mirror of
https://github.com/sbrl/Minetest-WorldEditAdditions.git
synced 2024-11-05 06:53:52 +01:00
51 lines
1.6 KiB
Lua
51 lines
1.6 KiB
Lua
--[[
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Functions that operate on strings that *really* should be present in the Lua
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standard library, but somehow aren't.
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A good rule of thumb is to ask "does Javascript have a built-in function for
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this?". If yes, then your implementation probably belongs here.
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]]--
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--- Pads str to length len with char from right
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-- @source https://snipplr.com/view/13092/strlpad--pad-string-to-the-left
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local function str_padend(str, len, char)
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if char == nil then char = ' ' end
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return str .. string.rep(char, len - #str)
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end
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--- Pads str to length len with char from left
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-- Adapted from the above
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local function str_padstart(str, len, char)
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if char == nil then char = ' ' end
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return string.rep(char, len - #str) .. str
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end
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--- Equivalent to string.startsWith in JS
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-- @param str string The string to operate on
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-- @param start number The start string to look for
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-- @returns bool Whether start is present at the beginning of str
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local function str_starts(str, start)
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return string.sub(str, 1, string.len(start)) == start
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end
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--- Trims whitespace from a string from the beginning and the end.
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-- From http://lua-users.org/wiki/StringTrim
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-- @param str string The string to trim the whitespace from.
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-- @returns string A copy of the original string with the whitespace trimmed.
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local function trim(str)
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return (str:gsub("^%s*(.-)%s*$", "%1"))
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end
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if worldeditadditions then
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worldeditadditions.str_padend = str_padend
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worldeditadditions.str_padstart = str_padstart
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worldeditadditions.str_starts = str_starts
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worldeditadditions.trim = trim
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else
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return {
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str_padend = str_padend,
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str_padstart = str_padstart,
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str_starts = str_starts,
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trim = trim
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}
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end
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