path: root/contrib/python/ruamel.yaml.clib/py3/_ruamel_yaml.pyx

def get_version_string():
    cdef char *value
    value = yaml_get_version_string()
    if PY_MAJOR_VERSION < 3:
        return value
    else:
        return PyUnicode_FromString(value)

def get_version():
    cdef int major, minor, patch
    yaml_get_version(&major, &minor, &patch)
    return (major, minor, patch)

#Mark = yaml.error.Mark
from ruamel.yaml.error import YAMLError
from ruamel.yaml.reader import ReaderError
from ruamel.yaml.scanner import ScannerError
from ruamel.yaml.parser import ParserError
from ruamel.yaml.composer import ComposerError
from ruamel.yaml.constructor import ConstructorError
from ruamel.yaml.emitter import EmitterError
from ruamel.yaml.serializer import SerializerError
from ruamel.yaml.representer import RepresenterError

from ruamel.yaml.tokens import StreamStartToken
from ruamel.yaml.tokens import StreamEndToken
from ruamel.yaml.tokens import DirectiveToken
from ruamel.yaml.tokens import DocumentStartToken
from ruamel.yaml.tokens import DocumentEndToken
from ruamel.yaml.tokens import BlockSequenceStartToken
from ruamel.yaml.tokens import BlockMappingStartToken
from ruamel.yaml.tokens import BlockEndToken
from ruamel.yaml.tokens import FlowSequenceStartToken
from ruamel.yaml.tokens import FlowMappingStartToken
from ruamel.yaml.tokens import FlowSequenceEndToken
from ruamel.yaml.tokens import FlowMappingEndToken
from ruamel.yaml.tokens import KeyToken
from ruamel.yaml.tokens import ValueToken
from ruamel.yaml.tokens import BlockEntryToken
from ruamel.yaml.tokens import FlowEntryToken
from ruamel.yaml.tokens import AliasToken
from ruamel.yaml.tokens import AnchorToken
from ruamel.yaml.tokens import TagToken
from ruamel.yaml.tokens import ScalarToken

from ruamel.yaml.events import StreamStartEvent
from ruamel.yaml.events import StreamEndEvent
from ruamel.yaml.events import DocumentStartEvent
from ruamel.yaml.events import DocumentEndEvent
from ruamel.yaml.events import AliasEvent
from ruamel.yaml.events import ScalarEvent
from ruamel.yaml.events import SequenceStartEvent
from ruamel.yaml.events import SequenceEndEvent
from ruamel.yaml.events import MappingStartEvent
from ruamel.yaml.events import MappingEndEvent

from ruamel.yaml.nodes import ScalarNode
from ruamel.yaml.nodes import SequenceNode
from ruamel.yaml.nodes import MappingNode

cdef class Mark:
    cdef readonly object name
    cdef readonly size_t index
    cdef readonly size_t line
    cdef readonly size_t column
    cdef readonly buffer
    cdef readonly pointer

    def __init__(self, object name, size_t index, size_t line, size_t column,
            object buffer, object pointer):
        self.name = name
        self.index = index
        self.line = line
        self.column = column
        self.buffer = buffer
        self.pointer = pointer

    def get_snippet(self):
        return None

    def __str__(self):
        where = "  in \"%s\", line %d, column %d"   \
                % (self.name, self.line+1, self.column+1)
        return where

#class YAMLError(Exception):
#    pass
#
#class MarkedYAMLError(YAMLError):
#
#    def __init__(self, context=None, context_mark=None,
#            problem=None, problem_mark=None, note=None):
#        self.context = context
#        self.context_mark = context_mark
#        self.problem = problem
#        self.problem_mark = problem_mark
#        self.note = note
#
#    def __str__(self):
#        lines = []
#        if self.context is not None:
#            lines.append(self.context)
#        if self.context_mark is not None  \
#            and (self.problem is None or self.problem_mark is None
#                    or self.context_mark.name != self.problem_mark.name
#                    or self.context_mark.line != self.problem_mark.line
#                    or self.context_mark.column != self.problem_mark.column):
#            lines.append(str(self.context_mark))
#        if self.problem is not None:
#            lines.append(self.problem)
#        if self.problem_mark is not None:
#            lines.append(str(self.problem_mark))
#        if self.note is not None:
#            lines.append(self.note)
#        return '\n'.join(lines)
#
#class ReaderError(YAMLError):
#
#    def __init__(self, name, position, character, encoding, reason):
#        self.name = name
#        self.character = character
#        self.position = position
#        self.encoding = encoding
#        self.reason = reason
#
#    def __str__(self):
#        if isinstance(self.character, str):
#            return "'%s' codec can't decode byte #x%02x: %s\n"  \
#                    "  in \"%s\", position %d"    \
#                    % (self.encoding, ord(self.character), self.reason,
#                            self.name, self.position)
#        else:
#            return "unacceptable character #x%04x: %s\n"    \
#                    "  in \"%s\", position %d"    \
#                    % (ord(self.character), self.reason,
#                            self.name, self.position)
#
#class ScannerError(MarkedYAMLError):
#    pass
#
#class ParserError(MarkedYAMLError):
#    pass
#
#class EmitterError(YAMLError):
#    pass
#
#cdef class Token:
#    cdef readonly Mark start_mark
#    cdef readonly Mark end_mark
#    def __init__(self, Mark start_mark, Mark end_mark):
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class StreamStartToken(Token):
#    cdef readonly object encoding
#    def __init__(self, Mark start_mark, Mark end_mark, encoding):
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#        self.encoding = encoding
#
#cdef class StreamEndToken(Token):
#    pass
#
#cdef class DirectiveToken(Token):
#    cdef readonly object name
#    cdef readonly object value
#    def __init__(self, name, value, Mark start_mark, Mark end_mark):
#        self.name = name
#        self.value = value
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class DocumentStartToken(Token):
#    pass
#
#cdef class DocumentEndToken(Token):
#    pass
#
#cdef class BlockSequenceStartToken(Token):
#    pass
#
#cdef class BlockMappingStartToken(Token):
#    pass
#
#cdef class BlockEndToken(Token):
#    pass
#
#cdef class FlowSequenceStartToken(Token):
#    pass
#
#cdef class FlowMappingStartToken(Token):
#    pass
#
#cdef class FlowSequenceEndToken(Token):
#    pass
#
#cdef class FlowMappingEndToken(Token):
#    pass
#
#cdef class KeyToken(Token):
#    pass
#
#cdef class ValueToken(Token):
#    pass
#
#cdef class BlockEntryToken(Token):
#    pass
#
#cdef class FlowEntryToken(Token):
#    pass
#
#cdef class AliasToken(Token):
#    cdef readonly object value
#    def __init__(self, value, Mark start_mark, Mark end_mark):
#        self.value = value
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class AnchorToken(Token):
#    cdef readonly object value
#    def __init__(self, value, Mark start_mark, Mark end_mark):
#        self.value = value
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class TagToken(Token):
#    cdef readonly object value
#    def __init__(self, value, Mark start_mark, Mark end_mark):
#        self.value = value
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#
#cdef class ScalarToken(Token):
#    cdef readonly object value
#    cdef readonly object plain
#    cdef readonly object style
#    def __init__(self, value, plain, Mark start_mark, Mark end_mark, style=None):
#        self.value = value
#        self.plain = plain
#        self.start_mark = start_mark
#        self.end_mark = end_mark
#        self.style = style

