text: #!/usr/bin/env python
  #
  # Copyright (c) 2010 The SCons Foundation
  #
  # 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.
  #
  #
  # Module for handling SCons documentation processing.
  #
  from __future__ import print_function
  
  __doc__ = """
  This module parses home-brew XML files that document various things
  in SCons.  Right now, it handles Builders, functions, construction
  variables, and Tools, but we expect it to get extended in the future.
  
  In general, you can use any DocBook tag in the input, and this module
  just adds processing various home-brew tags to try to make life a
  little easier.
  
  Builder example:
  
      <builder name="BUILDER">
      <summary>
      <para>This is the summary description of an SCons Builder.
      It will get placed in the man page,
      and in the appropriate User's Guide appendix.
      The name of any builder may be interpolated
      anywhere in the document by specifying the
      &b-BUILDER; element.  It need not be on a line by itself.</para>
  
      Unlike normal XML, blank lines are significant in these
      descriptions and serve to separate paragraphs.
      They'll get replaced in DocBook output with appropriate tags
      to indicate a new paragraph.
  
      <example>
      print("this is example code, it will be offset and indented")
      </example>
      </summary>
      </builder>
  
  Function example:
  
      <scons_function name="FUNCTION">
      <arguments>
      (arg1, arg2, key=value)
      </arguments>
      <summary>
      <para>This is the summary description of an SCons function.
      It will get placed in the man page,
      and in the appropriate User's Guide appendix.
      The name of any builder may be interpolated
      anywhere in the document by specifying the
      &f-FUNCTION; element.  It need not be on a line by itself.</para>
  
      <example>
      print("this is example code, it will be offset and indented")
      </example>
      </summary>
      </scons_function>
  
  Construction variable example:
  
      <cvar name="VARIABLE">
      <summary>
      <para>This is the summary description of a construction variable.
      It will get placed in the man page,
      and in the appropriate User's Guide appendix.
      The name of any construction variable may be interpolated
      anywhere in the document by specifying the
      &t-VARIABLE; element.  It need not be on a line by itself.</para>
  
      <example>
      print("this is example code, it will be offset and indented")
      </example>
      </summary>
      </cvar>
  
  Tool example:
  
      <tool name="TOOL">
      <summary>
      <para>This is the summary description of an SCons Tool.
      It will get placed in the man page,
      and in the appropriate User's Guide appendix.
      The name of any tool may be interpolated
      anywhere in the document by specifying the
      &t-TOOL; element. It need not be on a line by itself.</para>
  
      <example>
      print("this is example code, it will be offset and indented")
      </example>
      </summary>
      </tool>
  """
  
  import os.path
  import re
  import sys
  import copy
  
  # Do we have libxml2/libxslt/lxml?
  has_libxml2 = True
  try:
      import libxml2
      import libxslt
  except:
      has_libxml2 = False
      try:
          import lxml
      except:
          raise ImportError("Failed to import either libxml2/libxslt or lxml")
  
  has_etree = False
  if not has_libxml2:
      try:
          from lxml import etree
          has_etree = True
      except ImportError:
          pass
  if not has_etree:
      try:
          # Python 2.5
          import xml.etree.cElementTree as etree
      except ImportError:
          try:
              # Python 2.5
              import xml.etree.ElementTree as etree
          except ImportError:
              try:
                  # normal cElementTree install
                  import cElementTree as etree
              except ImportError:
                  try:
                      # normal ElementTree install
                      import elementtree.ElementTree as etree
                  except ImportError:
                      raise ImportError("Failed to import ElementTree from any known place")
  
  re_entity = re.compile("\&([^;]+);")
  re_entity_header = re.compile("<!DOCTYPE\s+sconsdoc\s+[^\]]+\]>")
  
  # Namespace for the SCons Docbook XSD
  dbxsd="http://www.scons.org/dbxsd/v1.0"
  # Namespace map identifier for the SCons Docbook XSD
  dbxid="dbx"
  # Namespace for schema instances
  xsi = "http://www.w3.org/2001/XMLSchema-instance"
  
