Created py-bindings.

3 files changed, 168 insertions, 0 deletions

diff --git a/contrib/py-bindings/Makefile b/contrib/py-bindings/Makefile
new file mode 100644
index 000000000..fafbdbb2b
--- /dev/null
+++ b/contrib/py-bindings/Makefile
@@ -0,0 +1,22 @@
+src=../../src
+import=-i$src/runtime/haskell:$src/compiler
+cbind=../c-bindings
+pythoninc=/usr/include/python2.5
+
+conf:
+	ln -s $(cbind)/PGFFFI.hs
+	ln -s $(cbind)/pgf.h
+Build: gf.so
+
+gf.so:  PGFFFI.hs gfmodule.c
+	gf --make ../../examples/tutorial/embedded/QueryEng.gf
+	ghc $(import) --make -fglasgow-exts -O2 -no-hs-main -c $<
+	ghc -O2 --make -fglasgow-exts -no-hs-main -optl '-shared' \
+	 -optc '-DMODULE=PGFFFI' -optc '-I$(pythoninc)' -o $@ $^
+clean:
+	rm -f *.hi  *.o
+	rm -f *_stub.*
+
+superclean: 
+	rm -f PGFFFI.hs pgf.h Query.pgf
+	rm -f gf.so
\ No newline at end of file
diff --git a/contrib/py-bindings/gfmodule.c b/contrib/py-bindings/gfmodule.c
new file mode 100644
index 000000000..1f983c6df
--- /dev/null
+++ b/contrib/py-bindings/gfmodule.c
@@ -0,0 +1,137 @@
+#define CAT(a,b) XCAT(a,b)
+#define XCAT(a,b) a ## b
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "pgf.h" 
+#include <Python.h>
+
+static PyObject*
+readPGF(PyObject *self, PyObject *args)
+{
+  char *path;
+  if (!PyArg_ParseTuple(args, "s", &path))
+    return NULL;
+  GF_PGF pgf = gf_readPGF(path);
+  return PyCObject_FromVoidPtr(pgf, gf_freePGF);
+}
+
+static PyObject*
+readLanguage(PyObject *self, PyObject *args)
+{
+  char *module_name;
+    if (!PyArg_ParseTuple(args, "s", &module_name))
+    return NULL;
+  GF_Language lang = gf_readLanguage(module_name);
+  return PyCObject_FromVoidPtr(lang, gf_freeLanguage);
+}
+
+static PyObject*
+showExpr(PyObject *self, PyObject *args)
+{
+  PyObject *co_exp;
+  GF_Expr exp;
+  if (!PyArg_ParseTuple(args, "O", &co_exp))
+    return NULL;
+  if (!PyCObject_Check(co_exp)) {
+    PyErr_SetString(PyExc_TypeError, "Expected an expression.");
+    return NULL;
+  }
+  exp = (GF_Expr)PyCObject_AsVoidPtr(co_exp);
+  char *str = gf_showExpr(exp);
+  return Py_BuildValue("s",str);
+}
+
+
+static PyObject*
+startCat(PyObject *self, PyObject *args)
+{
+  PyObject *cobj;
+  GF_PGF pgf;
+    if (!PyArg_ParseTuple(args, "O", &cobj))
+    return NULL;
+    if (!PyCObject_Check(cobj)) {
+      PyErr_SetString(PyExc_TypeError, "Expected a pgf object");
+      return NULL;
+    }
+   pgf = (GF_PGF)PyCObject_AsVoidPtr(cobj);
+   GF_Type cat = gf_startCat(pgf);
+  return PyCObject_FromVoidPtr(cat, gf_freeType);
+}
+
+static PyObject*
+parse(PyObject *self, PyObject *args)
+{
+  PyObject *co_pgf, *co_lang, *co_cat;
+  GF_PGF pgf;
+  GF_Language lang;
+  GF_Type cat;
+  char *lexed;
+  if (!PyArg_ParseTuple(args, "OOOs", &co_pgf, &co_lang, &co_cat, &lexed))
+    return NULL;
+  if (!PyCObject_Check(co_pgf)) {
+      PyErr_SetString(PyExc_TypeError, "Expected a PGF object");
+      return NULL;
+  }
+  if (!PyCObject_Check(co_lang)) {
+      PyErr_SetString(PyExc_TypeError, "Expected a Language object");
+      return NULL;
+  }
+  if (!PyCObject_Check(co_cat)) {
+      PyErr_SetString(PyExc_TypeError, "Expected a Type object");
+      return NULL;
+  }
+  pgf = (GF_PGF)PyCObject_AsVoidPtr(co_pgf);
+  lang = (GF_Language)PyCObject_AsVoidPtr(co_lang);
+  cat = (GF_Type)PyCObject_AsVoidPtr(co_cat);
+  GF_Tree *result = gf_parse(pgf, lang, cat, lexed);
+  GF_Tree *p = result;
+  PyObject *parsed = PyList_New(0);
+  if (*p) {
+    do {
+      GF_Expr exp = *(p++);
+      PyObject *co_exp = PyCObject_FromVoidPtr(exp,gf_freeExpr);
+      PyList_Append(parsed, co_exp);
+      /*      char *str = gf_showExpr(exp);
+      puts(str);
+      free(str); */
+    } while (*p);
+  }
+  return parsed;
+}
+
+
+
+
+
+static PyMethodDef GfMethods[] = {
+  {"read_pgf", readPGF, METH_VARARGS,
+   "Read pgf file"},
+  {"read_lang", readLanguage, METH_VARARGS,
+   "Get language from pgf."},
+  {"startcat", startCat, METH_VARARGS,
+   "Get start category from pgf."},
+  {"parse", parse, METH_VARARGS,
+   "Parse string for language and given start category."},
+  {"show_expr", showExpr, METH_VARARGS,
+   "show an expression."},
+  {NULL, NULL, 0, NULL}
+} ;
+
+PyMODINIT_FUNC
+initgf(void)
+{
+  PyObject *m = Py_InitModule("gf", GfMethods);
+  static char *argv[] = { "gf.so", 0 }, **argv_ = argv;
+  static int argc = 1;
+
+  gf_init (&argc, &argv_);
+  hs_add_root (CAT (__stginit_, MODULE));
+  printf("Started gf\n");
+  if (m == NULL) return;
+
+  /* gfError = PyErr_NewException("gf.error", NULL, NULL);
+  Py_INCREF(gfError);
+  PyModule_AddObject(m, "error", gfError);
+  */
+}
diff --git a/contrib/py-bindings/script.py b/contrib/py-bindings/script.py
new file mode 100644
index 000000000..6148fadea
--- /dev/null
+++ b/contrib/py-bindings/script.py
@@ -0,0 +1,9 @@
+#!/usr/bin/env python
+from gf import *
+query = read_pgf("Query.pgf")
+lang = read_lang('QueryEng')
+cat = startcat(query)
+lexed = "is 2 prime"
+print "Parsing '%s':" % lexed
+for e in parse(query, lang, cat, lexed):
+    print '\t',show_expr(e)