- lookahead sets
- n.向前查看集
English-Chinese dictionary of mining (英汉矿业大词典). 2013.
lookahead sets
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LALR parser — In computer science, a lookahead LR parser or LALR parser is a specialized form of LR parser that can deal with more context free grammars than Simple LR (SLR) parsers. It is a very popular type of parser because it gives a good trade off between … Wikipedia
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Canonical LR parser — A canonical LR parser or LR(1) parser is an LR parser whose parsing tables are constructed in a similar way as with LR(0) parsers except that the items in the item sets also contain a lookahead , i.e., a terminal that is expected by the parser… … Wikipedia
LL parser — An LL parser is a top down parser for a subset of the context free grammars. It parses the input from Left to right, and constructs a Leftmost derivation of the sentence (hence LL, compared with LR parser). The class of grammars which are… … Wikipedia
LR parser — In computer science, an LR parser is a parser for context free grammars that reads input from Left to right and produces a Rightmost derivation. The term LR( k ) parser is also used; here the k refers to the number of unconsumed look ahead input… … Wikipedia
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Top-down parsing — is a strategy of analyzing unknown data relationships by hypothesizing general parse tree structures and then considering whether the known fundamental structures are compatible with the hypothesis. It occurs in the analysis of both natural… … Wikipedia
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