import struct

from mercurial import (

    bdiff,

    mpatch,

)

def test1(a, b):

    d = bdiff.bdiff(a, b)

    c = a

    if d:

        c = mpatch.patches(a, [d])

    if c != b:

def test(a, b):

    test1(a, b)

    test1(b, a)

test("a\nc\n\n\n\n", "a\nb\n\n\n")

test("a\nb\nc\n", "a\nc\n")

test("", "")

test("a\nb\nc", "a\nb\nc")

test("a\nb\nc\nd\n", "a\nd\n")

test("a\nb\nc\nd\n", "a\nc\ne\n")

test("a\nb\nc\n", "a\nc\n")

test("a\n", "c\na\nb\n")

test("a\n", "")

test("a\n", "b\nc\n")

test("a\n", "c\na\n")

test("", "adjfkjdjksdhfksj")

test("", "ab")

test("", "abc")

test("a", "a")

test("ab", "ab")

test("abc", "abc")

test("a\n", "a\n")

test("a\nb", "a\nb")

#issue1295

def showdiff(a, b):

    bin = bdiff.bdiff(a, b)

    pos = 0

    while pos < len(bin):

        p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])

        pos += 12

        pos += l

showdiff("x\n\nx\n\nx\n\nx\n\nz\n", "x\n\nx\n\ny\n\nx\n\nx\n\nz\n")

showdiff("x\n\nx\n\nx\n\nx\n\nz\n", "x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n")

def testfixws(a, b, allws):

    c = bdiff.fixws(a, allws)

    if c != b:

testfixws(" \ta\r b\t\n", "ab\n", 1)

testfixws(" \ta\r b\t\n", " a b\n", 0)

testfixws("", "", 1)

testfixws("", "", 0)