Mercurial > libervia-backend
view src/tools/xml_tools.py @ 1005:b4af31a8a4f2
core (logs): added formatting, name filter and outputs management:
- formatting is inspired from, and use when possible, standard logging. "message", "levelname", and "name" are the only format managed, depending on backend more can be managed (standard backend formats are specified in official python logging doc)
- name filter use regular expressions. It's possible to log only plugins with SAT_LOG_LOGGER="^sat.plugins". To log only XEPs 96 & 65, we can use SAT_LOG_LOGGER='(xep_0095|xep_0065)'
- output management use a particular syntax:
- output handler are name with "//", so far there are "//default" (most of time stderr), "//memory" and "//file"
- options can be specified in parenthesis, e.g. "//memory(50)" mean a 50 lines memory buffer (50 is the current default, so that's equivalent to "//memory")
- several handlers can be specified: "//file(/tmp/sat.log)//default" will use the default logging + a the /tmp/sat.log file
- if there is only one handler, it use the file handler: "/tmp/sat.log" is the same as "//file(/tmp/sat.log)"
- not finished, need more work for twisted and basic backends
author | Goffi <goffi@goffi.org> |
---|---|
date | Mon, 05 May 2014 18:58:34 +0200 |
parents | 301b342c697a |
children | 35048cafb18d |
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#!/usr/bin/python # -*- coding: utf-8 -*- # SAT: a jabber client # Copyright (C) 2009, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. from sat.core.i18n import _ from sat.core.log import getLogger log = getLogger(__name__) from xml.dom import minidom, NotFoundErr from wokkel import data_form from twisted.words.xish import domish from sat.core import exceptions """This library help manage XML used in SàT (parameters, registration, etc) """ SAT_FORM_PREFIX = "SAT_FORM_" SAT_PARAM_SEPARATOR = "_XMLUI_PARAM_" # used to have unique elements names # Helper functions def _dataFormField2XMLUIData(field): """ Get data needed to create an XMLUI's Widget from Wokkel's data_form's Field field can be modified (if it's fixed and it has no value) @param field: data_form.Field (it uses field.value, field.fieldType, field.label and field.var) @return: widget_type, widget_args, widget_kwargs """ widget_args = [field.value] widget_kwargs = {} if field.fieldType == 'fixed' or field.fieldType is None: widget_type = 'text' if field.value is None: if field.label is None: log.warning(_("Fixed field has neither value nor label, ignoring it")) field.value = "" else: field.value = field.label field.label = None widget_args[0] = field.value elif field.fieldType == 'text-single': widget_type = "string" elif field.fieldType == 'text-private': widget_type = "password" elif field.fieldType == 'boolean': widget_type = "bool" if widget_args[0] is None: widget_args[0] = 'false' elif field.fieldType == 'list-single': widget_type = "list" del widget_args[0] widget_kwargs["options"] = [(option.value, option.label or option.value) for option in field.options] else: log.error(u"FIXME FIXME FIXME: Type [%s] is not managed yet by SàT" % field.fieldType) widget_type = "string" if field.var: widget_kwargs["name"] = field.var return widget_type, widget_args, widget_kwargs def dataForm2XMLUI(form, submit_id, session_id=None): """Take a data form (xep-0004, Wokkel's implementation) and convert it to a SàT XML @param submit_id: callback id to call when submitting form @param session_id: id to return with the data """ form_ui = XMLUI("form", "vertical", submit_id=submit_id, session_id=session_id) if form.instructions: form_ui.addText('\n'.join(form.instructions), 'instructions') form_ui.changeContainer("pairs") for field in form.fieldList: widget_type, widget_args, widget_kwargs = _dataFormField2XMLUIData(field) label = field.label or field.var if label: form_ui.addLabel(label) else: form_ui.addEmpty() form_ui.addWidget(widget_type, *widget_args, **widget_kwargs) return form_ui def dataFormResult2AdvancedList(xmlui, form_xml): """Take a raw data form (not parsed by XEP-0004) and convert it to an advanced list raw data form is used because Wokkel doesn't manage result items parsing yet @param xmlui: the XMLUI where the AdvancedList will be added @param form_xml: domish.Element of the data form @return: AdvancedList element """ headers = {} try: reported_elt = form_xml.elements('jabber:x:data', 'reported').next() except StopIteration: raise exceptions.DataError("Couldn't find expected <reported> tag") for elt in reported_elt.elements(): if elt.name != "field": raise