Re: FIRST_k, FOLLOW_k, k>1

Andy <borucki.andrzej@gmail.com>
Thu, 6 Feb 2020 14:16:24 -0800 (PST)

          From comp.compilers

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From: Andy <borucki.andrzej@gmail.com>
Newsgroups: comp.compilers
Date: Thu, 6 Feb 2020 14:16:24 -0800 (PST)
Organization: Compilers Central
References: 20-02-004
Injection-Info: gal.iecc.com; posting-host="news.iecc.com:2001:470:1f07:1126:0:676f:7373:6970"; logging-data="78141"; mail-complaints-to="abuse@iecc.com"
Keywords: parse, question
Posted-Date: 07 Feb 2020 22:16:30 EST
In-Reply-To: 20-02-004

I search examples,
E->aWbXYcdZ
W->w
X->x
Y->y
Z->z


if for FIRST(k=4) wil be: E={awbx} W={wbxy} X={xycd} Y={ycdz} Z={z}
what is convention?
E is obviously {awbx} but W is (difficult){wbxy} or only {w}?
FIRST(k=4)(W) we compute for alone W or W in context whole E?


similar:
E->aWbXYcdZ
W->w
X->x
Y->y
Y->
Z->z
;y->epsilon
will?
FIRST3: E={awb} W={wbx} X={xyc xcd} Y={ycd cdz} Z={z} ;dotyczy te┼╝ X
FIRST4: E={awbx} W={wbxy wbxc} X={xycd xcdz} Y={ycdz cdz} Z={z}


E->aWbXYcdZ
>E->X
W->w
X->x
Y->y
Y->
Z->z
will?
FIRST1: E={a x} W={w} X={x} Y={y c} Z={z}
FIRST2: E={aw x} W={wb} X={xy xc x} Y={yc cd} Z={z}
FIRST3: E={awb x} W={wbx} X={xyc xcd x} Y={ycd cdz} Z={z}
FIRST4: E={awbx x} W={wbxy wbxc} X={xycd xcdz x} Y={ycdz cdz} Z={z}
FOLLOW1: E={$} W={b} X={y c $} Y={c} Z={$}
FOLLOW2: E={$} W={bx} X={yc cd $} Y={cd} Z={$}
FOLLOW3: E={$} W={bxy bxc} X={ycd cdz $} Y={cdz} Z={$}
FOLLOW4: E={$} W={bxyc bxcd} X={ycdz cdz $} Y={cdz} Z={$}


etc


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