Module:Parameter validation
This module is based on idea and original code of User:IKhitron.
the source of this module is in //he.wikipedia.org/wiki/Module:ParamValidator
This module exports two functions: calculateViolations( frame, subpages ), and validateParams( frame ).
calculateViolations( frame, subpages ) finds templatedata, in template page or in one of its subpages in the list, if provided. it returns a table with the violations. if there are none, the table is empty. otherwise it has the structure
{
violation1 = { param1 = value1, param2 = value2 },
violation2 = { ... },
...
}
violation1, violation2 etc. are one of the names of specific violations, as described below. param1, param2 etc. are either the names of parameter passed to the template, or defined in templatedata. value1, value2 etc. are the values passed to the template, or an empty string if no such parameter was passed.
the different violations are as follow:
- no-templatedata
no valid tempaltedata was found in tempalte page, or documentation subpage - undeclared
named parameters with non-empty value, does not exist in templatedata - empty-undeclared
named parameters with empty value, does not exist in templatedata - undeclared-numeric
numeric parameters with non-empty value, does not exist in templatedata - empty-undeclared-numeric
numeric parameters with empty value, does not exist in templatedata - deprecated
parameters with non-empty value, marked as "deprecated" in tempaltedata - empty-deprecated
parameters with empty value, marked as "deprecated" in tempaltedata - empty-required
missing or empty parameter marked as "required" in tempaltedata - incompatible
a non-empty parameter passed to the template, incompatible with the parameter type defined in templatedata
The second function, validateParams( frame ), can be called from the tempalte' using #invoke.
it expects a parameter named "options", which contains the definition of the output. typically, it's used by placing something like so:
<includeonly>{{#invoke:Parameter validation| validateParams | options = {{PV default options}} }}</includeonly>
at the top of the template (be mindful not to add extra spaces and newlines to the template).
the options parameter should be a JSON-encoded string, defining the output, and some special behaviors.
the example above assumes that a wiki page named Template:PV default options exists, and contains valid JSON string.
for each of the violations defined above, "options" may define an output string, so basically, "options" looks like so:
{
violation1: outputstring1,
violation2: outputstring2,
.... ,
behavior1: some value,
....
}
not all violations have to be defined. a violation not defined in "options" will be ignored.
when invoked, it extract "subpages" from the options parameter, and calls:
- calculateViolations( frame, subpages )
if the returned table is empty, no violation were found, and an empty string is returned and nothing else happens.
otherwise, for each of the violations, i.e., the keys of the returned table, when "options" contains this key, the corresonding value is appended to the output.
some further processing is done:
- several tokens are replaced with calculated values. these are described below.
- some "meta" violations are calculated: when any none-ignored violation occured, the "any" meta-violation is added to the output in the same way, i.e. the string keyed by "any" in the options is appended to output with appropriate substitutions. similarly, "multiple" meta-violation is created when more than one type of non-ignored violations occured.
- if the output is not empty, a prefix and suffix strings are prepended and appended to it.
these are the tokens and the replacement.
- templatename
full template name, including namespace. - tname_naked
template name without namespace. - paramname
comma-separated list of parameters - paramandvalue
is replaced by comma-separated list of "name: value" pairs of parameters and values
the first two are applied to the whole output, including the suffux and prefix, and the rest are applied to the individual violations, each with its own list of offending parameters and values.
the rest of the if the value of some keys is null, this error condition will be ignored, and not counted when calculating "any" and "multiple" conditions.
some other optional fields can be passed via options:
- doc-subpage
can be either a string, or a list (in square bracktes) of strings, indicating subpages of the template that may contain templatedata. - ignore
list of patterns. any parameter whose name matches any pattern, will not considered in violation of any of the rules. - skip-empty-numeric
if a quoted number, the module will ignore non-declared empty numeric parameters up to this number - wrapper-prefix
openning wrapper element of outpot (defaults to<div class = 'paramvalidator-wrapper'>) - wrapper-suffix
closing wrapper element of output (defaults to "</div>")
additional option parameters, named options1, options2, etc. can be passed. any entry defined in these options will override the previous value. a typical use may be like so:
typically, this JSON structure will be placed in a separate template, and retrieved for the module-use as shown above.
