eBookReaderSwitch/scripts/makesubset.py

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#!/usr/bin/env python3
# Convert MES-2 (or WGL4) character set to list of glyphs for font subsetting.
# Also add small-caps glyph names for small letters and ligatures.
import sys
glyphs = {}
for line in open("scripts/glyphlist.txt").readlines():
if len(line) > 0 and line[0] != '#':
n, u = line.rstrip().split(';')
if len(u) == 4:
u = int(u, base=16)
if u >= 0x0000 and u <= 0x001F: continue # control block 1
if u >= 0x007F and u <= 0x009F: continue # control block 2
if u >= 0x2500 and u <= 0x25FF: continue # Box Drawing, Block Elements, Geometric Shapes
if u not in glyphs:
glyphs[u] = [n]
else:
glyphs[u].append(n)
# Ligatures are mapped to 'fi' and 'fl'; we also want them using the 'f_i' convention.
table = {}
do_small = False
def load_table(fn):
for line in open(fn).readlines():
is_small = ('SMALL LETTER' in line) or ('SMALL LIGATURE' in line)
u = int(line.split()[0], 16)
if u in glyphs:
for n in glyphs[u]:
table[n] = u
if do_small and is_small:
table[n+'.sc'] = u
if u >= 128:
table['uni%04X'%u] = u
if do_small and is_small:
table['uni%04X.sc'%u] = u
def load_ligs():
table['ff'] = 0xFB00
table['fi'] = 0xFB01
table['fl'] = 0xFB02
table['ffi'] = 0xFB03
table['ffl'] = 0xFB04
if do_small:
table['f_f.sc'] = 0xFB00
table['f_i.sc'] = 0xFB01
table['f_l.sc'] = 0xFB02
table['f_f_i.sc'] = 0xFB03
table['f_f_l.sc'] = 0xFB04
if len(sys.argv) < 2:
print('usage: python scripts/makesubset.py scripts/MES-2.TXT', file=sys.stderr)
else:
for input in sys.argv[1:]:
if input == '-sc':
do_small = True
elif input == '-lig':
load_ligs()
else:
load_table(input)
if len(sys.argv) > 2 and sys.argv[2] == '-scdump':
smcp = []
for n in list(table.keys()):
u = table[n]
if u > 0 and n.endswith('.sc') and not n.startswith('uni'):
smcp.append('{0x%04X, "%s"},' % (u,n))
smcp.sort()
print('\n\t'.join(smcp))
else:
list = list(table.keys())
list.sort()
print(','.join(list))