#-*- coding: ISO-8859-1 -*-

# pysqlite2/test/hooks.py: tests for various SQLite-specific hooks

#

# Copyright (C) 2006 Gerhard Häring <gh@ghaering.de>

#

# This file is part of pysqlite.

#

# This software is provided 'as-is', without any express or implied

# warranty.  In no event will the authors be held liable for any damages

# arising from the use of this software.

#

# Permission is granted to anyone to use this software for any purpose,

# including commercial applications, and to alter it and redistribute it

# freely, subject to the following restrictions:

#

# 1. The origin of this software must not be misrepresented; you must not

#    claim that you wrote the original software. If you use this software

#    in a product, an acknowledgment in the product documentation would be

#    appreciated but is not required.

# 2. Altered source versions must be plainly marked as such, and must not be

#    misrepresented as being the original software.

# 3. This notice may not be removed or altered from any source distribution.

import os, unittest

import sqlite3 as sqlite

class CollationTests(unittest.TestCase):

    def setUp(self):

        pass

    def tearDown(self):

        pass

    def CheckCreateCollationNotCallable(self):

        con = sqlite.connect(":memory:")

        try:

            con.create_collation("X", 42)

            self.fail("should have raised a TypeError")

        except TypeError, e:

            self.failUnlessEqual(e.args[0], "parameter must be callable")

    def CheckCreateCollationNotAscii(self):

        con = sqlite.connect(":memory:")

        try:

            con.create_collation("collä", cmp)

            self.fail("should have raised a ProgrammingError")

        except sqlite.ProgrammingError, e:

            pass

    def CheckCollationIsUsed(self):

        if sqlite.version_info < (3, 2, 1):  # old SQLite versions crash on this test

            return

        def mycoll(x, y):

            # reverse order

            return -cmp(x, y)

        con = sqlite.connect(":memory:")

        con.create_collation("mycoll", mycoll)

        sql = """

            select x from (

            select 'a' as x

            union

            select 'b' as x

            union

            select 'c' as x

            ) order by x collate mycoll

            """

        result = con.execute(sql).fetchall()

        if result[0][0] != "c" or result[1][0] != "b" or result[2][0] != "a":

            self.fail("the expected order was not returned")

        con.create_collation("mycoll", None)

        try:

            result = con.execute(sql).fetchall()

            self.fail("should have raised an OperationalError")

        except sqlite.OperationalError, e:

            self.failUnlessEqual(e.args[0].lower(), "no such collation sequence: mycoll")

    def CheckCollationRegisterTwice(self):

        """

        Register two different collation functions under the same name.

        Verify that the last one is actually used.

        """

        con = sqlite.connect(":memory:")

        con.create_collation("mycoll", cmp)

        con.create_collation("mycoll", lambda x, y: -cmp(x, y))

        result = con.execute("""

            select x from (select 'a' as x union select 'b' as x) order by x collate mycoll

            """).fetchall()

        if result[0][0] != 'b' or result[1][0] != 'a':

            self.fail("wrong collation function is used")

    def CheckDeregisterCollation(self):

        """

        Register a collation, then deregister it. Make sure an error is raised if we try

        to use it.

        """

        con = sqlite.connect(":memory:")

        con.create_collation("mycoll", cmp)

        con.create_collation("mycoll", None)

        try:

            con.execute("select 'a' as x union select 'b' as x order by x collate mycoll")

            self.fail("should have raised an OperationalError")

        except sqlite.OperationalError, e:

            if not e.args[0].startswith("no such collation sequence"):

                self.fail("wrong OperationalError raised")

def suite():

    collation_suite = unittest.makeSuite(CollationTests, "Check")

    return unittest.TestSuite((collation_suite,))

def test():

    runner = unittest.TextTestRunner()

    runner.run(suite())

if __name__ == "__main__":

    test()