Module:Common

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

local common = {}

--- Convert an input to number
--- @param num string|integer Input
--- @param onFail string|integer Output if conversion fails
--- @param base integer Base for tonumber, defaults to 10
--- @return number
function common.toNumber( num, onFail, base )
	base = base or 10

    if num == nil then
        return onFail
    end

	local numCopy = num
    if type( num ) == 'string' then
        numCopy = num:gsub( ',', '.' )
    end

    numCopy = tonumber( numCopy, base )

    if numCopy == nil then
        return onFail
    end

    return numCopy
end

--- Formats a number according to the content language
--- @param num number|string
function common.formatNum( num, onFail )
    local converted = common.toNumber( num, false )

    if converted == nil or converted == false then
    	return onFail or false
	end

    local converted = mw.language.getContentLanguage():formatNum( converted )

    return mw.ustring.gsub( converted, '−', '-' )
end

--- Removes (...) suffixes
--- @param pageName string
--- @param suffix string|table
function common.removeTypeSuffix( pageName, suffix )
    if type( suffix ) == 'table' then
        for _, toRemove in pairs( suffix ) do
            pageName = common.removeTypeSuffix( pageName, toRemove )
        end

        return pageName
    end

    return mw.text.trim( pageName:gsub( '%(' .. suffix .. '%)', '' ), '_ ' )
end

--- Create interwiki links for a given title
--- @param pageName string
function common.generateInterWikiLinks( pageName )
	if pageName == nil or #pageName == '' then
		return ''
	end

	local prefixes = { 'de', 'hu', 'zh' }
	local suffixes = {}

	local out = ''

	for _, prefix in pairs( prefixes ) do
		local page = common.removeTypeSuffix( pageName, suffixes )
		out = out .. string.format( '[[%s:%s]]', prefix, page )
	end
	
	return out
end

--- Checks if Setting SMW Data was successful
--- @param result table
function common.checkSmwResult( result )
	if result == nil then
        return
	end

    if result ~= true and result.error ~= nil then
        error( 'Semantic Mediawiki error ' .. result.error )
    end
end

--- Checks if Api Request was successful and if the Response is valid
--- @param response table
--- @param errorOnData boolean
--- @param errorOnData boolean
--- @return boolean
function common.checkApiResponse( response, errorOnStatus, errorOnData )
    if response[ 'status_code' ] ~= nil and response[ 'status_code' ] ~= 200 then
        if errorOnStatus == nil or errorOnStatus == true then
            error( 'API request returns the error code ' .. response[ 'status_code' ] .. '(' .. response[ 'message' ] .. ')', 0 )
        end
        return false
    end

    if response[ 'data' ] == nil then
        if errorOnData == nil or errorOnData == true then
            error( 'API data does not contain a "data" field', 0 )
        end
        return false
    end
    return true
end

--- Walks a table in order, can be used like pairs()
--- @param t table
--- @param order function - Sorting function OPTIONAL
function common.spairs( t, order )
    -- collect the keys
    local keys = {}
    for k in pairs(t) do keys[#keys+1] = k end

    -- if order function given, sort by it by passing the table and keys a, b,
    -- otherwise just sort the keys
    if order then
        table.sort(keys, function(a,b) return order(t, a, b) end)
    else
        table.sort(keys)
    end

    -- return the iterator function
    local i = 0
    return function()
        i = i + 1
        if keys[i] then
            return keys[i], t[keys[i]]
        end
    end
end

return common