မေႃႇၵျူး:parameters
This module provides processing and checking of template arguments.
process
မႄးထတ်းprocess(args, params, return_unknown)
Processes arguments with a given list of parameters, and returns a table containing the processed arguments. The args parameter specifies the arguments to be processed; they are the arguments you might retrieve from frame:getParent().args. The params parameter specifies a list of valid parameters, and consists of a table. If an argument is encountered that is not in the parameter table, an error is shown.
The parameters table should have the parameter names as the indexes, and a (possibly empty) table of parameter tags as the value. An empty table as the value merely states that the parameter exists, but should not receive any special treatment. Possible parameter tags are listed below.
An example parameters table (from Module:translations):
{
[1] = {required = true, default = "und"},
[2] = {},
[3] = {list = true},
["alt"] = {},
["sc"] = {},
["tr"] = {},
}
The return_unknown parameter, if set to true, prevents the function from triggering an error when it comes across an argument with a name that it doesn't recognise. Instead, the return value is a pair of values: the first is the processed arguments as usual, while the second contains all the unrecognised arguments that were left unprocessed. This allows you to do multi-stage processing, where the entire set of arguments that a template should accept is not known at once. For example, an inflection-table might do some generic processing on some arguments, but then defer processing of the remainder to the function that handles a specific inflectional type.
Parameter tags
မႄးထတ်းrequired = true- The parameter is required; an error is shown if it is not present. The template's page itself is an exception; no error is shown there.
default =- Specifies a default value for the parameter, if it is absent or empty. When used on list parameters, this specifies a default value for the first item in the list only. Note that it is not possible to generate a default that depends on the value of other parameters.
- If used together with
required = true, the default applies only to the template's page itself. This can be used to show an example text. alias_of =- Treat the parameter as an alias of another. When arguments are specified for this parameter, they will automatically be renamed and stored under the alias name. This allows for parameters with multiple alternative names, while still treating them as if they had only one name. It is even possible for the
alias_of =to have a name that is not a parameter itself. - Aliases should not be required, as this prevents the other name or names of the parameter from being used. Parameters that are aliases and required at the same time are tracked (see Special:WhatLinksHere/Template:tracking/parameters/required alias).
allow_empty = true- If the argument is an empty string value, it is not converted to
nil, but kept as-is. allow_whitespace = true- Spacing characters such as spaces and newlines at the beginning and end of a positional parameter are not removed.
type =- Specifies what value type to convert the argument into. The default is to leave it as a text string. Alternatives are:
type = "boolean"- The value is treated as a boolean value, either true or false. No value, the empty string, and the strings
"0","no","n"and"false"are treated asfalse, all other values are consideredtrue. type = "number"- The value is converted into a number, or
nilif the value is not parsable as a number.
list =- Treat the parameter as a list of values, each having its own parameter name, rather than a single value. The parameters will have a number at the end, except optionally for the first (but see also
require_index = true). For example,list = trueon a parameter named "head" will include the parameters|head=(or|head1=),|head2=,|head3=and so on. If the parameter name is a number, another number doesn't get appended, but the counting simply continues, e.g. for parameter3the sequence is|3=,|4=,|5=etc. List parameters are returned as numbered lists, so for a template that is given the parameters|head=a|head2=b|head3=c, the processed value of the parameter"head"will be{ "a", "b", "c" }. - The value for
list =can also be a string. This tells the module that parameters other than the first should have a different name, which is useful when the first parameter in a list is a number, but the remainder is named. An example would be for genders:list = "g"on a parameter named1would have parameters|1=,|g2=,|g3=etc. - If the number is not located at the end, it can be specified by putting an equal sign "=" at the number position. For example, parameters
|f1accel=,|f2accel=, ... can be captured by using the parameter name"f=accel", as is done in Module:headword/templates. allow_holes = true- This is used in conjunction with list-type parameters. By default, the values are tightly packed in the resulting list. This means that if, for example, an entry specified
head=a|head3=cbut not|head2=, the returned list will be{"a", "c"}, with the values stored at the indices1and2, not1and3. If it is desirable to keep the numbering intact, for example if the numbers of several list parameters correlate with each other (like those of{{compound}}), then this tag should be specified. - If
allow_holes = trueis given, there may benilvalues in between two real values, which makes many of Lua's table processing functions no longer work, like#oripairs(). To remedy this, the resulting table will contain an additional named value,maxindex, which tells you the highest numeric index that is present in the table. In the example above, the resulting table will now be{ "a", nil, "c", maxindex = 3}. That way, you can iterate over the values from1tomaxindex, while skippingnilvalues in between. require_index = true- This is used in conjunction with list-type parameters. By default, the first parameter can have its index omitted. For example, a list parameter named
headcan have its first parameter specified as either|head=or|head1=. Ifrequire_index = trueis specified, however, only|head1=is recognized, and|head=will be treated as an unknown parameter.{{affixusex}}(and variants{{suffixusex}},{{prefixusex}}) use this, for example, on all list parameters. One possible use opened up by this is to distinguish between|head=and|head1=as different parameters. This is used in{{affixusex}}and variants, for example, to distinguish between|sc=(a script code for all elements in the usex's language) and|sc1=(the script code of the first element, used when|lang1=is also specified to indicate that the first element is in a different language). no_lang_code = true- This may only be used with parameter
[1], and ensures that an error is thrown if the input matches a language code. This is useful for templates that do not take language codes, meaning that any match is very likely due to user error. If this tag is used, then the parameternotlangcodemust also be specified for the given template, which is used to override the error.
