316 lines
9.5 KiB
Python
316 lines
9.5 KiB
Python
|
|
from error import *
|
|
|
|
from tokens import *
|
|
from events import *
|
|
from nodes import *
|
|
|
|
from loader import *
|
|
from dumper import *
|
|
|
|
__version__ = '3.12'
|
|
|
|
try:
|
|
from cyaml import *
|
|
__with_libyaml__ = True
|
|
except ImportError:
|
|
__with_libyaml__ = False
|
|
|
|
def scan(stream, Loader=Loader):
|
|
"""
|
|
Scan a YAML stream and produce scanning tokens.
|
|
"""
|
|
loader = Loader(stream)
|
|
try:
|
|
while loader.check_token():
|
|
yield loader.get_token()
|
|
finally:
|
|
loader.dispose()
|
|
|
|
def parse(stream, Loader=Loader):
|
|
"""
|
|
Parse a YAML stream and produce parsing events.
|
|
"""
|
|
loader = Loader(stream)
|
|
try:
|
|
while loader.check_event():
|
|
yield loader.get_event()
|
|
finally:
|
|
loader.dispose()
|
|
|
|
def compose(stream, Loader=Loader):
|
|
"""
|
|
Parse the first YAML document in a stream
|
|
and produce the corresponding representation tree.
|
|
"""
|
|
loader = Loader(stream)
|
|
try:
|
|
return loader.get_single_node()
|
|
finally:
|
|
loader.dispose()
|
|
|
|
def compose_all(stream, Loader=Loader):
|
|
"""
|
|
Parse all YAML documents in a stream
|
|
and produce corresponding representation trees.
|
|
"""
|
|
loader = Loader(stream)
|
|
try:
|
|
while loader.check_node():
|
|
yield loader.get_node()
|
|
finally:
|
|
loader.dispose()
|
|
|
|
def load(stream, Loader=Loader):
|
|
"""
|
|
Parse the first YAML document in a stream
|
|
and produce the corresponding Python object.
|
|
"""
|
|
loader = Loader(stream)
|
|
try:
|
|
return loader.get_single_data()
|
|
finally:
|
|
loader.dispose()
|
|
|
|
def load_all(stream, Loader=Loader):
|
|
"""
|
|
Parse all YAML documents in a stream
|
|
and produce corresponding Python objects.
|
|
"""
|
|
loader = Loader(stream)
|
|
try:
|
|
while loader.check_data():
|
|
yield loader.get_data()
|
|
finally:
|
|
loader.dispose()
|
|
|
|
def safe_load(stream):
|
|
"""
|
|
Parse the first YAML document in a stream
|
|
and produce the corresponding Python object.
|
|
Resolve only basic YAML tags.
|
|
"""
|
|
return load(stream, SafeLoader)
|
|
|
|
def safe_load_all(stream):
|
|
"""
|
|
Parse all YAML documents in a stream
|
|
and produce corresponding Python objects.
|
|
Resolve only basic YAML tags.
|
|
"""
|
|
return load_all(stream, SafeLoader)
|
|
|
|
def emit(events, stream=None, Dumper=Dumper,
|
|
canonical=None, indent=None, width=None,
|
|
allow_unicode=None, line_break=None):
|
|
"""
|
|
Emit YAML parsing events into a stream.
|
|
If stream is None, return the produced string instead.
|
|
"""
|
|
getvalue = None
|
|
if stream is None:
|
|
from StringIO import StringIO
|
|
stream = StringIO()
|
|
getvalue = stream.getvalue
|
|
dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
|
|
allow_unicode=allow_unicode, line_break=line_break)
|
|
try:
|
|
for event in events:
|
|
dumper.emit(event)
|
|
finally:
|
|
dumper.dispose()
|
|
if getvalue:
|
|
return getvalue()
|
|
|
|
def serialize_all(nodes, stream=None, Dumper=Dumper,
|
|
canonical=None, indent=None, width=None,
|
|
allow_unicode=None, line_break=None,
|
|
encoding='utf-8', explicit_start=None, explicit_end=None,
|
|
version=None, tags=None):
|
|
"""
|
|
Serialize a sequence of representation trees into a YAML stream.