cdef class CParser:

    cdef yaml_parser_t parser
    cdef yaml_event_t parsed_event

    cdef object stream
    cdef object stream_name
    cdef object current_token
    cdef object current_event
    cdef object anchors
    cdef object stream_cache
    cdef int stream_cache_len
    cdef int stream_cache_pos
    cdef int unicode_source

    def __init__(self, stream):
        cdef is_readable
        if yaml_parser_initialize(&self.parser) == 0:
            raise MemoryError
        self.parsed_event.type = YAML_NO_EVENT
        is_readable = 1
        try:
            stream.read
        except AttributeError:
            is_readable = 0
        self.unicode_source = 0
        if is_readable:
            self.stream = stream
            try:
                self.stream_name = stream.name
            except AttributeError:
                if PY_MAJOR_VERSION < 3:
                    self.stream_name = '<file>'
                else:
                    self.stream_name = u'<file>'
            self.stream_cache = None
            self.stream_cache_len = 0
            self.stream_cache_pos = 0
            yaml_parser_set_input(&self.parser, input_handler, <void *>self)
        else:
            if PyUnicode_CheckExact(stream) != 0:
                stream = PyUnicode_AsUTF8String(stream)
                if PY_MAJOR_VERSION < 3:
                    self.stream_name = '<unicode string>'
                else:
                    self.stream_name = u'<unicode string>'
                self.unicode_source = 1
            else:
                if PY_MAJOR_VERSION < 3:
                    self.stream_name = '<byte string>'
                else:
                    self.stream_name = u'<byte string>'
            if PyString_CheckExact(stream) == 0:
                if PY_MAJOR_VERSION < 3:
                    raise TypeError("a string or stream input is required")
                else:
                    raise TypeError(u"a string or stream input is required")
            self.stream = stream
            yaml_parser_set_input_string(&self.parser, PyString_AS_STRING(stream), PyString_GET_SIZE(stream))
        self.current_token = None
        self.current_event = None
        self.anchors = {}

    def __dealloc__(self):
        yaml_parser_delete(&self.parser)
        yaml_event_delete(&self.parsed_event)

    def dispose(self):
        pass

    cdef object _parser_error(self):
        if self.parser.error == YAML_MEMORY_ERROR:
            return MemoryError
        elif self.parser.error == YAML_READER_ERROR:
            if PY_MAJOR_VERSION < 3:
                return ReaderError(self.stream_name, self.parser.problem_offset,
                        self.parser.problem_value, '?', self.parser.problem)
            else:
                return ReaderError(self.stream_name, self.parser.problem_offset,
                        self.parser.problem_value, u'?', PyUnicode_FromString(self.parser.problem))
        elif self.parser.error == YAML_SCANNER_ERROR    \
                or self.parser.error == YAML_PARSER_ERROR:
            context_mark = None
            problem_mark = None
            if self.parser.context != NULL:
                context_mark = Mark(self.stream_name,
                        self.parser.context_mark.index,
                        self.parser.context_mark.line,
                        self.parser.context_mark.column, None, None)
            if self.parser.problem != NULL:
                problem_mark = Mark(self.stream_name,
                        self.parser.problem_mark.index,
                        self.parser.problem_mark.line,
                        self.parser.problem_mark.column, None, None)
            context = None
            if self.parser.context != NULL:
                if PY_MAJOR_VERSION < 3:
                    context = self.parser.context
                else:
                    context = PyUnicode_FromString(self.parser.context)
            if PY_MAJOR_VERSION < 3:
                problem = self.parser.problem
            else:
                problem = PyUnicode_FromString(self.parser.problem)
            if self.parser.error == YAML_SCANNER_ERROR:
                return ScannerError(context, context_mark, problem, problem_mark)
            else:
                return ParserError(context, context_mark, problem, problem_mark)
        if PY_MAJOR_VERSION < 3:
            raise ValueError("no parser error")
        else:
            raise ValueError(u"no parser error")

    def raw_scan(self):
        cdef yaml_token_t token
        cdef int done
        cdef int count
        count = 0
        done = 0
        while done == 0:
            if yaml_parser_scan(&self.parser, &token) == 0:
                error = self._parser_error()
                raise error
            if token.type == YAML_NO_TOKEN:
                done = 1
            else:
                count = count+1
            yaml_token_delete(&token)
        return count

    cdef object _scan(self):
        cdef yaml_token_t token
        if yaml_parser_scan(&self.parser, &token) == 0:
            error = self._parser_error()
            raise error
        token_object = self._token_to_object(&token)
        yaml_token_delete(&token)
        return token_object

