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author | Philipp Gesang <phg@phi-gamma.net> | 2017-02-01 08:18:28 +0100 |
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committer | Philipp Gesang <phg@phi-gamma.net> | 2017-02-01 08:18:28 +0100 |
commit | 19ba6b14e20738c82ad539b2a4b0690e7880e3cb (patch) | |
tree | fa23bc0113f3a8f141e2ecd06a1d352665f408d7 /lualibs-util-tab.lua | |
parent | 12d27922f7bb7f466b5d476fa2c1ddc08a300513 (diff) | |
download | lualibs-19ba6b14e20738c82ad539b2a4b0690e7880e3cb.tar.gz |
sync with Context as of 2017-02-01
Diffstat (limited to 'lualibs-util-tab.lua')
-rw-r--r-- | lualibs-util-tab.lua | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/lualibs-util-tab.lua b/lualibs-util-tab.lua index 9266598..0521a2a 100644 --- a/lualibs-util-tab.lua +++ b/lualibs-util-tab.lua @@ -486,12 +486,12 @@ end local selfmapper = { __index = function(t,k) t[k] = k return k end } -function table.twowaymapper(t) - if not t then - t = { } - else - local zero = rawget(t,0) - for i=zero or 1,#t do +function table.twowaymapper(t) -- takes a 0/1 .. n indexed table and returns + if not t then -- it with string-numbers as indices + reverse + t = { } -- mapping (all strings) .. used in cvs etc but + else -- typically a helper that one forgets about + local zero = rawget(t,0) -- so it might move someplace else + for i=zero and 0 or 1,#t do local ti = t[i] -- t[1] = "one" if ti then local i = tostring(i) @@ -499,7 +499,6 @@ function table.twowaymapper(t) t[ti] = i -- t["one"] = "1" end end - t[""] = zero or "" end -- setmetatableindex(t,"key") setmetatable(t,selfmapper) |