041_Bottom_Up_Parsing

041_Bottom_Up_Parsing - Bottom-Up Parsing What is Bottom-Up...

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Unformatted text preview: Bottom-Up Parsing What is Bottom-Up Parsing? Idea: Apply productions in reverse to convert the user's program to the start symbol. As with top-down, could be done with a DFS or BFS, though this is rarely done in practice. We'll be exploring four directional , predictive bottom-up parsing techniques: Directional : Scan the input from left-to-right. Predictive : Guess which production should be inverted. Bottoms Up! One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T E One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T E T One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T E T E One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T E T E T One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T E T E T E One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T E T E T E T One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T E T E T E T E One View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ T E T E T E T E T E S A Second View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ A Second View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ + ( int + int + int ) $ T A Second View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ + ( int + int + int ) $ T + ( int + int + int ) $ E A Second View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ + ( int + int + int ) $ T + ( int + int + int ) $ E + ( + int + int ) $ E T A Second View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ + ( int + int + int ) $ T + ( int + int + int ) $ E + ( + int + int ) $ E T + ( + int + int ) $ E E A Second View of a Bottom-Up Parse S E $ E T E E + T T int T ( E ) int + ( int + int + int ) $ + ( int + int + int ) $ T + ( int + int + int ) $ E + ( + int + int ) $ E T + ( + int + int ) $ E E + ( + + int ) $ E E T A Second View of a Bottom-Up Parse S E $...
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This document was uploaded on 07/18/2011.

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041_Bottom_Up_Parsing - Bottom-Up Parsing What is Bottom-Up...

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