Python modules

These tools are used to write feature files which is be based on information found within UFO sources. The two main tools are kernFeatureWriter.py and markFeatureWriter.py.

kernFeatureWriter.py

    # write out a kern feature file
    python kernFeatureWriter.py font.ufo

    # write a kern feature file with minimum absolute kerning value of 5
    python kernFeatureWriter.py -min 5 font.ufo

    # write a kern feature with subtable breaks
    python kernFeatureWriter.py -s font.ufo

markFeatureWriter.py

    # write a basic mark feature
    python markFeatureWriter.py font.ufo

    # write mark and mkmk feature files
    python markFeatureWriter.py -m font.ufo

For both of these scripts, the resulting feature file only contains the raw feature data. This data can be used by means of an include statement:

feature kern{
    include(kern.fea);

} kern;

The benefit of this is that different feature flags can be used, see for example https://github.com/adobe-fonts/source-serif/blob/main/familyGPOS.fea#L12-L13

kernExport.py

FontLab 5-Module to export FontLab class-kerning to UFO. It needs to be called with a FL font object (fl.font), and a prefixOption. The prefixOption is used for renaming kerning classes to various UFO-styles.

If the prefixOption is None, class names will be prefixed with to @L_ and @R_ to keep track of their side (in case they need to be re-imported into FL).

The prefixOptions are:
'MM': convert class names to MetricsMachine-compatible group names
'UFO3': convert to UFO3-style class names

usage:

    kernExport.ClassKerningToUFO(fl.font)
    kernExport.ClassKerningToUFO(fl.font, prefixOption='MM')
    kernExport.ClassKerningToUFO(fl.font, prefixOption='UFO3')

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other modules (/vintage folder)

Other modules are FontLab scripts which were used in pre-UFO days in a FLS 5 environment. Those modules are not in active development.

AdobeFontLabUtils.py

Support module for FontLab scripts. Defines commonly used functions and globals.

BezChar.py

This module converts between a FontLab glyph and a bez file data string. Used by the OutlineCheck and AutoHint scripts, to convert FL glyphs to bez programs as needed by C libraries that do the hard work.

WriteFeaturesKernFDK.py

Kern feature writer.

WriteFeaturesMarkFDK.py

Mark feature writer.