Editing Module:Sandbox/Gadget850/Echo

local str = {}

---------------------------------------------------
--  Function: echo
--
--  This function returns the contents of the target string.
--
--  Usage:
--      {{#invoke:Echo|echo|target_string|}}
--      OR
--      {{#invoke:Echo|echo|s=target_string}}
--
-- Parameters
--      s: The string whose contents to display
--
--  If invoked using named parameters, Mediawiki will automatically
--  remove any leading/trailing whitespace from the target string.  
 
function str.echo( frame )
    local new_args = str._getParameters( frame.args, {'s'} );
    local s = new_args['s'] or '';
    return s
end

---------------------------------------------------
--  Function: table
--
--  This function returns a test table in wikimarkup.

function str.table( frame )
    local str = [[{| class="wikitable"
|-
! Header text !! Header text !! Header text
|-
| Example || Example || Example
|-
| Example || Example || Example
|-
| Example || Example || Example
|}]]

end

-----------------------------------------
--  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,
--  there can be a need to either preserve or remove that whitespace
--  depending on the application.
 
function str._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
 
return str