Mô đun:Template wrapper

require('strict');

local error_msg = '&124;_template= thiếu hoặc trống';

------------------------------------------------------------------------------------

scan through tbl looking for value; return true if found, false else

local function is_in_table (tbl, value)
for k, v in pairs (tbl) do
if v == value then return true end
end
return false;
end

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adds parameter name and its value to args table according to the state of boolean list argument; kv pair for
template execution; k=v string for template listing.

local function add_parameter (k, v, args, list)
if list then
table.insert( args, table.concat ({k, '=', v})); -- write parameter names and values to args table as string
else
args[k] = v; -- copy parameters to args table
end
end

--[[------------------------------------------------------------------------------

returns a table of local template (parent frame) parameter names and the target template names that match where
in [key]= pairs where:
[key] is local template parameter name (an alias)
is target template parameter name (the canonical parameter name used in the working template)

The parameter |_alias-map= has the form:
|_alias-map=
where is a comma-separated list of alias / canonical parameter name pairs in the form
:
where:
is the local template's parameter name (alias)
is the target template's parameter name (canonical)
for enumerated parameters place an octothorp () where the enumerator digits are placed in the parameter names:
:

]]

local function alias_map_get (_alias_map)
local T = mw.text.split (_alias_map, '%s,%s'); -- convert the comma-separated list into a table of alias pairs
local mapped_aliases = {}; -- mapped aliases will go here
local l_name, t_name; -- parameter names

for _, alias_pair in ipairs (T) do -- loop through the table of alias pairs
l_name, t_name = alias_pair:match ('(.-)%s:%s(.+)'); -- from each pair, get local and target parameter names
if l_name and t_name then -- if both are set
if tonumber (l_name) then
l_name = tonumber (l_name); -- convert number-as-text to a number
end
mapped_aliases[l_name] = t_name; -- add them to the map table
end
end

return mapped_aliases;
end

--_template= parameter (name of the working template); nil else

local function frame_args_get (frame_args, args, list)
local template;

for k, v in pairs (frame_args) do -- here we get the wrapper template's 'default' parameters
if 'string' == type (k) and (v and ( ~= v)) then -- do not pass along positional or empty parameters
if '_template' == k then
template = v; -- save the name of template that we are wrapping
elseif '_exclude' ~= k and '_reuse' ~= k and '_include-positional' ~= k and '_alias-map' ~= k then -- these already handled so ignore here;
add_parameter (k, v, args, list); -- add all other parameters to args in the style dictated by list
end
end
end

return template; -- return contents of |_template= parameter
end

--[=[--------------------------------------------------------------------------

Fetches the wrapper template's 'live' parameters; adds live parameters that aren't members of the exclude table to
args table; positional parameters may not be excluded

no return value

]=]

local function pframe_args_get (pframe_args, args, exclude, _include_positional, list)
for k, v in pairs (pframe_args) do
if 'string' == type (k) and not is_in_table (exclude, k) then -- do not pass along excluded parameters
if v and ( ~= v) then -- pass along only those parameters that have assigned values
if 'unset' == v:lower() then -- special keyword to unset 'default' parameters set in the wrapper template
v = ; -- unset the value in the args table
end
add_parameter (k, v, args, list) -- add all other parameters to args in the style dictated by list; alias map only supported for local-template parameters
end
end
end

if _include_positional then
for i, v in ipairs (pframe_args) do -- pass along positional parameters
if 'unset' == v:lower() then -- special keyword to unset 'default' parameters set in the wrapper template
v = ; -- unset the value in the args table
end
add_parameter (i, v, args, list);
end
end
end

------------------------------------------------------------------------------------------------

Collect the various default and live parameters into args styled according to boolean list.

returns name of the working or listed template or nil for an error message

local function _main (frame, args, list)
local template;
local exclude = {}; -- table of parameter names for parameters that are not passed to the working template
local reuse_list = {}; -- table of pframe parameter names whose values are modified before they are passed to the working template as the same name
local alias_map = {}; -- table that maps parameter aliases to working template canonical parameter names
local _include_positional;

if frame.args._exclude and ( ~= frame.args._exclude) then -- if there is |_exclude= and it's not empty
exclude = mw.text.split (frame.args._exclude, "%s,%s"); -- make a table from its contents
end
-- TODO: |_reuse= needs a better name (|_reuse=)
if frame.args._reuse and ( ~= frame.args._reuse) then -- if there is |_reuse= and it's not empty
reuse_list = mw.text.split (frame.args._reuse, "%s,%s"); -- make a table from its contents
end

if frame.args['_alias-map'] and ( ~= frame.args['_alias-map']) then -- if there is |_alias-map= and it's not empty
alias_map = alias_map_get (frame.args['_alias-map']); -- make a table from its contents
end

template = frame_args_get (frame.args, args, list); -- get parameters provided in the
if nil template or template then -- this is the one parameter that is required by this module
return nil; -- not present, tell calling function to emit an error message
end

