###################################################################
#  Numexpr - Fast numerical array expression evaluator for NumPy.
#
#      License: MIT
#      Author:  See AUTHORS.txt
#
#  See LICENSE.txt and LICENSES/*.txt for details about copyright and
#  rights to use.
####################################################################

import os
import sys
import platform
import warnings

import numpy
from numpy import (
    array, arange, empty, zeros, int32, int64, uint16, complex_, float64, rec,
    copy, ones_like, where, alltrue, linspace,
    sum, prod, sqrt, fmod,
    sin, cos, tan, arcsin, arccos, arctan, arctan2,
    sinh, cosh, tanh, arcsinh, arccosh, arctanh,
    log, log1p, log10, exp, expm1, conj)
from numpy.testing import (assert_equal, assert_array_equal,
    assert_array_almost_equal, assert_allclose)
from numpy import shape, allclose, array_equal, ravel, isnan, isinf

import numexpr
from numexpr import E, NumExpr, evaluate, disassemble, use_vml

import unittest
TestCase = unittest.TestCase

double = numpy.double


# Recommended minimum versions
minimum_numpy_version = "1.6"

class test_numexpr(TestCase):
    """Testing with 1 thread"""
    nthreads = 1

    def setUp(self):
        numexpr.set_num_threads(self.nthreads)

    def test_simple(self):
        ex = 2.0 * E.a + 3.0 * E.b * E.c
        sig = [('a', double), ('b', double), ('c', double)]
        func = NumExpr(ex, signature=sig)
        x = func(array([1., 2, 3]), array([4., 5, 6]), array([7., 8, 9]))
        assert_array_equal(x, array([  86.,  124.,  168.]))

    def test_simple_expr_small_array(self):
        func = NumExpr(E.a)
        x = arange(100.0)
        y = func(x)
        assert_array_equal(x, y)

    def test_simple_expr(self):
        func = NumExpr(E.a)
        x = arange(1e6)
        y = func(x)
        assert_array_equal(x, y)

    def test_rational_expr(self):
        func = NumExpr((E.a + 2.0*E.b) / (1 + E.a + 4*E.b*E.b))
        a = arange(1e6)
        b = arange(1e6) * 0.1
        x = (a + 2*b) / (1 + a + 4*b*b)
        y = func(a, b)
        assert_array_almost_equal(x, y)

    def test_reductions(self):
        # Check that they compile OK.
        assert_equal(disassemble(
            NumExpr("sum(x**2+2, axis=None)", [('x', double)])),
                     [(b'mul_ddd', b't3', b'r1[x]', b'r1[x]'),
                      (b'add_ddd', b't3', b't3', b'c2[2.0]'),
                      (b'sum_ddn', b'r0', b't3', None)])
        assert_equal(disassemble(
            NumExpr("sum(x**2+2, axis=1)", [('x', double)])),
                     [(b'mul_ddd', b't3', b'r1[x]', b'r1[x]'),
                      (b'add_ddd', b't3', b't3', b'c2[2.0]'),
                      (b'sum_ddn', b'r0', b't3', 1)])
        assert_equal(disassemble(
            NumExpr("prod(x**2+2, axis=2)", [('x', double)])),
                     [(b'mul_ddd', b't3', b'r1[x]', b'r1[x]'),
                      (b'add_ddd', b't3', b't3', b'c2[2.0]'),
                      (b'prod_ddn', b'r0', b't3', 2)])
        # Check that full reductions work.
        x = zeros(1e5)+.01   # checks issue #41
        assert_allclose(evaluate("sum(x+2,axis=None)"), sum(x+2,axis=None))
        assert_allclose(evaluate("sum(x+2,axis=0)"), sum(x+2,axis=0))
        assert_allclose(evaluate("prod(x,axis=0)"), prod(x,axis=0))

        x = arange(10.0)
        assert_allclose(evaluate("sum(x**2+2,axis=0)"), sum(x**2+2,axis=0))
        assert_allclose(evaluate("prod(x**2+2,axis=0)"), prod(x**2+2,axis=0))

        x = arange(100.0)
        assert_allclose(evaluate("sum(x**2+2,axis=0)"), sum(x**2+2,axis=0))
        assert_allclose(evaluate("prod(x-1,axis=0)"), prod(x-1,axis=0))
        x = linspace(0.1,1.0,2000)
        assert_allclose(evaluate("sum(x**2+2,axis=0)"), sum(x**2+2,axis=0))
        assert_allclose(evaluate("prod(x-1,axis=0)"), prod(x-1,axis=0))

