PEG grammar

gistfile1.txt

grammar SrchStrings
    rule statement
        expression
    end



    rule expression
        or_expression / and_expression / not_expression / literal
    end

    rule or_expression
        loperand:(and_expression / not_expression / literal) whitespace op:or_operator whitespace roperand:(or_expression / and_expression / not_expression / literal) <BinaryExpression>
    end

    rule and_expression
        loperand:(not_expression / literal) whitespace op:and_operator whitespace roperand:(and_expression / not_expression / literal) <BinaryExpression>
    end

    rule not_expression
        op:not_operator whitespace operand:(not_expression / literal) <UnaryExpression>
    end



    rule or_operator
        'OR'
    end

    rule and_operator
        'AND'
    end

    rule not_operator
        'NOT'
    end



    rule literal
        quoted_literal / unquoted_literal / grouping
    end

    rule quoted_literal
        '"' [\s\w]+ '"' <Literal>
    end

    rule unquoted_literal
        !(and_operator / or_operator) [\w]+ <Literal>
    end

    rule grouping
        "(" whitespace? expression whitespace? ")" <Grouping>
    end



    rule whitespace
        [\s]+
    end
end