105 lines
3.4 KiB
Python
105 lines
3.4 KiB
Python
import logging
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import re
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import six # Python 2+3 compatibility
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from .glyphlist import glyphname2unicode
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from .latin_enc import ENCODING
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from .psparser import PSLiteral
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HEXADECIMAL = re.compile(r'[0-9a-fA-F]+')
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log = logging.getLogger(__name__)
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def name2unicode(name):
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"""Converts Adobe glyph names to Unicode numbers.
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In contrast to the specification, this raises a KeyError instead of return an empty string when the key is unknown.
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This way the caller must explicitly define what to do when there is not a match.
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Reference: https://github.com/adobe-type-tools/agl-specification#2-the-mapping
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:returns unicode character if name resembles something, otherwise a KeyError
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"""
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name = name.split('.')[0]
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components = name.split('_')
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if len(components) > 1:
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return ''.join(map(name2unicode, components))
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else:
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if name in glyphname2unicode:
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return glyphname2unicode.get(name)
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elif name.startswith('uni'):
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name_without_uni = name.strip('uni')
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if HEXADECIMAL.match(name_without_uni) and len(name_without_uni) % 4 == 0:
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unicode_digits = [int(name_without_uni[i:i + 4], base=16) for i in range(0, len(name_without_uni), 4)]
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for digit in unicode_digits:
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raise_key_error_for_invalid_unicode(digit)
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characters = map(six.unichr, unicode_digits)
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return ''.join(characters)
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elif name.startswith('u'):
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name_without_u = name.strip('u')
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if HEXADECIMAL.match(name_without_u) and 4 <= len(name_without_u) <= 6:
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unicode_digit = int(name_without_u, base=16)
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raise_key_error_for_invalid_unicode(unicode_digit)
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return six.unichr(unicode_digit)
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raise KeyError('Could not convert unicode name "%s" to character because it does not match specification' % name)
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def raise_key_error_for_invalid_unicode(unicode_digit):
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"""Unicode values should not be in the range D800 through DFFF because that is used for surrogate pairs in UTF-16
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:raises KeyError if unicode digit is invalid
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"""
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if 55295 < unicode_digit < 57344:
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raise KeyError('Unicode digit %d is invalid because it is in the range D800 through DFFF' % unicode_digit)
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class EncodingDB(object):
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std2unicode = {}
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mac2unicode = {}
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win2unicode = {}
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pdf2unicode = {}
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for (name, std, mac, win, pdf) in ENCODING:
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c = name2unicode(name)
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if std:
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std2unicode[std] = c
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if mac:
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mac2unicode[mac] = c
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if win:
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win2unicode[win] = c
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if pdf:
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pdf2unicode[pdf] = c
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encodings = {
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'StandardEncoding': std2unicode,
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'MacRomanEncoding': mac2unicode,
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'WinAnsiEncoding': win2unicode,
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'PDFDocEncoding': pdf2unicode,
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}
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@classmethod
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def get_encoding(klass, name, diff=None):
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cid2unicode = klass.encodings.get(name, klass.std2unicode)
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if diff:
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cid2unicode = cid2unicode.copy()
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cid = 0
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for x in diff:
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if isinstance(x, int):
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cid = x
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elif isinstance(x, PSLiteral):
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try:
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cid2unicode[cid] = name2unicode(x.name)
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except KeyError as e:
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log.debug(str(e))
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cid += 1
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return cid2unicode
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