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""" A library for performing interesting tasks with DOM objects. """ from io import StringIO from twisted.web import microdom from twisted.web.microdom import getElementsByTagName, escape, unescape # These modules are imported here as a shortcut. escape getElementsByTagName class NodeLookupError(Exception): pass def substitute(request, node, subs): """ Look through the given node's children for strings, and attempt to do string substitution with the given parameter. """ for child in node.childNodes: if hasattr(child, 'nodeValue') and child.nodeValue: child.replaceData(0, len(child.nodeValue), child.nodeValue % subs) substitute(request, child, subs) def _get(node, nodeId, nodeAttrs=('id','class','model','pattern')): """ (internal) Get a node with the specified C{nodeId} as any of the C{class}, C{id} or C{pattern} attributes. """ if hasattr(node, 'hasAttributes') and node.hasAttributes(): for nodeAttr in nodeAttrs: if (str (node.getAttribute(nodeAttr)) == nodeId): return node if node.hasChildNodes(): if hasattr(node.childNodes, 'length'): length = node.childNodes.length else: length = len(node.childNodes) for childNum in range(length): result = _get(node.childNodes[childNum], nodeId) if result: return result def get(node, nodeId): """ Get a node with the specified C{nodeId} as any of the C{class}, C{id} or C{pattern} attributes. If there is no such node, raise L{NodeLookupError}. """ result = _get(node, nodeId) if result: return result raise NodeLookupError(nodeId) def getIfExists(node, nodeId): """ Get a node with the specified C{nodeId} as any of the C{class}, C{id} or C{pattern} attributes. If there is no such node, return L{None}. """ return _get(node, nodeId) def getAndClear(node, nodeId): """Get a node with the specified C{nodeId} as any of the C{class}, C{id} or C{pattern} attributes. If there is no such node, raise L{NodeLookupError}. Remove all child nodes before returning. """ result = get(node, nodeId) if result: clearNode(result) return result def clearNode(node): """ Remove all children from the given node. """ node.childNodes[:] = [] def locateNodes(nodeList, key, value, noNesting=1): """ Find subnodes in the given node where the given attribute has the given value. """ returnList = [] if not isinstance(nodeList, type([])): return locateNodes(nodeList.childNodes, key, value, noNesting) for childNode in nodeList: if not hasattr(childNode, 'getAttribute'): continue if str(childNode.getAttribute(key)) == value: returnList.append(childNode) if noNesting: continue returnList.extend(locateNodes(childNode, key, value, noNesting)) return returnList def superSetAttribute(node, key, value): if not hasattr(node, 'setAttribute'): return node.setAttribute(key, value) if node.hasChildNodes(): for child in node.childNodes: superSetAttribute(child, key, value) def superPrependAttribute(node, key, value): if not hasattr(node, 'setAttribute'): return old = node.getAttribute(key) if old: node.setAttribute(key, value+'/'+old) else: node.setAttribute(key, value) if node.hasChildNodes(): for child in node.childNodes: superPrependAttribute(child, key, value) def superAppendAttribute(node, key, value): if not hasattr(node, 'setAttribute'): return old = node.getAttribute(key) if old: node.setAttribute(key, old + '/' + value) else: node.setAttribute(key, value) if node.hasChildNodes(): for child in node.childNodes: superAppendAttribute(child, key, value) def gatherTextNodes(iNode, dounescape=0, joinWith=""): """Visit each child node and collect its text data, if any, into a string. For example:: >>> doc=microdom.parseString('1234') >>> gatherTextNodes(doc.documentElement) '1234' With dounescape=1, also convert entities back into normal characters. @return: the gathered nodes as a single string @rtype: str """ gathered=[] gathered_append=gathered.append slice=[iNode] while len(slice)>0: c=slice.pop(0) if hasattr(c, 'nodeValue') and c.nodeValue is not None: if dounescape: val=unescape(c.nodeValue) else: val=c.nodeValue gathered_append(val) slice[:0]=c.childNodes return joinWith.join(gathered) class RawText(microdom.Text): """This is an evil and horrible speed hack. Basically, if you have a big chunk of XML that you want to insert into the DOM, but you don't want to incur the cost of parsing it, you can construct one of these and insert it into the DOM. This will most certainly only work with microdom as the API for converting nodes to xml is different in every DOM implementation. This could be improved by making this class a Lazy parser, so if you inserted this into the DOM and then later actually tried to mutate this node, it would be parsed then. """ def writexml(self, writer, indent="", addindent="", newl="", strip=0, nsprefixes=None, namespace=None): writer.write("%s%s%s" % (indent, self.data, newl)) def findNodes(parent, matcher, accum=None): if accum is None: accum = [] if not parent.hasChildNodes(): return accum for child in parent.childNodes: # print child, child.nodeType, child.nodeName if matcher(child): accum.append(child) findNodes(child, matcher, accum) return accum def findNodesShallowOnMatch(parent, matcher, recurseMatcher, accum=None): if accum is None: accum = [] if not parent.hasChildNodes(): return accum for child in parent.childNodes: # print child, child.nodeType, child.nodeName if matcher(child): accum.append(child) if recurseMatcher(child): findNodesShallowOnMatch(child, matcher, recurseMatcher, accum) return accum def findNodesShallow(parent, matcher, accum=None): if accum is None: accum = [] if not parent.hasChildNodes(): return accum for child in parent.childNodes: if matcher(child): accum.append(child) else: findNodes(child, matcher, accum) return accum def findElementsWithAttributeShallow(parent, attribute): """ Return an iterable of the elements which are direct children of C{parent} and which have the C{attribute} attribute. """ return findNodesShallow(parent, lambda n: getattr(n, 'tagName', None) is not None and n.hasAttribute(attribute)) def findElements(parent, matcher): """ Return an iterable of the elements which are children of C{parent} for which the predicate C{matcher} returns true. """ return findNodes( parent, lambda n, matcher=matcher: getattr(n, 'tagName', None) is not None and matcher(n)) def findElementsWithAttribute(parent, attribute, value=None): if value: return findElements( parent, lambda n, attribute=attribute, value=value: n.hasAttribute(attribute) and n.getAttribute(attribute) == value) else: return findElements( parent, lambda n, attribute=attribute: n.hasAttribute(attribute)) def findNodesNamed(parent, name): return findNodes(parent, lambda n, name=name: n.nodeName == name) def writeNodeData(node, oldio): for subnode in node.childNodes: if hasattr(subnode, 'data'): oldio.write(u"" + subnode.data) else: writeNodeData(subnode, oldio) def getNodeText(node): oldio = StringIO() writeNodeData(node, oldio) return oldio.getvalue() def getParents(node): l = [] while node: l.append(node) node = node.parentNode return l def namedChildren(parent, nodeName): """namedChildren(parent, nodeName) -> children (not descendants) of parent that have tagName == nodeName """ return [n for n in parent.childNodes if getattr(n, 'tagName', '')==nodeName]