%import common.WS
%import common.CPP_COMMENT
%import common.INT
%import common.SIGNED_INT

%ignore WS
%ignore CPP_COMMENT

start: (stackop | arithop)*

stackop: (PUSH|POP) SEGMENT INDEX

PUSH: "push"
POP: "pop"

arithop: ADD
       | SUB
       | NEG
       | EQ
       | GT
       | LT
       | AND
       | OR
       | NOT

ADD: "add"
SUB: "sub"
NEG: "neg"
EQ: "eq"
GT: "gt"
LT: "lt"
AND: "and"
OR: "or"
NOT: "not"

SEGMENT: "argument"
       | "local"
       | "static"
       | "constant"
       | "this"
       | "that"
       | "pointer"
       | "temp"

INDEX: INT