mirror of
https://github.com/Sneed-Group/Poodletooth-iLand
synced 2024-12-26 13:12:30 -06:00
371 lines
12 KiB
Python
371 lines
12 KiB
Python
|
""" This module reimplements Python's file I/O mechanisms using Panda
|
||
|
|
constructs. This enables Python to interface more easily with Panda's
|
||
|
|
virtual file system, and it also better-supports Panda's
|
||
|
|
SIMPLE_THREADS model, by avoiding blocking all threads while waiting
|
||
|
|
for I/O to complete. """
|
||
|
|
|
||
|
|
__all__ = [
|
||
|
|
'file', 'open', 'listdir', 'walk', 'join',
|
||
|
|
'isfile', 'isdir', 'exists', 'lexists', 'getmtime', 'getsize',
|
||
|
|
'execfile',
|
||
|
|
]
|
||
|
|
|
||
|
|
from pandac import PandaModules as pm
|
||
|
|
import types
|
||
|
|
|
||
|
|
_vfs = pm.VirtualFileSystem.getGlobalPtr()
|
||
|
|
|
||
|
|
class file:
|
||
|
|
def __init__(self, filename, mode = 'r', bufsize = None,
|
||
|
|
autoUnwrap = False):
|
||
|
|
self.__stream = None
|
||
|
|
self.__needsVfsClose = False
|
||
|
|
self.__reader = None
|
||
|
|
self.__writer = None
|
||
|
|
self.closed = True
|
||
|
|
self.encoding = None
|
||
|
|
self.errors = None
|
||
|
|
self.__lastWrite = False
|
||
|
|
|
||
|
|
self.mode = mode
|
||
|
|
self.name = None
|
||
|
|
self.filename = None
|
||
|
|
self.newlines = None
|
||
|
|
self.softspace = False
|
||
|
|
|
||
|
|
readMode = False
|
||
|
|
writeMode = False
|
||
|
|
|
||
|
|
if isinstance(filename, pm.Istream) or isinstance(filename, pm.Ostream):
|
||
|
|
# If we were given a stream instead of a filename, assign
|
||
|
|
# it directly.
|
||
|
|
self.__stream = filename
|
||
|
|
readMode = isinstance(filename, pm.Istream)
|
||
|
|
writeMode = isinstance(filename, pm.Ostream)
|
||
|
|
|
||
|
|
elif isinstance(filename, pm.VirtualFile):
|
||
|
|
# We can also "open" a VirtualFile object for reading.
|
||
|
|
self.__stream = filename.openReadFile(autoUnwrap)
|
||
|
|
if not self.__stream:
|
||
|
|
message = 'Could not read virtual file %s' % (repr(filename))
|
||
|
|
raise IOError, message
|
||
|
|
self.__needsVfsClose = True
|
||
|
|
readMode = True
|
||
|
|
|
||
|
|
else:
|
||
|
|
# Otherwise, we must have been given a filename. Open it.
|
||
|
|
if isinstance(filename, types.StringTypes):
|
||
|
|
# If a raw string is given, assume it's an os-specific
|
||
|
|
# filename.
|
||
|
|
filename = pm.Filename.fromOsSpecific(filename)
|
||
|
|
else:
|
||
|
|
# If a Filename is given, make a writable copy anyway.
|
||
|
|
filename = pm.Filename(filename)
|
||
|
|
|
||
|
|
self.filename = filename
|
||
|
|
self.name = filename.toOsSpecific()
|
||
|
|
|
||
|
|
binary = False
|
||
|
|
if 'b' in mode:
|
||
|
|
# Strip 'b'. This means a binary file.
|
||
|
|
i = mode.index('b')
|
||
|
|
mode = mode[:i] + mode[i + 1:]
|
||
|
|
binary = True
|
||
|
|
|
||
|
|
if 'U' in mode:
|
||
|
|
# Strip 'U'. We don't use it; universal-newline support
|
||
|
|
# is built into Panda, and can't be changed at runtime.
|
||
|
|
i = mode.index('U')
|
||
|
|
mode = mode[:i] + mode[i + 1:]
|
||
|
|
binary = False
|
||
|
|
|
||
|
|
if mode == '':
|
||
|
|
mode = 'r'
