528614e6e2
git-svn-id: svn://svn.code.sf.net/p/fonttools/code/trunk@59 4cde692c-a291-49d1-8350-778aa11640f8
347 lines
8.6 KiB
Python
347 lines
8.6 KiB
Python
import StringIO
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import regex
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import string
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from fontTools.misc import eexec
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import types
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from psOperators import *
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ps_special = '()<>[]{}%' # / is one too, but we take care of that one differently
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whitespace = string.whitespace
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skipwhiteRE = regex.compile("[%s]*" % whitespace)
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endofthingPat = "[^][(){}<>/%s%s]*" % ('%', whitespace)
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endofthingRE = regex.compile(endofthingPat)
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commentRE = regex.compile("%[^\n\r]*")
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# XXX This not entirely correct:
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stringPat = """
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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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"""
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stringPat = string.join(string.split(stringPat), '')
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stringRE = regex.compile(stringPat)
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hexstringRE = regex.compile("<[%s0-9A-Fa-f]*>" % whitespace)
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ps_tokenerror = 'ps_tokenerror'
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ps_error = 'ps_error'
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class PSTokenizer(StringIO.StringIO):
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def getnexttoken(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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whitematch = skipwhiteRE.match):
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self.pos = self.pos + whitematch(self.buf, self.pos)
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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 = buf[pos]
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if char in ps_special:
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if char in '{}[]':
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tokentype = 'do_special'
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token = char
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elif char == '%':
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tokentype = 'do_comment'
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commentlen = commentmatch(buf, pos)
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token = buf[pos:pos+commentlen]
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elif char == '(':
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tokentype = 'do_string'
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strlen = stringmatch(buf, pos)
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if strlen < 0:
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raise ps_tokenerror, 'bad string at character %d' % pos
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token = buf[pos:pos+strlen]
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elif char == '<':
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tokentype = 'do_hexstring'
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strlen = hexstringmatch(buf, pos)
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if strlen < 0:
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raise ps_tokenerror, 'bad hexstring at character %d' % pos
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token = buf[pos:pos+strlen]
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else:
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raise ps_tokenerror, 'bad token at character %d' % pos
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else:
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if char == '/':
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tokentype = 'do_literal'
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endofthing = endmatch(buf, pos + 1) + 1
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else:
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tokentype = ''
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endofthing = endmatch(buf, pos)
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if endofthing <= 0:
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raise ps_tokenerror, 'bad token at character %d' % pos
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token = buf[pos:pos + endofthing]
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self.pos = pos + len(token)
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return tokentype, token
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def skipwhite(self, whitematch = skipwhiteRE.match):
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self.pos = self.pos + whitematch(self.buf, self.pos)
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def starteexec(self):
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self.pos = self.pos + 1
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#self.skipwhite()
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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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def flush(self):
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if self.buflist:
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self.buf = self.buf + string.join(self.buflist, '')
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self.buflist = []
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class PSInterpreter(PSOperators):
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def __init__(self):
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systemdict = {}
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userdict = {}
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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 callable(attr) 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)
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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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#print token
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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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finally:
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if self.tokenizer is not None:
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print 'ps error:\n- - - - - - -'
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print self.tokenizer.buf[self.tokenizer.pos-50:self.tokenizer.pos]
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print '>>>'
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print self.tokenizer.buf[self.tokenizer.pos:self.tokenizer.pos+50]
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print '- - - - - - -'
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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 dictstack[i].has_key(name):
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return dictstack[i][name]
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raise ps_error, 'name error: ' + str(name)
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def do_token(self, token,
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atoi = string.atoi,
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atof = string.atof,
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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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try:
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num = atoi(token)
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except (ValueError, OverflowError):
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try:
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num = atof(token)
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except (ValueError, OverflowError):
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if '#' in token:
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hashpos = string.find(token, '#')
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try:
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base = string.atoi(token[:hashpos])
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num = string.atoi(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 = string.join(string.split(token[1:-1]), '')
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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(string.atoi(hexStr[i:i+2], 16)))
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cleanstr = string.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 ps_tokenerror, '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 ps_error, '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 ps_error, 'typecheck, expected %s, found %s' % (`types`, object.type)
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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 == types.DictionaryType:
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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 == types.ListType:
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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):
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import re
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m = re.search(r"/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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else:
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fontName = None
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interpreter = PSInterpreter()
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interpreter.interpret("/Helvetica 4 dict dup /Encoding StandardEncoding put definefont pop")
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interpreter.interpret(data)
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fontdir = interpreter.dictstack[0]['FontDirectory'].value
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if fontdir.has_key(fontName):
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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 = 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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if __name__ == "__main__":
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import macfs
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fss, ok = macfs.StandardGetFile("LWFN")
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if ok:
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import t1Lib
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data, kind = t1Lib.read(fss.as_pathname())
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font = suckfont(data)
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