Recipe: Cooks Only: Save/Load snips

created by Jean-Bob

Profile

• Name: Cooks Only: Save/Load snips
• ID: 45154
• Shared with: Public
• Parent: None
• Children: None
• Created on: January 10, 2013 at 03:03 AM UTC
• Updated on: January 10, 2013 at 03:03 AM UTC
• Description:

  A set of functions to concatenate an array in a string and restore such a "stringed" array. See comments.

Code

function tobool(val)
	local res
	if type(val)=='number' then
		if val==0 then res=false
		elseif val==1 then res=true
		else res=nil end
	elseif type(val)=='string' then
		if val=='false' then res=false
		elseif val=='true' then res=true
		else res=nil end
	else res=nil end
	return res
end

function SetCleanType(val)
	if tonumber(val)~=nil then return tonumber(val)
	elseif tobool(val)~=nil then return tobool(val)
	else return val end
end

function ConcatArray(array, depth)
	local s=''
	local depth=depth or 1
	local sep={' ',',','|'}
	for key, val in pairs(array) do
		if type(val)=='table' then
			s=s..key..sep[depth+1]..ConcatArray(val, depth+1)..sep[depth]
		else
			s=s..key..':'..tostring(val)..sep[depth]
		end
	end
	return s:sub(1,#s-1)
end

function RebuildArray(str, depth)
	local arr={}
	local depth=depth or 1
	local sep={' ',',','|','%^'}
	local subpat=''
	for i=1, depth do subpat=subpat..sep[i] end
	pattern="([^"..subpat.."]+)"
	for entity in string.gmatch(str, pattern) do
		if entity:find(sep[depth+1]) then
			key=string.match(entity,"([^"..sep[depth+1].."]+)")
			local len=#key
			key=SetCleanType(key)
			arr[key]=RebuildArray(entity:sub(len+2,#entity), depth+1)
		else
			key, val=string.match(entity,"([%w]+):([^"..subpat.."]+)")
			arr[SetCleanType(key)]=SetCleanType(val)
		end
	end
	return arr
end

Comments

[Jean-Bob]

That's a bit dirty but it's the only way I found to pause a running script (see feedback Cookbook - "pause" function). I store the data I need i an array that I concatenate with this function and store it in the note of a segment. The function RebuildArray emulates someway the core function loadstring().

See also feedback Recipe buffer + loadstring() core function

[Crashguard303]

Dirty? Why?
PHP does the same, as it can paste variable-contents into the browser's address bar and fetch them back later (the $_GET-array), hehe ;)
It can also do this with HTML-formular-entries (the $_POST-array)
Moreover, it can move sign-separated strings back to an array via explode()

So, it's something similar you are doing here with Lua.
Nice work!

[Bruno Kestemont]

Implemented by jean-Bob here for the first time:

Ebola Rebuild</>

Enjoy !