|
||
|
|
|
||
|
|
# Per Python docs, we insist this is true.
|
||
|
|
assert mode[0] in 'rwa'
|
||
|
|
|
||
|
|
if binary:
|
||
|
|
filename.setBinary()
|
||
|
|
else:
|
||
|
|
filename.setText()
|
||
|
|
|
||
|
|
# Actually open the streams.
|
||
|
|
if mode == 'w':
|
||
|
|
self.__stream = _vfs.openWriteFile(filename, autoUnwrap, True)
|
||
|
|
if not self.__stream:
|
||
|
|
message = 'Could not open %s for writing' % (filename)
|
||
|
|
raise IOError, message
|
||
|
|
writeMode = True
|
||
|
|
|
||
|
|
elif mode == 'a':
|
||
|
|
self.__stream = _vfs.openAppendFile(filename)
|
||
|
|
if not self.__stream:
|
||
|
|
message = 'Could not open %s for writing' % (filename)
|
||
|
|
raise IOError, message
|
||
|
|
writeMode = True
|
||
|
|
|
||
|
|
elif mode == 'w+':
|
||
|
|
self.__stream = _vfs.openReadWriteFile(filename, True)
|
||
|
|
if not self.__stream:
|
||
|
|
message = 'Could not open %s for writing' % (filename)
|
||
|
|
raise IOError, message
|
||
|
|
readMode = True
|
||
|
|
writeMode = True
|
||
|
|
|
||
|
|
elif mode == 'a+':
|
||
|
|
self.__stream = _vfs.openReadAppendFile(filename)
|
||
|
|
if not self.__stream:
|
||
|
|
message = 'Could not open %s for writing' % (filename)
|
||
|
|
raise IOError, message
|
||
|
|
readMode = True
|
||
|
|
writeMode = True
|
||
|
|
|
||
|
|
elif mode == 'r+':
|
||
|
|
self.__stream = _vfs.openReadWriteFile(filename, False)
|
||
|
|
if not self.__stream:
|
||
|
|
message = 'Could not open %s for writing' % (filename)
|
||
|
|
raise IOError, message
|
||
|
|
readMode = True
|
||
|
|
writeMode = True
|
||
|
|
|
||
|
|
elif mode == 'r':
|
||
|
|
self.__stream = _vfs.openReadFile(filename, autoUnwrap)
|
||
|
|
if not self.__stream:
|
||
|
|
if not _vfs.exists(filename):
|
||
|
|
message = 'No such file: %s' % (filename)
|
||
|
|
else:
|
||
|
|
message = 'Could not open %s for reading' % (filename)
|
||
|
|
raise IOError, message
|
||
|
|
readMode = True
|
||
|
|
|
||
|
|
self.__needsVfsClose = True
|
||
|
|
|
||
|
|
if readMode:
|
||
|
|
self.__reader = pm.StreamReader(self.__stream, False)
|
||
|
|
if writeMode:
|
||
|
|
self.__writer = pm.StreamWriter(self.__stream, False)
|
||
|
|
self.__lastWrite = True
|
||
|
|
|
||
|
|
def __del__(self):
|
||
|
|
self.close()
|
||
|
|
|
||
|
|
def close(self):
|
||
|
|
if self.__needsVfsClose:
|
||
|
|
if self.__reader and self.__writer:
|
||
|
|
_vfs.closeReadWriteFile(self.__stream)
|
||
|
|
elif self.__reader:
|
||
|
|
_vfs.closeReadFile(self.__stream)
|
||
|
|
else: # self.__writer:
|
||
|
|
_vfs.closeWriteFile(self.__stream)
|
||
|
|
|
||
|
|
self.__needsVfsClose = False
|
||
|
|
self.__stream = None
|
||
|
|
self.__needsVfsClose = False
|
||
|
|
self.__reader = None
|
||
|
|
self.__writer = None
|
||
|
|
|
||
|
|
def flush(self):
|
||
|
|
if self.__stream:
|
||
|
|
self.__stream.clear() # clear eof flag
|
||
|
|
self.__stream.flush()
|
||
|
|
|
||
|
|
def __iter__(self):
|
||
|
|
return self
|
||
|
|
|
||
|
|
def next(self):
|
||
|
|
line = self.readline()
|
||
|
|
if line:
|
||
|
|
return line
|
||
|
|
raise StopIteration
|
||
|
|
|
||
|
|
def read(self, size = -1):
|
||
|
|
if not self.__reader:
|
||
|
|
if not self.__writer:
