18 lines
320 B
Plaintext
18 lines
320 B
Plaintext
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//define a tiny grammar for arith expressions with identifiers
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grammar Example2;
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full_expr: expr ';' EOF ;
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expr: expr OP expr
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| ID {print('oh an id : '+$ID.text)}
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| INT
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;
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OP : '+'| '*' | '-' | '/' ;
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INT : '0'..'9'+ ;
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ID : ('a'..'z'|'A'..'Z')+ ;
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WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
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