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# coding: utf-8
from __future__ import absolute_import
from ruamel.yaml.error import YAMLError
from ruamel.yaml.compat import nprint, DBG_NODE, dbg, string_types
from ruamel.yaml.util import RegExp
from ruamel.yaml.events import (
StreamStartEvent,
StreamEndEvent,
MappingStartEvent,
MappingEndEvent,
SequenceStartEvent,
SequenceEndEvent,
AliasEvent,
ScalarEvent,
DocumentStartEvent,
DocumentEndEvent,
)
from ruamel.yaml.nodes import MappingNode, ScalarNode, SequenceNode
if False: # MYPY
from typing import Any, Dict, Union, Text, Optional # NOQA
from ruamel.yaml.compat import VersionType # NOQA
__all__ = ['Serializer', 'SerializerError']
class SerializerError(YAMLError):
pass
class Serializer(object):
# 'id' and 3+ numbers, but not 000
ANCHOR_TEMPLATE = u'id%03d'
ANCHOR_RE = RegExp(u'id(?!000$)\\d{3,}')
def __init__(
self,
encoding=None,
explicit_start=None,
explicit_end=None,
version=None,
tags=None,
dumper=None,
):
# type: (Any, Optional[bool], Optional[bool], Optional[VersionType], Any, Any) -> None # NOQA
self.dumper = dumper
if self.dumper is not None:
self.dumper._serializer = self
self.use_encoding = encoding
self.use_explicit_start = explicit_start
self.use_explicit_end = explicit_end
if isinstance(version, string_types):
self.use_version = tuple(map(int, version.split('.')))
else:
self.use_version = version # type: ignore
self.use_tags = tags
self.serialized_nodes = {} # type: Dict[Any, Any]
self.anchors = {} # type: Dict[Any, Any]
self.last_anchor_id = 0
self.closed = None # type: Optional[bool]
self._templated_id = None
@property
def emitter(self):
# type: () -> Any
if hasattr(self.dumper, 'typ'):
return self.dumper.emitter
return self.dumper._emitter
@property
def resolver(self):
# type: () -> Any
if hasattr(self.dumper, 'typ'):
self.dumper.resolver
return self.dumper._resolver
def open(self):
# type: () -> None
if self.closed is None:
self.emitter.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):
# type: () -> None
if self.closed is None:
raise SerializerError('serializer is not opened')
elif not self.closed:
self.emitter.emit(StreamEndEvent())
self.closed = True
# def __del__(self):
# self.close()
def serialize(self, node):
# type: (Any) -> None
if dbg(DBG_NODE):
nprint('Serializing nodes')
node.dump()
if self.closed is None:
raise SerializerError('serializer is not opened')
elif self.closed:
raise SerializerError('serializer is closed')
self.emitter.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.emitter.emit(DocumentEndEvent(explicit=self.use_explicit_end))
self.serialized_nodes = {}
self.anchors = {}
self.last_anchor_id = 0
def anchor_node(self, node):
# type: (Any) -> None
if node in self.anchors:
if self.anchors[node] is None:
self.anchors[node] = self.generate_anchor(node)
else:
anchor = None
try:
if node.anchor.always_dump:
anchor = node.anchor.value
except: # NOQA
pass
self.anchors[node] = anchor
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):
# type: (Any) -> Any
try:
anchor = node.anchor.value
except: # NOQA
anchor = None
if anchor is None:
self.last_anchor_id += 1
return self.ANCHOR_TEMPLATE % self.last_anchor_id
return anchor
def serialize_node(self, node, parent, index):
# type: (Any, Any, Any) -> None
alias = self.anchors[node]
if node in self.serialized_nodes:
self.emitter.emit(AliasEvent(alias))
else:
self.serialized_nodes[node] = True
self.resolver.descend_resolver(parent, index)
if isinstance(node, ScalarNode):
# here check if the node.tag equals the one that would result from parsing
# if not equal quoting is necessary for strings
detected_tag = self.resolver.resolve(ScalarNode, node.value, (True, False))
default_tag = self.resolver.resolve(ScalarNode, node.value, (False, True))
implicit = (
(node.tag == detected_tag),
(node.tag == default_tag),
node.tag.startswith('tag:yaml.org,2002:'),
)
self.emitter.emit(
ScalarEvent(
alias,
node.tag,
implicit,
node.value,
style=node.style,
comment=node.comment,
)
)
elif isinstance(node, SequenceNode):
implicit = node.tag == self.resolver.resolve(SequenceNode, node.value, True)
comment = node.comment
end_comment = None
seq_comment = None
if node.flow_style is True:
if comment: # eol comment on flow style sequence
seq_comment = comment[0]
# comment[0] = None
if comment and len(comment) > 2:
end_comment = comment[2]
else:
end_comment = None
self.emitter.emit(
SequenceStartEvent(
alias,
node.tag,
implicit,
flow_style=node.flow_style,
comment=node.comment,
)
)
index = 0
for item in node.value:
self.serialize_node(item, node, index)
index += 1
self.emitter.emit(SequenceEndEvent(comment=[seq_comment, end_comment]))
elif isinstance(node, MappingNode):
implicit = node.tag == self.resolver.resolve(MappingNode, node.value, True)
comment = node.comment
end_comment = None
map_comment = None
if node.flow_style is True:
if comment: # eol comment on flow style sequence
map_comment = comment[0]
# comment[0] = None
if comment and len(comment) > 2:
end_comment = comment[2]
self.emitter.emit(
MappingStartEvent(
alias,
node.tag,
implicit,
flow_style=node.flow_style,
comment=node.comment,
nr_items=len(node.value),
)
)
for key, value in node.value:
self.serialize_node(key, node, None)
self.serialize_node(value, node, key)
self.emitter.emit(MappingEndEvent(comment=[map_comment, end_comment]))
self.resolver.ascend_resolver()
def templated_id(s):
# type: (Text) -> Any
return Serializer.ANCHOR_RE.match(s)
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