Module:Domain handler

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p.getTopLevelDomain(frame)

This function is designed to retrieve the top-level domain of a redirect.

The function accepts two parameters from a template. The parameters are |domain= (the TLD provided manually, optional) and |context= (determines which category to check based on if it is set to "domains" or "URLs", defaults to "domains").

If a TLD is passed using the |domain= parameter, the function makes a few changes to it. It trims any leading/trailing spaces, converts it to lowercase and ensures it starts with a period.

Two category names with this TLD are then constructed. These categories are Category:Redirects from <domain> domain names or Category:Redirects from <domain> URLs, depending on the value of context.

The function then checks if the category actually exists. If it does, the TLD with a leading space is returned. If it does not, the function falls back upon automatic detection.

If no domain is provided or the constructed category does not exist, the function analyzes the current page title. It first lowercases it, strips the protocol part of the URL (e.g., https://) and keeps the rest. From the new string, the function extracts everything before the first slash as the domain part.

It then tries to extract the TLD using a simple pattern matching approach, looking for the last sequence of characters following a period (e.g., .com, .org).

If a TLD is found, the function then does the same category check as above.

If the category exists, the TLD with a leading space is returned. If it does not exist, the function returns an empty string.

p.adjustTitleCapitalization(frame)

This function adjusts the capitalization of the current page title.

The function first retrieves the current page title.

The function accepts |lowercase= parameter from a template. If the |lowercase= parameter is set to "yes", it returns the title with the first letter in lowercase and the rest unchanged. If the |lowercase= parameter is set to "no", it simply returns the title unchanged. If the |lowercase= parameter is not specified or any other value, it checks if any character after the first one in the title is uppercase. If uppercase characters are found, it keeps the title unchanged. If no uppercase characters are found, it returns the title with the first letter in lowercase.

This module is used in the templates {{R from URL}} and {{R from domain name}}.

Usage

{{#invoke:Domain handler|getTopLevelDomain}}

{{#invoke:Domain handler|adjustTitleCapitalization}}

The above documentation is transcluded from Module:Domain handler/doc. (edit | history)
Editors can experiment in this module's sandbox (edit | diff) and testcases (create) pages.
Subpages of this module.

local p = {}

function p.getTopLevelDomain(frame)
    local args = frame.args
    local domain = args.domain or args[1]
    local context = args.context or "domains"

    if domain and domain ~= "" then
        domain = mw.text.trim(domain):lower()
        domain = "." .. domain:gsub("^%.", "")

        local category = "Category:Redirects from " .. domain ..
                         (context == "domains" and " domain names" or " URLs")

        if mw.title.new(category).exists then
            return " " .. domain
        end
    end

    local currentTitle = mw.title.getCurrentTitle().text
    currentTitle = currentTitle:lower():gsub("^https?://", "")
    currentTitle = currentTitle:match("^([^/]+)") or currentTitle

    local topLevelDomain = currentTitle:match("(%.[^.]+)$")

    if topLevelDomain then
        topLevelDomain = topLevelDomain
        local category = "Category:Redirects from " .. topLevelDomain ..
                         (context == "domains" and " domain names" or " URLs")

        if mw.title.new(category).exists then
            return " " .. topLevelDomain
        end
    end

    return ""
end

function p.adjustTitleCapitalization(frame)
    local title = mw.title.getCurrentTitle().text
    local lowercaseParameter = (frame.args.lowercase or ""):lower()

    if lowercaseParameter == "yes" then
        return title:sub(1,1):lower() .. title:sub(2)
    end
    if lowercaseParameter == "no" then
        return title
    end

    return title:sub(2):find("%u") and title or title:sub(1,1):lower() .. title:sub(2)
end

return p