# mode: run
# tag: cpp
# cython: c_string_encoding=ascii, c_string_type=unicode

cimport cython

from libcpp.string cimport string

b_asdf = b'asdf'
s_asdf = 'asdf'
u_asdf = u'asdf'
u_s = u's'


def test_conversion(py_obj):
    """
    >>> test_conversion(b_asdf) == u_asdf or test_conversion(b_asdf)
    True
    >>> test_conversion(u_asdf) == u_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) == u_asdf + u_s
    True
    >>> test_push_back(u_asdf) == u_asdf + u_s
    True
    """
    cdef string s = a
    s.push_back(<char>ord('s'))
    return s


def test_clear(a):
    """
    >>> test_clear(u_asdf) == u_s[:0]
    True
    >>> test_clear(b_asdf) == u_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
