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"""scons.Node.FS
File system nodes.
This initializes a "default_fs" Node with an FS at the current directory
for its own purposes, and for use by scripts or modules looking for the
canonical default.
"""
#
# Copyright (c) 2001 Steven Knight
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import os
import os.path
from SCons.Node import Node
from UserDict import UserDict
import sys
class PathName:
"""This is a string like object with limited capabilities (i.e.,
cannot always be used interchangeably with strings). This class
is used by PathDict to manage case-insensitive path names. It preserves
the case of the string with which it was created, but on OS's with
case insensitive paths, it will hash equal to any case of the same
path when placed in a dictionary."""
try:
convert_path = unicode
except NameError:
convert_path = str
def __init__(self, path_name=''):
self.data = PathName.convert_path(path_name)
self.norm_path = os.path.normcase(self.data)
def __hash__(self):
return hash(self.norm_path)
def __cmp__(self, other):
return cmp(self.norm_path,
os.path.normcase(PathName.convert_path(other)))
def __rcmp__(self, other):
return cmp(os.path.normcase(PathName.convert_path(other)),
self.norm_path)
def __str__(self):
return str(self.data)
def __repr__(self):
return repr(self.data)
class PathDict(UserDict):
"""This is a dictionary-like class meant to hold items keyed
by path name. The difference between this class and a normal
dictionary is that string or unicode keys will act differently
on OS's that have case-insensitive path names. Specifically
string or unicode keys of different case will be treated as
equal on the OS's.
All keys are implicitly converted to PathName objects before
insertion into the dictionary."""
def __init__(self, initdict = {}):
UserDict.__init__(self, initdict)
old_dict = self.data
self.data = {}
for key, val in old_dict.items():
self.data[PathName(key)] = val
def __setitem__(self, key, val):
self.data[PathName(key)] = val
def __getitem__(self, key):
return self.data[PathName(key)]
def __delitem__(self, key):
del(self.data[PathName(key)])
if not hasattr(UserDict, 'setdefault'):
def setdefault(self, key, value):
try:
return self.data[PathName(key)]
except KeyError:
self.data[PathName(key)] = value
return value
class FS:
def __init__(self, path = None):
"""Initialize the Node.FS subsystem.
The supplied path is the top of the source tree, where we
expect to find the top-level build file. If no path is
supplied, the current directory is the default.
The path argument must be a valid absolute path.
"""
if path == None:
path = os.getcwd()
self.Root = PathDict()
self.Top = self.__doLookup(Dir, path)
self.Top.path = '.'
def __doLookup(self, fsclass, name, directory=None):
"""This method differs from the File and Dir factory methods in
one important way: the meaning of the directory parameter.
In this method, if directory is None or not supplied, the supplied
name is expected to be an absolute path. If you try to look up a
relative path with directory=None, then an AssertionError will be
raised."""
head, tail = os.path.split(os.path.normpath(name))
if not tail:
# We have reached something that looks like a root
# of an absolute path. What we do here is a little
# weird. If we are on a UNIX system, everything is
# well and good, just return the root node.
#
# On DOS/Win32 things are strange, since a path
# starting with a slash is not technically an
# absolute path, but a path relative to the
# current drive. Therefore if we get a path like
# that, we will return the root Node of the
# directory parameter. If the directory parameter is
# None, raise an exception.
drive, tail = os.path.splitdrive(head)
if sys.platform is 'win32' and not drive:
if not directory:
raise OSError, 'No drive letter supplied for absolute path.'
return directory.root()
return self.Root.setdefault(drive, Dir(tail))
if head:
# Recursively look up our parent directories.
directory = self.__doLookup(Dir, head, directory)
else:
# This path looks like a relative path. No leading slash or drive
# letter. Therefore, we will look up this path relative to the
# supplied top-level directory.
assert directory, "Tried to lookup a node by relative path with no top-level directory supplied."
ret = directory.entries.setdefault(tail, fsclass(tail, directory))
if not isinstance(ret, fsclass):
raise TypeError, ret
return ret
def __transformPath(self, name, directory):
"""Take care of setting up the correct top-level directory,
usually in preparation for a call to doLookup().
If the path name is prepended with a '#', then it is unconditionally
interpreted as replative to the top-level directory of this FS.
If directory is None, and name is a relative path,
then the same applies.
"""
if name[0] == '#':
directory = self.Top
name = os.path.join(os.path.normpath('./'), name[1:])
elif not directory:
directory = self.Top
return (name, directory)
def File(self, name, directory = None):
"""Lookup or create a File node with the specified name. If
the name is a relative path (begins with ./, ../, or a file name),
then it is looked up relative to the supplied directory node,
or to the top level directory of the FS (supplied at construction
time) if no directory is supplied.
This method will raise TypeError if a directory is found at the
specified path.
"""
name, directory = self.__transformPath(name, directory)
return self.__doLookup(File, name, directory)
def Dir(self, name, directory = None):
"""Lookup or create a Dir node with the specified name. If
the name is a relative path (begins with ./, ../, or a file name),
then it is looked up relative to the supplied directory node,
or to the top level directory of the FS (supplied at construction
time) if no directory is supplied.
This method will raise TypeError if a normal file is found at the
specified path.
"""
name, directory = self.__transformPath(name, directory)
return self.__doLookup(Dir, name, directory)
# XXX TODO?
# Annotate with the creator
# is_under
# rel_path
# srcpath / srcdir
# link / is_linked
# linked_targets
# is_accessible
class Dir(Node):
"""A class for directories in a file system.
"""
def __init__(self, name, directory = None):
Node.__init__(self)
self.entries = PathDict()
self.entries['.'] = self
if directory:
self.entries['..'] = directory
self.abspath = os.path.join(directory.abspath, name, '')
if str(directory.path) == '.':
self.path = os.path.join(name, '')
else:
self.path = os.path.join(directory.path, name, '')
else:
self.abspath = self.path = name
self.entries['..'] = None
def __str__(self):
return self.path
def up(self):
return self.entries['..']
def root(self):
if not self.entries['..']:
return self
else:
return self.entries['..'].root()
def children(self):
return map(lambda x, s=self: s.entries[x],
filter(lambda k: k != '.' and k != '..',
self.entries.keys()))
# XXX TODO?
# rfile
# precious
# no_rfile
# rpath
# rsrcpath
# source_exists
# derived_exists
# is_on_rpath
# local
# base_suf
# suffix
# addsuffix
# accessible
# ignore
# build
# bind
# is_under
# relpath
class File(Node):
"""A class for files in a file system.
"""
def __init__(self, name, directory):
Node.__init__(self)
self.abspath = os.path.join(directory.abspath, name)
if str(directory.path) == '.':
self.path = name
else:
self.path = os.path.join(directory.path, name)
self.parent = directory
def __str__(self):
return self.path
def root(self):
return self.parent.root()
def get_contents(self):
return open(self.path, "r").read()
def get_timestamp(self):
return os.path.getmtime(self.path)
def exists(self):
return os.path.exists(self.path)
default_fs = FS()
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