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399 lines
12 KiB
Python
399 lines
12 KiB
Python
from fontTools.misc.textTools import bytechr, byteord, bytesjoin, tobytes, tostr
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from fontTools.misc import eexec
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from .psOperators import (
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PSOperators,
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ps_StandardEncoding,
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ps_array,
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ps_boolean,
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ps_dict,
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ps_integer,
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ps_literal,
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ps_mark,
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ps_name,
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ps_operator,
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ps_procedure,
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ps_procmark,
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ps_real,
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ps_string,
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)
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import re
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from collections.abc import Callable
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from string import whitespace
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import logging
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log = logging.getLogger(__name__)
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ps_special = b"()<>[]{}%" # / is one too, but we take care of that one differently
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skipwhiteRE = re.compile(bytesjoin([b"[", whitespace, b"]*"]))
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endofthingPat = bytesjoin([b"[^][(){}<>/%", whitespace, b"]*"])
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endofthingRE = re.compile(endofthingPat)
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commentRE = re.compile(b"%[^\n\r]*")
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# XXX This not entirely correct as it doesn't allow *nested* embedded parens:
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stringPat = rb"""
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\(
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(
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(
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[^()]* \ [()]
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)
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(
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[^()]* \( [^()]* \)
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)
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)*
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[^()]*
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\)
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"""
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stringPat = b"".join(stringPat.split())
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stringRE = re.compile(stringPat)
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hexstringRE = re.compile(bytesjoin([b"<[", whitespace, b"0-9A-Fa-f]*>"]))
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class PSTokenError(Exception):
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pass
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class PSError(Exception):
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pass
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class PSTokenizer(object):
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def __init__(self, buf=b"", encoding="ascii"):
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# Force self.buf to be a byte string
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buf = tobytes(buf)
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self.buf = buf
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self.len = len(buf)
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self.pos = 0
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self.closed = False
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self.encoding = encoding
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def read(self, n=-1):
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"""Read at most 'n' bytes from the buffer, or less if the read
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hits EOF before obtaining 'n' bytes.
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If 'n' is negative or omitted, read all data until EOF is reached.
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"""
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if self.closed:
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raise ValueError("I/O operation on closed file")
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if n is None or n < 0:
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newpos = self.len
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else:
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newpos = min(self.pos + n, self.len)
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r = self.buf[self.pos : newpos]
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self.pos = newpos
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return r
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def close(self):
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if not self.closed:
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self.closed = True
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del self.buf, self.pos
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def getnexttoken(
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self,
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# localize some stuff, for performance
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len=len,
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ps_special=ps_special,
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stringmatch=stringRE.match,
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hexstringmatch=hexstringRE.match,
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commentmatch=commentRE.match,
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endmatch=endofthingRE.match,
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):
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self.skipwhite()
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if self.pos >= self.len:
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return None, None
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pos = self.pos
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buf = self.buf
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char = bytechr(byteord(buf[pos]))
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if char in ps_special:
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if char in b"{}[]":
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tokentype = "do_special"
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token = char
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elif char == b"%":
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tokentype = "do_comment"
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_, nextpos = commentmatch(buf, pos).span()
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token = buf[pos:nextpos]
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elif char == b"(":
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tokentype = "do_string"
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m = stringmatch(buf, pos)
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if m is None:
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raise PSTokenError("bad string at character %d" % pos)
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_, nextpos = m.span()
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token = buf[pos:nextpos]
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elif char == b"<":
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tokentype = "do_hexstring"
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m = hexstringmatch(buf, pos)
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if m is None:
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raise PSTokenError("bad hexstring at character %d" % pos)
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_, nextpos = m.span()
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token = buf[pos:nextpos]
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else:
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raise PSTokenError("bad token at character %d" % pos)
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else:
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if char == b"/":
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tokentype = "do_literal"
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m = endmatch(buf, pos + 1)
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else:
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tokentype = ""
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m = endmatch(buf, pos)
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if m is None:
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raise PSTokenError("bad token at character %d" % pos)
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_, nextpos = m.span()
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token = buf[pos:nextpos]
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self.pos = pos + len(token)
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token = tostr(token, encoding=self.encoding)
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return tokentype, token
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def skipwhite(self, whitematch=skipwhiteRE.match):
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_, nextpos = whitematch(self.buf, self.pos).span()
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self.pos = nextpos
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def starteexec(self):
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self.pos = self.pos + 1
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self.dirtybuf = self.buf[self.pos :]
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self.buf, R = eexec.decrypt(self.dirtybuf, 55665)
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self.len = len(self.buf)
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self.pos = 4
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def stopeexec(self):
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if not hasattr(self, "dirtybuf"):
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return
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self.buf = self.dirtybuf
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del self.dirtybuf
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class PSInterpreter(PSOperators):
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def __init__(self, encoding="ascii"):
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systemdict = {}
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userdict = {}
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self.encoding = encoding
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self.dictstack = [systemdict, userdict]
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self.stack = []
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self.proclevel = 0
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self.procmark = ps_procmark()
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self.fillsystemdict()
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def fillsystemdict(self):
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systemdict = self.dictstack[0]
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systemdict["["] = systemdict["mark"] = self.mark = ps_mark()
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systemdict["]"] = ps_operator("]", self.do_makearray)
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systemdict["true"] = ps_boolean(1)
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systemdict["false"] = ps_boolean(0)
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systemdict["StandardEncoding"] = ps_array(ps_StandardEncoding)
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systemdict["FontDirectory"] = ps_dict({})
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self.suckoperators(systemdict, self.__class__)
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def suckoperators(self, systemdict, klass):
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for name in dir(klass):
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attr = getattr(self, name)
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if isinstance(attr, Callable) and name[:3] == "ps_":
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name = name[3:]
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systemdict[name] = ps_operator(name, attr)
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for baseclass in klass.__bases__:
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self.suckoperators(systemdict, baseclass)
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def interpret(self, data, getattr=getattr):
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tokenizer = self.tokenizer = PSTokenizer(data, self.encoding)
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getnexttoken = tokenizer.getnexttoken
