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1eee94d3 GM |
1 | (* FifoQueue.mod provides a simple fifo queue. |
2 | ||
83ffe9cd | 3 | Copyright (C) 2001-2023 Free Software Foundation, Inc. |
1eee94d3 GM |
4 | Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>. |
5 | ||
6 | This file is part of GNU Modula-2. | |
7 | ||
8 | GNU Modula-2 is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 3, or (at your option) | |
11 | any later version. | |
12 | ||
13 | GNU Modula-2 is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with GNU Modula-2; see the file COPYING3. If not see | |
20 | <http://www.gnu.org/licenses/>. *) | |
21 | ||
22 | IMPLEMENTATION MODULE FifoQueue ; | |
23 | ||
24 | FROM Lists IMPORT List, InitList, PutItemIntoList, GetItemFromList ; | |
25 | ||
26 | TYPE | |
27 | Fifo = RECORD | |
28 | Queue: List ; | |
29 | Out : CARDINAL ; | |
30 | END ; | |
31 | ||
32 | VAR | |
33 | const, | |
34 | subrange, | |
35 | enumeration, | |
36 | constructor: Fifo ; | |
37 | ||
38 | ||
39 | (* | |
40 | PutInto - places a CARDINAL number, c, into a fifo queue. | |
41 | *) | |
42 | ||
43 | PROCEDURE PutInto (VAR f: Fifo; c: CARDINAL) ; | |
44 | BEGIN | |
45 | WITH f DO | |
46 | PutItemIntoList(Queue, c) | |
47 | END | |
48 | END PutInto ; | |
49 | ||
50 | ||
51 | (* | |
52 | GetFrom - retrieves a CARDINAL number, c, from a fifo queue. | |
53 | *) | |
54 | ||
55 | PROCEDURE GetFrom (VAR f: Fifo; VAR c: CARDINAL) ; | |
56 | BEGIN | |
57 | WITH f DO | |
58 | INC(Out) ; | |
59 | c := GetItemFromList(Queue, Out) | |
60 | END | |
61 | END GetFrom ; | |
62 | ||
63 | ||
64 | (* | |
65 | PutEnumerationIntoFifoQueue - places an enumeration symbol, c, | |
66 | into a fifo queue. | |
67 | *) | |
68 | ||
69 | PROCEDURE PutEnumerationIntoFifoQueue (c: CARDINAL) ; | |
70 | BEGIN | |
71 | PutInto(enumeration, c) | |
72 | END PutEnumerationIntoFifoQueue ; | |
73 | ||
74 | ||
75 | (* | |
76 | GetEnumerationFromFifoQueue - retrieves an enumeration symbol, | |
77 | c, from a fifo queue. | |
78 | *) | |
79 | ||
80 | PROCEDURE GetEnumerationFromFifoQueue (VAR c: CARDINAL) ; | |
81 | BEGIN | |
82 | GetFrom(enumeration, c) | |
83 | END GetEnumerationFromFifoQueue ; | |
84 | ||
85 | ||
86 | (* | |
87 | PutSubrangeIntoFifoQueue - places a subrange symbol into a fifo | |
88 | queue. | |
89 | *) | |
90 | ||
91 | PROCEDURE PutSubrangeIntoFifoQueue (c: CARDINAL) ; | |
92 | BEGIN | |
93 | PutInto(subrange, c) | |
94 | END PutSubrangeIntoFifoQueue ; | |
95 | ||
96 | ||
97 | (* | |
98 | GetSubrangeFromFifoQueue - retrieves a subrange symbol from a | |
99 | fifo queue. | |
100 | *) | |
101 | ||
102 | PROCEDURE GetSubrangeFromFifoQueue (VAR c: CARDINAL) ; | |
103 | BEGIN | |
104 | GetFrom(subrange, c) | |
105 | END GetSubrangeFromFifoQueue ; | |
106 | ||
107 | ||
108 | (* | |
109 | PutConstructorIntoFifoQueue - places a constructor symbol | |
110 | into a fifo queue. | |
111 | *) | |
112 | ||
113 | PROCEDURE PutConstructorIntoFifoQueue (c: CARDINAL) ; | |
114 | BEGIN | |
115 | PutInto(constructor, c) | |
116 | END PutConstructorIntoFifoQueue ; | |
117 | ||
118 | ||
119 | (* | |
120 | GetConstructorFromFifoQueue - retrieves a constructor symbol | |
121 | from a fifo queue. | |
122 | *) | |
123 | ||
124 | PROCEDURE GetConstructorFromFifoQueue (VAR c: CARDINAL) ; | |
125 | BEGIN | |
126 | GetFrom(constructor, c) | |
127 | END GetConstructorFromFifoQueue ; | |
128 | ||
129 | ||
130 | (* | |
131 | PutConstIntoFifoQueue - places a constant symbol | |
132 | into a fifo queue. | |
133 | *) | |
134 | ||
135 | PROCEDURE PutConstIntoFifoQueue (c: CARDINAL) ; | |
136 | BEGIN | |
137 | PutInto(const, c) | |
138 | END PutConstIntoFifoQueue ; | |
139 | ||
140 | ||
141 | (* | |
142 | GetConstFromFifoQueue - retrieves a const symbol | |
143 | from a fifo queue. | |
144 | *) | |
145 | ||
146 | PROCEDURE GetConstFromFifoQueue (VAR c: CARDINAL) ; | |
147 | BEGIN | |
148 | GetFrom(const, c) | |
149 | END GetConstFromFifoQueue ; | |
150 | ||
151 | ||
152 | (* | |
153 | Init - initialize the fifo queue. | |
154 | *) | |
155 | ||
156 | PROCEDURE Init (VAR f: Fifo) ; | |
157 | BEGIN | |
158 | WITH f DO | |
159 | InitList(Queue) ; | |
160 | Out := 0 | |
161 | END | |
162 | END Init ; | |
163 | ||
164 | ||
165 | BEGIN | |
166 | Init(const) ; | |
167 | Init(enumeration) ; | |
168 | Init(subrange) ; | |
169 | Init(constructor) | |
170 | END FifoQueue. |