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"""Module containing various interfaces."""
from abc import ABCMeta, abstractmethod, abstractclassmethod
import xml.etree.ElementTree as et
class XMLSerializable(metaclass=ABCMeta):
"""Interface for XML-serializable Workspace components."""
@staticmethod
def int_or_none(v):
if v is None:
return None
try:
v = int(v)
except (ValueError, TypeError):
return None
return v
@staticmethod
def indent(elem, indent=4, level=0):
"""Pretty-indent the XML tree."""
i = "\n" + level*(indent*' ')
if len(elem) > 0:
if not elem.text or not elem.text.strip():
elem.text = i + (' '*indent)
if not elem.tail or not elem.tail.strip():
elem.tail = i
for elem in elem:
XMLSerializable.indent(elem, indent=indent, level=level+1)
if not elem.tail or not elem.tail.strip():
elem.tail = i
else:
if level and (not elem.tail or not elem.tail.strip()):
elem.tail = i
@abstractmethod
def serialize(self) -> et.Element:
"""Serialize the object into an XML element."""
@abstractclassmethod
def deserialize(cls, w: "Workspace", e: et.Element):
"""Deserialize the object from an XML element.
This function may assume that all dependencies have already been loaded into the
passed workspace.
"""
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