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""" Tablib - YAML Support.
"""
import tablib
import yaml
class YAMLFormat:
title = 'yaml'
extensions = ('yaml', 'yml')
@classmethod
def export_set(cls, dataset):
"""Returns YAML representation of Dataset."""
return yaml.safe_dump(dataset._package(ordered=False), default_flow_style=None)
@classmethod
def export_book(cls, databook):
"""Returns YAML representation of Databook."""
return yaml.safe_dump(databook._package(ordered=False), default_flow_style=None)
@classmethod
def import_set(cls, dset, in_stream):
"""Returns dataset from YAML stream."""
dset.wipe()
dset.dict = yaml.safe_load(in_stream)
@classmethod
def import_book(cls, dbook, in_stream):
"""Returns databook from YAML stream."""
dbook.wipe()
for sheet in yaml.safe_load(in_stream):
data = tablib.Dataset()
data.title = sheet['title']
data.dict = sheet['data']
dbook.add_sheet(data)
@classmethod
def detect(cls, stream):
"""Returns True if given stream is valid YAML."""
try:
_yaml = yaml.safe_load(stream)
if isinstance(_yaml, (list, tuple, dict)):
return True
else:
return False
except (yaml.parser.ParserError, yaml.reader.ReaderError,
yaml.scanner.ScannerError):
return False
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