add missing std::string to str convertion helper

Cython/Utility/CppConvert.pyx

@@ -27,6 +27,7 @@ cdef extern from *:
     cdef object __Pyx_PyObject_FromStringAndSize(char*, size_t)
     cdef object __Pyx_PyBytes_FromStringAndSize(char*, size_t)
     cdef object __Pyx_PyByteArray_FromStringAndSize(char*, size_t)
+    cdef object __Pyx_PyStr_FromStringAndSize(char*, size_t)
     cdef object __Pyx_PyUnicode_FromStringAndSize(char*, size_t)
 
 @cname("{{cname}}")
@@ -37,6 +38,10 @@ cdef inline object {{cname}}(const string& s):
 cdef inline object {{cname.replace("PyObject", "PyUnicode", 1)}}(const string& s):
     return __Pyx_PyUnicode_FromStringAndSize(s.data(), s.size())
 
+@cname("{{cname.replace("PyObject", "PyStr", 1)}}")
+cdef inline object {{cname.replace("PyObject", "PyStr", 1)}}(const string& s):
+    return __Pyx_PyStr_FromStringAndSize(s.data(), s.size())
+
 @cname("{{cname.replace("PyObject", "PyBytes", 1)}}")
 cdef inline object {{cname.replace("PyObject", "PyBytes", 1)}}(const string& s):
     return __Pyx_PyBytes_FromStringAndSize(s.data(), s.size())

tests/run/cpp_stl_string_ascii_auto_encoding.pyx

@@ -7,11 +7,8 @@ cimport cython
 from libcpp.string cimport string
 
 b_asdf = b'asdf'
-b_asdg = b'asdg'
-b_s = b's'
-
+s_asdf = 'asdf'
 u_asdf = u'asdf'
-u_asdg = u'asdg'
 u_s = u's'
 
 
@@ -138,3 +135,16 @@ def test_unicode_cast(a):
     cdef string s = a
     assert s.length() == <size_t>len(a), "%d != %d" % (s.length(), len(a))
     return <unicode>s
+
+
+def test_str_cast(a):
+    """
+    >>> s = test_str_cast(b'abc')
+    >>> type(s) is type(s_asdf) or type(s)
+    True
+    >>> print(s)
+    abc
+    """
+    cdef string s = a
+    assert s.length() == <size_t>len(a), "%d != %d" % (s.length(), len(a))
+    return <str>s

tests/run/cpp_stl_string_ascii_auto_encoding_str.pyx

+# mode: run
+# tag: cpp
+# cython: c_string_encoding=ascii, c_string_type=str
+
+cimport cython
+
+from libcpp.string cimport string
+
+b_asdf = b'asdf'
+u_asdf = u'asdf'
+s_asdf = 'asdf'
+s_s = 's'
+
+
+def test_conversion(py_obj):
+    """
+    >>> test_conversion(b_asdf) == s_asdf or test_conversion(b_asdf)
+    True
+    >>> test_conversion(u_asdf) == s_asdf or test_conversion(u_asdf)
+    True
+    >>> test_conversion(123)  # doctest: +ELLIPSIS
+    Traceback (most recent call last):
+    TypeError: expected ..., int found
+    """
+    cdef string s = py_obj
+    assert <size_t>len(py_obj) == s.length(), '%d != %d' % (len(py_obj), s.length())
+    return s
+
+
+def test_empty(py_obj):
+    """
+    >>> test_empty('')
+    True
+    >>> test_empty('abc')
+    False
+    >>> test_empty(u_asdf[:0])
+    True
+    >>> test_empty(u_asdf)
+    False
+    """
+    cdef string a = py_obj
+    return a.empty()
+
+
+def test_push_back(a):
+    """
+    >>> test_push_back(b_asdf) == s_asdf + s_s
+    True
+    >>> test_push_back(u_asdf) == s_asdf + s_s
+    True
+    """
+    cdef string s = a
+    s.push_back(<char>ord('s'))
+    return s
+
+
+def test_clear(a):
+    """
+    >>> test_clear(u_asdf) == s_s[:0]
+    True
+    >>> test_clear(b_asdf) == s_s[:0]
+    True
+    """
+    cdef string s = a
+    s.clear()
+    return s
+
+
+def test_assign(char *a):
+    """
+    >>> test_assign(b_asdf) == 'ggg'
+    True
+    """
+    cdef string s = string(a)
+    s.assign(<char *>"ggg")
+    return s.c_str()
+
+
+def test_bytes_cast(a):
+    """
+    >>> b = test_bytes_cast(b'abc')
+    >>> isinstance(b, bytes)
+    True
+    >>> print(b.decode('ascii'))
+    abc
+    >>> b = test_bytes_cast(b'abc\\xe4\\xfc')
+    >>> isinstance(b, bytes)
+    True
+    >>> len(b)
+    5
+    >>> print(b[:3].decode('ascii'))
+    abc
+    >>> print(ord(b[3:4]))
+    228
+    >>> print(ord(b[4:5]))
+    252
+    """
+    cdef string s = a
+    assert s.length() == <size_t>len(a), "%d != %d" % (s.length(), len(a))
+    return <bytes>s
+
+
+def test_bytearray_cast(a):
+    """
+    >>> b = test_bytearray_cast(b'abc')
+    >>> isinstance(b, bytearray)
+    True
+    >>> print(b.decode('ascii'))
+    abc
+    >>> b = test_bytearray_cast(b'abc\\xe4\\xfc')
+    >>> isinstance(b, bytearray)
+    True
+    >>> len(b)
+    5
+    >>> print(b[:3].decode('ascii'))
+    abc
+    >>> print(ord(b[3:4]))
+    228
+    >>> print(ord(b[4:5]))
+    252
+    """
+    cdef string s = a
+    assert s.length() == <size_t>len(a), "%d != %d" % (s.length(), len(a))
+    return <bytearray>s
+
+
+def test_unicode_cast(a):
+    """
+    >>> u = test_unicode_cast(b'abc')
+    >>> type(u) is type(u_asdf) or type(u)
+    True
+    >>> print(u)
+    abc
+    """
+    cdef string s = a
+    assert s.length() == <size_t>len(a), "%d != %d" % (s.length(), len(a))
+    return <unicode>s
+
+
+def test_str_cast(a):
+    """
+    >>> s = test_str_cast(b'abc')
+    >>> type(s) is type(s_asdf) or type(s)
+    True
+    >>> print(s)
+    abc
+    """
+    cdef string s = a
+    assert s.length() == <size_t>len(a), "%d != %d" % (s.length(), len(a))
+    return <str>s