1 files changed, 139 insertions, 0 deletions
diff --git a/src/scons/Node/FS.py b/src/scons/Node/FS.py
new file mode 100644
index 0000000..7640a7a
--- /dev/null
+++ b/src/scons/Node/FS.py
@@ -0,0 +1,139 @@
+"""scons.Node.FS
+
+File system nodes.
+
+"""
+
+__revision__ = "Node/FS.py __REVISION__ __DATE__ __DEVELOPER__"
+
+
+
+import os
+import os.path
+from scons.Node import 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(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(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)