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437 lines
12 KiB
Python
437 lines
12 KiB
Python
"""plistlib.py -- a tool to generate and parse MacOSX .plist files.
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The main class in this module is Plist. It takes a set of arbitrary
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keyword arguments, which will be the top level elements of the plist
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dictionary. After instantiation you can add more elements by assigning
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new attributes to the Plist instance.
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To write out a plist file, call the write() method of the Plist
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instance with a filename or a file object.
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To parse a plist from a file, use the Plist.fromFile(pathOrFile)
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classmethod, with a file name or a file object as the only argument.
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(Warning: you need pyexpat installed for this to work, ie. it doesn't
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work with a vanilla Python 2.2 as shipped with MacOS X.2.)
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Values can be strings, integers, floats, booleans, tuples, lists,
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dictionaries, Data or Date objects. String values (including dictionary
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keys) may be unicode strings -- they will be written out as UTF-8.
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For convenience, this module exports a class named Dict(), which
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allows you to easily construct (nested) dicts using keyword arguments.
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But regular dicts work, too.
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To support Boolean values in plists with Python < 2.3, "bool", "True"
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and "False" are exported. Use these symbols from this module if you
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want to be compatible with Python 2.2.x (strongly recommended).
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The <data> plist type is supported through the Data class. This is a
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thin wrapper around a Python string.
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The <date> plist data has (limited) support through the Date class.
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(Warning: Dates are only supported if the PyXML package is installed.)
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Generate Plist example:
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pl = Plist(
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aString="Doodah",
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aList=["A", "B", 12, 32.1, [1, 2, 3]],
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aFloat = 0.1,
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anInt = 728,
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aDict=Dict(
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anotherString="<hello & hi there!>",
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aUnicodeValue=u'M\xe4ssig, Ma\xdf',
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aTrueValue=True,
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aFalseValue=False,
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),
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someData = Data("<binary gunk>"),
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someMoreData = Data("<lots of binary gunk>" * 10),
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aDate = Date(time.mktime(time.gmtime())),
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)
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# unicode keys are possible, but a little awkward to use:
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pl[u'\xc5benraa'] = "That was a unicode key."
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pl.write(fileName)
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Parse Plist example:
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pl = Plist.fromFile(pathOrFile)
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print pl.aKey
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"""
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# written by Just van Rossum (just@letterror.com), 2002-11-19
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__all__ = ["Plist", "Data", "Date", "Dict", "False", "True", "bool"]
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INDENT = "\t"
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class DumbXMLWriter:
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def __init__(self, file):
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self.file = file
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self.stack = []
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self.indentLevel = 0
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def beginElement(self, element):
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self.stack.append(element)
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self.writeln("<%s>" % element)
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self.indentLevel += 1
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def endElement(self, element):
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assert self.indentLevel > 0
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assert self.stack.pop() == element
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self.indentLevel -= 1
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self.writeln("</%s>" % element)
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def simpleElement(self, element, value=None):
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if value is not None:
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value = _encode(value)
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self.writeln("<%s>%s</%s>" % (element, value, element))
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else:
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self.writeln("<%s/>" % element)
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def writeln(self, line):
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if line:
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self.file.write(self.indentLevel * INDENT + line + "\n")
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else:
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self.file.write("\n")
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def _encode(text):
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text = text.replace("&", "&")
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text = text.replace("<", "<")
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return text.encode("utf-8")
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PLISTHEADER = """\
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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"""
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class PlistWriter(DumbXMLWriter):
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def __init__(self, file):
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file.write(PLISTHEADER)
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DumbXMLWriter.__init__(self, file)
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def writeValue(self, value):
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if isinstance(value, (str, unicode)):
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self.simpleElement("string", value)
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elif isinstance(value, bool):
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# must switch for bool before int, as bool is a
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# subclass of int...
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if value:
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self.simpleElement("true")
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else:
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self.simpleElement("false")
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elif isinstance(value, int):
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self.simpleElement("integer", str(value))
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elif isinstance(value, float):
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# should perhaps use repr() for better precision?