        # Check that reductions along an axis work
        y = arange(9.0).reshape(3,3)
        assert_allclose(evaluate("sum(y**2, axis=1)"), sum(y**2, axis=1))
        assert_allclose(evaluate("sum(y**2, axis=0)"), sum(y**2, axis=0))
        assert_allclose(evaluate("sum(y**2, axis=None)"), sum(y**2, axis=None))
        assert_allclose(evaluate("prod(y**2, axis=1)"), prod(y**2, axis=1))
        assert_allclose(evaluate("prod(y**2, axis=0)"), prod(y**2, axis=0))
        assert_allclose(evaluate("prod(y**2, axis=None)"), prod(y**2, axis=None))
        # Check integers
        x = arange(10.)
        x = x.astype(int)
        assert_allclose(evaluate("sum(x**2+2,axis=0)"), sum(x**2+2,axis=0))
        assert_allclose(evaluate("prod(x**2+2,axis=0)"), prod(x**2+2,axis=0))
        # Check longs
        x = x.astype(long)
        assert_allclose(evaluate("sum(x**2+2,axis=0)"), sum(x**2+2,axis=0))
        assert_allclose(evaluate("prod(x**2+2,axis=0)"), prod(x**2+2,axis=0))
        # Check complex
        x = x + .1j
        assert_allclose(evaluate("sum(x**2+2,axis=0)"), sum(x**2+2,axis=0))
        assert_allclose(evaluate("prod(x-1,axis=0)"), prod(x-1,axis=0))

    def test_in_place(self):
        x = arange(10000.).reshape(1000,10)
        evaluate("x + 3", out=x)
        assert_equal(x, arange(10000.).reshape(1000,10) + 3)
        y = arange(10)
        evaluate("(x - 3) * y + (x - 3)", out=x)
        assert_equal(x, arange(10000.).reshape(1000,10) * (arange(10) + 1))

    def test_axis(self):
        y = arange(9.0).reshape(3,3)
        try:
            evaluate("sum(y, axis=2)")
        except ValueError:
            pass
        else:
            raise ValueError("should raise exception!")
        try:
            evaluate("sum(y, axis=-3)")
        except ValueError:
            pass
        else:
            raise ValueError("should raise exception!")
        try:
            # Negative axis are not supported
            evaluate("sum(y, axis=-1)")
        except ValueError:
            pass
        else:
            raise ValueError("should raise exception!")

    def test_r0_reuse(self):
        assert_equal(disassemble(NumExpr("x * x + 2", [('x', double)])),
                    [(b'mul_ddd', b'r0', b'r1[x]', b'r1[x]'),
                     (b'add_ddd', b'r0', b'r0', b'c2[2.0]')])


class test_numexpr2(test_numexpr):
    """Testing with 2 threads"""
    nthreads = 2


class test_evaluate(TestCase):
    def test_simple(self):
        a = array([1., 2., 3.])
        b = array([4., 5., 6.])
        c = array([7., 8., 9.])
        x = evaluate("2*a + 3*b*c")
        assert_array_equal(x, array([  86.,  124.,  168.]))

    def test_simple_expr_small_array(self):
        x = arange(100.0)
        y = evaluate("x")
        assert_array_equal(x, y)

    def test_simple_expr(self):
        x = arange(1e6)
        y = evaluate("x")
        assert_array_equal(x, y)

    # Test for issue #37
    if sys.version_info[0] < 3:
        # In python 3 '/' perforns true division, not integer division.
        # Integer division '//' is still not suppoerted by numexpr
        def test_zero_div(self):
            x = arange(100, dtype='i4')
            y = evaluate("1/x")
            x2 = zeros(100, dtype='i4')
            x2[1] = 1
            assert_array_equal(x2, y)

    # Test for issue #22
    def test_true_div(self):
        x = arange(10, dtype='i4')
        assert_array_equal(evaluate("x/2"), x / 2)
        assert_array_equal(evaluate("x/2", truediv=False), x / 2)
        assert_array_equal(evaluate("x/2", truediv='auto'), x / 2)
        assert_array_equal(evaluate("x/2", truediv=True), x / 2.0)

