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#!/usr/bin/env python # coding: utf-8 """ Converts a Python dictionary or other native data type into a valid XML string. Supports item (`int`, `float`, `long`, `decimal.Decimal`, `bool`, `str`, `unicode`, `datetime`, `none` and other number-like objects) and collection (`list`, `set`, `tuple` and `dict`, as well as iterable and dict-like objects) data types, with arbitrary nesting for the collections. Items with a `datetime` type are converted to ISO format strings. Items with a `None` type become empty XML elements. This module works with both Python 2 and 3. """ from __future__ import unicode_literals __version__ = '1.7.16' version = __version__ from random import randint try: from collections.abc import Iterable as iterable except ImportError: from collections import Iterable as iterable import numbers import logging from xml.dom.minidom import parseString LOG = logging.getLogger("dicttoxml") # python 3 doesn't have a unicode type try: unicode except: unicode = str # python 3 doesn't have a long type try: long except: long = int def set_debug(debug=False, filename='dicttoxml.log'): if debug: import datetime print('Debug mode is on. Events are logged at: %s' % (filename)) logging.basicConfig(filename=filename, level=logging.INFO) LOG.info('\nLogging session starts: %s' % ( str(datetime.datetime.today())) ) else: logging.basicConfig(level=logging.WARNING) def unicode_me(val): """Converts strings with non-ASCII characters to unicode for LOG. Python 3 doesn't have a `unicode()` function, so `unicode()` is an alias for `str()`, but `str()` doesn't take a second argument, hence this kludge. """ LOG.info('Inside unicode_me(). val = "%s"' % (val, )) try: return unicode(val, 'utf-8') except: return unicode(val) ids = [] # initialize list of unique ids def make_id(element, start=100000, end=999999): """Returns a random integer""" LOG.info('Inside make_id(). element = "%s", start="%s", end="%s"' % (element, start, end)) return '%s_%s' % (element, randint(start, end)) def get_unique_id(element): """Returns a unique id for a given element""" LOG.info('Inside get_unique_id(). element = "%s"' % (element, )) this_id = make_id(element) dup = True while dup: if this_id not in ids: dup = False ids.append(this_id) else: this_id = make_id(element) return ids[-1] def get_xml_type(val): """Returns the data type for the xml type attribute""" LOG.info('Inside get_xml_type(). val = "%s", type(val) = "%s"' % (val, type(val).__name__)) if type(val).__name__ == 'NoneType': LOG.info("type(val).__name__ == 'NoneType', returning 'null'") return 'null' elif type(val).__name__ == 'bool': LOG.info("type(val).__name__ == 'bool', returning 'bool'") return 'bool' elif type(val).__name__ in ('str', 'unicode'): LOG.info("type(val).__name__ in ('str', unicode'), returning 'str'") return 'str' elif type(val).__name__ in ('int', 'long'): LOG.info("type(val).__name__ in ('int', long'), returning 'int'") return 'int' elif type(val).__name__ == 'float': LOG.info("type(val).__name__ == 'float', returning 'float'") return 'float' elif isinstance(val, numbers.Number): LOG.info("isinstance(val, numbers.Number), returning 'number'") return 'number' elif isinstance(val, dict): LOG.info("isinstance(val, dict), returning 'dict'") return 'dict' elif isinstance(val, iterable): LOG.info("isinstance(val, iterable), returning 'list'") return 'list' LOG.info("type not found, returning '%s'" % (type(val).__name__)) return type(val).__name__ def escape_xml(s): LOG.info('Inside escape_xml(). s = "%s" and type(s) = "%s"' % (s, type(s))) if type(s) in (str, unicode): s = unicode_me(s) # avoid UnicodeDecodeError s = s.replace('&', '&') s = s.replace('"', '"') s = s.replace('\'', ''') s = s.replace('<', '<') s = s.replace('>', '>') return s def make_attrstring(attr): """Returns an attribute string in the form key="val" """ LOG.info('Inside make_attstring(). attr = "%s"' % (attr, )) attrstring = ' '.join(['%s="%s"' % (k, v) for k, v in attr.items()]) return '%s%s' % (' ' if attrstring != '' else '', attrstring) def key_is_valid_xml(key): """Checks that a key is a valid XML name""" LOG.info('Inside key_is_valid_xml(). Testing "%s"' % (unicode_me(key))) test_xml = '<?xml version="1.0" encoding="UTF-8" ?