Module:GetParameters

Usage

getParameters

Takes 2 required arguments, frame_args and arg_list. Parses a frame's arguments, returning either the provided named arguments in arg_list if found or the positional parameters instead if not. This is designed to work around the stripping of values that takes place for defined parameters which could be important.

As an example, the calls getParameters({"a", "b", "c"}, {"x", "y"}) and getParameters({x="a", y="b", z="c"}, {"x", "y"}) would both give back {x="a", y="b"}.

getBoolean

Takes 1 required argument boolean_str. Turns the input into a true/false boolean value based on the input. Will error if given anything other than a string or boolean value.

defined

To be invoked from inside a template instead of a module. Determines if a certain parameter is defined in the parent frame's arguments.

See also

• Module:Arguments

---

local p = {}

--[[
Helper function that populates the argument list given that user may need to use a mix of
named and unnamed parameters.  This is relevant because named parameters are not
identical to unnamed parameters due to string trimming, and when dealing with strings
we sometimes want to either preserve or remove that whitespace depending on the application.
]]
function p.getParameters( frame_args, arg_list )
    local new_args = {};
    local index = 1;
    local value;
    
    for i,arg in ipairs( arg_list ) do
        value = frame_args[arg]
        if value == nil then
            value = frame_args[index];
            index = index + 1;
        end
        new_args[arg] = value;
    end
    
    return new_args;
end        

--[[
Helper Function to interpret boolean strings
]]
function p.getBoolean( boolean_str )
    local boolean_value;
    
    if type( boolean_str ) == 'string' then
        boolean_str = boolean_str:lower();
        if boolean_str == 'false' or boolean_str == 'no' or boolean_str == '0' 
                or boolean_str == '' then
            boolean_value = false;
        else
            boolean_value = true;
        end    
    elseif type( boolean_str ) == 'boolean' then
        boolean_value = boolean_str;
    else
        error( 'No boolean value found' );
    end    
    return boolean_value
end

function p.defined(frame)
	local arg = mw.text.trim(frame.args[1])
	--if arg == tostring(tonumber(arg)) then -- undesired result for '-0'
	--	arg = tonumber(arg)
	--end
	--if mw.ustring.find(arg, '^%s*-?[1-9][0-9]*%s*$') ~= nil or arg == '0' then
	--	arg = tonumber(arg)
	--end
	if mw.ustring.find(arg, '^-?[1-9][0-9]*$') ~= nil then
		arg = tonumber(arg)
	elseif arg == '0' then
		arg = 0
	end
	return frame:getParent().args[arg] ~= nil
end

return p