    cdef object _token_to_object(self, yaml_token_t *token):
        start_mark = Mark(self.stream_name,
                token.start_mark.index,
                token.start_mark.line,
                token.start_mark.column,
                None, None)
        end_mark = Mark(self.stream_name,
                token.end_mark.index,
                token.end_mark.line,
                token.end_mark.column,
                None, None)
        if token.type == YAML_NO_TOKEN:
            return None
        elif token.type == YAML_STREAM_START_TOKEN:
            encoding = None
            if token.data.stream_start.encoding == YAML_UTF8_ENCODING:
                if self.unicode_source == 0:
                    encoding = u"utf-8"
            elif token.data.stream_start.encoding == YAML_UTF16LE_ENCODING:
                encoding = u"utf-16-le"
            elif token.data.stream_start.encoding == YAML_UTF16BE_ENCODING:
                encoding = u"utf-16-be"
            return StreamStartToken(start_mark, end_mark, encoding)
        elif token.type == YAML_STREAM_END_TOKEN:
            return StreamEndToken(start_mark, end_mark)
        elif token.type == YAML_VERSION_DIRECTIVE_TOKEN:
            return DirectiveToken(u"YAML",
                    (token.data.version_directive.major,
                        token.data.version_directive.minor),
                    start_mark, end_mark)
        elif token.type == YAML_TAG_DIRECTIVE_TOKEN:
            handle = PyUnicode_FromString(token.data.tag_directive.handle)
            prefix = PyUnicode_FromString(token.data.tag_directive.prefix)
            return DirectiveToken(u"TAG", (handle, prefix),
                    start_mark, end_mark)
        elif token.type == YAML_DOCUMENT_START_TOKEN:
            return DocumentStartToken(start_mark, end_mark)
        elif token.type == YAML_DOCUMENT_END_TOKEN:
            return DocumentEndToken(start_mark, end_mark)
        elif token.type == YAML_BLOCK_SEQUENCE_START_TOKEN:
            return BlockSequenceStartToken(start_mark, end_mark)
        elif token.type == YAML_BLOCK_MAPPING_START_TOKEN:
            return BlockMappingStartToken(start_mark, end_mark)
        elif token.type == YAML_BLOCK_END_TOKEN:
            return BlockEndToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_SEQUENCE_START_TOKEN:
            return FlowSequenceStartToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_SEQUENCE_END_TOKEN:
            return FlowSequenceEndToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_MAPPING_START_TOKEN:
            return FlowMappingStartToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_MAPPING_END_TOKEN:
            return FlowMappingEndToken(start_mark, end_mark)
        elif token.type == YAML_BLOCK_ENTRY_TOKEN:
            return BlockEntryToken(start_mark, end_mark)
        elif token.type == YAML_FLOW_ENTRY_TOKEN:
            return FlowEntryToken(start_mark, end_mark)
        elif token.type == YAML_KEY_TOKEN:
            return KeyToken(start_mark, end_mark)
        elif token.type == YAML_VALUE_TOKEN:
            return ValueToken(start_mark, end_mark)
        elif token.type == YAML_ALIAS_TOKEN:
            value = PyUnicode_FromString(token.data.alias.value)
            return AliasToken(value, start_mark, end_mark)
        elif token.type == YAML_ANCHOR_TOKEN:
            value = PyUnicode_FromString(token.data.anchor.value)
            return AnchorToken(value, start_mark, end_mark)
        elif token.type == YAML_TAG_TOKEN:
            handle = PyUnicode_FromString(token.data.tag.handle)
            suffix = PyUnicode_FromString(token.data.tag.suffix)
            if not handle:
                handle = None
            return TagToken((handle, suffix), start_mark, end_mark)
        elif token.type == YAML_SCALAR_TOKEN:
            value = PyUnicode_DecodeUTF8(token.data.scalar.value,
                    token.data.scalar.length, 'strict')
            plain = False
            style = None
            if token.data.scalar.style == YAML_PLAIN_SCALAR_STYLE:
                plain = True
                style = u''
            elif token.data.scalar.style == YAML_SINGLE_QUOTED_SCALAR_STYLE:
                style = u'\''
            elif token.data.scalar.style == YAML_DOUBLE_QUOTED_SCALAR_STYLE:
                style = u'"'
            elif token.data.scalar.style == YAML_LITERAL_SCALAR_STYLE:
                style = u'|'
            elif token.data.scalar.style == YAML_FOLDED_SCALAR_STYLE:
                style = u'>'
            return ScalarToken(value, plain,
                    start_mark, end_mark, style)
        else:
            if PY_MAJOR_VERSION < 3:
                raise ValueError("unknown token type")
            else:
                raise ValueError(u"unknown token type")

    def get_token(self):
        if self.current_token is not None:
            value = self.current_token
            self.current_token = None
        else:
            value = self._scan()
        return value

    def peek_token(self):
        if self.current_token is None:
            self.current_token = self._scan()
        return self.current_token

    def check_token(self, *choices):
        if self.current_token is None:
            self.current_token = self._scan()
        if self.current_token is None:
            return False
        if not choices:
            return True
        token_class = self.current_token.__class__
        for choice in choices:
            if token_class is choice:
                return True
        return False

    def raw_parse(self):
        cdef yaml_event_t event
        cdef int done
        cdef int count
        count = 0
        done = 0
        while done == 0:
            if yaml_parser_parse(&self.parser, &event) == 0:
                error = self._parser_error()
                raise error
            if event.type == YAML_NO_EVENT:
                done = 1
            else:
                count = count+1
            yaml_event_delete(&event)
        return count

    cdef object _parse(self):
        cdef yaml_event_t event
        if yaml_parser_parse(&self.parser, &event) == 0:
            error = self._parser_error()
            raise error
        event_object = self._event_to_object(&event)
        yaml_event_delete(&event)
        return event_object

    cdef object _event_to_object(self, yaml_event_t *event):
        cdef yaml_tag_directive_t *tag_directive
        start_mark = Mark(self.stream_name,
                event.start_mark.index,
                event.start_mark.line,
                event.start_mark.column,
                None, None)
        end_mark = Mark(self.stream_name,
                event.end_mark.index,
                event.end_mark.line,
                event.end_mark.column,
                None, None)
        if event.type == YAML_NO_EVENT:
            return None
        elif event.type == YAML_STREAM_START_EVENT:
            encoding = None
            if event.data.stream_start.encoding == YAML_UTF8_ENCODING:
                if self.unicode_source == 0:
                    encoding = u"utf-8"
            elif event.data.stream_start.encoding == YAML_UTF16LE_ENCODING:
                encoding = u"utf-16-le"
            elif event.data.stream_start.encoding == YAML_UTF16BE_ENCODING:
                encoding = u"utf-16-be"
            return StreamStartEvent(start_mark, end_mark, encoding)
        elif event.type == YAML_STREAM_END_EVENT:
            return StreamEndEvent(start_mark, end_mark)
        elif event.type == YAML_DOCUMENT_START_EVENT:
            explicit = False
            if event.data.document_start.implicit == 0:
                explicit = True
            version = None
            if event.data.document_start.version_directive != NULL:
                version = (event.data.document_start.version_directive.major,
                        event.data.document_start.version_directive.minor)
            tags = None
            if event.data.document_start.tag_directives.start != NULL:
                tags = {}
                tag_directive = event.data.document_start.tag_directives.start
                while tag_directive != event.data.document_start.tag_directives.end:
                    handle = PyUnicode_FromString(tag_directive.handle)
                    prefix = PyUnicode_FromString(tag_directive.prefix)
                    tags[handle] = prefix
                    tag_directive = tag_directive+1
            return DocumentStartEvent(start_mark, end_mark,
                    explicit, version, tags)
        elif event.type == YAML_DOCUMENT_END_EVENT:
            explicit = False
            if event.data.document_end.implicit == 0:
                explicit = True
            return DocumentEndEvent(start_mark, end_mark, explicit)
        elif event.type == YAML_ALIAS_EVENT:
            anchor = PyUnicode_FromString(event.data.alias.anchor)
            return AliasEvent(anchor, start_mark, end_mark)
        elif event.type == YAML_SCALAR_EVENT:
            anchor = None
            if event.data.scalar.anchor != NULL:
                anchor = PyUnicode_FromString(event.data.scalar.anchor)
            tag = None
            if event.data.scalar.tag != NULL:
                tag = PyUnicode_FromString(event.data.scalar.tag)
            value = PyUnicode_DecodeUTF8(event.data.scalar.value,
                    event.data.scalar.length, 'strict')
            plain_implicit = False
            if event.data.scalar.plain_implicit == 1:
                plain_implicit = True
            quoted_implicit = False
            if event.data.scalar.quoted_implicit == 1:
                quoted_implicit = True
            style = None
            if event.data.scalar.style == YAML_PLAIN_SCALAR_STYLE:
                style = u''
            elif event.data.scalar.style == YAML_SINGLE_QUOTED_SCALAR_STYLE:
                style = u'\''
            elif event.data.scalar.style == YAML_DOUBLE_QUOTED_SCALAR_STYLE:
                style = u'"'
            elif event.data.scalar.style == YAML_LITERAL_SCALAR_STYLE:
                style = u'|'
            elif event.data.scalar.style == YAML_FOLDED_SCALAR_STYLE:
                style = u'>'
            return ScalarEvent(anchor, tag,
                    (plain_implicit, quoted_implicit),
                    value, start_mark, end_mark, style)
        elif event.type == YAML_SEQUENCE_START_EVENT:
            anchor = None
            if event.data.sequence_start.anchor != NULL:
                anchor = PyUnicode_FromString(event.data.sequence_start.anchor)
            tag = None
            if event.data.sequence_start.tag != NULL:
                tag = PyUnicode_FromString(event.data.sequence_start.tag)
            implicit = False
            if event.data.sequence_start.implicit == 1:
                implicit = True
            flow_style = None
            if event.data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE:
                flow_style = True
            elif event.data.sequence_start.style == YAML_BLOCK_SEQUENCE_STYLE:
                flow_style = False
            return SequenceStartEvent(anchor, tag, implicit,
                    start_mark, end_mark, flow_style)
        elif event.type == YAML_MAPPING_START_EVENT:
            anchor = None
            if event.data.mapping_start.anchor != NULL:
                anchor = PyUnicode_FromString(event.data.mapping_start.anchor)
            tag = None
            if event.data.mapping_start.tag != NULL:
                tag = PyUnicode_FromString(event.data.mapping_start.tag)
            implicit = False
            if event.data.mapping_start.implicit == 1:
                implicit = True
            flow_style = None
            if event.data.mapping_start.style == YAML_FLOW_MAPPING_STYLE:
                flow_style = True
            elif event.data.mapping_start.style == YAML_BLOCK_MAPPING_STYLE:
                flow_style = False
            return MappingStartEvent(anchor, tag, implicit,
                    start_mark, end_mark, flow_style)
        elif event.type == YAML_SEQUENCE_END_EVENT:
            return SequenceEndEvent(start_mark, end_mark)
        elif event.type == YAML_MAPPING_END_EVENT:
            return MappingEndEvent(start_mark, end_mark)
        else:
            if PY_MAJOR_VERSION < 3:
                raise ValueError("unknown event type")
            else:
                raise ValueError(u"unknown event type")

