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Edit File : parser.py \| Size : 24.90 KB
# The following YAML grammar is LL(1) and is parsed by a recursive descent # parser. # # stream ::= STREAM-START implicit_document? explicit_document* STREAM-END # implicit_document ::= block_node DOCUMENT-END* # explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END* # block_node_or_indentless_sequence ::= # ALIAS # \| properties (block_content \| indentless_block_sequence)? # \| block_content # \| indentless_block_sequence # block_node ::= ALIAS # \| properties block_content? # \| block_content # flow_node ::= ALIAS # \| properties flow_content? # \| flow_content # properties ::= TAG ANCHOR? \| ANCHOR TAG? # block_content ::= block_collection \| flow_collection \| SCALAR # flow_content ::= flow_collection \| SCALAR # block_collection ::= block_sequence \| block_mapping # flow_collection ::= flow_sequence \| flow_mapping # block_sequence ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END # indentless_sequence ::= (BLOCK-ENTRY block_node?)+ # block_mapping ::= BLOCK-MAPPING_START # ((KEY block_node_or_indentless_sequence?)? # (VALUE block_node_or_indentless_sequence?)?)* # BLOCK-END # 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?)? # 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?)? # # FIRST sets: # # stream: { STREAM-START } # explicit_document: { DIRECTIVE DOCUMENT-START } # implicit_document: FIRST(block_node) # block_node: { ALIAS TAG ANCHOR SCALAR BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START } # flow_node: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START } # block_content: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR } # flow_content: { FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR } # block_collection: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START } # flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START } # block_sequence: { BLOCK-SEQUENCE-START } # block_mapping: { BLOCK-MAPPING-START } # block_node_or_indentless_sequence: { ALIAS ANCHOR TAG SCALAR BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START BLOCK-ENTRY } # indentless_sequence: { ENTRY } # flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START } # flow_sequence: { FLOW-SEQUENCE-START } # flow_mapping: { FLOW-MAPPING-START } # flow_sequence_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START KEY } # flow_mapping_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START KEY } __all__ = ['Parser', 'ParserError'] from .error import MarkedYAMLError from .tokens import * from .events import * from .scanner import * class ParserError(MarkedYAMLError): pass class Parser: # Since writing a recursive-descendant parser is a straightforward task, we # do not give many comments here. DEFAULT_TAGS = { '!': '!', '!!': 'tag:yaml.org,2002:', } def __init__(self): self.current_event = None self.yaml_version = None self.tag_handles = {} 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 = 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(DirectiveToken, DocumentStartToken, StreamEndToken): self.tag_handles = self.DEFAULT_TAGS token = self.peek_token() start_mark = end_mark = token.start_mark event = DocumentStartEvent(start_mark, end_mark, explicit=False) # Prepare the next state. self.states.append(self.parse_document_end) self.state = self.parse_block_node return event else: return self.parse_document_start() def parse_document_start(self): # Parse any extra document end indicators. while self.check_token(DocumentEndToken): self.get_token() # Parse an explicit document. if not self.check_token(StreamEndToken): token = self.peek_token() start_mark = token.start_mark version, tags = self.process_directives() if not self.check_token(DocumentStartToken): raise ParserError(None, None, "expected '<document start>', but found %r" % self.peek_token().id, self.peek_token().start_mark) token = self.get_token() end_mark = token.end_mark event = DocumentStartEvent(start_mark, end_mark, explicit=True, version=version, tags=tags) self.states.append(self.parse_document_end) self.state = self.parse_document_content else: # Parse the end of the stream. token = self.get_token() event = 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 if self.check_token(DocumentEndToken): token = self.get_token() end_mark = token.end_mark explicit = True event = DocumentEndEvent(start_mark, end_mark, explicit=explicit) # Prepare the next state. self.state = self.parse_document_start return event def parse_document_content(self): if self.check_token(DirectiveToken, DocumentStartToken, DocumentEndToken, StreamEndToken): event = self.process_empty_scalar(self.peek_token().start_mark) self.state = self.states.pop() return event else: return self.parse_block_node() def process_directives(self): self.yaml_version = None self.tag_handles = {} while self.check_token(DirectiveToken): token = self.get_token() if token.name == 'YAML': if self.yaml_version is not None: raise ParserError(None, None, "found duplicate YAML directive", token.start_mark) major, minor = token.value if major != 1: raise ParserError(None, None, "found incompatible YAML document (version 1.