exceptions.DataError("Unexpected tag") name = elt["var"] label = elt.attributes.get('label','') type_ = elt.attributes.get('type') headers[name] = (label, type_) if not headers: raise exceptions.DataError("No reported fields (see XEP-0004 §3.4)") adv_list = AdvancedListContainer(xmlui, headers=headers, columns=len(headers), parent=xmlui.current_container) xmlui.changeContainer(adv_list) item_elts = form_xml.elements('jabber:x:data', 'item') for item_elt in item_elts: for elt in item_elt.elements(): if elt.name != 'field': log.warning("Unexpected tag (%s)" % elt.name) continue field = data_form.Field.fromElement(elt) widget_type, widget_args, widget_kwargs = _dataFormField2XMLUIData(field) xmlui.addWidget(widget_type, *widget_args, **widget_kwargs) return xmlui def dataFormResult2XMLUI(form_xml, session_id=None): """Take a raw data form (not parsed by XEP-0004) and convert it to a SàT XMLUI raw data form is used because Wokkel doesn't manage result items parsing yet @param form_xml: domish.Element of the data form @return: XMLUI interface """ xmlui = XMLUI("window", "vertical", session_id=session_id) dataFormResult2AdvancedList(xmlui, form_xml) return xmlui def _cleanValue(value): """Workaround method to avoid DBus types with D-Bus bridge @param value: value to clean @return: value in a non DBus type (only clean string yet) """ # XXX: must be removed when DBus types will no cause problems anymore # FIXME: should be cleaned inside D-Bus bridge itself if isinstance(value, basestring): return unicode(value) return value def XMLUIResult2DataFormResult(xmlui_data): """ Extract form data from a XMLUI return @xmlui_data: data returned by frontends for XMLUI form @return: dict of data usable by Wokkel's dataform """ return {key[len(SAT_FORM_PREFIX):]: _cleanValue(value) for key, value in xmlui_data.iteritems() if key.startswith(SAT_FORM_PREFIX)} def formEscape(name): """ Return escaped name for forms """ return u"%s%s" % (SAT_FORM_PREFIX, name) def XMLUIResultToElt(xmlui_data): """ Construct result domish.Element from XMLUI result @xmlui_data: data returned by frontends for XMLUI form """ form = data_form.Form('submit') form.makeFields(XMLUIResult2DataFormResult(xmlui_data)) return form.toElement() def tupleList2dataForm(values): """convert a list of tuples (name,value) to a wokkel submit data form""" form = data_form.Form('submit') for value in values: field = data_form.Field(var=value[0], value=value[1]) form.addField(field) return form def paramsXML2XMLUI(xml): """Convert the xml for parameter to a SàT XML User Interface""" params_doc = minidom.parseString(xml.encode('utf-8')) top = params_doc.documentElement if top.nodeName != 'params': raise exceptions.DataError(_('INTERNAL ERROR: parameters xml not valid')) param_ui = XMLUI("param", "tabs") tabs_cont = param_ui.current_container for category in top.getElementsByTagName("category"): category_name = category.getAttribute('name') label = category.getAttribute('label') if not category_name: raise exceptions.DataError(_('INTERNAL ERROR: params categories must have a name')) tabs_cont.addTab(category_name, label=label, container=PairsContainer) for param in category.getElementsByTagName("param"): widget_kwargs = {} param_name = param.getAttribute('name') param_label = param.getAttribute('label') type_ = param.getAttribute('type') if not param_name and type_ != 'text': raise exceptions.DataError(_('INTERNAL ERROR: params must have a name')) value = param.getAttribute('value') or None callback_id = param.getAttribute('callback_id') or None if type_ == 'list': options, selected = _getParamListOptions(param) widget_kwargs['options'] = options widget_kwargs['selected'] = selected if type_ in ("button", "text"): param_ui.addEmpty() value = param_label else: param_ui.addLabel(param_label or param_name) if value: widget_kwargs["value"] = value if callback_id: widget_kwargs['callback_id'] = callback_id widget_kwargs['name'] = "%s%s%s" % (category_name, SAT_PARAM_SEPARATOR, param_name) param_ui.addWidget(type_, **widget_kwargs) return param_ui.toXml() def _getParamListOptions(param): """Retrieve the options for list element. The <option/> tags must be direct children of <param/>.""" if len(param.getElementsByTagName("options")) > 0: raise exceptions.DataError(_("The 'options' tag is not allowed in parameter of type 'list'!")) elems = param.getElementsByTagName("option") if len(elems) == 0: return [] options = [elem.getAttribute("value") for elem in elems] selected = [elem.getAttribute("value") for elem in elems if