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Mechanics non terminals a if producvons ml variable

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Unformatted text preview: nguages CSE341: Programming t some non- terminal A, •  Ideally, if we are SE341: Programming Languages and there are tLecture 1 possible 1 roducVons wo or more Lecture p A ::= α Course Course Mechanics Mechanics A ::= β ML Variable Bindings ML Variable Bindings we want to make the correct choice by looking at just the next input symbol Dan Grossman Dan Grossman F a predicCve parser •  If we can do this, all e can build all 2011 F w 2011 that can perform a top- down parse without backtracking Winter 2013 UW CSE 401 (Michael Ringenburg) 13 Example CSE341: CSE341: Programming Languages Languages •  Programming language gProgramming oPen suitable rammars are for predicVve parsing 1 Lecture 1 Lecture Course •  Typical example Mechanics Mechanics Course ML Variable Bindings stmt ::= id =Variable Bindings ML exp ; | return exp ; | if ( exp ) stmt | while ( exp ) stmt Dan Grossman D o the input If the next part anf Grossman begins with the tokens Fall 2011 Fall 2011 IF LPAREN ID(x) … we should expand stmt to an if- statement Winter 2013...
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