Module:Piechart/sandbox: Difference between revisions

Revision as of 20:33, 10 March 2025

Latest revision as of 19:16, 8 August 2025

(11 intermediate revisions by 2 users not shown)

Line 6:

-- require exact colors for printing

local forPrinting = "-webkit-print-color-adjust: exact; print-color-adjust: exact;"

--[===[

Smooth piechart module.

Draws charts in HTML with an accessible legend (optional).

A list of all features is in the "TODO" section of the main `p.pie` function.

Module info:

- Changelog and TODO: [[:en:User:Nux/pie_chart_-_todo]] (Piechart 1.0, 2.0 and beyond).

- Author: [[:en:User:Nux|Maciej Nux]].

Use with a helper template that adds required CSS.

Line 25 ⟶ 29:

{{{meta}}}:

{"size":200, "autoscale":false, "legend":true}

All meta options are optional (see `function p.setupOptions`).

]===]

-- Author: [[User:Nux|Maciej Nux]] (pl.wikipedia.org).

--[[

Line 79 ⟶ 83:

end

--[===[

Main pie chart function.

Piechart.

TODO (maybe):

[[:en:User:Nux/pie_chart_-_todo#Hopes_and_dreams]]

- [x] basic 2-element pie chart

]===]

- read json

- calculate value with -1

- generate html

- new css + tests

- provide dumb labels (just v%)

- [x] colors in json

- [x] 1st value >= 50%

- [x] custom labels support

- [x] pie size from 'meta' param (options json)

- [x] pl formatting for numbers?

- [x] support undefined value (instead of -1)

- [x] undefined in any order

- [x] scale values to 100% (autoscale)

- [x] order values clockwise (not left/right)

- [x] multi-cut pie

- [x] sanitize user values

- [x] auto colors

- [x] function to get color by number (for custom legend)

- [x] remember and show autoscaled data

- [x] generate a legend

- [x] simple legend positioning by (flex-)direction

- legend2: customization

- (?) itemTpl support

- replace default item with tpl

- can I / should I sanitize it?

- support for $v, $d, $p

- (?) custom head

- (?) validation of input

- check if required values are present

- message showing whole entry, when entry is invalid

- pre-sanitize values?

- sane info when JSON fails? Maybe dump JSON and show example with quotes-n-all...

- (?) option to sort entries by value

]]

function p.pie(frame)

local json_data = priv.trim(frame.args[1])

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-- footer below the labels

footer = "",

-- formatting template for labels

labelformat = "",

}

-- internals

options.style = ""

if user_options and user_options.meta then

local decodeSuccess, rawOptions = pcall(function()
return mw.text.jsonDecode(user_options.meta, mw.text.JSON_TRY_FIXING)

end)

if not decodeSuccess then

rawOptions = false

mw.log('invalid meta parameters')

end

if rawOptions then

if type(rawOptions.size) == "number" then

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if (type(rawOptions.footer) == "string") then

options.footer = rawOptions.footer

end

if (type(rawOptions.labelformat) == "string") then

options.labelformat = rawOptions.labelformat

end

end

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return options

end

-- internal for testing legend rendering

p.__priv.legendDebug = false

--[[

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]]

function p.renderPie(json_data, user_options)

if type(json_data) ~= "string" then

local data = mw.text.jsonDecode(json_data, mw.text.JSON_TRY_FIXING)

error('invalid piechart data type: '..type(json_data))

end

if #json_data < 2 then

error('piechart data is empty')

end

local decodeSuccess, data = pcall(function()

return mw.text.jsonDecode(json_data, mw.text.JSON_TRY_FIXING)

end)

-- Handle decode error

if not decodeSuccess then

error('invalid piechart data: '..json_data)

end

local options = p.setupOptions(user_options)

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if options.legend then

html = html .. p.renderLegend(data, options)

end

if p.__priv.legendDebug then

return html

end

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return html

end

function priv.boundaryFormatting(diff)

local value = 0.0

if diff <= 1.0 then

value = math.ceil(diff / 0.2) * 0.2 -- 0.2 step

else

value = math.ceil(diff / 0.5) * 0.5 -- 0.5 step

end

return string.format("%.1f", value)

end

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function priv.willAutoscale(sum)

-- Compare with a number larger then 100% to avoid floating-point precision problems

