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
|
/*
* Copyright (c) 2023 shifter <shifter@axoflow.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "filterx/expr-condition.h"
#include "filterx/object-primitive.h"
static FilterXConditional *
_tail_condition(FilterXConditional *c)
{
g_assert(c != NULL);
if (c->false_branch != NULL)
return _tail_condition(c->false_branch);
else
return c;
}
static FilterXObject *
_eval_condition(FilterXConditional *c)
{
FilterXObject *result = NULL;
FilterXObject *condition_value = NULL;
if (c->condition != FILTERX_CONDITIONAL_NO_CONDITION)
{
condition_value = filterx_expr_eval(c->condition);
if (!condition_value)
return NULL;
if (filterx_object_falsy(condition_value))
{
// no condition-expression match, no elif or else case
// returning true to avoid filterx failure on non matching if's
if (c->false_branch == NULL)
result = filterx_boolean_new(TRUE);
else
result = _eval_condition(c->false_branch);
goto exit;
}
}
if (!c->statements)
{
if (c->condition)
return condition_value;
// returning true to avoid filterx failure on empty else block
result = filterx_boolean_new(TRUE);
goto exit;
}
if (!filterx_expr_list_eval(c->statements, &result))
{
filterx_object_unref(result);
return filterx_boolean_new(FALSE);
}
exit:
filterx_object_unref(condition_value);
return result;
}
static void
_free (FilterXExpr *s)
{
FilterXConditional *self = (FilterXConditional *) s;
filterx_expr_unref(self->condition);
g_list_free_full(self->statements, (GDestroyNotify) filterx_expr_unref);
if (self->false_branch != NULL)
filterx_expr_unref(&self->false_branch->super);
filterx_expr_free_method(s);
}
static FilterXObject *
_eval(FilterXExpr *s)
{
FilterXConditional *self = (FilterXConditional *) s;
return _eval_condition(self);
}
FilterXExpr *
filterx_conditional_new_conditional_codeblock(FilterXExpr *condition, GList *stmts)
{
FilterXConditional *self = g_new0(FilterXConditional, 1);
filterx_expr_init_instance(&self->super);
self->super.eval = _eval;
self->super.free_fn = _free;
self->condition = condition;
self->statements = stmts;
return &self->super;
}
FilterXExpr *
filterx_conditional_new_codeblock(GList *stmts)
{
return filterx_conditional_new_conditional_codeblock(FILTERX_CONDITIONAL_NO_CONDITION, stmts);
}
FilterXExpr *
filterx_conditional_add_false_branch(FilterXConditional *s, FilterXConditional *false_branch)
{
g_assert(s != NULL);
FilterXConditional *last_condition = _tail_condition(s);
// avoid to create nested elses (if () {} else {} else {} else {})
g_assert(last_condition->condition);
last_condition->false_branch = false_branch;
return &s->super;
}
|