local export = {}
local debug_track_module = "Module:debug/track"
local families_module = "Module:families"
local function_module = "Module:fun"
local labels_module = "Module:labels"
local languages_module = "Module:languages"
local pages_module = "Module:pages"
local parse_utilities_module = "Module:parse utilities"
local references_module = "Module:references"
local scripts_module = "Module:scripts"
local string_utilities_module = "Module:string utilities"
local table_module = "Module:table"
local wikimedia_languages_module = "Module:wikimedia languages"
local require = require
local require_when_needed = require("Module:require when needed")
local m_str_utils = require(string_utilities_module)
local dump = mw.dumpObject
local find = string.find
local floor = math.floor
local gsplit = m_str_utils.gsplit
local gsub = string.gsub
local huge = math.huge
local insert = table.insert
local ipairs = ipairs
local is_callable = require(function_module).is_callable
local is_valid_title = require_when_needed(pages_module, "is_valid_title")
local list_to_set = require_when_needed(table_module, "listToSet")
local list_to_text = mw.text.listToText
local make_title = mw.title.makeTitle
local match = string.match
local max = math.max
local new_title = mw.title.new
local pairs = pairs
local pattern_escape = m_str_utils.pattern_escape
local rawset = rawset
local remove_holes = require_when_needed("Module:parameters/remove holes")
local rsplit = m_str_utils.split
local scribunto_param_key = m_str_utils.scribunto_param_key
local sort = table.sort
local split_on_comma = require_when_needed(parse_utilities_module, "split_on_comma")
local tonumber = tonumber
local tostring = tostring
local trim = m_str_utils.trim
local type = type
local yesno = require_when_needed("Module:yesno")
local current_title -- Current title.
local current_namespace -- Current namespace.
local frame_title -- Title of the originating module.
local parent_frame_title -- Title of the page containing {{#invoke:}} (if any).
local is_invoke_page -- Whether the current title is either of those titles.
do
local page_title_obj = mw.title.getCurrentTitle()
current_title = page_title_obj.prefixedText
current_namespace = page_title_obj.namespace
local frame = mw.getCurrentFrame()
frame_title = frame:getTitle()
local parent_frame = frame:getParent()
if parent_frame then
parent_frame_title = parent_frame:getTitle()
end
is_invoke_page = current_title == frame_title or current_title == parent_frame_title
end
--[==[ intro:
This module is used to standardize template argument processing and checking. A typical workflow is as follows (based
on [[Module:translations]]):
{
...
local parent_args = frame:getParent().args
local params = {
[1] = {required = true, type = "language", default = "und"},
[2] = true,
[3] = {list = true},
["alt"] = true,
["id"] = true,
["sc"] = {type = "script"},
["tr"] = true,
["ts"] = true,
["lit"] = true,
}
local args = require("Module:parameters").process(parent_args, params)
-- Do further processing of the parsed arguments in `args`.
...
}
The `params` table should have the parameter names as the keys, and a (possibly empty) table of parameter tags as the
value. An empty table as the value merely states that the parameter exists, but should not receive any special
treatment; if desired, empty tables can be replaced with the value `true` as a perforamnce optimization.
Possible parameter tags are listed below:
; {required = true}
: The parameter is required; an error is shown if it is not present. The template's page itself is an exception; no
error is shown there.
; {default =}
: Specifies a default input value for the parameter, if it is absent or empty. This will be processed as though it were
the input instead, so (for example) {default = "und"} with the type {"language"} will return a language object for
[[:Category:Undetermined language|Undetermined language]] if no language code is provided. When used on list
parameters, this specifies a default value for the first item in the list only. Note that it is not possible to
generate a default that depends on the value of other parameters. If used together with {required = true}, the default
applies only to template pages (see the following entry), as a side effect of the fact that "required" parameters
aren't actually required on template pages. This can be used to show an example of the template in action when the
template page is visited; however, it is preferred to use `template_default` for this purpose, for clarity.
; {template_default =}
: Specifies a default input value for absent or empty parameters only on template pages. Template pages are any page in
the template space (beginning with `Template:`) except for documentation pages (those ending in `.../documentation`).
This can be used to provide an example value for a non-required parameter when the template page is visited, without
interfering with other uses of the template. Both `template_default` and `default` can be specified for the same
parameter. If this is done, `template_default` applies on template pages, and `default` on other pages. As an example,
{{tl|cs-IPA}} uses the equivalent of {[1] = {default = "+", template_default = "příklad"}} to supply a default of
{"+"} for mainspace and documentation pages (which tells the module to use the value of the {{para|pagename}}
parameter, falling back to the actual pagename), but {"příklad"} (which means "example"), on [[Template:cs-IPA]].
; {alias_of =}
: Treat the parameter as an alias of another. When arguments are specified for this parameter, they will automatically
be renamed and stored under the alias name. This allows for parameters with multiple alternative names, while still
treating them as if they had only one name. The conversion-related properties of an aliased parameter (e.g. `type`,
`set`, `convert`, `sublist`) are taken from the aliasee, and the corrresponding properties set on the alias itself
are ignored; but other properties on the alias are taken from the alias's spec and not from the aliasee's spec. This
means, for example, that if you create an alias of a list parameter, the alias must also specify the `list` property
or it is not a list. (In such a case, a value specified for the alias goes into the first item of the aliasee's list.
