.\" Copyright (c) 1989 The Regents of the University of California.
.\" This code is derived from software contributed to Berkeley by
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.\" @(#)yacc.1 5.3 (Berkeley) %G%
yacc \- an LALR(1) parser generator
reads the grammar specification in the file
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.
normally writes the parse tables and the driver routine to the file
The following options are available:
option changes the prefix prepended to the output file names to
The default prefix is the character
The \fB-d\fR option causes the header file
will insert \#line directives in the generated code.
The \#line directives let the C compiler relate errors in the
generated code to the user's original code.
If the \fB-l\fR option is specified,
will not insert the \#line directives.
Any \#line directives specified by the user will be retained.
option will change the preprocessor directives generated by
so that debugging statements will be incorporated in the compiled code.
option causes a human-readable description of the generated parser to
If the environment variable TMPDIR is set, the string denoted by
TMPDIR will be used as the name of the directory where the temporary
The names of the tables generated by this version of
are ``yylhs'', ``yylen'', ``yydefred'', ``yydgoto'', ``yysindex'',
``yyrindex'', ``yygindex'', ``yytable'', and ``yycheck''.
Two additional tables, ``yyname'' and ``yyrule'', are created if
YYDEBUG is defined and non-zero.
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 number of conflicts is reported