Difference between revisions of "LL(k) ---- LL(1) Parsers"
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== Example of a LL(1) grammar and his table == | == Example of a LL(1) grammar and his table == | ||
Revision as of 06:00, 10 June 2013
LL(k) - Left to right, Leftmost derivation with k lookahead symbols
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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