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local HF = {}
local getArgs = require('Dev:Arguments').getArgs
 
function HF.explode( sep, text )
  local sep, fields = sep or "::", {}
  local pattern = string.format("([^%s]+)", sep)
  text:gsub(pattern, function(c) fields[#fields+1] = c end)
  return fields
end
 
function HF.trim(s)
  if type(s) == "string" then
    return (s:gsub("^%s*(.-)%s*$", "%1"))
  else
    return false
  end
end
 
function HF.isempty(s)
  local result = false
  if type(s) == "nil" then
    result = true
  elseif type(s) == "string" then
    if s == "" then
      result = true
    end
  elseif type(s) == "table" then
    if next(s) == nil then
      result = true
    end
  end
  return result
end
 
function HF.print_r( t, name, indent )
  local cart     -- a container
  local autoref  -- for self references
 
  --[[ counts the number of elements in a table
  local function tablecount(t)
     local n = 0
     for _, _ in pairs(t) do n = n+1 end
     return n
  end
  ]]
  -- (RiciLake) returns true if the table is empty
  local function isemptytable(t) return next(t) == nil end
 
  local function basicSerialize (o)
     local so = tostring(o)
     if type(o) == "function" then
        local info = debug.getinfo(o, "S")
        -- info.name is nil because o is not a calling level
        if info.what == "C" then
           return string.format("%q", so .. ", C function")
        else 
           -- the information is defined through lines
           return string.format("%q", so .. ", defined in (" ..
               info.linedefined .. "-" .. info.lastlinedefined ..
               ")" .. info.source)
        end
     elseif type(o) == "number" or type(o) == "boolean" then
        return so
     else
        return string.format("%q", so)
     end
  end
 
  local function addtocart (value, name, indent, saved, field)
     indent = indent or ""
     saved = saved or {}
     field = field or name
 
     cart = cart .. indent .. field
 
     if type(value) ~= "table" then
        cart = cart .. " = " .. basicSerialize(value) .. ";\n"
     else
        if saved[value] then
           cart = cart .. " = {}; -- " .. saved[value] 
                       .. " (self reference)\n"
           autoref = autoref ..  name .. " = " .. saved[value] .. ";\n"
        else
           saved[value] = name
           --if tablecount(value) == 0 then
           if isemptytable(value) then
              cart = cart .. " = {};\n"
           else
              cart = cart .. " = {\n"
              for k, v in pairs(value) do
                 k = basicSerialize(k)
                 local fname = string.format("%s[%s]", name, k)
                 field = string.format("[%s]", k)
                 -- three spaces between levels
                 addtocart(v, fname, indent .. "   ", saved, field)
              end
              cart = cart .. indent .. "};\n"
           end
        end
     end
  end
 
  name = name or "__unnamed__"
  if type(t) ~= "table" then
     return name .. " = " .. basicSerialize(t)
  end
  cart, autoref = "", ""
  addtocart(t, name, indent)
  return cart .. autoref
end
 
function HF.firstToUpper( str )
return (str:gsub("^%l", string.upper))
end
 
function HF.round(num, idp)
  local mult = 10^(idp or 0)
  return math.floor(num * mult + 0.5) / mult
end
 
function HF.AddZeros( s, len )
  local output = ""
 
  local sLength = string.len( tostring( s ) )
  local diff = tonumber( len ) - tonumber( sLength )
 
  if diff > 0 then
    for i = 1, diff do
      output = output .. "0"
    end
  end
 
  output = output .. s
 
  return output
end
 
function HF.ExternalLink( link, text, plain )
  local output = "[" .. link .. " " .. text .. "]"
 
  if plain == true then
    output = "<span class=\"plainlinks\">" .. output .. "</span>"
  end  
 
  return output
end
 
function HF.CategoryLink( category, sort, text )
  local output = ""
  if not HF.isempty( text ) then
    output = "[[:Category:" .. category .. "|" .. text .. "]][[Category:" .. category .. "|" .. sort .. "]]"
  else 
    output = "[[Category:" .. category .. "|" .. sort .. "]]"
  end
  return output
end
 
function HF.Link( link, text )
  local output = "[[" .. link
 
  if not HF.isempty( text ) then
    output = output .. "|" .. text
  end
 
  output = output .. "]]"
 
  return output
end
 
function HF.HelpButton( frame )
	local args = getArgs( frame )
	return HF._HelpButton( args )
end
 
function HF._HelpButton( args )
  if HF.isempty( args.buttonsize ) then args.buttonsize = "10px" end
  local target = args.ArticleTarget or "Click here for help with this field"
	local link = string.format(
		"[[File:Information-silk.png|%s|link=Click here for help with this field#%s]] %s",
		args.buttonsize,
		args.Section or args.Label or '',
    args.Label or ''
	)
  return link
end
 
return HF

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