Return to eyacc.1 CVS log

Up to [CSRG BSD Unix] / 43BSDReno / pgrm / pascal / eyacc

BSD 4.3reno

.\" Copyright (c) 1980, 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms are permitted provided
.\" that: (1) source distributions retain this entire copyright notice and
.\" comment, and (2) distributions including binaries display the following
.\" acknowledgement:  ``This product includes software developed by the
.\" University of California, Berkeley and its contributors'' in the
.\" documentation or other materials provided with the distribution and in
.\" all advertising materials mentioning features or use of this software.
.\" Neither the name of the University nor the names of its contributors may
.\" be used to endorse or promote products derived from this software without
.\" specific prior written permission.
.\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
.\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
.\"
.\"     @(#)eyacc.1	6.4 (Berkeley) 7/24/90
.\"
.Dd July 24, 1990
.Dt EYACC 1
.Os BSD 4
.Sh NAME
.Nm eyacc
.Nd modified yacc allowing much improved error recovery
.Sh SYNOPSIS
.Nm eyacc
.Op Fl v
.Op Ar grammar
.Sh DESCRIPTION
.Nm Eyacc
is an old version of
.Xr yacc  1  ,
which produces tables used by the Pascal system and its error recovery
routines.
.Nm Eyacc
fully enumerates test actions in its parser when an error token
is in the look-ahead set.
This prevents the parser from making undesirable reductions
when an error occurs before the error is detected.
The table format is different in
.Nm eyacc
than it was in the old
.Xr yacc 1 ,
as minor changes had been made for efficiency reasons.
.Sh SEE ALSO
.Xr yacc 1
.br
.Em Practical LR Error Recovery
by Susan L.  Graham, Charles B. Haley and W. N. Joy;
SIGPLAN Conference on Compiler Construction,
August 1979.
.Sh HISTORY
.Nm Eyacc
appeared in 4.0 BSD.
.Sh AUTHORS
S. C. Johnson
.br
.Nm Eyacc
modifications by Charles Haley and William Joy.
.Sh BUGS
.Xr Pc 1
and its error recovery routines should be made into a library
of routines for the new
.Xr yacc 1 .

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.