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# This file (node.py) gets copied in several of my projects. Find out a way
# to avoid making duplicate copies in each of my projects.
import sys
class NodeType:
# unknown node type.
Unknown = 0
# the document root - typically has only one child element, but it can
# have multiple children.
Root = 1
# node that has name and attributes, and may have child nodes.
Element = 2
# node that only has textural content.
Content = 3
class NodeBase:
def __init__ (self, nodeType = NodeType.Unknown):
self.parent = None
self.nodeType = nodeType
self.__children = []
self.__hasContent = False
def appendChild (self, node):
self.__children.append(node)
node.parent = self
def appendElement (self, name):
node = Element(name)
self.appendChild(node)
return node
def hasContent (self):
return self.__hasContent
def appendContent (self, text):
node = Content(text)
self.appendChild(node)
self.__hasContent = True
return node
def firstChild (self):
return self.__children[0]
def setChildNodes (self, children):
self.__children = children
def getChildNodes (self):
return self.__children
def firstChildByName (self, name):
for child in self.__children:
if child.nodeType == NodeType.Element and child.name == name:
return child
return None
def getChildByName (self, name):
children = []
for child in self.__children:
if child.nodeType == NodeType.Element and child.name == name:
children.append(child)
return children
class Root(NodeBase):
def __init__ (self):
NodeBase.__init__(self, NodeType.Root)
class Content(NodeBase):
def __init__ (self, content):
NodeBase.__init__(self, NodeType.Content)
self.content = content
class Element(NodeBase):
def __init__ (self, name, attrs=None):
NodeBase.__init__(self, NodeType.Element)
self.name = name
self.attrs = attrs
if self.attrs == None:
self.attrs = {}
def getContent (self):
text = ''
first = True
for child in self.getChildNodes():
if first:
first = False
else:
text += ' '
if child.nodeType == NodeType.Content:
text += child.content
elif child.nodeType == NodeType.Element:
text += child.getContent()
return text
def getAttr (self, name):
if not self.attrs.has_key(name):
return None
return self.attrs[name]
def setAttr (self, name, val):
self.attrs[name] = val
def hasAttr (self, name):
return self.attrs.has_key(name)
encodeTable = {
'>': 'gt',
'<': 'lt',
'&': 'amp',
'"': 'quot',
'\'': 'apos'
}
def encodeString (sin):
sout = ''
for c in sin:
if ord(c) >= 128:
# encode non-ascii ranges.
sout += "\\x%2.2x"%ord(c)
elif encodeTable.has_key(c):
# encode html symbols.
sout += '&' + encodeTable[c] + ';'
else:
sout += c
return sout
def convertAttrValue (val):
if type(val) == type(True):
if val:
val = "true"
else:
val = "false"
elif type(val) == type(0):
val = "%d"%val
elif type(val) == type(0.0):
val = "%g"%val
return val
def prettyPrint (fd, node):
printNode(fd, node, 0, True)
def printNode (fd, node, level, breakLine):
singleIndent = ''
lf = ''
if breakLine:
singleIndent = ' '*4
lf = "\n"
indent = singleIndent*level
if node.nodeType == NodeType.Root:
# root node itself only contains child nodes.
for child in node.getChildNodes():
printNode(fd, child, level, True)
elif node.nodeType == NodeType.Element:
hasChildren = len(node.getChildNodes()) > 0
# We add '<' and '>' (or '/>') after the element content gets
# encoded.
line = node.name
if len(node.attrs) > 0:
keys = node.attrs.keys()
keys.sort()
for key in keys:
val = node.attrs[key]
if val == None:
continue
val = convertAttrValue(val)
line += " " + key + '="' + encodeString(val) + '"'
if hasChildren:
breakChildren = breakLine and not node.hasContent()
line = "<%s>"%line
if breakChildren:
line += "\n"
fd.write (indent + line)
for child in node.getChildNodes():
printNode(fd, child, level+1, breakChildren)
line = "</%s>%s"%(node.name, lf)
if breakChildren:
line = indent + line
fd.write (line)
else:
line = "<%s/>%s"%(line, lf)
fd.write (indent + line)
elif node.nodeType == NodeType.Content:
content = node.content
content = encodeString(content)
if len(content) > 0:
fd.write (indent + content + lf)
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