334 lines
10 KiB
Python
334 lines
10 KiB
Python
# This file is part of facho. The COPYRIGHT file at the top level of
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# this repository contains the full copyright notices and license terms.
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from lxml import etree
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from lxml.etree import Element, SubElement, tostring
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import re
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from collections import defaultdict
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from copy import deepcopy
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from pprint import pprint
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class FachoValueInvalid(Exception):
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def __init__(self, xpath):
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super().__init__('FachoValueInvalid invalid xpath %s' % (xpath))
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class FachoXMLExtension:
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def build(self, fachoxml):
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raise NotImplementedError
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class LXMLBuilder:
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"""
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extrae la manipulacion de XML
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"""
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# TODO buscar el termino mas adecuado
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# ya que son varios lo procesos que se
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# exponen en la misma clase
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# * creacion
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# * busquedad
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# * comparacion
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def __init__(self, nsmap):
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self.nsmap = nsmap
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self._re_node_expr = re.compile(r'^(?P<path>((?P<ns>\w+):)?(?P<tag>[a-zA-Z0-9_-]+))(?P<attrs>\[.+\])?')
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self._re_attrs = re.compile(r'(\w+)\s*=\s*\"?(\w+)\"?')
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def match_expression(self, node_expr):
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match = re.search(self._re_node_expr, node_expr)
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return match.groupdict()
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@classmethod
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def from_string(cls, content, clean_namespaces=False):
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if clean_namespaces:
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content = re.sub(r'\<\s*[a-zA-Z\-0-9]+\s*:', '<', content)
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content = re.sub(r'\<\/\s*[a-zA-Z\-0-9]+\s*:', '</', content)
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return etree.fromstring(content)
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@classmethod
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def build_element_from_string(cls, string, nsmap):
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return Element(string, nsmap=nsmap)
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def build_element(self, tag, ns=None, attribs={}):
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attribs['nsmap'] = ns
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if ns:
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tag = '{%s}%s' % (self.nsmap[ns], tag)
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return Element(tag, **attribs)
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def build_from_expression(self, node_expr):
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match = re.search(self._re_node_expr, node_expr)
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expr = match.groupdict()
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attrs = dict(re.findall(self._re_attrs, expr['attrs'] or ''))
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attrs['nsmap'] = None
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if expr['ns'] and expr['tag']:
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ns = expr['ns']
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tag = expr['tag']
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if self.nsmap:
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node = Element('{%s}%s' % (self.nsmap[ns], tag), **attrs)
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else:
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node = Element(tag, **attrs)
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return node
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return Element(expr['tag'], **attrs)
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def _normalize_tag(self, tag):
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return re.sub(r'^(\{.+\}|.+:)', '', tag)
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def get_tag(self, elem):
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return self._normalize_tag(elem.tag)
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def same_tag(self, a, b):
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return self._normalize_tag(a) \
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== self._normalize_tag(b)
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def find_relative(self, elem, xpath, ns):
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return elem.find(xpath, ns)
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def append(self, elem, child):
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elem.append(child)
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def append_next(self, elem, slibing):
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elem.addnext(slibing)
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def remove(self, elem):
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elem.getparent().remove(elem)
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def set_text(self, elem, text):
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elem.text = text
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def xpath(self, elem, xpath):
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elems = elem.xpath(xpath, namespaces=self.nsmap)
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if elems:
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return elems[0]
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return None
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def get_text(self, elem):
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return elem.text
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def get_attribute(self, elem, key):
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return elem.attrib[key]
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def set_attribute(self, elem, key, value):
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elem.attrib[key] = value
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@classmethod
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def tostring(self, oelem, **attrs):
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elem = deepcopy(oelem)
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attrs['pretty_print'] = attrs.pop('pretty_print', False)
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attrs['encoding'] = attrs.pop('encoding', 'UTF-8')
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for el in elem.getiterator():
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is_optional = el.get('facho_optional', 'False') == 'True'
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if is_optional and el.getchildren() == []:
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print(tostring(el))
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el.getparent().remove(el)
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return tostring(elem, **attrs).decode('utf-8')
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class FachoXML:
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"""
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Decora XML con funciones de consulta XPATH de un solo elemento
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"""
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def __init__(self, root, builder=None, nsmap=None, fragment_prefix=''):
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if builder is None:
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self.builder = LXMLBuilder(nsmap)
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else:
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self.builder = builder
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self.nsmap = nsmap
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if isinstance(root, str):
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self.root = self.builder.build_element_from_string(root, nsmap)
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else:
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self.root = root
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self.fragment_prefix = fragment_prefix
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self.xpath_for = {}
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self.extensions = []
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self._validators = defaultdict(lambda: lambda v, attrs: True)
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@classmethod
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def from_string(cls, document: str, namespaces: dict() = []) -> 'FachoXML':
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xml = LXMLBuilder.from_string(document)
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return FachoXML(xml, nsmap=namespaces)
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def append_element(self, elem, new_elem):
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#elem = self.find_or_create_element(xpath, append=append)
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#self.builder.append(elem, new_elem)
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self.builder.append(elem, new_elem)
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def add_extension(self, extension):
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extension.build(self)
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def fragment(self, xpath, append=False, append_not_exists=False):
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nodes = xpath.split('/')
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nodes.pop()
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root_prefix = '/'.join(nodes)