    # PyTables uses __nonzero__ among ExpressionNode objects internally
    # so this should be commented out for the moment.  See #24.
    def test_boolean_operator(self):
        x = arange(10, dtype='i4')
        try:
            evaluate("(x > 1) and (x < 9)")
        except TypeError:
            pass
        else:
            raise ValueError("should raise exception!")

    def test_rational_expr(self):
        a = arange(1e6)
        b = arange(1e6) * 0.1
        x = (a + 2*b) / (1 + a + 4*b*b)
        y = evaluate("(a + 2*b) / (1 + a + 4*b*b)")
        assert_array_almost_equal(x, y)

    def test_complex_expr(self):
        def complex(a, b):
            c = zeros(a.shape, dtype=complex_)
            c.real = a
            c.imag = b
            return c
        a = arange(1e4)
        b = arange(1e4)**1e-5
        z = a + 1j*b
        x = z.imag
        x = sin(complex(a, b)).real + z.imag
        y = evaluate("sin(complex(a, b)).real + z.imag")
        assert_array_almost_equal(x, y)

    def test_complex_strides(self):
        a = arange(100).reshape(10,10)[::2]
        b = arange(50).reshape(5,10)
        assert_array_equal(evaluate("a+b"), a+b)
        c = empty([10], dtype=[('c1', int32), ('c2', uint16)])
        c['c1'] = arange(10)
        c['c2'].fill(0xaaaa)
        c1 = c['c1']
        a0 = a[0]
        assert_array_equal(evaluate("c1"), c1)
        assert_array_equal(evaluate("a0+c1"), a0+c1)

    def test_broadcasting(self):
        a = arange(100).reshape(10,10)[::2]
        c = arange(10)
        d = arange(5).reshape(5,1)
        assert_array_equal(evaluate("a+c"), a+c)
        assert_array_equal(evaluate("a+d"), a+d)
        expr = NumExpr("2.0*a+3.0*c",[('a', double),('c', double)])
        assert_array_equal(expr(a,c), 2.0*a+3.0*c)

    def test_all_scalar(self):
        a = 3.
        b = 4.
        assert_allclose(evaluate("a+b"), a+b)
        expr = NumExpr("2*a+3*b",[('a', double),('b', double)])
        assert_equal(expr(a,b), 2*a+3*b)

    def test_run(self):
        a = arange(100).reshape(10,10)[::2]
        b = arange(10)
        expr = NumExpr("2*a+3*b",[('a', double),('b', double)])
        assert_array_equal(expr(a,b), expr.run(a,b))

    def test_illegal_value(self):
        a = arange(3)
        try:
            evaluate("a < [0, 0, 0]")
        except TypeError:
            pass
        else:
            self.fail()

    if 'sparc' not in platform.machine():
        # Execution order set here so as to not use too many threads
        # during the rest of the execution.  See #33 for details.
        def test_changing_nthreads_00_inc(self):
            a = linspace(-1, 1, 1e6)
            b = ((.25*a + .75)*a - 1.5)*a - 2
            for nthreads in range(1,7):
                numexpr.set_num_threads(nthreads)
                c = evaluate("((.25*a + .75)*a - 1.5)*a - 2")
                assert_array_almost_equal(b, c)

        def test_changing_nthreads_01_dec(self):
            a = linspace(-1, 1, 1e6)
            b = ((.25*a + .75)*a - 1.5)*a - 2
            for nthreads in range(6, 1, -1):
                numexpr.set_num_threads(nthreads)
                c = evaluate("((.25*a + .75)*a - 1.5)*a - 2")
                assert_array_almost_equal(b, c)


tests = [
('MISC', ['b*c+d*e',
          '2*a+3*b',
          '-a',
          'sinh(a)',
          '2*a + (cos(3)+5)*sinh(cos(b))',
          '2*a + arctan2(a, b)',
          'arcsin(0.5)',
          'where(a != 0.0, 2, a)',
          'where(a > 10, b < a, b > a)',
          'where((a-10).real != 0.0, a, 2)',
          '0.25 * (a < 5) + 0.33 * (a >= 5)',
          'cos(1+1)',
          '1+1',
          '1',
          'cos(a2)',
          ])]

optests = []
for op in list('+-*/%') + ['**']:
    optests.append("(a+1) %s (b+3)" % op)
    optests.append("3 %s (b+3)" % op)
    optests.append("(a+1) %s 4" % op)
    optests.append("2 %s (b+3)" % op)
    optests.append("(a+1) %s 2" % op)
    optests.append("(a+1) %s -1" % op)
    optests.append("(a+1) %s 0.5" % op)
    # Check divisions and modulus by zero (see ticket #107)
    optests.append("(a+1) %s 0" % op)
tests.append(('OPERATIONS', optests))

