bnf.txt

<statement> ::= wait until <point>
              | wait <delta>

<statement> ::= <statement> ; <statement>

<expression> ::= weekday <expression>

<statement> ::= <name> = <expression>

<expression> ::= <expression> <point>

<point> ::= <name>

<statement> ::= <expression>

<expression> ::= <expression> + <expression>
               | <expression> - <expression>
               | <expression> > <expression>
               | <expression> < <expression>
               | <expression> >= <expression>
               | <expression> <= <expression>
               | <expression> == <expression>
               | <expression> != <expression>

<point> ::= <relativeindex> in <month>
          | <relativeindex> in <integer>
          | <relativeindex> in <basedate>
          | <relativeindex> in <relativeindex>
          | <relativeindex>

<relativeindex> ::= <indexableop> <weekday>
                  | <indexableop> month

<expression> ::= <unit> until <expression>
               | <unit> since <expression>
               | <unit> since <name>
               | <unit> until <name>

<expression> ::= <delta>
               | <timestamp>
               | <point>

<timestamp> ::= <integer>

<expression> ::= <expression> in <unit>

<point> ::= <timestamp>
          | <basedate>
          | <datetime>
          | <month>
          | <weekday>
          | <year>

<expression> ::= <expression> . weekday

<expression> ::= <expression> . <name>

<expression> ::= - <delta>

<filter> ::= day <integer>
           | <weekday>
           | day < <integer>
           | day > <integer>
           | day <= <integer>
           | day >= <integer>
           | day = <integer>
           | <weekday>
           | <filter> <filter>

<range> ::= <integer> to <integer>
          | <integer> to <basedate>
          | <integer> to <datetime>
          | <datetime> to <integer>
          | <basedate> to <basedate>
          | <datetime> to <basedate>
          | <basedate> to <datetime>
          | <datetime> to <datetime>
          | <basedate> to <integer>

<expression> ::= <filter> in <integer>
               | <filter> in <basedate>
               | <filter> in <range>