Module:SimpleDebug

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Contains a functions to help debug the lua modules. It allows to collect and view the values of several variables and/or points in your lua program, from a module (which is usual) or in several modules (which are required from the main module).

It is designed so that its functions are called from within the module that is to be debugged, calls that will have to be part of the code (of the module that you have designed, or that you want to improve or adapt) until you decide to delete them (when you already have determined the bug). Thus, you do not have to call any of its functions from an invoke.

Uses

One or several points to watch
Function abbreviations: w: where. n: names. v: variables. s: string.
Variables
Name	Default
tab.oneline	true	If it is false or it is true and contains nested tables, it will show a line for each item in the table and with an indent for each nested table. If it is true and it does not contain nested tables, it shows the table in a line.
tab.allidx	false	If it is true then also displays the numerical indexes of a table.
dec	-1	Spaces for the decimals: -1: It displays all required decimals. 0: No decimals. n: 1: one decimal, 2: two decimals, etc.
enabled	true	If it is false all calls to the below functions do nothing.
nohtml	false	In strings, it replaces < for ⪡ and > for ⪢.
plaintext	false	Deletes html format.
One point to watch
Functions
w (where)		where: point label.
v (...)		...: a number of variables = var1, var2...
wv (where, ...)		where: point label. ...: a number of variables = var1, var2...
nv (...)		...: a number of pairs of name-variable = name1, var1, name2, var2....
wnv (where, ...)		where: point label. ...: a number of pairs of name-variable = name1, var1, name2, var2....
Several points to watch
Variables
Name	Default
s		The string variable that holds the returned values from the next functions.
maxlines.num	100	The maxim number of lines (on calling the next functions).
maxlines.doerror	true	If it is true and maxlines.num is reached, error(s) is called.
counter	false	Adds an autoincremental number at the beginning of each call of a function.
Functions
breakline ()		Adds a break line in s.
wtos (where)		Equal to w, but the return string is stored in s.
vtos (...)		Equal to v, but the return string is stored in s.
wvtos (where, ...)		Equal to wv, but the return string is stored in s.
nvtos (...)		Equal to nv, but the return string is stored in s.
wnvtos (where, ...)		Igual a wnv, but the return string is stored in s.

Examples

One point to watch

Following the flow

local SD = require "Module:SimpleDebug"
return SD.v ('Here is reached')

returns:

Here is reached

Number of decimal places and value of a variable

local SD = require "Module:SimpleDebug"
SD.dec = 2
return SD.v (1/3)

returns:

0.33

Nohtml

local SD = require "Module:SimpleDebug"
SD.nohtml = true
return SD.v ("<b>bold</b>")

returns:

"⪡b⪢bold⪡/b⪢"

Plaintext

local SD = require "Module:SimpleDebug"
SD.plaintext = true
return SD.v ("<b>bold</b>")

returns:

"bold"

The value of several variables

local SD = require "Module:SimpleDebug"
local a = 12
local b = 'Hello'
return SD.v (a,b)

returns:

12  •  "Hello"

Non-assigned variable detection

local SD = require "Module:SimpleDebug"
local a = true
return SD.v (a,b)

returns:

true  •  nil

The value of a table

local SD = require "Module:SimpleDebug"
local a = {1, tab='a', 'b'}
return SD.v (a)

returns: { 1, "b", [tab]="a", }

local SD = require "Module:SimpleDebug"
local a = {{1,2,3},{4,5,6},{7,8,9}}
return SD.v (a)

returns:

{
  [1] = {1, 2, 3, },
  [2] = {4, 5, 6, },
  [3] = {7, 8, 9, },
} 

local SD = require "Module:SimpleDebug"
local a = {{First=1,2,3},{4,Second=5,6},{7,8,9}}
return SD.v (a)

returns:

