Web-based check-in interface (#1985)

src/pretix/helpers/jsonlogic_query.py

@@ -0,0 +1,59 @@
+import logging
+from datetime import timedelta
+
+from django.db.models import Func, Value
+
+logger = logging.getLogger(__name__)
+
+
+class Equal(Func):
+    arg_joiner = ' = '
+    arity = 2
+    function = ''
+
+
+class GreaterThan(Func):
+    arg_joiner = ' > '
+    arity = 2
+    function = ''
+
+
+class GreaterEqualThan(Func):
+    arg_joiner = ' >= '
+    arity = 2
+    function = ''
+
+
+class LowerEqualThan(Func):
+    arg_joiner = ' < '
+    arity = 2
+    function = ''
+
+
+class LowerThan(Func):
+    arg_joiner = ' < '
+    arity = 2
+    function = ''
+
+
+class InList(Func):
+    arity = 2
+
+    def as_sql(self, compiler, connection, function=None, template=None, arg_joiner=None, **extra_context):
+        connection.ops.check_expression_support(self)
+
+        # This ignores the special case for databases which limit the number of
+        # elements which can appear in an 'IN' clause, which hopefully is only Oracle.
+        lhs, lhs_params = compiler.compile(self.source_expressions[0])
+
+        if not isinstance(self.source_expressions[1], Value) and not isinstance(self.source_expressions[1].value, (list, tuple)):
+            raise TypeError(f'Dynamic right-hand-site currently not implemented, found {type(self.source_expressions[1])}')
+        rhs, rhs_params = ['%s' for _ in self.source_expressions[1].value], [d for d in self.source_expressions[1].value]
+
+        return '%s IN (%s)' % (lhs, ', '.join(rhs)), lhs_params + rhs_params
+
+
+def tolerance(b, tol=None, sign=1):
+    if tol:
+        return b + timedelta(minutes=sign * float(tol))
+    return b