lib/python2/yaml/parser.py [361:587]:
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                            start_mark, end_mark)
                    self.state = self.states.pop()
                else:
                    if block:
                        node = 'block'
                    else:
                        node = 'flow'
                    token = self.peek_token()
                    raise ParserError("while parsing a %s node" % node, start_mark,
                            "expected the node content, but found %r" % token.id,
                            token.start_mark)
        return event

    # block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END

    def parse_block_sequence_first_entry(self):
        token = self.get_token()
        self.marks.append(token.start_mark)
        return self.parse_block_sequence_entry()

    def parse_block_sequence_entry(self):
        if self.check_token(BlockEntryToken):
            token = self.get_token()
            if not self.check_token(BlockEntryToken, BlockEndToken):
                self.states.append(self.parse_block_sequence_entry)
                return self.parse_block_node()
            else:
                self.state = self.parse_block_sequence_entry
                return self.process_empty_scalar(token.end_mark)
        if not self.check_token(BlockEndToken):
            token = self.peek_token()
            raise ParserError("while parsing a block collection", self.marks[-1],
                    "expected <block end>, but found %r" % token.id, token.start_mark)
        token = self.get_token()
        event = SequenceEndEvent(token.start_mark, token.end_mark)
        self.state = self.states.pop()
        self.marks.pop()
        return event

    # indentless_sequence ::= (BLOCK-ENTRY block_node?)+

    def parse_indentless_sequence_entry(self):
        if self.check_token(BlockEntryToken):
            token = self.get_token()
            if not self.check_token(BlockEntryToken,
                    KeyToken, ValueToken, BlockEndToken):
                self.states.append(self.parse_indentless_sequence_entry)
                return self.parse_block_node()
            else:
                self.state = self.parse_indentless_sequence_entry
                return self.process_empty_scalar(token.end_mark)
        token = self.peek_token()
        event = SequenceEndEvent(token.start_mark, token.start_mark)
        self.state = self.states.pop()
        return event

    # block_mapping     ::= BLOCK-MAPPING_START
    #                       ((KEY block_node_or_indentless_sequence?)?
    #                       (VALUE block_node_or_indentless_sequence?)?)*
    #                       BLOCK-END

    def parse_block_mapping_first_key(self):
        token = self.get_token()
        self.marks.append(token.start_mark)
        return self.parse_block_mapping_key()

    def parse_block_mapping_key(self):
        if self.check_token(KeyToken):
            token = self.get_token()
            if not self.check_token(KeyToken, ValueToken, BlockEndToken):
                self.states.append(self.parse_block_mapping_value)
                return self.parse_block_node_or_indentless_sequence()
            else:
                self.state = self.parse_block_mapping_value
                return self.process_empty_scalar(token.end_mark)
        if not self.check_token(BlockEndToken):
            token = self.peek_token()
            raise ParserError("while parsing a block mapping", self.marks[-1],
                    "expected <block end>, but found %r" % token.id, token.start_mark)
        token = self.get_token()
        event = MappingEndEvent(token.start_mark, token.end_mark)
        self.state = self.states.pop()
        self.marks.pop()
        return event

    def parse_block_mapping_value(self):
        if self.check_token(ValueToken):
            token = self.get_token()
            if not self.check_token(KeyToken, ValueToken, BlockEndToken):
                self.states.append(self.parse_block_mapping_key)
                return self.parse_block_node_or_indentless_sequence()
            else:
                self.state = self.parse_block_mapping_key
                return self.process_empty_scalar(token.end_mark)
        else:
            self.state = self.parse_block_mapping_key
            token = self.peek_token()
            return self.process_empty_scalar(token.start_mark)

    # flow_sequence     ::= FLOW-SEQUENCE-START
    #                       (flow_sequence_entry FLOW-ENTRY)*
    #                       flow_sequence_entry?
    #                       FLOW-SEQUENCE-END
    # flow_sequence_entry   ::= flow_node | KEY flow_node? (VALUE flow_node?)?
    #
    # Note that while production rules for both flow_sequence_entry and
    # flow_mapping_entry are equal, their interpretations are different.
    # For `flow_sequence_entry`, the part `KEY flow_node? (VALUE flow_node?)?`
    # generate an inline mapping (set syntax).

