1/* valaintegertype.vala
2 *
3 * Copyright (C) 2008-2009  Jürg Billeter
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Lesser General Public License for more details.
14
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
18 *
19 * Author:
20 * 	Jürg Billeter <j@bitron.ch>
21 */
22
23using GLib;
24
25/**
26 * An integer type.
27 */
28public class Vala.IntegerType : ValueType {
29	string? literal_value;
30	string? literal_type_name;
31
32	public IntegerType (Struct type_symbol, string? literal_value = null, string? literal_type_name = null) {
33		base (type_symbol);
34		this.literal_value = literal_value;
35		this.literal_type_name = literal_type_name;
36	}
37
38	public override DataType copy () {
39		var result = new IntegerType ((Struct) type_symbol, literal_value, literal_type_name);
40		result.source_reference = source_reference;
41		result.value_owned = value_owned;
42		result.nullable = nullable;
43		return result;
44	}
45
46	public override bool compatible (DataType target_type) {
47		if (target_type.type_symbol is Struct && literal_type_name == "int") {
48			// int literals are implicitly convertible to integer types
49			// of a lower rank if the value of the literal is within
50			// the range of the target type
51			var target_st = (Struct) target_type.type_symbol;
52			if (target_st.is_integer_type ()) {
53				var int_attr = target_st.get_attribute ("IntegerType");
54				if (int_attr != null && int_attr.has_argument ("min") && int_attr.has_argument ("max")) {
55					int val = int.parse (literal_value);
56					return (val >= int_attr.get_integer ("min") && val <= int_attr.get_integer ("max"));
57				} else {
58					// assume to be compatible if the target type doesn't specify limits
59					return true;
60				}
61			}
62		} else if (target_type.type_symbol is Enum && (literal_type_name == "int" || literal_type_name == "uint")) {
63			// allow implicit conversion from 0 to enum and flags types
64			if (int.parse (literal_value) == 0) {
65				return true;
66			}
67		}
68
69		return base.compatible (target_type);
70	}
71}
72