grammar SQLTokens
  rule SPACE
    " "
  end

  rule OPEN_PARENS
    '('
  end

  rule CLOSE_PARENS
    ')'
  end
  
  rule EMPTY_STRING
    '' { def eval; nil; end }
  end
  
  rule TRUE
    "TRUE" {
      def eval
        true
      end
    }
  end

  rule FALSE
    "FALSE" {
      def eval
        false
      end
    }
  end
  
  rule SINGLE_QUOTE
    "'"
  end
  
  rule DOUBLE_QUOTE
    "\""
  end

  rule BACKTICK
    "`"
  end
  
  rule COMMA
    ","
  end
  
  rule STRING_CHARS
    [0-9a-zA-Z\$_]
  end
  
  rule ALPHA_CHARS
    [a-zA-Z]
  end
  
  rule NON_QUOTE_CHARS
    [^'"]
  end
  
  rule DIGIT
    [0-9]
  end
  
  rule DASH
    "-" { def eval; nil; end }
  end
  
  rule MINUS_OR_DIGIT
    DASH / DIGIT
  end

  rule REAL_KEYWORD
    "REAL"
  end

  rule DOUBLE_KEYWORD
    "DOUBLE"
  end

  rule FLOAT_KEYWORD
    "FLOAT"
  end

  rule DECIMAL_KEYWORD
    "DECIMAL"
  end

  rule NUMERIC_KEYWORD
    "NUMERIC"
  end
  
  rule SMALL_INT_KEYWORD
    "SMALLINT"
  end

  rule TINY_INT_KEYWORD
    "TINYINT"
  end

  rule INT_KEYWORD
    "INT"
  end

  rule INTEGER_KEYWORD
    "INTEGER"
  end
  
  rule ZEROFILL_KEYWORD
    "ZEROFILL"
  end
  
  rule UNSIGNED_KEYWORD
    "UNSIGNED"
  end
  
  rule BIG_INT_KEYWORD
    "BIGINT"
  end
  
  rule VARCHAR_KEYWORD
    "VARCHAR"
  end
end