cmptests = []
for op in ['<', '<=', '==', '>=', '>', '!=']:
    cmptests.append("a/2+5 %s b" % op)
    cmptests.append("a/2+5 %s 7" % op)
    cmptests.append("7 %s b" % op)
    cmptests.append("7.0 %s 5" % op)
tests.append(('COMPARISONS', cmptests))

func1tests = []
for func in ['copy', 'ones_like', 'sqrt',
             'sin', 'cos', 'tan', 'arcsin', 'arccos', 'arctan',
             'sinh', 'cosh', 'tanh', 'arcsinh', 'arccosh', 'arctanh',
             'log', 'log1p', 'log10', 'exp', 'expm1', 'abs', 'conj']:
    func1tests.append("a + %s(b+c)" % func)
tests.append(('1_ARG_FUNCS', func1tests))

func2tests = []
for func in ['arctan2', 'fmod']:
    func2tests.append("a + %s(b+c, d+1)" % func)
    func2tests.append("a + %s(b+c, 1)" % func)
    func2tests.append("a + %s(1, d+1)" % func)
tests.append(('2_ARG_FUNCS', func2tests))

powtests = []
# n = -1, 0.5, 2, 4 already handled in section "OPERATIONS"
for n in (-7, -2.5, -1.5, -1.3, -.5, 0, 0.0, 1, 2.3, 2.5, 3):
    powtests.append("(a+1)**%s" % n)
tests.append(('POW_TESTS', powtests))

def equal(a, b, exact):
    if array_equal(a, b):
        return True

    if hasattr(a, 'dtype') and a.dtype in ['f4','f8']:
        nnans = isnan(a).sum()
        if nnans > 0:
            # For results containing NaNs, just check that the number
            # of NaNs is the same in both arrays.  This check could be
            # made more exhaustive, but checking element by element in
            # python space is very expensive in general.
            return nnans == isnan(b).sum()
        ninfs = isinf(a).sum()
        if ninfs > 0:
            # Ditto for Inf's
            return ninfs == isinf(b).sum()
    if exact:
        return (shape(a) == shape(b)) and alltrue(ravel(a) == ravel(b), axis=0)
    else:
        if hasattr(a, 'dtype') and a.dtype == 'f4':
            atol = 1e-5   # Relax precission for special opcodes, like fmod
        else:
            atol = 1e-8
        return (shape(a) == shape(b) and
                allclose(ravel(a), ravel(b), atol=atol))

class Skip(Exception): pass

def test_expressions():
    test_no = [0]
    def make_test_method(a, a2, b, c, d, e, x, expr,
                         test_scalar, dtype, optimization, exact, section):
        this_locals = locals()
        def method():
            # We don't want to listen at RuntimeWarnings like
            # "overflows" or "divide by zero" in plain eval().
            warnings.simplefilter("ignore")
            npval = eval(expr, globals(), this_locals)
            warnings.simplefilter("always")
            npval = eval(expr, globals(), this_locals)
            try:
                neval = evaluate(expr, local_dict=this_locals,
                                 optimization=optimization)
                assert equal(npval, neval, exact), """%r
(test_scalar=%r, dtype=%r, optimization=%r, exact=%r,
 npval=%r (%r - %r)\n neval=%r (%r - %r))""" % (expr, test_scalar, dtype.__name__,
                                     optimization, exact,
                                     npval, type(npval), shape(npval),
                                     neval, type(neval), shape(neval))
            except AssertionError:
                raise
            except NotImplementedError:
                print('%r not implemented for %s (scalar=%d, opt=%s)'
                      % (expr, dtype.__name__, test_scalar, optimization))
            except:
                print('numexpr error for expression %r' % (expr,))
                raise
        method.description = ('test_expressions(%s, test_scalar=%r, '
                              'dtype=%r, optimization=%r, exact=%r)') \
                    % (expr, test_scalar, dtype.__name__, optimization, exact)
        test_no[0] += 1
        method.__name__ = 'test_scalar%d_%s_%s_%s_%04d' % (test_scalar,
                                                           dtype.__name__,
                                                           optimization.encode('ascii'),
                                                           section.encode('ascii'),
                                                           test_no[0])
        return method
    x = None
    for test_scalar in (0, 1, 2):
        for dtype in (int, long, numpy.float32, double, complex):
            array_size = 100
            a = arange(2*array_size, dtype=dtype)[::2]
            a2 = zeros([array_size, array_size], dtype=dtype)
            b = arange(array_size, dtype=dtype) / array_size
            c = arange(array_size, dtype=dtype)
            d = arange(array_size, dtype=dtype)
            e = arange(array_size, dtype=dtype)
            if dtype == complex:
                a = a.real
                for x in [a2, b, c, d, e]:
                    x += 1j
                    x *= 1+1j
            if test_scalar == 1:
                a = a[array_size // 2]
            if test_scalar == 2:
                b = b[array_size // 2]
            for optimization, exact in [
                ('none', False), ('moderate', False), ('aggressive', False)]:
                for section_name, section_tests in tests:
                    for expr in section_tests:
                        if dtype == complex and (
                               '<' in expr or '>' in expr or '%' in expr
                               or "arctan2" in expr or "fmod" in expr):
                            # skip complex comparisons or functions not
                            # defined in complex domain.
                            continue
                        if (dtype in (int, long) and test_scalar and
                            expr == '(a+1) ** -1'):
                            continue

