First instance of string.gsub doesn't seem to work

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1

I’m writing an interpreter for my own programming language. I’m using string.gsub to replace a period with a parentheses based on spacing behind and before it.

This is my code:

print(v, string.match(v, " %."))
local gsub1 = string.gsub(v, " %.", "(")
values[#values + 1] = gsub1
values[#values] = string.gsub(v, "%. ", ")")

  • The print outputs this:

    image

    which confirms that the period exists.

  • gsub1 just doesn’t seem to work at all. (even when it’s not a variable it doesn’t work)

  • The second gsub works just fine.

Here’s the finished output:

image

I’ve been stuck on this for quite a while, so some help would be appreciated. Thanks!

2

It’s working for me, is it an issue with how you are implementing it in that table?

3

I’m not sure. Here’s the full code (this project’s gonna be open-source anyway so idc)

local module = {}
local values = {}

function module.Interpret(code)
	code = code:split("%")
	for i, v in ipairs(code) do
		if i % 2 == 0 then
			values[#values + 1] = '"' .. v .. '"'
			code[i] = "↔remove╣"
		elseif string.find(v, "local ") then
			if i ~= 1 then
				values[#values + 1] = "\n" .. string.sub(v, 2)
			else
				values[#values + 1] = v
			end
			code[i] = "↔remove╣"
		else
			local gsub1 = string.gsub(v, " %.", "(")
			values[#values + 1] = gsub1
			values[#values] = string.gsub(v, "%. ", ")")
		end
	end
	code = nil
	local nvalue = table.concat(values)
	print(nvalue)
	local r = loadstring(nvalue) -- yes ik this isn't running
end

return module

The text being fed in is this:

local yes is %hello world% local howdy is %howdy% print .yes, howdy.
4 
local gsub1 = string.gsub(v, " %.", "(")
values[#values + 1] = gsub1
values[#values] = string.gsub(v, "%. ", ")")

That last line there is overwriting the line before it. Did you mean to make it +1 or -1 to the table index?

1 Like
5

No, I want it to gsub both periods. When I +1, it just creates 2 different print statements. I’m assuming I have to pass the whole string through a table or function then?

6

I’m not entirely sure what your point is with this bit of code since I didn’t fully read over your script. Do you want it to grab everything in between the parentheses too so that it’s just one value in the table?

7

I think so. Ideally I want it to go from

[5] = print .yes, howdy.

to

[5] = print(yes, howdy)
8

I was able to emulate this without string.gsub:

local toConcat = string.split(v, ".")
toConcat[1] = toConcat[1] .. "("
toConcat[3] = ")" .. toConcat[3]
values[#values + 1] = table.concat(toConcat)

However, this doesn’t solve the general problem.

9

Oh I see. I was overcomplicating things. I think you can just get away with this, no?

values[#values+1] = v:gsub(" %.", "("):gsub("%. ", ")")
1 Like