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authorDan Klein <danklei@cisco.com>2015-08-26 18:16:09 +0300
committerDan Klein <danklei@cisco.com>2015-08-26 18:16:09 +0300
commitf8ac9d14a989c8cf1535e16165551dfa370b0b74 (patch)
tree43e396eb5d096ad74ec02afeccf8995a4d241a0f /external_libs/python/PyYAML-3.01/lib/yaml/emitter.py
parentcdcc62972d42f009f55e6aeb2ca5c60c3acd75eb (diff)
parent53f0e28d7f30c7175cbb15884c309613593859d8 (diff)
Merge branch 'master' into dan_stateless
Diffstat (limited to 'external_libs/python/PyYAML-3.01/lib/yaml/emitter.py')
-rw-r--r--external_libs/python/PyYAML-3.01/lib/yaml/emitter.py1162
1 files changed, 0 insertions, 1162 deletions
diff --git a/external_libs/python/PyYAML-3.01/lib/yaml/emitter.py b/external_libs/python/PyYAML-3.01/lib/yaml/emitter.py
deleted file mode 100644
index a34c4526..00000000
--- a/external_libs/python/PyYAML-3.01/lib/yaml/emitter.py
+++ /dev/null
@@ -1,1162 +0,0 @@
-
-# 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 *
-
-import re
-
-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 = {
- u'!' : u'!',
- u'tag:yaml.org,2002:' : u'!!',
- }
-
- 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
-
- # 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 = u'\n'
- if line_break in [u'\r', u'\n', u'\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 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:
- 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:
- 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 = self.event.tags.keys()
- handles.sort()
- 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(u'---', True)
- if self.canonical:
- self.write_indent()
- self.state = self.expect_document_root
- elif isinstance(self.event, StreamEndEvent):
- 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(u'...', 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(u'&')
- 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(u'*')
- 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(u'[', 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(u']', 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(u',', False)
- self.write_indent()
- self.write_indicator(u']', False)
- self.state = self.states.pop()
- else:
- self.write_indicator(u',', 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(u'{', 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(u'}', 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(u'?', 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(u',', False)
- self.write_indent()
- self.write_indicator(u'}', False)
- self.state = self.states.pop()
- else:
- self.write_indicator(u',', 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(u'?', True)
- self.states.append(self.expect_flow_mapping_value)
- self.expect_node(mapping=True)
-
- def expect_flow_mapping_simple_value(self):
- self.write_indicator(u':', 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(u':', 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(u'-', 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(u'?', 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(u':', 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(u':', 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 == u'')
-
- 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 = u'!'
- 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 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 u'%d.%d' % (major, minor)
-
- def prepare_tag_handle(self, handle):
- if not handle:
- raise EmitterError("tag handle must not be empty")
- if handle[0] != u'!' or handle[-1] != u'!':
- raise EmitterError("tag handle must start and end with '!': %r"
- % (handle.encode('utf-8')))
- for ch in handle[1:-1]:
- if not (u'0' <= ch <= u'9' or u'A' <= ch <= 'Z' or u'a' <= ch <= 'z' \
- or ch in u'-_'):
- raise EmitterError("invalid character %r in the tag handle: %r"
- % (ch.encode('utf-8'), handle.encode('utf-8')))
- 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] == u'!':
- end = 1
- while end < len(prefix):
- ch = prefix[end]
- if u'0' <= ch <= u'9' or u'A' <= ch <= 'Z' or u'a' <= ch <= 'z' \
- or ch in u'-;/?!:@&=+$,_.~*\'()[]':
- end += 1
- else:
- if start < end:
- chunks.append(prefix[start:end])
- start = end = end+1
- data = ch.encode('utf-8')
- for ch in data:
- chunks.append(u'%%%02X' % ord(ch))
- if start < end:
- chunks.append(prefix[start:end])
- return u''.join(chunks)
-
- def prepare_tag(self, tag):
- if not tag:
- raise EmitterError("tag must not be empty")
- if tag == u'!':
- return tag
- handle = None
- suffix = tag
- for prefix in self.tag_prefixes:
- if tag.startswith(prefix) \
- and (prefix == u'!' or len(prefix) < len(tag)):
- handle = self.tag_prefixes[prefix]
- suffix = tag[len(prefix):]
- chunks = []
- start = end = 0
- while end < len(suffix):
- ch = suffix[end]
- if u'0' <= ch <= u'9' or u'A' <= ch <= 'Z' or u'a' <= ch <= 'z' \
- or ch in u'-;/?:@&=+$,_.~*\'()[]' \
- or (ch == u'!' and handle != u'!'):
- 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(u'%%%02X' % ord(ch))
- if start < end:
- chunks.append(suffix[start:end])
- suffix_text = u''.join(chunks)
- if handle:
- return u'%s%s' % (handle, suffix_text)
- else:
- return u'!<%s>' % suffix_text
-
- def prepare_anchor(self, anchor):
- if not anchor:
- raise EmitterError("anchor must not be empty")
- for ch in anchor:
- if not (u'0' <= ch <= u'9' or u'A' <= ch <= 'Z' or u'a' <= ch <= 'z' \
- or ch in u'-_'):
- raise EmitterError("invalid character %r in the anchor: %r"
- % (ch.encode('utf-8'), anchor.encode('utf-8')))
- 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
-
- # Whitespaces.