* is required)", token.start_mark) self.yaml_version = token.value elif token.name == 'TAG': handle, prefix = token.value if handle in self.tag_handles: raise ParserError(None, None, "duplicate tag handle %r" % handle, token.start_mark) self.tag_handles[handle] = prefix if self.tag_handles: value = self.yaml_version, self.tag_handles.copy() else: value = self.yaml_version, None for key in self.DEFAULT_TAGS: if key not in self.tag_handles: self.tag_handles[key] = self.DEFAULT_TAGS[key] return value # block_node_or_indentless_sequence ::= ALIAS # \| properties (block_content \| indentless_block_sequence)? # \| block_content # \| indentless_block_sequence # block_node ::= ALIAS # \| properties block_content? # \| block_content # flow_node ::= ALIAS # \| properties flow_content? # \| flow_content # properties ::= TAG ANCHOR? \| ANCHOR TAG? # block_content ::= block_collection \| flow_collection \| SCALAR # flow_content ::= flow_collection \| SCALAR # block_collection ::= block_sequence \| block_mapping # flow_collection ::= flow_sequence \| flow_mapping def parse_block_node(self): return self.parse_node(block=True) def parse_flow_node(self): return self.parse_node() def parse_block_node_or_indentless_sequence(self): return self.parse_node(block=True, indentless_sequence=True) def parse_node(self, block=False, indentless_sequence=False): if self.check_token(AliasToken): token = self.get_token() event = AliasEvent(token.value, token.start_mark, token.end_mark) self.state = self.states.pop() else: anchor = None tag = None start_mark = end_mark = tag_mark = None if self.check_token(AnchorToken): token = self.get_token() start_mark = token.start_mark end_mark = token.end_mark anchor = token.value if self.check_token(TagToken): token = self.get_token() tag_mark = token.start_mark end_mark = token.end_mark tag = token.value elif self.check_token(TagToken): token = self.get_token() start_mark = tag_mark = token.start_mark end_mark = token.end_mark tag = token.value if self.check_token(AnchorToken): token = self.get_token() end_mark = token.end_mark anchor = token.value if tag is not None: handle, suffix = tag if handle is not None: if handle not in self.tag_handles: raise ParserError("while parsing a node", start_mark, "found undefined tag handle %r" % handle, tag_mark) tag = self.tag_handles[handle]+suffix else: tag = suffix #if tag == '!': # raise ParserError("while parsing a node", start_mark, # "found non-specific tag '!'", tag_mark, # "Please check 'http://pyyaml.org/wiki/YAMLNonSpecificTag' and share your opinion.") if start_mark is None: start_mark = end_mark = self.peek_token().start_mark event = None implicit = (tag is None or tag == '!') if indentless_sequence and self.check_token(BlockEntryToken): end_mark = self.peek_token().end_mark event = SequenceStartEvent(anchor, tag, implicit, start_mark, end_mark) self.state = self.parse_indentless_sequence_entry else: if self.check_token(ScalarToken): token = self.get_token() end_mark = token.end_mark if (token.plain and tag is None) or tag == '!': implicit = (True, False) elif tag is None: implicit = (False, True) else: implicit = (False, False) event = ScalarEvent(anchor, tag, implicit, token.value, start_mark, end_mark, style=token.style) self.state = self.states.pop() elif self.check_token(FlowSequenceStartToken): end_mark = self.peek_token().end_mark event = SequenceStartEvent(anchor, tag, implicit, start_mark, end_mark, flow_style=True) self.state = self.parse_flow_sequence_first_entry elif self.check_token(FlowMappingStartToken): end_mark = self.peek_token().end_mark event = MappingStartEvent(anchor, tag, implicit, start_mark, end_mark, flow_style=True) self.state = self.parse_flow_mapping_first_key elif block and self.check_token(BlockSequenceStartToken): end_mark = self.peek_token().start_mark event = SequenceStartEvent(anchor, tag, implicit, start_mark, end_mark, flow_style=False) self.state = self.parse_block_sequence_first_entry elif block and self.check_token(BlockMappingStartToken): end_mark = self.peek_token().start_mark event = MappingStartEvent(anchor, tag, implicit, start_mark, end_mark, flow_style=False) self.state = self.parse_block_mapping_first_key elif anchor is not None or tag is not None: # Empty scalars are allowed even if a tag or an anchor is # specified. event = ScalarEvent(anchor, tag, (implicit, False), '', 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): return ScalarEvent(None, None, (True, False), '', mark, mark) Back

