Cursed? String Arithmetic Library

[NihilisticPuffin]

String Arithmetic Library
Disclaim: This will crash the default shell. You must use an alternative shell

This library allows you to preform arithmetic on strings by using metatables to overload operators

SCPaste: rUwGtDf3Cr

Install:

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pastebin get rUwGtDf3Cr str_math.luaor

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wget https://p.sc3.io/api/v1/pastes/rUwGtDf3Cr/raw str_math.lua

Usage:

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#!str_math

—- Concatenation
—- Works with types: string, number, boolean, nil
local greeting = "Hello" + ", World!" —- greeting == "Hello, World!"

—- Substring
—- If left operand is a number subtract from beginning of string
—- If right operand is a number subtract from end of string
local greeting = 1-"Hello, World!"-8 —- greeting == "ello"

-- Repetition
local greeting = "Hi"*4 -- greeting == "HiHiHiHi"

—- Splitting
—- If right operand is a number split string into equal length pieces
—- If right operand is a string split string by delimiter
local tbl = "Hello, World!" / 4 —- tbl == {"Hell", "o, W", "orld"}
local tbl = "Hello, World!" / ", " —- tbl == {"Hello", "World!"}

—- Modulo returns remaining characters not equal to length
local str = "Hello, World!" % 4 —- str == "!"

-- Unary Minus reverses string
local greeting = -"Hello, World!" -- greeting == "!dlroW ,olleH"
p.s. This is probably the worst thing I've ever made

[NihilisticPuffin]

I've updated it with a "fix" for the default shell crash.

Example

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local old_mt = dofile("str_math.lua")

-- your code

debug.setmetatable("", old_mt)

[NihilisticPuffin]

Updated with a better fix for crashes

How to use:

In script

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#!str_math
-- Must be first line in file
or from shell

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str_math <script>

[NihilisticPuffin]

Added unary minus operator to reverse strings

Example:

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local greeting = -"Hello, World!" -- greeting == "!dlroW ,olleH"