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# vim:fileencoding=utf-8:noet
from __future__ import (unicode_literals, division, absolute_import, print_function)
from powerline.lint.markedjson.error import MarkedError
from powerline.lint.markedjson import tokens
from powerline.lint.markedjson import events
class ParserError(MarkedError):
pass
class Parser:
def __init__(self):
self.current_event = None
self.yaml_version = None
self.states = []
self.marks = []
self.state = self.parse_stream_start
def dispose(self):
# Reset the state attributes (to clear self-references)
self.states = []
self.state = None
def check_event(self, *choices):
# Check the type of the next event.
if self.current_event is None:
if self.state:
self.current_event = self.state()
if self.current_event is not None:
if not choices:
return True
for choice in choices:
if isinstance(self.current_event, choice):
return True
return False
def peek_event(self):
# Get the next event.
if self.current_event is None:
if self.state:
self.current_event = self.state()
return self.current_event
def get_event(self):
# Get the next event and proceed further.
if self.current_event is None:
if self.state:
self.current_event = self.state()
value = self.current_event
self.current_event = None
return value
# stream ::= STREAM-START implicit_document? explicit_document* STREAM-END
# implicit_document ::= block_node DOCUMENT-END*
# explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
def parse_stream_start(self):
# Parse the stream start.
token = self.get_token()
event = events.StreamStartEvent(token.start_mark, token.end_mark, encoding=token.encoding)
# Prepare the next state.
self.state = self.parse_implicit_document_start
return event
def parse_implicit_document_start(self):
# Parse an implicit document.
if not self.check_token(tokens.StreamEndToken):
token = self.peek_token()
start_mark = end_mark = token.start_mark
event = events.DocumentStartEvent(start_mark, end_mark, explicit=False)
# Prepare the next state.
self.states.append(self.parse_document_end)
self.state = self.parse_node
return event
else:
return self.parse_document_start()
def parse_document_start(self):
# Parse an explicit document.
if not self.check_token(tokens.StreamEndToken):
token = self.peek_token()
self.echoerr(
None, None,
('expected \'<stream end>\', but found %r' % token.id), token.start_mark
)
return events.StreamEndEvent(token.start_mark, token.end_mark)
else:
# Parse the end of the stream.
token = self.get_token()
event = events.StreamEndEvent(token.start_mark, token.end_mark)
assert not self.states
assert not self.marks
self.state = None
return event
def parse_document_end(self):
# Parse the document end.
token = self.peek_token()
start_mark = end_mark = token.start_mark
explicit = False
event = events.DocumentEndEvent(start_mark, end_mark, explicit=explicit)
# Prepare the next state.
self.state = self.parse_document_start
return event
def parse_document_content(self):
return self.parse_node()
def parse_node(self, indentless_sequence=False):
start_mark = end_mark = None
if start_mark is None:
start_mark = end_mark = self.peek_token().start_mark
event = None
implicit = True
if self.check_token(tokens.ScalarToken):
token = self.get_token()
end_mark = token.end_mark
if token.plain:
implicit = (True, False)
else:
implicit = (False, True)
event = events.ScalarEvent(implicit, token.value, start_mark, end_mark, style=token.style)
self.state = self.states.pop()
elif self.check_token(tokens.FlowSequenceStartToken):
end_mark = self.peek_token().end_mark
event = events.SequenceStartEvent(implicit, start_mark, end_mark, flow_style=True)
self.state = self.parse_flow_sequence_first_entry
elif self.check_token(tokens.FlowMappingStartToken):
end_mark = self.peek_token().end_mark
event = events.MappingStartEvent(implicit, start_mark, end_mark, flow_style=True)
self.state = self.parse_flow_mapping_first_key
else:
token = self.peek_token()
raise ParserError(
'while parsing a flow node', start_mark,
'expected the node content, but found %r' % token.id,
token.start_mark
)
return event
def parse_flow_sequence_first_entry(self):
token = self.get_token()
self.marks.append(token.start_mark)
return self.parse_flow_sequence_entry(first=True)
def parse_flow_sequence_entry(self, first=False):
if not self.check_token(tokens.FlowSequenceEndToken):
if not first:
if self.check_token(tokens.FlowEntryToken):
self.get_token()
if self.check_token(tokens.FlowSequenceEndToken):
token = self.peek_token()
self.echoerr(
'While parsing a flow sequence', self.marks[-1],
('expected sequence value, but got %r' % token.id), token.start_mark
)
else:
token = self.peek_token()
raise ParserError(
'while parsing a flow sequence', self.marks[-1],
('expected \',\' or \']\', but got %r' % token.id), token.start_mark
)
if not self.check_token(tokens.FlowSequenceEndToken):
self.states.append(self.parse_flow_sequence_entry)
return self.parse_node()
token = self.get_token()
event = events.SequenceEndEvent(token.start_mark, token.end_mark)
self.state = self.states.pop()
self.marks.pop()
return event
def parse_flow_sequence_entry_mapping_end(self):
self.state = self.parse_flow_sequence_entry
token = self.peek_token()
return events.MappingEndEvent(token.start_mark, token.start_mark)
def parse_flow_mapping_first_key(self):
token = self.get_token()
self.marks.append(token.start_mark)
return self.parse_flow_mapping_key(first=True)
def parse_flow_mapping_key(self, first=False):
if not self.check_token(tokens.FlowMappingEndToken):
if not first:
if self.check_token(tokens.FlowEntryToken):
self.get_token()
if self.check_token(tokens.FlowMappingEndToken):
token = self.peek_token()
self.echoerr(
'While parsing a flow mapping', self.marks[-1],
('expected mapping key, but got %r' % token.id), token.start_mark
)
else:
token = self.peek_token()
raise ParserError(
'while parsing a flow mapping', self.marks[-1],
('expected \',\' or \'}\', but got %r' % token.id), token.start_mark
)
if self.check_token(tokens.KeyToken):
token = self.get_token()
if not self.check_token(tokens.ValueToken, tokens.FlowEntryToken, tokens.FlowMappingEndToken):
self.states.append(self.parse_flow_mapping_value)
return self.parse_node()
else:
token = self.peek_token()
raise ParserError(
'while parsing a flow mapping', self.marks[-1],
('expected value, but got %r' % token.id), token.start_mark
)
elif not self.check_token(tokens.FlowMappingEndToken):
token = self.peek_token()
expect_key = self.check_token(tokens.ValueToken, tokens.FlowEntryToken)
if not expect_key:
self.get_token()
expect_key = self.check_token(tokens.ValueToken)
if expect_key:
raise ParserError(
'while parsing a flow mapping', self.marks[-1],
('expected string key, but got %r' % token.id), token.start_mark
)
else:
token = self.peek_token()
raise ParserError(
'while parsing a flow mapping', self.marks[-1],
('expected \':\', but got %r' % token.id), token.start_mark
)
token = self.get_token()
event = events.MappingEndEvent(token.start_mark, token.end_mark)
self.state = self.states.pop()
self.marks.pop()
return event
def parse_flow_mapping_value(self):
if self.check_token(tokens.ValueToken):
token = self.get_token()
if not self.check_token(tokens.FlowEntryToken, tokens.FlowMappingEndToken):
self.states.append(self.parse_flow_mapping_key)
return self.parse_node()
token = self.peek_token()
raise ParserError(
'while parsing a flow mapping', self.marks[-1],
('expected mapping value, but got %r' % token.id), token.start_mark
)
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