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Diffstat (limited to '')
-rw-r--r-- | archivist/prefixes.py | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/archivist/prefixes.py b/archivist/prefixes.py new file mode 100644 index 0000000..4e73ca7 --- /dev/null +++ b/archivist/prefixes.py @@ -0,0 +1,69 @@ +from peewee import Field + +prefixes = {} +registered = False + +def register_prefixes(): + global registered + if registered: return + + if not prefixes: + _create_prefixes() + + for prefix in prefixes.values(): + prefix.get_or_create() + + registered = True + +def _create_prefixes(): + from .model import Document + + FieldPseudoPrefix('direction', 'In- or outgoing', Document.direction) + FieldPseudoPrefix('date', 'Date of creation', Document.created) + + for part in ('day', 'month', 'year'): + FieldPartPseudoPrefix(part, part.capitalize() + ' of creation', Document.created, part) + +def query_pseudo_prefix(prefix, value): + register_prefixes() + + if prefix in prefixes: + return prefixes[prefix].as_query(value) + return None + +class PseudoPrefix: + def __init__(self, name, description, accessor): + self.name = name + self.accessor = accessor + self.description = description + prefixes[name] = self + + def get_or_create(self): + from .model import Prefix + return Prefix.get_or_create(name = self.name, defaults={ + 'description' : self.description, + 'builtin' : True, + 'pseudo' : True}) + + def check_for(self, document, value): + return self.accessor(document) == value + + def as_query(self, value): + raise NotImplementedError + +class FieldPseudoPrefix(PseudoPrefix): + def __init__(self, name, description, field): + self._field = field + super().__init__(name, description, lambda doc: getattr(doc, field.name)) + + def as_query(self, value): + return self._field == value + +class FieldPartPseudoPrefix(PseudoPrefix): + def __init__(self, name, description, field, part): + self._field = field + self._field_part = getattr(field, part) + super().__init__(name, description, lambda doc: getattr(getattr(doc, field.name), part)) + + def as_query(self, value): + return self._field_part == value |