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1eee94d3 GM |
1 | (* Output.mod redirect output. |
2 | ||
83ffe9cd | 3 | Copyright (C) 2021-2023 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 Output ; | |
23 | ||
24 | ||
25 | IMPORT FIO, SFIO ; | |
26 | FROM StrLib IMPORT StrEqual ; | |
27 | FROM NameKey IMPORT KeyToCharStar, Name ; | |
28 | FROM NumberIO IMPORT CardToStr ; | |
29 | FROM ASCII IMPORT nl ; | |
30 | ||
31 | FROM DynamicStrings IMPORT KillString, InitStringCharStar, ConCatChar, | |
32 | ConCat, InitString, Mark ; | |
33 | ||
34 | ||
35 | VAR | |
36 | stdout: BOOLEAN ; | |
37 | outputFile: FIO.File ; | |
38 | buffer : String ; | |
39 | ||
40 | ||
41 | (* | |
42 | Open - attempt to open filename as the output file. | |
43 | TRUE is returned if success, FALSE otherwise. | |
44 | *) | |
45 | ||
46 | PROCEDURE Open (filename: ARRAY OF CHAR) : BOOLEAN ; | |
47 | BEGIN | |
48 | IF StrEqual (filename, "<stdout>") OR StrEqual (filename, "-") | |
49 | THEN | |
50 | outputFile := FIO.StdOut ; | |
51 | stdout := TRUE ; | |
52 | RETURN TRUE | |
53 | ELSE | |
54 | outputFile := FIO.OpenToWrite (filename) ; | |
55 | stdout := FALSE ; | |
56 | RETURN FIO.IsNoError (outputFile) | |
57 | END | |
58 | END Open ; | |
59 | ||
60 | ||
61 | (* | |
62 | Close - close the output file. | |
63 | *) | |
64 | ||
65 | PROCEDURE Close ; | |
66 | BEGIN | |
67 | FIO.Close (outputFile) | |
68 | END Close ; | |
69 | ||
70 | ||
71 | (* | |
72 | Write - write a single character to the output file. | |
73 | *) | |
74 | ||
75 | PROCEDURE Write (ch: CHAR) ; | |
76 | BEGIN | |
77 | IF buffer = NIL | |
78 | THEN | |
79 | FIO.WriteChar (outputFile, ch) | |
80 | ELSE | |
81 | buffer := ConCatChar (buffer, ch) | |
82 | END | |
83 | END Write ; | |
84 | ||
85 | ||
86 | (* | |
87 | WriteString - write an unformatted string to the output. | |
88 | *) | |
89 | ||
90 | PROCEDURE WriteString (s: ARRAY OF CHAR) ; | |
91 | BEGIN | |
92 | IF buffer = NIL | |
93 | THEN | |
94 | FIO.WriteString (outputFile, s) | |
95 | ELSE | |
96 | buffer := ConCat (buffer, Mark (InitString (s))) | |
97 | END | |
98 | END WriteString ; | |
99 | ||
100 | ||
101 | (* | |
102 | KillWriteS - write a string to the output and free the string afterwards. | |
103 | *) | |
104 | ||
105 | PROCEDURE KillWriteS (s: String) ; | |
106 | BEGIN | |
107 | IF KillString (SFIO.WriteS (outputFile, s)) = NIL | |
108 | THEN | |
109 | END | |
110 | END KillWriteS ; | |
111 | ||
112 | ||
113 | (* | |
114 | WriteS - write a string to the output. The string is not freed. | |
115 | *) | |
116 | ||
117 | PROCEDURE WriteS (s: String) ; | |
118 | BEGIN | |
119 | IF SFIO.WriteS (outputFile, s) = s | |
120 | THEN | |
121 | END | |
122 | END WriteS ; | |
123 | ||
124 | ||
125 | (* | |
126 | WriteKey - write a key to the output. | |
127 | *) | |
128 | ||
129 | PROCEDURE WriteKey (key: Name) ; | |
130 | BEGIN | |
131 | IF buffer = NIL | |
132 | THEN | |
133 | KillWriteS (InitStringCharStar (KeyToCharStar (key))) | |
134 | ELSE | |
135 | buffer := ConCat (buffer, Mark (InitStringCharStar (KeyToCharStar (key)))) | |
136 | END | |
137 | END WriteKey ; | |
138 | ||
139 | ||
140 | (* | |
141 | WriteLn - write a newline to the output. | |
142 | *) | |
143 | ||
144 | PROCEDURE WriteLn ; | |
145 | BEGIN | |
146 | IF buffer = NIL | |
147 | THEN | |
148 | FIO.WriteLine (outputFile) | |
149 | ELSE | |
150 | Write (nl) | |
151 | END | |
152 | END WriteLn ; | |
153 | ||
154 | ||
155 | (* | |
156 | WriteCard - write a cardinal using fieldlength characters. | |
157 | *) | |
158 | ||
159 | PROCEDURE WriteCard (card, fieldlength: CARDINAL) ; | |
160 | VAR | |
161 | s: ARRAY [0..20] OF CHAR ; | |
162 | BEGIN | |
163 | CardToStr (card, fieldlength, s) ; | |
164 | WriteString (s) | |
165 | END WriteCard ; | |
166 | ||
167 | ||
168 | (* | |
169 | StartBuffer - create a buffer into which any output is redirected. | |
170 | *) | |
171 | ||
172 | PROCEDURE StartBuffer ; | |
173 | BEGIN | |
174 | IF buffer # NIL | |
175 | THEN | |
176 | buffer := KillString (buffer) | |
177 | END ; | |
178 | buffer := InitString ('') | |
179 | END StartBuffer ; | |
180 | ||
181 | ||
182 | (* | |
183 | EndBuffer - end the redirection and return the contents of the buffer. | |
184 | *) | |
185 | ||
186 | PROCEDURE EndBuffer () : String ; | |
187 | VAR | |
188 | s: String ; | |
189 | BEGIN | |
190 | s := buffer ; | |
191 | buffer := NIL ; | |
192 | RETURN s | |
193 | END EndBuffer ; | |
194 | ||
195 | ||
196 | BEGIN | |
197 | stdout := TRUE ; | |
198 | buffer := NIL ; | |
199 | outputFile := FIO.StdOut ; | |
200 | END Output. |