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File Name : emitter.py

# Emitter expects events obeying the following grammar:
# stream ::= STREAM-START document* STREAM-END
# document ::= DOCUMENT-START node DOCUMENT-END
# node ::= SCALAR | sequence | mapping
# sequence ::= SEQUENCE-START node* SEQUENCE-END
# mapping ::= MAPPING-START (node node)* MAPPING-END

__all__ = ['Emitter', 'EmitterError']

from .error import YAMLError
from .events import *

class EmitterError(YAMLError):
    pass

class ScalarAnalysis:
    def __init__(self, scalar, empty, multiline,
            allow_flow_plain, allow_block_plain,
            allow_single_quoted, allow_double_quoted,
            allow_block):
        self.scalar = scalar
        self.empty = empty
        self.multiline = multiline
        self.allow_flow_plain = allow_flow_plain
        self.allow_block_plain = allow_block_plain
        self.allow_single_quoted = allow_single_quoted
        self.allow_double_quoted = allow_double_quoted
        self.allow_block = allow_block

class Emitter:

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

def __init__(self, stream, canonical=None, indent=None, width=None,
            allow_unicode=None, line_break=None):

# The stream should have the methods `write` and possibly `flush`.
        self.stream = stream

# Encoding can be overriden by STREAM-START.
        self.encoding = None

# Emitter is a state machine with a stack of states to handle nested
        # structures.
        self.states = []
        self.state = self.expect_stream_start

# Current event and the event queue.
        self.events = []
        self.event = None

# The current indentation level and the stack of previous indents.
        self.indents = []
        self.indent = None

# Flow level.
        self.flow_level = 0

# Contexts.
        self.root_context = False
        self.sequence_context = False
        self.mapping_context = False
        self.simple_key_context = False

# Characteristics of the last emitted character:
        #  - current position.
        #  - is it a whitespace?
        #  - is it an indention character
        #    (indentation space, '-', '?', or ':')?
        self.line = 0
        self.column = 0
        self.whitespace = True
        self.indention = True

# Whether the document requires an explicit document indicator
        self.open_ended = False

# Formatting details.
        self.canonical = canonical
        self.allow_unicode = allow_unicode
        self.best_indent = 2
        if indent and 1 < indent < 10:
            self.best_indent = indent
        self.best_width = 80
        if width and width > self.best_indent*2:
            self.best_width = width
        self.best_line_break = '\n'
        if line_break in ['\r', '\n', '\r\n']:
            self.best_line_break = line_break

# Tag prefixes.
        self.tag_prefixes = None

# Prepared anchor and tag.
        self.prepared_anchor = None
        self.prepared_tag = None

# Scalar analysis and style.
        self.analysis = None
        self.style = None

def dispose(self):
        # Reset the state attributes (to clear self-references)
        self.states = []
        self.state = None

def emit(self, event):
        self.events.append(event)
        while not self.need_more_events():
            self.event = self.events.pop(0)
            self.state()
            self.event = None

# In some cases, we wait for a few next events before emitting.

def need_more_events(self):
        if not self.events:
            return True
        event = self.events[0]
        if isinstance(event, DocumentStartEvent):
            return self.need_events(1)
        elif isinstance(event, SequenceStartEvent):
            return self.need_events(2)
        elif isinstance(event, MappingStartEvent):
            return self.need_events(3)
        else:
            return False

def need_events(self, count):
        level = 0
        for event in self.events[1:]:
            if isinstance(event, (DocumentStartEvent, CollectionStartEvent)):
                level += 1
            elif isinstance(event, (DocumentEndEvent, CollectionEndEvent)):
                level -= 1
            elif isinstance(event, StreamEndEvent):
                level = -1
            if level < 0:
                return False
        return (len(self.events) < count+1)

def increase_indent(self, flow=False, indentless=False):
        self.indents.append(self.indent)
        if self.indent is None:
            if flow:
                self.indent = self.best_indent
            else:
                self.indent = 0
        elif not indentless:
            self.indent += self.best_indent

# States.

# Stream handlers.

def expect_stream_start(self):
        if isinstance(self.event, StreamStartEvent):
            if self.event.encoding and not hasattr(self.stream, 'encoding'):
                self.encoding = self.event.encoding
            self.write_stream_start()
            self.state = self.expect_first_document_start
        else:
            raise EmitterError("expected StreamStartEvent, but got %s"
                    % self.event)

def expect_nothing(self):
        raise EmitterError("expected nothing, but got %s" % self.event)