--- ...and data precision problems https://en.wikipedia.org/wiki/Template_talk:Pie_chart#c-PrimeHunter-20250420202500-Allow_percentage_sum_slightly_above_100

return sum - 100 > 1e-4

local diff = sum - 100

local grace = 1

return diff > grace

end

-- Tracking errors in data (note: somewhat expensive, similar to a red link)

-- In short: ±0.3 is a reasonable deviation; ±1 when the errors accumulate

-- https://en.wikipedia.org/wiki/Template_talk:Pie_chart#c-Nux-20250429152000-Nux-20250422224600

function priv.sumErrorTracking(sum, items)

local diff = sum - 100

if diff >= 0.4 and diff <= 10 then

local firstItem = items[1]

local lastItem = items[#items]

mw.addWarning("pie chart: Σ (value) = "..sum.."% ("..firstItem.value.." + .. .+ "..lastItem.value..")")

if mw.title.getCurrentTitle().namespace == 0 then

local suffix = priv.boundaryFormatting(diff)

_ = mw.title.new("Module:Piechart/tracing/diff below "..suffix).id

end

end

end

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-- prepare final label

entry.label = priv.prepareLabel(entryoptions.labellabelformat, entry)

-- background, but also color for MW syntax linter

entry.bcolor = priv.backColor(entry, no, total) .. ";color:#000"

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local bcolor = entry.bcolor

local html = "\n<li>"

if p.__priv.legendDebug then

forPrinting = ""

end

html = html .. '<span class="l-color" style="'..forPrinting..bcolor..'"></span>'

html = html .. '<span class="l-label">'..label..'</span>'

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local first = true

local previous = 0

local no = 0

local items = ""

local header = ""

for index, entry in ipairs(data) do

if not entry.error then

items = items .. priv.renderItem(previous, entry, options)

no = no + 1

if no == total then

header = priv.renderFinal(entry, options)

else

items = items .. priv.renderOther(previous, entry, options)

end

previous = previous + entry.value

end

end

local footer = '\n</div>'

local header = priv.renderHeader(options)

local footer = '\n<div class="smooth-pie-border"></div></div>'

return header, items, footer

end

-- header of pie-items (class="smooth-pie")

-- final, but header...

function priv.renderFinalrenderHeader(entry, options)

local labelbcolor = entry.label'background:#888;color:#000'

local bcolor = entry.bcolor

local size = options.size

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<div class="smooth-pie"

style="]]..style..[["

title="]]..p.extract_text(label)..[["

]]..aria..[[

>]]

return html

end

-- Render pie-item

-- any other then final

-- (previous is a sum of previous values)

function priv.renderOther(previous, entry, options)

function priv.renderItem(previous, entry, options)

local value = entry.value

local label = entry.label

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if (value < 0.03) then

mw.log('value too small', value, label)

mw.addWarning("pie chart: Value too small ↆ "..value.."% ("..label..")")

return ""

end

-- minimize transformation defects

if value < 10 then

if previous > 1 then

previous = previous - 0.01

end

value = value + 0.02

else

if previous > 1 then

previous = previous - 0.1

end

value = value + 0.2

end

-- force sum to be below 100% (needed due to value errors)

if previous + value > 100 then

if previous >= 100 then

mw.log('previous is already at 100', value, label)

return ""

end

value = 100 - previous

end

local html = ""

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end

-- translate value to turn rotation (v=100 => 1.0turn)

function priv.rotation(value)

if (value > 0.001) then

returnlocal f = string.format("transform: rotate(%.3fturn)7f", value / 100)

f = f:gsub("(%d)0+$", "%1") -- remove trailing zeros

return "transform: rotate("..f.."turn)"

end

return ''

Line 543 ⟶ 593:

Typical tpl:

"Abc$L: $v" (same as: "$label: $auto")

will result in:

"Abc: 23%" -- when values are percentages

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Advanced tpl:

"Abc$L: $d ($p)" --e.g. only"Abc: works1234 with(23%)" autoscalefor {"label":"Abc", "value":1234}

"$L: $v" is the same as above when values are autoscaled

Long vs short variable names:

$label ($L)

$auto ($v)

$value ($d)

$percent ($p)

]]

function priv.prepareLabel(tpl, entry)

