From: Tanaka Akira <akr@...17n.org>
Date: 2002-06-25T13:23:11+09:00
Subject: [ruby-dev:17580] Re: Ruby grammar

In article <1024929830.978899.13594.nullmailer@picachu.netlab.jp>,
  matz@ruby-lang.org (Yukihiro Matsumoto) writes:

> $BJ#?t$N%V%m%C%/$,$I$3$KIU$/$N$+LB$&$h$j$O%(%i!<$K$7$?J}$,NI$$(B
> $B$H;W$C$?$+$i$G$9!#$?$H$($P!"M}O@E*$K$O(B
> 
> |m1 m2 1 {} {} $B$H$$$&$h$&$J(B {} $B$N%M%9%H$b2DG=$G!"(B
> 
> $B$H$$$&$h$&$J%1!<%9$O(B
> 
>   m1(m2(1){}){}
> 
> $B$H2r<a$9$k$3$H$O2DG=$G$7$g$&$,!"$3$N%3!<%I$rL\$K$7$?$H$-$N%f!<(B
> $B%6$NEvOG$N%3%9%H$OBg$-$9$.$k$h$&$K;W$$$^$9!#(B

$B$?$7$+$K!#%V%m%C%/$NCf?H$,C;$1$l$PLdBj$J$$$s$G$7$g$&$,!"D9$/$J$k$K$D$l(B
$B$FGD0.:$Fq$K$J$j$=$&$G$O$"$j$^$9!#(B

> |  m 1 do end.a do end
> |  m 1 do end.a {}
> |
> |$B$O(B parse error $B$K$O$7$?$/$J$$(B?
> 
> $B$A$g$C$HA0$J$i!V$=$&$G$9!W$HEz$($?$@$m$&$H;W$$$^$9$,!":#$O$b(B
> $B$&$A$g$C$H@)8B$7$F$bNI$$$+$J$H46$8$F$$$^$9!#LdBj$O$I$3$^$G5v(B
> $B$9$+$H$$$&@~$r$^$@0z$1$F$J$$$H$$$&$3$H$G$9$,!#(B

$B$U$`!#(B

  a b {} {}

$B$H$$$&$N$bLdBj$+$J(B?

> $B$+$C$3$r>JN,$G$-$k$N$O$"$/$^$G$b%*%W%7%g%J%k$G$"$k$H$$$&4QE@(B
> $B$+$i$O!"!VItJ,<0$G$O>JN,$G$-$J$$!W$H$$$&$N$OHf3SE*J,$+$j$d$9(B
> $B$$%k!<%k$@$H;W$$$^$9!#(Bdo$B$H$NMm$_$O$^$@7kO@$,=P$F$$$^$;$s!#(B

a = m 1, 2 do end $B$H$$$&$N$O8=:_5v$5$l$F$F!"(B= $B$N:8JU$H$$$&$l$C$-$H$7$?(B
$BItJ,<0$K=q$1$k$N$G!"$=$N$^$^J8;z$I$*$jE,MQ$9$k$o$1$K$b$$$+$J$=$&$G$9!#(B

$B$<$s$<$s:,5r$O$J$$$s$G$9$,!"$J$s$H$J$/!"%M%9%HIT2D$H$$$&$"$?$j$,BEEv$+(B
$B$J$!!"$H$$$&5$$,$7$F$$$^$9!#(B

> $B%Q%:%k8~$18@8l!)(B ^^;;;

yacc ($B$H$$$&$+(B LALR(1))$B$r$M$8$U$;$F$_$?$$$H$$$$$^$9$+!#(B
-- 
[$BEDCf(B $BE/(B][$B$?$J$+(B $B$"$-$i(B][Tanaka Akira]
$B!V$U$($m(B! $B$o$+$a$A$c$s:n@o$G$9$(C"=$B!W(B(Little Worker, $B7KM7@84](B)