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########################################################################
# $Header: /var/local/cvsroot/4Suite/Ft/Lib/__init__.py,v 1.23 2005/03/06 06:39:32 mbrown Exp $
"""
Module providing common utilities for many 4Suite components,
as well as for general use.
Copyright 2005 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
import os
from Ft import FtException
class UriException(FtException):
"""
Exceptions used by the Uri module, and possibly others.
"""
INVALID_BASE_URI = 100
#RELATIVE_DOCUMENT_URI = 110
RELATIVE_BASE_URI = 111
OPAQUE_BASE_URI = 112
NON_FILE_URI = 120
UNIX_REMOTE_HOST_FILE_URI = 121
RESOURCE_ERROR = 130
SCHEME_REQUIRED = 200 # for SchemeRegistryResolver
UNSUPPORTED_SCHEME = 201
IDNA_UNSUPPORTED = 202
INVALID_PUBLIC_ID_URN = 300
UNSUPPORTED_PLATFORM = 1000
def __init__(self, errorCode, *args, **kwargs):
import MessageSource
self.params = args or (kwargs,)
self.errorCode = errorCode
messages = MessageSource.URI
msgargs = args or kwargs
self.message = messages[errorCode] % msgargs
Exception.__init__(self, self.message, args)
return
def Truncate(text, length):
"""
Returns text truncated to length, with "..." appended if truncation
was necessary.
"""
if len(text) > length:
return text[:length] + '...'
else:
return text[:length]
def Wrap(text, width):
r"""
A word-wrap function that preserves existing line breaks
and most spaces in the text. Expects that existing line
breaks are posix newlines (\n).
See also: Ft.Lib.CommandLine.CommandLineUtil.wrap_text()
"""
# http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/148061
return reduce(lambda line, word, width=width: '%s%s%s' %
(line,
' \n'[(len(line)-line.rfind('\n')-1
+ len(word.split('\n',1)[0]
) >= width)],
word),
text.split(' ')
)
def CloseStream(stream, quiet=False):
"""
Closes a stream, ignoring errors if quiet=True. If the stream is a
terminal (e.g. sys.stdin, stdout, stderr), does not attempt to close
the stream.
Closing terminal streams could interfere with subsequent read or
write attempts. For example, after calling sys.stdout.close(),
subsequent writes to stdout will not raise an exception, but may
also fail to actually write anything to stdout.
The stream argument can be any Python file-like object with a
close() method, such as a regular file object or an instance of
Ft.Xml.InputSource.InputSource (or subclass thereof).
"""
# get the actual stream
if hasattr(stream, 'stream'):
# given stream is probably an InputSource
raw_stream = stream.stream
else:
raw_stream = stream
# determine if it is a terminal; abort if it is
if hasattr(raw_stream, 'isatty') and raw_stream.isatty():
return
try:
# if an InputSource, let the InputSource close stream for us
# since subclasses can override the close method.
stream.close()
except:
if quiet:
pass
else:
raise
return
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