elem.getAttribute("selected") == 'true'] return (options, selected) ## XMLUI Elements class Element(object): """ Base XMLUI element """ type = None def __init__(self, xmlui, parent=None): """Create a container element @param xmlui: XMLUI instance @parent: parent element """ assert(self.type) is not None if not hasattr(self, 'elem'): self.elem = parent.xmlui.doc.createElement(self.type) self.xmlui = xmlui if parent is not None: parent.append(self) self.parent = parent def append(self, child): self.elem.appendChild(child.elem) child.parent = self class TopElement(Element): """ Main XML Element """ type = 'top' def __init__(self, xmlui): self.elem = xmlui.doc.documentElement super(TopElement, self).__init__(xmlui) class TabElement(Element): """ Used by TabsContainer to give name and label to tabs """ type = 'tab' def __init__(self, parent, name, label): if not isinstance(parent, TabsContainer): raise exceptions.DataError(_("TabElement must be a child of TabsContainer")) super(TabElement, self).__init__(parent.xmlui, parent) self.elem.setAttribute('name', name) self.elem.setAttribute('label', label) class FieldBackElement(Element): """ Used by ButtonWidget to indicate which field have to be sent back """ type = 'field_back' def __init__(self, parent, name): assert(isinstance(parent, ButtonWidget)) super(FieldBackElement, self).__init__(parent.xmlui, parent) self.elem.setAttribute('name', name) class InternalFieldElement(Element): """ Used by internal callbacks to indicate which fields are manipulated """ type = 'internal_field' def __init__(self, parent, name): super(InternalFieldElement, self).__init__(parent.xmlui, parent) self.elem.setAttribute('name', name) class InternalDataElement(Element): """ Used by internal callbacks to retrieve extra data """ type = 'internal_data' def __init__(self, parent, children): super(InternalDataElement, self).__init__(parent.xmlui, parent) assert(isinstance(children, list)) for child in children: self.elem.childNodes.append(child) class OptionElement(Element): """" Used by ListWidget to specify options """ type = 'option' def __init__(self, parent, option, selected=False): """ @param parent @param option (string, tuple) @param selected (boolean) """ assert(isinstance(parent, ListWidget)) super(OptionElement, self).__init__(parent.xmlui, parent) if isinstance(option, basestring): value, label = option, option elif isinstance(option, tuple): value, label = option self.elem.setAttribute('value', value) self.elem.setAttribute('label', label) if selected: self.elem.setAttribute('selected', 'true') class RowElement(Element): """" Used by AdvancedListContainer """ type = 'row' def __init__(self, parent): assert(isinstance(parent, AdvancedListContainer)) super(RowElement, self).__init__(parent.xmlui, parent) if parent.next_row_idx is not None: if parent.auto_index: raise exceptions.DataError(_("Can't set row index if auto_index is True")) self.elem.setAttribute('index', parent.next_row_idx) parent.next_row_idx = None class HeaderElement(Element): """" Used by AdvancedListContainer """ type = 'header' def __init__(self, parent, name=None, label=None, description=None): """ @param parent: AdvancedListContainer instance @param name: name of the container @param label: label to be displayed in columns @param description: long descriptive text """ assert(isinstance(parent, AdvancedListContainer)) super(HeaderElement, self).__init__(parent.xmlui, parent) if name: self.elem.setAttribute('name', name) if label: self.elem.setAttribute('label', label) if description: self.elem.setAttribute('description', description) class Container(Element): """ And Element which contains other ones and has a layout """ type = None def __init__(self, xmlui, parent=None): """Create a container element @param xmlui: XMLUI instance @parent: parent element or None """ self.elem = xmlui.doc.createElement('container') super(Container, self).