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from ... import types as sqltypes class JSON(sqltypes.JSON): """SQLite JSON type. SQLite supports JSON as of version 3.9 through its JSON1_ extension. Note that JSON1_ is a `loadable extension <https://www.sqlite.org/loadext.html>`_ and as such may not be available, or may require run-time loading. The :class:`_sqlite.JSON` type supports persistence of JSON values as well as the core index operations provided by :class:`_types.JSON` datatype, by adapting the operations to render the ``JSON_EXTRACT`` function wrapped in the ``JSON_QUOTE`` function at the database level. Extracted values are quoted in order to ensure that the results are always JSON string values. .. versionadded:: 1.3 .. seealso:: JSON1_ .. _JSON1: https://www.sqlite.org/json1.html """ # Note: these objects currently match exactly those of MySQL, however since # these are not generalizable to all JSON implementations, remain separately # implemented for each dialect. class _FormatTypeMixin(object): def _format_value(self, value): raise NotImplementedError() def bind_processor(self, dialect): super_proc = self.string_bind_processor(dialect) def process(value): value = self._format_value(value) if super_proc: value = super_proc(value) return value return process def literal_processor(self, dialect): super_proc = self.string_literal_processor(dialect) def process(value): value = self._format_value(value) if super_proc: value = super_proc(value) return value return process class JSONIndexType(_FormatTypeMixin, sqltypes.JSON.JSONIndexType): def _format_value(self, value): if isinstance(value, int): value = "$[%s]" % value else: value = '$."%s"' % value return value class JSONPathType(_FormatTypeMixin, sqltypes.JSON.JSONPathType): def _format_value(self, value): return "$%s" % ( "".join( [ "[%s]" % elem if isinstance(elem, int) else '."%s"' % elem for elem in value ] ) )