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In formal language theory, an LL grammar is a context-free grammar that can be parsed by an LL parser, which parses the input from Left to right, and constructs a Leftmost derivation of the sentence (hence LL, compared with LR parser that constructs a rightmost derivation).

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We have built the parse table for an LL(1) grammar. An LL(k) table is exactly the same, only the columns are indexed by strings of k tokens. The primary rule for building the table is: If A ::= a is a grammar rule and w is in [Firstk(a) k Followk(A)] , then Table[A, w] is the rule A ::= a.

2015年12月16日 · It's actually a definition of a strong LL (k) grammar. First of all, see Raphael's comment. In short, the condition means that while parsing A A you can choose the next …

The LL(k) parser is a deterministic pushdown automaton with the ability to peek on the next k input symbols without reading. This peek capability can be emulated by storing the lookahead buffer contents in the finite state space, since both buffer and input alphabet are finite in size.

2023年8月2日 · An LL(k) language is a context-free language that can be parsed using an LL(k) parser. An LL(k) parser is a top-down parser that reads input from left to right, constructs a leftmost derivation of the input, and uses a fixed number (k) of lookahead symbols to make parsing decisions.

2020年9月16日 · A LL(k) parser is a k-predictive algorithm (k is the lookahead integer >= 1). A LL(k) parser can parse any LL(k) grammar. (chapter 5.1.2) for all a, b you have a < b => LL(b) grammar is also a LL(a) grammar. But the reverse is not true. A LL(k) parser is PREDICTIVE. So there is NO backtracking.