289 lines
9.1 KiB
Python
289 lines
9.1 KiB
Python
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from error import *
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from tokens import *
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from events import *
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from nodes import *
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from loader import *
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from dumper import *
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__version__ = '3.08'
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try:
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from cyaml import *
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__with_libyaml__ = True
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except ImportError:
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__with_libyaml__ = False
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def scan(stream, Loader=Loader):
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"""
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Scan a YAML stream and produce scanning tokens.
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"""
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loader = Loader(stream)
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while loader.check_token():
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yield loader.get_token()
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def parse(stream, Loader=Loader):
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"""
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Parse a YAML stream and produce parsing events.
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"""
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loader = Loader(stream)
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while loader.check_event():
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yield loader.get_event()
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def compose(stream, Loader=Loader):
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"""
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Parse the first YAML document in a stream
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and produce the corresponding representation tree.
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"""
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loader = Loader(stream)
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return loader.get_single_node()
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def compose_all(stream, Loader=Loader):
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"""
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Parse all YAML documents in a stream
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and produce corresponsing representation trees.
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"""
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loader = Loader(stream)
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while loader.check_node():
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yield loader.get_node()
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def load(stream, Loader=Loader):
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"""
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Parse the first YAML document in a stream
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and produce the corresponding Python object.
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"""
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loader = Loader(stream)
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return loader.get_single_data()
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def load_all(stream, Loader=Loader):
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"""
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Parse all YAML documents in a stream
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and produce corresponding Python objects.
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"""
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loader = Loader(stream)
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while loader.check_data():
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yield loader.get_data()
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def safe_load(stream):
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"""
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Parse the first YAML document in a stream
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and produce the corresponding Python object.
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Resolve only basic YAML tags.
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"""
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return load(stream, SafeLoader)
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def safe_load_all(stream):
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"""
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Parse all YAML documents in a stream
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and produce corresponding Python objects.
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Resolve only basic YAML tags.
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"""
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return load_all(stream, SafeLoader)
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def emit(events, stream=None, Dumper=Dumper,
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canonical=None, indent=None, width=None,
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allow_unicode=None, line_break=None):
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"""
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Emit YAML parsing events into a stream.
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If stream is None, return the produced string instead.
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"""
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getvalue = None
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if stream is None:
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from StringIO import StringIO
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stream = StringIO()
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getvalue = stream.getvalue
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dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
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allow_unicode=allow_unicode, line_break=line_break)
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for event in events:
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dumper.emit(event)
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if getvalue:
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return getvalue()
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def serialize_all(nodes, stream=None, Dumper=Dumper,
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canonical=None, indent=None, width=None,
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allow_unicode=None, line_break=None,
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encoding='utf-8', explicit_start=None, explicit_end=None,
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version=None, tags=None):
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"""
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Serialize a sequence of representation trees into a YAML stream.
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If stream is None, return the produced string instead.
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"""
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getvalue = None
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if stream is None:
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if encoding is None:
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from StringIO import StringIO
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else:
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from cStringIO import StringIO
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stream = StringIO()
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getvalue = stream.getvalue
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dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
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allow_unicode=allow_unicode, line_break=line_break,
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encoding=encoding, version=version, tags=tags,
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explicit_start=explicit_start, explicit_end=explicit_end)
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dumper.open()
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for node in nodes:
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dumper.serialize(node)
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dumper.close()
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if getvalue:
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return getvalue()
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def serialize(node, stream=None, Dumper=Dumper, **kwds):
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"""
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Serialize a representation tree into a YAML stream.
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If stream is None, return the produced string instead.
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"""
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return serialize_all([node], stream, Dumper=Dumper, **kwds)
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def dump_all(documents, stream=None, Dumper=Dumper,
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default_style=None, default_flow_style=None,
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canonical=None, indent=None, width=None,
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allow_unicode=None, line_break=None,
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encoding='utf-8', explicit_start=None, explicit_end=None,
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version=None, tags=None):
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"""
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Serialize a sequence of Python objects into a YAML stream.
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If stream is None, return the produced string instead.
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"""
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getvalue = None
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if stream is None:
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if encoding is None:
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from StringIO import StringIO
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else:
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from cStringIO import StringIO
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stream = StringIO()
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getvalue = stream.getvalue
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dumper = Dumper(stream, default_style=default_style,
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default_flow_style=default_flow_style,
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canonical=canonical, indent=indent, width=width,
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allow_unicode=allow_unicode, line_break=line_break,
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encoding=encoding, version=version, tags=tags,
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explicit_start=explicit_start, explicit_end=explicit_end)
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dumper.open()
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for data in documents:
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dumper.represent(data)
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dumper.close()
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if getvalue:
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return getvalue()
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def dump(data, stream=None, Dumper=Dumper, **kwds):
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"""
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Serialize a Python object into a YAML stream.