  # Header comment with copyright
  copyright_comment = """
  __COPYRIGHT__
  
  This file is processed by the bin/SConsDoc.py module.
  See its __doc__ string for a discussion of the format.
  """
  
  def isSConsXml(fpath):
      """ Check whether the given file is a SCons XML file, i.e. it
          contains the default target namespace definition.
      """
      try:
          with open(fpath,'r') as f:
              content = f.read()
          if content.find('xmlns="%s"' % dbxsd) >= 0:
              return True
      except:
          pass
  
      return False
  
  def remove_entities(content):
      # Cut out entity inclusions
      content = re_entity_header.sub("", content, re.M)
      # Cut out entities themselves
      content = re_entity.sub(lambda match: match.group(1), content)
  
      return content
  
  default_xsd = os.path.join('doc','xsd','scons.xsd')
  
  ARG = "dbscons"
  
  class Libxml2ValidityHandler:
  
      def __init__(self):
          self.errors = []
          self.warnings = []
  
      def error(self, msg, data):
          if data != ARG:
              raise Exception("Error handler did not receive correct argument")
          self.errors.append(msg)
  
      def warning(self, msg, data):
          if data != ARG:
              raise Exception("Warning handler did not receive correct argument")
          self.warnings.append(msg)
  
  
  class DoctypeEntity:
      def __init__(self, name_, uri_):
          self.name = name_
          self.uri = uri_
  
      def getEntityString(self):
          txt = """    <!ENTITY %(perc)s %(name)s SYSTEM "%(uri)s">
      %(perc)s%(name)s;
  """ % {'perc' : perc, 'name' : self.name, 'uri' : self.uri}
  
          return txt
  
  class DoctypeDeclaration:
      def __init__(self, name_=None):
          self.name = name_
          self.entries = []
          if self.name is None:
              # Add default entries
              self.name = "sconsdoc"
              self.addEntity("scons", "../scons.mod")
              self.addEntity("builders-mod", "builders.mod")
              self.addEntity("functions-mod", "functions.mod")
              self.addEntity("tools-mod", "tools.mod")
              self.addEntity("variables-mod", "variables.mod")
  
      def addEntity(self, name, uri):
          self.entries.append(DoctypeEntity(name, uri))
  
      def createDoctype(self):
          content = '<!DOCTYPE %s [\n' % self.name
          for e in self.entries:
              content += e.getEntityString()
          content += ']>\n'
  
          return content
  
  if not has_libxml2:
      class TreeFactory:
          def __init__(self):
              pass
  
          def newNode(self, tag):
              return etree.Element(tag)
  
          def newEtreeNode(self, tag, init_ns=False):
              if init_ns:
                  NSMAP = {None: dbxsd,
                           'xsi' : xsi}
                  return etree.Element(tag, nsmap=NSMAP)
  
              return etree.Element(tag)
  
          def copyNode(self, node):
              return copy.deepcopy(node)
  
          def appendNode(self, parent, child):
              parent.append(child)
  
          def hasAttribute(self, node, att):
              return att in node.attrib
  
          def getAttribute(self, node, att):
              return node.attrib[att]
  
          def setAttribute(self, node, att, value):
              node.attrib[att] = value
  
          def getText(self, root):
              return root.text
  
          def setText(self, root, txt):
              root.text = txt
  
          def writeGenTree(self, root, fp):
              dt = DoctypeDeclaration()
              fp.write(etree.tostring(root, xml_declaration=True,
                                      encoding="UTF-8", pretty_print=True,
                                      doctype=dt.createDoctype()))
  
          def writeTree(self, root, fpath):
              with open(fpath, 'w') as fp:
                  fp.write(etree.tostring(root, xml_declaration=True,
                                          encoding="UTF-8", pretty_print=True))
  
          def prettyPrintFile(self, fpath):
              with open(fpath,'r') as fin:
                  tree = etree.parse(fin)
                  pretty_content = etree.tostring(tree, pretty_print=True)
  
              with open(fpath,'w') as fout:
                  fout.write(pretty_content)
  
          def decorateWithHeader(self, root):
              root.attrib["{"+xsi+"}schemaLocation"] = "%s %s/scons.xsd" % (dbxsd, dbxsd)
              return root
  
          def newXmlTree(self, root):
              """ Return a XML file tree with the correct namespaces set,
                  the element root as top entry and the given header comment.
              """
              NSMAP = {None: dbxsd,
                       'xsi' : xsi}
              t = etree.Element(root, nsmap=NSMAP)
              return self.decorateWithHeader(t)
  