Edit File : parser.py | Size : 24.90 KB

# The following YAML grammar is LL(1) and is parsed by a recursive descent
# parser.
#
# stream            ::= STREAM-START implicit_document? explicit_document* STREAM-END
# implicit_document ::= block_node DOCUMENT-END*
# explicit_document ::= DIRECTIVE* DOCUMENT-START block_node? DOCUMENT-END*
# block_node_or_indentless_sequence ::=
#                       ALIAS
#                       | properties (block_content | indentless_block_sequence)?
#                       | block_content
#                       | indentless_block_sequence
# block_node        ::= ALIAS
#                       | properties block_content?
#                       | block_content
# flow_node         ::= ALIAS
#                       | properties flow_content?
#                       | flow_content
# properties        ::= TAG ANCHOR? | ANCHOR TAG?
# block_content     ::= block_collection | flow_collection | SCALAR
# flow_content      ::= flow_collection | SCALAR
# block_collection  ::= block_sequence | block_mapping
# flow_collection   ::= flow_sequence | flow_mapping
# block_sequence    ::= BLOCK-SEQUENCE-START (BLOCK-ENTRY block_node?)* BLOCK-END
# indentless_sequence   ::= (BLOCK-ENTRY block_node?)+
# block_mapping     ::= BLOCK-MAPPING_START
#                       ((KEY block_node_or_indentless_sequence?)?
#                       (VALUE block_node_or_indentless_sequence?)?)*
#                       BLOCK-END
# 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?)?
# 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?)?
#
# FIRST sets:
#
# stream: { STREAM-START }
# explicit_document: { DIRECTIVE DOCUMENT-START }
# implicit_document: FIRST(block_node)
# block_node: { ALIAS TAG ANCHOR SCALAR BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START }
# flow_node: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START }
# block_content: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR }
# flow_content: { FLOW-SEQUENCE-START FLOW-MAPPING-START SCALAR }
# block_collection: { BLOCK-SEQUENCE-START BLOCK-MAPPING-START }
# flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START }
# block_sequence: { BLOCK-SEQUENCE-START }
# block_mapping: { BLOCK-MAPPING-START }
# block_node_or_indentless_sequence: { ALIAS ANCHOR TAG SCALAR BLOCK-SEQUENCE-START BLOCK-MAPPING-START FLOW-SEQUENCE-START FLOW-MAPPING-START BLOCK-ENTRY }
# indentless_sequence: { ENTRY }
# flow_collection: { FLOW-SEQUENCE-START FLOW-MAPPING-START }
# flow_sequence: { FLOW-SEQUENCE-START }
# flow_mapping: { FLOW-MAPPING-START }
# flow_sequence_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START KEY }
# flow_mapping_entry: { ALIAS ANCHOR TAG SCALAR FLOW-SEQUENCE-START FLOW-MAPPING-START KEY }

__all__ = ['Parser', 'ParserError']

from .error import MarkedYAMLError
from .tokens import *
from .events import *
from .scanner import *

class ParserError(MarkedYAMLError):
    pass

class Parser:
    # Since writing a recursive-descendant parser is a straightforward task, we
    # do not give many comments here.

DEFAULT_TAGS = {
        '!':   '!',
        '!!':  'tag:yaml.org,2002:',
    }

def __init__(self):
        self.current_event = None
        self.yaml_version = None
        self.tag_handles = {}
        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 = 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(DirectiveToken, DocumentStartToken,
                StreamEndToken):
            self.tag_handles = self.DEFAULT_TAGS
            token = self.peek_token()
            start_mark = end_mark = token.start_mark
            event = DocumentStartEvent(start_mark, end_mark,
                    explicit=False)

# Prepare the next state.
            self.states.append(self.parse_document_end)
            self.state = self.parse_block_node

return event

else:
            return self.parse_document_start()

def parse_document_start(self):

# Parse any extra document end indicators.
        while self.check_token(DocumentEndToken):
            self.get_token()

# Parse an explicit document.
        if not self.check_token(StreamEndToken):
            token = self.peek_token()
            start_mark = token.start_mark
            version, tags = self.process_directives()
            if not self.check_token(DocumentStartToken):
                raise ParserError(None, None,
                        "expected '<document start>', but found %r"
                        % self.peek_token().id,
                        self.peek_token().start_mark)
            token = self.get_token()
            end_mark = token.end_mark
            event = DocumentStartEvent(start_mark, end_mark,
                    explicit=True, version=version, tags=tags)
            self.states.append(self.parse_document_end)
            self.state = self.parse_document_content
        else:
            # Parse the end of the stream.
            token = self.get_token()
            event = 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
        if self.check_token(DocumentEndToken):
            token = self.get_token()
            end_mark = token.end_mark
            explicit = True
        event = DocumentEndEvent(start_mark, end_mark,
                explicit=explicit)

