--- /dev/null
+#! /usr/bin/env python
+"""XML Virtual FileSystem for Midnight Commander
+
+The script requires Midnight Commander 3.1+
+(http://www.midnight-commander.org/), Python 2.4+ (http://www.python.org/).
+
+For mc 4.7+ put the script in $HOME/[.local/share/].mc/extfs.d.
+For older versions put it in /usr/[local/][lib|share]/mc/extfs
+and add a line "xml" to the /usr/[local/][lib|share]/mc/extfs/extfs.ini.
+Make the script executable.
+
+For mc 4.7+ run this "cd" command in the Midnight Commander (in the "bindings"
+file the command is "%cd"): cd file/xml://; In older versions it is
+cd file#xml, where "file" is the name of your XML file.
+
+The VFS represents tags as directories; the directories are numbered to
+distinguish tags with the same name; also numbering helps to sort tags by their
+order in XML instead of sorting them by name. Attributes, text nodes and
+comments are represented as text files; attributes are shown in a file named
+"attributes", attributes are listed in the file as name=value lines (I
+deliberately ignore a small chance of newline characters in values); names and
+values are reencoded to the console encoding. Text nodes and comments are
+collected in a file named "text", stripped and reencoded. The filesystem is
+read-only. ElementTree- and lxml.etree-based implementations don't show
+namespaces as attributes.
+
+It is useful to have a top-down view on an XML structure but it's especially
+convenient to extract text values from tags. One can get, for example, a
+base64-encoded image - just walk down the VFS to the tag's directory and copy
+its text file to a real file.
+
+The VFS was inspired by a FUSE xmlfs: https://github.com/halhen/xmlfs
+
+"""
+
+__version__ = "0.5.0"
+__author__ = "Oleg Broytman <phd@phdru.name>"
+__copyright__ = "Copyright (C) 2013 PhiloSoft Design"
+__license__ = "GPL"
+
+default_implementation = None # Can be None for default choice,
+ # 'lxml', 'elementtree' or 'minidom'
+
+use_minidom = True
+use_elementtree = False
+use_lxml = False
+
+import math
+import sys
+import xml.dom.minidom
+
+try:
+ import xml.etree.ElementTree as ET
+except ImportError:
+ pass
+else:
+ use_elementtree = True
+
+try:
+ import lxml.etree as etree
+except ImportError:
+ pass
+else:
+ use_lxml = True
+
+try:
+ import locale
+ use_locale = True
+except ImportError:
+ use_locale = False
+
+if use_locale:
+ # Get the default charset.
+ try:
+ lcAll = locale.getdefaultlocale()
+ except locale.Error, err:
+ print >>sys.stderr, "WARNING:", err
+ lcAll = []
+
+ if len(lcAll) == 2:
+ default_encoding = lcAll[1]
+ else:
+ try:
+ default_encoding = locale.getpreferredencoding()
+ except locale.Error, err:
+ print >>sys.stderr, "WARNING:", err
+ default_encoding = sys.getdefaultencoding()
+else:
+ default_encoding = sys.getdefaultencoding()
+
+import logging
+logger = logging.getLogger('xml-mcextfs')
+log_err_handler = logging.StreamHandler(sys.stderr)
+logger.addHandler(log_err_handler)
+logger.setLevel(logging.INFO)
+
+if len(sys.argv) < 3:
+ logger.critical("""\
+XML Virtual FileSystem for Midnight Commander version %s
+Author: %s
+%s
+
+This is not a program. Put the script in $HOME/[.local/share/].mc/extfs.d or
+/usr/[local/][lib|share]/mc/extfs. For more information read the source!""",
+ __version__, __author__, __copyright__
+)
+ sys.exit(1)
+
+
+locale.setlocale(locale.LC_ALL, '')
+
+
+class XmlVfs(object):
+ def __init__(self):
+ self.parse()
+
+ def list(self):
+ self._list(self.getroot())
+
+ def get_child_node(self, node, i):
+ n = 0
+ for element in self.getchildren(node):
+ if self.istag(element):
+ n += 1
+ if n == i:
+ return element
+ xml_error('There are less than %d nodes' % i)
+
+
+class MiniDOMXmlVfs(XmlVfs):
+ def parse(self):
+ self.document = xml.dom.minidom.parse(sys.argv[2])
+
+ def hasattrs(self, node):
+ return bool(node.attributes)
+
+ def attrs2text(self, node):
+ attrs = node.attributes
+ attrs = [attrs.item(i) for i in range (attrs.length)]
+ return '\n'.join(["%s=%s" %
