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LR-attributed grammars are a special type of attribute grammars. They allow the attributes to be evaluated on LR parsing . As a result, attribute evaluation in LR-attributed grammars can be incorporated conveniently in bottom-up parsing. zyacc is based on LR-attributed grammars.
A GLR parser (generalized left-to-right rightmost derivation parser) is an extension of an LR parser algorithm to handle non-deterministic and ambiguous grammars. [1] The theoretical foundation was provided in a 1974 paper [2] by Bernard Lang (along with other general context-free parsers such as GLL).
However, it can be shown that when this happens the grammar is not an LR(0) grammar. A classic real-world example of a shift-reduce conflict is the dangling else problem. A small example of a non-LR(0) grammar with a shift-reduce conflict is: (1) E → 1 E (2) E → 1. One of the item sets found is: Item set 1 E → 1 • E E → 1 • + E → ...
In computer science, a Simple LR or SLR parser is a type of LR parser with small parse tables and a relatively simple parser generator algorithm. As with other types of LR(1) parser, an SLR parser is quite efficient at finding the single correct bottom-up parse in a single left-to-right scan over the input stream, without guesswork or backtracking.
The special attribute of this parser is that any LR(k) grammar with k>1 can be transformed into an LR(1) grammar. [1] However, back-substitutions are required to reduce k and as back-substitutions increase, the grammar can quickly become large, repetitive and hard to understand. LR(k) can handle all deterministic context-free languages. [1]
Today's NYT Connections puzzle for Tuesday, December 10, 2024The New York Times
A grammar is said to be SLR(1) if the following simple LR parser algorithm results in no ambiguity. If state s contains any item of the form A → a • Xb , where X is a terminal, and X is the next token in the input string, then the action is to shift the current input token onto the stack, and the new state to be pushed on the stack is the ...
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