# Document handlers.

def expect_first_document_start(self):
        return self.expect_document_start(first=True)

def expect_document_start(self, first=False):
        if isinstance(self.event, DocumentStartEvent):
            if (self.event.version or self.event.tags) and self.open_ended:
                self.write_indicator('...', True)
                self.write_indent()
            if self.event.version:
                version_text = self.prepare_version(self.event.version)
                self.write_version_directive(version_text)
            self.tag_prefixes = self.DEFAULT_TAG_PREFIXES.copy()
            if self.event.tags:
                handles = sorted(self.event.tags.keys())
                for handle in handles:
                    prefix = self.event.tags[handle]
                    self.tag_prefixes[prefix] = handle
                    handle_text = self.prepare_tag_handle(handle)
                    prefix_text = self.prepare_tag_prefix(prefix)
                    self.write_tag_directive(handle_text, prefix_text)
            implicit = (first and not self.event.explicit and not self.canonical
                    and not self.event.version and not self.event.tags
                    and not self.check_empty_document())
            if not implicit:
                self.write_indent()
                self.write_indicator('---', True)
                if self.canonical:
                    self.write_indent()
            self.state = self.expect_document_root
        elif isinstance(self.event, StreamEndEvent):
            if self.open_ended:
                self.write_indicator('...', True)
                self.write_indent()
            self.write_stream_end()
            self.state = self.expect_nothing
        else:
            raise EmitterError("expected DocumentStartEvent, but got %s"
                    % self.event)

def expect_document_end(self):
        if isinstance(self.event, DocumentEndEvent):
            self.write_indent()
            if self.event.explicit:
                self.write_indicator('...', True)
                self.write_indent()
            self.flush_stream()
            self.state = self.expect_document_start
        else:
            raise EmitterError("expected DocumentEndEvent, but got %s"
                    % self.event)

def expect_document_root(self):
        self.states.append(self.expect_document_end)
        self.expect_node(root=True)

# Node handlers.

def expect_node(self, root=False, sequence=False, mapping=False,
            simple_key=False):
        self.root_context = root
        self.sequence_context = sequence
        self.mapping_context = mapping
        self.simple_key_context = simple_key
        if isinstance(self.event, AliasEvent):
            self.expect_alias()
        elif isinstance(self.event, (ScalarEvent, CollectionStartEvent)):
            self.process_anchor('&')
            self.process_tag()
            if isinstance(self.event, ScalarEvent):
                self.expect_scalar()
            elif isinstance(self.event, SequenceStartEvent):
                if self.flow_level or self.canonical or self.event.flow_style   \
                        or self.check_empty_sequence():
                    self.expect_flow_sequence()
                else:
                    self.expect_block_sequence()
            elif isinstance(self.event, MappingStartEvent):
                if self.flow_level or self.canonical or self.event.flow_style   \
                        or self.check_empty_mapping():
                    self.expect_flow_mapping()
                else:
                    self.expect_block_mapping()
        else:
            raise EmitterError("expected NodeEvent, but got %s" % self.event)

def expect_alias(self):
        if self.event.anchor is None:
            raise EmitterError("anchor is not specified for alias")
        self.process_anchor('*')
        self.state = self.states.pop()

def expect_scalar(self):
        self.increase_indent(flow=True)
        self.process_scalar()
        self.indent = self.indents.pop()
        self.state = self.states.pop()

# Flow sequence handlers.

def expect_flow_sequence(self):
        self.write_indicator('[', True, whitespace=True)
        self.flow_level += 1
        self.increase_indent(flow=True)
        self.state = self.expect_first_flow_sequence_item

def expect_first_flow_sequence_item(self):
        if isinstance(self.event, SequenceEndEvent):
            self.indent = self.indents.pop()
            self.flow_level -= 1
            self.write_indicator(']', False)
            self.state = self.states.pop()
        else:
            if self.canonical or self.column > self.best_width:
                self.write_indent()
            self.states.append(self.expect_flow_sequence_item)
            self.expect_node(sequence=True)

def expect_flow_sequence_item(self):
        if isinstance(self.event, SequenceEndEvent):
            self.indent = self.indents.pop()
            self.flow_level -= 1
            if self.canonical:
                self.write_indicator(',', False)
                self.write_indent()
            self.write_indicator(']', False)
            self.state = self.states.pop()
        else:
            self.write_indicator(',', False)
            if self.canonical or self.column > self.best_width:
                self.write_indent()
            self.states.append(self.expect_flow_sequence_item)
            self.expect_node(sequence=True)

