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83 lines
2.2 KiB
Python
83 lines
2.2 KiB
Python
"""Miscellaneous utility functions useful for dealing with ESIS streams."""
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__version__ = '$Revision$'
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import re
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import string
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import sys
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import xml.dom.core
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import xml.dom.esis_builder
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_data_rx = re.compile(r"[^\\][^\\]*")
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def decode(s):
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r = ''
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while s:
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m = _data_rx.match(s)
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if m:
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r = r + m.group()
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s = s[len(m.group()):]
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elif s[1] == "\\":
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r = r + "\\"
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s = s[2:]
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elif s[1] == "n":
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r = r + "\n"
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s = s[2:]
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else:
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raise ValueError, "can't handle " + `s`
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return r
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_charmap = {}
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for c in map(chr, range(256)):
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_charmap[c] = c
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_charmap["\n"] = r"\n"
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_charmap["\\"] = r"\\"
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del c
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def encode(s):
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return string.join(map(_charmap.get, s), '')
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class ExtendedEsisBuilder(xml.dom.esis_builder.EsisBuilder):
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def __init__(self, *args, **kw):
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self.__empties = {}
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self.__is_empty = 0
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apply(xml.dom.esis_builder.EsisBuilder.__init__, (self,) + args, kw)
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self.buildFragment()
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def feed(self, data):
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for line in string.split(data, '\n'):
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if not line:
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break
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event = line[0]
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text = line[1:]
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if event == '(':
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element = self.document.createElement(text, self.attr_store)
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self.attr_store = {}
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self.push(element)
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if self.__is_empty:
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self.__empties[text] = text
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self.__is_empty = 0
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elif event == ')':
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self.pop()
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elif event == 'A':
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l = re.split(' ', text, 2)
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name = l[0]
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value = decode(l[2])
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self.attr_store[name] = value
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elif event == '-':
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text = self.document.createText(decode(text))
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self.push(text)
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elif event == 'C':
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return
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elif event == 'e':
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self.__is_empty = 1
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elif event == '&':
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eref = self.document.createEntityReference(text)
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self.push(eref)
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else:
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sys.stderr.write('Unknown event: %s\n' % line)
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def get_empties(self):
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return self.__empties.keys()
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