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Calculator Example. Operators: plus, minus and multiply 4 5*2-1 or (4 5)*2-1 to enforce evaluation orderAll ANTLR grammars are subclasses of Lexer, Parser, or TreeParser . Parser Subclass. class ExprParser extends Parser; Specify rules in EBNF notationexpr: mexpr ((PLUS|MINUS) mexpr)* ; mexpr

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