from __future__ import absolute_import

import unittest

from mercurial import error, mdiff

# for readability, line numbers are 0-origin

text1 = b'''

           00 at OLD

           01 at OLD

           02 at OLD

02 at NEW, 03 at OLD

03 at NEW, 04 at OLD

04 at NEW, 05 at OLD

05 at NEW, 06 at OLD

           07 at OLD

           08 at OLD

           09 at OLD

           10 at OLD

           11 at OLD

'''[1:] # strip initial LF

text2 = b'''

00 at NEW

01 at NEW

02 at NEW, 03 at OLD

03 at NEW, 04 at OLD

04 at NEW, 05 at OLD

05 at NEW, 06 at OLD

06 at NEW

07 at NEW

08 at NEW

09 at NEW

10 at NEW

11 at NEW

'''[1:] # strip initial LF

def filteredblocks(blocks, rangeb):

    """return `rangea` extracted from `blocks` coming from

    `mdiff.blocksinrange` along with the mask of blocks within rangeb.

    """

    filtered, rangea = mdiff.blocksinrange(blocks, rangeb)

    skipped = [b not in filtered for b in blocks]

    return rangea, skipped

class blocksinrangetests(unittest.TestCase):

    def setUp(self):

        self.blocks = list(mdiff.allblocks(text1, text2))

        assert self.blocks == [

            ([0, 3, 0, 2], b'!'),

            ((3, 7, 2, 6), b'='),

            ([7, 12, 6, 12], b'!'),

            ((12, 12, 12, 12), b'='),

        ], self.blocks

    def testWithinEqual(self):

        """linerange within an "=" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #        ^^

        linerange2 = (3, 5)

        linerange1, skipped = filteredblocks(self.blocks, linerange2)

        self.assertEqual(linerange1, (4, 6))

        self.assertEqual(skipped, [True, False, True, True])

    def testWithinEqualStrictly(self):

        """linerange matching exactly an "=" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #       ^^^^

        linerange2 = (2, 6)

        linerange1, skipped = filteredblocks(self.blocks, linerange2)

        self.assertEqual(linerange1, (3, 7))

        self.assertEqual(skipped, [True, False, True, True])

    def testWithinEqualLowerbound(self):

        """linerange at beginning of an "=" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #       ^^

        linerange2 = (2, 4)

        linerange1, skipped = filteredblocks(self.blocks, linerange2)

        self.assertEqual(linerange1, (3, 5))

        self.assertEqual(skipped, [True, False, True, True])

    def testWithinEqualLowerboundOneline(self):

        """oneline-linerange at beginning of an "=" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #       ^

        linerange2 = (2, 3)

        linerange1, skipped = filteredblocks(self.blocks, linerange2)

        self.assertEqual(linerange1, (3, 4))

        self.assertEqual(skipped, [True, False, True, True])

    def testWithinEqualUpperbound(self):

        """linerange at end of an "=" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #        ^^^

        linerange2 = (3, 6)

        linerange1, skipped = filteredblocks(self.blocks, linerange2)

        self.assertEqual(linerange1, (4, 7))

        self.assertEqual(skipped, [True, False, True, True])

    def testWithinEqualUpperboundOneLine(self):

        """oneline-linerange at end of an "=" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #          ^

        linerange2 = (5, 6)

        linerange1, skipped = filteredblocks(self.blocks, linerange2)

        self.assertEqual(linerange1, (6, 7))

        self.assertEqual(skipped, [True, False, True, True])

    def testWithinFirstBlockNeq(self):

        """linerange within the first "!" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #     ^

        #      |           (empty)

        #      ^

        #     ^^

        for linerange2 in [

            (0, 1),

            (1, 1),

            (1, 2),

            (0, 2),

        ]:

            linerange1, skipped = filteredblocks(self.blocks, linerange2)

            self.assertEqual(linerange1, (0, 3))

            self.assertEqual(skipped, [False, True, True, True])

    def testWithinLastBlockNeq(self):

        """linerange within the last "!" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #           ^

        #            ^

        #           |      (empty)

        #           ^^^^^^

        #                ^

        for linerange2 in [

            (6, 7),

            (7, 8),

            (7, 7),

            (6, 12),

            (11, 12),

        ]:

            linerange1, skipped = filteredblocks(self.blocks, linerange2)

            self.assertEqual(linerange1, (7, 12))

            self.assertEqual(skipped, [True, True, False, True])

    def testAccrossTwoBlocks(self):

        """linerange accross two blocks"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #      ^^^^

        linerange2 = (1, 5)

        linerange1, skipped = filteredblocks(self.blocks, linerange2)

        self.assertEqual(linerange1, (0, 6))

        self.assertEqual(skipped, [False, False, True, True])

    def testCrossingSeveralBlocks(self):

        """linerange accross three blocks"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #      ^^^^^^^

        linerange2 = (1, 8)

        linerange1, skipped = filteredblocks(self.blocks, linerange2)

        self.assertEqual(linerange1, (0, 12))

        self.assertEqual(skipped, [False, False, False, True])

    def testStartInEqBlock(self):

        """linerange starting in an "=" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #          ^^^^

        #         ^^^^^^^

        for linerange2, expectedlinerange1 in [

            ((5, 9), (6, 12)),

            ((4, 11), (5, 12)),

        ]:

            linerange1, skipped = filteredblocks(self.blocks, linerange2)

            self.assertEqual(linerange1, expectedlinerange1)

            self.assertEqual(skipped, [True, False, False, True])

    def testEndInEqBlock(self):

        """linerange ending in an "=" block"""

        # IDX 0         1

        #     012345678901

        # SRC NNOOOONNNNNN (New/Old)

        #      ^^

        #     ^^^^^

        for linerange2, expectedlinerange1 in [

            ((1, 3), (0, 4)),

            ((0, 4), (0, 5)),

        ]:

            linerange1, skipped = filteredblocks(self.blocks, linerange2)

            self.assertEqual(linerange1, expectedlinerange1)

            self.assertEqual(skipped, [False, False, True, True])

    def testOutOfRange(self):

        """linerange exceeding file size"""

        exctype = error.Abort

        for linerange2 in [

            (0, 34),

            (15, 12),

        ]:

            # Could be `with self.assertRaises(error.Abort)` but python2.6

            # does not have assertRaises context manager.

            try:

                mdiff.blocksinrange(self.blocks, linerange2)

            except exctype as exc:

                self.assertTrue('line range exceeds file size' in str(exc))

            else:

                self.fail('%s not raised' % exctype.__name__)

if __name__ == '__main__':

    import silenttestrunner

    silenttestrunner.main(__name__)