><%s>foo</%s>' % (key, key) try: parseString(test_xml) return True except Exception: # minidom does not implement exceptions well return False def make_valid_xml_name(key, attr): """Tests an XML name and fixes it if invalid""" LOG.info('Inside make_valid_xml_name(). Testing key "%s" with attr "%s"' % ( unicode_me(key), unicode_me(attr)) ) key = escape_xml(key) attr = escape_xml(attr) # pass through if key is already valid if key_is_valid_xml(key): return key, attr # prepend a lowercase n if the key is numeric # handle integers first if str(key).isdigit(): return 'n%s' % (key), attr # now handle floats try: return 'n%s' % (float(str(key))), attr except ValueError: pass # replace spaces with underscores if that fixes the problem if key_is_valid_xml(key.replace(' ', '_')): return key.replace(' ', '_'), attr # key is still invalid - move it into a name attribute attr['name'] = key key = 'key' return key, attr def wrap_cdata(val): """Wraps a string into CDATA sections""" LOG.info('Inside wrap_cdata(). val = "%s"' % (val, )) val = unicode_me(val).replace(']]>', ']]]]><![CDATA[>') return '<![CDATA[' + val + ']]>' def default_item_func(parent): LOG.info('Inside default_item_func(). parent = "%s"' % (parent, )) return 'item' def convert(obj, ids, attr_type, item_func, cdata, parent='root'): """Routes the elements of an object to the right function to convert them based on their data type""" LOG.info('Inside convert(). obj type is: "%s", obj="%s"' % (type(obj).__name__, unicode_me(obj))) item_name = item_func(parent) if type(obj) == bool: return convert_bool(item_name, obj, attr_type, cdata) if obj is None: return convert_none(item_name, obj, attr_type, cdata) if isinstance(obj, numbers.Number) or type(obj) in (str, unicode): return convert_kv(item_name, obj, attr_type, cdata) if hasattr(obj, 'isoformat'): return convert_kv(item_name, obj.isoformat(), attr_type, cdata) if isinstance(obj, dict): return convert_dict(obj, ids, parent, attr_type, item_func, cdata) if isinstance(obj, iterable): return convert_list(obj, ids, parent, attr_type, item_func, cdata) raise TypeError('Unsupported data type: %s (%s)' % (obj, type(obj).__name__)) def convert_dict(obj, ids, parent, attr_type, item_func, cdata): """Converts a dict into an XML string.""" LOG.info('Inside convert_dict(): obj type is: "%s", obj="%s"' % ( type(obj).__name__, unicode_me(obj)) ) output = [] addline = output.append item_name = item_func(parent) for key, val in obj.items(): LOG.info('Looping inside convert_dict(): key="%s", val="%s", type(val)="%s"' % ( unicode_me(key), unicode_me(val), type(val).__name__) ) attr = {} if not ids else {'id': '%s' % (get_unique_id(parent)) } key, attr = make_valid_xml_name(key, attr) if type(val) == bool: addline(convert_bool(key, val, attr_type, cdata, attr)) elif isinstance(val, numbers.Number) or type(val) in (str, unicode): addline(convert_kv(key, val, attr_type, cdata, attr)) elif hasattr(val, 'isoformat'): # datetime addline(convert_kv(key, val.isoformat(), attr_type, cdata, attr)) elif type(val) == bool: addline(convert_bool(key, val, attr_type, cdata, attr)) elif isinstance(val, dict): if attr_type: attr['type'] = get_xml_type(val) addline('<%s%s>%s</%s>' % ( key, make_attrstring(attr), convert_dict(val, ids, key, attr_type, item_func, cdata), key ) ) elif isinstance(val, iterable): if attr_type: attr['type'] = get_xml_type(val) addline('<%s%s>%s</%s>' % ( key, make_attrstring(attr), convert_list(val, ids, key, attr_type, item_func, cdata), key ) ) elif val is None: addline(convert_none(key, val, attr_type, cdata, attr)) else: raise TypeError('Unsupported data type: %s (%s)' % ( val, type(val).__name__) ) return ''.join(output) def convert_list(items, ids, parent, attr_type, item_func, cdata): """Converts a list into an XML string.""" LOG.info('Inside convert_list()') output = [] addline = output.append item_name = item_func(parent) if ids: this_id = get_unique_id(parent) for i, item in enumerate(items): LOG.info('Looping inside convert_list(): item="%s", item_name="%s", type="%s"' % ( unicode_me(item), item_name, type(item).