Module:Tree chart

require('Dev:No globals') local p = {} local cells = mw.loadData('Module:Tree chart/data') function p._main(cell_args) local ret = mw.html.create local top = ret:tag('tr') :css{ height = '1px', ['text-align'] = 'center' } local bottom = ret:tag('tr') :css{ height = '1px', ['text-align'] = 'center' } for _, v in ipairs(cell_args) do        if type(v) == 'string' then top:wikitext(cells[v].t)            bottom:wikitext(cells[v].b)         else top:tag('td') :attr{ colspan = v.colspan or cell_args.colspan or 6, rowspan = v.rowspan or cell_args.rowspan or 2 } :css{ padding = '0.2em', border = (v.border or cell_args.border or '2') .. 'px solid black' } :cssText(v.boxstyle or cell_args.boxstyle) :wikitext(v.text) end end return tostring(ret) end function p.main(frame) local args = require('Dev:Arguments').getArgs(frame, {wrappers = 'Template:Tree chart', trim = false, removeBlanks = false}) local cell_args = { colspan = args.colspan, rowspan = args.rowspan, border = args.border, boxstyle = args.boxstyle }    for _, val in ipairs(args) do         local trimmedVal = val:match('^%s*(.-)%s*$') if trimmedVal == '' then trimmedVal = '$' end if cells[trimmedVal] then table.insert(cell_args, trimmedVal) else -- Unnamed params behave weirdly -- white space at the front counts for param_, but not whitespace at the end, so remove it            local rightTrimmedVal = val:gsub('%s+$','') table.insert(cell_args, {                text = args[trimmedVal] or (''),                 colspan = args['colspan_'..rightTrimmedVal],                 rowspan = args['rowspan_'..rightTrimmedVal],                 border = args['border_'..rightTrimmedVal],                 boxstyle = args['boxstyle_'..rightTrimmedVal]             }) end end return p._main(cell_args) end return p