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Lecture 8

# X add a x to new dan grossman dan grossman

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Unformatted text preview: : S’ ::= . S Lecture 1 S ::= ( . L1) \$ Lecture ( L ::= . L , S S ::=Course Mechanics Mechanics .(L) Course S ::= L Variable Bindings . SBindings .x ML L ::= Variable M S ::= . ( L ) S Dan Grossman Dan Grossman ::= . x Fall 2011 1. 2. 3. 4. S ::= ( L ) S ::= x L ::= S L ::= L , S Fall 2011 •  If we shiU past ( , we’re at the beginning of L •  The closure adds all produc;ons that start with L, which requires adding all produc;ons star;ng with S Winter 2013 26 UW CSE 401 (Michael Ringenburg) Reduce Ac;ons CSE341: Programming CSE341: Programming Languages Languages:= S \$ 0. S’ : S’ ::= . S Lecture 1 Lecture 1 \$ S S’ : S ::=Course Mechanics:= S . \$ .(L) Course Mechanics S ::= L Variable Bindings Bindings ML Variable M. x Dan Grossman Fall 2011 1. 2. 3. 4. S ::= ( L ) S ::= x L ::= S L ::= L , S Dan Grossman Fall 2011 •  If we reduce to S, and popping the rhs exposes the ﬁrst state, we can consume an S in the ﬁrst item. Add a goto transi;on on S for this. Winter 2013 UW CSE 401 (Michael Ringenburg) 27 1/25/13 Basic Opera;ons CSE341: Programming Languages CSE341: •  Closure (S Programming Languages ) Lecture 1 Lecture 1 –  Adds all items “...
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