import re
import zipfile

STYLEPATH = 'OEBPS/styles/stylesheet.css'
fontPattern = "font-family: '(.*):(.*)';"


def fixFeatures(p):
    items = []
    for f in p.split("&"):
        partes = f.split("=")
        if len(partes) == 1:
            items.append(f'"{partes[0]}"')
        else:
            items.append(f'"{partes[0]}" {partes[1]}')
    return "font-feature-settings: "+", ".join(items)+";"


def fixFont(p):
    return "font-family: '"+p.group(1)+"'; "+fixFeatures(p.group(2))


filename = 'dae.epub'
zIn = zipfile.ZipFile(filename)
zOut = zipfile.ZipFile('dae-out.epub', 'w')
for file in zIn.infolist():
    buff = zIn.read(file.filename)
    if file.filename == STYLEPATH:
        content = buff.decode('utf-8')
        fixedStyle = re.sub(fontPattern, fixFont, content)
        zOut.writestr(STYLEPATH, fixedStyle)
    else:
        zOut.writestr(file, buff)
print(fixedStyle)