__init__(xmlui, parent) self.elem.setAttribute('type', self.type) def getParentContainer(self): """ Return first parent container @return: parent container or None """ current = self.parent while(not isinstance(current, (Container)) and current is not None): current = current.parent return current class VerticalContainer(Container): type = "vertical" class HorizontalContainer(Container): type = "horizontal" class PairsContainer(Container): type = "pairs" class TabsContainer(Container): type = "tabs" def addTab(self, name, label=None, container=VerticalContainer): """Add a tab""" if not label: label = name tab_elt = TabElement(self, name, label) new_container = container(self.xmlui, tab_elt) self.xmlui.changeContainer(new_container) def end(self): """ Called when we have finished tabs change current container to first container parent """ parent_container = self.getParentContainer() self.xmlui.changeContainer(parent_container) class AdvancedListContainer(Container): type = "advanced_list" def __init__(self, xmlui, callback_id=None, name=None, headers=None, items=None, columns=None, selectable = 'no', auto_index = False, parent=None): """Create an advanced list @param headers: optional headers informations @param callback_id: id of the method to call when selection is done @param items: list of widgets to add (just the first row) @param columns: number of columns in this table, or None to autodetect @param selectable: one of: 'no': nothing is done 'single': one row can be selected @param auto_index: if True, indexes will be generated by frontends, starting from 0 @return: created element """ assert selectable in ('no', 'single') if not items and columns is None: raise exceptions.DataError(_("either items or columns need do be filled")) if headers is None: headers = [] if items is None: items = [] super(AdvancedListContainer, self).__init__(xmlui, parent) if columns is None: columns = len(items[0]) self._columns = columns self._item_idx = 0 self.current_row = None if headers: if len(headers) != self._columns: raise exceptions.DataError(_("Headers lenght doesn't correspond to columns")) self.addHeaders(headers) if items: self.addItems(items) self.elem.setAttribute('columns', str(self._columns)) if callback_id is not None: self.elem.setAttribute('callback', callback_id) self.elem.setAttribute('selectable', selectable) self.auto_index = auto_index if auto_index: self.elem.setAttribute('auto_index', 'true') self.next_row_idx = None def addHeaders(self, headers): for header in headers: self.addHeader(header) def addHeader(self, header): pass # TODO def addItems(self, items): for item in items: self.append(item) def setRowIndex(self, idx): """ Set index for next row index are returned when a row is selected, in data's "index" key @param idx: string index to associate to the next row """ self.next_row_idx = idx def append(self, child): if isinstance(child, RowElement): return super(AdvancedListContainer, self).append(child) if self._item_idx % self._columns == 0: self.current_row = RowElement(self) self.current_row.append(child) self._item_idx += 1 def end(self): """ Called when we have finished list change current container to first container parent """ if self._item_idx % self._columns != 0: raise exceptions.DataError(_("Incorrect number of items in list")) parent_container = self.getParentContainer() self.xmlui.changeContainer(parent_container) class Widget(Element): type = None def __init__(self, xmlui, name=None, parent=None): """Create an element @param xmlui: XMLUI instance @param name: name of the element or None @param parent: parent element or None """ self.elem = xmlui.doc.createElement('widget') super(Widget, self).__init__(xmlui, parent) if name: self.elem.setAttribute('name', name) self.elem.setAttribute('type', self.type) def setInternalCallback(self, callback, fields, data_elts=None): """Set an internal UI callback when the widget value is changed. The internal callbacks are NO callback ids, they are strings from a predefined set of actions that are running in the scope of XMLUI. @param callback (string): a value from: - 'copy': process the widgets given in 'fields' two by two, by copying the values of one widget to the other. Target widgets of type List do not accept the empty value. - 'move': same than copy but moves the values if the source widget is not a List. - 'groups_of_contact': process the widgets two by two, assume A is is a list of JID and B a list of groups, select in B the groups to which the JID selected in A belongs. - more operation to be added when necessary... @param fields (list): a list of widget names (string) @param data_elts (list[Element]): extra data elements """ self.elem.setAttribute('internal_callback', callback) if fields: for field in fields: InternalFieldElement(self, field) if data_elts: InternalDataElement(self, data_elts) class InputWidget(Widget): pass class EmptyWidget(Widget): type = 'empty' class TextWidget(Widget): type = 'text' def __init__(self, xmlui, value, name=None, parent=None): super(TextWidget, self).__init__(xmlui, name, parent) text = self.xmlui.doc.createTextNode(value) self.elem.appendChild(text) class LabelWidget(Widget): type='label' def __init__(self, xmlui, label, name=None, parent=None): super(LabelWidget, self).