
In the field of formal languages apart from context free grammar (CFG) a new approach is developed i.e. Parsing Expression Grammar (PEG). Parsing Expression Grammar (PEG) is a new way to specify recursive-descent parsers with limited backtracking. The use of backtracking lifts the LL(1) restriction usually imposed by top-down parsers. In addition, PEG can directly define the structures that usually require a separate “lexer” or “scanner”. The parser has many useful properties, and with the use of memorization, it works in a linear time. This paper reports an experiment that consisted of defining PEG formalism, and literally transcribing the PEG definitions into parsing procedures.
backtracking, memorization, lexer, PEG, CFG
backtracking, memorization, lexer, PEG, CFG
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