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implement grammar loading from Python

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This commit is contained in:
krangelov
2021-08-08 16:11:23 +02:00
parent 3a7743afad
commit 1088b4ef38
2 changed files with 36 additions and 46 deletions
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80
src/runtime/python/pypgf.c
View File

@@ -2,12 +2,7 @@
#include <Python.h>
#include "structmember.h"
#include <gu/mem.h>
#include <gu/map.h>
#include <gu/file.h>
#include <gu/utf8.h>
#include <pgf/pgf.h>
#include <pgf/linearizer.h>
#include <pgf.h>
#if PY_MAJOR_VERSION >= 3
#define PyIntObject PyLongObject
@@ -42,10 +37,9 @@ static PyObject* TypeError;
typedef struct {
PyObject_HEAD
GuPool* pool;
PgfPGF* pgf;
} PGFObject;
#if 0
typedef struct {
PyObject_HEAD
PyObject* master;
@@ -2820,15 +2814,14 @@ static PyTypeObject pgf_ConcrType = {
0, /*tp_alloc */
(newfunc)Concr_new, /*tp_new */
};
#endif
static void
PGF_dealloc(PGFObject* self)
{
if (self->pool != NULL)
gu_pool_free(self->pool);
pgf_free(self->pgf);
Py_TYPE(self)->tp_free((PyObject*)self);
}
#if 0
typedef struct {
GuMapItor fn;
PGFObject* grammar;
@@ -2843,11 +2836,11 @@ pgf_collect_langs_seq(GuMapItor* fn, const void* key, void* value, GuExn* err)
gu_buf_push((GuBuf*) clo->collection, PgfConcr*, concr);
}
#endif
static PyObject *
PGF_repr(PGFObject *self)
{
GuPool* tmp_pool = gu_local_pool();
/* GuPool* tmp_pool = gu_local_pool();
GuExn* err = gu_exn(tmp_pool);
GuStringBuf* sbuf = gu_new_string_buf(tmp_pool);
@@ -2866,9 +2859,10 @@ PGF_repr(PGFObject *self)
gu_string_buf_length(sbuf));
gu_pool_free(tmp_pool);
return pystr;
return pystr;*/
return NULL;
}
#if 0
static PyObject*
PGF_getAbstractName(PGFObject *self, void *closure)
{
@@ -3403,9 +3397,9 @@ PGF_embed(PGFObject* self, PyObject *args)
Py_INCREF(m);
return m;
}
#endif
static PyGetSetDef PGF_getseters[] = {
{"abstractName",
/* {"abstractName",
(getter)PGF_getAbstractName, NULL,
"the abstract syntax name",
NULL},
@@ -3424,7 +3418,7 @@ static PyGetSetDef PGF_getseters[] = {
{"functions",
(getter)PGF_getFunctions, NULL,
"a list containing all functions in the grammar",
NULL},
NULL},*/
{NULL} /* Sentinel */
};
@@ -3433,7 +3427,7 @@ static PyMemberDef PGF_members[] = {
};
static PyMethodDef PGF_methods[] = {
{"functionsByCat", (PyCFunction)PGF_functionsByCat, METH_VARARGS,
/* {"functionsByCat", (PyCFunction)PGF_functionsByCat, METH_VARARGS,
"Returns the list of functions for a given category"
},
{"functionType", (PyCFunction)PGF_functionType, METH_VARARGS,
@@ -3462,7 +3456,7 @@ static PyMethodDef PGF_methods[] = {
"contains one Python object for every abstract function in the grammar. "
"The module can be imported to make it easier to construct abstract "
"syntax trees."
},
},*/
{NULL} /* Sentinel */
};
@@ -3516,31 +3510,25 @@ pgf_readPGF(PyObject *self, PyObject *args)