<includeonly>{{#invoke:Parameter validation | validateParams | options = {{PV default options}} | options1 = {"key":"value"} }}</includeonly>
"key" can override any of the options fields described above.
local util = {
empty = function( s )
return s == nil or type( s ) == 'string' and mw.text.trim( s ) == ''
end
,
extract_options = function ( frame, optionsPrefix )
optionsPrefix = optionsPrefix or 'options'
local options, n, more = {}
if frame.args['module_options'] then
local module_options = mw.loadData( frame.args['module_options'] )
if type( module_options ) ~= 'table' then return {} end
local title = mw.title.getCurrentTitle()
local local_ptions = module_options[ title.namespace ] or module_options[ title.nsText ] or {}
for k, v in pairs( local_ptions ) do options[k] = v end
end
repeat
ok, more = pcall( mw.text.jsonDecode, frame.args[optionsPrefix .. ( n or '' )] )
if ok and type( more ) == 'table' then
for k, v in pairs( more ) do options[k] = v end
end
n = ( n or 0 ) + 1
until not ok
return options
end
,
build_namelist = function ( template_name, sp )
local res = { template_name }
if sp then
if type( sp ) == 'string' then sp = { sp } end
for _, p in ipairs( sp ) do table.insert( res, template_name .. '/' .. p ) end
end
return res
end
,
table_empty = function( t ) -- normally, test if next(t) is nil, but for some perverse reason, non-empty tables returned by loadData return nil...
if type( t ) ~= 'table' then return true end
for a, b in pairs( t ) do return false end
return true
end
,
}
local function _readTemplateData( templateName )
local title = mw.title.makeTitle( 0, templateName )
local templateContent = title and title.exists and title:getContent() -- template's raw content
local capture = templateContent and mw.ustring.match( templateContent, '<templatedata%s*>(.*)</templatedata%s*>' ) -- templatedata as text
-- capture = capture and mw.ustring.gsub( capture, '"(%d+)"', tonumber ) -- convert "1": {} to 1: {}. frame.args uses numerical indexes for order-based params.
local trailingComma = capture and mw.ustring.find( capture, ',%s*[%]%}]' ) -- look for ,] or ,} : jsonDecode allows it, but it's verbotten in json
if capture and not trailingComma then return pcall( mw.text.jsonDecode, capture ) end
return false
end
local function readTemplateData( templateName )
if type( templateName ) == 'string' then
templateName = { templateName, templateName .. '/' .. docSubPage }
end
if type( templateName ) == "table" then
for _, name in ipairs( templateName ) do
local td, result = _readTemplateData( name )
if td then return result end
end
end
return nil
end
-- this is the function to be called by other modules. it expects the frame, and then an optional list of subpages, e.g. { "Documentation" }.
-- if second parameter is nil, only tempalte page will be searched for templatedata.
function calculateViolations( frame, subpages )
-- used for parameter type validy test. keyed by TD 'type' string. values are function(val) returning bool.
local type_validators = {
['number'] = function( s ) return mw.language.getContentLanguage():parseFormattedNumber( s ) end
}
function compatible( typ, val )
local func = type_validators[typ]
return type( func ) ~= 'function' or util.empty( val ) or func( val )
end
local t_frame = frame:getParent()
local t_args, template_name = t_frame.args, t_frame:getTitle()
template_name = mw.ustring.gsub( template_name, '/sandbox', '', 1 )
local td_source = util.build_namelist( template_name, subpages )
if frame.args['td_source'] then
table.insert(td_source, frame.args['td_source'])
end
local templatedata = readTemplateData( td_source )
local td_params = templatedata and templatedata.params
local all_aliases, all_series = {}, {}
if not td_params then return { ['no-templatedata'] = { [''] = '' } } end
-- from this point on, we know templatedata is valid.
local res = {} -- before returning to caller, we'll prune empty tables
-- allow for aliases
for x, p in pairs( td_params ) do for y, alias in ipairs( p.aliases or {} ) do
p['primary'] = x
td_params[x] = p
all_aliases[alias] = p
if tonumber(alias) then all_aliases[tonumber(alias)] = p end
end end
-- handle undeclared and deprecated
local already_seen = {}
local series = frame.args['series']
for p_name, value in pairs( t_args ) do
local tp_param, noval, numeric, table_name = td_params[p_name] or all_aliases[p_name], util.empty( value ), tonumber( p_name )
local hasval = not noval
if not tp_param and series then -- 2nd chance. check to see if series
for s_name, p in pairs(td_params) do
if mw.ustring.match( p_name, '^' .. s_name .. '%d+' .. '$') then
-- mw.log('found p_name '.. p_name .. ' s_name:' .. s_name, ' p is:', p) debugging series support
tp_param = p
end -- don't bother breaking. td always correct.
end
end
if not tp_param then -- not in TD: this is called undeclared
-- calculate the relevant table for this undeclared parameter, based on parameter and value types
table_name =
noval and numeric and 'empty-undeclared-numeric' or
noval and not numeric and 'empty-undeclared' or
hasval and numeric and 'undeclared-numeric' or
'undeclared' -- tzvototi nishar.
