20bce5e9 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id$ |
4 | * |
5 | * Atom stuff |
6 | * |
7 | * (c) 2005 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the Python interface to mLib. |
13 | * |
14 | * mLib/Python is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * mLib/Python is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with mLib/Python; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
31 | #include <Python.h> |
32 | |
33 | #include <mLib/atom.h> |
34 | #include <mLib/assoc.h> |
35 | #include <mLib/dstr.h> |
36 | |
37 | #include "atom.h" |
38 | #include "grim.h" |
39 | |
40 | /*----- Data structures ---------------------------------------------------*/ |
41 | |
42 | static PyTypeObject atom_pytype; |
43 | |
44 | typedef struct entry { |
45 | assoc_base _b; |
46 | PyObject *a; |
47 | } entry; |
48 | |
49 | /*----- Static variables --------------------------------------------------*/ |
50 | |
51 | static assoc_table obarray; |
52 | |
53 | /*----- Main code ---------------------------------------------------------*/ |
54 | |
55 | PyObject *atom_pywrap(atom *a) |
56 | { |
57 | entry *e; |
58 | unsigned f = 0; |
59 | |
60 | e = assoc_find(&obarray, a, sizeof(entry), &f); |
61 | if (!f) { |
62 | atom_pyobj *ao = PyObject_NEW(atom_pyobj, &atom_pytype); |
63 | ao->a = a; |
64 | e->a = (PyObject *)ao; |
65 | } |
66 | RETURN_OBJ(e->a); |
67 | } |
68 | |
69 | PyObject *atom_pyintern(PyObject *x) |
70 | { |
71 | atom *a; |
72 | const void *p; |
73 | int n; |
74 | |
75 | if (ATOM_PYCHECK(x)) |
76 | RETURN_OBJ(x); |
77 | if (x == Py_None) |
78 | a = atom_gensym(ATOM_GLOBAL); |
79 | else { |
80 | if (PyObject_AsReadBuffer(x, &p, &n)) return (0); |
81 | a = atom_nintern(ATOM_GLOBAL, p, n); |
82 | } |
83 | return (atom_pywrap(a)); |
84 | } |
85 | |
86 | static void atom_pydealloc(PyObject *me) |
87 | { fprintf(stderr, "ouch! freeing atom\n"); abort(); } |
88 | |
89 | static PyObject *atom_pynew(PyTypeObject *ty, PyObject *arg, PyObject *kw) |
90 | { |
91 | PyObject *name; |
92 | static char *kwlist[] = { "name", 0 }; |
93 | |
94 | if (!PyArg_ParseTupleAndKeywords(arg, kw, "O:new", kwlist, &name)) |
95 | return (0); |
96 | return (atom_pyintern(name)); |
97 | } |
98 | |
99 | static PyObject *aget_name(PyObject *me, void *hunoz) |
100 | { |
101 | return (PyString_FromStringAndSize(ATOM_NAME(ATOM_A(me)), |
102 | ATOM_LEN(ATOM_A(me)))); |
103 | } |
104 | |
105 | static PyObject *aget_internedp(PyObject *me, void *hunoz) |
106 | { |
107 | PyObject *rc = (ATOM_A(me)->f & ATOMF_GENSYM) ? Py_False : Py_True; |
108 | RETURN_OBJ(rc); |
109 | } |
110 | |
111 | static PyGetSetDef atom_pygetset[] = { |
112 | #define GETSETNAME(op, name) a##op##_##name |
113 | GET (name, "A.name -> NAME") |
114 | GET (internedp, "A.internedp -> BOOL") |
115 | #undef GETSETNAME |
116 | { 0 } |
117 | }; |
118 | |
