CSE 401: Compilers (Fall '99)

Details / Original Lex

You might also want to visit the extended lex (but this link won't work until after HW#2 is turned in).

Program	::=	(Token | Whitespace)*
Token	::=	Id | Integer | Keyword | Operator | Punctuation
Punctuation	::=	; | : | . | , | ( | )
Keyword	::=	module | procedure | begin | end | const | var | int | if | then | while | do | input | output | odd
Operator	::=	:= | * | / | + | - | = | <> | <= | < | >= | >
Integer	::=	Digit+
Id	::=	Letter AlphaNumeric*
AlphaNumeric	::=	Letter | Digit
Digit	::=	0 | ... | 9
Letter	::=	a | ... | z | A | ... | Z
Whitespace	::=	<space> | <tab> | <newline>