You cannot make a list alias of a non-list parameter; this causes an error to be thrown.) Similarly, if you specify
`separate_no_index` on an aliasee but not on the alias, uses of the unindexed aliasee parameter are stored into the
`.default` key, but uses of the unindexed alias are stored into the first numbered key of the aliasee's list.
Aliases cannot be required, as this prevents the other name or names of the parameter from being used. Parameters
that are aliases and required at the same time cause an error to be thrown.
; {allow_empty = true}
: If the argument is an empty string value, it is not converted to {nil}, but kept as-is. The use of `allow_empty` is
disallowed if a type has been specified, and causes an error to be thrown.
; {no_trim = true}
: Spacing characters such as spaces and newlines at the beginning and end of a positional parameter are not removed.
(MediaWiki itself automatically trims spaces and newlines at the edge of named parameters.) The use of `no_trim` is
disallowed if a type has been specified, and causes an error to be thrown.
; {type =}
: Specifies what value type to convert the argument into. The default is to leave it as a text string. Alternatives are:
:; {type = "boolean"}
:: The value is treated as a boolean value, either true or false. No value, the empty string, and the strings {"0"},
{"no"}, {"n"} and {"false"} are treated as {false}, all other values are considered {true}.
:; {type = "number"}
:: The value is converted into a number, and throws an error if the value is not parsable as a number. Input values may
be signed (`+` or `-`), and may contain decimal points and leading zeroes. If {allow_hex = true}, then hexadecimal
values in the form {"0x100"} may optionally be used instead, which otherwise have the same syntax restrictions
(including signs, decimal digits, and leading zeroes after {"0x"}). Hexadecimal inputs are not case-sensitive. Lua's
special number values (`inf` and `nan`) are not possible inputs.
:; {type = "language"}
:: The value is interpreted as a full or [[Wiktionary:Languages#Etymology-only languages|etymology-only language]] code
language code (or name, if {method = "name"}) and converted into the corresponding object (see [[Module:languages]]).
If the code or name is invalid, then an error is thrown. The additional setting {family = true} can be given to allow
[[Wiktionary:Language families|language family codes]] to be considered valid and the corresponding object returned.
Note that to distinguish an etymology-only language object from a full language object, use
{object:hasType("language", "etymology-only")}.
:; {type = "full language"}
:: The value is interpreted as a full language code (or name, if {method = "name"}) and converted into the corresponding
object (see [[Module:languages]]). If the code or name is invalid, then an error is thrown. Etymology-only languages
are not allowed. The additional setting {family = true} can be given to allow
[[Wiktionary:Language families|language family codes]] to be considered valid and the corresponding object returned.
:; {type = "wikimedia language"}
:: The value is interpreted as a code and converted into a wikimedia language object. If the code is invalid, then an
error is thrown. If {method = "fallback"} is specified, conventional language codes which are different from their
Wikimedia equivalent will also be accepted as a fallback.
:; {type = "family"}
:: The value is interpreted as a language family code (or name, if {method = "name"}) and converted into the
corresponding object (see [[Module:families]]). If the code or name is invalid, then an error is thrown.
:; {type = "script"}
:: The value is interpreted as a script code (or name, if {method = "name"}) and converted into the corresponding object
(see [[Module:scripts]]). If the code or name is invalid, then an error is thrown.
:; {type = "title"}
:: The value is interpreted as a page title and converted into the corresponding object (see the [[mw:Extension:Scribunto/Lua_reference_manual#Title_library|Title library]]). If the page title is invalid, then an error is thrown. If {namespace = n} (where {n} is a namespace number), then the title object will be in that namespace unless overridden by a namespace prefix in the value; this is the way that template invocations work, where the template namespace is used by default, but can be overridden. If {strict = true}, then the namespace prefix is unconditionally added to the value in all cases, even if a prefix is already present; this is way that {{tl|#invoke:}} works, where the "Module:" prefix is always appended no matter what.
:; {type = "qualifier"}
:: The value is interpreted as a qualifier and converted into the correct format for passing into `format_qualifiers()`
in [[Module:qualifier]] (which currently just means converting it to a one-item list).
:; {type = "labels"}
:: The value is interpreted as a comma-separated list of labels and converted into the correct format for passing into
`show_labels()` in [[Module:labels]] (which is currently a list of strings). Splitting is done on commas not followed
by whitespace, except that commas inside of double angle brackets do not count even if not followed by whitespace.
This type should be used by for normal labels (typically specified using {{para|l}} or {{para|ll}}) and accent
qualifiers (typically specified using {{para|a}} and {{para|aa}}).
:; {type = "references"}
:: The value is interpreted as one or more references, in the format prescribed by `parse_references()` in
[[Module:references]], and converted into a list of objects of the form accepted by `format_references()` in the same
module. If a syntax error is found in the reference format, an error is thrown.
:; {type = function(val) ... end}
:: `type` may be set to a function (or callable table), which must take the argument value as its sole argument, and must
output one of the other recognized types. This is particularly useful for lists (see below), where certain values need
to be interpreted differently to others.
