yacc



YACC(1)                   BSD General Commands Manual                  YACC(1)


NAME

     yacc - an LALR(1) parser generator


SYNOPSIS

     yacc [-dlrtv] [-b file_prefix] [-o output_filename] [-p symbol_prefix]
          filename


DESCRIPTION

     Yacc reads the grammar specification in the file filename and generates
     an LR(1) parser for it.  The parsers consist of a set of LALR(1) parsing
     tables and a driver routine written in the C programming language.  Yacc
     normally writes the parse tables and the driver routine to the file
     y.tab.c.

     The following options are available:

     -b file_prefix
             Change the prefix prepended to the output file names to the
             string denoted by file_prefix.  The default prefix is the charac-
             ter y.

     -d      Cause the header file y.tab.h to be written.

     -l      If the -l option is not specified, yacc will insert #line direc-
             tives in the generated code.  The #line directives let the C com-
             piler relate errors in the generated code to the user’s original
             code.  If the -l option is specified, yacc will not insert the
             #line directives.  Any #line directives specified by the user
             will be retained.

     -o output_filename
             Cause yacc to write the generated code to output_filename instead
             of the default file, y.tab.c.

     -p symbol_prefix
             Change the prefix prepended to yacc-generated symbols to the
             string denoted by symbol_prefix.  The default prefix is the
             string yy.

     -r      Cause yacc to produce separate files for code and tables.  The
             code file is named y.code.c, and the tables file is named
             y.tab.c.

     -t      Change the preprocessor directives generated by yacc so that
             debugging statements will be incorporated in the compiled code.

     -v      Cause a human-readable description of the generated parser to be
             written to the file y.output.

     If the environment variable TMPDIR is set, the string denoted by TMPDIR
     will be used as the name of the directory where the temporary files are
     created.


FILES

     y.code.c
     y.tab.c
     y.tab.h
     y.output
     /tmp/yacc.aXXXXXXXXXX
     /tmp/yacc.tXXXXXXXXXX
     /tmp/yacc.uXXXXXXXXXX


DIAGNOSTICS

     If there are rules that are never reduced, the number of such rules is
     reported on standard error.  If there are any LALR(1) conflicts, the num-
     ber of conflicts is reported on standard error.

BSD                              May 24, 1993                              BSD

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