statements : statement statements
statements : label statement statements
statements :
statement : def-statement
statement : expr
statement : if-elif-else-statement
statement : while-statement
statement : for-statement
statement : goto-statement
statement : break-statement
statement : continue-statement
statement : do-while-statement
statement : repeat-until-statement
statement : return-statement
def-statement :
def-statement : type-expr 'id' '=' expr ';'
def-statement : type-expr 'id' ';'
return-statement : 'id'
if-elif-else-statement : 'if' '(' expr ')' statement-block elif-list maybe-else
statement-block : '{' statements '}'
statement-block : statement
elif-list :
elif-list : 'elseif' '(' expr ')' statement-block elif-list
maybe-else :
maybe-else : 'else' statement-block
while-statement : 'while' '(' expr ')' statement-block
for-statement : 'for' '('def-statement ';' expr ';' expr ')' statement-block
goto-statement : 'goto' 'id' ';'
break-statement : 'break' ';'
continue-statement : 'continue' ';'
do-while-statement : 'do' statement-block 'while' '(' expr ')'
repeat-until-statement : 'repeat' statement-block 'until' '(' expr ')'
return-statement : 'return' expr