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397 lines
11 KiB
397 lines
11 KiB
#!/usr/bin/env python3
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""" Adobe character mapping (CMap) support.
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CMaps provide the mapping between character codes and Unicode
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code-points to character ids (CIDs).
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More information is available on the Adobe website:
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http://opensource.adobe.com/wiki/display/cmap/CMap+Resources
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"""
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import sys
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import os
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import os.path
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import gzip
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import pickle as pickle
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import struct
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import logging
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from . import cmap
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from .psparser import PSStackParser
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from .psparser import PSSyntaxError, PSEOF
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from .psparser import PSLiteral
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from .psparser import literal_name
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from .encodingdb import name2unicode
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from .utils import choplist, nunpack
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logger = logging.getLogger(__name__)
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class CMapError(Exception): pass
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class CMap:
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def __init__(self, code2cid=None):
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self.code2cid = code2cid or {}
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def is_vertical(self):
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return False
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def use_cmap(self, cmap):
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assert isinstance(cmap, CMap)
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def copy(dst, src):
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for (k,v) in src.items():
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if isinstance(v, dict):
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d = {}
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dst[k] = d
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copy(d, v)
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else:
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dst[k] = v
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copy(self.code2cid, cmap.code2cid)
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def decode(self, code):
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logger.debug('decode: %r, %r', self, code)
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if isinstance(code, str):
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code = code.encode('latin-1')
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d = self.code2cid
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for c in code:
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if c in d:
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d = d[c]
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if isinstance(d, int):
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yield d
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d = self.code2cid
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else:
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d = self.code2cid
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def dump(self, out=sys.stdout, code2cid=None, code=None):
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if code2cid is None:
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code2cid = self.code2cid
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code = ()
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for (k,v) in sorted(code2cid.items()):
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c = code+(k,)
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if isinstance(v, int):
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out.write('code %r = cid %d\n' % (c,v))
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else:
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self.dump(out=out, code2cid=v, code=c)
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class IdentityCMap:
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def __init__(self, vertical):
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self.vertical = vertical
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def is_vertical(self):
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return self.vertical
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def decode(self, code):
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if isinstance(code, str):
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code = code.encode('latin-1')
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if len(code) % 2 != 0:
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# Something's wrong, but we have to at least prevent a crash by removing the last char
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logger.warning("The code %r has an uneven length, trimming last byte.", code)
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code = code[:-1]
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n = len(code)//2
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if n:
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return struct.unpack('>%dH' % n, code)
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else:
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return ()
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class UnicodeMap:
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def __init__(self, cid2unichr=None):
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self.cid2unichr = cid2unichr or {}
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def get_unichr(self, cid):
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logger.debug('get_unichr: %r, %r', self, cid)
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return self.cid2unichr[cid]
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def dump(self, out=sys.stdout):
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for (k,v) in sorted(self.cid2unichr.items()):
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out.write('cid %d = unicode %r\n' % (k,v))
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class FileCMap(CMap):
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def __init__(self):
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CMap.__init__(self)
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self.attrs = {}
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def __repr__(self):
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return '<CMap: %s>' % self.attrs.get('CMapName')
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def is_vertical(self):
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return self.attrs.get('WMode', 0) != 0
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def set_attr(self, k, v):
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self.attrs[k] = v
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def add_code2cid(self, code, cid):
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assert isinstance(code, str) and isinstance(cid, int)
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d = self.code2cid
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for c in code[:-1]:
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c = ord(c)
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if c in d:
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d = d[c]
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else:
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t = {}
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d[c] = t
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d =t
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c = ord(code[-1])
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d[c] = cid
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class FileUnicodeMap(UnicodeMap):
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def __init__(self):
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UnicodeMap.__init__(self)
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self.attrs = {}
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def __repr__(self):
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return '<UnicodeMap: %s>' % self.attrs.get('CMapName')
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def set_attr(self, k, v):
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self.attrs[k] = v
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def add_cid2unichr(self, cid, code):
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assert isinstance(cid, int)
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if isinstance(code, str):
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# Interpret the contents of the string as bytes, and decode it as if it was bytes
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code = code.encode('latin-1')
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if isinstance(code, PSLiteral):
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# Interpret as an Adobe glyph name.
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self.cid2unichr[cid] = name2unicode(code.name)
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elif isinstance(code, bytes):
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# Interpret as UTF-16BE.
