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Automating Construction of Lexers

Automating Construction of Lexers. Example in javacc. TOKEN : { <IDENTIFIER: <LETTER> (<LETTER> | <DIGIT> | "_")* > | <INTLITERAL: <DIGIT> (<DIGIT>)* > | <LETTER: ["a"-"z"] | ["A"-"Z"]> | <DIGIT: ["0"-"9"]> } SKIP : { " " | " n " | " t " }

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Exercise: ( aa )* | ( aaa )*

Exercise: ( aa )* | ( aaa )*. Construct automaton and eliminate epsilons . Determinization : Subset Construction. keep track of a set of all possible states in which automaton could be view this finite set as one state of new automaton Apply to ( aa )* | ( aaa )*

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Automating Construction of Lexers

Exercise: ( aa )* | ( aaa )*