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
|
/* valaconstant.vala
*
* Copyright (C) 2006-2009 Jürg Billeter
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Author:
* Jürg Billeter <j@bitron.ch>
*/
using GLib;
/**
* Represents a type member with a constant value.
*/
public class Vala.Constant : Member, Lockable {
/**
* The data type of this constant.
*/
public DataType type_reference {
get { return _data_type; }
set {
_data_type = value;
_data_type.parent_node = this;
}
}
/**
* The value of this constant.
*/
public Expression? initializer {
get { return _initializer; }
set {
_initializer = value;
if (_initializer != null) {
_initializer.parent_node = this;
}
}
}
private string cname;
private bool lock_used = false;
private DataType _data_type;
private Expression _initializer;
/**
* Creates a new constant.
*
* @param name constant name
* @param type_reference constant type
* @param initializer constant value
* @param source_reference reference to source code
* @return newly created constant
*/
public Constant (string name, DataType type_reference, Expression? initializer, SourceReference? source_reference) {
base (name, source_reference);
this.type_reference = type_reference;
this.initializer = initializer;
}
public override void accept (CodeVisitor visitor) {
visitor.visit_member (this);
visitor.visit_constant (this);
}
public override void accept_children (CodeVisitor visitor) {
type_reference.accept (visitor);
if (initializer != null) {
initializer.accept (visitor);
}
}
/**
* Returns the name of this constant as it is used in C code.
*
* @return the name to be used in C code
*/
public string get_cname () {
if (cname == null) {
cname = get_default_cname ();
}
return cname;
}
/**
* Returns the default name of this constant as it is used in C
* code.
*
* @return the name to be used in C code by default
*/
public string get_default_cname () {
if (parent_symbol == null) {
// global constant
return name;
} else {
return "%s%s".printf (parent_symbol.get_lower_case_cprefix ().up (), name);
}
}
public bool get_lock_used () {
return lock_used;
}
public void set_lock_used (bool used) {
lock_used = used;
}
public override void replace_type (DataType old_type, DataType new_type) {
if (type_reference == old_type) {
type_reference = new_type;
}
}
private void process_ccode_attribute (Attribute a) {
if (a.has_argument ("cname")) {
cname = a.get_string ("cname");
}
if (a.has_argument ("cheader_filename")) {
var val = a.get_string ("cheader_filename");
foreach (string filename in val.split (",")) {
add_cheader_filename (filename);
}
}
}
/**
* Process all associated attributes.
*/
public void process_attributes () {
foreach (Attribute a in attributes) {
if (a.name == "CCode") {
process_ccode_attribute (a);
}
}
}
public override bool check (SemanticAnalyzer analyzer) {
if (checked) {
return !error;
}
checked = true;
process_attributes ();
var old_source_file = analyzer.current_source_file;
var old_symbol = analyzer.current_symbol;
if (source_reference != null) {
analyzer.current_source_file = source_reference.file;
}
analyzer.current_symbol = this;
type_reference.check (analyzer);
if (!external_package) {
if (initializer == null) {
error = true;
Report.error (source_reference, "A const field requires a initializer to be provided");
} else {
initializer.target_type = type_reference;
initializer.check (analyzer);
}
}
analyzer.current_source_file = old_source_file;
analyzer.current_symbol = old_symbol;
return !error;
}
}
|