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self.cid2unichr[cid] = code.decode('UTF-16BE', 'ignore')
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elif isinstance(code, int):
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self.cid2unichr[cid] = chr(code)
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else:
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raise TypeError(repr(code))
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class PyCMap(CMap):
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def __init__(self, name, module):
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CMap.__init__(self, module.CODE2CID)
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self.name = name
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self._is_vertical = module.IS_VERTICAL
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def __repr__(self):
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return '<PyCMap: %s>' % (self.name)
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def is_vertical(self):
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return self._is_vertical
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class PyUnicodeMap(UnicodeMap):
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def __init__(self, name, module, vertical):
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if vertical:
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cid2unichr = module.CID2UNICHR_V
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else:
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cid2unichr = module.CID2UNICHR_H
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UnicodeMap.__init__(self, cid2unichr)
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self.name = name
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def __repr__(self):
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return '<PyUnicodeMap: %s>' % (self.name)
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class CMapDB:
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_cmap_cache = {}
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_umap_cache = {}
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class CMapNotFound(CMapError): pass
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@classmethod
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def _load_data(klass, name):
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filename = '%s.pickle.gz' % name
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logger.debug('loading: %s', name)
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default_path = os.environ.get('CMAP_PATH', '/usr/share/pdfminer/')
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for directory in (os.path.dirname(cmap.__file__), default_path):
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path = os.path.join(directory, filename)
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if os.path.exists(path):
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gzfile = gzip.open(path)
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try:
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return type(name, (), pickle.loads(gzfile.read()))
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finally:
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gzfile.close()
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else:
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raise CMapDB.CMapNotFound(name)
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@classmethod
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def get_cmap(klass, name):
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if name == 'Identity-H':
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return IdentityCMap(False)
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elif name == 'Identity-V':
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return IdentityCMap(True)
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try:
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return klass._cmap_cache[name]
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except KeyError:
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pass
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data = klass._load_data(name)
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klass._cmap_cache[name] = cmap = PyCMap(name, data)
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return cmap
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@classmethod
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def get_unicode_map(klass, name, vertical=False):
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try:
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return klass._umap_cache[name][vertical]
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except KeyError:
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pass
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data = klass._load_data('to-unicode-%s' % name)
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klass._umap_cache[name] = umaps = [PyUnicodeMap(name, data, v) for v in (False, True)]
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return umaps[vertical]
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class CMapParser(PSStackParser):
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def __init__(self, cmap, fp):
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PSStackParser.__init__(self, fp)
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self.cmap = cmap
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self._in_cmap = False
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def run(self):
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try:
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self.nextobject()
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except PSEOF:
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pass
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def do_keyword(self, pos, token):
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name = token.name
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if name == 'begincmap':
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self._in_cmap = True
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self.popall()
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return
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elif name == 'endcmap':
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self._in_cmap = False
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return
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if not self._in_cmap:
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return
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if name == 'def':
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try:
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((_,k),(_,v)) = self.pop(2)
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self.cmap.set_attr(literal_name(k), v)
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except PSSyntaxError:
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pass
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return
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if name == 'usecmap':
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try:
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((_,cmapname),) = self.pop(1)
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self.cmap.use_cmap(CMapDB.get_cmap(literal_name(cmapname)))
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except PSSyntaxError:
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pass
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except CMapDB.CMapNotFound:
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pass
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return
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if name == 'begincodespacerange':
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self.popall()
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return
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if name == 'endcodespacerange':
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self.popall()
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return
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if name == 'begincidrange':
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self.popall()
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return
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if name == 'endcidrange':
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objs = [ obj for (_,obj) in self.popall() ]
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for (s,e,cid) in choplist(3, objs):
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if (not isinstance(s, str) or not isinstance(e, str) or
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not isinstance(cid, int) or len(s) != len(e)): continue
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sprefix = s[:-4]
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eprefix = e[:-4]
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if sprefix != eprefix: continue
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svar = s[-4:]
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evar = e[-4:]
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s1 = nunpack(svar)
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e1 = nunpack(evar)
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vlen = len(svar)
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#assert s1 <= e1
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for i in range(e1-s1+1):
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x = sprefix+struct.pack('>L',s1+i)[-vlen:]
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self.cmap.add_code2cid(x, cid+i)
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return
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if name == 'begincidchar':
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self.popall()
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return
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if name == 'endcidchar':
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objs = [ obj for (_,obj) in self.popall() ]
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for (cid,code) in choplist(2, objs):
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if isinstance(code, str) and isinstance(cid, str):
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self.cmap.add_code2cid(code, nunpack(cid))
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return
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if name == 'beginbfrange':
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self.popall()
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return
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if name == 'endbfrange':
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objs = [ obj for (_,obj) in self.popall() ]
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# These objects were hex numbers and have been parsed into a string. But what we want
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# are bytes. Convert them.
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# Oh wait, it seems that sometimes we have bytes...
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tobytes = lambda o: (o.encode('ascii') if isinstance(o, str) else o)
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objs = [tobytes(o) for o in objs]
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for (s,e,code) in choplist(3, objs):
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if (not isinstance(s, bytes) or not isinstance(e, bytes) or
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len(s) != len(e)): continue
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s1 = nunpack(s)
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e1 = nunpack(e)
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#assert s1 <= e1
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if isinstance(code, list):
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for i in range(e1-s1+1):
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self.cmap.add_cid2unichr(s1+i, code[i])
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else:
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var = code[-4:]
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base = nunpack(var)
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prefix = code[:-4]
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vlen = len(var)
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for i in range(e1-s1+1):
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x = prefix+struct.pack('>L',base+i)[-vlen:]
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self.cmap.add_cid2unichr(s1+i, x)
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return
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if name == 'beginbfchar':
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self.popall()
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return
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if name == 'endbfchar':
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objs = [ obj for (_,obj) in self.popall() ]
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for (cid,code) in choplist(2, objs):
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if isinstance(cid, (str, bytes)) and isinstance(code, (str, bytes)):
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self.cmap.add_cid2unichr(nunpack(cid), code)
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return
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if name == 'beginnotdefrange':
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self.popall()
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return
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if name == 'endnotdefrange':
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self.popall()
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return
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self.push((pos, token))
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# test
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def main(argv):
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args = argv[1:]
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for fname in args:
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fp = open(fname, 'rb')
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cmap = FileUnicodeMap()
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#cmap = FileCMap()
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CMapParser(cmap, fp).run()
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fp.close()
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cmap.dump()
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if __name__ == '__main__':
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sys.exit(main(sys.argv))
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