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This version of Berkeley Yacc was taken from the BSD-Lite CD and targeted
to Java by
axel.schreiner@informatik.uni-osnabrueck.de
Makefile -> makefile removed Berkeleyisms, call it jay
defs.h eliminate -dlpr options, %union, output_file, #ident
eliminate sekeleton.c references
error.c eliminate %union
main.c eliminate -dlpr options, %union, output_file
output.c eliminate -dlpr options, %union, output_file
fix #define, short, -t/yyDebug
respell YYERRCODE, YYTABLESIZE, YYFINAL, YYMAXTOKEN
output trailer last
switch to filter behaviour
reader.c eliminate output_file, #ident
#line -> // line, pass //
yyvsp[] -> yyVals[yyTop], yyval -> yyVal
skeleton.c -> skeleton Java skeleton
test removed
yacc.1 -> jay.1 adapted
yyfix.* removed
Types: there is a significant difference. yacc uses %union to cast the value
stack and <tag> to select alternatives. This works for l- and r-values alike.
jay uses Object as the value stack and <tag> to set a class. l-values must not
be cast. $n should not be assigned to, but $$ usually is. $n is referenced,
but $$ usually is not. Consequently jay casts $n and $<tag>$ but not $<>n
and $$. This makes assignment to $n references to $$ kludgily possible.
As another kludge, to prevent 'untyped' messages and to avoid unnecessary
casts, casts to "Object" are not emitted.
-------------------------------------------------------------------------------
Berkeley Yacc is an LALR(1) parser generator. Berkeley Yacc has been made
as compatible as possible with AT&T Yacc. Berkeley Yacc can accept any input
specification that conforms to the AT&T Yacc documentation. Specifications
that take advantage of undocumented features of AT&T Yacc will probably be
rejected.
Berkeley Yacc is distributed with no warranty whatever. The code is certain
to contain errors. Neither the author nor any contributor takes responsibility
for any consequences of its use.
Berkeley Yacc is in the public domain. The data structures and algorithms
used in Berkeley Yacc are all either taken from documents available to the
general public or are inventions of the author. Anyone may freely distribute
source or binary forms of Berkeley Yacc whether unchanged or modified.
Distributers may charge whatever fees they can obtain for Berkeley Yacc.
Programs generated by Berkeley Yacc may be distributed freely.
Please report bugs to
robert.corbett@eng.Sun.COM
Include a small example if possible. Please include the banner string from
skeleton.c with the bug report. Do not expect rapid responses.
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