forked from s444417/ProjektAI
214 lines
6.2 KiB
Python
214 lines
6.2 KiB
Python
from __future__ import absolute_import, division, unicode_literals
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from pip._vendor.six import text_type
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from lxml import etree
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from ..treebuilders.etree import tag_regexp
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from . import base
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from .. import _ihatexml
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def ensure_str(s):
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if s is None:
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return None
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elif isinstance(s, text_type):
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return s
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else:
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return s.decode("ascii", "strict")
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class Root(object):
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def __init__(self, et):
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self.elementtree = et
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self.children = []
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try:
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if et.docinfo.internalDTD:
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self.children.append(Doctype(self,
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ensure_str(et.docinfo.root_name),
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ensure_str(et.docinfo.public_id),
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ensure_str(et.docinfo.system_url)))
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except AttributeError:
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pass
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try:
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node = et.getroot()
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except AttributeError:
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node = et
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while node.getprevious() is not None:
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node = node.getprevious()
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while node is not None:
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self.children.append(node)
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node = node.getnext()
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self.text = None
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self.tail = None
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def __getitem__(self, key):
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return self.children[key]
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def getnext(self):
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return None
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def __len__(self):
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return 1
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class Doctype(object):
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def __init__(self, root_node, name, public_id, system_id):
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self.root_node = root_node
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self.name = name
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self.public_id = public_id
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self.system_id = system_id
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self.text = None
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self.tail = None
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def getnext(self):
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return self.root_node.children[1]
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class FragmentRoot(Root):
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def __init__(self, children):
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self.children = [FragmentWrapper(self, child) for child in children]
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self.text = self.tail = None
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def getnext(self):
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return None
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class FragmentWrapper(object):
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def __init__(self, fragment_root, obj):
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self.root_node = fragment_root
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self.obj = obj
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if hasattr(self.obj, 'text'):
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self.text = ensure_str(self.obj.text)
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else:
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self.text = None
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if hasattr(self.obj, 'tail'):
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self.tail = ensure_str(self.obj.tail)
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else:
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self.tail = None
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def __getattr__(self, name):
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return getattr(self.obj, name)
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def getnext(self):
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siblings = self.root_node.children
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idx = siblings.index(self)
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if idx < len(siblings) - 1:
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return siblings[idx + 1]
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else:
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return None
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def __getitem__(self, key):
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return self.obj[key]
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def __bool__(self):
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return bool(self.obj)
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def getparent(self):
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return None
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def __str__(self):
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return str(self.obj)
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def __unicode__(self):
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return str(self.obj)
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def __len__(self):
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return len(self.obj)
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class TreeWalker(base.NonRecursiveTreeWalker):
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def __init__(self, tree):
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# pylint:disable=redefined-variable-type
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if isinstance(tree, list):
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self.fragmentChildren = set(tree)
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tree = FragmentRoot(tree)
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else:
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self.fragmentChildren = set()
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tree = Root(tree)
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base.NonRecursiveTreeWalker.__init__(self, tree)
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self.filter = _ihatexml.InfosetFilter()
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def getNodeDetails(self, node):
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if isinstance(node, tuple): # Text node
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node, key = node
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assert key in ("text", "tail"), "Text nodes are text or tail, found %s" % key
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return base.TEXT, ensure_str(getattr(node, key))
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elif isinstance(node, Root):
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return (base.DOCUMENT,)
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elif isinstance(node, Doctype):
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return base.DOCTYPE, node.name, node.public_id, node.system_id
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elif isinstance(node, FragmentWrapper) and not hasattr(node, "tag"):
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return base.TEXT, ensure_str(node.obj)
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elif node.tag == etree.Comment:
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return base.COMMENT, ensure_str(node.text)
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elif node.tag == etree.Entity:
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return base.ENTITY, ensure_str(node.text)[1:-1] # strip &;
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else:
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# This is assumed to be an ordinary element
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match = tag_regexp.match(ensure_str(node.tag))
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if match:
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namespace, tag = match.groups()
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else:
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namespace = None
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tag = ensure_str(node.tag)
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attrs = {}
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for name, value in list(node.attrib.items()):
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name = ensure_str(name)
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value = ensure_str(value)
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match = tag_regexp.match(name)
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if match:
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attrs[(match.group(1), match.group(2))] = value
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else:
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attrs[(None, name)] = value
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return (base.ELEMENT, namespace, self.filter.fromXmlName(tag),
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attrs, len(node) > 0 or node.text)
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def getFirstChild(self, node):
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assert not isinstance(node, tuple), "Text nodes have no children"
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assert len(node) or node.text, "Node has no children"
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if node.text:
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return (node, "text")
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else:
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return node[0]
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def getNextSibling(self, node):
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if isinstance(node, tuple): # Text node
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node, key = node
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assert key in ("text", "tail"), "Text nodes are text or tail, found %s" % key
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if key == "text":
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# XXX: we cannot use a "bool(node) and node[0] or None" construct here
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# because node[0] might evaluate to False if it has no child element
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if len(node):
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return node[0]
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else:
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return None
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else: # tail
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return node.getnext()
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return (node, "tail") if node.tail else node.getnext()
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def getParentNode(self, node):
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if isinstance(node, tuple): # Text node
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node, key = node
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assert key in ("text", "tail"), "Text nodes are text or tail, found %s" % key
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if key == "text":
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return node
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# else: fallback to "normal" processing
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elif node in self.fragmentChildren:
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return None
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return node.getparent()
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