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grammar.md

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CR = Enter

line ::= number statement CR | statement CR

statement ::= PRINT expr-list
              IF expression relop expression THEN statement
              GOTO expression
              INPUT var-list
              LET var = expression
              GOSUB expression
              RETURN
              CLEAR
              LIST
              RUN
              END

expr-list ::= (string|expression) (, (string|expression) )*

var-list ::= var (, var)*

expression ::= (+|-|ε) term ((+|-) term)*

term ::= factor ((*|/) factor)*

factor ::= var | number | (expression)

var ::= A | B | C ... | Y | Z

number ::= digit digit*

digit ::= 0 | 1 | 2 | 3 | ... | 8 | 9

relop ::= < (>|=|ε) | > (<|=|ε) | =

string ::= " (a|b|c ... |x|y|z|A|B|C ... |X|Y|Z|digit)* "