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Module:InfoboxImage/sandbox

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-- Inputs:
--    image - Can either be a bare filename (with or without the File:/Image: prefix) or a fully formatted image link
--    page - page to display for multipage images (DjVu)
--    size - size to display the image
--    maxsize - maximum size for image
--    sizedefault - default size to display the image if size param is blank
--    alt - alt text for image
--    title - title text for image
--    border - set to yes if border
--    center - set to yes, if the image has to be centered
--    upright - upright image param
--    suppressplaceholder - if yes then checks to see if image is a placeholder and suppresses it
--    link - page to visit when clicking on image
--    class - HTML classes to add to the image
-- Outputs:
--    Formatted image.
-- More details available at the "Module:InfoboxImage/doc" page

local i = {}

-- Constants:
--    the system-wide default thumbnail size (in px)
local defaultThumbnailSize = 250

-- Optimization: Cache all valid File namespace names and aliases once on module load
local fileNamespaces = {}
do
    local ns6 = mw.site.namespaces[6]
    table.insert(fileNamespaces, mw.ustring.lower(ns6.name))
    table.insert(fileNamespaces, mw.ustring.lower(ns6.canonicalName))
    for _, alias in ipairs(ns6.aliases) do
        table.insert(fileNamespaces, mw.ustring.lower(alias))
    end
end

-- If page is not a user page, return tracking category. Else return empty.
-- Lazy evaluation of mw.loadData inside the function to minimize parsing overhead
local function trackingCat(catKey)
    local ns = mw.title.getCurrentTitle().nsText:lower()
    if ns == 'user' or ns == 'user talk' then return "" end
    
    local categories = mw.loadData('Module:InfoboxImage/data/sandbox').categories
    return categories[catKey] or ""
end

-- Internal helper to strip file namespace prefixes from the image string
local function stripNamespace(imageName)
    imageName = mw.ustring.gsub(imageName, '^[ ]*(.-)[ ]*$', '%1')
    for _, name in ipairs(fileNamespaces) do
        local prefixLen = mw.ustring.len(name) + 1
        if mw.ustring.lower(mw.ustring.sub(imageName, 1, prefixLen)) == name .. ":" then
            imageName = mw.ustring.sub(imageName, prefixLen + 1)
            break
        end
    end
    return mw.ustring.gsub(imageName, '^[ ]*(.-)[ ]*$', '%1')
end

-- Determine whether image is a placeholder
function i.IsPlaceholder(image)
    -- change underscores to spaces
    image = mw.ustring.gsub(image, "_", " ")
    
    -- if image starts with [[ then remove that and anything after |
    if mw.ustring.sub(image,1,2) == "[[" then
        image = mw.ustring.sub(image,3)
        image = mw.ustring.gsub(image, "([^|]*)|.*", "%1")
    end
    
    -- Trim spaces and strip prefix if exists
    image = stripNamespace(image)
    
    -- capitalise first letter
    image = mw.ustring.upper(mw.ustring.sub(image,1,1)) .. mw.ustring.sub(image,2)

    -- Lazy load data map natively for O(1) performance lookup
    local placeholder_images = mw.loadData('Module:InfoboxImage/data/sandbox').placeholder_image
    return placeholder_images[image] or false
end

local function isempty(x)
    return (not x) or x == ""
end

-- Main entry point
function i.InfoboxImage(frame)
    local image = frame.args["image"]
    
    if isempty(image) then return "" end
    if image == " " then return image end
    
    if frame.args["suppressplaceholder"] ~= "no" then
        if i.IsPlaceholder(image) == true then return "" end
    end
    
    if string.find(image, "^%[*https?:") then
        -- Error category.
        return trackingCat("url_image_links")
    end