    def get_event(self):
        if self.current_event is not None:
            value = self.current_event
            self.current_event = None
        else:
            value = self._parse()
        return value

    def peek_event(self):
        if self.current_event is None:
            self.current_event = self._parse()
        return self.current_event

    def check_event(self, *choices):
        if self.current_event is None:
            self.current_event = self._parse()
        if self.current_event is None:
            return False
        if not choices:
            return True
        event_class = self.current_event.__class__
        for choice in choices:
            if event_class is choice:
                return True
        return False

    def check_node(self):
        self._parse_next_event()
        if self.parsed_event.type == YAML_STREAM_START_EVENT:
            yaml_event_delete(&self.parsed_event)
            self._parse_next_event()
        if self.parsed_event.type != YAML_STREAM_END_EVENT:
            return True
        return False

    def get_node(self):
        self._parse_next_event()
        if self.parsed_event.type != YAML_STREAM_END_EVENT:
            return self._compose_document()

    def get_single_node(self):
        self._parse_next_event()
        yaml_event_delete(&self.parsed_event)
        self._parse_next_event()
        document = None
        if self.parsed_event.type != YAML_STREAM_END_EVENT:
            document = self._compose_document()
        self._parse_next_event()
        if self.parsed_event.type != YAML_STREAM_END_EVENT:
            mark = Mark(self.stream_name,
                    self.parsed_event.start_mark.index,
                    self.parsed_event.start_mark.line,
                    self.parsed_event.start_mark.column,
                    None, None)
            if PY_MAJOR_VERSION < 3:
                raise ComposerError("expected a single document in the stream",
                        document.start_mark, "but found another document", mark)
            else:
                raise ComposerError(u"expected a single document in the stream",
                        document.start_mark, u"but found another document", mark)
        return document

    cdef object _compose_document(self):
        yaml_event_delete(&self.parsed_event)
        node = self._compose_node(None, None)
        self._parse_next_event()
        yaml_event_delete(&self.parsed_event)
        self.anchors = {}
        return node

    cdef object _compose_node(self, object parent, object index):
        self._parse_next_event()
        if self.parsed_event.type == YAML_ALIAS_EVENT:
            anchor = PyUnicode_FromString(self.parsed_event.data.alias.anchor)
            if anchor not in self.anchors:
                mark = Mark(self.stream_name,
                        self.parsed_event.start_mark.index,
                        self.parsed_event.start_mark.line,
                        self.parsed_event.start_mark.column,
                        None, None)
                if PY_MAJOR_VERSION < 3:
                    raise ComposerError(None, None, "found undefined alias", mark)
                else:
                    raise ComposerError(None, None, u"found undefined alias", mark)
            yaml_event_delete(&self.parsed_event)
            return self.anchors[anchor]
        anchor = None
        if self.parsed_event.type == YAML_SCALAR_EVENT  \
                and self.parsed_event.data.scalar.anchor != NULL:
            anchor = PyUnicode_FromString(self.parsed_event.data.scalar.anchor)
        elif self.parsed_event.type == YAML_SEQUENCE_START_EVENT    \
                and self.parsed_event.data.sequence_start.anchor != NULL:
            anchor = PyUnicode_FromString(self.parsed_event.data.sequence_start.anchor)
        elif self.parsed_event.type == YAML_MAPPING_START_EVENT    \
                and self.parsed_event.data.mapping_start.anchor != NULL:
            anchor = PyUnicode_FromString(self.parsed_event.data.mapping_start.anchor)
        if anchor is not None:
            if anchor in self.anchors:
                mark = Mark(self.stream_name,
                        self.parsed_event.start_mark.index,
                        self.parsed_event.start_mark.line,
                        self.parsed_event.start_mark.column,
                        None, None)
                if PY_MAJOR_VERSION < 3:
                    raise ComposerError("found duplicate anchor; first occurrence",
                            self.anchors[anchor].start_mark, "second occurrence", mark)
                else:
                    raise ComposerError(u"found duplicate anchor; first occurrence",
                            self.anchors[anchor].start_mark, u"second occurrence", mark)
        self.descend_resolver(parent, index)
        if self.parsed_event.type == YAML_SCALAR_EVENT:
            node = self._compose_scalar_node(anchor)
        elif self.parsed_event.type == YAML_SEQUENCE_START_EVENT:
            node = self._compose_sequence_node(anchor)
        elif self.parsed_event.type == YAML_MAPPING_START_EVENT:
            node = self._compose_mapping_node(anchor)
        self.ascend_resolver()
        return node