    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(FlowSequenceEndToken):
            if not first:
                if self.check_token(FlowEntryToken):
                    self.get_token()
                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 self.check_token(KeyToken):
                token = self.peek_token()
                event = MappingStartEvent(None, None, True,
                        token.start_mark, token.end_mark,
                        flow_style=True)
                self.state = self.parse_flow_sequence_entry_mapping_key
                return event
            elif not self.check_token(FlowSequenceEndToken):
                self.states.append(self.parse_flow_sequence_entry)
                return self.parse_flow_node()
        token = self.get_token()
        event = SequenceEndEvent(token.start_mark, token.end_mark)
        self.state = self.states.pop()
        self.marks.pop()
        return event

    def parse_flow_sequence_entry_mapping_key(self):
        token = self.get_token()
        if not self.check_token(ValueToken,
                FlowEntryToken, FlowSequenceEndToken):
            self.states.append(self.parse_flow_sequence_entry_mapping_value)
            return self.parse_flow_node()
        else:
            self.state = self.parse_flow_sequence_entry_mapping_value
            return self.process_empty_scalar(token.end_mark)

    def parse_flow_sequence_entry_mapping_value(self):
        if self.check_token(ValueToken):
            token = self.get_token()
            if not self.check_token(FlowEntryToken, FlowSequenceEndToken):
                self.states.append(self.parse_flow_sequence_entry_mapping_end)
                return self.parse_flow_node()
            else:
                self.state = self.parse_flow_sequence_entry_mapping_end
                return self.process_empty_scalar(token.end_mark)
        else:
            self.state = self.parse_flow_sequence_entry_mapping_end
            token = self.peek_token()
            return self.process_empty_scalar(token.start_mark)

    def parse_flow_sequence_entry_mapping_end(self):
        self.state = self.parse_flow_sequence_entry
        token = self.peek_token()
        return MappingEndEvent(token.start_mark, token.start_mark)

    # flow_mapping  ::= FLOW-MAPPING-START
    #                   (flow_mapping_entry FLOW-ENTRY)*
    #                   flow_mapping_entry?
    #                   FLOW-MAPPING-END
    # flow_mapping_entry    ::= flow_node | KEY flow_node? (VALUE flow_node?)?

    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(FlowMappingEndToken):
            if not first:
                if self.check_token(FlowEntryToken):
                    self.get_token()
                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(KeyToken):
                token = self.get_token()
                if not self.check_token(ValueToken,
                        FlowEntryToken, FlowMappingEndToken):
                    self.states.append(self.parse_flow_mapping_value)
                    return self.parse_flow_node()
                else:
                    self.state = self.parse_flow_mapping_value
                    return self.process_empty_scalar(token.end_mark)
            elif not self.check_token(FlowMappingEndToken):
                self.states.append(self.parse_flow_mapping_empty_value)
                return self.parse_flow_node()
        token = self.get_token()
        event = 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(ValueToken):
            token = self.get_token()
            if not self.check_token(FlowEntryToken, FlowMappingEndToken):
                self.states.append(self.parse_flow_mapping_key)
                return self.parse_flow_node()
            else:
                self.state = self.parse_flow_mapping_key
                return self.process_empty_scalar(token.end_mark)
        else:
            self.state = self.parse_flow_mapping_key
            token = self.peek_token()
            return self.process_empty_scalar(token.start_mark)

    def parse_flow_mapping_empty_value(self):
        self.state = self.parse_flow_mapping_key
        return self.process_empty_scalar(self.peek_token().start_mark)

    def process_empty_scalar(self, mark):
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lib/python3/yaml/parser.py [361:587]:
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                            start_mark, end_mark)
                    self.state = self.states.pop()
                else:
                    if block:
                        node = 'block'
                    else:
                        node = 'flow'
                    token = self.peek_token()
                    raise ParserError("while parsing a %s node" % node, start_mark,
                            "expected the node content, but found %r" % token.id,
                            token.start_mark)
        return event

