Fraction Fever 2

A while back I described an idea for a different approach to implementing a fraction feature. Since then, I have gotten feedback from Karsten Luecke and others, the algorithm has been improved and a large number of fonts have been released that use this implementation. The revised code is below. It now handles things like 2009/10/01, 1/22/333/4444/55555/666666/7777777 and so on. I haven’t modified this in a few months so I consider it “stable.” As before, feel free to use this if you want to, but do so at your own risk, it is provided “AS IS”, my company, Type Supply, and I are not liable for anything, etc., etc. etc.

The revised code:

@figures = [
    zero
    one
    two
    three
    four
    five
    six
    seven
    eight
    nine
];
@numerators = [
    zero.numerator
    one.numerator
    two.numerator
    three.numerator
    four.numerator
    five.numerator
    six.numerator
    seven.numerator
    eight.numerator
    nine.numerator
];
@denominators = [
    zero.denominator
    one.denominator
    two.denominator
    three.denominator
    four.denominator
    five.denominator
    six.denominator
    seven.denominator
    eight.denominator
    nine.denominator
];

feature frac {

   lookup FractionBar {
        ignore sub slash
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            @figures
            @figures
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            @figures
            @figures
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            @figures
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            @figures
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            @figures
            slash';
        ignore sub slash'
            @figures
            @figures
            slash;
        ignore sub slash
            @figures
            slash';
        ignore sub slash'
            @figures
            slash;
        sub @figures slash' @figures by fraction;
   } FractionBar;

   lookup Numerator1 {
        sub @figures'
        fraction by @numerators;
   } Numerator1;

   lookup Numerator2 {
        sub @figures'
        @numerators
        fraction by @numerators;
   } Numerator2;

   lookup Numerator3 {
        sub @figures'
        @numerators
        @numerators
        fraction by @numerators;
   } Numerator3;

   lookup Numerator4 {
        sub @figures'
        @numerators
        @numerators
        @numerators
        fraction by @numerators;
   } Numerator4;

   lookup Numerator5 {
        sub @figures'
        @numerators
        @numerators
        @numerators
        @numerators
        fraction by @numerators;
   } Numerator5;

   lookup Numerator6 {
        sub @figures'
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        fraction by @numerators;
   } Numerator6;

   lookup Numerator7 {
        sub @figures'
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        fraction by @numerators;
   } Numerator7;

   lookup Numerator8 {
        sub @figures'
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        fraction by @numerators;
   } Numerator8;

   lookup Numerator9 {
        sub @figures'
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        fraction by @numerators;
   } Numerator9;

   lookup Numerator10 {
        sub @figures'
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        @numerators
        fraction by @numerators;
   } Numerator10;

   lookup Denominator {
        sub [fraction @denominators]
        @figures' by @denominators;
   } Denominator;

   sub @figures space' @numerators by thinspace;

} frac;

PS: No, I don’t always break lines like this in my feature code. I did it to fit the column width here. Remove the unnecessary line breaks if you want to.