_include_positional = 'yes' == frame.args['_include-positional']; -- when true pass all positional parameters along with non-excluded named parameters to ...
-- ... the working template; positional parameters are not excludable

local _pframe_args = frame:getParent().args; -- here we get the wrapper template's 'live' parameters from pframe.args
local pframe_args = {}; -- a local table that we can modify

for k, v in pairs (_pframe_args) do -- make a copy that we can modify
pframe_args[k] = v;
end

-- here we look for pframe parameters that are aliases of canonical parameter names; when found
-- we replace the alias with the canonical. We do this here because the reuse_list works on
-- canonical parameter names so first we convert alias parameter names to canonical names and then
-- we remove those canonical names from the pframe table that are reused (provided to the working
-- template through the frame args table)

for k, v in pairs (alias_map) do -- k is alias name, v is canonical name
if pframe_args[k] then -- if pframe_args has parameter with alias name
pframe_args[v] = _pframe_args[k]; -- create new canonical name with alias' value
pframe_args[k] = nil; -- unset the alias
end
end

for k, v in pairs (pframe_args) do -- do enumerated parameter alias -> canonical translation
if 'string' == type (k) then -- only named parameters can be enumerated
if alias_map[k..''] then -- non-enumerated alias matches enumerated parameter pattern? enumerator at end only
pframe_args[alias_map[k..'']:gsub('', )] = v; -- remove '' and copy parameter to pframe_args table
pframe_args[k] = nil; -- unset the alias
elseif k:match ('%d+') then -- if this parameter name contains digits
local temp = k:gsub ('%d+', ''); -- make a copy; digits replaced with single ''
local enum = k:match ('%d+'); -- get the enumerator

if alias_map[temp] then -- if this parameter is a recognized enumerated alias
pframe_args[alias_map[temp]:gsub('', enum)] = v; -- use canonical name and replace '' with enumerator and add to pframe_args
pframe_args[k] = nil; -- unset the alias
end
end
end
end

-- pframe parameters that are _reused are 'reused' have the form something like this:
-- |chapter=}
-- where a parameter in the wrapping template is modified and then passed to the working template
-- using the same parameter name (in this example |chapter=)

-- remove parameters that will be reused
for k, v in ipairs (reuse_list) do -- k is numerical index, v is canonical parameter name to ignore
if pframe_args[v] then -- if pframe_args has parameter that should be ignored
pframe_args[v] = nil; -- unset the ignored parameter
end
end

pframe_args_get (pframe_args, args, exclude, _include_positional, list); -- add parameters and values to args that are not listed in the exclude table

return template; -- args now has all default and live parameters, return working template name
end

--------------------------------------------------------------------------------------------------

Template entry point. Call this function to 'execute' the working template

local function wrap (frame)
local args = {}; -- table of default and live parameters and their values to be passed to the wrapped template
local template; -- the name of the working template

template = _main (frame, args, false); -- get default and live parameters and the name of the working template
if not template then -- template name is required
return error_msg; -- emit error message and abandon if template name not present
end

return frame:expandTemplate {title=template, args=args}; -- render the working template
end

--------------------------------------------------------------------------------------------------

Template entry point. Call this function to 'display' the source for the working template. This function added
as a result of a TfD here: Wikipedia:Templates_for_discussion/Log/2018_April_28Module:PassArguments

This function replaces a similarly named function which was used in and

Values in the args table are numerically indexed strings in the form 'name=value'

local function list(frame, do_link)
local args = {}; -- table of default and live parameters and their values to be passed to the listed template
local template; -- the name of the listed template

template = _main (frame, args, true); -- get default and live parameters and the name of the listed template
if not template then -- template name is required
return error_msg; -- emit error message and abandon if template name not present
end
if do_link then
template = ('%s'):format(frame:expandTemplate{ title='Transclude', args = {template} }, template)
end
table.sort(args)
for i = 1, args do
local stripped = args[i]:match('^' .. i .. '=([^=])$')
if stripped then args[i] = stripped else break end
end
return frame:preprocess(table.concat({
'&123;&123;',
template,
('|%s'):rep(args):format(unpack(args)), '&125;&125;'})); -- render the template
end

local function link (frame)
return list(frame, true)
end

----------------------------------------------------------------------

return {
link = link,
list = list,
wrap = wrap,
};