Module:If not given or empty
This module's check_parameter function checks whether a parameter is given, empty, or nonempty in a template call. It is intended to be called from template definitions only, as
{{#invoke:If not given or empty|check_parameter|parameter name|before|after|when=NG EM NE|notgiven=|empty=|notempty=}}
This is similar to {{If then show|{{{parameter name|}}}|...|before|after}}, but also checks if the parameter is *present* in the template call. This can be useful in the calls from a template to some existing templates, where the output depends on the three states of a parameter, as it does in {{Location map}} for {{{caption}}}.
The values before and after are added only for cases in which |when= contains the codes NG (for not given), EM (given but empty), NE (given and not empty).
Examples
Template {{Infobox some thing}} has parameter {{{image}}}. When used on a page, the template can be called without the parameter, as in {{Infobox some thing|}}, or with the parameter, in which case the parameter can have no value ({{Infobox some thing|image=}}) or some value ({{Infobox some thing|image=some value}}). This module has different outputs depending on these three cases.
{{#invoke:If not given or empty|check_parameter|image|before | after|when=EM|notgiven=[[Image:Red pog.svg|30px]]|empty=EMPTY|notempty=[[File:{{{image}}}|30px]]}}
{{Infobox some thing|}}- final output is the equivalent of
[[Image:Red pog.svg|30px]]. Textbeforeandafteris not added becausewhendoes not contain NG (for not given).
{{Infobox some thing|image=}}- final output is
before EMPTY after. Textbeforeandafteris added becausewhencontains EM (for empty).
{{Infobox some thing|image=Green pog.svg}}- final output is the equivalent of
[[File:Green pog.svg|30px]]. Textbeforeandafteris not added becausewhendoes not contain NE (for not empty).
-- This module's check_parameter function checks whether a parameter is given, empty, or nonempty in a template call.
-- It is intended to be called from templates only, as {{#invoke:If not given or empty|check_parameter|parameter name|before|after|when=NG EM NE|notgiven=|empty=|notempty=}}
-- This is similar to {{If then show|{{{parameter name|}}}|...|before|after}}, but also checks if the parameter is *present* in the template call.
-- before and after are added only for cases in which when= contains the codes NG (for not given), EM (given but empty), NE (given and not empty)
local p = {}
function p.check_parameter(frame)
local m_args = frame.args
local t_args = frame:getParent().args
local check_param = m_args[1] and mw.text.trim(m_args[1]) or ''
if (check_param ~= '') then
local s, c
if not t_args[check_param] then
s = m_args.notgiven or ''
c = 'NG'
elseif t_args[check_param] == '' then
s = m_args.empty or ''
c = 'EM'
else
s = m_args.notempty or ''
c = 'NE'
end
local before = ''
local after = ''
local when = m_args.when or ''
if when:find(c) then
before = m_args[2]
after = m_args[3]
end
return before .. s .. after
end
error("Function called without template's parameter name")
end
return p
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