Difference between revisions of "Module:Infobox"

Revision as of 03:50, 4 June 2013

--
-- This module implements {{Infobox}}
--
 
local p = {}
 
local HtmlBuilder = require('Module:HtmlBuilder')
 
local args
local root
 
function union(t1, t2)
    -- Returns the union of the values of two tables, as a sequence.
    local vals = {}
    for k, v in pairs(t1) do
        vals[v] = true
    end
    for k, v in pairs(t2) do
        vals[v] = true
    end
    local ret = {}
    for k, v in pairs(vals) do
        table.insert(ret, k)
    end
    return ret
end

local function getArgNums(prefix)
    -- Returns a table containing the numbers of the arguments that exist
    -- for the specified prefix. For example, if the prefix was 'data', and
    -- 'data1', 'data2', and 'data5' exist, it would return {1, 2, 5}.
    local nums = {}
    for k, v in pairs(args) do
        local num = tostring(k):match('^' .. prefix .. '([1-9]%d*)$')
        if num then table.insert(nums, tonumber(num)) end
    end
    table.sort(nums)
    return nums
end

local function addRow(rowArgs)
    -- Adds a row to the infobox, with either a header cell
    -- or a label/data cell combination.
    if rowArgs.header then
        root
            .tag('tr')
                .tag('th')
                    .attr('colspan', 2)
                    .addClass(rowArgs.class)
                    .css('text-align', 'center')
                    .cssText(args.headerstyle)
                    .wikitext(rowArgs.header)
    elseif rowArgs.data then
        local row = root.tag('tr')
        row.addClass(rowArgs.rowclass)
        if rowArgs.label then
            row
                .tag('th')
                    .attr('scope', 'row')
                    .css('text-align', 'left')
                    .cssText(args.labelstyle)
                    .wikitext(rowArgs.label)
                    .done()
        end
        
        local dataCell = row.tag('td')
        if not rowArgs.label then 
            dataCell
                .attr('colspan', 2)
                .css('text-align', 'center') 
        end
        dataCell
            .addClass(rowArgs.class)
            .cssText(rowArgs.datastyle)
            .wikitext(rowArgs.data)
    end
end

local function renderTitle()
    if not args.title then return end

    root
        .tag('caption')
            .addClass(args.titleclass)
            .cssText(args.titlestyle)
            .wikitext(args.title)
end

local function renderAboveRow()
    if not args.above then return end
    
    root
        .tag('tr')
            .tag('th')
                .attr('colspan', 2)
                .addClass(args.aboveclass)
                .css('text-align', 'center')
                .css('font-size', '125%')
                .css('font-weight', 'bold')
                .cssText(args.abovestyle)
                .wikitext(args.above)
end

local function renderBelowRow()
    if not args.below then return end
    
    root
        .tag('tr')
            .tag('td')
                .attr('colspan', '2')
                .addClass(args.belowclass)
                .css('text-align', 'center')
                .cssText(args.belowstyle)
                .newline()
                .wikitext(args.below)
                .newline()
end

local function renderSubheaders()
    if args.subheader then
        args.subheader1 = args.subheader
    end
    if args.subheaderrowclass then
        args.subheaderrowclass1 = args.subheaderrowclass
    end
    local subheadernums = getArgNums('subheader')
    for k, num in ipairs(subheadernums) do
        addRow({
            data = args['subheader' .. num],
            datastyle = args.subheaderstyle or args['subheaderstyle' .. num],
            class = args.subheaderclass,
            rowclass = args['subheaderrowclass' .. num]
        })
    end
end

local function renderImages()
    if args.image then
        args.image1 = args.image
    end
    if args.caption then
        args.caption1 = args.caption
    end
    local imagenums = getArgNums('image')
    for k, num in ipairs(imagenums) do
        local caption = args['caption' .. num]
        local data = HtmlBuilder.create().wikitext(args['image' .. num])
        if caption then
            data
                .tag('br', {selfClosing = true})
                    .done()
                .tag('span')
                    .cssText(args.captionstyle)
                    .wikitext(caption)
        end
        addRow({
            data = tostring(data),
            datastyle = args.imagestyle,
            class = args.imageclass,
            rowclass = args['imagerowclass' .. num]
        })
    end
end

local function renderRows()
    -- Gets the union of the header and data argument numbers,
    -- and renders them all in order using addRow.
    local rownums = union(getArgNums('header'), getArgNums('data'))
    table.sort(rownums)
    for k, num in ipairs(rownums) do
        addRow({
            header = args['header' .. num],
            label = args['label' .. num],
            data = args['data' .. num],
            datastyle = args.datastyle,
            class = args['class' .. num],
            rowclass = args['rowclass' .. num]
        })
    end
end