          def validateXml(self, fpath, xmlschema_context):
              # Use lxml
              xmlschema = etree.XMLSchema(xmlschema_context)
              try:
                  doc = etree.parse(fpath)
              except Exception as e:
                  print("ERROR: %s fails to parse:"%fpath)
                  print(e)
                  return False
              doc.xinclude()
              try:
                  xmlschema.assertValid(doc)
              except Exception as e:
                  print("ERROR: %s fails to validate:" % fpath)
                  print(e)
                  return False
              return True
  
          def findAll(self, root, tag, ns=None, xp_ctxt=None, nsmap=None):
              expression = ".//{%s}%s" % (nsmap[ns], tag)
              if not ns or not nsmap:
                  expression = ".//%s" % tag
              return root.findall(expression)
  
          def findAllChildrenOf(self, root, tag, ns=None, xp_ctxt=None, nsmap=None):
              expression = "./{%s}%s/*" % (nsmap[ns], tag)
              if not ns or not nsmap:
                  expression = "./%s/*" % tag
              return root.findall(expression)
  
          def convertElementTree(self, root):
              """ Convert the given tree of etree.Element
                  entries to a list of tree nodes for the
                  current XML toolkit.
              """
              return [root]
  
  else:
      class TreeFactory:
          def __init__(self):
              pass
  
          def newNode(self, tag):
              return libxml2.newNode(tag)
  
          def newEtreeNode(self, tag, init_ns=False):
              return etree.Element(tag)
  
          def copyNode(self, node):
              return node.copyNode(1)
  
          def appendNode(self, parent, child):
              if hasattr(parent, 'addChild'):
                  parent.addChild(child)
              else:
                  parent.append(child)
  
          def hasAttribute(self, node, att):
              if hasattr(node, 'hasProp'):
                  return node.hasProp(att)
              return att in node.attrib
  
          def getAttribute(self, node, att):
              if hasattr(node, 'prop'):
                  return node.prop(att)
              return node.attrib[att]
  
          def setAttribute(self, node, att, value):
              if hasattr(node, 'setProp'):
                  node.setProp(att, value)
              else:
                  node.attrib[att] = value
  
          def getText(self, root):
              if hasattr(root, 'getContent'):
                  return root.getContent()
              return root.text
  
          def setText(self, root, txt):
              if hasattr(root, 'setContent'):
                  root.setContent(txt)
              else:
                  root.text = txt
  
          def writeGenTree(self, root, fp):
              doc = libxml2.newDoc('1.0')
              dtd = doc.newDtd("sconsdoc", None, None)
              doc.addChild(dtd)
              doc.setRootElement(root)
              content = doc.serialize("UTF-8", 1)
              dt = DoctypeDeclaration()
              # This is clearly a hack, but unfortunately libxml2
              # doesn't support writing PERs (Parsed Entity References).
              # So, we simply replace the empty doctype with the
              # text we need...
              content = content.replace("<!DOCTYPE sconsdoc>", dt.createDoctype())
              fp.write(content)
              doc.freeDoc()
  
          def writeTree(self, root, fpath):
              with open(fpath, 'w') as fp:
                  doc = libxml2.newDoc('1.0')
                  doc.setRootElement(root)
                  fp.write(doc.serialize("UTF-8", 1))
                  doc.freeDoc()
  
          def prettyPrintFile(self, fpath):
              # Read file and resolve entities
              doc = libxml2.readFile(fpath, None, libxml2d.XML_PARSE_NOENT)
              with open(fpath, 'w') as fp:
                  # Prettyprint
                  fp.write(doc.serialize("UTF-8", 1))
              # Cleanup
              doc.freeDoc()
  
          def decorateWithHeader(self, root):
              # Register the namespaces
              ns = root.newNs(dbxsd, None)
              xi = root.newNs(xsi, 'xsi')
              root.setNs(ns)  #put this node in the target namespace
  
              root.setNsProp(xi, 'schemaLocation', "%s %s/scons.xsd" % (dbxsd, dbxsd))
  
              return root
  
          def newXmlTree(self, root):
              """ Return a XML file tree with the correct namespaces set,
                  the element root as top entry and the given header comment.
              """
              t = libxml2.newNode(root)
              return self.decorateWithHeader(t)
  
