]>
Commit | Line | Data |
---|---|---|
1eee94d3 GM |
1 | (* SCmdArgs.mod provides procedures to retrieve arguments from strings. |
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 | Under Section 7 of GPL version 3, you are granted additional | |
19 | permissions described in the GCC Runtime Library Exception, version | |
20 | 3.1, as published by the Free Software Foundation. | |
21 | ||
22 | You should have received a copy of the GNU General Public License and | |
23 | a copy of the GCC Runtime Library Exception along with this program; | |
24 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
25 | <http://www.gnu.org/licenses/>. *) | |
26 | ||
27 | IMPLEMENTATION MODULE SCmdArgs ; | |
28 | ||
29 | FROM ASCII IMPORT cr, nul ; | |
30 | FROM DynamicStrings IMPORT Length, Slice, char ; | |
31 | ||
32 | CONST | |
33 | esc = '\' ; | |
34 | space = ' ' ; | |
35 | squote = "'" ; | |
36 | dquote = '"' ; | |
37 | tab = ' ' ; | |
38 | ||
39 | ||
40 | (* | |
41 | isWhite - | |
42 | *) | |
43 | ||
44 | PROCEDURE isWhite (ch: CHAR) : BOOLEAN ; | |
45 | BEGIN | |
46 | RETURN (ch=space) OR (ch=tab) | |
47 | END isWhite ; | |
48 | ||
49 | ||
50 | (* | |
51 | skipWhite - | |
52 | *) | |
53 | ||
54 | PROCEDURE skipWhite (s: String; i, e: INTEGER) : INTEGER ; | |
55 | VAR | |
56 | ch: CHAR ; | |
57 | BEGIN | |
58 | WHILE i<e DO | |
59 | ch := char(s, i) ; | |
60 | IF isWhite(ch) | |
61 | THEN | |
62 | INC(i) | |
63 | ELSE | |
64 | RETURN( i ) | |
65 | END | |
66 | END ; | |
67 | RETURN( i ) | |
68 | END skipWhite ; | |
69 | ||
70 | ||
71 | (* | |
72 | skipOverWhite - | |
73 | *) | |
74 | ||
75 | PROCEDURE skipOverWhite (s: String; start, end: INTEGER) : INTEGER ; | |
76 | BEGIN | |
77 | INC(start) ; | |
78 | WHILE (start<end) AND (NOT isWhite(char(s, start))) DO | |
79 | INC(start) | |
80 | END ; | |
81 | RETURN( start ) | |
82 | END skipOverWhite ; | |
83 | ||
84 | ||
85 | (* | |
86 | skipOver - | |
87 | *) | |
88 | ||
89 | PROCEDURE skipOver (s: String; start, end: INTEGER; ch: CHAR) : INTEGER ; | |
90 | BEGIN | |
91 | INC(start) ; | |
92 | WHILE (start<end) AND (char(s, start)#ch) DO | |
93 | INC(start) | |
94 | END ; | |
95 | RETURN( start ) | |
96 | END skipOver ; | |
97 | ||
98 | ||
99 | (* | |
100 | skipNextArg - | |
101 | *) | |
102 | ||
103 | PROCEDURE skipNextArg (s: String; start, end: INTEGER) : INTEGER ; | |
104 | VAR | |
105 | ch: CHAR ; | |
106 | BEGIN | |
107 | IF start<end | |
108 | THEN | |
109 | ch := char(s, start) ; | |
110 | IF ch=dquote | |
111 | THEN | |
112 | end := skipOver(s, start, end, dquote) | |
113 | ELSIF ch=squote | |
114 | THEN | |
115 | end := skipOver(s, start, end, squote) | |
116 | ELSE | |
117 | end := skipOverWhite(s, start, end) | |
118 | END | |
119 | END ; | |
120 | RETURN( end ) | |
121 | END skipNextArg ; | |
122 | ||
123 | ||
124 | (* | |
125 | GetArg - takes a command line and attempts to extract argument, n, | |
126 | from CmdLine. The resulting argument is placed into, a. | |
127 | The result of the operation is returned. | |
128 | *) | |
129 | ||
130 | PROCEDURE GetArg (CmdLine: String; | |
131 | n: CARDINAL; VAR Argi: String) : BOOLEAN ; | |
132 | VAR | |
133 | i : CARDINAL ; | |
134 | sn, | |
135 | start, end: INTEGER ; | |
136 | ch : CHAR ; | |
137 | BEGIN | |
138 | i := 0 ; | |
139 | start := 0 ; | |
140 | end := Length(CmdLine) ; | |
141 | WHILE i<n DO | |
142 | start := skipWhite(CmdLine, start, end) ; | |
143 | sn := skipNextArg(CmdLine, start, end) ; | |
144 | IF sn<end | |
145 | THEN | |
146 | start := sn ; | |
147 | INC(i) | |
148 | ELSE | |
149 | RETURN( FALSE ) | |
150 | END | |
151 | END ; | |
152 | start := skipWhite(CmdLine, start, end) ; | |
153 | sn := skipNextArg(CmdLine, start, end) ; | |
154 | Argi := Slice(CmdLine, start, sn) ; | |
155 | RETURN( TRUE ) | |
156 | END GetArg ; | |
157 | ||
158 | ||
159 | (* | |
160 | Narg - returns the number of arguments available from | |
161 | command line, CmdLine. | |
162 | *) | |
163 | ||
164 | PROCEDURE Narg (CmdLine: String) : CARDINAL ; | |
165 | VAR | |
166 | n : CARDINAL ; | |
167 | s, | |
168 | start, end: INTEGER ; | |
169 | BEGIN | |
170 | n := 0 ; | |
171 | start := 0 ; | |
172 | end := Length(CmdLine) ; | |
173 | LOOP | |
174 | start := skipWhite(CmdLine, start, end) ; | |
175 | s := skipNextArg(CmdLine, start, end) ; | |
176 | IF s<end | |
177 | THEN | |
178 | start := s ; | |
179 | INC(n) | |
180 | ELSE | |
181 | RETURN( n ) | |
182 | END | |
183 | END | |
184 | END Narg ; | |
185 | ||
186 | ||
187 | PROCEDURE Escape (ch: CHAR) : BOOLEAN ; | |
188 | BEGIN | |
189 | RETURN( ch=esc ) | |
190 | END Escape ; | |
191 | ||
192 | ||
193 | PROCEDURE Space (ch: CHAR) : BOOLEAN ; | |
194 | BEGIN | |
195 | RETURN( (ch=space) OR (ch=tab) ) | |
196 | END Space ; | |
197 | ||
198 | ||
199 | PROCEDURE DoubleQuote (ch: CHAR) : BOOLEAN ; | |
200 | BEGIN | |
201 | RETURN( ch=dquote ) | |
202 | END DoubleQuote ; | |
203 | ||
204 | ||
205 | PROCEDURE SingleQuote (ch: CHAR) : BOOLEAN ; | |
206 | BEGIN | |
207 | RETURN( ch=squote ) | |
208 | END SingleQuote ; | |
209 | ||
210 | ||
211 | END SCmdArgs. |