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parent = None
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if append_not_exists:
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parent = self.get_element(xpath)
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if parent is None:
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parent = self.find_or_create_element(xpath, append=append)
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return FachoXML(parent, nsmap=self.nsmap, fragment_prefix=root_prefix)
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def register_alias_xpath(self, alias, xpath):
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self.xpath_for[alias] = xpath
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def _translate_xpath_for(self, xpath):
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if xpath in self.xpath_for:
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xpath = self.xpath_for[xpath]
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return xpath
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def _normalize_xpath(self, xpath):
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return xpath.replace('//', '/')
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def _path_xpath_for(self, xpath):
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return self._normalize_xpath(self._translate_xpath_for(xpath))
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def placeholder_for(self, xpath, append=False, optional=False):
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elem = self.find_or_create_element(xpath, append)
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if optional:
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elem.set('facho_optional', 'True')
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return elem
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def replacement_for(self, xpath, new_xpath, content, **attrs):
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elem = self.get_element(xpath)
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self.builder.remove(elem)
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return self.set_element(new_xpath, content, **attrs)
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def find_or_create_element(self, xpath, append=False):
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"""
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@param xpath ruta xpath para crear o consultar de un solo elemendo
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@param append True si se debe adicionar en la ruta xpath indicada
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@return elemento segun self.builder
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"""
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xpath = self._path_xpath_for(xpath)
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node_paths = xpath.split('/')
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node_paths.pop(0) #remove empty /
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root_tag = node_paths.pop(0)
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root_node = self.builder.build_from_expression(root_tag)
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if xpath.startswith('.'):
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# restaurar ya que no es la raiz y asignar actual como raiz
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node_paths.insert(0, root_tag)
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root_node = self.root
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if not self.builder.same_tag(root_node.tag, self.root.tag):
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raise ValueError('xpath %s must be absolute to /%s' % (xpath, self.root.tag))
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# crea jerarquia segun xpath indicado
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parent = None
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current_elem = self.root
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for node_path in node_paths:
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node_expr = self.builder.match_expression(node_path)
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node = self.builder.build_from_expression(node_path)
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child = self.builder.find_relative(current_elem, node_expr['path'], self.nsmap)
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parent = current_elem
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if child is not None:
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current_elem = child
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else:
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self.builder.append(current_elem, node)
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current_elem = node
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# se fuerza la adicion como un nuevo elemento
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if append:
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node_tag = node_paths[-1]
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last_slibing = current_elem
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for child in parent.getchildren():
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if child.tag == node_tag:
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last_slibing = child
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node = self.builder.build_from_expression(node_tag)
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self.builder.append_next(last_slibing, node)
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return node
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try:
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# TODO(bit4bit) acoplamiento indirecto a placeholder
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del current_elem.attrib['facho_optional']
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except KeyError:
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pass
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return current_elem
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def set_element_validator(self, xpath, validator = False):
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"""
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validador al asignar contenido a xpath indicado
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@param xpath ruta tipo XPath
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@param validator callback(content, attributes)
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"""
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key = self._path_xpath_for(xpath)
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if not validator:
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self._validators[key] = lambda v, attrs: True
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else:
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self._validators[key] = validator
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def set_element(self, xpath, content, **attrs):
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"""
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asigna contenido ubicado por ruta tipo XPATH.
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@param xpath ruta tipo XPATH
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@param content contenido
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@return lxml.Element
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"""
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xpath = self._path_xpath_for(xpath)
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format_ = attrs.pop('format_', '%s')
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append_ = attrs.pop('append_', False)
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elem = self.find_or_create_element(xpath, append=append_)
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validator = self._validators[xpath]
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if not validator(content, attrs):
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raise FachoValueInvalid(xpath)
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if content:
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self.builder.set_text(elem, format_ % content)
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for k, v in attrs.items():
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self.builder.set_attribute(elem, k, v)
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return elem
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def set_attributes(self, xpath, **attrs):
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"""
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asigna atributos a elemento xml ubicador por ruta XPATH
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@param xpath ruta tipo XPATH
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@param keywords clave valor de los atributos
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"""
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xpath = self._path_xpath_for(xpath)
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elem = self.get_element(xpath)
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for k, v in attrs.items():
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self.builder.set_attribute(elem, k, v)
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return self
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def get_element_attribute(self, xpath, attribute):
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elem = self.get_element(xpath)
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return self.builder.get_attribute(elem, attribute)
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def get_element(self, xpath):
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xpath = self.fragment_prefix + self._path_xpath_for(xpath)
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return self.builder.xpath(self.root, xpath)
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def get_element_text(self, xpath, format_=str):
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xpath = self.fragment_prefix + self._path_xpath_for(xpath)
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elem = self.builder.xpath(self.root, xpath)
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text = self.builder.get_text(elem)
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return format_(text)
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def tostring(self, **kw):
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return self.builder.tostring(self.root, **kw)
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def __str__(self):
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return self.tostring()
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