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self.simpleElement("real", str(value))
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elif isinstance(value, (dict, Dict)):
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self.writeDict(value)
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elif isinstance(value, Data):
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self.writeData(value)
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elif isinstance(value, Date):
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self.simpleElement("date", value.toString())
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elif isinstance(value, (tuple, list)):
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self.writeArray(value)
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else:
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raise TypeError("unsuported type: %s" % type(value))
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def writeData(self, data):
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self.beginElement("data")
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for line in data.asBase64().split("\n"):
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if line:
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self.writeln(line)
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self.endElement("data")
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def writeDict(self, d):
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self.beginElement("dict")
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items = d.items()
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items.sort()
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for key, value in items:
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if not isinstance(key, (str, unicode)):
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raise TypeError("keys must be strings")
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self.simpleElement("key", key)
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self.writeValue(value)
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self.endElement("dict")
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def writeArray(self, array):
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self.beginElement("array")
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for value in array:
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self.writeValue(value)
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self.endElement("array")
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class Dict:
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"""Dict wrapper for convenient access of values through attributes."""
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def __init__(self, **kwargs):
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self.__dict__.update(kwargs)
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def __cmp__(self, other):
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if isinstance(other, self.__class__):
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return cmp(self.__dict__, other.__dict__)
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elif isinstance(other, dict):
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return cmp(self.__dict__, other)
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else:
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return cmp(id(self), id(other))
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def __str__(self):
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return "%s(**%s)" % (self.__class__.__name__, self.__dict__)
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__repr__ = __str__
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def copy(self):
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return self.__class__(**self.__dict__)
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def __getattr__(self, attr):
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"""Delegate everything else to the dict object."""
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return getattr(self.__dict__, attr)
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class Plist(Dict):
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"""The main Plist object. Basically a dict (the toplevel object
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of a plist is a dict) with two additional methods to read from
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and write to files.
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"""
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def fromFile(cls, pathOrFile):
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didOpen = 0
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if isinstance(pathOrFile, (str, unicode)):
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pathOrFile = open(pathOrFile)
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didOpen = 1
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p = PlistParser()
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plist = p.parse(pathOrFile)
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if didOpen:
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pathOrFile.close()
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return plist
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fromFile = classmethod(fromFile)
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def write(self, pathOrFile):
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if isinstance(pathOrFile, (str, unicode)):
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pathOrFile = open(pathOrFile, "w")
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didOpen = 1
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else:
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didOpen = 0
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writer = PlistWriter(pathOrFile)
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writer.writeln("<plist version=\"1.0\">")
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writer.writeDict(self.__dict__)
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writer.writeln("</plist>")
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if didOpen:
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pathOrFile.close()
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class Data:
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"""Wrapper for binary data."""
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def __init__(self, data):
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self.data = data
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def fromBase64(cls, data):
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import base64
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return cls(base64.decodestring(data))
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fromBase64 = classmethod(fromBase64)
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def asBase64(self):
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import base64
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return base64.encodestring(self.data)
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def __cmp__(self, other):
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if isinstance(other, self.__class__):
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return cmp(self.data, other.data)
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elif isinstance(other, str):
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return cmp(self.data, other)
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else:
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return cmp(id(self), id(other))
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def __repr__(self):
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return "%s(%s)" % (self.__class__.__name__, repr(self.data))
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class Date:
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"""Primitive date wrapper, uses time floats internally, is agnostic
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about time zones.
