddIntConstant(m, "DEF_BOUND", DEF_BOUND);

	PyModule_AddIntConstant(m, "TYPE_FUNCTION", FunctionBlock);
	PyModule_AddIntConstant(m, "TYPE_CLASS", ClassBlock);
	PyModule_AddIntConstant(m, "TYPE_MODULE", ModuleBlock);

	PyModule_AddIntConstant(m, "OPT_IMPORT_STAR", OPT_IMPORT_STAR);
	PyModule_AddIntConstant(m, "OPT_TOPLEVEL", OPT_TOPLEVEL);

	PyModule_AddIntConstant(m, "LOCAL", LOCAL);
	PyModule_AddIntConstant(m, "GLOBAL_EXPLICIT", GLOBAL_EXPLICIT);
	PyModule_AddIntConstant(m, "GLOBAL_IMPLICIT", GLOBAL_IMPLICIT);
	PyModule_AddIntConstant(m, "FREE", FREE);
	PyModule_AddIntConstant(m, "CELL", CELL);

	PyModule_AddIntConstant(m, "SCOPE_OFF", SCOPE_OFFSET);
	PyModule_AddIntConstant(m, "SCOPE_MASK", SCOPE_MASK);

	if (PyErr_Occurred()) {
		Py_DECREF(m);
		m = 0;
	}
	return m;
}