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do_token = self.do_token
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handle_object = self.handle_object
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try:
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while 1:
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tokentype, token = getnexttoken()
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if not token:
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break
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if tokentype:
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handler = getattr(self, tokentype)
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object = handler(token)
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else:
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object = do_token(token)
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if object is not None:
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handle_object(object)
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tokenizer.close()
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self.tokenizer = None
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except:
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if self.tokenizer is not None:
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log.debug(
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"ps error:\n"
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"- - - - - - -\n"
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"%s\n"
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">>>\n"
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"%s\n"
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"- - - - - - -",
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self.tokenizer.buf[self.tokenizer.pos - 50 : self.tokenizer.pos],
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self.tokenizer.buf[self.tokenizer.pos : self.tokenizer.pos + 50],
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)
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raise
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def handle_object(self, object):
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if not (self.proclevel or object.literal or object.type == "proceduretype"):
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if object.type != "operatortype":
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object = self.resolve_name(object.value)
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if object.literal:
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self.push(object)
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else:
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if object.type == "proceduretype":
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self.call_procedure(object)
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else:
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object.function()
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else:
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self.push(object)
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def call_procedure(self, proc):
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handle_object = self.handle_object
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for item in proc.value:
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handle_object(item)
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def resolve_name(self, name):
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dictstack = self.dictstack
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for i in range(len(dictstack) - 1, -1, -1):
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if name in dictstack[i]:
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return dictstack[i][name]
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raise PSError("name error: " + str(name))
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def do_token(
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self,
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token,
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int=int,
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float=float,
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ps_name=ps_name,
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ps_integer=ps_integer,
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ps_real=ps_real,
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):
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try:
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num = int(token)
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except (ValueError, OverflowError):
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try:
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num = float(token)
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except (ValueError, OverflowError):
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if "#" in token:
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hashpos = token.find("#")
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try:
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base = int(token[:hashpos])
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num = int(token[hashpos + 1 :], base)
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except (ValueError, OverflowError):
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return ps_name(token)
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else:
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return ps_integer(num)
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else:
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return ps_name(token)
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else:
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return ps_real(num)
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else:
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return ps_integer(num)
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def do_comment(self, token):
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pass
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def do_literal(self, token):
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return ps_literal(token[1:])
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def do_string(self, token):
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return ps_string(token[1:-1])
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def do_hexstring(self, token):
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hexStr = "".join(token[1:-1].split())
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if len(hexStr) % 2:
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hexStr = hexStr + "0"
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cleanstr = []
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for i in range(0, len(hexStr), 2):
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cleanstr.append(chr(int(hexStr[i : i + 2], 16)))
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cleanstr = "".join(cleanstr)
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return ps_string(cleanstr)
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def do_special(self, token):
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if token == "{":
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self.proclevel = self.proclevel + 1
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return self.procmark
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elif token == "}":
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proc = []
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while 1:
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topobject = self.pop()
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if topobject == self.procmark:
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break
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proc.append(topobject)
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self.proclevel = self.proclevel - 1
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proc.reverse()
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return ps_procedure(proc)
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elif token == "[":
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return self.mark
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elif token == "]":
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return ps_name("]")
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else:
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raise PSTokenError("huh?")
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def push(self, object):
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self.stack.append(object)
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def pop(self, *types):
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stack = self.stack
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if not stack:
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raise PSError("stack underflow")
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object = stack[-1]
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if types:
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if object.type not in types:
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raise PSError(
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"typecheck, expected %s, found %s" % (repr(types), object.type)
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)
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del stack[-1]
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return object
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def do_makearray(self):
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array = []
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while 1:
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topobject = self.pop()
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if topobject == self.mark:
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break
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array.append(topobject)
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array.reverse()
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self.push(ps_array(array))
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def close(self):
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"""Remove circular references."""
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del self.stack
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del self.dictstack
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def unpack_item(item):
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tp = type(item.value)
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if tp == dict:
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newitem = {}
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for key, value in item.value.items():
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newitem[key] = unpack_item(value)
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elif tp == list:
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newitem = [None] * len(item.value)
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for i in range(len(item.value)):
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newitem[i] = unpack_item(item.value[i])
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if item.type == "proceduretype":
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newitem = tuple(newitem)
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else:
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newitem = item.value
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return newitem
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def suckfont(data, encoding="ascii"):
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m = re.search(rb"/FontName\s+/([^ \t\n\r]+)\s+def", data)
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if m:
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fontName = m.group(1)
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fontName = fontName.decode()
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else:
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fontName = None
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interpreter = PSInterpreter(encoding=encoding)
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interpreter.interpret(
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b"/Helvetica 4 dict dup /Encoding StandardEncoding put definefont pop"
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)
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interpreter.interpret(data)
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fontdir = interpreter.dictstack[0]["FontDirectory"].value
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if fontName in fontdir:
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rawfont = fontdir[fontName]
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else:
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# fall back, in case fontName wasn't found
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fontNames = list(fontdir.keys())
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if len(fontNames) > 1:
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fontNames.remove("Helvetica")
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fontNames.sort()
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rawfont = fontdir[fontNames[0]]
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interpreter.close()
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return unpack_item(rawfont)
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