Difference between revisions of "LL(k) ---- LL(1) Parsers"

Latest revision as of 01:31, 12 April 2014

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-'''LL(k)''' - '''L''' ''eft to right, '''L'''eftmost derivation with '''k''' lookahead symbols ''
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-<br><br>
-An '''LL(k)''' parser is a top-down parser, that is, it decides which production to use by looking at the next k tokens. This means that an LL(k) grammar must not have a point where the alternative productions have the same prefix, and that a production cannot be left-recursive - the left hand side must always resolve to a terminal. In addition, an LL(k) grammar must have a fixed value of k. Most LL(k) parsers are actually LL(1) parsers that use lookahead trees where it's necessary to disambiguate rules.
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-LL(k) parser generators
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-Modern parser generators that generate LL parsers with multi-token lookahead include:
-. '''ANTLR (old PCCTS)'''  [INSERIR LINK]
-. '''Coco/R''' [INSERIR LINK]
-. '''JavaCC'''
-. '''Parsec'''
-. '''SLK'''
-. '''Spirit Parser Framework'''
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-Please give a look at following document (definitions over LL(1) parsers and algorithm to construct table based LL(1)): [http://epl.di.uminho.pt/~gepl/LP/AlgorithmLL1.pdf Algorithm.pdf]
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-Example of a LL(1) grammar and his table: [http://epl.di.uminho.pt/~gepl/LP/LittleGarden.pdf LittleGarden.pdf]
-[[Category:Basic Concepts]]