# Flow mapping handlers.

def expect_flow_mapping(self):
        self.write_indicator('{', True, whitespace=True)
        self.flow_level += 1
        self.increase_indent(flow=True)
        self.state = self.expect_first_flow_mapping_key

def expect_first_flow_mapping_key(self):
        if isinstance(self.event, MappingEndEvent):
            self.indent = self.indents.pop()
            self.flow_level -= 1
            self.write_indicator('}', False)
            self.state = self.states.pop()
        else:
            if self.canonical or self.column > self.best_width:
                self.write_indent()
            if not self.canonical and self.check_simple_key():
                self.states.append(self.expect_flow_mapping_simple_value)
                self.expect_node(mapping=True, simple_key=True)
            else:
                self.write_indicator('?', True)
                self.states.append(self.expect_flow_mapping_value)
                self.expect_node(mapping=True)

def expect_flow_mapping_key(self):
        if isinstance(self.event, MappingEndEvent):
            self.indent = self.indents.pop()
            self.flow_level -= 1
            if self.canonical:
                self.write_indicator(',', False)
                self.write_indent()
            self.write_indicator('}', False)
            self.state = self.states.pop()
        else:
            self.write_indicator(',', False)
            if self.canonical or self.column > self.best_width:
                self.write_indent()
            if not self.canonical and self.check_simple_key():
                self.states.append(self.expect_flow_mapping_simple_value)
                self.expect_node(mapping=True, simple_key=True)
            else:
                self.write_indicator('?', True)
                self.states.append(self.expect_flow_mapping_value)
                self.expect_node(mapping=True)

def expect_flow_mapping_simple_value(self):
        self.write_indicator(':', False)
        self.states.append(self.expect_flow_mapping_key)
        self.expect_node(mapping=True)

def expect_flow_mapping_value(self):
        if self.canonical or self.column > self.best_width:
            self.write_indent()
        self.write_indicator(':', True)
        self.states.append(self.expect_flow_mapping_key)
        self.expect_node(mapping=True)

# Block sequence handlers.

def expect_block_sequence(self):
        indentless = (self.mapping_context and not self.indention)
        self.increase_indent(flow=False, indentless=indentless)
        self.state = self.expect_first_block_sequence_item

def expect_first_block_sequence_item(self):
        return self.expect_block_sequence_item(first=True)

def expect_block_sequence_item(self, first=False):
        if not first and isinstance(self.event, SequenceEndEvent):
            self.indent = self.indents.pop()
            self.state = self.states.pop()
        else:
            self.write_indent()
            self.write_indicator('-', True, indention=True)
            self.states.append(self.expect_block_sequence_item)
            self.expect_node(sequence=True)

# Block mapping handlers.

def expect_block_mapping(self):
        self.increase_indent(flow=False)
        self.state = self.expect_first_block_mapping_key

def expect_first_block_mapping_key(self):
        return self.expect_block_mapping_key(first=True)

def expect_block_mapping_key(self, first=False):
        if not first and isinstance(self.event, MappingEndEvent):
            self.indent = self.indents.pop()
            self.state = self.states.pop()
        else:
            self.write_indent()
            if self.check_simple_key():
                self.states.append(self.expect_block_mapping_simple_value)
                self.expect_node(mapping=True, simple_key=True)
            else:
                self.write_indicator('?', True, indention=True)
                self.states.append(self.expect_block_mapping_value)
                self.expect_node(mapping=True)

def expect_block_mapping_simple_value(self):
        self.write_indicator(':', False)
        self.states.append(self.expect_block_mapping_key)
        self.expect_node(mapping=True)

def expect_block_mapping_value(self):
        self.write_indent()
        self.write_indicator(':', True, indention=True)
        self.states.append(self.expect_block_mapping_key)
        self.expect_node(mapping=True)

# Checkers.

def check_empty_sequence(self):
        return (isinstance(self.event, SequenceStartEvent) and self.events
                and isinstance(self.events[0], SequenceEndEvent))

def check_empty_mapping(self):
        return (isinstance(self.event, MappingStartEvent) and self.events
                and isinstance(self.events[0], MappingEndEvent))

def check_empty_document(self):
        if not isinstance(self.event, DocumentStartEvent) or not self.events:
            return False
        event = self.events[0]
        return (isinstance(event, ScalarEvent) and event.anchor is None
                and event.tag is None and event.implicit and event.value == '')

def check_simple_key(self):
        length = 0
        if isinstance(self.event, NodeEvent) and self.event.anchor is not None:
            if self.prepared_anchor is None:
                self.prepared_anchor = self.prepare_anchor(self.event.anchor)
            length += len(self.prepared_anchor)
        if isinstance(self.event, (ScalarEvent, CollectionStartEvent))  \
                and self.event.tag is not None:
            if self.prepared_tag is None:
                self.prepared_tag = self.prepare_tag(self.event.tag)
            length += len(self.prepared_tag)
        if isinstance(self.event, ScalarEvent):
            if self.analysis is None:
                self.analysis = self.analyze_scalar(self.event.value)
            length += len(self.analysis.scalar)
        return (length < 128 and (isinstance(self.event, AliasEvent)
            or (isinstance(self.event, ScalarEvent)
                    and not self.analysis.empty and not self.analysis.multiline)
            or self.check_empty_sequence() or self.check_empty_mapping()))