|
|
If stream is None, return the produced string instead.
|
|
"""
|
|
getvalue = None
|
|
if stream is None:
|
|
if encoding is None:
|
|
from StringIO import StringIO
|
|
else:
|
|
from cStringIO import StringIO
|
|
stream = StringIO()
|
|
getvalue = stream.getvalue
|
|
dumper = Dumper(stream, canonical=canonical, indent=indent, width=width,
|
|
allow_unicode=allow_unicode, line_break=line_break,
|
|
encoding=encoding, version=version, tags=tags,
|
|
explicit_start=explicit_start, explicit_end=explicit_end)
|
|
try:
|
|
dumper.open()
|
|
for node in nodes:
|
|
dumper.serialize(node)
|
|
dumper.close()
|
|
finally:
|
|
dumper.dispose()
|
|
if getvalue:
|
|
return getvalue()
|
|
|
|
def serialize(node, stream=None, Dumper=Dumper, **kwds):
|
|
"""
|
|
Serialize a representation tree into a YAML stream.
|
|
If stream is None, return the produced string instead.
|
|
"""
|
|
return serialize_all([node], stream, Dumper=Dumper, **kwds)
|
|
|
|
def dump_all(documents, stream=None, Dumper=Dumper,
|
|
default_style=None, default_flow_style=None,
|
|
canonical=None, indent=None, width=None,
|
|
allow_unicode=None, line_break=None,
|
|
encoding='utf-8', explicit_start=None, explicit_end=None,
|
|
version=None, tags=None):
|
|
"""
|
|
Serialize a sequence of Python objects into a YAML stream.
|
|
If stream is None, return the produced string instead.
|
|
"""
|
|
getvalue = None
|
|
if stream is None:
|
|
if encoding is None:
|
|
from StringIO import StringIO
|
|
else:
|
|
from cStringIO import StringIO
|
|
stream = StringIO()
|
|
getvalue = stream.getvalue
|
|
dumper = Dumper(stream, default_style=default_style,
|
|
default_flow_style=default_flow_style,
|
|
canonical=canonical, indent=indent, width=width,
|
|
allow_unicode=allow_unicode, line_break=line_break,
|
|
encoding=encoding, version=version, tags=tags,
|
|
explicit_start=explicit_start, explicit_end=explicit_end)
|
|
try:
|
|
dumper.open()
|
|
for data in documents:
|
|
dumper.represent(data)
|
|
dumper.close()
|
|
finally:
|
|
dumper.dispose()
|
|
if getvalue:
|
|
return getvalue()
|
|
|
|
def dump(data, stream=None, Dumper=Dumper, **kwds):
|
|
"""
|
|
Serialize a Python object into a YAML stream.
|
|
If stream is None, return the produced string instead.
|
|
"""
|
|
return dump_all([data], stream, Dumper=Dumper, **kwds)
|
|
|
|
def safe_dump_all(documents, stream=None, **kwds):
|
|
"""
|
|
Serialize a sequence of Python objects into a YAML stream.
|
|
Produce only basic YAML tags.
|
|
If stream is None, return the produced string instead.
|
|
"""
|
|
return dump_all(documents, stream, Dumper=SafeDumper, **kwds)
|
|
|
|
def safe_dump(data, stream=None, **kwds):
|
|
"""
|
|
Serialize a Python object into a YAML stream.
|
|
Produce only basic YAML tags.
|
|
If stream is None, return the produced string instead.
|
|
"""
|
|
return dump_all([data], stream, Dumper=SafeDumper, **kwds)
|
|
|
|
def add_implicit_resolver(tag, regexp, first=None,
|
|
Loader=Loader, Dumper=Dumper):
|
|
"""
|
|
Add an implicit scalar detector.