                        m = make_test_method(a, a2, b, c, d, e, x,
                                             expr, test_scalar, dtype,
                                             optimization, exact,
                                             section_name)
                        yield m

class test_int64(TestCase):
    def test_neg(self):
        a = array([2**31-1, 2**31, 2**32, 2**63-1], dtype=int64)
        res = evaluate('-a')
        assert_array_equal(res, [1-2**31, -(2**31), -(2**32), 1-2**63])
        self.assertEqual(res.dtype.name, 'int64')

class test_int32_int64(TestCase):
    if sys.version_info[0] < 2:
        # no long literals in python 3
        def test_small_long(self):
            # Small longs should not be downgraded to ints.
            res = evaluate('42L')
            assert_array_equal(res, 42)
            self.assertEqual(res.dtype.name, 'int64')

    def test_small_int(self):
        # Small ints (32-bit ones) should not be promoted to longs.
        res = evaluate('2')
        assert_array_equal(res, 2)
        self.assertEqual(res.dtype.name, 'int32')

    def test_big_int(self):
        # Big ints should be promoted to longs.
        res = evaluate('2**40')
        assert_array_equal(res, 2**40)
        self.assertEqual(res.dtype.name, 'int64')

    def test_long_constant_promotion(self):
        int32array = arange(100, dtype='int32')
        itwo = numpy.int32(2)
        ltwo = numpy.int64(2)
        res = int32array * 2
        res32 = evaluate('int32array * itwo')
        res64 = evaluate('int32array * ltwo')
        assert_array_equal(res, res32)
        assert_array_equal(res, res64)
        self.assertEqual(res32.dtype.name, 'int32')
        self.assertEqual(res64.dtype.name, 'int64')

    def test_int64_array_promotion(self):
        int32array = arange(100, dtype='int32')
        int64array = arange(100, dtype='int64')
        respy = int32array * int64array
        resnx = evaluate('int32array * int64array')
        assert_array_equal(respy, resnx)
        self.assertEqual(resnx.dtype.name, 'int64')


class test_uint32_int64(TestCase):
    def test_small_uint32(self):
        # Small uint32 should not be downgraded to ints.
        a = numpy.uint32(42)
        res = evaluate('a')
        assert_array_equal(res, 42)
        self.assertEqual(res.dtype.name, 'int64')

    def test_uint32_constant_promotion(self):
        int32array = arange(100, dtype='int32')
        stwo = numpy.int32(2)
        utwo = numpy.uint32(2)
        res = int32array * utwo
        res32 = evaluate('int32array * stwo')
        res64 = evaluate('int32array * utwo')
        assert_array_equal(res, res32)
        assert_array_equal(res, res64)
        self.assertEqual(res32.dtype.name, 'int32')
        self.assertEqual(res64.dtype.name, 'int64')

    def test_int64_array_promotion(self):
        uint32array = arange(100, dtype='uint32')
        int64array = arange(100, dtype='int64')
        respy = uint32array * int64array
        resnx = evaluate('uint32array * int64array')
        assert_array_equal(respy, resnx)
        self.assertEqual(resnx.dtype.name, 'int64')