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"""
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def __init__(self, date):
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if isinstance(date, str):
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from xml.utils.iso8601 import parse
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date = parse(date)
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self.date = date
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def toString(self):
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from xml.utils.iso8601 import tostring
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return tostring(self.date)
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def __cmp__(self, other):
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if isinstance(other, self.__class__):
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return cmp(self.date, other.date)
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elif isinstance(other, (int, float)):
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return cmp(self.date, other)
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else:
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return cmp(id(self), id(other))
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def __repr__(self):
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return "%s(%s)" % (self.__class__.__name__, repr(self.toString()))
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class PlistParser:
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def __init__(self):
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self.stack = []
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self.currentKey = None
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self.root = None
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def parse(self, file):
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from xml.parsers.expat import ParserCreate
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parser = ParserCreate()
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parser.StartElementHandler = self.handleBeginElement
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parser.EndElementHandler = self.handleEndElement
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parser.CharacterDataHandler = self.handleData
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parser.ParseFile(file)
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return self.root
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def handleBeginElement(self, element, attrs):
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self.data = []
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handler = getattr(self, "begin_" + element, None)
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if handler is not None:
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handler(attrs)
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def handleEndElement(self, element):
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handler = getattr(self, "end_" + element, None)
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if handler is not None:
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handler()
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def handleData(self, data):
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self.data.append(data)
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def addObject(self, value):
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if self.currentKey is not None:
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self.stack[-1][self.currentKey] = value
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self.currentKey = None
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elif not self.stack:
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# this is the root object
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assert self.root is value
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else:
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self.stack[-1].append(value)
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def getData(self):
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data = "".join(self.data)
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try:
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data = data.encode("ascii")
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except UnicodeError:
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pass
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self.data = []
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return data
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# element handlers
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def begin_dict(self, attrs):
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if self.root is None:
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self.root = d = Plist()
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else:
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d = Dict()
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self.addObject(d)
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self.stack.append(d)
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def end_dict(self):
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self.stack.pop()
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def end_key(self):
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self.currentKey = self.getData()
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def begin_array(self, attrs):
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a = []
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self.addObject(a)
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self.stack.append(a)
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def end_array(self):
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self.stack.pop()
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def end_true(self):
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self.addObject(True)
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def end_false(self):
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self.addObject(False)
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def end_integer(self):
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self.addObject(int(self.getData()))
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def end_real(self):
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self.addObject(float(self.getData()))
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def end_string(self):
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self.addObject(self.getData())
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def end_data(self):
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self.addObject(Data.fromBase64(self.getData()))
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def end_date(self):
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self.addObject(Date(self.getData()))
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# cruft to support booleans in Python <= 2.3
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import sys
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if sys.version_info[:2] < (2, 3):
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# Python 2.2 and earlier: no booleans
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# Python 2.2.x: booleans are ints
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class bool(int):
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"""Imitation of the Python 2.3 bool object."""
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def __new__(cls, value):
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return int.__new__(cls, not not value)
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def __repr__(self):
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if self:
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return "True"
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else:
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return "False"
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True = bool(1)
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False = bool(0)
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else:
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# Bind the boolean builtins to local names
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True = True
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False = False
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bool = bool
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if __name__ == "__main__":
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from StringIO import StringIO
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import time
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if len(sys.argv) == 1:
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pl = Plist(
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aString="Doodah",
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aList=["A", "B", 12, 32.1, [1, 2, 3]],
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aFloat = 0.1,
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anInt = 728,
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aDict=Dict(
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anotherString="<hello & hi there!>",
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aUnicodeValue=u'M\xe4ssig, Ma\xdf',
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aTrueValue=True,
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aFalseValue=False,
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),
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someData = Data("<binary gunk>"),
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someMoreData = Data("<lots of binary gunk>" * 10),
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aDate = Date(time.mktime(time.gmtime())),
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)
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elif len(sys.argv) == 2:
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pl = Plist.fromFile(sys.argv[1])
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else:
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print "Too many arguments: at most 1 plist file can be given."
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sys.exit(1)
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# unicode keys are possible, but a little awkward to use:
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pl[u'\xc5benraa'] = "That was a unicode key."
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f = StringIO()
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pl.write(f)
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xml = f.getvalue()
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print xml
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f.seek(0)
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pl2 = Plist.fromFile(f)
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assert pl == pl2
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f = StringIO()
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pl2.write(f)
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assert xml == f.getvalue()
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#print repr(pl2)
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