; {list =}
: Treat the parameter as a list of values, each having its own parameter name, rather than a single value. The
parameters will have a number at the end, except optionally for the first (but see also {require_index = true}). For
example, {list = true} on a parameter named "head" will include the parameters {{para|head}} (or {{para|head1}}),
{{para|head2}}, {{para|head3}} and so on. If the parameter name is a number, another number doesn't get appended, but
the counting simply continues, e.g. for parameter {3} the sequence is {{para|3}}, {{para|4}}, {{para|5}} etc. List
parameters are returned as numbered lists, so for a template that is given the parameters `|head=a|head2=b|head3=c`,
the processed value of the parameter {"head"} will be { { "a", "b", "c" }}}.
: The value for {list =} can also be a string. This tells the module that parameters other than the first should have a
different name, which is useful when the first parameter in a list is a number, but the remainder is named. An example
would be for genders: {list = "g"} on a parameter named {1} would have parameters {{para|1}}, {{para|g2}}, {{para|g3}}
etc.
: If the number is not located at the end, it can be specified by putting {"\1"} at the number position. For example,
parameters {{para|f1accel}}, {{para|f2accel}}, ... can be captured by using the parameter name {"f\1accel"}, as is
done in [[Module:headword/templates]].
; {set =}
: Require that the value of the parameter be one of the specified list of values (or omitted, if {required = true} isn't
given). The values in the specified list should be strings corresponding to the raw parameter values except when
{type = "number"}, in which case they should be numbers. The use of `set` is disallowed if {type = "boolean"} and
causes an error to be thrown.
; {sublist =}
: The value of the parameter is a delimiter-separated list of individual raw values. The resulting field in `args` will
be a Lua list (i.e. a table with numeric indices) of the converted values. If {sublist = true} is given, the values
will be split on commas (possibly with whitespace on one or both sides of the comma, which is ignored). If
{sublist = "comma without whitespace"} is given, the values will be split on commas which are not followed by whitespace,
and which aren't preceded by an escaping backslash. Otherwise, the value of `sublist` should be either a Lua pattern
specifying the delimiter(s) to split on or a function (or callable table) to do the splitting, which is passed two values
(the value to split and a function to signal an error) and should return a list of the split values.
; {convert =}
: If given, this specifies a function (or callable table) to convert the raw parameter value into the Lua object used
during further processing. The function is passed two arguments, the raw parameter value itself and a function used to
signal an error during parsing or conversion, and should return one value, the converted parameter. The error-signaling
function contains the name and raw value of the parameter embedded into the message it generates, so these do not need to
specified in the message passed into it. If `type` is specified in conjunction with `convert`, the processing by
`type` happens first. If `sublist` is given in conjunction with `convert`, the raw parameter value will be split
appropriately and `convert` called on each resulting item.
; {allow_hex = true}
: When used in conjunction with {type = "number"}, allows hexadecimal numbers as inputs, in the format {"0x100"} (which is
not case-sensitive).
; {family = true}
: When used in conjunction with {type = "language"}, allows [[Wiktionary:Language families|language family codes]] to be
returned. To check if a given object refers to a language family, use {object:hasType("family")}.
; {method = "name"}
: When used in conjunction with {type = "language"}, {type = "family"} or {type = "script"}, checks for and parses a
language, family or script name instead of a code.
; {allow_holes = true}
: This is used in conjunction with list-type parameters. By default, the values are tightly packed in the resulting
list. This means that if, for example, an entry specified `head=a|head3=c` but not {{para|head2}}, the returned list
will be { {"a", "c"}}}, with the values stored at the indices {1} and {2}, not {1} and {3}. If it is desirable to keep
the numbering intact, for example if the numbers of several list parameters correlate with each other (like those of
{{tl|affix}}), then this tag should be specified.
: If {allow_holes = true} is given, there may be {nil} values in between two real values, which makes many of Lua's
table processing functions no longer work, like {#} or {ipairs()}. To remedy this, the resulting table will contain an
additional named value, `maxindex`, which tells you the highest numeric index that is present in the table. In the
example above, the resulting table will now be { { "a", nil, "c", maxindex = 3}}}. That way, you can iterate over the
values from {1} to `maxindex`, while skipping {nil} values in between.
; {disallow_holes = true}
: This is used in conjunction with list-type parameters. As mentioned above, normally if there is a hole in the source
arguments, e.g. `head=a|head3=c` but not {{para|head2}}, it will be removed in the returned list. If
{disallow_holes = true} is specified, however, an error is thrown in such a case. This should be used whenever there
are multiple list-type parameters that need to line up (e.g. both {{para|head}} and {{para|tr}} are available and
{{para|head3}} lines up with {{para|tr3}}), unless {allow_holes = true} is given and you are prepared to handle the
holes in the returned lists.
; {require_index = true}
: This is used in conjunction with list-type parameters. By default, the first parameter can have its index omitted.
For example, a list parameter named `head` can have its first parameter specified as either {{para|head}} or
{{para|head1}}. If {require_index = true} is specified, however, only {{para|head1}} is recognized, and {{para|head}}
will be treated as an unknown parameter. {{tl|affixusex}} (and variants {{tl|suffixusex}}, {{tl|prefixusex}}) use
this, for example, on all list parameters.