    cdef _compose_scalar_node(self, object anchor):
        start_mark = Mark(self.stream_name,
                self.parsed_event.start_mark.index,
                self.parsed_event.start_mark.line,
                self.parsed_event.start_mark.column,
                None, None)
        end_mark = Mark(self.stream_name,
                self.parsed_event.end_mark.index,
                self.parsed_event.end_mark.line,
                self.parsed_event.end_mark.column,
                None, None)
        value = PyUnicode_DecodeUTF8(self.parsed_event.data.scalar.value,
                self.parsed_event.data.scalar.length, 'strict')
        plain_implicit = False
        if self.parsed_event.data.scalar.plain_implicit == 1:
            plain_implicit = True
        quoted_implicit = False
        if self.parsed_event.data.scalar.quoted_implicit == 1:
            quoted_implicit = True
        if self.parsed_event.data.scalar.tag == NULL    \
                or (self.parsed_event.data.scalar.tag[0] == c'!'
                        and self.parsed_event.data.scalar.tag[1] == c'\0'):
            tag = self.resolve(ScalarNode, value, (plain_implicit, quoted_implicit))
        else:
            tag = PyUnicode_FromString(self.parsed_event.data.scalar.tag)
        style = None
        if self.parsed_event.data.scalar.style == YAML_PLAIN_SCALAR_STYLE:
            style = u''
        elif self.parsed_event.data.scalar.style == YAML_SINGLE_QUOTED_SCALAR_STYLE:
            style = u'\''
        elif self.parsed_event.data.scalar.style == YAML_DOUBLE_QUOTED_SCALAR_STYLE:
            style = u'"'
        elif self.parsed_event.data.scalar.style == YAML_LITERAL_SCALAR_STYLE:
            style = u'|'
        elif self.parsed_event.data.scalar.style == YAML_FOLDED_SCALAR_STYLE:
            style = u'>'
        node = ScalarNode(tag, value, start_mark, end_mark, style)
        if anchor is not None:
            self.anchors[anchor] = node
        yaml_event_delete(&self.parsed_event)
        return node

    cdef _compose_sequence_node(self, object anchor):
        cdef int index
        start_mark = Mark(self.stream_name,
                self.parsed_event.start_mark.index,
                self.parsed_event.start_mark.line,
                self.parsed_event.start_mark.column,
                None, None)
        implicit = False
        if self.parsed_event.data.sequence_start.implicit == 1:
            implicit = True
        if self.parsed_event.data.sequence_start.tag == NULL    \
                or (self.parsed_event.data.sequence_start.tag[0] == c'!'
                        and self.parsed_event.data.sequence_start.tag[1] == c'\0'):
            tag = self.resolve(SequenceNode, None, implicit)
        else:
            tag = PyUnicode_FromString(self.parsed_event.data.sequence_start.tag)
        flow_style = None
        if self.parsed_event.data.sequence_start.style == YAML_FLOW_SEQUENCE_STYLE:
            flow_style = True
        elif self.parsed_event.data.sequence_start.style == YAML_BLOCK_SEQUENCE_STYLE:
            flow_style = False
        value = []
        node = SequenceNode(tag, value, start_mark, None, flow_style)
        if anchor is not None:
            self.anchors[anchor] = node
        yaml_event_delete(&self.parsed_event)
        index = 0
        self._parse_next_event()
        while self.parsed_event.type != YAML_SEQUENCE_END_EVENT:
            value.append(self._compose_node(node, index))
            index = index+1
            self._parse_next_event()
        node.end_mark = Mark(self.stream_name,
                self.parsed_event.end_mark.index,
                self.parsed_event.end_mark.line,
                self.parsed_event.end_mark.column,
                None, None)
        yaml_event_delete(&self.parsed_event)
        return node

    cdef _compose_mapping_node(self, object anchor):
        start_mark = Mark(self.stream_name,
                self.parsed_event.start_mark.index,
                self.parsed_event.start_mark.line,
                self.parsed_event.start_mark.column,
                None, None)
        implicit = False
        if self.parsed_event.data.mapping_start.implicit == 1:
            implicit = True
        if self.parsed_event.data.mapping_start.tag == NULL    \
                or (self.parsed_event.data.mapping_start.tag[0] == c'!'
                        and self.parsed_event.data.mapping_start.tag[1] == c'\0'):
            tag = self.resolve(MappingNode, None, implicit)
        else:
            tag = PyUnicode_FromString(self.parsed_event.data.mapping_start.tag)
        flow_style = None
        if self.parsed_event.data.mapping_start.style == YAML_FLOW_MAPPING_STYLE:
            flow_style = True
        elif self.parsed_event.data.mapping_start.style == YAML_BLOCK_MAPPING_STYLE:
            flow_style = False
        value = []
        node = MappingNode(tag, value, start_mark, None, flow_style)
        if anchor is not None:
            self.anchors[anchor] = node
        yaml_event_delete(&self.parsed_event)
        self._parse_next_event()
        while self.parsed_event.type != YAML_MAPPING_END_EVENT:
            item_key = self._compose_node(node, None)
            item_value = self._compose_node(node, item_key)
            value.append((item_key, item_value))
            self._parse_next_event()
        node.end_mark = Mark(self.stream_name,
                self.parsed_event.end_mark.index,
                self.parsed_event.end_mark.line,
                self.parsed_event.end_mark.column,
                None, None)
        yaml_event_delete(&self.parsed_event)
        return node

    cdef int _parse_next_event(self) except 0:
        if self.parsed_event.type == YAML_NO_EVENT:
            if yaml_parser_parse(&self.parser, &self.parsed_event) == 0:
                error = self._parser_error()
                raise error
        return 1

cdef int input_handler(void *data, char *buffer, int size, int *read) except 0:
    cdef CParser parser
    parser = <CParser>data
    if parser.stream_cache is None:
        value = parser.stream.read(size)
        if PyUnicode_CheckExact(value) != 0:
            value = PyUnicode_AsUTF8String(value)
            parser.unicode_source = 1
        if PyString_CheckExact(value) == 0:
            if PY_MAJOR_VERSION < 3:
                raise TypeError("a string value is expected")
            else:
                raise TypeError(u"a string value is expected")
        parser.stream_cache = value
        parser.stream_cache_pos = 0
        parser.stream_cache_len = PyString_GET_SIZE(value)
    if (parser.stream_cache_len - parser.stream_cache_pos) < size:
        size = parser.stream_cache_len - parser.stream_cache_pos
    if size > 0:
        memcpy(buffer, PyString_AS_STRING(parser.stream_cache)
                            + parser.stream_cache_pos, size)
    read[0] = size
    parser.stream_cache_pos += size
    if parser.stream_cache_pos == parser.stream_cache_len:
        parser.stream_cache = None
    return 1

cdef class CEmitter:

    cdef yaml_emitter_t emitter

    cdef object stream

    cdef int document_start_implicit
    cdef int document_end_implicit
    cdef object use_version
    cdef object use_tags

    cdef object serialized_nodes
    cdef object anchors
    cdef int last_alias_id
    cdef int closed
    cdef int dump_unicode
    cdef object use_encoding

