Scoring

:Score(Weight)

This command is optional.

Each expression in a rule variable can contain an optional scoring weight. The scoring weight is specified by appending :Score(Weight), where weight is a whole number between 0 and 100, to the end of the expression. The Scoring command can precede an OR operator (|) or the end-of-variable character (;). If an expression does not have an explicit scoring command, a weight value of 100 will be presumed. In this case, the parsing score will be 0 or 100. If a rule variable contains other rule variables, its score value is averaged with the subordinate rules. For example, given the rule variable:

<root> = <a> <b> <c>;
<a> = 'a':Score (100);
<b> = 'b':Score (50);
<c> = 'c':Score (100);

the score for <root> is calculated as 83 [(100+50+100)/3]. When calculating an average, the score is rounded to the nearest whole number.

The total average score is output in the ParserScore field. The value of ParserScore will be between 0 and 100, as defined in the parsing grammar. 0 is returned when no matches are returned.

The scoring weight of parent expressions can affect the scoring weight of child expressions. For example, rule <C> that can be referenced by rule <A> and <B> as follows: 

<A> = <C>;
<B> = <C>:Score(50);
<C> = @Table("something"):Score(50);

If <A> is matched, it has a score of 100% (the default score) of the value of <C>, resulting in a scoring weight of 50. But, if <B> is matched, it has 50% of the value of <C>, resulting in a scoring weight of 25.

To use this command:

  1. Position the cursor where you want the command inserted.
  2. Double-click :Score in the Commands list.
  3. Type a value between 0 and 100 in the text box.
  4. Click OK.