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| 1eee94d3 GM |
1 | (* Scan.def Provides a primitive symbol fetching from input. |
| 2 | ||
| a945c346 | 3 | Copyright (C) 2001-2024 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 | DEFINITION MODULE Scan ; | |
| 28 | ||
| 29 | (* Provides a primitive symbol fetching from input. | |
| 30 | Symbols are delimited by spaces and tabs. | |
| 31 | Limitation only allows one source file at | |
| 32 | a time to deliver symbols. *) | |
| 33 | ||
| 34 | ||
| 35 | EXPORT QUALIFIED GetNextSymbol, WriteError, | |
| 36 | OpenSource, CloseSource, | |
| 37 | TerminateOnError, DefineComments ; | |
| 38 | ||
| 39 | ||
| 40 | (* OpenSource - opens a source file for reading. *) | |
| 41 | ||
| 42 | PROCEDURE OpenSource (a: ARRAY OF CHAR) : BOOLEAN ; | |
| 43 | ||
| 44 | ||
| 45 | (* CloseSource - closes the current source file from reading. *) | |
| 46 | ||
| 47 | PROCEDURE CloseSource ; | |
| 48 | ||
| 49 | ||
| 50 | (* GetNextSymbol gets the next source symbol and returns it in a. *) | |
| 51 | ||
| 52 | PROCEDURE GetNextSymbol (VAR a: ARRAY OF CHAR) ; | |
| 53 | ||
| 54 | ||
| 55 | (* WriteError writes a message, a, under the source line, which *) | |
| 56 | (* attempts to pinpoint the Symbol at fault. *) | |
| 57 | ||
| 58 | PROCEDURE WriteError (a: ARRAY OF CHAR) ; | |
| 59 | ||
| 60 | ||
| 61 | (* | |
| 62 | TerminateOnError - exits with status 1 if we call WriteError. | |
| 63 | *) | |
| 64 | ||
| 65 | PROCEDURE TerminateOnError ; | |
| 66 | ||
| 67 | ||
| 68 | (* | |
| 69 | DefineComments - defines the start of comments within the source | |
| 70 | file. | |
| 71 | ||
| 72 | The characters in Start define the comment start | |
| 73 | and characters in End define the end. | |
| 74 | The BOOLEAN eoln determine whether the comment | |
| 75 | is terminated by end of line. If eoln is TRUE | |
| 76 | then End is ignored. | |
| 77 | ||
| 78 | If this procedure is never called then no comments | |
| 79 | are allowed. | |
| 80 | *) | |
| 81 | ||
| 82 | PROCEDURE DefineComments (Start, End: ARRAY OF CHAR; eoln: BOOLEAN) ; | |
| 83 | ||
| 84 | ||
| 85 | END Scan. |