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40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
digit [0-9]
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id [a-zA-Z][a-zA-Z0-9]*
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%%
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"//".* /* ignore comment */
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"main" return 'MAIN';
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"class" return 'CLASS';
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"extends" return 'EXTENDS';
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"nat" return 'NATTYPE';
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"if" return 'IF';
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"else" return 'ELSE';
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"for" return 'FOR';
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"printNat" return 'PRINTNAT';
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"readNat" return 'READNAT';
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"this" return 'THIS';
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"new" return 'NEW';
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"var" return 'VAR';
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"null" return 'NUL';
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{digit}+ return 'NATLITERAL';
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{id} return 'ID';
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"==" return 'EQUALITY';
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"=" return 'ASSIGN';
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"+" return 'PLUS';
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"-" return 'MINUS';
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"*" return 'TIMES';
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">" return 'GREATER';
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"||" return 'OR';
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"!" return 'NOT';
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"." return 'DOT';
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"{" return 'LBRACE';
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"}" return 'RBRACE';
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"(" return 'LPAREN';
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")" return 'RPAREN';
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";" return 'SEMICOLON';
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\s+ /* skip whitespace */
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"." throw 'Illegal character';
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<<EOF>> return 'ENDOFFILE';
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