# Anchor, Tag, and Scalar processors.

def process_anchor(self, indicator):
        if self.event.anchor is None:
            self.prepared_anchor = None
            return
        if self.prepared_anchor is None:
            self.prepared_anchor = self.prepare_anchor(self.event.anchor)
        if self.prepared_anchor:
            self.write_indicator(indicator+self.prepared_anchor, True)
        self.prepared_anchor = None

def process_tag(self):
        tag = self.event.tag
        if isinstance(self.event, ScalarEvent):
            if self.style is None:
                self.style = self.choose_scalar_style()
            if ((not self.canonical or tag is None) and
                ((self.style == '' and self.event.implicit[0])
                        or (self.style != '' and self.event.implicit[1]))):
                self.prepared_tag = None
                return
            if self.event.implicit[0] and tag is None:
                tag = '!'
                self.prepared_tag = None
        else:
            if (not self.canonical or tag is None) and self.event.implicit:
                self.prepared_tag = None
                return
        if tag is None:
            raise EmitterError("tag is not specified")
        if self.prepared_tag is None:
            self.prepared_tag = self.prepare_tag(tag)
        if self.prepared_tag:
            self.write_indicator(self.prepared_tag, True)
        self.prepared_tag = None

def choose_scalar_style(self):
        if self.analysis is None:
            self.analysis = self.analyze_scalar(self.event.value)
        if self.event.style == '"' or self.canonical:
            return '"'
        if not self.event.style and self.event.implicit[0]:
            if (not (self.simple_key_context and
                    (self.analysis.empty or self.analysis.multiline))
                and (self.flow_level and self.analysis.allow_flow_plain
                    or (not self.flow_level and self.analysis.allow_block_plain))):
                return ''
        if self.event.style and self.event.style in '|>':
            if (not self.flow_level and not self.simple_key_context
                    and self.analysis.allow_block):
                return self.event.style
        if not self.event.style or self.event.style == '\'':
            if (self.analysis.allow_single_quoted and
                    not (self.simple_key_context and self.analysis.multiline)):
                return '\''
        return '"'

def process_scalar(self):
        if self.analysis is None:
            self.analysis = self.analyze_scalar(self.event.value)
        if self.style is None:
            self.style = self.choose_scalar_style()
        split = (not self.simple_key_context)
        #if self.analysis.multiline and split    \
        #        and (not self.style or self.style in '\'\"'):
        #    self.write_indent()
        if self.style == '"':
            self.write_double_quoted(self.analysis.scalar, split)
        elif self.style == '\'':
            self.write_single_quoted(self.analysis.scalar, split)
        elif self.style == '>':
            self.write_folded(self.analysis.scalar)
        elif self.style == '|':
            self.write_literal(self.analysis.scalar)
        else:
            self.write_plain(self.analysis.scalar, split)
        self.analysis = None
        self.style = None

# Analyzers.

def prepare_version(self, version):
        major, minor = version
        if major != 1:
            raise EmitterError("unsupported YAML version: %d.%d" % (major, minor))
        return '%d.%d' % (major, minor)

def prepare_tag_handle(self, handle):
        if not handle:
            raise EmitterError("tag handle must not be empty")
        if handle[0] != '!' or handle[-1] != '!':
            raise EmitterError("tag handle must start and end with '!': %r" % handle)
        for ch in handle[1:-1]:
            if not ('0' <= ch <= '9' or 'A' <= ch <= 'Z' or 'a' <= ch <= 'z'    \
                    or ch in '-_'):
                raise EmitterError("invalid character %r in the tag handle: %r"
                        % (ch, handle))
        return handle

def prepare_tag_prefix(self, prefix):
        if not prefix:
            raise EmitterError("tag prefix must not be empty")
        chunks = []
        start = end = 0
        if prefix[0] == '!':
            end = 1
        while end < len(prefix):
            ch = prefix[end]
            if '0' <= ch <= '9' or 'A' <= ch <= 'Z' or 'a' <= ch <= 'z' \
                    or ch in '-;/?!:@&=+$,_.~*\'()[]':
                end += 1
            else:
                if start < end:
                    chunks.append(prefix[start:end])
                start = end = end+1
                data = ch.encode('utf-8')
                for ch in data:
                    chunks.append('%%%02X' % ord(ch))
        if start < end:
            chunks.append(prefix[start:end])
        return ''.join(chunks)