    # block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END

    def parse_block_sequence_first_entry(self):
        token = self.get_token()
        self.marks.append(token.start_mark)
        return self.parse_block_sequence_entry()

    def parse_block_sequence_entry(self):
        if self.check_token(BlockEntryToken):
            token = self.get_token()
            if not self.check_token(BlockEntryToken, BlockEndToken):
                self.states.append(self.parse_block_sequence_entry)
                return self.parse_block_node()
            else:
                self.state = self.parse_block_sequence_entry
                return self.process_empty_scalar(token.end_mark)
        if not self.check_token(BlockEndToken):
            token = self.peek_token()
            raise ParserError("while parsing a block collection", self.marks[-1],
                    "expected <block end>, but found %r" % token.id, token.start_mark)
        token = self.get_token()
        event = SequenceEndEvent(token.start_mark, token.end_mark)
        self.state = self.states.pop()
        self.marks.pop()
        return event

    # indentless_sequence ::= (BLOCK-ENTRY block_node?)+

    def parse_indentless_sequence_entry(self):
        if self.check_token(BlockEntryToken):
            token = self.get_token()
            if not self.check_token(BlockEntryToken,
                    KeyToken, ValueToken, BlockEndToken):
                self.states.append(self.parse_indentless_sequence_entry)
                return self.parse_block_node()
            else:
                self.state = self.parse_indentless_sequence_entry
                return self.process_empty_scalar(token.end_mark)
        token = self.peek_token()
        event = SequenceEndEvent(token.start_mark, token.start_mark)
        self.state = self.states.pop()
        return event

    # block_mapping     ::= BLOCK-MAPPING_START
    #                       ((KEY block_node_or_indentless_sequence?)?
    #                       (VALUE block_node_or_indentless_sequence?)?)*
    #                       BLOCK-END

    def parse_block_mapping_first_key(self):
        token = self.get_token()
        self.marks.append(token.start_mark)
        return self.parse_block_mapping_key()

    def parse_block_mapping_key(self):
        if self.check_token(KeyToken):
            token = self.get_token()
            if not self.check_token(KeyToken, ValueToken, BlockEndToken):
                self.states.append(self.parse_block_mapping_value)
                return self.parse_block_node_or_indentless_sequence()
            else:
                self.state = self.parse_block_mapping_value
                return self.process_empty_scalar(token.end_mark)
        if not self.check_token(BlockEndToken):
            token = self.peek_token()
            raise ParserError("while parsing a block mapping", self.marks[-1],
                    "expected <block end>, but found %r" % token.id, token.start_mark)
        token = self.get_token()
        event = MappingEndEvent(token.start_mark, token.end_mark)
        self.state = self.states.pop()
        self.marks.pop()
        return event

    def parse_block_mapping_value(self):
        if self.check_token(ValueToken):
            token = self.get_token()
            if not self.check_token(KeyToken, ValueToken, BlockEndToken):
                self.states.append(self.parse_block_mapping_key)
                return self.parse_block_node_or_indentless_sequence()
            else:
                self.state = self.parse_block_mapping_key
                return self.process_empty_scalar(token.end_mark)
        else:
            self.state = self.parse_block_mapping_key
            token = self.peek_token()
            return self.process_empty_scalar(token.start_mark)

    # flow_sequence     ::= FLOW-SEQUENCE-START
    #                       (flow_sequence_entry FLOW-ENTRY)*
    #                       flow_sequence_entry?
    #                       FLOW-SEQUENCE-END
    # flow_sequence_entry   ::= flow_node | KEY flow_node? (VALUE flow_node?)?
    #
    # Note that while production rules for both flow_sequence_entry and
    # flow_mapping_entry are equal, their interpretations are different.
    # For `flow_sequence_entry`, the part `KEY flow_node? (VALUE flow_node?)?`
    # generate an inline mapping (set syntax).

