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Use `table.move` to implement `common.splice` (#1324) 

* Use `table.move` to implement `common.splice`

* Disallow negative `remove` in `common.splice`
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xwii 2023-01-14 01:33:13 +07:00 committed by GitHub
parent 673c564e09
commit 6e04a4f970
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1 changed files with 4 additions and 15 deletions
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19
data/core/common.lua
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@ -82,23 +82,12 @@ end
function common.splice(t, at, remove, insert) function common.splice(t, at, remove, insert)
assert(remove >= 0, "bad argument #3 to 'splice' (non-negative value expected)")
insert = insert or {} insert = insert or {}
local offset = #insert - remove local len = #insert
local old_len = #t if remove ~= len then table.move(t, at + remove, #t + remove, at + len) end
if offset < 0 then table.move(insert, 1, len, at, t)
for i = at - offset, old_len - offset do
t[i + offset] = t[i]
end end
elseif offset > 0 then
for i = old_len, at, -1 do
t[i + offset] = t[i]
end
end
for i, item in ipairs(insert) do
t[at + i - 1] = item
end
end
local function compare_score(a, b) local function compare_score(a, b)