+ (a.name.encode(default_encoding, "replace"),
+ a.value.encode(default_encoding, "replace"))
+ for a in attrs])
+
+ def collect_text(self, node):
+ text_accumulator = []
+ for element in node.childNodes:
+ if element.localName:
+ continue
+ elif element.nodeType == element.COMMENT_NODE:
+ text = u"<!--%s-->" % element.nodeValue
+ elif element.nodeType == element.TEXT_NODE:
+ text = element.nodeValue.strip()
+ else:
+ xml_error("Unknown node type %d" % element.nodeType)
+ if text: text_accumulator.append(text)
+ return '\n'.join(text_accumulator).encode(default_encoding, "replace")
+
+ def _list(self, node, path=''):
+ childNodes = node.childNodes
+ n = 0
+ for element in childNodes:
+ if element.localName:
+ n += 1
+ if n:
+ width = int(math.log10(n))+1
+ template = "%%0%dd" % width
+ else:
+ template = "%d"
+ n = 0
+ for element in childNodes:
+ if element.localName:
+ n += 1
+ if path:
+ subpath = '%s/%s %s' % (path, template % n, element.localName)
+ else:
+ subpath = '%s %s' % (template % n, element.localName)
+ subpath_encoded = subpath.encode(default_encoding, "replace")
+ print "dr-xr-xr-x 1 user group 0 Jan 1 00:00 %s" % subpath_encoded
+ if self.hasattrs(element):
+ attr_text = self.attrs2text(element)
+ print "-r--r--r-- 1 user group %d Jan 1 00:00 %s/attributes" % (
+ len(attr_text), subpath_encoded)
+ text = self.collect_text(element)
+ if text:
+ print "-r--r--r-- 1 user group %d Jan 1 00:00 %s/text" % (
+ len(text), subpath_encoded)
+ self._list(element, subpath)
+
+ def getroot(self):
+ return self.document
+
+ def getchildren(self, node):
+ return node.childNodes
+
+ def istag(self, node):
+ return bool(node.localName)
+
+
+if use_elementtree or use_lxml:
+ class CommonEtreeXmlVfs(XmlVfs):
+ def hasattrs(self, node):
+ return bool(node.attrib)
+
+ def collect_text(self, node):
+ text_accumulator = []
+ if node.text:
+ text = node.text.strip()
+ if text: text_accumulator.append(text)
+ for element in node:
+ if not self.istag(element):
+ text = u"<!--%s-->" % text
+ text_accumulator.append(text)
+ if node.tail:
+ text = node.tail.strip()
+ if text: text_accumulator.append(text)
+ return '\n'.join(text_accumulator).encode(default_encoding, "replace")
+
+ def getroot(self):
+ return self.document.getroot()
+
+ def getchildren(self, node):
+ return list(node)
+
+ def istag(self, node):
+ return isinstance(node.tag, basestring)
+
+
+if use_elementtree:
+ class ElementTreeXmlVfs(CommonEtreeXmlVfs):
+ def parse(self):
+ # Copied from http://effbot.org/zone/element-pi.ht
+
+ class PIParser(ET.XMLTreeBuilder):
+
+ def __init__(self):
+ ET.XMLTreeBuilder.__init__(self)
+ # assumes ElementTree 1.2.X
+ self._parser.CommentHandler = self.handle_comment
+ self._parser.ProcessingInstructionHandler = self.handle_pi
+ self._target.start("document", {})
+
+ def close(self):
+ self._target.end("document")
+ return ET.XMLTreeBuilder.close(self)
+
+ def handle_comment(self, data):
+ self._target.start(ET.Comment, {})
+ self._target.data(data)
+ self._target.end(ET.Comment)
+
+ def handle_pi(self, target, data):
+ self._target.start(ET.PI, {})
+ self._target.data(target + " " + data)
+ self._target.end(ET.PI)
+
+ self.document = ET.parse(sys.argv[2], PIParser())
+
+ def attrs2text(self, node):
+ attr_accumulator = []
+ for name, value in node.attrib.items():
+ name = name.encode(default_encoding, "replace")
+ value = value.encode(default_encoding, "replace")
+ if name.startswith('{'):
+ name = name.split('}', 1)[1] # Remove XML namespace
+ attr_accumulator.append("%s=%s" % (name, value))
+ return '\n'.join(attr_accumulator)
+
+ def _list(self, node, path=''):
+ n = len(node)
+ if n:
+ width = int(math.log10(n))+1
+ template = "%%0%dd" % width
+ else:
+ template = "%d"
+ n = 0
+ for element in node:
+ if not isinstance(element.tag, basestring):
+ continue
+ n += 1
+ tag = element.tag
+ if tag.startswith('{'):
+ tag = tag.split('}', 1)[1] # Remove XML namespace
+ if path:
+ subpath = '%s/%s %s' % (path, template % n, tag)
