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--- Shared functions
-- - Used by Nvim and tests
-- - Can run in vanilla Lua (do not require a running instance of Nvim)
-- Checks if a list-like (vector) table contains `value`.
local function tbl_contains(t, value)
if type(t) ~= 'table' then
error('t must be a table')
end
for _,v in ipairs(t) do
if v == value then
return true
end
end
return false
end
--- Merges two or more map-like tables.
--
--@see |extend()|
--
-- behavior: Decides what to do if a key is found in more than one map:
-- "error": raise an error
-- "keep": use value from the leftmost map
-- "force": use value from the rightmost map
local function tbl_extend(behavior, ...)
if (behavior ~= 'error' and behavior ~= 'keep' and behavior ~= 'force') then
error('invalid "behavior": '..tostring(behavior))
end
local ret = {}
for i = 1, select('#', ...) do
local tbl = select(i, ...)
if tbl then
for k, v in pairs(tbl) do
if behavior ~= 'force' and ret[k] ~= nil then
if behavior == 'error' then
error('key found in more than one map: '..k)
end -- Else behavior is "keep".
else
ret[k] = v
end
end
end
end
return ret
end
-- Flattens a list-like table: unrolls and appends nested tables to table `t`.
local function tbl_flatten(t)
-- From https://github.com/premake/premake-core/blob/master/src/base/table.lua
local result = {}
local function _tbl_flatten(_t)
local n = #_t
for i = 1, n do
local v = _t[i]
if type(v) == "table" then
_tbl_flatten(v)
elseif v then
table.insert(result, v)
end
end
end
_tbl_flatten(t)
return result
end
local module = {
tbl_contains = tbl_contains,
tbl_extend = tbl_extend,
tbl_flatten = tbl_flatten,
}
return module
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