We provide a systematic transformation of an LL(1) grammar to an object model that consists of an object structure representing the non-terminal symbols and their corresponding grammar production rules, a union of classes representing the terminal symbols (tokens). We present a variant form of the visitor pattern and apply it to the above union of token classes to model a predictive recursive descent parser on the given grammar. Parsing a non-terminal is represented by a visitor to the tokens. For non-terminals that have more than one production rule, the corresponding visitors are chained together according to the chain of responsibility pattern in order to be processed correctly by a valid token. The abstract factory pattern, where each concrete factory corresponds to a non-terminal symbol, is used to manufacture appropriate parsing visitors.Our object-oriented formulation for predictive recursive descent parsing eliminates the traditional construction of the predictive parsing table and yields a parser that is declarative and has minimal conditionals. It not only serves to teach standard techniques in parsing but also as a non-trivial exercise of object modeling for objects-first introductory courses.
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Design patterns for parsing
Nguyen, Dung Zung; Ricken, Mathias; Wong, Stephen
Follow ACM SIGCSE Bulletin
, Volume 37 (1)
Association for Computing Machinery – Feb 23, 2005
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