-- staticsetup default tpl

if not tpl andor not string.find(tpl, '$')== "" then

-- simple if no label

return tpl

if not entry.label or entry.label == "" then

tpl = "$v"

else

if entry.label:find("%$[a-z]") then

tpl = entry.label

else

tpl = "$L: $v"

end

end

end

local labelLabel = entry.label and entry.label or priv.getLangOther()

-- format % value without %

local ppRaw = priv.formatNum(entry.value)

local pp = pRaw .. "%%"

local label = tpl

-- aliases

label = label

:gsub("%$label", "$L")

:gsub("%$auto", "$v")

:gsub("%$value", "$d")

:gsub("%$percent", "$p")

-- replace variables

label = label:gsub("%$L", labelLabel)

local d = priv.formatLargeNum(entry.raw and entry.raw or entry.value)

local v = entry.raw and (d .. " (" .. pp .. ")") or pp

label = label

:gsub("%$p", pp)

:gsub("%$d", d)

:gsub("%$v", v)

-- Report unknown variables

-- default template

for var in label:gmatch("%$[a-zA-Z]+") do

if not tpl then

tpl-- =in "$v"preview

mw.addWarning("pie chart: Unknown variable (wrong format of your label): " .. var)

end

-- tracing links

_ = mw.title.new("Module:Piechart/tracing/unknown-variable").id

local label = ""

if entry.raw then

local d = priv.formatLargeNum(entry.raw)

label = tpl:gsub("%$p", p .. "%%"):gsub("%$d", d):gsub("%$v", d .. " (" .. p .. "%%)")

else

label = tpl:gsub("%$v", p .. "%%")

end

return label

end

Line 602 ⟶ 683:

if (type(entry.color) == "string") then

-- Remove unsafe characters from entry.color

local sanitizedColor = entry.color:gsub("[^a-zA-Z0-9#%-]", "")

:gsub('&#35;', '#') -- workaround Module:Political_party issue reported on talk

:gsub("[^a-zA-Z0-9#%-]", "")

return 'background:' .. sanitizedColor

else

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function p.parseEnumParams(frame)

local args = frame:getParent().args

return priv.parseEnumParams(args)

end

function priv.parseEnumParams(args)

local result = {}

Line 741 ⟶ 827:

end

-- re-loop to set values in labels

local willAutoscale = priv.willAutoscale(sum)

for _, entry in ipairs(result) do

local label = entry.label

if label and not label:find("%$v[a-z]") then

-- autoscale will be forced, so use $v in labels

if priv.willAutoscale(sum) then

entry.label = label .. " $v"

else

entry.label = label .. " (" .. entry.value .. "%$p)"

end

end

end

-- tracking data errors

priv.sumErrorTracking(sum, result)

-- support other value mapping

local langlangOther = mwpriv.language.getContentLanguagegetLangOther()

local langOther = "Other"

if (lang:getCode() == 'pl') then

langOther = "Inne"

end

local colorOther = "#FEFDFD" -- white-ish for custom colors for best chance and contrast

Line 766 ⟶ 851:

otherValue = 0

end

local otherEntry = { label = (args["other-label"] or langOther) .. " ("..priv.formatNum(otherValue).."%$p)" }

if args["other-color"] and args["other-color"] ~= "" then

otherEntry.color = args["other-color"]

Line 783 ⟶ 868:

local jsonString = mw.text.jsonEncode(result)

return jsonString

end

function priv.getLangOther()

-- support other value mapping

local lang = mw.language.getContentLanguage()

if (lang:getCode() == 'pl') then

return "Inne"

end

return "Other"

end

Line 813 ⟶ 907:

-- explicit meta param

if args["meta"] then

local decodeSuccess, tempMeta = pcall(function()

meta = mw.text.jsonDecode(args["meta"], mw.text.JSON_TRY_FIXING)

return mw.text.jsonDecode(args["meta"], mw.text.JSON_TRY_FIXING)

end)

if not decodeSuccess then

mw.log('invalid meta parameter')

else

meta = tempMeta

end

end

Line 835 ⟶ 936:

if args["footer"] and args["footer"] ~= "" then

meta.footer = args["footer"]

end

if args["labelformat"] and args["labelformat"] ~= "" then

meta.labelformat = args["labelformat"]

end