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This Module is used by the Template:Color and produces color-boxes of the given names.

The available color names can be seen and expanded at Module:Color/codes, the according ids at Module:Color/ids.


local p = {}
local colorCodes = mw.loadData( 'Module:Color/codes' )
local colorIds = mw.loadData( 'Module:Color/ids' )

local function findColorName(colorId)
	for name, id in pairs(colorIds) do
		if id == colorId then
			return name
		end
	end
	return ''
end

function p.colors( f )
  local args = f:getParent().args
  local colorBlocks = {}
  local size = 20
  local colorNameLower = ''
  local colorId = 0
  local colorCode = ''
  local unknownId = 256

  --This slices one parameter into a variable number of parameters with a comma as a delimiter.
  --This allows the list to be called into another Template as its own parameter.
  local M_SLICES = {}
  for part in string.gmatch((args[1])..',', "([^,]*),") do
  	local slice = part:match "^%s*(.-)%s*$"
  	if #slice <= 3 and tonumber(slice) ~= nil then
  		slice = findColorName(slice)
  	end
    table.insert(M_SLICES, slice)
  end

  local colorIdsOrdered={}
  for _, colorNameInput in ipairs(M_SLICES) do
    colorNameLower = colorNameInput:gsub('%W',''):lower()

    colorId = colorIds[colorNameLower]
    if colorId ~= nil then
      colorId = tonumber(colorId)
    end

    -- colorId must be a number for the sorting later
    -- internally in this module, an unknown id is represented by numbers > 256
    if colorId == nil then
      colorId = unknownId
      unknownId = unknownId + 1
    end

    colorCode = colorCodes[colorNameLower]

    if colorCode ~= nil and not p.isColorNameInTable(colorIdsOrdered, colorNameLower) then
      table.insert(colorIdsOrdered, {colorId, colorCode, colorNameInput})
    end
  end

  -- the sorting function must be stable, i.e. a==b => b==a
  table.sort(colorIdsOrdered, function(a,b) return a[1] < b[1] end)

  -- colorInfo[1]: color Id
  -- colorInfo[2]: color code (hex)
  -- colorInfo[3]: color name as entered in the template call
  for _, colorInfo in ipairs(colorIdsOrdered) do
    table.insert(colorBlocks,'<div class="color-square" style="height:'..size..'px; width:'..size..'px; background:'..colorInfo[2]..';" title="'..colorInfo[3]..'&nbsp;&#40;'..(colorInfo[1] < 256 and colorInfo[1] or 'no id')..'&#41;">'..(colorInfo[1] < 256 and '<span>'..colorInfo[1]..'</span>' or '')..'</div>')
  end
  return '<div class="color-container">'..table.concat(colorBlocks)..'</div>'
end

function p.isColorNameInTable(tab, colorNameLower)
  for _, colorInfo in ipairs(tab) do
    if colorInfo[3] == colorNameLower then return true end
  end
  return false
end

return p
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