|
||
|
|
# The stream is not even open at all.
|
||
|
|
message = 'I/O operation on closed file'
|
||
|
|
raise ValueError, message
|
||
|
|
# The stream is open only in write mode.
|
||
|
|
message = 'Attempt to read from write-only stream'
|
||
|
|
raise IOError, message
|
||
|
|
|
||
|
|
self.__stream.clear() # clear eof flag
|
||
|
|
self.__lastWrite = False
|
||
|
|
if size >= 0:
|
||
|
|
result = self.__reader.extractBytes(size)
|
||
|
|
else:
|
||
|
|
# Read to end-of-file.
|
||
|
|
result = ''
|
||
|
|
while not self.__stream.eof():
|
||
|
|
result += self.__reader.extractBytes(1024)
|
||
|
|
return result
|
||
|
|
|
||
|
|
def readline(self, size = -1):
|
||
|
|
if not self.__reader:
|
||
|
|
if not self.__writer:
|
||
|
|
# The stream is not even open at all.
|
||
|
|
message = 'I/O operation on closed file'
|
||
|
|
raise ValueError, message
|
||
|
|
# The stream is open only in write mode.
|
||
|
|
message = 'Attempt to read from write-only stream'
|
||
|
|
raise IOError, message
|
||
|
|
|
||
|
|
self.__stream.clear() # clear eof flag
|
||
|
|
self.__lastWrite = False
|
||
|
|
return self.__reader.readline()
|
||
|
|
|
||
|
|
def readlines(self, sizehint = -1):
|
||
|
|
lines = []
|
||
|
|
line = self.readline()
|
||
|
|
while line:
|
||
|
|
lines.append(line)
|
||
|
|
line = self.readline()
|
||
|
|
return lines
|
||
|
|
|
||
|
|
xreadlines = readlines
|
||
|
|
|
||
|
|
def seek(self, offset, whence = 0):
|
||
|
|
if self.__stream:
|
||
|
|
self.__stream.clear() # clear eof flag
|
||
|
|
if self.__reader:
|
||
|
|
self.__stream.seekg(offset, whence)
|
||
|
|
if self.__writer:
|
||
|
|
self.__stream.seekp(offset, whence)
|
||
|
|
|
||
|
|
def tell(self):
|
||
|
|
if self.__lastWrite:
|
||
|
|
if self.__writer:
|
||
|
|
return self.__stream.tellp()
|
||
|
|
else:
|
||
|
|
if self.__reader:
|
||
|
|
return self.__stream.tellg()
|
||
|
|
message = 'I/O operation on closed file'
|
||
|
|
raise ValueError, message
|
||
|
|
|
||
|
|
def truncate(self):
|
||
|
|
""" Sorry, this isn't supported by Panda's low-level I/O,
|
||
|
|
because it isn't supported by the standard C++ library. """
|
||
|
|
raise NotImplementedError
|
||
|
|
|
||
|
|
def write(self, str):
|
||
|
|
if not self.__writer:
|
||
|
|
if not self.__reader:
|
||
|
|
# The stream is not even open at all.
|
||
|
|
message = 'I/O operation on closed file'
|
||
|
|
raise ValueError, message
|
||
|
|
# The stream is open only in read mode.
|
||
|
|
message = 'Attempt to write to read-only stream'
|
||
|
|
raise IOError, message
|
||
|
|
|
||
|
|
self.__stream.clear() # clear eof flag
|
||
|
|
self.__writer.appendData(str)
|
||
|
|
self.__lastWrite = True
|
||
|
|
|
||
|
|
def writelines(self, lines):
|
||
|
|
if not self.__writer:
|
||
|
|
if not self.__reader:
|
||
|
|
# The stream is not even open at all.
|
||
|
|
message = 'I/O operation on closed file'