def prepare_tag(self, tag):
        if not tag:
            raise EmitterError("tag must not be empty")
        if tag == '!':
            return tag
        handle = None
        suffix = tag
        prefixes = sorted(self.tag_prefixes.keys())
        for prefix in prefixes:
            if tag.startswith(prefix)   \
                    and (prefix == '!' or len(prefix) < len(tag)):
                handle = self.tag_prefixes[prefix]
                suffix = tag[len(prefix):]
        chunks = []
        start = end = 0
        while end < len(suffix):
            ch = suffix[end]
            if '0' <= ch <= '9' or 'A' <= ch <= 'Z' or 'a' <= ch <= 'z' \
                    or ch in '-;/?:@&=+$,_.~*\'()[]'   \
                    or (ch == '!' and handle != '!'):
                end += 1
            else:
                if start < end:
                    chunks.append(suffix[start:end])
                start = end = end+1
                data = ch.encode('utf-8')
                for ch in data:
                    chunks.append('%%%02X' % ord(ch))
        if start < end:
            chunks.append(suffix[start:end])
        suffix_text = ''.join(chunks)
        if handle:
            return '%s%s' % (handle, suffix_text)
        else:
            return '!<%s>' % suffix_text

def prepare_anchor(self, anchor):
        if not anchor:
            raise EmitterError("anchor must not be empty")
        for ch in anchor:
            if not ('0' <= ch <= '9' or 'A' <= ch <= 'Z' or 'a' <= ch <= 'z'    \
                    or ch in '-_'):
                raise EmitterError("invalid character %r in the anchor: %r"
                        % (ch, anchor))
        return anchor

def analyze_scalar(self, scalar):

# Empty scalar is a special case.
        if not scalar:
            return ScalarAnalysis(scalar=scalar, empty=True, multiline=False,
                    allow_flow_plain=False, allow_block_plain=True,
                    allow_single_quoted=True, allow_double_quoted=True,
                    allow_block=False)

# Indicators and special characters.
        block_indicators = False
        flow_indicators = False
        line_breaks = False
        special_characters = False

# Important whitespace combinations.
        leading_space = False
        leading_break = False
        trailing_space = False
        trailing_break = False
        break_space = False
        space_break = False

# Check document indicators.
        if scalar.startswith('---') or scalar.startswith('...'):
            block_indicators = True
            flow_indicators = True

# First character or preceded by a whitespace.
        preceeded_by_whitespace = True

# Last character or followed by a whitespace.
        followed_by_whitespace = (len(scalar) == 1 or
                scalar[1] in '\0 \t\r\n\x85\u2028\u2029')

# The previous character is a space.
        previous_space = False

# The previous character is a break.
        previous_break = False

index = 0
        while index < len(scalar):
            ch = scalar[index]

# Check for indicators.
            if index == 0:
                # Leading indicators are special characters.
                if ch in '#,[]{}&*!|>\'\"%@`': 
                    flow_indicators = True
                    block_indicators = True
                if ch in '?:':
                    flow_indicators = True
                    if followed_by_whitespace:
                        block_indicators = True
                if ch == '-' and followed_by_whitespace:
                    flow_indicators = True
                    block_indicators = True
            else:
                # Some indicators cannot appear within a scalar as well.
                if ch in ',?[]{}':
                    flow_indicators = True
                if ch == ':':
                    flow_indicators = True
                    if followed_by_whitespace:
                        block_indicators = True
                if ch == '#' and preceeded_by_whitespace:
                    flow_indicators = True
                    block_indicators = True

# Check for line breaks, special, and unicode characters.
            if ch in '\n\x85\u2028\u2029':
                line_breaks = True
            if not (ch == '\n' or '\x20' <= ch <= '\x7E'):
                if (ch == '\x85' or '\xA0' <= ch <= '\uD7FF'
                        or '\uE000' <= ch <= '\uFFFD') and ch != '\uFEFF':
                    unicode_characters = True
                    if not self.allow_unicode:
                        special_characters = True
                else:
                    special_characters = True

# Detect important whitespace combinations.
            if ch == ' ':
                if index == 0:
                    leading_space = True
                if index == len(scalar)-1:
                    trailing_space = True
                if previous_break:
                    break_space = True
                previous_space = True
                previous_break = False
            elif ch in '\n\x85\u2028\u2029':
                if index == 0:
                    leading_break = True
                if index == len(scalar)-1:
                    trailing_break = True
                if previous_space:
                    space_break = True
                previous_space = False
                previous_break = True
            else:
                previous_space = False
                previous_break = False