          def validateXml(self, fpath, xmlschema_context):
              retval = True
  
              # Create validation context
              validation_context = xmlschema_context.schemaNewValidCtxt()
              # Set error/warning handlers
              eh = Libxml2ValidityHandler()
              validation_context.setValidityErrorHandler(eh.error, eh.warning, ARG)
              # Read file and resolve entities
              doc = libxml2.readFile(fpath, None, libxml2.XML_PARSE_NOENT)
              doc.xincludeProcessFlags(libxml2.XML_PARSE_NOENT)
              err = validation_context.schemaValidateDoc(doc)
  
              if err or eh.errors:
                  for e in eh.errors:
                      print(e.rstrip("\n"))
                  # import pdb; pdb.set_trace()
                  print("%s fails to validate" % fpath)
                  retval = False
  
              # Cleanup
              doc.freeDoc()
              del validation_context
  
              return retval
  
          def findAll(self, root, tag, ns=None, xpath_context=None, nsmap=None):
              if hasattr(root, 'xpathEval') and xpath_context:
                  # Use the xpath context
                  xpath_context.setContextNode(root)
                  expression = ".//%s" % tag
                  if ns:
                      expression = ".//%s:%s" % (ns, tag)
                  return xpath_context.xpathEval(expression)
              else:
                  expression = ".//{%s}%s" % (nsmap[ns], tag)
                  if not ns or not nsmap:
                      expression = ".//%s" % tag
                  return root.findall(expression)
  
          def findAllChildrenOf(self, root, tag, ns=None, xpath_context=None, nsmap=None):
              if hasattr(root, 'xpathEval') and xpath_context:
                  # Use the xpath context
                  xpath_context.setContextNode(root)
                  expression = "./%s/node()" % tag
                  if ns:
                      expression = "./%s:%s/node()" % (ns, tag)
  
                  return xpath_context.xpathEval(expression)
              else:
                  expression = "./{%s}%s/node()" % (nsmap[ns], tag)
                  if not ns or not nsmap:
                      expression = "./%s/node()" % tag
                  return root.findall(expression)
  
          def expandChildElements(self, child):
              """ Helper function for convertElementTree,
                  converts a single child recursively.
              """
              nchild = self.newNode(child.tag)
              # Copy attributes
              for key, val in child.attrib:
                  self.setAttribute(nchild, key, val)
              elements = []
              # Add text
              if child.text:
                  t = libxml2.newText(child.text)
                  self.appendNode(nchild, t)
              # Add children
              for c in child:
                  for n in self.expandChildElements(c):
                      self.appendNode(nchild, n)
              elements.append(nchild)
              # Add tail
              if child.tail:
                  tail = libxml2.newText(child.tail)
                  elements.append(tail)
  
              return elements
  
          def convertElementTree(self, root):
              """ Convert the given tree of etree.Element
                  entries to a list of tree nodes for the
                  current XML toolkit.
              """
              nroot = self.newNode(root.tag)
              # Copy attributes
              for key, val in root.attrib:
                  self.setAttribute(nroot, key, val)
              elements = []
              # Add text
              if root.text:
                  t = libxml2.newText(root.text)
                  self.appendNode(nroot, t)
              # Add children
              for c in root:
                  for n in self.expandChildElements(c):
                      self.appendNode(nroot, n)
              elements.append(nroot)
              # Add tail
              if root.tail:
                  tail = libxml2.newText(root.tail)
                  elements.append(tail)
  
              return elements
  
  tf = TreeFactory()
  
  
  class SConsDocTree:
      def __init__(self):
          self.nsmap = {'dbx' : dbxsd}
          self.doc = None
          self.root = None
          self.xpath_context = None
  
      def parseContent(self, content, include_entities=True):
          """ Parses the given content as XML file. This method
              is used when we generate the basic lists of entities
              for the builders, tools and functions.
              So we usually don't bother about namespaces and resolving
              entities here...this is handled in parseXmlFile below
              (step 2 of the overall process).
          """
          if not include_entities:
              content = remove_entities(content)
          # Create domtree from given content string
          self.root = etree.fromstring(content)
  