119 | static PyObject *atom_pyrichcompare(PyObject *x, PyObject *y, int op) |
120 | { |
121 | PyObject *rc = 0; |
122 | |
123 | switch (op) { |
124 | case Py_EQ: rc = (x == y) ? Py_True : Py_False; break; |
125 | case Py_NE: rc = (x != y) ? Py_True : Py_False; break; |
126 | default: |
127 | PyErr_SetString(PyExc_TypeError, "atoms are unordered"); |
128 | return (0); |
129 | } |
130 | RETURN_OBJ(rc); |
131 | } |
132 | |
133 | static PyObject *atom_pyrepr(PyObject *me) |
134 | { |
135 | PyObject *s, *sr = 0; |
136 | PyObject *rc = 0; |
137 | char *p; |
138 | int n; |
139 | dstr d = DSTR_INIT; |
140 | |
141 | if ((s = aget_name(me, 0)) == 0 || |
142 | (sr = PyObject_Repr(s)) == 0 || |
143 | PyString_AsStringAndSize(sr, &p, &n)) |
144 | goto done; |
145 | dstr_puts(&d, "Atom("); |
146 | dstr_putm(&d, p, n); |
147 | dstr_puts(&d, ")"); |
148 | rc = PyString_FromStringAndSize(d.buf, d.len); |
149 | done: |
150 | Py_XDECREF(s); |
151 | Py_XDECREF(sr); |
152 | dstr_destroy(&d); |
153 | return (rc); |
154 | } |
155 | |
156 | static long atom_pyhash(PyObject *me) |
157 | { long h = ATOM_HASH(ATOM_A(me)); if (h == -1) h = -2; return (h); } |
158 | |
159 | static PyTypeObject atom_pytype = { |
160 | PyObject_HEAD_INIT(0) 0, /* Header */ |
161 | "atom.Atom", /* @tp_name@ */ |
162 | sizeof(atom_pyobj), /* @tp_basicsize@ */ |
163 | 0, /* @tp_itemsize@ */ |
164 | |
165 | atom_pydealloc, /* @tp_dealloc@ */ |
166 | 0, /* @tp_print@ */ |
167 | 0, /* @tp_getattr@ */ |
168 | 0, /* @tp_setattr@ */ |
169 | 0, /* @tp_compare@ */ |
170 | atom_pyrepr, /* @tp_repr@ */ |
171 | 0, /* @tp_as_number@ */ |
172 | 0, /* @tp_as_sequence@ */ |
173 | 0, /* @tp_as_mapping@ */ |
174 | atom_pyhash, /* @tp_hash@ */ |
175 | 0, /* @tp_call@ */ |
176 | atom_pyrepr, /* @tp_str@ */ |
177 | 0, /* @tp_getattro@ */ |
178 | 0, /* @tp_setattro@ */ |
179 | 0, /* @tp_as_buffer@ */ |
180 | Py_TPFLAGS_DEFAULT, /* @tp_flags@ */ |
181 | |
182 | /* @tp_doc@ */ |
183 | "Atom.", |
184 | |
185 | 0, /* @tp_traverse@ */ |
186 | 0, /* @tp_clear@ */ |
187 | atom_pyrichcompare, /* @tp_richcompare@ */ |
188 | 0, /* @tp_weaklistoffset@ */ |
189 | 0, /* @tp_iter@ */ |
190 | 0, /* @tp_iternexr@ */ |
191 | 0, /* @tp_methods@ */ |
192 | 0, /* @tp_members@ */ |
193 | atom_pygetset, /* @tp_getset@ */ |
194 | 0, /* @tp_base@ */ |
195 | 0, /* @tp_dict@ */ |
196 | 0, /* @tp_descr_get@ */ |
197 | 0, /* @tp_descr_set@ */ |
198 | 0, /* @tp_dictoffset@ */ |
199 | 0, /* @tp_init@ */ |
200 | PyType_GenericAlloc, /* @tp_alloc@ */ |
201 | atom_pynew, /* @tp_new@ */ |
202 | 0, /* @tp_free@ */ |
203 | 0 /* @tp_is_gc@ */ |
204 | }; |
205 | |
206 | PyObject *atom_pystartup(void) |
207 | { |
208 | assoc_create(&obarray); |
209 | PyType_Ready(&atom_pytype); |
210 | return ((PyObject *)&atom_pytype); |
211 | } |
212 | |
213 | /*----- That's all, folks -------------------------------------------------*/ |