make wraparound() and boundscheck() available in pure mode

CHANGES.rst

@@ -27,6 +27,9 @@ Features added
 
 * The ``PyTypeObject`` declaration in ``cpython.object`` was extended.
 
+* ``wraparound()`` and ``boundscheck()`` are available as no-ops in pure
+  Python mode.
+
 * ``NULL`` is allowed as default argument when embedding signatures.
   This fixes ticket 843.
 

Cython/Shadow.py

@@ -97,7 +97,7 @@ class _EmptyDecoratorAndManager(object):
 
 cclass = ccall = cfunc = _EmptyDecoratorAndManager()
 
-returns = lambda type_arg: _EmptyDecoratorAndManager()
+returns = wraparound = boundscheck = lambda arg: _EmptyDecoratorAndManager()
 
 final = internal = type_version_tag = no_gc_clear = _empty_decorator
 

tests/run/pure_py.py

@@ -5,6 +5,7 @@ is_compiled = cython.compiled
 NULL = 5
 _NULL = NULL
 
+
 def test_sizeof():
     """
     >>> test_sizeof()
@@ -24,6 +25,7 @@ def test_sizeof():
     else:
         print(cython.sizeof(cython.char) == 1)
 
+
 def test_declare(n):
     """
     >>> test_declare(100)
@@ -43,6 +45,7 @@ def test_declare(n):
     ptr = cython.declare(cython.p_int, cython.address(y))
     return y, ptr[0]
 
+
 @cython.locals(x=cython.double, n=cython.int)
 def test_cast(x):
     """
@@ -52,6 +55,7 @@ def test_cast(x):
     n = cython.cast(cython.int, x)
     return n
 
+
 @cython.locals(x=cython.int, y=cython.p_int)
 def test_address(x):
     """
@@ -61,6 +65,30 @@ def test_address(x):
     y = cython.address(x)
     return y[0]
 
+
+@cython.wraparound(False)
+def test_wraparound(x):
+    """
+    >>> test_wraparound([1, 2, 3])
+    [1, 2, 1]
+    """
+    with cython.wraparound(True):
+        x[-1] = x[0]
+    return x
+
+
+@cython.boundscheck(False)
+def test_boundscheck(x):
+    """
+    >>> test_boundscheck([1, 2, 3])
+    3
+    >>> try: test_boundscheck([1, 2])
+    ... except IndexError: pass
+    """
+    with cython.boundscheck(True):
+        return x[2]
+
+
 ## CURRENTLY BROKEN - FIXME!!
 ## Is this test make sense? Implicit conversion in pure Python??
 
@@ -74,6 +102,7 @@ def test_address(x):
 ##     y = x
 ##     return y
 
+
 def test_with_nogil(nogil):
     """
     >>> raised = []