; {separate_no_index = true}
: This is used to distinguish between {{para|head}} and {{para|head1}} as different parameters. For example, in
{{tl|affixusex}}, to distinguish between {{para|sc}} (a script code for all elements in the usex's language) and
{{para|sc1}} (the script code of the first element, used when the first element is prefixed with a language code to
indicate that it is in a different language). When this is used, the resulting table will contain an additional named
value, `default`, which contains the value for the indexless argument.
; {demo = true}
: This is used as a way to ensure that the parameter is only enabled on the template's own page (and its documentation page), and in the User: namespace; otherwise, it will be treated as an unknown parameter. This should only be used if special settings are required to showcase a template in its documentation (e.g. adjusting the pagename or disabling categorization). In most cases, it should be possible to do this without using demo parameters, but they may be required if a template/documentation page also contains real uses of the same template as well (e.g. {{tl|shortcut}}), as a way to distinguish them.
]==]
local function track(page)
local tracking_page = "parameters/" .. page
local pages, current, mod, func = {tracking_page}
-- Check through the traceback to get the calling module and function.
for mod, func in debug.traceback():gmatch("%f[^%z\n]\tModule:(.-):%d+: in function '(.-)'%f[%z\n]") do
if current == nil then
current = mod -- Name of this module.
elseif mod ~= current then
insert(pages, tracking_page .. "/" .. mod)
-- FIXME: if the calling function is the one called by #invoke:, traceback calls it "chunk" instead of its actual name.
insert(pages, tracking_page .. "/" .. mod .. "/" .. func)
break
end
end
require(debug_track_module)(pages)
end
-------------------------------------- Some splitting functions -----------------------------
-- Split an argument on comma, but not comma followed by whitespace.
local function split_on_comma_without_whitespace(val)
if find(val, "\\", 1, true) or match(val, ",%s") then
return split_on_comma(val)
else
return rsplit(val, ",")
end
end
-------------------------------------- Error handling -----------------------------
local function process_error(fmt, ...)
local args = {...}
for i, val in ipairs(args) do
args[i] = dump(val)
end
if type(fmt) == "table" then
-- hacky signal that we're called from internal_process_error(), and not to omit stack frames
return error(fmt[1]:format(unpack(args)))
else
return error(fmt:format(unpack(args)), 3)
end
end
local function internal_process_error(fmt, ...)
fmt = "Internal error in `params` table: " .. fmt
process_error({fmt}, ...)
end
-------------------------------------- Value conversion -----------------------------
-- For a list parameter `name` and corresponding value `list_name` of the `list` field (which should have the same value
-- as `name` if `list = true` was given), generate a pattern to match parameters of the list and store the pattern as a
-- key in `patterns`, with corresponding value set to `name`. For example, if `list_name` is "tr", the pattern will
-- match "tr" as well as "tr1", "tr2", ..., "tr10", "tr11", etc. If the `list_name` contains a \1 in it, the numeric
-- portion goes in place of the \1. For example, if `list_name` is "f\1accel", the pattern will match "faccel",
-- "f1accel", "f2accel", etc. Any \1 in `name` is removed before storing into `patterns`.
local function save_pattern(name, list_name, patterns)
name = type(name) == "string" and gsub(name, "\1", "") or name
if match(list_name, "\1") then
patterns["^" .. gsub(pattern_escape(list_name), "\1", "([1-9]%%d*)") .. "$"] = name
else
patterns["^" .. pattern_escape(list_name) .. "([1-9]%d*)$"] = name
end
end
-- Convert a list in `list` to a string, separating the final element from the preceding one(s) by `conjunction`. If
-- `dump_vals` is given, pass all values in `list` through mw.dumpObject() (WARNING: this destructively modifies
-- `list`). This is similar to serialCommaJoin() in [[Module:table]] when used with the `dontTag = true` option, but
-- internally uses mw.text.listToText().
local function concat_list(list, conjunction, dump_vals)
if dump_vals then
for i = 1, #list do
list[i] = dump(list[i])
end
end
return list_to_text(list, nil, conjunction)
end
-- Helper function for use with convert_val_error(). Format a list of possible choices using `concat_list` and
-- conjunction "or", displaying "either " before the choices if there's more than one.
local function format_choice_list(typ)
return (#typ > 1 and "either " or "") .. concat_list(typ, " or ")
end
-- Signal an error for a value `val` that is not of the right typ `typ` (which is either a string specifying a type or
-- a list of possible values, in the case where `set` was used). `name` is the name of the parameter and can be a
-- function to signal an error (which is assumed to automatically display the parameter's name and value). `seetext` is
-- an optional additional explanatory link to display (e.g. [[WT:LOL]], the list of possible languages and codes).
local function convert_val_error(val, name, typ, seetext)
if is_callable(name) then
if type(typ) == "table" then
typ = "choice, must be " .. format_choice_list(typ)
end
name(("Invalid %s; the value %s is not valid%s"):format(typ, val, seetext and "; see " .. seetext or ""))
else
if type(typ) == "table" then
typ = "must be " .. format_choice_list(typ)
else
typ = "should be a valid " .. typ
end
error(("Parameter %s %s; the value %s is not valid.%s"):format(dump(name), typ, dump(val),
seetext and " See " .. seetext .. "." or ""))
end
end
-- Convert a value that is not a string or number to a string using mw.dumpObject(), for debugging purposes.