else -- in td: test for deprecation and mistype. if deprecated, no further tests
table_name = tp_param.deprecated and hasval and 'deprecated'
or tp_param.deprecated and noval and 'empty-deprecated'
or not compatible( tp_param.type, value ) and 'incompatible'
or not series and already_seen[tp_param] and hasval and 'duplicate'
if hasval and table_name ~= 'duplicate' then
already_seen[tp_param] = p_name
end
end
-- report it.
if table_name then
res[table_name] = res[table_name] or {}
if table_name == 'duplicate' then
local primary_param = tp_param['primary']
local primaryData = res[table_name][primary_param]
if not primaryData then
primaryData = {}
table.insert(primaryData, already_seen[tp_param])
end
table.insert(primaryData, p_name)
res[table_name][primary_param] = primaryData
else
res[table_name][p_name] = value
end
end
end
-- check for empty/missing parameters declared "required"
for p_name, param in pairs( td_params ) do
if param.required and util.empty( t_args[p_name] ) then
local is_alias
for _, alias in ipairs( param.aliases or {} ) do is_alias = is_alias or not util.empty( t_args[alias] ) end
if not is_alias then
res['empty-required'] = res['empty-required'] or {}
res['empty-required'][p_name] = ''
end
end
end
mw.logObject(res)
return res
end
-- wraps report in hidden frame
function wrapReport(report, template_name, options)
mw.logObject(report)
if util.empty( report ) then return '' end
local naked = mw.title.new( template_name )['text']
naked = mw.ustring.gsub(naked, 'Infobox', 'infobox', 1)
report = ( options['wrapper-prefix'] or "<div class = 'paramvalidator-wrapper'><span class='paramvalidator-error'>" )
.. report
.. ( options['wrapper-suffix'] or "</span></div>" )
report = mw.ustring.gsub( report, 'tname_naked', naked )
report = mw.ustring.gsub( report, 'templatename', template_name )
return report
end
-- this is the "user" version, called with {{#invoke:}} returns a string, as defined by the options parameter
function validateParams( frame )
local options, report, template_name = util.extract_options( frame ), '', frame:getParent():getTitle()
local ignore = function( p_name )
for _, pattern in ipairs( options['ignore'] or {} ) do
if mw.ustring.match( p_name, '^' .. pattern .. '$' ) then return true end
end
return false
end
local replace_macros = function( error_type, s, param_names )
function concat_and_escape( t , sep )
sep = sep or ', '
local s = table.concat( t, sep )
return ( mw.ustring.gsub( s, '%%', '%%%%' ) )
end
if s and ( type( param_names ) == 'table' ) then
local k_ar, kv_ar = {}, {}
for k, v in pairs( param_names ) do
table.insert( k_ar, k )
if type(v) == 'table' then
v = table.concat(v, ', ')
end
if error_type == 'duplicate' then
table.insert( kv_ar, v)
else
table.insert( kv_ar, k .. ': ' .. v)
end
end
s = mw.ustring.gsub( s, 'paramname', concat_and_escape( k_ar ) )
s = mw.ustring.gsub( s, 'paramandvalue', concat_and_escape( kv_ar, ' AND ' ) )
if mw.getCurrentFrame():preprocess( "{{REVISIONID}}" ) ~= "" then
s = mw.ustring.gsub( s, "<div.*<%/div>", "", 1 )
end
end
return s
end
local report_params = function( key, param_names )
local res = replace_macros( key, options[key], param_names )
res = frame:preprocess(res or '')
report = report .. ( res or '' )
return res
end
-- no option no work.
if util.table_empty( options ) then return '' end
-- get the errors.
local violations = calculateViolations( frame, options['doc-subpage'] )
-- special request of bora: use skip_empty_numeric
if violations['empty-undeclared-numeric'] then
for i = 1, tonumber( options['skip-empty-numeric'] ) or 0 do
violations['empty-undeclared-numeric'][i] = nil
end
end
-- handle ignore list, and prune empty violations - in that order!
local offenders = 0
for name, tab in pairs( violations ) do
-- remove ignored parameters from all violations
for pname in pairs( tab ) do if ignore( pname ) then tab[pname] = nil end end
-- prune empty violations
if util.table_empty( tab ) then violations[name] = nil end
-- WORK IS DONE. report the errors.
-- if report then count it.
if violations[name] and report_params( name, tab ) then offenders = offenders + 1 end
end
if offenders > 1 then report_params( 'multiple' ) end
if offenders ~= 0 then report_params( 'any' ) end -- could have tested for empty( report ), but since we count them anyway...
return wrapReport(report, template_name, options)
end
return {
['validateparams'] = validateParams,
['calculateViolations'] = calculateViolations,
['wrapReport'] = wrapReport
}