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Re^3: P6: Beginning grammar

by moritz (Cardinal)
on Jun 08, 2010 at 06:47 UTC ( #843621=note: print w/replies, xml ) Need Help??

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  1. or download this
    my %actions = 
       '*' => { $^a * $^b },
       '-' => { $^a - $^b };
    make %actions{$<op>.ast}.(|$/<lhs rhs>)
  2. or download this
    rule expression { <lhs=.numeric> <op> <rhs=.numeric> }
  3. or download this
    method numeric($/) { make +$/ }
    #                         ^  convert to a number
       make $value;
  4. or download this
    use v6;
    grammar Calc {
    say "$m<expression> =  $m.ast()";
    # vim: ft=perl6

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Node Type: note [id://843621]
[LanX]: I told you the story about the “new" currency trading system of Dresdner Bank
[LanX]: ?
[Corion]: No, or I don't remember the story ;)
LanX my favourite don't tell me the proof of concept is good enough for production anecdote
[ambrus]: ah, it's one of thos
[Eily]: what, there's a difference between proof of concept and production?
[LanX]: 20 years ago traders were complaining about the latency of the trading system...

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