added Graphviz visualizations

src/runtime/c/pgf/pgf.h

@@ -878,6 +878,12 @@ typedef struct {
     const char *leafEdgeStyle;
 } PgfGraphvizOptions;
 
+PGF_API_DECL PgfText *
+pgf_graphviz_abstract_tree(PgfDB *db, PgfRevision revision,
+                           PgfExpr expr, PgfMarshaller *m,
+                           PgfGraphvizOptions* opts,
+                           PgfExn *err);
+
 PGF_API_DECL PgfText *
 pgf_graphviz_parse_tree(PgfDB *db, PgfConcrRevision revision,
                         PgfExpr expr, PgfPrintContext *ctxt,

src/runtime/python/pgf.pyi

@@ -114,7 +114,7 @@ class PGF:
         """
         ...
 
-    def generateRandom(cat : Type, depth : int = 5) -> tuple[Expr,float]:
+    def generateRandom(self, cat : Type, depth : int = 5) -> tuple[Expr,float]:
         """
         Generates a random abstract syntax trees of the given type.
         The depth parameter specifies the maximal distance between
@@ -123,6 +123,16 @@ class PGF:
         """
         ...
 
+    def graphvizAbstractTree(self, e: Expr,
+                             noFun:bool=False, noCat:bool=False,
+                             nodeFont:str="",
+                             nodeColor:str="",
+                             nodeEdgeStyle:str="") -> str:
+        """
+        Renders an abstract syntax tree in a Graphviz format
+        """
+        ...
+
     def newTransaction(self) -> Transaction:
         """
         Starts a new transaction which makes it possible to update
@@ -208,11 +218,11 @@ class Concr:
         """The name of the concrete syntax"""
         ...
 
-    def linearize(e: Expr) -> str:
+    def linearize(self, e: Expr) -> str:
         """Linearizes the abstract expression and returns as string"""
         ...
 
-    def bracketedLinearize(e: Expr) -> list[Any]:
+    def bracketedLinearize(self, e: Expr) -> list[Any]:
         """
         Produces a bracketed linearization where syntactic phrases
         are represented as objects of type Bracket and terminal tokens
@@ -221,6 +231,22 @@ class Concr:
         """
         ...
 
+    def hasLinearization(self, fun: Str) -> bool:
+        """
+        Returns true if the given function has linearization in the concrete syntax
+        """
+        ...
+
+    def graphvizParseTree(self, e: Expr,
+                          noLeaves:bool=False, noFun:bool=False, noCat:bool=False,
+                          nodeFont:str="", leafFont:str="",
+                          nodeColor:str="", leafColor:str="",
+                          nodeEdgeStyle:str="", leafEdgeStyle:str="") -> str:
+        """
+        Renders an abstract syntax tree as a parse tree in Graphviz format
+        """
+        ...
+
 class PGFError:
     """
     This is the exception that several functions throw

src/runtime/python/pypgf.c

@@ -407,6 +407,47 @@ Concr_hasLinearization(ConcrObject* self, PyObject *args)
 		Py_RETURN_FALSE;
 }
 
