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"""A separate module for glyphname to filename functions.
glyphNameToShortFileName() generates a non-clashing filename for systems with
filename-length limitations.
"""
MAXLEN = 31
def glyphNameToShortFileName(glyphName, glyphSet):
"""Alternative glyphname to filename function.
Features a garuanteed maximum filename for really long glyphnames, and clash testing.
- all non-ascii characters are converted to "_" (underscore), including "."
- all glyphnames which are too long are truncated and a hash is added at the end
- the hash is generated from the whole glyphname
- finally, the candidate glyphname is checked against the contents.plist
and a incrementing number is added at the end if there is a clash.
"""
import binascii, struct, string
ext = ".glif"
ok = string.ascii_letters + string.digits + " _"
h = binascii.hexlify(struct.pack(">l", binascii.crc32(glyphName)))
n = ''
for c in glyphName:
if c in ok:
if c != c.lower():
n += c + "_"
else:
n += c
else:
n += "_"
if len(n + ext) < MAXLEN:
return n + ext
count = 0
candidate = n[:MAXLEN - len(h + ext)] + h + ext
if glyphSet is not None:
names = glyphSet.getReverseContents()
while candidate.lower() in names:
candidate = n[:MAXLEN - len(h + ext + str(count))] + h + str(count) + ext
count += 1
return candidate
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