__init__(xmlui, name, parent) self.elem.setAttribute('value', label) class JidWidget(Widget): type='jid' def __init__(self, xmlui, jid, name=None, parent=None): super(JidWidget, self).__init__(xmlui, name, parent) try: self.elem.setAttribute('value', jid.full()) except AttributeError: self.elem.setAttribute('value', unicode(jid)) class DividerWidget(Widget): type = 'divider' def __init__(self, xmlui, style='line', name=None, parent=None): """ Create a divider @param xmlui: XMLUI instance @param style: one of: - line: a simple line - dot: a line of dots - dash: a line of dashes - plain: a full thick line - blank: a blank line/space @param name: name of the widget @param parent: parent container """ super(DividerWidget, self).__init__(xmlui, name, parent) self.elem.setAttribute('style', style) class StringWidget(InputWidget): type = 'string' def __init__(self, xmlui, value=None, name=None, parent=None): super(StringWidget, self).__init__(xmlui, name, parent) if value: self.elem.setAttribute('value', value) class PasswordWidget(StringWidget): type = 'password' class TextBoxWidget(StringWidget): type = 'textbox' class BoolWidget(InputWidget): type = 'bool' def __init__(self, xmlui, value='false', name=None, parent=None): if isinstance(value, bool): value = 'true' if value else 'false' elif value == '0': value='false' elif value == '1': value='true' if not value in ('true', 'false'): raise exceptions.DataError(_("Value must be 0, 1, false or true")) super(BoolWidget, self).__init__(xmlui, name, parent) self.elem.setAttribute('value', value) class ButtonWidget(Widget): type = 'button' def __init__(self, xmlui, callback_id, value=None, fields_back=None, name=None, parent=None): """Add a button @param callback_id: callback which will be called if button is pressed @param value: label of the button @fields_back: list of names of field to give back when pushing the button @param name: name @param parent: parent container """ if fields_back is None: fields_back = [] super(ButtonWidget, self).__init__(xmlui, name, parent) self.elem.setAttribute('callback', callback_id) if value: self.elem.setAttribute('value', value) for field in fields_back: FieldBackElement(self, field) class ListWidget(InputWidget): type = 'list' def __init__(self, xmlui, options, selected=None, style=None, name=None, parent=None): """ @param xmlui @param options (list[string, tuple]): each option can be given as: - a string if the label and the value are the same - a couple if the label and the value differ @param selected (list[string]): list of the selected values @param style (string) @param name (string) @param parent """ if style is None: style = set() styles = set(style) if not options: log.warning(_('empty "options" list')) if not styles.issubset(['multi']): raise exceptions.DataError(_("invalid styles")) super(ListWidget, self).__init__(xmlui, name, parent) self.addOptions(options, selected) for style in styles: self.elem.setAttribute(style, 'yes') def addOptions(self, options, selected=None): """Add options to a multi-values element (e.g. list) """ if selected: if isinstance(selected, basestring): selected = [selected] else: selected = [] for option in options: OptionElement(self, option, option in selected) ## XMLUI main class class XMLUI(object): """This class is used to create a user interface (form/window/parameters/etc) using SàT XML""" def __init__(self, panel_type="window", container="vertical", title=None, submit_id=None, session_id=None): """Init SàT XML Panel @param panel_type: one of - window (new window) - popup - form (formulaire, depend of the frontend, usually a panel with cancel/submit buttons) - param (parameters, presentation depend of the frontend) @param container: disposition of elements, one of: - vertical: elements are disposed up to bottom - horizontal: elements are disposed left to right - pairs: elements come on two aligned columns (usually one for a label, the next for the element) - tabs: elemens are in categories with tabs (notebook) @param title: title or default if None @param submit_id: callback id to call for panel_type we can submit (form, param) """ self._introspect() if panel_type not in ['window', 'form', 'param', 'popup']: raise exceptions.DataError(_("Unknown panel type [%s]") % panel_type) if panel_type == 'form' and submit_id is None: raise exceptions.DataError(_("form XMLUI need a submit_id")) if not isinstance(container, basestring): raise exceptions.DataError(_("container argument must be a string")) self.type = panel_type impl = minidom.getDOMImplementation() self.doc = impl.createDocument(None, "sat_xmlui", None) top_element = self.doc.documentElement top_element.setAttribute("type", panel_type) if title: top_element.setAttribute("title", title) self.submit_id = submit_id self.session_id = session_id self.main_container = self._createContainer(container, TopElement(self)) self.current_container = self.main_container def _introspect(self): """ Introspect module to find Widgets and Containers """ self._containers = {} self._widgets = {} for obj in globals().values(): try: if issubclass(obj, Widget): if obj.