    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(FlowSequenceEndToken):
            if not first:
                if self.check_token(FlowEntryToken):
                    self.get_token()
                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 self.check_token(KeyToken):
                token = self.peek_token()
                event = MappingStartEvent(None, None, True,
                        token.start_mark, token.end_mark,
                        flow_style=True)
                self.state = self.parse_flow_sequence_entry_mapping_key
                return event
            elif not self.check_token(FlowSequenceEndToken):
                self.states.append(self.parse_flow_sequence_entry)
                return self.parse_flow_node()
        token = self.get_token()
        event = SequenceEndEvent(token.start_mark, token.end_mark)
        self.state = self.states.pop()
        self.marks.pop()
        return event

    def parse_flow_sequence_entry_mapping_key(self):
        token = self.get_token()
        if not self.check_token(ValueToken,
                FlowEntryToken, FlowSequenceEndToken):
            self.states.append(self.parse_flow_sequence_entry_mapping_value)
            return self.parse_flow_node()
        else:
            self.state = self.parse_flow_sequence_entry_mapping_value
            return self.process_empty_scalar(token.end_mark)

    def parse_flow_sequence_entry_mapping_value(self):
        if self.check_token(ValueToken):
            token = self.get_token()
            if not self.check_token(FlowEntryToken, FlowSequenceEndToken):
                self.states.append(self.parse_flow_sequence_entry_mapping_end)
                return self.parse_flow_node()
            else:
                self.state = self.parse_flow_sequence_entry_mapping_end
                return self.process_empty_scalar(token.end_mark)
        else:
            self.state = self.parse_flow_sequence_entry_mapping_end
            token = self.peek_token()
            return self.process_empty_scalar(token.start_mark)

    def parse_flow_sequence_entry_mapping_end(self):
        self.state = self.parse_flow_sequence_entry
        token = self.peek_token()
        return MappingEndEvent(token.start_mark, token.start_mark)

    # flow_mapping  ::= FLOW-MAPPING-START
    #                   (flow_mapping_entry FLOW-ENTRY)*
    #                   flow_mapping_entry?
    #                   FLOW-MAPPING-END
    # flow_mapping_entry    ::= flow_node | KEY flow_node? (VALUE flow_node?)?

    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(FlowMappingEndToken):
            if not first:
                if self.check_token(FlowEntryToken):
                    self.get_token()
                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(KeyToken):
                token = self.get_token()
                if not self.check_token(ValueToken,
                        FlowEntryToken, FlowMappingEndToken):
                    self.states.append(self.parse_flow_mapping_value)
                    return self.parse_flow_node()
                else:
                    self.state = self.parse_flow_mapping_value
                    return self.process_empty_scalar(token.end_mark)
            elif not self.check_token(FlowMappingEndToken):
                self.states.append(self.parse_flow_mapping_empty_value)
                return self.parse_flow_node()
        token = self.get_token()
        event = 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(ValueToken):
            token = self.get_token()
            if not self.check_token(FlowEntryToken, FlowMappingEndToken):
                self.states.append(self.parse_flow_mapping_key)
                return self.parse_flow_node()
            else:
                self.state = self.parse_flow_mapping_key
                return self.process_empty_scalar(token.end_mark)
        else:
            self.state = self.parse_flow_mapping_key
            token = self.peek_token()
            return self.process_empty_scalar(token.start_mark)

    def parse_flow_mapping_empty_value(self):
        self.state = self.parse_flow_mapping_key
        return self.process_empty_scalar(self.peek_token().start_mark)

    def process_empty_scalar(self, mark):
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