{ 
 [1] = {2, 3, [First]=1, },
 [2] = {4, 6, [Second]=5, },
 [3] = {7, 8, 9, },
}

local SD = require "Module:SimpleDebug"
SD.tab.allidx = true
local a = {{1,2,3},{4,nil,6},{7,8,9}}
return SD.v (a)

returns:

{ 
  [1]={[1]=1, [2]=2, [3]=3, }, 
  [2]={[1]=4, [3]=6, }, 
  [3]={[1]=7, [2]=8, [3]=9, }, 
}

Usually, you implement these functions with error function:

local SD = require "Module:SimpleDebug"
local a = {{1,2,3},{4,5,6},{7,8,9}}
error (SD.v (a))

displays:

Lua error:Module:YourModule:Line:{

   [1] = {1, 2, 3, },
   [2] = {4, 5, 6, },
   [3] = {7, 8, 9, },
 }

All values of a table in multiline

local SD = require "Module:SimpleDebug"
SD.tab.oneline = false
local a = {{First=1,2,3},'Middle',{4,Second=5,6}}
return SD.v (a)

retorna:

{
 [1] = {
     [1] = 2,
     [2] = 3,
     ["First"] = 1,
   },
 [2] = "Middle",
 [3] = {
     [1] = 4,
     [2] = 6,
     ["Second"] = 5,
   },
}

The value of several variables with their name in a point

local SD = require "Module:SimpleDebug"
local a = 12
local b = 'Hello'
return SD.nv ('a',a,'b',b)

returns:

a: 12  •  b: "Hello"

Several points to watch

Following the flow

local SD = require "Module:SimpleDebug" 
local tab = {1,12,7}
function p.CheckValues ()
  local function LittleNum()
    SD.wtos ('little number')
  end
  local function BigNum(num)
    SD.wtos ('big='..num)
  end
  for i, num in ipairs(tab) do
    if num > 9 then
      BigNum(num)
    else
      LittleNum()
    end  
  end  
  error (SD.s)
end

returns:

Lua Error:Module:Your module:Line:

little number

big=12

little number.

With counter

local SD = require "Module:SimpleDebug" 
function Increm()
  local n = 0
  for i = 1, 3 do
    n = n + 2
    SD.vtos (n)
  end
end
SD.counter = true
Increm()
return SD.s

returns:

1  •  2

2  •  4

3  •  6

Monitoring of several variables

local SD = require "Module:SimpleDebug"
a = 12
b = 'Hello'
SD.vtos (1,a,b)
a = a + a
b = b..' world!'
SD.vtos ('Finally',a,b)
return SD.s

returns:

1 => 12  •  "Hello"

Finally => 24  •  "Hello world!"

local SD = require "Module:SimpleDebug"
SD.breakline ()
a = 12
b = 'Hello'
c = false
SD.nvtos (1,'a',a,'b',b,'c',c)
a = a + a
b = b..' world!'
SD.nvtos ('Finally','a',a,'b',b)
error (SD.s)

displays:

Lua error:Module:YourModule:Line:

1 => a: 12  •  b: "Hello"  •  c: false

Finally => a: 24  •  b: "Hello world!"

Variables and their presentation with conditions

local SD = require "Module:SimpleDebug"
SD.breakline()
SD.enabled = false
SD.maxlines.num = 3
local a = 'AA'
for i = 1, 10 do
  a = a + 'AA'
  if i == 3 then
    SD.enabled = true
  end
  SD.nvtos (i, string.len(a), a)
end

displays:

Lua error:Module:YourModule:Line:

3 => 8  •  "AAAAAAAA"

4 => 10  •  "AAAAAAAAAA"

5 => 12  •  "AAAAAAAAAAAA".

