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    Documentation for this module may be created at Module:InfoboxImage/doc

    -- 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 = {};
    
    local placeholder_image = {
        "Blue - Replace this image female.svg",
        "Blue - Replace this image male.svg",
        "Female no free image yet.png",
        "Flag of None (square).svg",
        "Flag of None.svg",
        "Flag of.svg",
        "Green - Replace this image female.svg",
        "Green - Replace this image male.svg",
        "Image is needed female.svg",
        "Image is needed male.svg",
        "Location map of None.svg",
        "Male no free image yet.png",
        "Missing flag.png",
        "No flag.svg",
        "No free portrait.svg",
        "No portrait (female).svg",
        "No portrait (male).svg",
        "Red - Replace this image female.svg",
        "Red - Replace this image male.svg",
        "Replace this image female (blue).svg",
        "Replace this image female.svg",
        "Replace this image male (blue).svg",
        "Replace this image male.svg",
        "Silver - Replace this image female.svg",
        "Silver - Replace this image male.svg",
        "Replace this image.svg",
    	"Cricket no pic.png",
    	"CarersLogo.gif",
    	"Diagram Needed.svg",
    	"Example.jpg",
    	"Image placeholder.png",
    	"No male portrait.svg",
    	"Nocover-upload.png",
    	"NoDVDcover copy.png",
    	"Noribbon.svg",
    	"No portrait-BFD-test.svg",
    	"Placeholder barnstar ribbon.png",
    	"Project Trains no image.png",
    	"Image-request.png",
    	"Sin bandera.svg",
    	"Sin escudo.svg",
    	"Replace this image - temple.png",
    	"Replace this image butterfly.png",
    	"Replace this image.svg",
    	"Replace this image1.svg",
    	"Resolution angle.png",
    	"Image-No portrait-text-BFD-test.svg",
    	"Insert image here.svg",
    	"No image available.png",
    	"NO IMAGE YET square.png",
    	"NO IMAGE YET.png",
    	"No Photo Available.svg",
    	"No Screenshot.svg",
    	"No-image-available.jpg",
    	"Null.png",
    	"PictureNeeded.gif",
    	"Place holder.jpg",
    	"Unbenannt.JPG",
    	"UploadACopyrightFreeImage.svg",
    	"UploadAnImage.gif",
    	"UploadAnImage.svg",
    	"UploadAnImageShort.svg",
    	"CarersLogo.gif",
    	"Diagram Needed.svg",
    	"No male portrait.svg",
    	"NoDVDcover copy.png",
    	"Placeholder barnstar ribbon.png",
    	"Project Trains no image.png",
    	"Image-request.png",
    	"Noimage.gif",
    }
    
    function i.IsPlaceholder(image)
        -- change underscores to spaces
        image = mw.ustring.gsub(image, "_", " ");
        assert(image ~= nil, 'mw.ustring.gsub(image, "_", " ") must not return nil')
        -- 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");
            assert(image ~= nil, 'mw.ustring.gsub(image, "([^|]*)|.*", "%1") must not return nil')
        end
        -- Trim spaces
        image = mw.ustring.gsub(image, '^[ ]*(.-)[ ]*$', '%1');
        assert(image ~= nil, "mw.ustring.gsub(image, '^[ ]*(.-)[ ]*$', '%1') must not return nil")
        -- remove prefix if exists
        local allNames = mw.site.namespaces[6].aliases
        allNames[#allNames + 1] = mw.site.namespaces[6].name
        allNames[#allNames + 1] = mw.site.namespaces[6].canonicalName
        for i, name in ipairs(allNames) do
            if mw.ustring.lower(mw.ustring.sub(image, 1, mw.ustring.len(name) + 1)) == mw.ustring.lower(name .. ":") then
                image = mw.ustring.sub(image, mw.ustring.len(name) + 2);
                break
            end
        end
        -- Trim spaces
        image = mw.ustring.gsub(image, '^[ ]*(.-)[ ]*$', '%1');
        -- capitalise first letter
        image = mw.ustring.upper(mw.ustring.sub(image,1,1)) .. mw.ustring.sub(image,2);
    