local function dump_if_unusual(val)
local val_type = type(val)
return (val_type == "string" or val_type == "number") and val or dump(val)
end
-- A helper function for use with generating error-signaling functions in the presence of raw value conversion. Format a
-- message `msg`, including the processed value `processed` if it is different from the raw value `rawval`; otherwise,
-- just return `msg`.
local function msg_with_processed(msg, rawval, processed)
if rawval == processed then
return msg
else
return ("%s (processed value %s)"):format(msg, dump_if_unusual(processed))
end
end
-- Generate the appropriate error-signaling function given parameter value `val` and name `name`. If `name` is already
-- a function, it is just returned; otherwise a function is generated and returned that displays the passed-in messaeg
-- along with the parameter's name and value.
local function make_parse_err(val, name)
if is_callable(name) then
return name
else
return function(msg)
error(("%s: parameter %s=%s"):format(msg, name, val))
end
end
end
-- A reimplementation of ipairs() for use in a single-variable for-loop (like with gsplit()) instead of a two-variable
-- for-loop (like with ipairs()). If we changed the return statement below to `return index, list[index]`, we'd get
-- ipairs() directly.
local function iterate_over_list(list)
local index, len = 0, #list
return function()
index = index + 1
if index <= len then
return list[index]
end
end
end
-- A helper function for use with `sublist`. It is an iterator function for use in a for-loop that returns split
-- elements of `val` using `sublist` (a Lua split pattern; boolean `true` to split on commas optionally surrounded by
-- whitespace; "comma without whitespace" to split only on commas not followed by whitespace which have not been escaped
-- by a backslash; or a function to do the splitting, which is passed two values, the value to split and a function to
-- signal an error, and should return a list of the split elements). `name` is the parameter name or error-signaling
-- function passed into convert_val().
local function split_sublist(val, name, sublist)
if sublist == true then
sublist = "%s*,%s*"
elseif sublist == "comma without whitespace" then
sublist = split_on_comma_without_whitespace
end
if type(sublist) == "string" then
return gsplit(val, sublist)
elseif is_callable(sublist) then
local retval = sublist(val, make_parse_err(val, name))
return iterate_over_list(retval)
else
error(('Internal error: Expected `sublist` to be of type "string" or "function" or boolean `true`, but saw %s'):format(dump(sublist)))
end
end
-- For parameter named `name` with value `val` and param spec `param`, if the `set` field is specified, verify that the
-- value is one of the one specified in `set`, and throw an error otherwise. `name` is taken directly from the
-- corresponding parameter passed into convert_val() and may be a function to signal an error. Optional `typ` is a
-- string specifying the conversion type of `val` and is used for special-casing: If `typ` is "boolean", an internal
-- error is thrown (since `set` cannot be used in conjunction with booleans) and if `typ` is "number", no checking
-- happens because in this case `set` contains numbers and is checked inside the number conversion function itself,
-- after converting `val` to a number.
local function check_set(val, name, param, typ)
if typ == "boolean" then
error(('Internal error: Cannot use `set` with `type = "%s"`'):format(typ))
end
if typ == "number" then
-- Needs to be special cased because the check happens after conversion to numbers.
return
end
if not param.set[val] then
local list = {}
for k in pairs(param.set) do
insert(list, dump(k))
end
sort(list)
-- If the parameter is not required then put "or empty" at the end of the list, to avoid implying the parameter is actually required.
if not param.required then
insert(list, "empty")
end
convert_val_error(val, name, list)
end
end
local function convert_language(val, name, param, allow_etym)
local lang = require(languages_module)[param.method == "name" and "getByCanonicalName" or "getByCode"](val, nil, allow_etym, param.family)
if lang then
return lang
end
local list = {"language"}
local links = {"[[WT:LOL]]"}
if allow_etym then
insert(list, "etymology language")
insert(links, "[[WT:LOL/E]]")
end
if param.family then
insert(list, "family")
insert(links, "[[WT:LOF]]")
end
convert_val_error(val, name, concat_list(list, " or ") .. " " .. (param.method == "name" and "name" or "code"),
concat_list(links, " and "))
end
--[==[ func: export.convert_val(val, name, param)
Convert a parameter value according to the associated specs listed in the `params` table passed to
[[Module:parameters]]. `val` is the value to convert for a parameter whose name is `name` (used only in error messages).
`param` is the spec (the value part of the `params` table for the parameter). In place of passing in the parameter name,
`name` can be a function that throws an error, displaying the specified message along with the parameter name and value.
This function processes all the conversion-related fields in `param`, including `type`, `set`, `sublist`, `convert`,
etc. It returns the converted value.