|
||
|
|
raise ValueError, message
|
||
|
|
# The stream is open only in read mode.
|
||
|
|
message = 'Attempt to write to read-only stream'
|
||
|
|
raise IOError, message
|
||
|
|
|
||
|
|
self.__stream.clear() # clear eof flag
|
||
|
|
for line in lines:
|
||
|
|
self.__writer.appendData(line)
|
||
|
|
self.__lastWrite = True
|
||
|
|
|
||
|
|
def __enter__(self):
|
||
|
|
return self
|
||
|
|
|
||
|
|
def __exit__(self, t, v, tb):
|
||
|
|
self.close()
|
||
|
|
|
||
|
|
open = file
|
||
|
|
|
||
|
|
def listdir(path):
|
||
|
|
""" Implements os.listdir over vfs. """
|
||
|
|
files = []
|
||
|
|
dirlist = _vfs.scanDirectory(pm.Filename.fromOsSpecific(path))
|
||
|
|
if dirlist is None:
|
||
|
|
message = 'No such file or directory: %s' % (path)
|
||
|
|
raise OSError, message
|
||
|
|
for file in dirlist:
|
||
|
|
files.append(file.getFilename().getBasename())
|
||
|
|
return files
|
||
|
|
|
||
|
|
def walk(top, topdown = True, onerror = None, followlinks = True):
|
||
|
|
""" Implements os.walk over vfs.
|
||
|
|
|
||
|
|
Note: we don't support onerror or followlinks; errors are ignored
|
||
|
|
and links are always followed. """
|
||
|
|
|
||
|
|
dirnames = []
|
||
|
|
filenames = []
|
||
|
|
|
||
|
|
dirlist = _vfs.scanDirectory(top)
|
||
|
|
if dirlist:
|
||
|
|
for file in dirlist:
|
||
|
|
if file.isDirectory():
|
||
|
|
dirnames.append(file.getFilename().getBasename())
|
||
|
|
else:
|
||
|
|
filenames.append(file.getFilename().getBasename())
|
||
|
|
|
||
|
|
if topdown:
|
||
|
|
yield (top, dirnames, filenames)
|
||
|
|
|
||
|
|
for dir in dirnames:
|
||
|
|
next = join(top, dir)
|
||
|
|
for tuple in walk(next, topdown = topdown):
|
||
|
|
yield tuple
|
||
|
|
|
||
|
|
if not topdown:
|
||
|
|
yield (top, dirnames, filenames)
|
||
|
|
|
||
|
|
def join(path, *args):
|
||
|
|
for part in args:
|
||
|
|
if part == '':
|
||
|
|
continue
|
||
|
|
|
||
|
|
if part.startswith('/'):
|
||
|
|
path = part
|
||
|
|
elif path.endswith('/'):
|
||
|
|
path = path + part
|
||
|
|
else:
|
||
|
|
path = '/'.join((path, part))
|
||
|
|
|
||
|
|
return path
|
||
|
|
|
||
|
|
def isfile(path):
|
||
|
|
return _vfs.isRegularFile(pm.Filename.fromOsSpecific(path))
|
||
|
|
|
||
|
|
def isdir(path):
|
||
|
|
return _vfs.isDirectory(pm.Filename.fromOsSpecific(path))
|
||
|
|
|
||
|
|
def exists(path):
|
||
|
|
return _vfs.exists(pm.Filename.fromOsSpecific(path))
|
||
|
|
|
||
|
|
def lexists(path):
|
||
|
|
return _vfs.exists(pm.Filename.fromOsSpecific(path))
|
||
|
|
|
||
|
|
def getmtime(path):
|
||
|
|
file = _vfs.getFile(pm.Filename.fromOsSpecific(path), True)
|
||
|
|
if not file:
|
||
|
|
raise os.error
|
||
|
|
return file.getTimestamp()
|
||
|
|
|
||
|
|
def getsize(path):
|
||
|
|
file = _vfs.getFile(pm.Filename.fromOsSpecific(path), True)
|
||
|
|
if not file:
|
||
|
|
raise os.error
|
||
|
|
return file.getFileSize()
|
||
|
|
|
||
|
|
def execfile(path, globals=None, locals=None):
|
||
|
|
file = _vfs.getFile(pm.Filename.fromOsSpecific(path), True)
|
||
|
|
if not file:
|
||
|
|
raise os.error
|
||
|
|
|
||
|
|
data = file.readFile(False)
|
||
|
|
exec(data, globals, locals)
|