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Parser

<language> An algorithm or program to determine the syntactic structure of a sentence or string of symbols in some language.

A parser normally takes as input a sequence of tokens output by a lexical analyser.

It may produce some kind of abstract syntax tree as output.

One of the best known parser generators is yacc.

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parm PARMACS ParMod PARS PARSEC	Ada ADVENT Alpha ANother Tool for Language Recognition as31	parser generator parsing Parsley Partial Differential Equation LANguage partial equivalence relation