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