        for i,j in pairs(placeholder_image) do
            if image == j then
                return true
            end
        end
        return false
    end
    
    function i.InfoboxImage(frame)
        local image = frame.args["image"];
        
        if image == "" or image == nil 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 mw.ustring.lower(mw.ustring.sub(image,1,5)) == "http:" then
            return "";
        end
        if mw.ustring.lower(mw.ustring.sub(image,1,6)) == "[http:" then
            return "";
        end
        if mw.ustring.lower(mw.ustring.sub(image,1,7)) == "[[http:" then
            return "";
        end
        if mw.ustring.lower(mw.ustring.sub(image,1,6)) == "https:" then
            return "";
        end
        if mw.ustring.lower(mw.ustring.sub(image,1,7)) == "[https:" then
            return "";
        end
        if mw.ustring.lower(mw.ustring.sub(image,1,8)) == "[[https:" then
            return "";
        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 = "[[Category:Pages using infoboxes with 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,1,5) == mw.ustring.char(127).."UNIQ" then
            -- Found strip marker at begining, so pass don't process at all
            return image;
        elseif mw.ustring.sub(image,4,9) == "`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 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 upright = frame.args["upright"] or "";
            local thumbtime = frame.args["thumbtime"] or "";
            local center = frame.args["center"];
            local class = frame.args["class"];
            
            -- remove prefix if exists
            local allNames = mw.site.namespaces[6].aliases
            allNames[#allNames + 1] = mw.site.namespaces[6].name
            allNames[#allNames + 1] = mw.site.namespaces[6].canonicalName
            for i, name in ipairs(allNames) do
                if mw.ustring.lower(mw.ustring.sub(image, 1, mw.ustring.len(name) + 1)) == mw.ustring.lower(name .. ":") then
                    image = mw.ustring.sub(image, mw.ustring.len(name) + 2);
                    break
                end
            end
            
            if maxsize ~= "" and maxsize ~= nil then
                -- if no sizedefault then set to maxsize
                if sizedefault == "" or sizedefault == nil then
                    sizedefault = maxsize
                end
                -- check to see if size bigger than maxsize
                if size ~= "" and size ~= nil then
                    local sizenumber = tonumber(mw.ustring.match(size,"%d*")) or 0;
                    local maxsizenumber = tonumber(mw.ustring.match(maxsize,"%d*")) or 0;
                    if sizenumber>maxsizenumber and maxsizenumber>0 then
                        size = maxsize;
                    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 page ~= "" and page ~= nil then
                result = result .. "|page=" .. page;
            end
            if size ~= "" and size ~= nil then
                result = result .. "|" .. size;
            elseif sizedefault ~= "" and sizedefault ~= nil then
                result = result .. "|" .. sizedefault;
            else
                result = result .. "|frameless";
            end
            if center == "yes" then
                result = result .. "|center"
            end
            if alt ~= "" and alt ~= nil then
                result = result .. "|alt=" .. alt;
            end
            if link ~= "" and link ~= nil 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 class ~= nil and class ~= "" then
                result = result .. "|class=" .. class;
            end
            -- if alt value is a keyword then do not use as a description
            if alt == "thumbnail" or alt == "thumb" or alt == "frameless" or alt == "left" or alt == "center" or alt == "right" or alt == "upright" or alt == "border" or mw.ustring.match(alt or "", '^[0-9]*px$', 1) ~= nil then
                alt = nil;
            end
            if title ~= "" and title ~= nil 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
                    title = nil;
                end
            end
            if title ~= "" and title ~= nil then
                result = result .. "|" .. title;
            end
            result = result .. "]]";
            
            return result;
        end
    end
    
    return i;
    
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