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"""SCons.Node.FS
File system nodes.
"""
__revision__ = "__FILE__ __REVISION__ __DATE__ __DEVELOPER__"
import os
import os.path
import SCons.Node
Top = None
Root = {}
def init(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.
"""
global Top
if path == None:
path = os.getcwd()
Top = lookup(Dir, path, directory = None)
Top.path = '.'
def lookup(fsclass, name, directory = Top):
"""Look up a file system node for a path name. If the path
name is relative, it will be looked up relative to the
specified directory node, or to the top-level directory
if no node was specified. An initial '#' specifies that
the name will be looked up relative to the top-level directory,
regardless of the specified directory argument. Returns the
existing or newly-created node for the specified path name.
The node returned will be of the specified fsclass (Dir or
File).
"""
global Top
head, tail = os.path.split(name)
if not tail:
drive, path = os.path.splitdrive(head)
if not Root.has_key(drive):
Root[drive] = Dir(head, None)
Root[drive].abspath = head
Root[drive].path = head
return Root[drive]
if tail[0] == '#':
directory = Top
tail = tail[1:]
elif directory is None:
directory = Top
if head:
directory = lookup(Dir, head, directory)
try:
self = directory.entries[tail]
except AttributeError:
# There was no "entries" attribute on the directory,
# which essentially implies that it was a file.
# Return it as a more descriptive exception.
raise TypeError, directory
except KeyError:
# There was to entry for "tail," so create the new
# node and link it in to the existing structure.
self = fsclass(tail, directory)
self.name = tail
if self.path[0:2] == "./":
self.path = self.path[2:]
directory.entries[tail] = self
except:
raise
if self.__class__.__name__ != fsclass.__name__:
# Here, we found an existing node for this path,
# but it was the wrong type (a File when we were
# looking for a Dir, or vice versa).
raise TypeError, self
return self
# XXX TODO?
# Annotate with the creator
# is_under
# rel_path
# srcpath / srcdir
# link / is_linked
# linked_targets
# is_accessible
class Dir(SCons.Node.Node):
"""A class for directories in a file system.
"""
def __init__(self, name, directory):
self.entries = {}
self.entries['.'] = self
self.entries['..'] = directory
if not directory is None:
self.abspath = os.path.join(directory.abspath, name, '')
self.path = os.path.join(directory.path, name, '')
def up(self):
return self.entries['..']
# 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(SCons.Node.Node):
"""A class for files in a file system.
"""
def __init__(self, name, directory):
self.abspath = os.path.join(directory.abspath, name)
self.path = os.path.join(directory.path, name)
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