whitelist = mw.loadData ('Module:Citation/CS1/Whitelist' .. sandbox);
utilities = require ('Module:Citation/CS1/Utilities' .. sandbox);
validation = require ('Module:Citation/CS1/Date_validation' .. sandbox);
identifiers = require ('Module:Citation/CS1/Identifiers' .. sandbox);
metadata = require ('Module:Citation/CS1/COinS' .. sandbox);
styles = 'Module:Citation/CS1' .. sandbox .. '/styles.css';  
utilities.set_selected_modules (cfg); -- so that functions in Utilities can see the selected cfg tables
identifiers.set_selected_modules (cfg, utilities); -- so that functions in Identifiers can see the selected cfg tables and selected Utilities module
validation.set_selected_modules (cfg, utilities); -- so that functions in Date validataion can see selected cfg tables and the selected Utilities module
metadata.set_selected_modules (cfg, utilities); -- so that functions in COinS can see the selected cfg tables and selected Utilities module  
z = utilities.z; -- table of error and category tables in Module:Citation/CS1/Utilities  
is_preview_mode = not utilities.is_set (:preprocess (''));  
local args = {}; -- table where we store all of the template's arguments
local suggestions = {}; -- table where we store suggestions if we need to loadData them
local error_text; -- used as a flag  
local config = {}; -- table to store parameters from the module
for k, v in pairs( .args ) do -- get parameters from the
config[k] = v;
-- args[k] = v; -- crude debug support that allows us to render a citation from module ; skips parameter validation; TODO: keep?
end  
local capture; -- the single supported capture when matching unknown parameters using patterns
local empty_unknowns = {}; -- sequence table to hold empty unknown params for error message listing
for k, v in pairs( pframe.args ) do -- get parameters from the parent (template)
v = mw.ustring.gsub (v, '^%s*(.-)%s*$', '%1'); -- trim leading/trailing whitespace; when v is only whitespace, becomes empty string
if v ~= '' then
if ('string' == type (k)) then
k = mw.ustring.gsub (k, '%d', cfg.date_names.local_digits); -- for enumerated parameters, translate 'local' digits to Western 0-9
end
if not validate( k, config.CitationClass ) then
if type (k) ~= 'string' then -- exclude empty numbered parameters
if v:match("%S+") ~= nil then
error_text = utilities.set_message ('err_text_ignored', {v});
end
elseif validate (k:lower, config.CitationClass) then
error_text = utilities.set_message ('err_parameter_ignored_suggest', {k, k:lower}); -- suggest the lowercase version of the parameter
else
if nil == suggestions.suggestions then -- if this table is nil then we need to load it
if is_sandbox then -- did the use sandbox version?
suggestions = mw.loadData( 'Module:Citation/CS1/Suggestions/sandbox' ); -- use the sandbox version
else
suggestions = mw.loadData( 'Module:Citation/CS1/Suggestions' ); -- use the live version
end
end
for pattern, param in pairs (suggestions.patterns) do -- loop through the patterns to see if we can suggest a proper parameter
capture = k:match (pattern); -- the whole match if no capture in pattern else the capture if a match
if capture then -- if the pattern matches
param = utilities.substitute (param, capture); -- add the capture to the suggested parameter (typically the enumerator)
if validate (param, config.CitationClass) then -- validate the suggestion to make sure that the suggestion is supported by this template (necessary for limited parameter lists)
error_text = utilities.set_message ('err_parameter_ignored_suggest', {k, param}); -- set the suggestion error message
else
error_text = utilities.set_message ('err_parameter_ignored', {k}); -- suggested param not supported by this template
v = ''; -- unset
end
end
end
if not utilities.is_set (error_text) then -- couldn't match with a pattern, is there an explicit suggestion?
if (suggestions.suggestions[ k:lower ] ~= nil) and validate (suggestions.suggestions[ k:lower ], config.CitationClass) then
utilities.set_message ('err_parameter_ignored_suggest', {k, suggestions.suggestions[ k:lower ]});
else
utilities.set_message ('err_parameter_ignored', {k});
v = ''; -- unset value assigned to unrecognized parameters (this for the limited parameter lists)
end
end
end
end  
args[k] = v; -- save this parameter and its value  
elseif not utilities.is_set (v) then -- for empty parameters
if not validate (k, config.CitationClass, true) then -- is this empty parameter a valid parameter
k = ('' == k) and '(empty string)' or k; -- when k is empty string (or was space(s) trimmed to empty string), replace with descriptive text
table.insert (empty_unknowns, utilities.wrap_style ('parameter', k)); -- format for error message and add to the list
end
-- crude debug support that allows us to render a citation from module TODO: keep?
-- elseif args[k] ~= nil or (k == 'postscript') then -- when args[k] has a value from (we don't normally do that)
-- args[k] = v; -- overwrite args[k] with empty string from pframe.args[k] (template ); v is empty string here
end -- not sure about the postscript bit; that gets handled in parameter validation; historical artifact?
end  
if 0 ~= #empty_unknowns then -- create empty unknown error message
utilities.set_message ('err_param_unknown_empty', {
1 == #empty_unknowns and '' or 's',
utilities.make_sep_list (#empty_unknowns, empty_unknowns)
});
end  
local url_param_t = {};  
for k, v in pairs( args ) do
if 'string' == type (k) then -- don't evaluate positional parameters
has_invisible_chars (k, v); -- look for invisible characters
end
has_extraneous_punc (k, v); -- look for extraneous terminal punctuation in parameter values
missing_pipe_check (k, v); -- do we think that there is a parameter that is missing a pipe?
args[k] = inter_wiki_check (k, v); -- when language interwiki-linked parameter missing leading colon replace with wiki-link label  
if 'string' == type (k) and not cfg.url_skip[k] then -- when parameter k is not positional and not in url skip table
url_param_t[k] = v; -- make a parameter/value list for extraneous url check
end
end  
has_extraneous_url (url_param_t); -- look for url in parameter values where a url does not belong  
return table.concat ({
:extensionTag ('templatestyles', '', {src=styles}),
citation0( config, args)
});
end  
----------------------------< E X P O R T E D F U N C T I O N S >------------------------------------------  
return {citation = citation};