Скачать или смотреть Introduction to Parser | Top Down and Bottom Up Parser | Compiler Design

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A parser is a phase of a compiler that converts a token string into the corresponding Intermediate Representation (IR) using existing grammar. It is classified into two types: Top-down Parser and Bottom-up Parser. Top-down parsers generate parse trees using grammar productions, such as expanding non-terminals and using recursive descent or non-recursive descent parsers. Bottom-up parsers compress terminals and use the reverse of the rightmost derivation. Bottom-up parsers are classified into LR and Operator precedence parsers. Operator precedence parsers generate parse trees from given grammar and string, but only require two consecutive non-terminals and epsilon not appearing on the right-hand side of any production. Operator grammars are considered operator grammars if there is no production rule on the right-hand side.

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