    def __init__(self, stream, canonical=None, indent=None, width=None,
            allow_unicode=None, line_break=None, encoding=None,
            explicit_start=None, explicit_end=None, version=None, tags=None):
        if yaml_emitter_initialize(&self.emitter) == 0:
            raise MemoryError
        self.stream = stream
        self.dump_unicode = 0
        if PY_MAJOR_VERSION < 3:
            if getattr3(stream, 'encoding', None):
                self.dump_unicode = 1
        else:
            if hasattr(stream, u'encoding'):
                self.dump_unicode = 1
        self.use_encoding = encoding
        yaml_emitter_set_output(&self.emitter, output_handler, <void *>self)
        if canonical:
            yaml_emitter_set_canonical(&self.emitter, 1)
        if indent is not None:
            yaml_emitter_set_indent(&self.emitter, indent)
        if width is not None:
            yaml_emitter_set_width(&self.emitter, width)
        if allow_unicode:
            yaml_emitter_set_unicode(&self.emitter, 1)
        if line_break is not None:
            if line_break == '\r':
                yaml_emitter_set_break(&self.emitter, YAML_CR_BREAK)
            elif line_break == '\n':
                yaml_emitter_set_break(&self.emitter, YAML_LN_BREAK)
            elif line_break == '\r\n':
                yaml_emitter_set_break(&self.emitter, YAML_CRLN_BREAK)
        self.document_start_implicit = 1
        if explicit_start:
            self.document_start_implicit = 0
        self.document_end_implicit = 1
        if explicit_end:
            self.document_end_implicit = 0
        self.use_version = version
        self.use_tags = tags
        self.serialized_nodes = {}
        self.anchors = {}
        self.last_alias_id = 0
        self.closed = -1

    def __dealloc__(self):
        yaml_emitter_delete(&self.emitter)

    def dispose(self):
        pass

    cdef object _emitter_error(self):
        if self.emitter.error == YAML_MEMORY_ERROR:
            return MemoryError
        elif self.emitter.error == YAML_EMITTER_ERROR:
            if PY_MAJOR_VERSION < 3:
                problem = self.emitter.problem
            else:
                problem = PyUnicode_FromString(self.emitter.problem)
            return EmitterError(problem)
        if PY_MAJOR_VERSION < 3:
            raise ValueError("no emitter error")
        else:
            raise ValueError(u"no emitter error")

    cdef int _object_to_event(self, object event_object, yaml_event_t *event) except 0:
        cdef yaml_encoding_t encoding
        cdef yaml_version_directive_t version_directive_value
        cdef yaml_version_directive_t *version_directive
        cdef yaml_tag_directive_t tag_directives_value[128]
        cdef yaml_tag_directive_t *tag_directives_start
        cdef yaml_tag_directive_t *tag_directives_end
        cdef int implicit
        cdef int plain_implicit
        cdef int quoted_implicit
        cdef char *anchor
        cdef char *tag
        cdef char *value
        cdef int length
        cdef yaml_scalar_style_t scalar_style
        cdef yaml_sequence_style_t sequence_style
        cdef yaml_mapping_style_t mapping_style
        event_class = event_object.__class__
        if event_class is StreamStartEvent:
            encoding = YAML_UTF8_ENCODING
            if event_object.encoding == u'utf-16-le' or event_object.encoding == 'utf-16-le':
                encoding = YAML_UTF16LE_ENCODING
            elif event_object.encoding == u'utf-16-be' or event_object.encoding == 'utf-16-be':
                encoding = YAML_UTF16BE_ENCODING
            if event_object.encoding is None:
                self.dump_unicode = 1
            if self.dump_unicode == 1:
                encoding = YAML_UTF8_ENCODING
            yaml_stream_start_event_initialize(event, encoding)
        elif event_class is StreamEndEvent:
            yaml_stream_end_event_initialize(event)
        elif event_class is DocumentStartEvent:
            version_directive = NULL
            if event_object.version:
                version_directive_value.major = event_object.version[0]
                version_directive_value.minor = event_object.version[1]
                version_directive = &version_directive_value
            tag_directives_start = NULL
            tag_directives_end = NULL
            if event_object.tags:
                if len(event_object.tags) > 128:
                    if PY_MAJOR_VERSION < 3:
                        raise ValueError("too many tags")
                    else:
                        raise ValueError(u"too many tags")
                tag_directives_start = tag_directives_value
                tag_directives_end = tag_directives_value
                cache = []
                for handle in event_object.tags:
                    prefix = event_object.tags[handle]
                    if PyUnicode_CheckExact(handle):
                        handle = PyUnicode_AsUTF8String(handle)
                        cache.append(handle)
                    if not PyString_CheckExact(handle):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag handle must be a string")
                        else:
                            raise TypeError(u"tag handle must be a string")
                    tag_directives_end.handle = PyString_AS_STRING(handle)
                    if PyUnicode_CheckExact(prefix):
                        prefix = PyUnicode_AsUTF8String(prefix)
                        cache.append(prefix)
                    if not PyString_CheckExact(prefix):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag prefix must be a string")
                        else:
                            raise TypeError(u"tag prefix must be a string")
                    tag_directives_end.prefix = PyString_AS_STRING(prefix)
                    tag_directives_end = tag_directives_end+1
            implicit = 1
            if event_object.explicit:
                implicit = 0
            if yaml_document_start_event_initialize(event, version_directive,
                    tag_directives_start, tag_directives_end, implicit) == 0:
                raise MemoryError
        elif event_class is DocumentEndEvent:
            implicit = 1
            if event_object.explicit:
                implicit = 0
            yaml_document_end_event_initialize(event, implicit)
        elif event_class is AliasEvent:
            anchor = NULL
            anchor_object = event_object.anchor
            if PyUnicode_CheckExact(anchor_object):
                anchor_object = PyUnicode_AsUTF8String(anchor_object)
            if not PyString_CheckExact(anchor_object):
                if PY_MAJOR_VERSION < 3:
                    raise TypeError("anchor must be a string")
                else:
                    raise TypeError(u"anchor must be a string")
            anchor = PyString_AS_STRING(anchor_object)
            if yaml_alias_event_initialize(event, anchor) == 0:
                raise MemoryError
        elif event_class is ScalarEvent:
            anchor = NULL
            anchor_object = event_object.anchor
            if anchor_object is not None:
                if PyUnicode_CheckExact(anchor_object):
                    anchor_object = PyUnicode_AsUTF8String(anchor_object)
                if not PyString_CheckExact(anchor_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("anchor must be a string")
                    else:
                        raise TypeError(u"anchor must be a string")
                anchor = PyString_AS_STRING(anchor_object)
            tag = NULL
            tag_object = event_object.tag
            if tag_object is not None:
                if PyUnicode_CheckExact(tag_object):
                    tag_object = PyUnicode_AsUTF8String(tag_object)
                if not PyString_CheckExact(tag_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag must be a string")
                    else:
                        raise TypeError(u"tag must be a string")
                tag = PyString_AS_STRING(tag_object)
            value_object = event_object.value
            if PyUnicode_CheckExact(value_object):
                value_object = PyUnicode_AsUTF8String(value_object)
            if not PyString_CheckExact(value_object):
                if PY_MAJOR_VERSION < 3:
                    raise TypeError("value must be a string")
                else:
                    raise TypeError(u"value must be a string")
            value = PyString_AS_STRING(value_object)
            length = PyString_GET_SIZE(value_object)
            plain_implicit = 0
            quoted_implicit = 0
            if event_object.implicit is not None:
                plain_implicit = event_object.implicit[0]
                quoted_implicit = event_object.implicit[1]
            style_object = event_object.style
            scalar_style = YAML_PLAIN_SCALAR_STYLE
            if style_object == "'" or style_object == u"'":
                scalar_style = YAML_SINGLE_QUOTED_SCALAR_STYLE
            elif style_object == "\"" or style_object == u"\"":
                scalar_style = YAML_DOUBLE_QUOTED_SCALAR_STYLE
            elif style_object == "|" or style_object == u"|":
                scalar_style = YAML_LITERAL_SCALAR_STYLE
            elif style_object == ">" or style_object == u">":
                scalar_style = YAML_FOLDED_SCALAR_STYLE
            if yaml_scalar_event_initialize(event, anchor, tag, value, length,
                    plain_implicit, quoted_implicit, scalar_style) == 0:
                raise MemoryError
        elif event_class is SequenceStartEvent:
            anchor = NULL
            anchor_object = event_object.anchor
            if anchor_object is not None:
                if PyUnicode_CheckExact(anchor_object):
                    anchor_object = PyUnicode_AsUTF8String(anchor_object)
                if not PyString_CheckExact(anchor_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("anchor must be a string")
                    else:
                        raise TypeError(u"anchor must be a string")
                anchor = PyString_AS_STRING(anchor_object)
            tag = NULL
            tag_object = event_object.tag
            if tag_object is not None:
                if PyUnicode_CheckExact(tag_object):
                    tag_object = PyUnicode_AsUTF8String(tag_object)
                if not PyString_CheckExact(tag_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag must be a string")
                    else:
                        raise TypeError(u"tag must be a string")
                tag = PyString_AS_STRING(tag_object)
            implicit = 0
            if event_object.implicit:
                implicit = 1
            sequence_style = YAML_BLOCK_SEQUENCE_STYLE
            if event_object.flow_style:
                sequence_style = YAML_FLOW_SEQUENCE_STYLE
            if yaml_sequence_start_event_initialize(event, anchor, tag,
                    implicit, sequence_style) == 0:
                raise MemoryError
        elif event_class is MappingStartEvent:
            anchor = NULL
            anchor_object = event_object.anchor
            if anchor_object is not None:
                if PyUnicode_CheckExact(anchor_object):
                    anchor_object = PyUnicode_AsUTF8String(anchor_object)
                if not PyString_CheckExact(anchor_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("anchor must be a string")
                    else:
                        raise TypeError(u"anchor must be a string")
                anchor = PyString_AS_STRING(anchor_object)
            tag = NULL
            tag_object = event_object.tag
            if tag_object is not None:
                if PyUnicode_CheckExact(tag_object):
                    tag_object = PyUnicode_AsUTF8String(tag_object)
                if not PyString_CheckExact(tag_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag must be a string")
                    else:
                        raise TypeError(u"tag must be a string")
                tag = PyString_AS_STRING(tag_object)
            implicit = 0
            if event_object.implicit:
                implicit = 1
            mapping_style = YAML_BLOCK_MAPPING_STYLE
            if event_object.flow_style:
                mapping_style = YAML_FLOW_MAPPING_STYLE
            if yaml_mapping_start_event_initialize(event, anchor, tag,
                    implicit, mapping_style) == 0:
                raise MemoryError
        elif event_class is SequenceEndEvent:
            yaml_sequence_end_event_initialize(event)
        elif event_class is MappingEndEvent:
            yaml_mapping_end_event_initialize(event)
        else:
            if PY_MAJOR_VERSION < 3:
                raise TypeError("invalid event %s" % event_object)
            else:
                raise TypeError(u"invalid event %s" % event_object)
        return 1

