-
Notifications
You must be signed in to change notification settings - Fork 138
/
eventhandler.pmc
309 lines (199 loc) · 6.56 KB
/
eventhandler.pmc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
/*
Copyright (C) 2007-2010, Parrot Foundation.
$Id$
=head1 NAME
src/pmc/eventhandler.pmc - a handler for events
=head1 DESCRIPTION
A PMC that captures the state of the interpreter to invoke when handling an
Event.
=head2 Vtable Functions
=over 4
=cut
*/
/* HEADERIZER HFILE: none */
/* HEADERIZER BEGIN: static */
/* HEADERIZER END: static */
pmclass EventHandler extends Sub provides invokable auto_attrs {
ATTR STRING *type; /* the type of the event to handle */
ATTR PMC *code; /* the code object to execute */
ATTR PMC *interp; /* the registered interpreter */
ATTR INTVAL priority; /* the minimum priority threshhold of events */
/*
=item C<void init()>
Initializes an empty C<EventHandler>. Add attributes to it if you want it to
do anything.
=cut
*/
VTABLE void init() {
PObj_custom_mark_SET(SELF);
PObj_custom_destroy_SET(SELF);
}
/*
=item C<void init_pmc(PMC *data)>
Initializes a new EventHandler with either a C<Sub> PMC (or descendant) or a
C<Hash> PMC. With the latter, the keys should be any or all of:
=over 4
=item C<code>
a C<Sub> (or descendant) PMC containing code to invoke when handling the event
=item C<interp>
a C<ParrotInterpreter> PMC in which to invoke the code PMC
=item C<type>
a STRING recording the type of event to handle
=item C<priority>
the minimum threshhold of priority which the event must meet or exceed for the
handler to care
=back
=cut
*/
VTABLE void init_pmc(PMC *data) {
PMC *code = NULL;
PMC *interpreter = PMCNULL;
STRING *type = NULL;
INTVAL priority = 0;
Parrot_EventHandler_attributes *e =
(Parrot_EventHandler_attributes *) PMC_data(SELF);
if (VTABLE_isa(INTERP, data, CONST_STRING(INTERP, "Sub"))) {
code = data;
}
else if (VTABLE_isa(INTERP, data, CONST_STRING(INTERP, "Hash"))) {
code = VTABLE_get_pmc_keyed_str(INTERP, data, CONST_STRING(INTERP, "code"));
interpreter = VTABLE_get_pmc_keyed_str(INTERP, data, CONST_STRING(INTERP, "interp"));
type = VTABLE_get_string_keyed_str(INTERP, data, CONST_STRING(INTERP, "type"));
priority = VTABLE_get_integer_keyed_str(INTERP, data, CONST_STRING(INTERP, "priority"));
}
else {
Parrot_ex_throw_from_c_args(INTERP, NULL, EXCEPTION_INVALID_OPERATION,
"EventHandler initializer must be Sub or Hash");
}
if (PMC_IS_NULL(interpreter))
interpreter = VTABLE_get_pmc_keyed_int(INTERP,
INTERP->iglobals, IGLOBALS_INTERPRETER);
PObj_custom_mark_SET(SELF);
PObj_custom_destroy_SET(SELF);
e->type = type;
e->code = code;
e->interp = interpreter;
e->priority = priority;
}
/*
=item C<void mark()>
Marks this PMC and any of its contents as live.
=cut
*/
VTABLE void mark() {
Parrot_EventHandler_attributes * const e = PARROT_EVENTHANDLER(SELF);
if (e) {
Parrot_gc_mark_STRING_alive(INTERP, e->type);
Parrot_gc_mark_PMC_alive(INTERP, e->interp);
Parrot_gc_mark_PMC_alive(INTERP, e->code);
SUPER();
}
}
/*
=item C<void set_string(STRING *type)>
Sets the C<type> attribute of this event handler to the passed-in string.
=cut
*/
VTABLE void set_string(STRING *type) {
Parrot_EventHandler_attributes * const e = PARROT_EVENTHANDLER(SELF);
if (e)
e->type = type;
}
/*
=item C<STRING *get_string()>
Retrieves the C<type> attribute of this event handler.
=cut
*/
VTABLE STRING *get_string() {
Parrot_EventHandler_attributes * const e = PARROT_EVENTHANDLER(SELF);
if (e)
return e->type;
return CONST_STRING(INTERP, "");
}
/*
=item C<void set_integer_native(INTVAL priority)>
Sets the minimum interesting priority for this event handler.
=cut
*/
VTABLE void set_integer_native(INTVAL priority) {
Parrot_EventHandler_attributes * const e = PARROT_EVENTHANDLER(SELF);
if (e)
e->priority = priority;
}
/*
=item C<void set_pmc(PMC *interpreter)>
Sets the passed-in C<ParrotInterpreter> as the active interpreter in which to
handle the registered events.
=cut
*/
VTABLE void set_pmc(PMC *interpreter) {
Parrot_EventHandler_attributes * const e = PARROT_EVENTHANDLER(SELF);
if (e)
e->interp = interpreter;
}
/*
=item C<PMC *get_attr_str(STRING *name)>
=cut
*/
VTABLE PMC *get_attr_str(STRING *name) {
Parrot_EventHandler_attributes * const e = PARROT_EVENTHANDLER(SELF);
PMC *value = PMCNULL;
if (STRING_equal(INTERP, name, CONST_STRING(INTERP, "code"))) {
value = e->code;
}
return value;
}
/*
=item C<opcode_t *invoke(void *next)>
Runs the contained code, if any; this is what handles the event.
=cut
*/
VTABLE opcode_t *invoke(void *next) {
Parrot_EventHandler_attributes * const e = PARROT_EVENTHANDLER(SELF);
/* can't invoke on INTERP and can't return its result; this may not be
* the right interpreter */
if (e) {
void *unused;
unused = VTABLE_invoke(PMC_data_typed(e->interp, Parrot_Interp),
e->code, next);
UNUSED(unused);
}
return (opcode_t *)next;
}
/*
=back
=head2 Methods
=over 4
=cut
*/
/*
=item C<METHOD can_handle(PMC *event)>
Report whether the event handler can handle a particular type of event.
=cut
*/
METHOD can_handle(PMC *event) {
if (event->vtable->base_type == enum_class_Task) {
PMC * const type = VTABLE_get_attr_str(INTERP, event, CONST_STRING(INTERP, "type"));
STRING * const type_str = VTABLE_get_string(INTERP, type);
if (STRING_equal(INTERP, type_str, CONST_STRING(INTERP, "event"))) {
Parrot_EventHandler_attributes * const handler_struct = PARROT_EVENTHANDLER(SELF);
PMC * const subtype = VTABLE_get_attr_str(INTERP, event, CONST_STRING(INTERP, "subtype"));
STRING * const subtype_str = VTABLE_get_string(INTERP, subtype);
if (STRING_equal(INTERP, subtype_str, handler_struct->type)) {
RETURN(INTVAL 1);
}
}
}
RETURN(INTVAL 0);
}
}
/*
=back
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4:
*/