# Prepare for the next character.
            index += 1
            preceeded_by_whitespace = (ch in '\0 \t\r\n\x85\u2028\u2029')
            followed_by_whitespace = (index+1 >= len(scalar) or
                    scalar[index+1] in '\0 \t\r\n\x85\u2028\u2029')

# Let's decide what styles are allowed.
        allow_flow_plain = True
        allow_block_plain = True
        allow_single_quoted = True
        allow_double_quoted = True
        allow_block = True

# Leading and trailing whitespaces are bad for plain scalars.
        if (leading_space or leading_break
                or trailing_space or trailing_break):
            allow_flow_plain = allow_block_plain = False

# We do not permit trailing spaces for block scalars.
        if trailing_space:
            allow_block = False

# Spaces at the beginning of a new line are only acceptable for block
        # scalars.
        if break_space:
            allow_flow_plain = allow_block_plain = allow_single_quoted = False

# Spaces followed by breaks, as well as special character are only
        # allowed for double quoted scalars.
        if space_break or special_characters:
            allow_flow_plain = allow_block_plain =  \
            allow_single_quoted = allow_block = False

# Although the plain scalar writer supports breaks, we never emit
        # multiline plain scalars.
        if line_breaks:
            allow_flow_plain = allow_block_plain = False

# Flow indicators are forbidden for flow plain scalars.
        if flow_indicators:
            allow_flow_plain = False

# Block indicators are forbidden for block plain scalars.
        if block_indicators:
            allow_block_plain = False

return ScalarAnalysis(scalar=scalar,
                empty=False, multiline=line_breaks,
                allow_flow_plain=allow_flow_plain,
                allow_block_plain=allow_block_plain,
                allow_single_quoted=allow_single_quoted,
                allow_double_quoted=allow_double_quoted,
                allow_block=allow_block)

# Writers.

def flush_stream(self):
        if hasattr(self.stream, 'flush'):
            self.stream.flush()

def write_stream_start(self):
        # Write BOM if needed.
        if self.encoding and self.encoding.startswith('utf-16'):
            self.stream.write('\uFEFF'.encode(self.encoding))

def write_stream_end(self):
        self.flush_stream()

def write_indicator(self, indicator, need_whitespace,
            whitespace=False, indention=False):
        if self.whitespace or not need_whitespace:
            data = indicator
        else:
            data = ' '+indicator
        self.whitespace = whitespace
        self.indention = self.indention and indention
        self.column += len(data)
        self.open_ended = False
        if self.encoding:
            data = data.encode(self.encoding)
        self.stream.write(data)

def write_indent(self):
        indent = self.indent or 0
        if not self.indention or self.column > indent   \
                or (self.column == indent and not self.whitespace):
            self.write_line_break()
        if self.column < indent:
            self.whitespace = True
            data = ' '*(indent-self.column)
            self.column = indent
            if self.encoding:
                data = data.encode(self.encoding)
            self.stream.write(data)

def write_line_break(self, data=None):
        if data is None:
            data = self.best_line_break
        self.whitespace = True
        self.indention = True
        self.line += 1
        self.column = 0
        if self.encoding:
            data = data.encode(self.encoding)
        self.stream.write(data)

def write_version_directive(self, version_text):
        data = '%%YAML %s' % version_text
        if self.encoding:
            data = data.encode(self.encoding)
        self.stream.write(data)
        self.write_line_break()

def write_tag_directive(self, handle_text, prefix_text):
        data = '%%TAG %s %s' % (handle_text, prefix_text)
        if self.encoding:
            data = data.encode(self.encoding)
        self.stream.write(data)
        self.write_line_break()

# Scalar streams.

def write_single_quoted(self, text, split=True):
        self.write_indicator('\'', True)
        spaces = False
        breaks = False
        start = end = 0
        while end <= len(text):
            ch = None
            if end < len(text):
                ch = text[end]
            if spaces:
                if ch is None or ch != ' ':
                    if start+1 == end and self.column > self.best_width and split   \
                            and start != 0 and end != len(text):
                        self.write_indent()
                    else:
                        data = text[start:end]
                        self.column += len(data)
                        if self.encoding:
                            data = data.encode(self.encoding)
                        self.stream.write(data)
                    start = end
            elif breaks:
                if ch is None or ch not in '\n\x85\u2028\u2029':
                    if text[start] == '\n':
                        self.write_line_break()
                    for br in text[start:end]:
                        if br == '\n':
                            self.write_line_break()
                        else:
                            self.write_line_break(br)
                    self.write_indent()
                    start = end
            else:
                if ch is None or ch in ' \n\x85\u2028\u2029' or ch == '\'':
                    if start < end:
                        data = text[start:end]
                        self.column += len(data)
                        if self.encoding:
                            data = data.encode(self.encoding)
                        self.stream.write(data)
                        start = end
            if ch == '\'':
                data = '\'\''
                self.column += 2
                if self.encoding:
                    data = data.encode(self.encoding)
                self.stream.write(data)
                start = end + 1
            if ch is not None:
                spaces = (ch == ' ')
                breaks = (ch in '\n\x85\u2028\u2029')
            end += 1
        self.write_indicator('\'', False)

