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start-symbol PROGRAM
context-free syntax
PROGRAM ::= "begin" DECLS "|" (STATEMENT ";")* "end"
DECLS ::= "declare" (ID ",")*
context-free syntax
STATEMENT ::= ID ":=" EXP
context-free syntax
EXP ::= ID
EXP ::= NAT
EXP ::= EXP "+" EXP {left}
EXP ::= EXP "*" EXP {left}
EXP ::= "-" EXP
EXP ::= "(" EXP ")"
lexical syntax
ID ::= [a-z][a-z0-9]*
lexical syntax
NAT ::= [0] | [1-9][0-9]*
lexical syntax
LAYOUT ::= [\ \n]*
context-free priorities
EXP ::= "-" EXP >
EXP ::= "*" EXP >
EXP ::= "+" EXP
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