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#! /usr/bin/env python3
from fontTools.ttLib import TTFont
import sys
if len(sys.argv) < 2:
print("usage: subset-fpgm.py fontfile.ttf func-number...")
sys.exit(1)
fontfile = sys.argv[1]
func_nums = [int(x) for x in sys.argv[2:]]
font = TTFont(fontfile)
fpgm = font["fpgm"]
# Parse fpgm
asm = fpgm.program.getAssembly()
funcs = {}
stack = []
tokens = iter(asm)
for token in tokens:
if token.startswith("PUSH") or token.startswith("NPUSH"):
for token in tokens:
try:
num = int(token)
stack.append(num)
except ValueError:
break
if token.startswith("FDEF"):
num = stack.pop()
body = []
for token in tokens:
if token.startswith("ENDF"):
break
body.append(token)
funcs[num] = body
continue
assert 0, "Unexpected token in fpgm: %s" % token
# Subset!
funcs = {i: funcs[i] for i in func_nums}
# Put it back together:
asm = []
if funcs:
asm.append("PUSH[ ]")
nums = sorted(funcs.keys())
asm.extend(str(i) for i in nums)
for i in nums:
asm.append("FDEF[ ]")
asm.extend(funcs[i])
asm.append("ENDF[ ]")
import pprint
pprint.pprint(asm)
fpgm.program.fromAssembly(asm)
# Make sure it compiles
fpgm.program.getBytecode()
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