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1 | (* M2Lex.def provides a non tokenised lexical analyser. |
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 | DEFINITION MODULE M2Lex ; | |
22 | ||
23 | (* | |
24 | Title : M2Lex | |
25 | Author : Gaius Mulley | |
26 | Date : Date: Sat 16-09-1989 Time: 17:54:22.58 | |
27 | LastEdit : Date: Sat 16-09-1989 Time: 17:54:22.58 | |
28 | System : UNIX (GNU Modula-2) | |
29 | Description: Provides a non tokenised version of M2Lexical. | |
30 | Symbols are distinct MODULA-2 symbols. | |
31 | *) | |
32 | ||
33 | EXPORT QUALIFIED MaxLine, | |
34 | GetSymbol, | |
35 | PutSymbol, | |
36 | CurrentSymbol, | |
37 | LastSymbol, | |
38 | OpenSource, | |
39 | CloseSource, | |
40 | SymIs, | |
41 | IsSym, | |
42 | WriteError ; | |
43 | ||
44 | CONST | |
45 | MaxLine = 1024 ; | |
46 | ||
47 | VAR | |
48 | LastSymbol, | |
49 | CurrentSymbol : ARRAY [0..MaxLine] OF CHAR ; | |
50 | ||
51 | ||
52 | (* | |
53 | OpenSource - Attempts to open the source file, a. | |
54 | The success of the operation is returned. | |
55 | *) | |
56 | ||
57 | PROCEDURE OpenSource (a: ARRAY OF CHAR) : BOOLEAN ; | |
58 | ||
59 | ||
60 | (* | |
61 | CloseSource - Closes the current open file. | |
62 | *) | |
63 | ||
64 | PROCEDURE CloseSource ; | |
65 | ||
66 | ||
67 | (* | |
68 | SymIs - if Name is equal to the CurrentSymbol the next Symbol is read | |
69 | and true is returned, otherwise false is returned. | |
70 | *) | |
71 | ||
72 | PROCEDURE SymIs (Name: ARRAY OF CHAR) : BOOLEAN ; | |
73 | ||
74 | ||
75 | (* | |
76 | IsSym - returns the result of the comparison between CurrentSymbol | |
77 | and Name. | |
78 | *) | |
79 | ||
80 | PROCEDURE IsSym (Name: ARRAY OF CHAR) : BOOLEAN ; | |
81 | ||
82 | ||
83 | (* | |
84 | GetSymbol - gets the next Symbol into CurrentSymbol. | |
85 | *) | |
86 | ||
87 | PROCEDURE GetSymbol ; | |
88 | ||
89 | ||
90 | (* | |
91 | PutSymbol - pushes a symbol, Name, back onto the input. | |
92 | GetSymbol will set CurrentSymbol to, Name. | |
93 | *) | |
94 | ||
95 | PROCEDURE PutSymbol (Name: ARRAY OF CHAR) ; | |
96 | ||
97 | ||
98 | (* | |
99 | WriteError - displays the source line and points to the symbol in error. | |
100 | The message, a, is displayed. | |
101 | *) | |
102 | ||
103 | PROCEDURE WriteError (a: ARRAY OF CHAR) ; | |
104 | ||
105 | ||
106 | END M2Lex. |