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compapp- compiler construction-choosing lr 1 lookahead

  • 14-08-2006 11:33am
    #1
    quinnd6
    Registered Users, Registered Users 2 Posts: 1,559 ✭✭✭


    Choosing lr 1 lookahead


    Its a compiler onstuction question about constructing lr 1 itemsets from a grammar.

    I have an lr1 itemset example here and I dont understand it.

    I cant understand how the lookaheads are got in the lr 1 example. (lookaheads are after the ',')

    I2: S -> C.C , $
    C ->.cC ,$
    C ->.d ,$

    why are all lookaheads end of inputs?
    Theres a C after the dot in S so why isnt the lookahead
    cd?


Comments

  • #2
    gizmo
    Registered Users, Registered Users 2 Posts: 8,405 ✭✭✭gizmo


    The CA forums are probably your best place to look however I can see them being quiet at the moment, noticed you posted there too. You try mailing your class list?


  • #3
    Ferror
    Registered Users, Registered Users 2 Posts: 455 ✭✭Ferror


    If that happens to fail you could try asking nicely here...

    ;)


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