Add is_delegated() method to utils

src/dependency_injector/injections.pxd

@@ -3,8 +3,7 @@
 Cython optimized code.
 """
 
-cpdef tuple parse_positional_injections(tuple args)
-cpdef tuple parse_named_injections(dict kwargs)
+cimport cython
 
 
 cdef class Injection:
@@ -39,25 +38,44 @@ cdef class NamedInjection(Injection):
         return self.__value()
 
 
+@cython.boundscheck(False)
+@cython.wraparound(False)
 cdef inline tuple __provide_positional_args(tuple inj_args,
                                             int inj_args_len,
                                             tuple args):
+    cdef int index
+    cdef list positional_args
     cdef PositionalInjection injection
-    if inj_args_len > 0:
-        positional_args = list()
-        for index in range(inj_args_len):
-            injection = <PositionalInjection>inj_args[index]
-            positional_args.append(injection.get_value())
-        positional_args.extend(args)
-        args = positional_args
-    return args
 
+    if inj_args_len == 0:
+        return args
+
+    positional_args = list()
+    for index in range(inj_args_len):
+        injection = <PositionalInjection>inj_args[index]
+        positional_args.append(injection.get_value())
+    positional_args.extend(args)
+
+    return positional_args
+
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
 cdef inline dict __provide_keyword_args(tuple inj_kwargs,
                                         int inj_kwargs_len,
                                         dict kwargs):
+    cdef int index
     cdef NamedInjection kw_injection
-    if inj_kwargs_len > 0:
-        for index in range(inj_kwargs_len):
-            kw_injection = <NamedInjection>inj_kwargs[index]
-            kwargs[kw_injection.get_name()] = kw_injection.get_value()
+
+    if inj_kwargs_len == 0:
+        return kwargs
+
+    for index in range(inj_kwargs_len):
+        kw_injection = <NamedInjection>inj_kwargs[index]
+        kwargs[kw_injection.get_name()] = kw_injection.get_value()
+
     return kwargs
+
+
+cpdef tuple parse_positional_injections(tuple args)
+cpdef tuple parse_named_injections(dict kwargs)

src/dependency_injector/injections.pyx

@@ -3,8 +3,12 @@
 Cython optimized code.
 """
 
-# TODO: replace to cimport
-from .utils import is_provider
+cimport cython
+
+from .utils import (
+    is_provider,
+    is_delegated,
+)
 
 
 cdef class Injection:
@@ -18,13 +22,17 @@ cdef class PositionalInjection(Injection):
         """Initializer."""
         self.__value = value
         self.__is_provider = <int>is_provider(value)
-        self.__is_delegated = 0  # TODO: use utils.is_delegated()
+        self.__is_delegated = <int>is_delegated(value)
         self.__call = <int>self.__is_provider == 1 and self.__is_delegated == 0
 
     def get_value(self):
         """Return injection value."""
         return self.__get_value()
 
+    def get_original_value(self):
+        """Return original value."""
+        return self.__value
+
 
 cdef class NamedInjection(Injection):
     """Keyword injection class."""
@@ -34,7 +42,7 @@ cdef class NamedInjection(Injection):
         self.__name = name
         self.__value = value
         self.__is_provider = <int>is_provider(value)
-        self.__is_delegated = 0  # TODO: use utils.is_delegated()
+        self.__is_delegated = <int>is_delegated(value)
         self.__call = <int>self.__is_provider == 1 and self.__is_delegated == 0
 
     def get_name(self):
@@ -45,14 +53,20 @@ cdef class NamedInjection(Injection):
         """Return injection value."""
         return self.__get_value()
 
+    def get_original_value(self):
+        """Return original value."""
+        return self.__value
 
+
+@cython.boundscheck(False)
+@cython.wraparound(False)
 cpdef tuple parse_positional_injections(tuple args):
     """Parse positional injections."""
     cdef list injections = list()
     cdef int args_len = len(args)
 
-    cdef object arg
     cdef int index
+    cdef object arg
     cdef PositionalInjection injection
 
     for index in range(args_len):
@@ -63,6 +77,8 @@ cpdef tuple parse_positional_injections(tuple args):
     return tuple(injections)
 
 
+@cython.boundscheck(False)
+@cython.wraparound(False)
 cpdef tuple parse_named_injections(dict kwargs):
     """Parse named injections."""
     cdef list injections = list()

src/dependency_injector/utils.py

@@ -52,6 +52,19 @@ def ensure_is_provider(instance):
     return instance
 
 
+def is_delegated(instance):
+    """Check if instance is delegated provider.
+
+    :param instance: Instance to be checked.
+    :type instance: object
+
+    :rtype: bool
+    """
+    return (not isinstance(instance, six.class_types) and
+            hasattr(instance, '__IS_DELEGATED__') and
+            getattr(instance, '__IS_DELEGATED__') is True)
+
+
 def is_container(instance):
     """Check if instance is container instance.