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