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