晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //proc/thread-self/root/usr/lib/python3.6/site-packages/pip/_vendor/html5lib/treewalkers/etree.py
from __future__ import absolute_import, division, unicode_literals

try:
    from collections import OrderedDict
except ImportError:
    try:
        from ordereddict import OrderedDict
    except ImportError:
        OrderedDict = dict

import re

from pip._vendor.six import string_types

from . import base
from .._utils import moduleFactoryFactory

tag_regexp = re.compile("{([^}]*)}(.*)")


def getETreeBuilder(ElementTreeImplementation):
    ElementTree = ElementTreeImplementation
    ElementTreeCommentType = ElementTree.Comment("asd").tag

    class TreeWalker(base.NonRecursiveTreeWalker):  # pylint:disable=unused-variable
        """Given the particular ElementTree representation, this implementation,
        to avoid using recursion, returns "nodes" as tuples with the following
        content:

        1. The current element

        2. The index of the element relative to its parent

        3. A stack of ancestor elements

        4. A flag "text", "tail" or None to indicate if the current node is a
           text node; either the text or tail of the current element (1)
        """
        def getNodeDetails(self, node):
            if isinstance(node, tuple):  # It might be the root Element
                elt, _, _, flag = node
                if flag in ("text", "tail"):
                    return base.TEXT, getattr(elt, flag)
                else:
                    node = elt

            if not(hasattr(node, "tag")):
                node = node.getroot()

            if node.tag in ("DOCUMENT_ROOT", "DOCUMENT_FRAGMENT"):
                return (base.DOCUMENT,)

            elif node.tag == "<!DOCTYPE>":
                return (base.DOCTYPE, node.text,
                        node.get("publicId"), node.get("systemId"))

            elif node.tag == ElementTreeCommentType:
                return base.COMMENT, node.text

            else:
                assert isinstance(node.tag, string_types), type(node.tag)
                # This is assumed to be an ordinary element
                match = tag_regexp.match(node.tag)
                if match:
                    namespace, tag = match.groups()
                else:
                    namespace = None
                    tag = node.tag
                attrs = OrderedDict()
                for name, value in list(node.attrib.items()):
                    match = tag_regexp.match(name)
                    if match:
                        attrs[(match.group(1), match.group(2))] = value
                    else:
                        attrs[(None, name)] = value
                return (base.ELEMENT, namespace, tag,
                        attrs, len(node) or node.text)

        def getFirstChild(self, node):
            if isinstance(node, tuple):
                element, key, parents, flag = node
            else:
                element, key, parents, flag = node, None, [], None

            if flag in ("text", "tail"):
                return None
            else:
                if element.text:
                    return element, key, parents, "text"
                elif len(element):
                    parents.append(element)
                    return element[0], 0, parents, None
                else:
                    return None

        def getNextSibling(self, node):
            if isinstance(node, tuple):
                element, key, parents, flag = node
            else:
                return None

            if flag == "text":
                if len(element):
                    parents.append(element)
                    return element[0], 0, parents, None
                else:
                    return None
            else:
                if element.tail and flag != "tail":
                    return element, key, parents, "tail"
                elif key < len(parents[-1]) - 1:
                    return parents[-1][key + 1], key + 1, parents, None
                else:
                    return None

        def getParentNode(self, node):
            if isinstance(node, tuple):
                element, key, parents, flag = node
            else:
                return None

            if flag == "text":
                if not parents:
                    return element
                else:
                    return element, key, parents, None
            else:
                parent = parents.pop()
                if not parents:
                    return parent
                else:
                    assert list(parents[-1]).count(parent) == 1
                    return parent, list(parents[-1]).index(parent), parents, None

    return locals()

getETreeModule = moduleFactoryFactory(getETreeBuilder)

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