# Prepare the next state.
        self.state = self.parse_document_start

return event

def parse_document_content(self):
        if self.check_token(DirectiveToken,
                DocumentStartToken, DocumentEndToken, StreamEndToken):
            event = self.process_empty_scalar(self.peek_token().start_mark)
            self.state = self.states.pop()
            return event
        else:
            return self.parse_block_node()

def process_directives(self):
        self.yaml_version = None
        self.tag_handles = {}
        while self.check_token(DirectiveToken):
            token = self.get_token()
            if token.name == 'YAML':
                if self.yaml_version is not None:
                    raise ParserError(None, None,
                            "found duplicate YAML directive", token.start_mark)
                major, minor = token.value
                if major != 1:
                    raise ParserError(None, None,
                            "found incompatible YAML document (version 1.* is required)",
                            token.start_mark)
                self.yaml_version = token.value
            elif token.name == 'TAG':
                handle, prefix = token.value
                if handle in self.tag_handles:
                    raise ParserError(None, None,
                            "duplicate tag handle %r" % handle,
                            token.start_mark)
                self.tag_handles[handle] = prefix
        if self.tag_handles:
            value = self.yaml_version, self.tag_handles.copy()
        else:
            value = self.yaml_version, None
        for key in self.DEFAULT_TAGS:
            if key not in self.tag_handles:
                self.tag_handles[key] = self.DEFAULT_TAGS[key]
        return value

def parse_block_node(self):
        return self.parse_node(block=True)

def parse_flow_node(self):
        return self.parse_node()

def parse_block_node_or_indentless_sequence(self):
        return self.parse_node(block=True, indentless_sequence=True)

def parse_node(self, block=False, indentless_sequence=False):
        if self.check_token(AliasToken):
            token = self.get_token()
            event = AliasEvent(token.value, token.start_mark, token.end_mark)
            self.state = self.states.pop()
        else:
            anchor = None
            tag = None
            start_mark = end_mark = tag_mark = None
            if self.check_token(AnchorToken):
                token = self.get_token()
                start_mark = token.start_mark
                end_mark = token.end_mark
                anchor = token.value
                if self.check_token(TagToken):
                    token = self.get_token()
                    tag_mark = token.start_mark
                    end_mark = token.end_mark
                    tag = token.value
            elif self.check_token(TagToken):
                token = self.get_token()
                start_mark = tag_mark = token.start_mark
                end_mark = token.end_mark
                tag = token.value
                if self.check_token(AnchorToken):
                    token = self.get_token()
                    end_mark = token.end_mark
                    anchor = token.value
            if tag is not None:
                handle, suffix = tag
                if handle is not None:
                    if handle not in self.tag_handles:
                        raise ParserError("while parsing a node", start_mark,
                                "found undefined tag handle %r" % handle,
                                tag_mark)
                    tag = self.tag_handles[handle]+suffix
                else:
                    tag = suffix
            #if tag == '!':
            #    raise ParserError("while parsing a node", start_mark,
            #            "found non-specific tag '!'", tag_mark,
            #            "Please check 'http://pyyaml.org/wiki/YAMLNonSpecificTag' and share your opinion.")
            if start_mark is None:
                start_mark = end_mark = self.peek_token().start_mark
            event = None
            implicit = (tag is None or tag == '!')
            if indentless_sequence and self.check_token(BlockEntryToken):
                end_mark = self.peek_token().end_mark
                event = SequenceStartEvent(anchor, tag, implicit,
                        start_mark, end_mark)
                self.state = self.parse_indentless_sequence_entry
            else:
                if self.check_token(ScalarToken):
                    token = self.get_token()
                    end_mark = token.end_mark
                    if (token.plain and tag is None) or tag == '!':
                        implicit = (True, False)
                    elif tag is None:
                        implicit = (False, True)
                    else:
                        implicit = (False, False)
                    event = ScalarEvent(anchor, tag, implicit, token.value,
                            start_mark, end_mark, style=token.style)
                    self.state = self.states.pop()
                elif self.check_token(FlowSequenceStartToken):
                    end_mark = self.peek_token().end_mark
                    event = SequenceStartEvent(anchor, tag, implicit,
                            start_mark, end_mark, flow_style=True)
                    self.state = self.parse_flow_sequence_first_entry
                elif self.check_token(FlowMappingStartToken):
                    end_mark = self.peek_token().end_mark
                    event = MappingStartEvent(anchor, tag, implicit,
                            start_mark, end_mark, flow_style=True)
                    self.state = self.parse_flow_mapping_first_key
                elif block and self.check_token(BlockSequenceStartToken):
                    end_mark = self.peek_token().start_mark
                    event = SequenceStartEvent(anchor, tag, implicit,
                            start_mark, end_mark, flow_style=False)
                    self.state = self.parse_block_sequence_first_entry
                elif block and self.check_token(BlockMappingStartToken):
                    end_mark = self.peek_token().start_mark
                    event = MappingStartEvent(anchor, tag, implicit,
                            start_mark, end_mark, flow_style=False)
                    self.state = self.parse_block_mapping_first_key
                elif anchor is not None or tag is not None:
                    # Empty scalars are allowed even if a tag or an anchor is
                    # specified.
                    event = ScalarEvent(anchor, tag, (implicit, False), '',
                            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):
        return ScalarEvent(None, None, (True, False), '', mark, mark)

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