    def emit(self, event_object):
        cdef yaml_event_t event
        self._object_to_event(event_object, &event)
        if yaml_emitter_emit(&self.emitter, &event) == 0:
            error = self._emitter_error()
            raise error

    def open(self):
        cdef yaml_event_t event
        cdef yaml_encoding_t encoding
        if self.closed == -1:
            if self.use_encoding == u'utf-16-le' or self.use_encoding == 'utf-16-le':
                encoding = YAML_UTF16LE_ENCODING
            elif self.use_encoding == u'utf-16-be' or self.use_encoding == 'utf-16-be':
                encoding = YAML_UTF16BE_ENCODING
            else:
                encoding = YAML_UTF8_ENCODING
            if self.use_encoding is None:
                self.dump_unicode = 1
            if self.dump_unicode == 1:
                encoding = YAML_UTF8_ENCODING
            yaml_stream_start_event_initialize(&event, encoding)
            if yaml_emitter_emit(&self.emitter, &event) == 0:
                error = self._emitter_error()
                raise error
            self.closed = 0
        elif self.closed == 1:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is closed")
            else:
                raise SerializerError(u"serializer is closed")
        else:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is already opened")
            else:
                raise SerializerError(u"serializer is already opened")

    def close(self):
        cdef yaml_event_t event
        if self.closed == -1:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is not opened")
            else:
                raise SerializerError(u"serializer is not opened")
        elif self.closed == 0:
            yaml_stream_end_event_initialize(&event)
            if yaml_emitter_emit(&self.emitter, &event) == 0:
                error = self._emitter_error()
                raise error
            self.closed = 1

    def serialize(self, node):
        cdef yaml_event_t event
        cdef yaml_version_directive_t version_directive_value
        cdef yaml_version_directive_t *version_directive
        cdef yaml_tag_directive_t tag_directives_value[128]
        cdef yaml_tag_directive_t *tag_directives_start
        cdef yaml_tag_directive_t *tag_directives_end
        if self.closed == -1:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is not opened")
            else:
                raise SerializerError(u"serializer is not opened")
        elif self.closed == 1:
            if PY_MAJOR_VERSION < 3:
                raise SerializerError("serializer is closed")
            else:
                raise SerializerError(u"serializer is closed")
        cache = []
        version_directive = NULL
        if self.use_version:
            version_directive_value.major = self.use_version[0]
            version_directive_value.minor = self.use_version[1]
            version_directive = &version_directive_value
        tag_directives_start = NULL
        tag_directives_end = NULL
        if self.use_tags:
            if len(self.use_tags) > 128:
                if PY_MAJOR_VERSION < 3:
                    raise ValueError("too many tags")
                else:
                    raise ValueError(u"too many tags")
            tag_directives_start = tag_directives_value
            tag_directives_end = tag_directives_value
            for handle in self.use_tags:
                prefix = self.use_tags[handle]
                if PyUnicode_CheckExact(handle):
                    handle = PyUnicode_AsUTF8String(handle)
                    cache.append(handle)
                if not PyString_CheckExact(handle):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag handle must be a string")
                    else:
                        raise TypeError(u"tag handle must be a string")
                tag_directives_end.handle = PyString_AS_STRING(handle)
                if PyUnicode_CheckExact(prefix):
                    prefix = PyUnicode_AsUTF8String(prefix)
                    cache.append(prefix)
                if not PyString_CheckExact(prefix):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("tag prefix must be a string")
                    else:
                        raise TypeError(u"tag prefix must be a string")
                tag_directives_end.prefix = PyString_AS_STRING(prefix)
                tag_directives_end = tag_directives_end+1
        if yaml_document_start_event_initialize(&event, version_directive,
                tag_directives_start, tag_directives_end,
                self.document_start_implicit) == 0:
            raise MemoryError
        if yaml_emitter_emit(&self.emitter, &event) == 0:
            error = self._emitter_error()
            raise error
        self._anchor_node(node)
        self._serialize_node(node, None, None)
        yaml_document_end_event_initialize(&event, self.document_end_implicit)
        if yaml_emitter_emit(&self.emitter, &event) == 0:
            error = self._emitter_error()
            raise error
        self.serialized_nodes = {}
        self.anchors = {}
        self.last_alias_id = 0

