mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-06-03 05:03:02 +00:00
101 lines
3.1 KiB
Lua
101 lines
3.1 KiB
Lua
--- Shallow clones a table.
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-- @source http://lua-users.org/wiki/CopyTable
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-- @param orig table The table to clone.
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-- @return table The cloned table.
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function worldeditadditions.shallowcopy(orig)
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local orig_type = type(orig)
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local copy
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if orig_type == 'table' then
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copy = {}
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for orig_key, orig_value in pairs(orig) do
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copy[orig_key] = orig_value
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end
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else -- number, string, boolean, etc
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copy = orig
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end
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return copy
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end
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--- SHALLOW ONLY - applies the values in source to overwrite the equivalent keys in target.
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-- Warning: This function mutates target!
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-- @param source table The source to take values from
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-- @param target table The target to write values to
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function worldeditadditions.table_apply(source, target)
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for key, value in pairs(source) do
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target[key] = value
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end
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end
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--- Polyfill for unpack / table.unpack.
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-- Calls unpack when available, and looks for table.unpack if unpack() isn't
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-- found.
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-- This is needed because in Lua 5.1 it's the global unpack(), but in Lua 5.4
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-- it's moved to table.unpack().
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function worldeditadditions.table_unpack(tbl, offset, count)
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if type(unpack) == "function" then
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return unpack(tbl, offset, count)
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else
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return table.unpack(tbl, offset, count)
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end
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end
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--- Returns only the last count items in a given numerical table-based list.
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function worldeditadditions.table_get_last(tbl, count)
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return {worldeditadditions.table_unpack(
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tbl,
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math.max(0, (#tbl) - (count - 1))
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)}
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end
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--- Returns the key value pairs in a table as a single string
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-- @param tbl table input table
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-- @param sep string key value seperator
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-- @param new_line string key value pair delimiter
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-- @return string concatenated table pairs
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function worldeditadditions.table_tostring(tbl, sep, new_line)
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if type(sep) ~= "string" then sep = ": " end
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if type(new_line) ~= "string" then new_line = ", " end
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local ret = {}
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if type(tbl) ~= "table" then return "Error: input not table!" end
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for key,value in pairs(tbl) do
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ret:append(key)
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ret:append(sep)
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ret:append(value)
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ret:append(new_line)
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end
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return ret:concat("")
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end
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--- Executes the given function on every item in the given table.
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-- Ignores return values that are nil and doesn't insert them into the table.
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-- @param tbl table The table to operate on.
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-- @param func function The function to execute on every item in the table.
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-- @returns table A new table containing the return values of the function.
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function worldeditadditions.table_map(tbl, func)
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local result = {}
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for i,value in ipairs(tbl) do
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local newval = func(value, i)
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if newval ~= nil then table.insert(tbl, newval) end
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end
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end
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--- Builds a new table with the elements of the given table appearing at most once.
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-- @param tbl table The table of values to make unique.
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-- @returns table A new table containing the values of the given table appearing at most once.
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function worldeditadditions.table_unique(tbl)
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local newtbl = {}
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for i,value in ipairs(tbl) do
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local seen = false
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for j,seenvalue in ipairs(newtbl) do
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if value == seenvalue then
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seen = true
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break
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end
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end
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if not seen then
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table.insert(newtbl, value)
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end
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end
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return newtbl
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end
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