__name__ == 'Widget': continue self._widgets[obj.type] = obj elif issubclass(obj, Container): if obj.__name__ == 'Container': continue self._containers[obj.type] = obj except TypeError: pass def __del__(self): self.doc.unlink() def __getattr__(self, name): if name.startswith("add") and name not in ('addWidget',): # addWidgetName(...) create an instance of WidgetName class_name = name[3:]+"Widget" if class_name in globals(): cls = globals()[class_name] if issubclass(cls, Widget): def createWidget(*args, **kwargs): if "parent" not in kwargs: kwargs["parent"] = self.current_container if "name" not in kwargs and issubclass(cls, InputWidget): # name can be given as first argument or in keyword arguments for InputWidgets args = list(args) kwargs["name"] = args.pop(0) return cls(self, *args, **kwargs) return createWidget return object.__getattribute__(self, name) @property def submit_id(self): top_element = self.doc.documentElement value = top_element.getAttribute("submit") return value or None @submit_id.setter def submit_id(self, value): top_element = self.doc.documentElement if value is None: try: top_element.removeAttribute("submit") except NotFoundErr: pass elif value: # submit_id can be the empty string to bypass form restriction top_element.setAttribute("submit", value) @property def session_id(self): top_element = self.doc.documentElement value = top_element.getAttribute("session_id") return value or None @session_id.setter def session_id(self, value): top_element = self.doc.documentElement if value is None: try: top_element.removeAttribute("session_id") except NotFoundErr: pass elif value: top_element.setAttribute("session_id", value) else: raise exceptions.DataError("session_id can't be empty") def _createContainer(self, container, parent=None, **kwargs): """Create a container element @param type: container type (cf init doc) @parent: parent element or None """ if container not in self._containers: raise exceptions.DataError(_("Unknown container type [%s]") % container) cls = self._containers[container] new_container = cls(self, parent=parent, **kwargs) return new_container def changeContainer(self, container, **kwargs): """Change the current container @param container: either container type (container it then created), or an Container instance""" if isinstance(container, basestring): self.current_container = self._createContainer(container, self.current_container.getParentContainer() or self.main_container, **kwargs) else: self.current_container = self.main_container if container is None else container assert(isinstance(self.current_container, Container)) return self.current_container def addWidget(self, type_, *args, **kwargs): """Convenience method to add an element""" if type_ not in self._widgets: raise exceptions.DataError(_("Invalid type [%s]") % type_) if "parent" not in kwargs: kwargs["parent"] = self.current_container cls = self._widgets[type_] return cls(self, *args, **kwargs) def toXml(self): """return the XML representation of the panel""" return self.doc.toxml() # Misc other funtions class ElementParser(object): """callable class to parse XML string into Element Found at http://stackoverflow.com/questions/2093400/how-to-create-twisted-words-xish-domish-element-entirely-from-raw-xml/2095942#2095942 (c) Karl Anderson""" def __call__(self, string, force_spaces=False): """ @param string: the XML string @param force_spaces: if True, replace occurrences of 'n' and '\t' with ' '. """ self.result = None def onStart(elem): self.result = elem def onEnd(): pass def onElement(elem): self.result.addChild(elem) parser = domish.elementStream() parser.DocumentStartEvent = onStart parser.ElementEvent = onElement parser.DocumentEndEvent = onEnd tmp = domish.Element((None, "s")) if force_spaces: string = string.replace('\n', ' ').replace('\t', ' ') tmp.addRawXml(string) parser.parse(tmp.toXml().encode('utf-8')) return self.result.firstChildElement()