      def parseXmlFile(self, fpath):
          nsmap = {'dbx' : dbxsd}
          if not has_libxml2:
              # Create domtree from file
              domtree = etree.parse(fpath)
              self.root = domtree.getroot()
          else:
              # Read file and resolve entities
              self.doc = libxml2.readFile(fpath, None, libxml2.XML_PARSE_NOENT)
              self.root = self.doc.getRootElement()
              # Create xpath context
              self.xpath_context = self.doc.xpathNewContext()
              # Register namespaces
              for key, val in self.nsmap.items():
                  self.xpath_context.xpathRegisterNs(key, val)
  
      def __del__(self):
          if self.doc is not None:
              self.doc.freeDoc()
          if self.xpath_context is not None:
              self.xpath_context.xpathFreeContext()
  
  perc="%"
  
  def validate_all_xml(dpaths, xsdfile=default_xsd):
      xmlschema_context = None
      if not has_libxml2:
          # Use lxml
          xmlschema_context = etree.parse(xsdfile)
      else:
          # Use libxml2 and prepare the schema validation context
          ctxt = libxml2.schemaNewParserCtxt(xsdfile)
          xmlschema_context = ctxt.schemaParse()
          del ctxt
  
      fpaths = []
      for dp in dpaths:
          if dp.endswith('.xml') and isSConsXml(dp):
              path='.'
              fpaths.append(dp)
          else:
              for path, dirs, files in os.walk(dp):
                  for f in files:
                      if f.endswith('.xml'):
                          fp = os.path.join(path, f)
                          if isSConsXml(fp):
                              fpaths.append(fp)
  
      fails = []
      for idx, fp in enumerate(fpaths):
          fpath = os.path.join(path, fp)
          print("%.2f%s (%d/%d) %s" % (float(idx+1)*100.0/float(len(fpaths)),
                                       perc, idx+1, len(fpaths),fp))
  
          if not tf.validateXml(fp, xmlschema_context):
              fails.append(fp)
              continue
  
      if has_libxml2:
          # Cleanup
          del xmlschema_context
  
      if fails:
          return False
  
      return True
  
  class Item(object):
      def __init__(self, name):
          self.name = name
          self.sort_name = name.lower()
          if self.sort_name[0] == '_':
              self.sort_name = self.sort_name[1:]
          self.sets = []
          self.uses = []
          self.summary = None
          self.arguments = None
      def cmp_name(self, name):
          if name[0] == '_':
              name = name[1:]
          return name.lower()
      def __eq__(self, other):
          return self.sort_name == other.sort_name
      def __lt__(self, other):
          return self.sort_name < other.sort_name
  
  class Builder(Item):
      pass
  
  class Function(Item):
      def __init__(self, name):
          super(Function, self).__init__(name)
  
  class Tool(Item):
      def __init__(self, name):
          Item.__init__(self, name)
          self.entity = self.name.replace('+', 'X')
  
  class ConstructionVariable(Item):
      pass
  
  class Arguments(object):
      def __init__(self, signature, body=None):
          if not body:
              body = []
          self.body = body
          self.signature = signature
      def __str__(self):
          s = ''.join(self.body).strip()
          result = []
          for m in re.findall('([a-zA-Z/_]+|[^a-zA-Z/_]+)', s):
              if ' ' in m:
                  m = '"%s"' % m
              result.append(m)
          return ' '.join(result)
      def append(self, data):
          self.body.append(data)
  
  class SConsDocHandler(object):
      def __init__(self):
          self.builders = {}
          self.functions = {}
          self.tools = {}
          self.cvars = {}
  
      def parseItems(self, domelem, xpath_context, nsmap):
          items = []
  
          for i in tf.findAll(domelem, "item", dbxid, xpath_context, nsmap):
              txt = tf.getText(i)
              if txt is not None:
                  txt = txt.strip()
                  if len(txt):
                      items.append(txt.strip())
  
          return items
  
      def parseUsesSets(self, domelem, xpath_context, nsmap):
          uses = []
          sets = []
  
          for u in tf.findAll(domelem, "uses", dbxid, xpath_context, nsmap):
              uses.extend(self.parseItems(u, xpath_context, nsmap))
          for s in tf.findAll(domelem, "sets", dbxid, xpath_context, nsmap):
              sets.extend(self.parseItems(s, xpath_context, nsmap))
  
          return sorted(uses), sorted(sets)
  
