'Lalr parsing tables' diaporamas de présentation

LESSON 23

LESSON 23. Overview of Previous Lesson(s). Over View. LR(k) parsing L is for left-to-right scanning of the input. R is for constructing a rightmost derivation in reverse. (k) represents the number of input symbols of look-ahead that are used in making parsing decisions.

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LESSON 24

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LALR Parsing

LALR Parsing. Canonical sets of LR(1) items Number of states much larger than in the SLR construction LR(1) = Order of thousands for a standard prog. Lang. SLR(1) = order of hundreds for a standard prog. Lang. LALR(1) (lookahead-LR) A tradeoff:

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