class test_strings(TestCase):
    BLOCK_SIZE1 = 128
    BLOCK_SIZE2 = 8
    str_list1 = [b'foo', b'bar', b'', b'  ']
    str_list2 = [b'foo', b'', b'x', b' ']
    str_nloops = len(str_list1) * (BLOCK_SIZE1 + BLOCK_SIZE2 + 1)
    str_array1 = array(str_list1 * str_nloops)
    str_array2 = array(str_list2 * str_nloops)
    str_constant = b'doodoo'

    def test_null_chars(self):
        str_list = [
            b'\0\0\0', b'\0\0foo\0', b'\0\0foo\0b', b'\0\0foo\0b\0',
            b'foo\0', b'foo\0b', b'foo\0b\0', b'foo\0bar\0baz\0\0' ]
        for s in str_list:
            r = evaluate('s')
            self.assertEqual(s, r.tostring())  # check *all* stored data

    def test_compare_copy(self):
        sarr = self.str_array1
        expr = 'sarr'
        res1 = eval(expr)
        res2 = evaluate(expr)
        assert_array_equal(res1, res2)

    def test_compare_array(self):
        sarr1 = self.str_array1
        sarr2 = self.str_array2
        expr = 'sarr1 >= sarr2'
        res1 = eval(expr)
        res2 = evaluate(expr)
        assert_array_equal(res1, res2)

    def test_compare_variable(self):
        sarr = self.str_array1
        svar = self.str_constant
        expr = 'sarr >= svar'
        res1 = eval(expr)
        res2 = evaluate(expr)
        assert_array_equal(res1, res2)

    def test_compare_constant(self):
        sarr = self.str_array1
        expr = 'sarr >= %r' % self.str_constant
        res1 = eval(expr)
        res2 = evaluate(expr)
        assert_array_equal(res1, res2)

    def test_add_string_array(self):
        sarr1 = self.str_array1
        sarr2 = self.str_array2
        expr = 'sarr1 + sarr2'
        self.assert_missing_op('add_sss', expr, locals())

    def test_add_numeric_array(self):
        sarr = self.str_array1
        narr = arange(len(sarr), dtype='int32')
        expr = 'sarr >= narr'
        self.assert_missing_op('ge_bsi', expr, locals())

    def assert_missing_op(self, op, expr, local_dict):
        msg = "expected NotImplementedError regarding '%s'" % op
        try:
            evaluate(expr, local_dict)
        except NotImplementedError, nie:
            if "'%s'" % op not in nie.args[0]:
                self.fail(msg)
        else:
            self.fail(msg)

    def test_compare_prefix(self):
        # Check comparing two strings where one is a prefix of the
        # other.
        for s1, s2 in [ (b'foo', b'foobar'), (b'foo', b'foo\0bar'),
                        (b'foo\0a', b'foo\0bar') ]:
            self.assertTrue(evaluate('s1 < s2'))
            self.assertTrue(evaluate('s1 <= s2'))
            self.assertTrue(evaluate('~(s1 == s2)'))
            self.assertTrue(evaluate('~(s1 >= s2)'))
            self.assertTrue(evaluate('~(s1 > s2)'))

        # Check for NumPy array-style semantics in string equality.
        s1, s2 = b'foo', b'foo\0\0'
        self.assertTrue(evaluate('s1 == s2'))

# Case for testing selections in fields which are aligned but whose
# data length is not an exact multiple of the length of the record.
# The following test exposes the problem only in 32-bit machines,
# because in 64-bit machines 'c2' is unaligned.  However, this should
# check most platforms where, while not unaligned, 'len(datatype) >
# boundary_alignment' is fullfilled.
class test_irregular_stride(TestCase):
    def test_select(self):
        f0 = arange(10, dtype=int32)
        f1 = arange(10, dtype=float64)

        irregular = rec.fromarrays([f0, f1])

        f0 = irregular['f0']
        f1 = irregular['f1']

        i0 = evaluate('f0 < 5')
        i1 = evaluate('f1 < 5')

        assert_array_equal(f0[i0], arange(5, dtype=int32))
        assert_array_equal(f1[i1], arange(5, dtype=float64))

