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S ifthen s else s else 4 winter 2013 s ifthen s

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Unformatted text preview: CSE341: Programming Languages Languages •  Situa;on: both a shiU and a reduce are possible at a Lecture oint Ln the parse given p 1 i ecture 1 Course Course Mechanics Mechanics (equivalently: in a pML Variabletate of the DFA) ar;cular s Bindings ML Variable Bindings •  Classic example: if- else statement (condi;on Dan Grossman Dan Grossman omihed to save s2011 pace) Fall 2011 Fall S ::= iUhen S | iUhen S else S Winter 2013 UW CSE 401 (Michael Ringenburg) 8 1/25/13 Parser States •  State 3 has a shiU- reduce conflict –  Can shiU past else into state 4 (s4) –  Can reduce (r1) S ::= iUhen S 1. 2. 1 S ::= ifthen S S ::= ifthen S else S S ::= . ifthen S S ::= . ifthen S else S ifthen 2 S ::= ifthen . S S ::= ifthen . S else S S (Note: some items omihed in states 2- 4 to save space) 3 S ::= ifthen S . S ::= ifthen S...
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