]==]
local convert_val = setmetatable({
["boolean"] = function(val)
return yesno(val, true)
end,
["family"] = function(val, name, param)
return require(families_module)[param.method == "name" and "getByCanonicalName" or "getByCode"](val) or
convert_val_error(val, name, "family " .. (param.method == "name" and "name" or "code"), "[[WT:LOF]]")
end,
["labels"] = function(val, name, param)
-- FIXME: Should be able to pass in a parse_err function.
return require(labels_module).split_labels_on_comma(val)
end,
["references"] = function(val, name, param)
return require(references_module).parse_references(val, make_parse_err(val, name))
end,
["qualifier"] = function(val, name, param)
return {val}
end,
["language"] = function(val, name, param)
return convert_language(val, name, param, true)
end,
["full language"] = function(val, name, param)
return convert_language(val, name, param)
end,
["number"] = function(val, name, param)
if type(val) == "number" then
return val
end
-- Avoid converting inputs like "nan" or "inf", and disallow 0x hex inputs unless explicitly enabled
-- with `allow_hex`.
val = tonumber(
match(val, "^[+-]?%d+%.?%d*$") or
param.allow_hex and match(val, "^[+-]?0[Xx]%x+%.?%x*$")
) or convert_val_error(val, name, "number")
if param.set then
-- Don't pass in "number" here; otherwise no checking will happen.
check_set(val, name, param)
end
return val
end,
["script"] = function(val, name, param)
return require(scripts_module)[param.method == "name" and "getByCanonicalName" or "getByCode"](val) or
convert_val_error(val, name, "script " .. (param.method == "name" and "name" or "code"), "[[WT:LOS]]")
end,
["string"] = function(val, name, param)
return val
end,
["title"] = function(val, name, param)
val = tostring(val)
local namespace, title = param.namespace
if param.strict then
-- Always applies the namespace prefix.
title = make_title(namespace or 0, val)
else
-- Applies the namespace prefix if `val` doesn't contain one already.
title = new_title(val, namespace)
-- If the input starts with an interwiki prefix, the returned title will be an interwiki title. If `namespace` is specified and not the mainspace, force the title to be a namespace title instead (e.g. "el:All topics" with namespace = 14 returns "el:Category:All topics", but we want "Category:el:All topics" instead).
if title and title.isExternal and namespace and namespace ~= 0 then
title = make_title(namespace, val)
end
end
return is_valid_title(title) and title or convert_val_error(val, name, "Wiktionary page title")
end,
["wikimedia language"] = function(val, name, param)
local fallback = param.method == "fallback"
local lang = require(wikimedia_languages_module)[fallback and "getByCodeWithFallback" or "getByCode"](val)
if lang then
return lang
end
local list = {"wikimedia language"}
if fallback then
insert(list, "language")
end
convert_val_error(val, name, concat_list(list, " or ") .. " code")
end,
}, {
__call = function(self, val, name, param)
local typ = param.type or "string"
-- If param.type is a function, resolve it to a recognized type.
if is_callable(typ) then
typ = typ(val)
end
local func, sublist = self[typ], param.sublist
if not func then
error("Internal error: " .. dump(typ) .. " is not a recognized parameter type.")
elseif sublist then
local retlist = {}
if type(val) ~= "string" then
error("Internal error: " .. dump(val) .. " is not a string.")
end
if param.convert then
local thisval, insval
local thisindex = 0
local parse_err
if is_callable(name) then
-- We assume the passed-in error function in `name` already shows the parameter name and raw value.
parse_err = function(msg)
name(("%s: item #%s=%s"):format(msg_with_processed(msg, thisval, insval), thisindex,
thisval))
end
else
parse_err = function(msg)
error(("%s: item #%s=%s of parameter %s=%s"):format(msg_with_processed(msg, thisval, insval),
thisindex, thisval, name, val))
end
end
for v in split_sublist(val, name, sublist) do
thisval = v
thisindex = thisindex + 1
if param.set then
check_set(v, name, param, typ)
end
insval = func(v, name, param)
insert(retlist, param.convert(insval, parse_err))
end
else
for v in split_sublist(val, name, sublist) do
if param.set then
check_set(v, name, param, typ)
end
insert(retlist, func(v, name, param))
end
end
return retlist
else
if param.set then
check_set(val, name, param, typ)
end
local retval = func(val, name, param)
if param.convert then
local parse_err
if is_callable(name) then
-- We assume the passed-in error function in `name` already shows the parameter name and raw value.
if retval == val then
-- This is an optimization to avoid creating a closure. The second arm works correctly even
-- when retval == val.
parse_err = name
else
parse_err = function(msg)
name(msg_with_processed(msg, val, retval))
end
end
else
parse_err = function(msg)
error(("%s: parameter %s=%s"):format(msg_with_processed(msg, val, retval), name, val))
end
end
retval = param.convert(retval, parse_err)
end
return retval
end
end
})
export.convert_val = convert_val -- used by [[Module:parameter utilities]]
local function unknown_param(name, val, args_unknown, return_unknown)
if not return_unknown then
process_error("Parameter %s is not used by this template.", name)
end
args_unknown[name] = val
track("unknown")
end
local function check_demo_param()
if current_namespace == 2 or is_invoke_page then
return true
elseif current_namespace ~= 10 and current_namespace ~= 828 then -- Template: and Module:
return false
elseif ( -- Template or module documentation page.
current_title == frame_title .. "/documentation" or
parent_frame_title and current_title == parent_frame_title .. "/documentation"
) then
return true
end
return false
end
local function check_string_param(typ, name, tag)
if typ and typ ~= "string" then
internal_process_error(
"%s cannot be set unless the parameter has the type %s (the default): parameter %s has the type %s.",
tag, "string", name, typ)
end
end
--[==[
Process arguments with a given list of parameters. Return a table containing the processed arguments. The `args`
parameter specifies the arguments to be processed; they are the arguments you might retrieve from
{frame:getParent().args} (the template arguments) or in some cases {frame.args} (the invocation arguments). The `params`
parameter specifies a list of valid parameters, and consists of a table. If an argument is encountered that is not in
the parameter table, an error is thrown.