return NULL;
PGFObject* py_pgf = (PGFObject*) pgf_PGFType.tp_alloc(&pgf_PGFType, 0);
py_pgf->pool = gu_new_pool();
GuPool* tmp_pool = gu_local_pool();
// Create an exception frame that catches all errors.
GuExn* err = gu_new_exn(tmp_pool);
// Read the PGF grammar.
py_pgf->pgf = pgf_read(fpath, py_pgf->pool, err);
if (!gu_ok(err)) {
if (gu_exn_caught(err, GuErrno)) {
errno = *((GuErrno*) gu_exn_caught_data(err));
PyErr_SetFromErrnoWithFilename(PyExc_IOError, fpath);
} else {
PyErr_SetString(PGFError, "The grammar cannot be loaded");
}
PgfExn err;
py_pgf->pgf = pgf_read_pgf(fpath, &err);
if (err.type == PGF_EXN_SYSTEM_ERROR) {
errno = err.code;
PyErr_SetFromErrnoWithFilename(PyExc_IOError, fpath);
Py_DECREF(py_pgf);
return NULL;
} else if (err.type == PGF_EXN_PGF_ERROR) {
PyErr_SetString(PGFError, err.msg);
free(err.msg);
Py_DECREF(py_pgf);
gu_pool_free(tmp_pool);
return NULL;
}
gu_pool_free(tmp_pool);
return py_pgf;
}
#if 0
static ExprObject*
pgf_readExpr(PyObject *self, PyObject *args) {
Py_ssize_t len;
@@ -3600,14 +3588,16 @@ pgf_readType(PyObject *self, PyObject *args) {
gu_pool_free(tmp_pool);
return pytype;
}
#endif
static PyMethodDef module_methods[] = {
{"readPGF", (void*)pgf_readPGF, METH_VARARGS,
"Reads a PGF file in memory"},
{"readExpr", (void*)pgf_readExpr, METH_VARARGS,
/* {"readExpr", (void*)pgf_readExpr, METH_VARARGS,
"Parses a string as an abstract tree"},
{"readType", (void*)pgf_readType, METH_VARARGS,
"Parses a string as an abstract type"},
*/
{NULL, NULL, 0, NULL} /* Sentinel */
};
@@ -3633,7 +3623,7 @@ MOD_INIT(pgf)
if (PyType_Ready(&pgf_PGFType) < 0)
return MOD_ERROR_VAL;
/*
if (PyType_Ready(&pgf_ConcrType) < 0)
return MOD_ERROR_VAL;
@@ -3651,16 +3641,16 @@ MOD_INIT(pgf)
if (PyType_Ready(&pgf_IterType) < 0)
return MOD_ERROR_VAL;
*/
MOD_DEF(m, "pgf", "The Runtime for Portable Grammar Format in Python",
module_methods);
if (m == NULL)
return MOD_ERROR_VAL;
PGFError = PyErr_NewException("pgf.PGFError", NULL, NULL);
PyModule_AddObject(m, "PGFError", PGFError);
Py_INCREF(PGFError);
PyObject *dict = PyDict_New();
PyDict_SetItemString(dict, "token", PyString_FromString(""));
ParseError = PyErr_NewException("pgf.ParseError", NULL, dict);
@@ -3670,7 +3660,7 @@ MOD_INIT(pgf)
TypeError = PyErr_NewException("pgf.TypeError", NULL, NULL);
PyModule_AddObject(m, "TypeError", TypeError);
Py_INCREF(TypeError);
/*
PyModule_AddObject(m, "Expr", (PyObject *) &pgf_ExprType);
Py_INCREF(&pgf_ExprType);
@@ -3691,6 +3681,6 @@ MOD_INIT(pgf)
PyModule_AddObject(m, "BIND", (PyObject *) &pgf_BINDType);
Py_INCREF(&pgf_BINDType);
*/
return MOD_SUCCESS_VAL(m);
}

2
src/runtime/python/setup.py
View File

@@ -13,7 +13,7 @@ pgf_module = Extension('pgf',
extra_compile_args = ['-std=c99'],
include_dirs = includes,
library_dirs = libraries,
libraries = ['gu', 'pgf'])
libraries = ['pgf'])
setup (name = 'pgf',
version = '1.0',