from io import StringIO import abc import numpy as np import yaml class NiceDumper(yaml.SafeDumper): """Make YAML readable for humans.""" def write_line_break(self, data=None): super().write_line_break(data) if len(self.indents) == 1: super().write_line_break() def increase_indent(self, flow=False, indentless=False): return super().increase_indent(flow, False) def represent_data(self, data): """Cast Config objects and its subclasses to dict.""" return self.represent_data(dict(data)) if isinstance(data, dict) and type(data) != dict else \ super().represent_data(data) def ignore_aliases(self, data): """No references.""" return True class Config(dict): """YAML-based configuration.""" def __repr__(self): """Show as in file.""" output = StringIO() self.save(output) output.seek(0) return ''.join(output.readlines()) @classmethod def load(cls,fname): """ Load from yaml file. Parameters ---------- fname : file, str, or pathlib.Path Filename or file for writing. """ try: fhandle = open(fname) except TypeError: fhandle = fname return cls(yaml.safe_load(fhandle)) def save(self,fname,**kwargs): """ Save to yaml file. Parameters ---------- fname : file, str, or pathlib.Path Filename or file for writing. **kwargs : dict Keyword arguments parsed to yaml.dump. """ try: fhandle = open(fname,'w') except TypeError: fhandle = fname if 'width' not in kwargs: kwargs['width'] = 256 if 'default_flow_style' not in kwargs: kwargs['default_flow_style'] = None if 'sort_keys' not in kwargs: kwargs['sort_keys'] = False def array_representer(dumper, data): """Convert numpy array to list of native types.""" return dumper.represent_list([d.item() for d in data]) NiceDumper.add_representer(np.ndarray, array_representer) try: fhandle.write(yaml.dump(self,Dumper=NiceDumper,**kwargs)) except TypeError: # compatibility with old pyyaml del kwargs['sort_keys'] fhandle.write(yaml.dump(self,Dumper=NiceDumper,**kwargs)) @property @abc.abstractmethod def is_complete(self): """Check for completeness.""" pass @property @abc.abstractmethod def is_valid(self): """Check for valid file layout.""" pass