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patch 8.2.5003: cannot do bitwise shifts

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Problem:    Cannot do bitwise shifts.
Solution:   Add the >> and << operators. (Yegappan Lakshmanan, closes #8457)
This commit is contained in:
Yegappan Lakshmanan
2022-05-22 19:13:49 +01:00
committed by Bram Moolenaar
parent 9b2edfd3bf
commit a061f34191
11 changed files with 554 additions and 160 deletions
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62
src/testdir/test_expr.vim
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@@ -946,4 +946,66 @@ func Test_string_interp()
call v9.CheckDefAndScriptSuccess(lines)
endfunc
" Test for bitwise left and right shift (<< and >>)
func Test_bitwise_shift()
let lines =<< trim END
call assert_equal(16, 1 << 4)
call assert_equal(2, 16 >> 3)
call assert_equal(0, 0 << 2)
call assert_equal(0, 0 >> 4)
call assert_equal(3, 3 << 0)
call assert_equal(3, 3 >> 0)
call assert_equal(0, 0 >> 4)
call assert_equal(0, 999999 >> 100)
call assert_equal(0, 999999 << 100)
VAR a = 8
VAR b = 2
call assert_equal(2, a >> b)
call assert_equal(32, a << b)
#" operator precedence
call assert_equal(48, 1 + 2 << 5 - 1)
call assert_equal(3, 8 + 4 >> 4 - 2)
call assert_true(1 << 2 < 1 << 3)
call assert_true(1 << 4 > 1 << 3)
VAR val = 0
for i in range(0, v:numbersize - 2)
LET val = or(val, 1 << i)
endfor
call assert_equal(v:numbermax, val)
LET val = v:numbermax
for i in range(0, v:numbersize - 2)
LET val = and(val, invert(1 << i))
endfor
call assert_equal(0, val)
#" multiple operators
call assert_equal(16, 1 << 2 << 2)
call assert_equal(4, 64 >> 2 >> 2)
call assert_true(1 << 2 << 2 == 256 >> 2 >> 2)
END
call v9.CheckLegacyAndVim9Success(lines)
call v9.CheckLegacyAndVim9Failure(['VAR v = 2 << -1'], ['E1283:', 'E1283:', 'E1283:'])
call v9.CheckLegacyAndVim9Failure(['VAR a = 2', 'VAR b = -1', 'VAR v = a << b'], ['E1283:', 'E1283:', 'E1283:'])
call v9.CheckLegacyAndVim9Failure(['VAR v = "8" >> 2'], ['E1282:', 'E1282:', 'E1282:'])
call v9.CheckLegacyAndVim9Failure(['VAR v = 1 << "2"'], ['E1282:', 'E1282:', 'E1282:'])
call v9.CheckLegacyAndVim9Failure(['VAR a = "8"', 'VAR b = 2', 'VAR v = a << b'], ['E1282:', 'E1012:', 'E1282:'])
call v9.CheckLegacyAndVim9Failure(['VAR a = 8', 'VAR b = "2"', 'VAR v = a >> b'], ['E1282:', 'E1012:', 'E1282:'])
call v9.CheckLegacyAndVim9Failure(['VAR v = ![] << 1'], ['E745:', 'E1012:', 'E1282:'])
call v9.CheckLegacyAndVim9Failure(['VAR v = 1 << ![]'], ['E745:', 'E1012:', 'E1282:'])
call v9.CheckLegacyAndVim9Failure(['VAR v = ![] >> 1'], ['E745:', 'E1012:', 'E1282:'])
call v9.CheckLegacyAndVim9Failure(['VAR v = 1 >> ![]'], ['E745:', 'E1012:', 'E1282:'])
call v9.CheckDefAndScriptFailure(['echo 1<< 2'], ['E1004:', 'E1004:'])
call v9.CheckDefAndScriptFailure(['echo 1 <<2'], ['E1004:', 'E1004:'])
call v9.CheckDefAndScriptFailure(['echo 1>> 2'], ['E1004:', 'E1004:'])
call v9.CheckDefAndScriptFailure(['echo 1 >>2'], ['E1004:', 'E1004:'])
let lines =<< trim END
var a = 1
<<
4
assert_equal(16, a)
END
call v9.CheckDefAndScriptSuccess(lines)
endfunc
" vim: shiftwidth=2 sts=2 expandtab