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# coding: utf-8
import warnings
from ruamel.yaml.error import MarkedYAMLError, ReusedAnchorWarning
from ruamel.yaml.compat import nprint, nprintf # NOQA
from ruamel.yaml.events import (
StreamStartEvent,
StreamEndEvent,
MappingStartEvent,
MappingEndEvent,
SequenceStartEvent,
SequenceEndEvent,
AliasEvent,
ScalarEvent,
)
from ruamel.yaml.nodes import MappingNode, ScalarNode, SequenceNode
from typing import Any, Dict, Optional, List # NOQA
__all__ = ['Composer', 'ComposerError']
class ComposerError(MarkedYAMLError):
pass
class Composer:
def __init__(self, loader: Any = None) -> None:
self.loader = loader
if self.loader is not None and getattr(self.loader, '_composer', None) is None:
self.loader._composer = self
self.anchors: Dict[Any, Any] = {}
@property
def parser(self) -> Any:
if hasattr(self.loader, 'typ'):
self.loader.parser
return self.loader._parser
@property
def resolver(self) -> Any:
# assert self.loader._resolver is not None
if hasattr(self.loader, 'typ'):
self.loader.resolver
return self.loader._resolver
def check_node(self) -> Any:
# Drop the STREAM-START event.
if self.parser.check_event(StreamStartEvent):
self.parser.get_event()
# If there are more documents available?
return not self.parser.check_event(StreamEndEvent)
def get_node(self) -> Any:
# Get the root node of the next document.
if not self.parser.check_event(StreamEndEvent):
return self.compose_document()
def get_single_node(self) -> Any:
# Drop the STREAM-START event.
self.parser.get_event()
# Compose a document if the stream is not empty.
document: Any = None
if not self.parser.check_event(StreamEndEvent):
document = self.compose_document()
# Ensure that the stream contains no more documents.
if not self.parser.check_event(StreamEndEvent):
event = self.parser.get_event()
raise ComposerError(
'expected a single document in the stream',
document.start_mark,
'but found another document',
event.start_mark,
)
# Drop the STREAM-END event.
self.parser.get_event()
return document
def compose_document(self: Any) -> Any:
# Drop the DOCUMENT-START event.
self.parser.get_event()
# Compose the root node.
node = self.compose_node(None, None)
# Drop the DOCUMENT-END event.
self.parser.get_event()
self.anchors = {}
return node
def return_alias(self, a: Any) -> Any:
return a
def compose_node(self, parent: Any, index: Any) -> Any:
if self.parser.check_event(AliasEvent):
event = self.parser.get_event()
alias = event.anchor
if alias not in self.anchors:
raise ComposerError(
None, None, f'found undefined alias {alias!r}', event.start_mark,
)
return self.return_alias(self.anchors[alias])
event = self.parser.peek_event()
anchor = event.anchor
if anchor is not None: # have an anchor
if anchor in self.anchors:
ws = (
f'\nfound duplicate anchor {anchor!r}\n'
f'first occurrence {self.anchors[anchor].start_mark}\n'
f'second occurrence {event.start_mark}'
)
warnings.warn(ws, ReusedAnchorWarning, stacklevel=2)
self.resolver.descend_resolver(parent, index)
if self.parser.check_event(ScalarEvent):
node = self.compose_scalar_node(anchor)
elif self.parser.check_event(SequenceStartEvent):
node = self.compose_sequence_node(anchor)
elif self.parser.check_event(MappingStartEvent):
node = self.compose_mapping_node(anchor)
self.resolver.ascend_resolver()
return node
def compose_scalar_node(self, anchor: Any) -> Any:
event = self.parser.get_event()
tag = event.tag
if tag is None or tag == '!':
tag = self.resolver.resolve(ScalarNode, event.value, event.implicit)
node = ScalarNode(
tag,
event.value,
event.start_mark,
event.end_mark,
style=event.style,
comment=event.comment,
anchor=anchor,
)
if anchor is not None:
self.anchors[anchor] = node
return node
def compose_sequence_node(self, anchor: Any) -> Any:
start_event = self.parser.get_event()
tag = start_event.tag
if tag is None or tag == '!':
tag = self.resolver.resolve(SequenceNode, None, start_event.implicit)
node = SequenceNode(
tag,
[],
start_event.start_mark,
None,
flow_style=start_event.flow_style,
comment=start_event.comment,
anchor=anchor,
)
if anchor is not None:
self.anchors[anchor] = node
index = 0
while not self.parser.check_event(SequenceEndEvent):
node.value.append(self.compose_node(node, index))
index += 1
end_event = self.parser.get_event()
if node.flow_style is True and end_event.comment is not None:
if node.comment is not None:
x = node.flow_style
nprint(
f'Warning: unexpected end_event commment in sequence node {x}'
)
node.comment = end_event.comment
node.end_mark = end_event.end_mark
self.check_end_doc_comment(end_event, node)
return node
def compose_mapping_node(self, anchor: Any) -> Any:
start_event = self.parser.get_event()
tag = start_event.tag
if tag is None or tag == '!':
tag = self.resolver.resolve(MappingNode, None, start_event.implicit)
node = MappingNode(
tag,
[],
start_event.start_mark,
None,
flow_style=start_event.flow_style,
comment=start_event.comment,
anchor=anchor,
)
if anchor is not None:
self.anchors[anchor] = node
while not self.parser.check_event(MappingEndEvent):
# key_event = self.parser.peek_event()
item_key = self.compose_node(node, None)
# if item_key in node.value:
# raise ComposerError("while composing a mapping",
# start_event.start_mark,
# "found duplicate key", key_event.start_mark)
item_value = self.compose_node(node, item_key)
# node.value[item_key] = item_value
node.value.append((item_key, item_value))
end_event = self.parser.get_event()
if node.flow_style is True and end_event.comment is not None:
node.comment = end_event.comment
node.end_mark = end_event.end_mark
self.check_end_doc_comment(end_event, node)
return node
def check_end_doc_comment(self, end_event: Any, node: Any) -> None:
if end_event.comment and end_event.comment[1]:
# pre comments on an end_event, no following to move to
if node.comment is None:
node.comment = [None, None]
assert not isinstance(node, ScalarEvent)
# this is a post comment on a mapping node, add as third element
# in the list
node.comment.append(end_event.comment[1])
end_event.comment[1] = None
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