# Module:Ahnentafel

---
-- implements Template:ahnentafel
---
local p = {}
-- templatestyles
local templatestyles = 'Ahnentafel/styles.css'
-- table of row pointers
local rows = {}
-- first and last indices in rows table
local rowbegin, rowend = -1,-1
-- tracking
local tcats = ''  
local function checkparameters(k)
if (k == 'align' or k == 'collapsed' or k == 'collapsible' or
k == 'title' or k == 'float' or k == 'clear' or k == 'ref' or
k == 'headnotes' or k == 'headnotes_align' or
k == 'footnotes' or k == 'footnotes_align' or k == 'rtl' or
k == 'width' or k == 'min-width' or k == 'text-align') then
return
end
if (k == 'boxstyle' or k == 'style' or k == '') then
tcats = tcats .. ''
return
end
if k:find('^boxstyle_[1-8]$') then
return
end
if k:find('^border_[1-8]$') then
return
end
k = mw.ustring.gsub(k, '[^%w\-_ ]', '?')
tcats = tcats .. ''
end  
local function addcell(r, rspan, cspan, t, s, c)
if ((r + rspan - 1) < rowbegin) or (r > rowend) then
-- completely out of range; do nothing
return
elseif r < rowbegin then
-- partially out of range, adjust
rspan = rspan - (rowbegin - r)
r = rowbegin
elseif (r + rspan - 1) > rowend then
-- partially out of range, adjust
rspan = rowend + 1 - r
end
if rspan > 0 then
rows[r]:tag('td')
:attr('rowspan', (rspan > 1) and rspan or nil)
:attr('colspan', (cspan > 1) and cspan or nil)
:cssText(s)
:addClass(c)
:wikitext(t)
end
end  
function p.chart
local getArgs = require('Module:Arguments').getArgs
local args = getArgs
local align = (args['align'] or ''):lower
local style = args['style'] or ''
local topbranch = 'ahnentafel-t'
local botbranch = 'ahnentafel-b'  
local yesno = require('Module:Yesno')  
if args['collapsed'] and args['collapsed'] ~= '' then
args['collapsible'] = 'yes'
end  
if args['title'] and args['title'] ~= '' then
args['collapsible'] = 'yes'
if yesno(args['collapsed'] or 'no') then
args['collapsed'] = 'yes'
else
args['collapsed'] = 'no'
end
end  
-- style for floating
if (align == '') then .. style
elseif (align == '') then .. style
elseif (align == '') then .. style
end  
-- compute the number of levels and track unsupported parameters
local maxnum = 0
for k, v in pairs( args ) do
if (k and type(k) == 'number' or
(type(k) == 'string' and (tonumber(k) or 0) > 0)) then
if tonumber(k) > maxnum then
maxnum = k
end
else
if (k and type(k) == 'string') then
checkparameters(k)
end
end
end  
-- limit the number of levels
maxnum = (maxnum > 511) and 511 or maxnum  
local levels = math.ceil(math.log(maxnum+1)/math.log(2))
local cells = math.pow(2, levels) - 1  
-- "fill in" missing boxes
for k=cells,2,-1 do
local j = math.floor(k/2)
if args[k] and args[k] ~= '' then
if args[j] == nil or args[j] == '' then
args[j] = ' ' -- single space
end
end
end  
-- compute the first and last row number
rowbegin = 2*cells+1
rowend = 2*cells+2
local cellnum = 0
for l = 1,levels do
local cellsk = math.pow(2,l-1)
local offset = 1
for k = 1,cellsk do
cellnum = cellnum + 1
offset = offset + 2*(math.pow(2,levels-l+1)-1)
if args[cellnum] and args[cellnum] ~= '' then
rowbegin = (offset < rowbegin) and offset or rowbegin
rowend = ((offset+1) > rowend) and (offset+1) or rowend
end
if args[cellnum] and args[cellnum] == '' then
args[cellnum] = nil
end
offset = offset + 2*(math.pow(2,levels-l+1)-1) + 4
end
end  
-- add a collapsing outer container if required
local res = mw.html.create('')
local innercell = res
local innerfs = '88%'
if yesno(args['collapsible'] or 'no') then
local r = res:tag('table')
local t = args['title'] or ('முன்னோர்கள்: ' .. mw.title.getCurrentTitle.text)