The above documentation is transcluded from Module:SimpleDebug/doc. (edit | history)
Editors can experiment in this module's sandbox (edit | diff) and testcases (create) pages.
Subpages of this module.

local p = {}

p.s = ''
p.allidx = false
p.dec = -1
p.maxlines = {
	num = 100,
    doerror = true
    }
p.enabled = true

local LinCount = 0

function p.breakline ()
	if p.s ~= '' then
		LinCount = LinCount + 1
	end	
	p.s = p.s..'\n\n'
	if (LinCount > p.maxlines.num) and p.maxlines.doerror then
		error (p.s,0)
	end	
end	

function p.var (avar, where)
	if p.enabled then
		if type(avar) == 'table' then
			local wds = '{ '
			for k,v in pairs(avar) do
				if (p.allidx == true) or (type(k) ~= 'number')  then 
					wds = wds..'['..k..']='..p.var(v)..', '
				else	
					wds = wds..p.var(v)..', '
				end
			end
			EndStr = wds .. '} '
		elseif type(avar) == 'number' then
			if (p.dec == -1) or (avar == math.floor(avar)) then
				EndStr = tostring(avar)
			else
				EndStr = tostring (math.floor ((avar*10^p.dec)+0.5) / (10^p.dec))
			end	
		elseif type(avar) == 'boolean' then
			if avar == true then
				EndStr = 'true'
			else
				EndStr = 'false'
			end	
		else	
			EndStr = '"'..tostring(avar)..'"'
		end
		if where == nil then
			return EndStr
		else	
			return where.. ' => '..EndStr
		end
	end	
end --var

function p.array (anarray, where)
	if p.enabled then
		local EndStr = ''
		if type(anarray) ~= 'table' then
			EndStr = 'The param to debug is not a table'
		else
			local s = ''
			local C = 0
			function Concat(wds)
				if s ~= '' then
					s = s..' - '
				end
				s = s..wds
			end	
			for i, avar in pairs(anarray) do
				Concat (p.var(avar))
				C = C + 1
			end
			local Dif = #anarray - C
			if Dif == 1 then
				s = '1 variable is nil! '..s
			elseif Dif > 1 then	
				s = Dif..' variables are nil! '..s
			end	
			EndStr = s
		end	    	
		if where == nil then
			return EndStr
		else	
			return where.. ' => '..EndStr
		end
	end	
end --array

function p.namearray (anarray, where)
	if p.enabled then
		local EndStr = ''
		if type(anarray) ~= 'table' then
			EndStr = 'The param to debug is not a table'
		elseif math.mod(#anarray,2) ~= 0 then	
			EndStr = 'Any parameter has not a name or variable; or any variable is nil'
		else
			local s = ''
			local C = 0
			local IsName = true
			function Concat(wds)
				if s ~= '' then
					if IsName then
						s = s..' - '
					else	
						s = s..': '
					end	
				end
				s = s..wds
			end
			for i, avar in pairs(anarray) do
				if IsName then
					Concat (avar)
					IsName = false
				else	
					Concat (p.var(avar))
					IsName = true
				end	
				C = C + 1
			end
			local Dif = #anarray - C
			if Dif == 1 then
				s = '1 variable is nil! '..s
			elseif Dif > 1 then	
				s = Dif..' variables are nil! '..s
			end	
			EndStr = s
		end	    	
		if where == nil then
			return EndStr
		else	
			return where.. ' => '..EndStr
		end
	end	
end --namearray

function p.wheretos (where)
	if p.enabled and (LinCount < p.maxlines.num) then
		if p.s ~= '' then
			p.breakline ()
		end	
		if where == nil then
			where =  '"where" not assigned'
		end	
		p.s = p.s..where
	end	
end --wheretos

function p.arraytos (anarray, where)
	if p.enabled and (LinCount < p.maxlines.num) then
		if p.s ~= '' then
			p.breakline ()
		end	
		p.s = p.s..p.array (anarray, where)
	end	
end --arraytos

function p.namearraytos (anarray, where)
	if p.enabled and (LinCount < p.maxlines.num) then
		if p.s ~= '' then
			p.breakline ()
		end	
		p.s = p.s..p.namearray (anarray, where)
	end	
end --namearraytos

return p