require('strict')
local error_msg = '<span style=\"font-size:100%;\" class=\"error\"><code style=\"color:inherit; border:inherit; padding:inherit;\">|_template=</code> missing or empty</span>'
--[[----------------------< I S _ I N _ T A B L E >-----------------------------
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
--[[----------------------< A D D _ P A R A M E T E R >-------------------------
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
--[[----------------------< A L I A S _ M A P _ G E T >-------------------------
returns a table of local template (parent frame) parameter names and the target template names that match where
in [key]=<value> pairs where:
[key] is local template parameter name (an alias)
<value> is target template parameter name (the canonical parameter name used in the working template)
The parameter |_alias-map= has the form:
|_alias-map=<list>
where <list> is a comma-separated list of alias / canonical parameter name pairs in the form
<from> : <to>
where:
<from> is the local template's parameter name (alias)
<to> is the target template's parameter name (canonical)
for enumerated parameters place an octothorp (#) where the enumerator digits are placed in the parameter names:
<from#> : <to#>
]]
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
--[[----------------------< F R A M E _ A R G S _ G E T >-----------------------
Fetch the wrapper template's 'default' and control parameters; adds default parameters to args
returns content of |_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 type(k) == 'string' and (v and (v ~= '')) then -- do not pass along positional or empty parameters
if k == '_template' then
template = v -- save the name of template that we are wrapping
elseif k ~= '_exclude' and k ~= '_reuse' and k ~= '_include-positional' and k ~= '_alias-map' 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
--[=[---------------------< P F R A M E _ A R G S _ G E T >---------------------
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 type(k) == 'string' 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 v:lower() == 'unset' 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 v:lower() == 'unset' 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
--[[----------------------< _ M A I N >-----------------------------------------
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 {{#invoke:template wrapper| .. .| .. .}}
if template == nil 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 = frame.args['_include-positional'] == 'yes' -- 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 type(k) == 'string' 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=[[wikisource:{{{chapter}}}|{{{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
--[[----------------------< W R A P >-------------------------------------------
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
--[[----------------------< L I S T >-------------------------------------------
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_28#Module:PassArguments
This function replaces a similarly named function which was used in {{cite compare}} and {{cite compare2}}
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|%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({
'<code style="color:inherit; background:inherit; border:none;">{{',
template,
('<wbr><nowiki>|%s</nowiki>'):rep(#args):format(unpack(args)), '}}</code>'})) -- render the template
end
local function link(frame)
return list(frame, true)
end
--[[----------------------< E X P O R T E D F U N C T I O N S >---------------
]]
return {
link = link,
list = list,
wrap = wrap,
}