|
|
If an implicit scalar value matches the given regexp,
|
|
the corresponding tag is assigned to the scalar.
|
|
first is a sequence of possible initial characters or None.
|
|
"""
|
|
Loader.add_implicit_resolver(tag, regexp, first)
|
|
Dumper.add_implicit_resolver(tag, regexp, first)
|
|
|
|
def add_path_resolver(tag, path, kind=None, Loader=Loader, Dumper=Dumper):
|
|
"""
|
|
Add a path based resolver for the given tag.
|
|
A path is a list of keys that forms a path
|
|
to a node in the representation tree.
|
|
Keys can be string values, integers, or None.
|
|
"""
|
|
Loader.add_path_resolver(tag, path, kind)
|
|
Dumper.add_path_resolver(tag, path, kind)
|
|
|
|
def add_constructor(tag, constructor, Loader=Loader):
|
|
"""
|
|
Add a constructor for the given tag.
|
|
Constructor is a function that accepts a Loader instance
|
|
and a node object and produces the corresponding Python object.
|
|
"""
|
|
Loader.add_constructor(tag, constructor)
|
|
|
|
def add_multi_constructor(tag_prefix, multi_constructor, Loader=Loader):
|
|
"""
|
|
Add a multi-constructor for the given tag prefix.
|
|
Multi-constructor is called for a node if its tag starts with tag_prefix.
|
|
Multi-constructor accepts a Loader instance, a tag suffix,
|
|
and a node object and produces the corresponding Python object.
|
|
"""
|
|
Loader.add_multi_constructor(tag_prefix, multi_constructor)
|
|
|
|
def add_representer(data_type, representer, Dumper=Dumper):
|
|
"""
|
|
Add a representer for the given type.
|
|
Representer is a function accepting a Dumper instance
|
|
and an instance of the given data type
|
|
and producing the corresponding representation node.
|
|
"""
|
|
Dumper.add_representer(data_type, representer)
|
|
|
|
def add_multi_representer(data_type, multi_representer, Dumper=Dumper):
|
|
"""
|
|
Add a representer for the given type.
|
|
Multi-representer is a function accepting a Dumper instance
|
|
and an instance of the given data type or subtype
|
|
and producing the corresponding representation node.
|
|
"""
|
|
Dumper.add_multi_representer(data_type, multi_representer)
|
|
|
|
class YAMLObjectMetaclass(type):
|
|
"""
|
|
The metaclass for YAMLObject.
|
|
"""
|
|
def __init__(cls, name, bases, kwds):
|
|
super(YAMLObjectMetaclass, cls).__init__(name, bases, kwds)
|
|
if 'yaml_tag' in kwds and kwds['yaml_tag'] is not None:
|
|
cls.yaml_loader.add_constructor(cls.yaml_tag, cls.from_yaml)
|
|
cls.yaml_dumper.add_representer(cls, cls.to_yaml)
|
|
|
|
class YAMLObject(object):
|
|
"""
|
|
An object that can dump itself to a YAML stream
|
|
and load itself from a YAML stream.
|
|
"""
|
|
|
|
__metaclass__ = YAMLObjectMetaclass
|
|
__slots__ = () # no direct instantiation, so allow immutable subclasses
|
|
|
|
yaml_loader = Loader
|
|
yaml_dumper = Dumper
|
|
|
|
yaml_tag = None
|
|
yaml_flow_style = None
|
|
|
|
def from_yaml(cls, loader, node):
|
|
"""
|
|
Convert a representation node to a Python object.
|
|
"""
|
|
return loader.construct_yaml_object(node, cls)
|
|
from_yaml = classmethod(from_yaml)
|
|
|
|
def to_yaml(cls, dumper, data):
|
|
"""
|
|
Convert a Python object to a representation node.
|
|
"""
|
|
return dumper.represent_yaml_object(cls.yaml_tag, data, cls,
|
|
flow_style=cls.yaml_flow_style)
|
|
to_yaml = classmethod(to_yaml)
|
|
|