Add m-esr52 at 52.6.0

1 files changed, 1527 insertions, 0 deletions

diff --git a/python/pyyaml/ext/_yaml.pyx b/python/pyyaml/ext/_yaml.pyx
new file mode 100644
index 000000000..5158fb4d9
--- /dev/null
+++ b/python/pyyaml/ext/_yaml.pyx
@@ -0,0 +1,1527 @@
+
+import yaml
+
+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
+YAMLError = yaml.error.YAMLError
+ReaderError = yaml.reader.ReaderError
+ScannerError = yaml.scanner.ScannerError
+ParserError = yaml.parser.ParserError
+ComposerError = yaml.composer.ComposerError
+ConstructorError = yaml.constructor.ConstructorError
+EmitterError = yaml.emitter.EmitterError
+SerializerError = yaml.serializer.SerializerError
+RepresenterError = yaml.representer.RepresenterError
+
+StreamStartToken = yaml.tokens.StreamStartToken
+StreamEndToken = yaml.tokens.StreamEndToken
+DirectiveToken = yaml.tokens.DirectiveToken
+DocumentStartToken = yaml.tokens.DocumentStartToken
+DocumentEndToken = yaml.tokens.DocumentEndToken
+BlockSequenceStartToken = yaml.tokens.BlockSequenceStartToken
+BlockMappingStartToken = yaml.tokens.BlockMappingStartToken
+BlockEndToken = yaml.tokens.BlockEndToken
+FlowSequenceStartToken = yaml.tokens.FlowSequenceStartToken
+FlowMappingStartToken = yaml.tokens.FlowMappingStartToken
+FlowSequenceEndToken = yaml.tokens.FlowSequenceEndToken
+FlowMappingEndToken = yaml.tokens.FlowMappingEndToken
+KeyToken = yaml.tokens.KeyToken
+ValueToken = yaml.tokens.ValueToken
+BlockEntryToken = yaml.tokens.BlockEntryToken
+FlowEntryToken = yaml.tokens.FlowEntryToken
+AliasToken = yaml.tokens.AliasToken
+AnchorToken = yaml.tokens.AnchorToken
+TagToken = yaml.tokens.TagToken
+ScalarToken = yaml.tokens.ScalarToken
+
+StreamStartEvent = yaml.events.StreamStartEvent
+StreamEndEvent = yaml.events.StreamEndEvent
+DocumentStartEvent = yaml.events.DocumentStartEvent
+DocumentEndEvent = yaml.events.DocumentEndEvent
+AliasEvent = yaml.events.AliasEvent
+ScalarEvent = yaml.events.ScalarEvent
+SequenceStartEvent = yaml.events.SequenceStartEvent
+SequenceEndEvent = yaml.events.SequenceEndEvent
+MappingStartEvent = yaml.events.MappingStartEvent
+MappingEndEvent = yaml.events.MappingEndEvent
+
+ScalarNode = yaml.nodes.ScalarNode
+SequenceNode = yaml.nodes.SequenceNode
+MappingNode = yaml.nodes.MappingNode
+
+cdef class Mark:
+    cdef readonly object name
+    cdef readonly int index
+    cdef readonly int line
+    cdef readonly int column
+    cdef readonly buffer
+    cdef readonly pointer
+
+    def __init__(self, object name, int index, int line, int 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 occurence",
+                            self.anchors[anchor].start_mark, "second occurence", mark)
+                else:
+                    raise ComposerError(u"found duplicate anchor; first occurence",
+                            self.anchors[anchor].start_mark, u"second occurence", 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
+