- inline_spaces = False # non-space space+ non-space
- inline_breaks = False # non-space break+ non-space
- leading_spaces = False # ^ space+ (non-space | $)
- leading_breaks = False # ^ break+ (non-space | $)
- trailing_spaces = False # (^ | non-space) space+ $
- trailing_breaks = False # (^ | non-space) break+ $
- inline_breaks_spaces = False # non-space break+ space+ non-space
- mixed_breaks_spaces = False # anything else
-
- # Check document indicators.
- if scalar.startswith(u'---') or scalar.startswith(u'...'):
- block_indicators = True
- flow_indicators = True
-
- # First character or preceded by a whitespace.
- preceeded_by_space = True
-
- # Last character or followed by a whitespace.
- followed_by_space = (len(scalar) == 1 or
- scalar[1] in u'\0 \t\r\n\x85\u2028\u2029')
-
- # The current series of whitespaces contain plain spaces.
- spaces = False
-
- # The current series of whitespaces contain line breaks.
- breaks = False
-
- # The current series of whitespaces contain a space followed by a
- # break.
- mixed = False
-
- # The current series of whitespaces start at the beginning of the
- # scalar.
- leading = False
-
- index = 0
- while index < len(scalar):
- ch = scalar[index]
-
- # Check for indicators.
-
- if index == 0:
- # Leading indicators are special characters.
- if ch in u'#,[]{}#&*!|>\'\"%@`':
- flow_indicators = True
- block_indicators = True
- if ch in u'?:':
- flow_indicators = True
- if followed_by_space:
- block_indicators = True
- if ch == u'-' and followed_by_space:
- flow_indicators = True
- block_indicators = True
- else:
- # Some indicators cannot appear within a scalar as well.
- if ch in u',?[]{}':
- flow_indicators = True
- if ch == u':':
- flow_indicators = True
- if followed_by_space:
- block_indicators = True
- if ch == u'#' and preceeded_by_space:
- flow_indicators = True
- block_indicators = True
-
- # Check for line breaks, special, and unicode characters.
-
- if ch in u'\n\x85\u2028\u2029':
- line_breaks = True
- if not (ch == u'\n' or u'\x20' <= ch <= u'\x7E'):
- if (ch == u'\x85' or u'\xA0' <= ch <= u'\uD7FF'
- or u'\uE000' <= ch <= u'\uFFFD') and ch != u'\uFEFF':
- unicode_characters = True
- if not self.allow_unicode:
- special_characters = True
- else:
- special_characters = True
-
- # Spaces, line breaks, and how they are mixed. State machine.
-
- # Start or continue series of whitespaces.
- if ch in u' \n\x85\u2028\u2029':
- if spaces and breaks:
- if ch != u' ': # break+ (space+ break+) => mixed
- mixed = True
- elif spaces:
- if ch != u' ': # (space+ break+) => mixed
- breaks = True
- mixed = True
- elif breaks:
- if ch == u' ': # break+ space+
- spaces = True
- else:
- leading = (index == 0)
- if ch == u' ': # space+
- spaces = True
- else: # break+
- breaks = True
-
- # Series of whitespaces ended with a non-space.
- elif spaces or breaks:
- if leading:
- if spaces and breaks:
- mixed_breaks_spaces = True
- elif spaces:
- leading_spaces = True
- elif breaks:
- leading_breaks = True
- else:
- if mixed:
- mixed_breaks_spaces = True
- elif spaces and breaks:
- inline_breaks_spaces = True
- elif spaces:
- inline_spaces = True
- elif breaks:
- inline_breaks = True
- spaces = breaks = mixed = leading = False
-
- # Series of whitespaces reach the end.
- if (spaces or breaks) and (index == len(scalar)-1):
- if spaces and breaks:
- mixed_breaks_spaces = True
- elif spaces:
- trailing_spaces = True
- if leading:
- leading_spaces = True
- elif breaks:
- trailing_breaks = True
- if leading:
- leading_breaks = True
- spaces = breaks = mixed = leading = False
-
- # Prepare for the next character.
- index += 1
- preceeded_by_space = (ch in u'\0 \t\r\n\x85\u2028\u2029')
- followed_by_space = (index+1 >= len(scalar) or
- scalar[index+1] in u'\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 whitespace are bad for plain scalars. We also
- # do not want to mess with leading whitespaces for block scalars.
- if leading_spaces or leading_breaks or trailing_spaces:
- allow_flow_plain = allow_block_plain = allow_block = False
-
- # Trailing breaks are fine for block scalars, but unacceptable for
- # plain scalars.