+ else:
+ subpath = '%s %s' % (template % n, tag)
+ subpath_encoded = subpath.encode(default_encoding, "replace")
+ print "dr-xr-xr-x 1 user group 0 Jan 1 00:00 %s" % subpath_encoded
+ if self.hasattrs(element):
+ attr_text = self.attrs2text(element)
+ print "-r--r--r-- 1 user group %d Jan 1 00:00 %s/attributes" % (
+ len(attr_text), subpath_encoded)
+ text = self.collect_text(element)
+ if text:
+ print "-r--r--r-- 1 user group %d Jan 1 00:00 %s/text" % (
+ len(text), subpath_encoded)
+ self._list(element, subpath)
+
+
+if use_lxml:
+ class LxmlEtreeXmlVfs(CommonEtreeXmlVfs):
+ def parse(self):
+ self.document = etree.parse(sys.argv[2])
+
+ def attrs2text(self, node):
+ attr_accumulator = []
+ for name, value in node.attrib.items():
+ name = etree.QName(name).localname.encode(default_encoding, "replace")
+ value = value.encode(default_encoding, "replace")
+ attr_accumulator.append("%s=%s" % (name, value))
+ return '\n'.join(attr_accumulator)
+
+ def list(self):
+ self._list(self.getroot())
+
+ def _list(self, node, path=''):
+ n = len(node)
+ if n:
+ width = int(math.log10(n))+1
+ template = "%%0%dd" % width
+ else:
+ template = "%d"
+ n = 0
+ for element in node:
+ if not isinstance(element.tag, basestring):
+ continue
+ n += 1
+ tag = etree.QName(element.tag).localname
+ if path:
+ subpath = '%s/%s %s' % (path, template % n, tag)
+ else:
+ subpath = '%s %s' % (template % n, tag)
+ subpath_encoded = subpath.encode(default_encoding, "replace")
+ print "dr-xr-xr-x 1 user group 0 Jan 1 00:00 %s" % subpath_encoded
+ if self.hasattrs(element):
+ attr_text = self.attrs2text(element)
+ print "-r--r--r-- 1 user group %d Jan 1 00:00 %s/attributes" % (
+ len(attr_text), subpath_encoded)
+ text = self.collect_text(element)
+ if text:
+ print "-r--r--r-- 1 user group %d Jan 1 00:00 %s/text" % (
+ len(text), subpath_encoded)
+ self._list(element, subpath)
+
+ def getroot(self):
+ return [self.document.getroot()]
+
+
+def build_xmlvfs():
+ if default_implementation is None:
+ if use_lxml:
+ return LxmlEtreeXmlVfs()
+ elif use_elementtree:
+ return ElementTreeXmlVfs()
+ else:
+ return MiniDOMXmlVfs()
+ elif default_implementation == 'minidom':
+ return MiniDOMXmlVfs()
+ elif default_implementation == 'elementtree':
+ return ElementTreeXmlVfs()
+ elif default_implementation == 'lxml':
+ return LxmlEtreeXmlVfs()
+
+
+def mcxml_list():
+ """List the entire VFS"""
+
+ xmlvfs = build_xmlvfs()
+ xmlvfs.list()
+
+
+def mcxml_copyout():
+ """Extract a file from the VFS"""
+
+ xmlvfs = build_xmlvfs()
+ xml_filename = sys.argv[3]
+ real_filename = sys.argv[4]
+
+ node = xmlvfs.getroot()
+ for path_comp in xml_filename.split('/'):
+ if ' ' in path_comp:
+ i = int(path_comp.split(' ', 1)[0])
+ node = xmlvfs.get_child_node(node, i)
+ elif path_comp in ('attributes', 'text'):
+ break
+ else:
+ xml_error('Unknown file')
+
+ if path_comp == 'attributes':
+ if xmlvfs.hasattrs(node):
+ text = xmlvfs.attrs2text(node)
+ else:
+ xml_error('There are no attributes')
+
+ if path_comp == 'text':
+ text = xmlvfs.collect_text(node)
+
+ outfile = open(real_filename, 'w')
+ outfile.write(text)
+ outfile.close()
+
+
+def mcxml_copyin():
+ """Put a file to the VFS"""
+ sys.exit("XML VFS doesn't support adding files (read-only filesystem)")
+
+def mcxml_rm():
+ """Remove a file from the VFS"""
+ sys.exit("XML VFS doesn't support removing files/directories (read-only filesystem)")
+
+mcxml_rmdir = mcxml_rm
+
+def mcxml_mkdir():
+ """Create a directory in the VFS"""
+ sys.exit("XML VFS doesn't support creating directories (read-only filesystem)")
+
+
+def xml_error(error_str):
+ logger.critical("Error walking XML file: %s", error_str)
+ sys.exit(1)
+
+command = sys.argv[1]
+procname = "mcxml_" + command
+
+g = globals()
+if not g.has_key(procname):
+ logger.critical("Unknown command %s", command)
+ sys.exit(1)
+
+try:
+ g[procname]()
+except SystemExit:
+ raise
+except:
+ logger.exception("Error during run")
projects / extfs.d.git / blobdiff