737 B
737 B
Regular Expressions for PLATYPUS
Comments
L(COMMENT) = !< [^CR]*CR
Keywords
L(KEYWORD) = PLATYPUS | IF | THEN | ELSE | USING | REPEAT | INPUT | OUTPUT
Variable Identifiers
L(LETTER) = [a-zA-Z]
L(LETTER_OR_DIGIT) = [a-zA-Z0-9]
L(VID) = AVID | SVID
L(AVID) = [a-zA-Z]([a-zA-Z0-9])*
L(SVID) = AVID#
Integer Literals
L(DEC_INT_LITERAL) = [0-9]*
L(NON_ZERO_DIGIT) = 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9
L(DIGIT) = [0-9]+
L(OCT_DIGIT) = 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7
L(OCT_DIGIT_LITERAL) = 0(OCT_DIGIT)+
L(INT_LITERAL) = (DEC_INT_LITERAL | OCT_INT_LITERAL)
Floating Point Literal
L(FLP_LITERAL) = ([0-9]*).([0-9]+)
String Literal
L(STR_LITERAL) = "([a-ZA-Z_0-9])*"