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font-patcher: Use list comprehension in refcheck

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[why]
List comprehension helps with readability. Also add comments that
describe expected data structures of altuni and references. Also bump up
the patcher version number.

[how]
Use list comprehension. Add comments. Change the version number.
This commit is contained in:
Nathaniel Evan 2023-01-22 03:39:13 +07:00 committed by Fini Jastrow
parent 46e2fcf00d
commit e514906a9f
1 changed files with 15 additions and 8 deletions
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23
font-patcher
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@ -6,7 +6,7 @@
from __future__ import absolute_import, print_function, unicode_literals from __future__ import absolute_import, print_function, unicode_literals
# Change the script version when you edit this script: # Change the script version when you edit this script:
script_version = "3.5.0" script_version = "3.5.1"
version = "2.3.0" version = "2.3.0"
projectName = "Nerd Fonts" projectName = "Nerd Fonts"
@ -915,17 +915,24 @@ class font_patcher:
def add_glyphrefs_to_essential(self, unicode): def add_glyphrefs_to_essential(self, unicode):
self.essential.add(unicode) self.essential.add(unicode)
# According to fontforge spec, altuni is either None or a tuple of tuples # According to fontforge spec, altuni is either None or a tuple of tuples
if self.sourceFont[unicode].altuni is not None: # Those tuples contained in altuni are of the following "format":
for r in self.sourceFont[unicode].altuni: # (unicode-value, variation-selector, reserved-field)
altuni = self.sourceFont[unicode].altuni
if altuni is not None:
for altcode in [ v for v, s, r in altuni if v >= 0 ]:
# If alternate unicode already exists in self.essential, # If alternate unicode already exists in self.essential,
# that means it has gone through this function before. # that means it has gone through this function before.
# Therefore we skip it to avoid infinite loop. # Therefore we skip it to avoid infinite loop.
# A unicode value of -1 basically means unused and is also worth skipping. # A unicode value of -1 basically means unused and is also worth skipping.
if r[0] not in self.essential and r[0] >= 0: if altcode not in self.essential:
self.add_glyphrefs_to_essential(r[0]) self.add_glyphrefs_to_essential(altcode)
for r in self.sourceFont[unicode].references: # From fontforge documentation:
if self.sourceFont[r[0]].unicode not in self.essential and self.sourceFont[r[0]].unicode >= 0: # glyph.references return a tuple of tuples containing, for each reference in foreground,
self.add_glyphrefs_to_essential(self.sourceFont[r[0]].unicode) # a glyph name, a transformation matrix, and whether the reference is currently selected.
references = self.sourceFont[unicode].references
for refcode in [ self.sourceFont[n].unicode for n, m, s in references ]:
if refcode not in self.essential and refcode >= 0:
self.add_glyphrefs_to_essential(refcode)
def get_essential_references(self): def get_essential_references(self):
"""Find glyphs that are needed for the basic glyphs""" """Find glyphs that are needed for the basic glyphs"""