projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 5c7ea48e KM |
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 | .\" | |
| 8bb8cf58 | 5 | .\" @(#)eyacc.1 6.1 (Berkeley) %G% |
| 5c7ea48e | 6 | .\" |
| 8bb8cf58 | 7 | .TH EYACC 1 "%G%" |
| 5c7ea48e KM |
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. |