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https://github.com/kovidgoyal/kitty
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List of all known OpenType font features
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Kovid Goyal
149
kitty/fonts/features.py
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149
kitty/fonts/features.py
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#!/usr/bin/env python
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# License: GPLv3 Copyright: 2024, Kovid Goyal <kovid at kovidgoyal.net>
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from enum import IntEnum
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from typing import Dict, NamedTuple
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class Type(IntEnum):
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boolean: int = 1
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index: int = 2
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hidden: int = 3
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class FeatureDefinition(NamedTuple):
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name: str
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type: Type
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# From: https://learn.microsoft.com/en-ca/typography/opentype/spec/featurelist
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known_features: Dict[str, FeatureDefinition] = { # {{{
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'aalt': FeatureDefinition('Access All Alternates', Type.index),
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'abvf': FeatureDefinition('Above-base Forms', Type.hidden),
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'abvm': FeatureDefinition('Above-base Mark Positioning', Type.hidden),
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'abvs': FeatureDefinition('Above-base Substitutions', Type.hidden),
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'afrc': FeatureDefinition('Alternative Fractions', Type.boolean),
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'akhn': FeatureDefinition('Akhand', Type.hidden),
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'blwf': FeatureDefinition('Below-base Forms', Type.hidden),
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'blwm': FeatureDefinition('Below-base Mark Positioning', Type.hidden),
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'blws': FeatureDefinition('Below-base Substitutions', Type.hidden),
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'calt': FeatureDefinition('Contextual Alternates', Type.boolean),
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'case': FeatureDefinition('Case-Sensitive Forms', Type.hidden),
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'ccmp': FeatureDefinition('Glyph Composition / Decomposition', Type.hidden),
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'cfar': FeatureDefinition('Conjunct Form After Ro', Type.hidden),
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'chws': FeatureDefinition('Contextual Half-width Spacing', Type.boolean),
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'cjct': FeatureDefinition('Conjunct Forms', Type.hidden),
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'clig': FeatureDefinition('Contextual Ligatures', Type.boolean),
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'cpct': FeatureDefinition('Centered CJK Punctuation', Type.boolean),
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'cpsp': FeatureDefinition('Capital Spacing', Type.boolean),
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'cswh': FeatureDefinition('Contextual Swash', Type.boolean),
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'curs': FeatureDefinition('Cursive Positioning', Type.hidden),
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'c2pc': FeatureDefinition('Petite Capitals From Capitals', Type.boolean),
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'c2sc': FeatureDefinition('Small Capitals From Capitals', Type.boolean),
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'dist': FeatureDefinition('Distances', Type.hidden),
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'dlig': FeatureDefinition('Discretionary Ligatures', Type.boolean),
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'dnom': FeatureDefinition('Denominators', Type.hidden),
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'dtls': FeatureDefinition('Dotless Forms', Type.hidden),
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'expt': FeatureDefinition('Expert Forms', Type.boolean),
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'falt': FeatureDefinition('Final Glyph on Line Alternates', Type.boolean),
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'fin2': FeatureDefinition('Terminal Forms #2', Type.hidden),
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'fin3': FeatureDefinition('Terminal Forms #3', Type.hidden),
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'fina': FeatureDefinition('Terminal Forms', Type.hidden),
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'flac': FeatureDefinition('Flattened accent forms', Type.hidden),
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'frac': FeatureDefinition('Fractions', Type.boolean),
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'fwid': FeatureDefinition('Full Widths', Type.boolean),
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'half': FeatureDefinition('Half Forms', Type.hidden),
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'haln': FeatureDefinition('Halant Forms', Type.hidden),
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'halt': FeatureDefinition('Alternate Half Widths', Type.boolean),
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'hist': FeatureDefinition('Historical Forms', Type.boolean),
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'hkna': FeatureDefinition('Horizontal Kana Alternates', Type.boolean),
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'hlig': FeatureDefinition('Historical Ligatures', Type.boolean),
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'hngl': FeatureDefinition('Hangul', Type.boolean),
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'hojo': FeatureDefinition('Hojo Kanji Forms (JIS X 0212-1990 Kanji Forms)', Type.boolean),
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'hwid': FeatureDefinition('Half Widths', Type.boolean),
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'init': FeatureDefinition('Initial Forms', Type.hidden),
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'isol': FeatureDefinition('Isolated Forms', Type.hidden),
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'ital': FeatureDefinition('Italics', Type.boolean),
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'jalt': FeatureDefinition('Justification Alternates', Type.boolean),
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'jp78': FeatureDefinition('JIS78 Forms', Type.boolean),
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'jp83': FeatureDefinition('JIS83 Forms', Type.boolean),
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'jp90': FeatureDefinition('JIS90 Forms', Type.boolean),
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'jp04': FeatureDefinition('JIS2004 Forms', Type.boolean),
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'kern': FeatureDefinition('Kerning', Type.boolean),
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'lfbd': FeatureDefinition('Left Bounds', Type.boolean),
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'liga': FeatureDefinition('Standard Ligatures', Type.boolean),
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'ljmo': FeatureDefinition('Leading Jamo Forms', Type.hidden),
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'lnum': FeatureDefinition('Lining Figures', Type.boolean),
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'locl': FeatureDefinition('Localized Forms', Type.hidden),