# Cases for testing arrays with dimensions that can be zero.
class test_zerodim(TestCase):

    def test_zerodim1d(self):
        a0 = array([], dtype=int32)
        a1 = array([], dtype=float64)

        r0 = evaluate('a0 + a1')
        r1 = evaluate('a0 * a1')

        assert_array_equal(r0, a1)
        assert_array_equal(r1, a1)

    def test_zerodim3d(self):
        a0 = array([], dtype=int32).reshape(0,2,4)
        a1 = array([], dtype=float64).reshape(0,2,4)

        r0 = evaluate('a0 + a1')
        r1 = evaluate('a0 * a1')

        assert_array_equal(r0, a1)
        assert_array_equal(r1, a1)

# Case test for threads
class test_threading(TestCase):
    def test_thread(self):
        import threading
        class ThreadTest(threading.Thread):
            def run(self):
                a = arange(3)
                assert_array_equal(evaluate('a**3'), array([0, 1, 8]))
        test = ThreadTest()
        test.start()

# The worker function for the subprocess (needs to be here because Windows
# has problems pickling nested functions with the multiprocess module :-/)
def _worker(qout = None):
    ra = numpy.arange(1e3)
    rows = evaluate('ra > 0')
    #print "Succeeded in evaluation!\n"
    if qout is not None:
        qout.put("Done")

# Case test for subprocesses (via multiprocessing module)
class test_subprocess(TestCase):
    def test_multiprocess(self):
        try:
            import multiprocessing as mp
        except ImportError:
            return
        # Check for two threads at least
        numexpr.set_num_threads(2)
        #print "**** Running from main process:"
        _worker()
        #print "**** Running from subprocess:"
        qout = mp.Queue()
        ps = mp.Process(target=_worker, args=(qout,))
        ps.daemon = True
        ps.start()

        result = qout.get()
        #print result




def print_versions():
    """Print the versions of software that numexpr relies on."""
    if numpy.__version__ < minimum_numpy_version:
        print "*Warning*: NumPy version is lower than recommended: %s < %s" % \
              (numpy.__version__, minimum_numpy_version)
    print '-=' * 38
    print "Numexpr version:   %s" % numexpr.__version__
    print "NumPy version:     %s" % numpy.__version__
    print 'Python version:    %s' % sys.version
    if os.name == 'posix':
        (sysname, nodename, release, version, machine) = os.uname()
        print 'Platform:          %s-%s' % (sys.platform, machine)
    print "AMD/Intel CPU?     %s" % numexpr.is_cpu_amd_intel
    print "VML available?     %s" % use_vml
    if use_vml:
        print "VML/MKL version:   %s" % numexpr.get_vml_version()
    print ("Number of threads used by default: %d "
           "(out of %d detected cores)" % (numexpr.nthreads, numexpr.ncores))
    print '-=' * 38


def test():
    """
    Run all the tests in the test suite.
    """

    print_versions()
    return unittest.TextTestRunner().run(suite())
test.__test__ = False


def suite():
    import unittest
    import platform as pl

    theSuite = unittest.TestSuite()
    niter = 1

    class TestExpressions(TestCase):
        pass

    def add_method(func):
        def method(self):
            return func()
        setattr(TestExpressions, func.__name__,
                method.__get__(None, TestExpressions))

    for func in test_expressions():
        add_method(func)

    for n in range(niter):
        theSuite.addTest(unittest.makeSuite(test_numexpr))
        if 'sparc' not in platform.machine():
            theSuite.addTest(unittest.makeSuite(test_numexpr2))
        theSuite.addTest(unittest.makeSuite(test_evaluate))
        theSuite.addTest(unittest.makeSuite(TestExpressions))
        theSuite.addTest(unittest.makeSuite(test_int32_int64))
        theSuite.addTest(unittest.makeSuite(test_uint32_int64))
        theSuite.addTest(unittest.makeSuite(test_strings))
        theSuite.addTest(
            unittest.makeSuite(test_irregular_stride) )
        theSuite.addTest(unittest.makeSuite(test_zerodim))

        # multiprocessing module is not supported on Hurd/kFreeBSD
        if (pl.system().lower() not in ('gnu', 'gnu/kfreebsd')):
            theSuite.addTest(unittest.makeSuite(test_subprocess))

        # I need to put this test after test_subprocess because
        # if not, the test suite locks immediately before test_subproces.
        # This only happens with Windows, so I suspect of a subtle bad
        # interaction with threads and subprocess :-/
        theSuite.addTest(unittest.makeSuite(test_threading))

    return theSuite

if __name__ == '__main__':
    print_versions()
    unittest.main(defaultTest = 'suite')
#    suite = suite()
#    unittest.TextTestRunner(verbosity=2).run(suite)
