kopia lustrzana https://github.com/inkstitch/inkstitch
86 wiersze
2.2 KiB
Python
86 wiersze
2.2 KiB
Python
import json
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import re
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from collections.abc import MutableMapping
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import inkex
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from lxml import etree
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from .utils.settings import DEFAULT_METADATA, global_settings
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def strip_namespace(tag):
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"""Remove xml namespace from a tag name.
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>>> {http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd}namedview
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<<< namedview
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"""
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match = re.match(r'^\{[^}]+\}(.+)$', tag)
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if match:
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return match.group(1)
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else:
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return tag
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class InkStitchMetadata(MutableMapping):
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"""Helper class to get and set inkstitch-specific metadata attributes.
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Operates on a document and acts like a dict. Setting an item adds or
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updates a metadata element in the document. Getting an item retrieves
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a metadata element's text contents or None if an element by that name
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doesn't exist.
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"""
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def __init__(self, document):
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super().__init__()
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self.document = document
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self.metadata = document.metadata
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for setting in DEFAULT_METADATA:
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if self[setting] is None:
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self[setting] = global_settings[f'default_{setting}']
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# Because this class inherints from MutableMapping, all we have to do is
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# implement these five methods and we get a full dict-like interface.
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def __setitem__(self, name, value):
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item = self._find_item(name)
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item.text = json.dumps(value)
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def _find_item(self, name, create=True):
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tag = inkex.addNS(name, "inkstitch")
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item = self.metadata.find(tag)
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if item is None and create:
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item = etree.SubElement(self.metadata, tag)
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return item
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def __getitem__(self, name):
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item = self._find_item(name)
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try:
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return json.loads(item.text)
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except (ValueError, TypeError):
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return None
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def __delitem__(self, name):
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item = self._find_item(name, create=False)
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if item is not None:
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self.metadata.remove(item)
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def __iter__(self):
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for child in self.metadata:
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if child.prefix == "inkstitch":
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yield strip_namespace(child.tag)
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def __len__(self):
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i = 0
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for i, item in enumerate(self):
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pass
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return i + 1
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def __json__(self):
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return dict(self)
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