+static PyObject*
+Concr_graphvizParseTree(ConcrObject* self, PyObject *args, PyObject *kwargs)
+{
+    PgfGraphvizOptions opts;
+    memset(&opts, 0, sizeof(opts));
+
+    char *kwds[] = {"","noLeaves","noFun","noCat",
+                       "nodeFont","leafFont",
+                       "nodeColor","leafColor",
+                       "nodeEdgeStyle","leafEdgeStyle",
+                    NULL};
+
+	ExprObject* pyexpr;
+	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O!|pppssssss", kwds,
+                                                   &pgf_ExprType, &pyexpr,
+                                                   &opts.noLeaves,
+                                                   &opts.noFun,
+                                                   &opts.noCat,
+                                                   &opts.nodeFont,
+                                                   &opts.leafFont,
+                                                   &opts.nodeColor,
+                                                   &opts.leafColor,
+                                                   &opts.nodeEdgeStyle,
+                                                   &opts.leafEdgeStyle))
+        return NULL;
+
+	PgfExn err;
+    PgfText *text =
+	   pgf_graphviz_parse_tree(self->grammar->db, self->concr,
+                               (PgfExpr) pyexpr, NULL, &marshaller,
+                               &opts, &err);
+    if (handleError(err) != PGF_EXN_NONE) {
+        return NULL;
+    }
+
+	PyObject* pystr = PyUnicode_FromStringAndSize(text->text, text->size);
+    free(text);
+
+	return pystr;
+}
+
 typedef struct {
 	PgfMorphoCallback fn;
 	PyObject* analyses;
@@ -519,10 +560,10 @@ static PyMethodDef Concr_methods[] = {
     },*/
     {"hasLinearization", (PyCFunction)Concr_hasLinearization, METH_VARARGS,
      "hasLinearization(f) returns true if the function f has linearization in the concrete syntax"
-    },/*
+    },
-    {"graphvizParseTree", (PyCFunction)Concr_graphvizParseTree, METH_VARARGS,
+    {"graphvizParseTree", (PyCFunction)Concr_graphvizParseTree, METH_VARARGS | METH_KEYWORDS,
      "Renders an abstract syntax tree as a parse tree in Graphviz format"
-    },*/
+    },
     {"lookupMorpho", (PyCFunction)Concr_lookupMorpho, METH_VARARGS,
      "Looks up a word in the lexicon of the grammar"
     },/*
@@ -993,6 +1034,40 @@ PGF_generateRandom(PGFObject *self, PyObject *args, PyObject *keywds)
     return res;
 }
 
+static PyObject*
+PGF_graphvizAbstractTree(PGFObject* self, PyObject *args, PyObject *kwargs) {
+    PgfGraphvizOptions opts;
+    memset(&opts, 0, sizeof(opts));
+
+    char *kwds[] = {"","noFun","noCat",
+                    "nodeFont", "nodeColor", "nodeEdgeStyle",
+                    NULL};
+
+	ExprObject* pyexpr;
+	if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O!|ppsss", kwds,
+                                                   &pgf_ExprType, &pyexpr,
+                                                   &opts.noFun,
+                                                   &opts.noCat,
+                                                   &opts.nodeFont,
+                                                   &opts.nodeColor,
+                                                   &opts.nodeEdgeStyle))
+        return NULL;
+
+	PgfExn err;
+    PgfText *text =
+	   pgf_graphviz_abstract_tree(self->db, self->revision,
+                                  (PgfExpr) pyexpr, &marshaller,
+                                  &opts, &err);
+    if (handleError(err) != PGF_EXN_NONE) {
+        return NULL;
+    }
+
+	PyObject* pystr = PyUnicode_FromStringAndSize(text->text, text->size);
+    free(text);
+
+	return pystr;
+}
+
 static PyObject *
 PGF_categoryProbability(PGFObject *self, PyObject *args)
 {
@@ -1537,6 +1612,9 @@ static PyMethodDef PGF_methods[] = {
     {"generateRandom", (PyCFunction)PGF_generateRandom, METH_VARARGS | METH_KEYWORDS,
      "Generates a random abstract syntax trees of the given type"
     },
+    {"graphvizAbstractTree", (PyCFunction)PGF_graphvizAbstractTree, METH_VARARGS | METH_KEYWORDS,
+     "Renders an abstract syntax tree in a Graphviz format"
+    },
     {"categoryProbability", (PyCFunction)PGF_categoryProbability, METH_VARARGS,
      "Returns the probability of a category"
     },

src/runtime/python/setup.py

@@ -35,7 +35,7 @@ pgf_module = Extension(
 
 setup(
     name = 'pgf-majestic',
-    version = '2.8',
+    version = '2.9',
     description = 'Python bindings to the Grammatical Framework\'s PGF runtime',
     long_description="""\
 Grammatical Framework (GF) is a programming language for multilingual grammar applications.