local function renderNavBar()
    if not args.name then return end
    
    root
        .tag('tr')
            .tag('td')
                .attr('colspan', '2')
                .css('text-align', 'right')
                .wikitext(mw.getCurrentFrame():expandTemplate({ 
                    title = 'navbar', 
                    args = { args.name, mini = 1 }
                }))
end

local function renderItalicTitle()
    local italicTitle = args['italic title'] and mw.ustring.lower(args['italic title'])
    if italicTitle == '' or italicTitle == 'force' or italicTitle == 'yes' then
        root.wikitext(mw.getCurrentFrame():expandTemplate({title = 'italic title'}))
    end
end

local function renderTrackingCategories()
    if args.decat ~= 'yes' then
        if #(getArgNums('data')) == 0 and mw.title.getCurrentTitle().namespace == 0 then
            root.wikitext('[[Category:Articles which use infobox templates with no data rows]]')
        end
        if args.child == 'yes' and args.title then
            root.wikitext('[[Category:Articles which use embedded infobox templates with the title parameter]]')
        end
    end
end

local function _infobox()
    -- Specify the overall layout of the infobox, with special settings
    -- if the infobox is used as a 'child' inside another infobox.
    if args.child ~= 'yes' then
        root = HtmlBuilder.create('table')
        
        root
            .addClass('infobox')
            .addClass(args.bodyclass)
            .attr('cellspacing', 3)
            .css('border-spacing', '3px')
            
            if args.subbox == 'yes' then
                root
                    .css('padding', '0')
                    .css('border', 'none')
                    .css('margin', '-3px')
                    .css('width', 'auto')
                    .css('min-width', '100%')
                    .css('font-size', '100%')
                    .css('clear', 'none')
                    .css('float', 'none')
                    .css('background-color', 'transparent')
            else
                root
                    .css('width', '22em')
            end
        root
            .cssText(args.bodystyle)
    
        renderTitle()
        renderAboveRow()
    else
        root = HtmlBuilder.create()
    end

    renderSubheaders()
    renderImages() 
    renderRows() 
    renderBelowRow()  
    renderNavBar()
    renderItalicTitle()
    renderTrackingCategories()
    
    return tostring(root)
end

local function touchParameters(prefixTable, origArgs, step)
    -- Parse the parameters with the given prefixes, in order, in batches 
    -- of the step size specified. This is to prevent references etc. from
    -- appearing in the wrong order.
    if type(prefixTable) ~= 'table' or type(origArgs) ~= 'table' then
        error("Invalid input to the touchParameters function detected. Both parameters must be tables.", 2)
    end
    if step and type(step) ~= 'number' then
        error("Non-numerical step value detected.", 2)
    end
    
    step = step or 20 -- If the step size is not given, the default is 20.
    local temp
    local a = 1 -- Counter variable.
    local moreArgumentsExist = true
    for j,v in ipairs(prefixTable) do
        if not type(v) == "string" then
            error("Non-string value detected in the prefix table in the touchParameters function.", 2)
        end
        temp = origArgs[v]
    end
    while moreArgumentsExist == true do
        moreArgumentsExist = false
        for i = a, a + step - 1 do
            for j,v in ipairs(prefixTable) do
                temp = origArgs[v .. tostring(i)]
                if temp then
                    moreArgumentsExist = true
                end
            end
        end
        a = a + step
    end
end
 
function p.infobox(frame)
    local origArgs
    -- If called via #invoke, use the args passed into the invoking template.
    -- Otherwise, for testing purposes, assume args are being passed directly in.
    if frame == mw.getCurrentFrame() then
        origArgs = frame:getParent().args
    else
        origArgs = frame
    end
    
    -- Parse the data parameters in the same order that the old {{infobox}} did, so that
    -- references etc. will display in the expected places.
    local temp
    temp = origArgs.title
    temp = origArgs.above
    touchParameters({'subheader'}, origArgs, 5)
    touchParameters({'image', 'caption'}, origArgs, 5)
    touchParameters({'header', 'label', 'data'}, origArgs, 20)
    temp = origArgs.below
 
    -- ParserFunctions considers whitespace to be false, so to preserve the previous 
    -- behavior of {{infobox}}, change any whitespace arguments to nil, so Lua will consider
    -- them false too. (Except the 'italic title' param, which specifies different behavior
    -- depending on whether it's absent or empty)
    args = {}
    for k, v in pairs(origArgs) do
        if mw.ustring.match(v, '%S') or k == 'italic title' then
            args[k] = v
        end
    end
 
    return _infobox()
end
 
return p