    cdef int _anchor_node(self, object node) except 0:
        if node in self.anchors:
            if self.anchors[node] is None:
                self.last_alias_id = self.last_alias_id+1
                self.anchors[node] = u"id%03d" % self.last_alias_id
        else:
            self.anchors[node] = None
            node_class = node.__class__
            if node_class is SequenceNode:
                for item in node.value:
                    self._anchor_node(item)
            elif node_class is MappingNode:
                for key, value in node.value:
                    self._anchor_node(key)
                    self._anchor_node(value)
        return 1

    cdef int _serialize_node(self, object node, object parent, object index) except 0:
        cdef yaml_event_t event
        cdef int implicit
        cdef int plain_implicit
        cdef int quoted_implicit
        cdef char *anchor
        cdef char *tag
        cdef char *value
        cdef int length
        cdef int item_index
        cdef yaml_scalar_style_t scalar_style
        cdef yaml_sequence_style_t sequence_style
        cdef yaml_mapping_style_t mapping_style
        anchor_object = self.anchors[node]
        anchor = NULL
        if anchor_object is not None:
            if PyUnicode_CheckExact(anchor_object):
                anchor_object = PyUnicode_AsUTF8String(anchor_object)
            if not PyString_CheckExact(anchor_object):
                if PY_MAJOR_VERSION < 3:
                    raise TypeError("anchor must be a string")
                else:
                    raise TypeError(u"anchor must be a string")
            anchor = PyString_AS_STRING(anchor_object)
        if node in self.serialized_nodes:
            if yaml_alias_event_initialize(&event, anchor) == 0:
                raise MemoryError
            if yaml_emitter_emit(&self.emitter, &event) == 0:
                error = self._emitter_error()
                raise error
        else:
            node_class = node.__class__
            self.serialized_nodes[node] = True
            self.descend_resolver(parent, index)
            if node_class is ScalarNode:
                plain_implicit = 0
                quoted_implicit = 0
                tag_object = node.tag
                if self.resolve(ScalarNode, node.value, (True, False)) == tag_object:
                    plain_implicit = 1
                if self.resolve(ScalarNode, node.value, (False, True)) == tag_object:
                    quoted_implicit = 1
                tag = NULL
                if tag_object is not None:
                    if PyUnicode_CheckExact(tag_object):
                        tag_object = PyUnicode_AsUTF8String(tag_object)
                    if not PyString_CheckExact(tag_object):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag must be a string")
                        else:
                            raise TypeError(u"tag must be a string")
                    tag = PyString_AS_STRING(tag_object)
                value_object = node.value
                if PyUnicode_CheckExact(value_object):
                    value_object = PyUnicode_AsUTF8String(value_object)
                if not PyString_CheckExact(value_object):
                    if PY_MAJOR_VERSION < 3:
                        raise TypeError("value must be a string")
                    else:
                        raise TypeError(u"value must be a string")
                value = PyString_AS_STRING(value_object)
                length = PyString_GET_SIZE(value_object)
                style_object = node.style
                scalar_style = YAML_PLAIN_SCALAR_STYLE
                if style_object == "'" or style_object == u"'":
                    scalar_style = YAML_SINGLE_QUOTED_SCALAR_STYLE
                elif style_object == "\"" or style_object == u"\"":
                    scalar_style = YAML_DOUBLE_QUOTED_SCALAR_STYLE
                elif style_object == "|" or style_object == u"|":
                    scalar_style = YAML_LITERAL_SCALAR_STYLE
                elif style_object == ">" or style_object == u">":
                    scalar_style = YAML_FOLDED_SCALAR_STYLE
                if yaml_scalar_event_initialize(&event, anchor, tag, value, length,
                        plain_implicit, quoted_implicit, scalar_style) == 0:
                    raise MemoryError
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
            elif node_class is SequenceNode:
                implicit = 0
                tag_object = node.tag
                if self.resolve(SequenceNode, node.value, True) == tag_object:
                    implicit = 1
                tag = NULL
                if tag_object is not None:
                    if PyUnicode_CheckExact(tag_object):
                        tag_object = PyUnicode_AsUTF8String(tag_object)
                    if not PyString_CheckExact(tag_object):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag must be a string")
                        else:
                            raise TypeError(u"tag must be a string")
                    tag = PyString_AS_STRING(tag_object)
                sequence_style = YAML_BLOCK_SEQUENCE_STYLE
                if node.flow_style:
                    sequence_style = YAML_FLOW_SEQUENCE_STYLE
                if yaml_sequence_start_event_initialize(&event, anchor, tag,
                        implicit, sequence_style) == 0:
                    raise MemoryError
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
                item_index = 0
                for item in node.value:
                    self._serialize_node(item, node, item_index)
                    item_index = item_index+1
                yaml_sequence_end_event_initialize(&event)
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
            elif node_class is MappingNode:
                implicit = 0
                tag_object = node.tag
                if self.resolve(MappingNode, node.value, True) == tag_object:
                    implicit = 1
                tag = NULL
                if tag_object is not None:
                    if PyUnicode_CheckExact(tag_object):
                        tag_object = PyUnicode_AsUTF8String(tag_object)
                    if not PyString_CheckExact(tag_object):
                        if PY_MAJOR_VERSION < 3:
                            raise TypeError("tag must be a string")
                        else:
                            raise TypeError(u"tag must be a string")
                    tag = PyString_AS_STRING(tag_object)
                mapping_style = YAML_BLOCK_MAPPING_STYLE
                if node.flow_style:
                    mapping_style = YAML_FLOW_MAPPING_STYLE
                if yaml_mapping_start_event_initialize(&event, anchor, tag,
                        implicit, mapping_style) == 0:
                    raise MemoryError
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
                for item_key, item_value in node.value:
                    self._serialize_node(item_key, node, None)
                    self._serialize_node(item_value, node, item_key)
                yaml_mapping_end_event_initialize(&event)
                if yaml_emitter_emit(&self.emitter, &event) == 0:
                    error = self._emitter_error()
                    raise error
            self.ascend_resolver()
        return 1

cdef int output_handler(void *data, char *buffer, int size) except 0:
    cdef CEmitter emitter
    emitter = <CEmitter>data
    if emitter.dump_unicode == 0:
        value = PyString_FromStringAndSize(buffer, size)
    else:
        value = PyUnicode_DecodeUTF8(buffer, size, 'strict')
    emitter.stream.write(value)
    return 1