__name__) ) attr = {} if not ids else { 'id': '%s_%s' % (this_id, i+1) } if isinstance(item, numbers.Number) or type(item) in (str, unicode): addline(convert_kv(item_name, item, attr_type, cdata, attr)) elif hasattr(item, 'isoformat'): # datetime addline(convert_kv(item_name, item.isoformat(), attr_type, cdata, attr)) elif type(item) == bool: addline(convert_bool(item_name, item, attr_type, cdata, attr)) elif isinstance(item, dict): if not attr_type: addline('<%s>%s</%s>' % ( item_name, convert_dict(item, ids, parent, attr_type, item_func, cdata), item_name, ) ) else: addline('<%s type="dict">%s</%s>' % ( item_name, convert_dict(item, ids, parent, attr_type, item_func, cdata), item_name, ) ) elif isinstance(item, iterable): if not attr_type: addline('<%s %s>%s</%s>' % ( item_name, make_attrstring(attr), convert_list(item, ids, item_name, attr_type, item_func, cdata), item_name, ) ) else: addline('<%s type="list"%s>%s</%s>' % ( item_name, make_attrstring(attr), convert_list(item, ids, item_name, attr_type, item_func, cdata), item_name, ) ) elif item is None: addline(convert_none(item_name, None, attr_type, cdata, attr)) else: raise TypeError('Unsupported data type: %s (%s)' % ( item, type(item).__name__) ) return ''.join(output) def convert_kv(key, val, attr_type, cdata=False, attr=None): """Converts a number or string into an XML element""" LOG.info('Inside convert_kv(): key="%s", val="%s", type(val) is: "%s"' % ( unicode_me(key), unicode_me(val), type(val).__name__) ) if attr is None: attr = {} key, attr = make_valid_xml_name(key, attr) if attr_type: attr['type'] = get_xml_type(val) attrstring = make_attrstring(attr) return '<%s%s>%s</%s>' % ( key, attrstring, wrap_cdata(val) if cdata == True else escape_xml(val), key ) def convert_bool(key, val, attr_type, cdata=False, attr=None): """Converts a boolean into an XML element""" LOG.info('Inside convert_bool(): key="%s", val="%s", type(val) is: "%s"' % ( unicode_me(key), unicode_me(val), type(val).__name__ ) ) if attr is None: attr = {} key, attr = make_valid_xml_name(key, attr) if attr_type: attr['type'] = get_xml_type(val) attrstring = make_attrstring(attr) return '<%s%s>%s</%s>' % (key, attrstring, unicode(val).lower(), key) def convert_none(key, val, attr_type, cdata=False, attr=None): """Converts a null value into an XML element""" LOG.info('Inside convert_none(): key="%s". val="%s", attr_type="%s", attr=%s' % ( unicode_me(key), unicode_me(val), unicode_me(attr_type), str(attr), ) ) if attr is None: attr = {} key, attr = make_valid_xml_name(key, attr) if attr_type: attr['type'] = get_xml_type(val) attrstring = make_attrstring(attr) return '<%s%s></%s>' % (key, attrstring, key) def dicttoxml( obj, root = True, custom_root = 'root', xml_declaration = True, ids = False, attr_type = True, item_func = default_item_func, cdata = False, include_encoding = True, encoding = 'UTF-8', return_bytes = True, ): """Converts a python object into XML. Arguments: - root specifies whether the output is wrapped in an XML root element Default is True - custom_root allows you to specify a custom root element. Default is 'root' - ids specifies whether elements get unique ids. Default is False - attr_type specifies whether elements get a data type attribute. Default is True - item_func specifies what function should generate the element name for items in a list. Default is 'item' - cdata specifies whether string values should be wrapped in CDATA sections. Default is False """ LOG.info('Inside dicttoxml(): type(obj) is: "%s", obj="%s"' % (type(obj).__name__, unicode_me(obj))) output = [] addline = output.append if root == True: if xml_declaration == True: if include_encoding == False: addline('<?xml version="1.0" ?>') else: addline('<?xml version="1.0" encoding="%s" ?>' % (encoding)) addline('<%s>%s</%s>' % ( custom_root, convert(obj, ids, attr_type, item_func, cdata, parent=custom_root), custom_root, ) ) else: addline(convert(obj, ids, attr_type, item_func, cdata, parent='')) if return_bytes == False: return ''.join(output) return ''.join(output).encode('utf-8')
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