      def parseInstance(self, domelem, map, Class,
                          xpath_context, nsmap, include_entities=True):
          name = 'unknown'
          if tf.hasAttribute(domelem, 'name'):
              name = tf.getAttribute(domelem, 'name')
          try:
              instance = map[name]
          except KeyError:
              instance = Class(name)
              map[name] = instance
          uses, sets = self.parseUsesSets(domelem, xpath_context, nsmap)
          instance.uses.extend(uses)
          instance.sets.extend(sets)
          if include_entities:
              # Parse summary and function arguments
              for s in tf.findAllChildrenOf(domelem, "summary", dbxid, xpath_context, nsmap):
                  if instance.summary is None:
                      instance.summary = []
                  instance.summary.append(tf.copyNode(s))
              for a in tf.findAll(domelem, "arguments", dbxid, xpath_context, nsmap):
                  if instance.arguments is None:
                      instance.arguments = []
                  instance.arguments.append(tf.copyNode(a))
  
      def parseDomtree(self, root, xpath_context=None, nsmap=None, include_entities=True):
          # Process Builders
          for b in tf.findAll(root, "builder", dbxid, xpath_context, nsmap):
              self.parseInstance(b, self.builders, Builder,
                                 xpath_context, nsmap, include_entities)
          # Process Functions
          for f in tf.findAll(root, "scons_function", dbxid, xpath_context, nsmap):
              self.parseInstance(f, self.functions, Function,
                                 xpath_context, nsmap, include_entities)
          # Process Tools
          for t in tf.findAll(root, "tool", dbxid, xpath_context, nsmap):
              self.parseInstance(t, self.tools, Tool,
                                 xpath_context, nsmap, include_entities)
          # Process CVars
          for c in tf.findAll(root, "cvar", dbxid, xpath_context, nsmap):
              self.parseInstance(c, self.cvars, ConstructionVariable,
                                 xpath_context, nsmap, include_entities)
  
      def parseContent(self, content, include_entities=True):
          """ Parses the given content as XML file. This method
              is used when we generate the basic lists of entities
              for the builders, tools and functions.
              So we usually don't bother about namespaces and resolving
              entities here...this is handled in parseXmlFile below
              (step 2 of the overall process).
          """
          # Create doctree
          t = SConsDocTree()
          t.parseContent(content, include_entities)
          # Parse it
          self.parseDomtree(t.root, t.xpath_context, t.nsmap, include_entities)
  
      def parseXmlFile(self, fpath):
          # Create doctree
          t = SConsDocTree()
          t.parseXmlFile(fpath)
          # Parse it
          self.parseDomtree(t.root, t.xpath_context, t.nsmap)
  
  # lifted from Ka-Ping Yee's way cool pydoc module.
  if sys.version_info[0] == 2:
      def importfile(path):
          """Import a Python source file or compiled file given its path."""
          import imp
          magic = imp.get_magic()
          with open(path, 'r') as ifp:
              if ifp.read(len(magic)) == magic:
                  kind = imp.PY_COMPILED
              else:
                  kind = imp.PY_SOURCE
          filename = os.path.basename(path)
          name, ext = os.path.splitext(filename)
          with open(path, 'r') as ifp:
              try:
                  module = imp.load_module(name, ifp, path, (ext, 'r', kind))
              except ImportError as e:
                  sys.stderr.write("Could not import %s: %s\n" % (path, e))
                  return None
          return module
  
  else:  # PY3 version, from newer pydoc
      def importfile(path):
          """Import a Python source file or compiled file given its path."""
          import importlib
          from pydoc import ErrorDuringImport
          magic = importlib.util.MAGIC_NUMBER
          with open(path, 'rb') as ifp:
              is_bytecode = magic == ifp.read(len(magic))
          filename = os.path.basename(path)
          name, ext = os.path.splitext(filename)
          if is_bytecode:
              loader = importlib._bootstrap_external.SourcelessFileLoader(name, path)
          else:
              loader = importlib._bootstrap_external.SourceFileLoader(name, path)
          # XXX We probably don't need to pass in the loader here.
          spec = importlib.util.spec_from_file_location(name, path, loader=loader)
          try:
              return importlib._bootstrap._load(spec)
          except:
              raise ErrorDuringImport(path, sys.exc_info())
  
  # Local Variables:
  # tab-width:4
  # indent-tabs-mode:nil
  # End:
  # vim: set expandtab tabstop=4 shiftwidth=4:
  