ESCAPE_REPLACEMENTS = {
        '\0':       '0',
        '\x07':     'a',
        '\x08':     'b',
        '\x09':     't',
        '\x0A':     'n',
        '\x0B':     'v',
        '\x0C':     'f',
        '\x0D':     'r',
        '\x1B':     'e',
        '\"':       '\"',
        '\\':       '\\',
        '\x85':     'N',
        '\xA0':     '_',
        '\u2028':   'L',
        '\u2029':   'P',
    }

def write_double_quoted(self, text, split=True):
        self.write_indicator('"', True)
        start = end = 0
        while end <= len(text):
            ch = None
            if end < len(text):
                ch = text[end]
            if ch is None or ch in '"\\\x85\u2028\u2029\uFEFF' \
                    or not ('\x20' <= ch <= '\x7E'
                        or (self.allow_unicode
                            and ('\xA0' <= ch <= '\uD7FF'
                                or '\uE000' <= ch <= '\uFFFD'))):
                if start < end:
                    data = text[start:end]
                    self.column += len(data)
                    if self.encoding:
                        data = data.encode(self.encoding)
                    self.stream.write(data)
                    start = end
                if ch is not None:
                    if ch in self.ESCAPE_REPLACEMENTS:
                        data = '\\'+self.ESCAPE_REPLACEMENTS[ch]
                    elif ch <= '\xFF':
                        data = '\\x%02X' % ord(ch)
                    elif ch <= '\uFFFF':
                        data = '\\u%04X' % ord(ch)
                    else:
                        data = '\\U%08X' % ord(ch)
                    self.column += len(data)
                    if self.encoding:
                        data = data.encode(self.encoding)
                    self.stream.write(data)
                    start = end+1
            if 0 < end < len(text)-1 and (ch == ' ' or start >= end)    \
                    and self.column+(end-start) > self.best_width and split:
                data = text[start:end]+'\\'
                if start < end:
                    start = end
                self.column += len(data)
                if self.encoding:
                    data = data.encode(self.encoding)
                self.stream.write(data)
                self.write_indent()
                self.whitespace = False
                self.indention = False
                if text[start] == ' ':
                    data = '\\'
                    self.column += len(data)
                    if self.encoding:
                        data = data.encode(self.encoding)
                    self.stream.write(data)
            end += 1
        self.write_indicator('"', False)

def determine_block_hints(self, text):
        hints = ''
        if text:
            if text[0] in ' \n\x85\u2028\u2029':
                hints += str(self.best_indent)
            if text[-1] not in '\n\x85\u2028\u2029':
                hints += '-'
            elif len(text) == 1 or text[-2] in '\n\x85\u2028\u2029':
                hints += '+'
        return hints

def write_folded(self, text):
        hints = self.determine_block_hints(text)
        self.write_indicator('>'+hints, True)
        if hints[-1:] == '+':
            self.open_ended = True
        self.write_line_break()
        leading_space = True
        spaces = False
        breaks = True
        start = end = 0
        while end <= len(text):
            ch = None
            if end < len(text):
                ch = text[end]
            if breaks:
                if ch is None or ch not in '\n\x85\u2028\u2029':
                    if not leading_space and ch is not None and ch != ' '   \
                            and text[start] == '\n':
                        self.write_line_break()
                    leading_space = (ch == ' ')
                    for br in text[start:end]:
                        if br == '\n':
                            self.write_line_break()
                        else:
                            self.write_line_break(br)
                    if ch is not None:
                        self.write_indent()
                    start = end
            elif spaces:
                if ch != ' ':
                    if start+1 == end and self.column > self.best_width:
                        self.write_indent()
                    else:
                        data = text[start:end]
                        self.column += len(data)
                        if self.encoding:
                            data = data.encode(self.encoding)
                        self.stream.write(data)
                    start = end
            else:
                if ch is None or ch in ' \n\x85\u2028\u2029':
                    data = text[start:end]
                    self.column += len(data)
                    if self.encoding:
                        data = data.encode(self.encoding)
                    self.stream.write(data)
                    if ch is None:
                        self.write_line_break()
                    start = end
            if ch is not None:
                breaks = (ch in '\n\x85\u2028\u2029')
                spaces = (ch == ' ')
            end += 1

