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Diffstat (limited to 'python.d/python_modules/pyyaml3/emitter.py')
| -rw-r--r-- | python.d/python_modules/pyyaml3/emitter.py | 1137 |
1 files changed, 0 insertions, 1137 deletions
diff --git a/python.d/python_modules/pyyaml3/emitter.py b/python.d/python_modules/pyyaml3/emitter.py deleted file mode 100644 index 34cb145a5..000000000 --- a/python.d/python_modules/pyyaml3/emitter.py +++ /dev/null @@ -1,1137 +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 * - -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 - |