r:addClass('collapsible')
if yesno(args['collapsed'] or 'yes') then
r:addClass('collapsed')
end
local f = args['float'] or ''
if f == '' then
r:css('margin', '0.3em 1em 0.3em 0')
r:css('float', '')
r:css('clear', args['clear'] or '')
r:css('min-width', args['min-width'] or args['width'] or '33em')
elseif f == '' then
r:css('margin', '0.3em 0 0.3em 1em')
r:css('float', '')
r:css('clear', args['clear'] or '')
r:css('min-width', args['min-width'] or args['width'] or '33em')
elseif f == '' then
r:css('margin', '0.3em 0')
r:css('min-width', args['min-width'] or args['width'] or '60em')
else
r:css('margin', '0.3em auto')
r:css('clear', args['clear'] or '')
r:css('min-width', args['min-width'] or args['width'] or '60em')
end
r:css('width', args['width'] or 'auto')
r:css('font-size', '88%')
r:css('', ' solid #aaa')
r:tag('tr'):tag('th')
:css('padding', '0.2em 0.3em 0.2em 4.3em')
:css('background', '')
:css('width', args['width'] or 'auto')
:wikitext(t .. (args['ref'] or ''))
innercell = r:tag('tr'):tag('td')
:css('text-align', args['text-align'] or '')
innerfs = nil
args['ref'] = nil
end  
-- add content before the table if required
if args['headnotes'] then
if args['headnotes_align'] then
innercell:tag('div')
:css('width','100%')
:css('text-align',args['headnotes_align'])
:wikitext(args['headnotes'])
else
innercell:wikitext(args['headnotes'])
end
end  
-- build the inner table
local root = innercell:tag('table')
root:addClass('ahnentafel')
:css('font-size', innerfs)
:cssText(style)  
-- initialize the rows with 1 by 1 blank cells
for k = rowbegin, (rowend+1) do
rows[k] = root:tag('tr')
rows[k]:tag('td'):wikitext(' ')
end
-- add a blank row of cells to assist with alignment
for k = 1,(3*levels + 1) do
rows[rowend+1]:tag('td'):wikitext(' ')
end  
local cellnum = 0
for l = 1,levels do
local levelstyle = args['boxstyle_' .. l] or ''
if args['boxstyle'] and args['boxstyle'] ~= '' then
levelstyle = args['boxstyle'] .. ';' .. levelstyle
end
level .. levelstyle
level .. (args['border_' .. l] or args[''] or '1') .. 'px solid black;' .. levelstyle  
local cellsk = math.pow(2,l-1)
local offset = 1
for k = 1,cellsk do
cellnum = cellnum + 1
-- top padding
addcell(offset, 2*(math.pow(2,levels-l+1)-1), (l < levels) and 2 or 4, ' ', nil, nil)
-- top branch
if l < levels then
addcell(offset, math.pow(2,levels-l+1)-1, 1, ' ', nil, nil)
addcell(offset + math.pow(2,levels-l+1)-1, math.pow(2,levels-l+1)-1, 1, ' ', nil,
args[2*cellnum] and topbranch or nil)
end
offset = offset + 2*(math.pow(2,levels-l+1)-1)
-- cell
addcell(offset, 2, 4, args[cellnum] or ' ', args[cellnum] and levelstyle or nil, nil)
if l < levels then
addcell(offset, 2, 3 + 4*(levels - l - 1), ' ', nil, nil)
end
offset = offset + 2
-- bottom padding
addcell(offset, 2*(math.pow(2,levels-l+1)-1), (l < levels) and 2 or 4, ' ', nil, nil)
-- bottom branch
if l < levels then
addcell(offset, math.pow(2,levels-l+1)-1, 1, ' ', nil,
args[2*cellnum+1] and botbranch or nil)
addcell(offset + math.pow(2,levels-l+1)-1, math.pow(2,levels-l+1)-1, 1, ' ', nil, nil)
end
offset = offset + 2*(math.pow(2,levels-l+1)-1) + 2
end
end  
-- add content after the table if required
if args['footnotes'] or args['ref'] then
if args['footnotes_align'] then
innercell:tag('div')
:css('width','100%')
:css('text-align',args['footnotes_align'])
:wikitext(args['footnotes'])
else
innercell:wikitext(args['ref'])
innercell:wikitext(args['footnotes'])
end
end  
return :extensionTag{ name = 'templatestyles', args = { src = templatestyles} }
.. '<div>' .. tostring(res) .. '</div>' .. tcats
end  
return p