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Annotation of 43BSD/ucb/pascal/eyacc/eyacc.1, revision 1.1.1.1

1.1       root        1: .\" Copyright (c) 1980 Regents of the University of California.
                      2: .\" All rights reserved.  The Berkeley software License Agreement
                      3: .\" specifies the terms and conditions for redistribution.
                      4: .\"
                      5: .\"    @(#)eyacc.1     6.1 (Berkeley) 4/29/85
                      6: .\"
                      7: .TH EYACC 1 "4/29/85"
                      8: .UC 4
                      9: .SH NAME
                     10: eyacc \- modified yacc allowing much improved error recovery
                     11: .SH SYNOPSIS
                     12: .B eyacc
                     13: [
                     14: .B \-v
                     15: ]
                     16: [ grammar ]
                     17: .SH DESCRIPTION
                     18: .I Eyacc
                     19: is an old version of
                     20: .IR yacc (1),
                     21: which produces tables used by the Pascal system and its error recovery
                     22: routines.
                     23: .I Eyacc
                     24: fully enumerates test actions in its parser when an error token
                     25: is in the look-ahead set.
                     26: This prevents the parser from making undesirable reductions
                     27: when an error occurs before the error is detected.
                     28: The table format is different in
                     29: .I eyacc
                     30: than it was in the old
                     31: .I yacc,
                     32: as minor changes had been made for efficiency reasons.
                     33: .SH "SEE ALSO"
                     34: yacc(1)
                     35: .br
                     36: ``Practical LR Error Recovery'' by Susan L. Graham, Charles B. Haley
                     37: and W. N. Joy; SIGPLAN Conference on Compiler Construction, August 1979.
                     38: .SH AUTHOR
                     39: S. C. Johnson
                     40: .PP
                     41: .I Eyacc
                     42: modifications by Charles Haley and William Joy.
                     43: .SH BUGS
                     44: .I Pc
                     45: and its error recovery routines should be made into a library
                     46: of routines for the new
                     47: .I yacc.

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