NAME

       pyacc - Pascal Yacc compiler compiler.

USAGE

       yacc [options] yacc-file[.y] [output-file[.pas]]

       SH OPTIONS

       -v     Verbose:  Pascal  Yacc  generates a readable description of the generated parser, written to yacc-
              file with new extension .lst.

       -d     Debug: TP Yacc generates a parser with debugging output.

DESCRIPTION

       TP Yacc is a program that lets you prepare parsers from the description of input  languages  by  BNF-like
       grammars.  You  simply specify the grammar for your target language, augmented with the Turbo Pascal code
       necessary to process the syntactic constructs, and TP Yacc translates your grammar into the Turbo  Pascal
       code for a corresponding parser subroutine named yyparse.

       TP  Yacc  parses  the  source  grammar  contained  in  yacc-file  (with default suffix .y) and writes the
       constructed parser subroutine to the specified output-file (with default suffix .pas); if no output  file
       is  specified, output goes to yacc-file with new suffix .pas. If any errors are found during compilation,
       error messages are written to the list file (yacc-file with new suffix .lst).

       The generated parser routine, yyparse, is declared as:

          function yyparse : Integer;

       This routine may be called by your main program to execute the parser.  The return value of  the  yyparse
       routine  denotes success or failure of the parser (possible return values: 0 = success, 1 = unrecoverable
       syntax error or parse stack overflow).

       Similar to TP Lex, the code template for the yyparse routine may be found in the  yyparse.cod  file.  The
       rules for locating this file are analogous to those of TP Lex (see Section `TP Lex').

       The  TP  Yacc  library  (YaccLib)  unit  is  required by programs using Yacc- generated parsers; you will
       therefore have to put an appropriate uses clause into your program  or  unit  that  contains  the  parser
       routine.  The  YaccLib  unit  also provides some routines which may be used to control the actions of the
       parser. See the file yacclib.pas for further information.

More information

       For more information, see the documentation that comes with TP lex and yacc.

AUTHOR

       Albert Graeff (<ag@muwiinfa.geschichte.uni-mainz.de>, <Dr.Graef@t-online.de>)

SEE ALSO

       ppc386(1) plex(1)