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(* M2Lex.def provides a non tokenised lexical analyser.
Copyright (C) 2001-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Modula-2; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. *)
DEFINITION MODULE M2Lex ;
(*
Title : M2Lex
Author : Gaius Mulley
Date : Date: Sat 16-09-1989 Time: 17:54:22.58
LastEdit : Date: Sat 16-09-1989 Time: 17:54:22.58
System : UNIX (GNU Modula-2)
Description: Provides a non tokenised version of M2Lexical.
Symbols are distinct MODULA-2 symbols.
*)
EXPORT QUALIFIED MaxLine,
GetSymbol,
PutSymbol,
CurrentSymbol,
LastSymbol,
OpenSource,
CloseSource,
SymIs,
IsSym,
WriteError ;
CONST
MaxLine = 1024 ;
VAR
LastSymbol,
CurrentSymbol : ARRAY [0..MaxLine] OF CHAR ;
(*
OpenSource - Attempts to open the source file, a.
The success of the operation is returned.
*)
PROCEDURE OpenSource (a: ARRAY OF CHAR) : BOOLEAN ;
(*
CloseSource - Closes the current open file.
*)
PROCEDURE CloseSource ;
(*
SymIs - if Name is equal to the CurrentSymbol the next Symbol is read
and true is returned, otherwise false is returned.
*)
PROCEDURE SymIs (Name: ARRAY OF CHAR) : BOOLEAN ;
(*
IsSym - returns the result of the comparison between CurrentSymbol
and Name.
*)
PROCEDURE IsSym (Name: ARRAY OF CHAR) : BOOLEAN ;
(*
GetSymbol - gets the next Symbol into CurrentSymbol.
*)
PROCEDURE GetSymbol ;
(*
PutSymbol - pushes a symbol, Name, back onto the input.
GetSymbol will set CurrentSymbol to, Name.
*)
PROCEDURE PutSymbol (Name: ARRAY OF CHAR) ;
(*
WriteError - displays the source line and points to the symbol in error.
The message, a, is displayed.
*)
PROCEDURE WriteError (a: ARRAY OF CHAR) ;
END M2Lex.
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