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Winter 2013 uw cse 401 michael ringenburg 21 example

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Unformatted text preview: driven parsers for both LL and LR can be Lgenerated ecture 1 automaVcally ecture 1 Lby tools Course Course Mechanics Mechanics •  LL(1) has to make aML Variable ased on a single decision b Bindings ML Variable Bindings non- terminal and the next input symbol Grossman Dan he decision •  LR(1) can base tGrossman Dan allon the enVre leP F 2011 Fall 2011 context (i.e., contents of the stack) as well as the next input symbol Winter 2013 UW CSE 401 (Michael Ringenburg) 19 LL vs LR (2) CSE341: Programming CSE341: Programming Languages Languages •  Thus, LR(1) is more powerful than LL(1) Lecture g Lecture –  Includes a larger set 1rammars 1 Course Mechanics –  Some nCourserammars can be converted to LL on- LL g Mechanics ML Variable ML Variable Bindings grammars, but this Bindings modificaVons that requires make the grammar harder to understand. Dan Grossman Dan Grossman Fall 2011 –  However – some of the beHer automaVc tools Fall 2011 (e.g., ANTLR) can do some of this conversion for you. Latest version of ANTLR claims it can do all the work for you in many cases (but caveats if you read the fine print). Winter 2013 UW CSE 401 (Michael Ringenburg) 20 Recursive- Descent Parsers CSE341: Program...
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