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'ltra': FeatureDefinition('Left-to-right alternates', Type.hidden),
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'ltrm': FeatureDefinition('Left-to-right mirrored forms', Type.hidden),
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'mark': FeatureDefinition('Mark Positioning', Type.hidden),
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'med2': FeatureDefinition('Medial Forms #2', Type.hidden),
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'medi': FeatureDefinition('Medial Forms', Type.hidden),
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'mgrk': FeatureDefinition('Mathematical Greek', Type.boolean),
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'mkmk': FeatureDefinition('Mark to Mark Positioning', Type.hidden),
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'mset': FeatureDefinition('Mark Positioning via Substitution', Type.hidden),
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'nalt': FeatureDefinition('Alternate Annotation Forms', Type.index),
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'nlck': FeatureDefinition('NLC Kanji Forms', Type.boolean),
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'nukt': FeatureDefinition('Nukta Forms', Type.hidden),
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'numr': FeatureDefinition('Numerators', Type.hidden),
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'onum': FeatureDefinition('Oldstyle Figures', Type.boolean),
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'opbd': FeatureDefinition('Optical Bounds', Type.boolean),
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'ordn': FeatureDefinition('Ordinals', Type.boolean),
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'ornm': FeatureDefinition('Ornaments', Type.index),
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'palt': FeatureDefinition('Proportional Alternate Widths', Type.boolean),
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'pcap': FeatureDefinition('Petite Capitals', Type.boolean),
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'pkna': FeatureDefinition('Proportional Kana', Type.boolean),
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'pnum': FeatureDefinition('Proportional Figures', Type.boolean),
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'pref': FeatureDefinition('Pre-Base Forms', Type.hidden),
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'pres': FeatureDefinition('Pre-base Substitutions', Type.hidden),
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'pstf': FeatureDefinition('Post-base Forms', Type.hidden),
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'psts': FeatureDefinition('Post-base Substitutions', Type.hidden),
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'pwid': FeatureDefinition('Proportional Widths', Type.boolean),
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'qwid': FeatureDefinition('Quarter Widths', Type.boolean),
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'rand': FeatureDefinition('Randomize', Type.boolean),
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'rclt': FeatureDefinition('Required Contextual Alternates', Type.hidden),
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'rkrf': FeatureDefinition('Rakar Forms', Type.hidden),
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'rlig': FeatureDefinition('Required Ligatures', Type.hidden),
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'rphf': FeatureDefinition('Reph Forms', Type.hidden),
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'rtbd': FeatureDefinition('Right Bounds', Type.boolean),
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'rtla': FeatureDefinition('Right-to-left alternates', Type.hidden),
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'rtlm': FeatureDefinition('Right-to-left mirrored forms', Type.hidden),
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'ruby': FeatureDefinition('Ruby Notation Forms', Type.boolean),
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'rvrn': FeatureDefinition('Required Variation Alternates', Type.hidden),
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'salt': FeatureDefinition('Stylistic Alternates', Type.index),
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'sinf': FeatureDefinition('Scientific Inferiors', Type.boolean),
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'size': FeatureDefinition('Optical size', Type.hidden),
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'smcp': FeatureDefinition('Small Capitals', Type.boolean),
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'smpl': FeatureDefinition('Simplified Forms', Type.boolean),
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'ssty': FeatureDefinition('Math script style alternates', Type.hidden),
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'stch': FeatureDefinition('Stretching Glyph Decomposition', Type.hidden),
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'subs': FeatureDefinition('Subscript', Type.boolean),
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'sups': FeatureDefinition('Superscript', Type.boolean),
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'swsh': FeatureDefinition('Swash', Type.index),
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'titl': FeatureDefinition('Titling', Type.boolean),
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'tjmo': FeatureDefinition('Trailing Jamo Forms', Type.hidden),
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'tnam': FeatureDefinition('Traditional Name Forms', Type.boolean),
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'tnum': FeatureDefinition('Tabular Figures', Type.boolean),
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'trad': FeatureDefinition('Traditional Forms', Type.index),
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'twid': FeatureDefinition('Third Widths', Type.boolean),
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'unic': FeatureDefinition('Unicase', Type.boolean),
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'valt': FeatureDefinition('Alternate Vertical Metrics', Type.boolean),
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'vatu': FeatureDefinition('Vattu Variants', Type.hidden),
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'vchw': FeatureDefinition('Vertical Contextual Half-width Spacing', Type.hidden),
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'vert': FeatureDefinition('Vertical Writing', Type.boolean),
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'vhal': FeatureDefinition('Alternate Vertical Half Metrics', Type.boolean),
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'vjmo': FeatureDefinition('Vowel Jamo Forms', Type.hidden),
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'vkna': FeatureDefinition('Vertical Kana Alternates', Type.boolean),
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'vkrn': FeatureDefinition('Vertical Kerning', Type.boolean),
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'vpal': FeatureDefinition('Proportional Alternate Vertical Metrics', Type.boolean),
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'vrt2': FeatureDefinition('Vertical Alternates and Rotation', Type.boolean),
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'vrtr': FeatureDefinition('Vertical Alternates for Rotation', Type.boolean),
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'zero': FeatureDefinition('Slashed Zero', Type.boolean),
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}
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for i in range(1, 100):
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known_features[f'cv{i:2d}'] = FeatureDefinition(f'Character Variant {i}', Type.index)
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for i in range(1, 20):
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known_features[f'ss{i:2d}'] = FeatureDefinition(f'Stylistic Set {i}', Type.boolean)
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# }}}
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