Psiĥedelisto: Implements Template:Rainbow

2020-07-19T20:06:23Z

New page

local p = {}

local function format_it(tbl, name)
for i, v in ipairs(tbl) do
tbl[i] = string.format("%06x", tbl[i])
end
p[name] = tbl
end

local function mod(a, b)
return a - math.floor(a/b) * b
end

-- takes hex color as string, gives back table
local function colorTable(color)
local clen = string.len(color)
assert(clen >= 6 and clen <= 8)
assert(string.gmatch("^"..("[0-9a-fA-F]"):rep(6)..("[0-9a-fA-F]?"):rep(2).."$", color))
local ret = {}
ret["R"] = tonumber(color:sub(1,2), 16)
ret["G"] = tonumber(color:sub(3,4), 16)
ret["B"] = tonumber(color:sub(5,6), 16)
ret["A"] = tonumber(color:sub(7,8), 16) or 255
return ret
end
local black = colorTable("000000")
local white = colorTable("FFFFFF")

local function colorAsRGBA(colorTbl)
return string.format("rgba(%.2f,%.2f,%.2f,%.2f)",
colorTbl["R"], colorTbl["G"],
colorTbl["B"], colorTbl["A"])
end

-- simple mix of two colors. t_ means target. percent is as float (.4=40%)
local function colorMix(colorTbl, t_colorTbl, percent)
local ret = {}
local diff = {}
diff["R"] = t_colorTbl["R"] - colorTbl["R"]
diff["G"] = t_colorTbl["G"] - colorTbl["G"]
diff["B"] = t_colorTbl["B"] - colorTbl["B"]
diff["A"] = t_colorTbl["A"] - colorTbl["A"]
ret["R"] = colorTbl["R"] + (diff["R"] * percent)
ret["G"] = colorTbl["G"] + (diff["G"] * percent)
ret["B"] = colorTbl["B"] + (diff["B"] * percent)
ret["A"] = colorTbl["A"] + (diff["A"] * percent)
return ret
end

p.HTML = function(frame, page)
local args = require('Module:Arguments').getArgs(frame)
p.args = args
local ret = ''
local inp = args[1]
if not inp then return nil end
local steps = mw.ustring.len(inp)
local repeat_ = (args["repeat"] and tonumber(args["repeat"])) or 1

local newcolors = {}
if args.colors then
for k = 1, repeat_, 1 do
nc = mw.text.gsplit(args.colors, ",", true)

for c in nc do
newcolors[#newcolors+1] = tonumber(c:sub(2, -1), 16)
end
end
end

format_it(#newcolors > 0 and newcolors or
-- red orange yellow green blue indigo-violet
{0xFF0000, 0xFF7F00, 0xFFFF00, 0x00FF00, 0x0000FF, 0x8B00FF}, "roygbiv")

-- lua pattern from https://stackoverflow.com/questions/13235091/extract-the-first-letter-of-a-utf-8-string-with-lua
local i = 0
for c in inp:gmatch("[%z\1-\127\194-\244][\128-\191]*") do
local color = colorTable(p.roygbiv[mod(i, #p.roygbiv)+1])

local s_per = steps / #p.roygbiv
local j = (i / s_per)
local jf = math.floor(j)
if args.gradient then
local cidx = mod(jf, #p.roygbiv)+1
if mod(cidx, 2) == 0 then cidx = cidx + 1 end
if cidx > #p.roygbiv then cidx = #p.roygbiv end
color = colorTable(p.roygbiv[cidx])

local tidx = mod(jf+1, #p.roygbiv)+1
if mod(tidx, 2) == 1 then tidx = tidx + 1 end
if tidx > #p.roygbiv then tidx = cidx end
local tcolor = colorTable(p.roygbiv[tidx])

color = colorMix(color, tcolor, mod(j, 1))
end
local subdued = nil
if args.theme then
subdued = args.theme:match("^subdued(%d+)%%$")
end
if subdued then
color = colorMix(color, black, tonumber(subdued) / 100)
end
assert(color)
if args.bg ~= "y" then
local rgba = colorAsRGBA(color)
ret = (ret .. "<span style='" .. (args.bg == "black" and "background-color:black;" or "")
.. "color:" .. rgba .. ";'>" .. c .."</span>")
else
local rgba = colorAsRGBA(args.fgcolor and colorTable(args.fgcolor:sub(2, -1)) or black)
ret = (ret .. "<span style='background-color:" .. colorAsRGBA(color) .. ";"
.. "color:" .. rgba .. "'>" .. c .."</span>")
end
i = i + 1
end

return ret
end

return p

Module:Rainbow - Revision history

Psiĥedelisto: Implements Template:Rainbow