Extract the font features in one method?

[JaavierR]

Hi!

Recently for a project I started working with font files and I found this repo that help me to achieve most of the tasks. But one of them is extract all the font features in a list, and I'm wondering if is exist a direct method to achieve this, for now I'm using a variation of this script, that is the most close approach that I found after looking on the docs and the issues/discussions.

Thanks in advance for your help!

[jsbien]

I am also interested in the problem and I was unaware of the script. What have you changed in it?

[ftCLI]

This is the function I use to get a list feature tags:

def get_font_feature_tags(font: TTFont) -> list:

    feature_tags = []

    for table in ("GSUB", "GPOS"):
        if table in font.keys():
            try:
                feature_tags += [tag.FeatureTag for tag in font[table].table.FeatureList.FeatureRecord]
            except KeyError:
                pass

    return sorted(list(set(feature_tags)))

[justvanrossum]

That's good. Small improvements suggested:

def get_font_feature_tags(font: TTFont) -> list:
    feature_tags = set()
    for table_tag in ("GSUB", "GPOS"):
        if table_tag in font:
            feature_tags.update(
                feature_record.FeatureTag
                for feature_record in font[table_tag].table.FeatureList.FeatureRecord
            )
    return sorted(feature_tags)

[JaavierR]

Thanks for the answers and suggestion!, I'm currently doing something like that, and It's seems that the lib by itself doesn't have a direct method, so I'm sticking with your solution.

Also thanks @justvanrossum for the suggestion!

@jsbien It was something similar to the solution suggested above, but more messy because I was testing until I ask here.

[jsbien]

What is exactly your goal? Are you aware of the human readable TTX format (produced by the ttx program)?