    if mw.ustring.sub(image,1,2) == "[[" then
        -- search for thumbnail images and add to tracking cat if found
        local cat = ""
        if mw.title.getCurrentTitle().namespace == 0 and (mw.ustring.find(image, "|%s*thumb%s*[|%]]") or mw.ustring.find(image, "|%s*thumbnail%s*[|%]]")) then
            cat = trackingCat("thumbnail_images")
        end
        return image .. cat
    elseif mw.ustring.sub(image,1,2) == "{{" and mw.ustring.sub(image,1,3) ~= "{{{" then
        return image
    elseif mw.ustring.sub(image,1,1) == "<" then
        return image
    elseif mw.ustring.sub(image,1,8) == mw.ustring.char(127).."'\"`UNIQ" then
        -- Found strip marker at begining, so pass don't process at all
        return image
    else
        local result = ""
        local page = frame.args["page"]
        local upright = frame.args["upright"] or ""
        local size = frame.args["size"]
        local maxsize = frame.args["maxsize"]
        local sizedefault = frame.args["sizedefault"]
        local alt = frame.args["alt"]
        local link = frame.args["link"]
        local title = frame.args["title"]
        local border = frame.args["border"]
        local thumbtime = frame.args["thumbtime"] or ""
        local center = frame.args["center"]
        local class = frame.args["class"]
        
        -- remove prefix if exists
        image = stripNamespace(image)
        
        if not isempty(maxsize) then
            -- if no sizedefault nor upright, then set to maxsize
            if isempty(sizedefault) and isempty(upright) then
                sizedefault = maxsize
            end
            -- check to see if size bigger than maxsize
            local maxsizenumber = tonumber(mw.ustring.match(maxsize,"%d*")) or 0
            if not isempty(size) then
                local sizenumber = tonumber(mw.ustring.match(size,"%d*")) or 0
                if sizenumber > maxsizenumber and maxsizenumber > 0 then
                    size = maxsize
                end
            end
            -- check to see if upright bigger than maxsize (at default preferred size)
            if not isempty(upright) then
                local uprightnumber = tonumber(upright) or (upright == "yes" and 0.75) or 0
                if uprightnumber*defaultThumbnailSize > maxsizenumber and maxsizenumber > 0 then
                    upright = tostring(maxsizenumber/defaultThumbnailSize)
                end
            end
        end
        
        -- add px to size if just a number
        if (tonumber(size) or 0) > 0 then size = size .. "px" end
        -- add px to sizedefault if just a number
        if (tonumber(sizedefault) or 0) > 0 then sizedefault = sizedefault .. "px" end
        
        result = "[[File:" .. image
        if not isempty(page) then result = result .. "|page=" .. page end
        
        if not isempty(size) then
            result = result .. "|" .. size
        elseif not isempty(sizedefault) and isempty(upright) then
            result = result .. "|" .. sizedefault
        else
            result = result .. "|frameless"
        end
        
        if center == "yes" then result = result .. "|center" end
        
        -- Safe Alt Validation (Checks keywords before appending to the output result string)
        if not isempty(alt) then
            if alt ~= "thumbnail" and alt ~= "thumb" and alt ~= "frameless" and alt ~= "left" and alt ~= "center" and alt ~= "right" and alt ~= "upright" and alt ~= "border" and mw.ustring.match(alt, '^[0-9]*px$', 1) == nil then
                result = result .. "|alt=" .. alt
            end
        end
        
        if not isempty(link) then result = result .. "|link=" .. link end
        if border == "yes" then result = result .. "|border" end
        
        if upright == "yes" then
            result = result .. "|upright"
        elseif upright ~= "" then
            result = result .. "|upright=" .. upright
        end
        if thumbtime ~= "" then result = result .. "|thumbtime=" .. thumbtime end
        if not isempty(class) then result = result .. "|class=" .. class end
        
        if not isempty(title) then
            -- does title param contain any templatestyles? If yes then set to blank.
            if mw.ustring.match(frame:preprocess(title), 'UNIQ%-%-templatestyles', 1) == nil then
                result = result .. "|" .. title
            end
        end
        result = result .. "]]"
        
        return result
    end
end

return i
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