- if trailing_breaks:
- allow_flow_plain = allow_block_plain = False
-
- # The combination of (space+ break+) is only acceptable for block
- # scalars.
- if inline_breaks_spaces:
- allow_flow_plain = allow_block_plain = allow_single_quoted = False
-
- # Mixed spaces and breaks, as well as special character are only
- # allowed for double quoted scalars.
- if mixed_breaks_spaces or special_characters:
- allow_flow_plain = allow_block_plain = \
- allow_single_quoted = allow_block = False
-
- # We don't 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(u'\xFF\xFE'.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 = u' '+indicator
- self.whitespace = whitespace
- self.indention = self.indention and indention
- self.column += len(data)
- 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 = u' '*(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 = u'%%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 = u'%%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(u'\'', 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 != u' ':
- 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 u'\n\x85\u2028\u2029':
- if text[start] == u'\n':
- self.write_line_break()
- for br in text[start:end]:
- if br == u'\n':
- self.write_line_break()
- else:
- self.write_line_break(br)
- self.write_indent()
- start = end
- else:
- if ch is None or ch in u' \n\x85\u2028\u2029' or ch == u'\'':
- 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 == u'\'':
- data = u'\'\''
- 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 == u' ')
- breaks = (ch in u'\n\x85\u2028\u2029')
- end += 1
- self.write_indicator(u'\'', False)
-
- ESCAPE_REPLACEMENTS = {
- u'\0': u'0',
- u'\x07': u'a',
- u'\x08': u'b',
- u'\x09': u't',
- u'\x0A': u'n',
- u'\x0B': u'v',
- u'\x0C': u'f',
- u'\x0D': u'r',
- u'\x1B': u'e',
- u'\"': u'\"',
- u'\\': u'\\',
- u'\x85': u'N',
- u'\xA0': u'_',
- u'\u2028': u'L',
- u'\u2029': u'P',
- }
-
- def write_double_quoted(self, text, split=True):
- self.write_indicator(u'"', True)
- start = end = 0
- while end <= len(text):
- ch = None
- if end < len(text):
- ch = text[end]
- if ch is None or ch in u'"\\\x85\u2028\u2029\uFEFF' \
- or not (u'\x20' <= ch <= u'\x7E'
- or (self.allow_unicode
- and (u'\xA0' <= ch <= u'\uD7FF'
- or u'\uE000' <= ch <= u'\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 = u'\\'+self.ESCAPE_REPLACEMENTS[ch]
- elif ch <= u'\xFF':
- data = u'\\x%02X' % ord(ch)
- elif ch <= u'\uFFFF':
- data = u'\\u%04X' % ord(ch)
- else:
- data = u'\\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 == u' ' or start >= end) \
- and self.column+(end-start) > self.best_width and split:
- data = text[start:end]+u'\\'
- 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] == u' ':
- data = u'\\'
- self.column += len(data)
- if self.encoding:
- data = data.encode(self.encoding)
- self.stream.write(data)
- end += 1
- self.write_indicator(u'"', False)
-
- def determine_chomp(self, text):
- tail = text[-2:]
- while len(tail) < 2:
- tail = u' '+tail
- if tail[-1] in u'\n\x85\u2028\u2029':
- if tail[-2] in u'\n\x85\u2028\u2029':
- return u'+'
- else:
- return u''
- else:
- return u'-'
-
- def write_folded(self, text):
- chomp = self.determine_chomp(text)
- self.write_indicator(u'>'+chomp, True)
- self.write_indent()
- leading_space = False
- spaces = False
- breaks = False
- 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 u'\n\x85\u2028\u2029':
- if not leading_space and ch is not None and ch != u' ' \
- and text[start] == u'\n':
- self.write_line_break()
- leading_space = (ch == u' ')
- for br in text[start:end]:
- if br == u'\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 != u' ':
- 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 u' \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 u'\n\x85\u2028\u2029')
- spaces = (ch == u' ')
- end += 1
-
- def write_literal(self, text):
- chomp = self.determine_chomp(text)
- self.write_indicator(u'|'+chomp, True)
- self.write_indent()
- breaks = False
- 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 u'\n\x85\u2028\u2029':
- for br in text[start:end]:
- if br == u'\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 u'\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 u'\n\x85\u2028\u2029')
- end += 1
-
- def write_plain(self, text, split=True):
- if not text:
- return
- if not self.whitespace:
- data = u' '
- self.column += len(data)
- if self.encoding:
- data = data.encode(self.encoding)
- self.stream.write(data)
- self.writespace = 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 != u' ':
- if start+1 == end and self.column > self.best_width and split:
- self.write_indent()
- self.writespace = 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 u'\n\x85\u2028\u2029':
- if text[start] == u'\n':
- self.write_line_break()
- for br in text[start:end]:
- if br == u'\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 u' \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 == u' ')
- breaks = (ch in u'\n\x85\u2028\u2029')
- end += 1
-