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 : //lib64/python3.6/site-packages/yaml/serializer.py
__all__ = ['Serializer', 'SerializerError']

from .error import YAMLError
from .events import *
from .nodes import *

class SerializerError(YAMLError):
    pass

class Serializer:

    ANCHOR_TEMPLATE = 'id%03d'

    def __init__(self, encoding=None,
            explicit_start=None, explicit_end=None, version=None, tags=None):
        self.use_encoding = encoding
        self.use_explicit_start = explicit_start
        self.use_explicit_end = explicit_end
        self.use_version = version
        self.use_tags = tags
        self.serialized_nodes = {}
        self.anchors = {}
        self.last_anchor_id = 0
        self.closed = None

    def open(self):
        if self.closed is None:
            self.emit(StreamStartEvent(encoding=self.use_encoding))
            self.closed = False
        elif self.closed:
            raise SerializerError("serializer is closed")
        else:
            raise SerializerError("serializer is already opened")

    def close(self):
        if self.closed is None:
            raise SerializerError("serializer is not opened")
        elif not self.closed:
            self.emit(StreamEndEvent())
            self.closed = True

    #def __del__(self):
    #    self.close()

    def serialize(self, node):
        if self.closed is None:
            raise SerializerError("serializer is not opened")
        elif self.closed:
            raise SerializerError("serializer is closed")
        self.emit(DocumentStartEvent(explicit=self.use_explicit_start,
            version=self.use_version, tags=self.use_tags))
        self.anchor_node(node)
        self.serialize_node(node, None, None)
        self.emit(DocumentEndEvent(explicit=self.use_explicit_end))
        self.serialized_nodes = {}
        self.anchors = {}
        self.last_anchor_id = 0

    def anchor_node(self, node):
        if node in self.anchors:
            if self.anchors[node] is None:
                self.anchors[node] = self.generate_anchor(node)
        else:
            self.anchors[node] = None
            if isinstance(node, SequenceNode):
                for item in node.value:
                    self.anchor_node(item)
            elif isinstance(node, MappingNode):
                for key, value in node.value:
                    self.anchor_node(key)
                    self.anchor_node(value)

    def generate_anchor(self, node):
        self.last_anchor_id += 1
        return self.ANCHOR_TEMPLATE % self.last_anchor_id

    def serialize_node(self, node, parent, index):
        alias = self.anchors[node]
        if node in self.serialized_nodes:
            self.emit(AliasEvent(alias))
        else:
            self.serialized_nodes[node] = True
            self.descend_resolver(parent, index)
            if isinstance(node, ScalarNode):
                detected_tag = self.resolve(ScalarNode, node.value, (True, False))
                default_tag = self.resolve(ScalarNode, node.value, (False, True))
                implicit = (node.tag == detected_tag), (node.tag == default_tag)
                self.emit(ScalarEvent(alias, node.tag, implicit, node.value,
                    style=node.style))
            elif isinstance(node, SequenceNode):
                implicit = (node.tag
                            == self.resolve(SequenceNode, node.value, True))
                self.emit(SequenceStartEvent(alias, node.tag, implicit,
                    flow_style=node.flow_style))
                index = 0
                for item in node.value:
                    self.serialize_node(item, node, index)
                    index += 1
                self.emit(SequenceEndEvent())
            elif isinstance(node, MappingNode):
                implicit = (node.tag
                            == self.resolve(MappingNode, node.value, True))
                self.emit(MappingStartEvent(alias, node.tag, implicit,
                    flow_style=node.flow_style))
                for key, value in node.value:
                    self.serialize_node(key, node, None)
                    self.serialize_node(value, node, key)
                self.emit(MappingEndEvent())
            self.ascend_resolver()

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