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If stream is None, return the produced string instead.
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"""
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return dump_all([data], stream, Dumper=Dumper, **kwds)
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def safe_dump_all(documents, stream=None, **kwds):
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"""
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Serialize a sequence of Python objects into a YAML stream.
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Produce only basic YAML tags.
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If stream is None, return the produced string instead.
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"""
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return dump_all(documents, stream, Dumper=SafeDumper, **kwds)
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def safe_dump(data, stream=None, **kwds):
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"""
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Serialize a Python object into a YAML stream.
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Produce only basic YAML tags.
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If stream is None, return the produced string instead.
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"""
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return dump_all([data], stream, Dumper=SafeDumper, **kwds)
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def add_implicit_resolver(tag, regexp, first=None,
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Loader=Loader, Dumper=Dumper):
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"""
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Add an implicit scalar detector.
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If an implicit scalar value matches the given regexp,
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the corresponding tag is assigned to the scalar.
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first is a sequence of possible initial characters or None.
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"""
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Loader.add_implicit_resolver(tag, regexp, first)
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Dumper.add_implicit_resolver(tag, regexp, first)
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def add_path_resolver(tag, path, kind=None, Loader=Loader, Dumper=Dumper):
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"""
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Add a path based resolver for the given tag.
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A path is a list of keys that forms a path
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to a node in the representation tree.
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Keys can be string values, integers, or None.
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"""
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Loader.add_path_resolver(tag, path, kind)
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Dumper.add_path_resolver(tag, path, kind)
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def add_constructor(tag, constructor, Loader=Loader):
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"""
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Add a constructor for the given tag.
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Constructor is a function that accepts a Loader instance
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and a node object and produces the corresponding Python object.
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"""
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Loader.add_constructor(tag, constructor)
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def add_multi_constructor(tag_prefix, multi_constructor, Loader=Loader):
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"""
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Add a multi-constructor for the given tag prefix.
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Multi-constructor is called for a node if its tag starts with tag_prefix.
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Multi-constructor accepts a Loader instance, a tag suffix,
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and a node object and produces the corresponding Python object.
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"""
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Loader.add_multi_constructor(tag_prefix, multi_constructor)
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def add_representer(data_type, representer, Dumper=Dumper):
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"""
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Add a representer for the given type.
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Representer is a function accepting a Dumper instance
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and an instance of the given data type
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and producing the corresponding representation node.
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"""
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Dumper.add_representer(data_type, representer)
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def add_multi_representer(data_type, multi_representer, Dumper=Dumper):
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"""
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Add a representer for the given type.
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Multi-representer is a function accepting a Dumper instance
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and an instance of the given data type or subtype
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and producing the corresponding representation node.
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"""
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Dumper.add_multi_representer(data_type, multi_representer)
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class YAMLObjectMetaclass(type):
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"""
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The metaclass for YAMLObject.
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"""
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def __init__(cls, name, bases, kwds):
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super(YAMLObjectMetaclass, cls).__init__(name, bases, kwds)
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if 'yaml_tag' in kwds and kwds['yaml_tag'] is not None:
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cls.yaml_loader.add_constructor(cls.yaml_tag, cls.from_yaml)
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cls.yaml_dumper.add_representer(cls, cls.to_yaml)
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class YAMLObject(object):
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"""
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An object that can dump itself to a YAML stream
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and load itself from a YAML stream.
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"""
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__metaclass__ = YAMLObjectMetaclass
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__slots__ = () # no direct instantiation, so allow immutable subclasses
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yaml_loader = Loader
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yaml_dumper = Dumper
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yaml_tag = None
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yaml_flow_style = None
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def from_yaml(cls, loader, node):
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"""
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Convert a representation node to a Python object.
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"""
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return loader.construct_yaml_object(node, cls)
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from_yaml = classmethod(from_yaml)
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def to_yaml(cls, dumper, data):
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"""
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Convert a Python object to a representation node.
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"""
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return dumper.represent_yaml_object(cls.yaml_tag, data, cls,
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flow_style=cls.yaml_flow_style)
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to_yaml = classmethod(to_yaml)
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