91 lines
3.2 KiB
Lua
91 lines
3.2 KiB
Lua
--[[
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Copyright (c) 2015, Robert 'Bobby' Zenz
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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--]]
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--- Various functions for working with numbers.
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numberutil = {}
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--- Formats the given number into a nice, readable string.
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--
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-- @param number The number to format.
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-- @param decimal_places Optional. How many decimal places to show. The number
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-- will be rounded to this amount of decimal places,
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-- if omitted, as many as there are are printed.
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-- @param decimal_separator Optional. The decimal separator to use, defaults
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-- to a dot.
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-- @param thousand_separator Optional. The thousand separator to use, defaults
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-- to a comma.
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-- @return The formatted number.
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function numberutil.format(number, decimal_places, decimal_separator, thousand_separator)
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decimal_separator = decimal_separator or "."
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thousand_separator = thousand_separator or ","
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if decimal_places then
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number = mathutil.round(number, decimal_places)
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end
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local number_string = tostring(number)
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local start_index, end_index, minus, integer, fraction = string.find(number_string, "(-?)(%d+)([.]?%d*)")
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local formatted = ""
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if #integer > 3 then
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for index = #integer, 3, -3 do
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formatted = thousand_separator .. string.sub(integer, index - 2, index) .. formatted
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end
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local rest = math.fmod(#integer, 3)
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if rest > 0 then
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formatted = string.sub(integer, 1, rest) .. formatted
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end
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else
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formatted = integer .. formatted
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end
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if minus ~= nil and minus ~= "" then
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formatted = minus .. formatted
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end
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if decimal_places == nil or decimal_places > 0 then
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if fraction ~= nil and fraction ~= "" then
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fraction = string.sub(fraction, 2)
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if decimal_places and #fraction < decimal_places then
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fraction = fraction .. string.rep("0", decimal_places - #fraction)
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end
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formatted = formatted .. decimal_separator .. fraction
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elseif decimal_places ~= nil then
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formatted = formatted .. decimal_separator .. string.rep("0", decimal_places)
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end
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end
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return formatted
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end
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