def write_literal(self, text):
        hints = self.determine_block_hints(text)
        self.write_indicator('|'+hints, True)
        if hints[-1:] == '+':
            self.open_ended = True
        self.write_line_break()
        breaks = True
        start = end = 0
        while end <= len(text):
            ch = None
            if end < len(text):
                ch = text[end]
            if breaks:
                if ch is None or ch not in '\n\x85\u2028\u2029':
                    for br in text[start:end]:
                        if br == '\n':
                            self.write_line_break()
                        else:
                            self.write_line_break(br)
                    if ch is not None:
                        self.write_indent()
                    start = end
            else:
                if ch is None or ch in '\n\x85\u2028\u2029':
                    data = text[start:end]
                    if self.encoding:
                        data = data.encode(self.encoding)
                    self.stream.write(data)
                    if ch is None:
                        self.write_line_break()
                    start = end
            if ch is not None:
                breaks = (ch in '\n\x85\u2028\u2029')
            end += 1

def write_plain(self, text, split=True):
        if self.root_context:
            self.open_ended = True
        if not text:
            return
        if not self.whitespace:
            data = ' '
            self.column += len(data)
            if self.encoding:
                data = data.encode(self.encoding)
            self.stream.write(data)
        self.whitespace = False
        self.indention = False
        spaces = False
        breaks = False
        start = end = 0
        while end <= len(text):
            ch = None
            if end < len(text):
                ch = text[end]
            if spaces:
                if ch != ' ':
                    if start+1 == end and self.column > self.best_width and split:
                        self.write_indent()
                        self.whitespace = False
                        self.indention = False
                    else:
                        data = text[start:end]
                        self.column += len(data)
                        if self.encoding:
                            data = data.encode(self.encoding)
                        self.stream.write(data)
                    start = end
            elif breaks:
                if ch not in '\n\x85\u2028\u2029':
                    if text[start] == '\n':
                        self.write_line_break()
                    for br in text[start:end]:
                        if br == '\n':
                            self.write_line_break()
                        else:
                            self.write_line_break(br)
                    self.write_indent()
                    self.whitespace = False
                    self.indention = False
                    start = end
            else:
                if ch is None or ch in ' \n\x85\u2028\u2029':
                    data = text[start:end]
                    self.column += len(data)
                    if self.encoding:
                        data = data.encode(self.encoding)
                    self.stream.write(data)
                    start = end
            if ch is not None:
                spaces = (ch == ' ')
                breaks = (ch in '\n\x85\u2028\u2029')
            end += 1

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-03-03 10:15:44
..	dir	-	root/root	0755	2025-10-29 06:30:51
__pycache__	dir	-	root/root	0755	2024-03-03 10:15:44
__init__.py	text/x-script.python	9.38 KB	root/root	0644	2016-08-28 11:56:44
composer.py	text/x-script.python	4.77 KB	root/root	0644	2016-08-28 11:56:44
constructor.py	text/x-script.python	24.96 KB	root/root	0644	2016-08-28 11:56:44
cyaml.py	text/x-script.python	3.22 KB	root/root	0644	2016-08-28 11:56:44
dumper.py	text/x-script.python	2.66 KB	root/root	0644	2016-08-28 11:56:44
emitter.py	text/x-script.python	41.95 KB	root/root	0644	2016-08-28 11:56:44
error.py	text/x-script.python	2.47 KB	root/root	0644	2016-08-28 11:56:44
events.py	text/x-script.python	2.39 KB	root/root	0644	2016-08-28 11:56:44
loader.py	text/x-script.python	1.11 KB	root/root	0644	2016-08-28 11:56:44
nodes.py	text/x-script.python	1.41 KB	root/root	0644	2016-08-28 11:56:44
parser.py	text/x-script.python	24.9 KB	root/root	0644	2016-08-28 11:56:44
reader.py	text/x-script.python	6.69 KB	root/root	0644	2016-08-28 11:56:44
representer.py	text/x-script.python	13.77 KB	root/root	0644	2016-08-28 11:56:44
resolver.py	text/x-script.python	8.76 KB	root/root	0644	2016-08-28 11:56:44
scanner.py	text/x-script.python	50.48 KB	root/root	0644	2016-08-28 11:56:44
serializer.py	text/x-script.python	4.07 KB	root/root	0644	2016-08-28 11:56:44
tokens.py	text/x-script.python	2.51 KB	root/root	0644	2016-08-28 11:56:44

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