The structure of the `params` table is as described above in the intro comment.
'''WARNING:''' The `params` table is destructively modified to save memory. Nonetheless, different keys can share the
same value objects in memory without causing problems.
The `return_unknown` parameter, if set to {true}, prevents the function from triggering an error when it comes across an
argument with a name that it doesn't recognise. Instead, the return value is a pair of values: the first is the
processed arguments as usual, while the second contains all the unrecognised arguments that were left unprocessed. This
allows you to do multi-stage processing, where the entire set of arguments that a template should accept is not known at
once. For example, an inflection-table might do some generic processing on some arguments, but then defer processing of
the remainder to the function that handles a specific inflectional type.
]==]
function export.process(args, params, return_unknown)
-- Process parameters for specific properties
local args_new = {}
local param_types = {}
local required = {}
local patterns = {}
local has_placeholder = {}
local list_from_index
for name, param in pairs(params) do
local param_type = type(param)
param_types[param] = param_type
if param_type == "table" then
-- Populate required table, and make sure aliases aren't set to required.
if param.required then
if param.alias_of then
internal_process_error(
"Parameter %s is an alias of %s, but is also set as a required parameter. Only %s should be set as required.",
name, param.alias_of, name)
end
required[name] = true
end
-- Convert param.set from a list into a set.
-- `converted_set` prevents double-conversion if multiple parameter keys share the same param table.
-- rawset avoids errors if param has been loaded via mw.loadData; however, it's probably more efficient to preconvert them, and set the `converted_set` key in advance.
local set = param.set
if set and not param.converted_set then
rawset(param, "set", list_to_set(set))
rawset(param, "converted_set", true)
end
local alias = param.alias_of
if alias then
-- Check that the alias_of is set to a valid parameter.
if not params[alias] then
internal_process_error("Parameter %s is an alias of an invalid parameter.", name)
end
-- Check that all the parameters in params are in the form Scribunto normalizes input argument keys into (e.g. 1 not "1", "foo" not " foo "). Otherwise, this function won't be able to normalize the input arguments in the expected way.
local normalized = scribunto_param_key(alias)
if alias ~= normalized then
internal_process_error(
"Parameter %s (a " .. type(alias) .. ") given in the alias_of field of parameter %s is not a normalized Scribunto parameter. Should be %s (a " .. type(normalized) .. ").",
alias, name, normalized)
end
local main_param = params[alias]
local main_type = type(main_param) -- Might not yet be memoized.
-- Aliases can't be lists unless the canonical parameter is also a list.
if param.list and not (main_type == "table" and main_param.list) then
internal_process_error(
"The list parameter %s is set as an alias of %s, which is not a list parameter.", name, alias)
-- Aliases can't be aliases of other aliases.
elseif main_type == "table" and main_param.alias_of then
internal_process_error(
"alias_of cannot be set to another alias: parameter %s is set as an alias of %s, which is in turn an alias of %s. Set alias_of for %s to %s.",
name, alias, params[alias].alias_of, name, params[alias].alias_of)
end
end
local normalized = scribunto_param_key(name)
if name ~= normalized then
internal_process_error(
"Parameter %s (a " .. type(name) .. ") is not a normalized Scribunto parameter. Should be %s (a " ..
type(normalized) .. ").",
name, normalized)
end
if param.list then
if not param.alias_of then
local key = name
if type(name) == "string" then
key = gsub(name, "\1", "")
end
-- _list is used as a temporary flag.
args_new[key] = {maxindex = 0, _list = param.list}
end
if type(param.list) == "string" then
-- If the list property is a string, then it represents the name
-- to be used as the prefix for list items. This is for use with lists
-- where the first item is a numbered parameter and the
-- subsequent ones are named, such as 1, pl2, pl3.
save_pattern(name, param.list, patterns)
elseif type(name) == "number" then
if list_from_index then
internal_process_error(
"Only one numeric parameter can be a list, unless the list property is a string.")
end
-- If the name is a number, then all indexed parameters from
-- this number onwards go in the list.
list_from_index = name
else
save_pattern(name, name, patterns)
end
if match(name, "\1") then
insert(has_placeholder, name)
end
end
elseif param ~= true then
internal_process_error("Spec for parameter %s must be a table of specs or the value true, but found %s.", name, param_type ~= "boolean" and param_type or param)
end
end
--Process required changes to `params`.
for i = 1, #has_placeholder do
local name = has_placeholder[i]
params[gsub(name, "\1", "")] = params[name]
params[name] = nil
end
-- Process the arguments
local args_unknown = {}
for name, val in pairs(args) do
local orig_name, raw_type, index, normalized = name, type(name)
if raw_type == "number" then
if list_from_index ~= nil and name >= list_from_index then
index = name - list_from_index + 1
name = list_from_index
end
else
-- Does this argument name match a pattern?
for pattern, pname in pairs(patterns) do
index = match(name, pattern)
-- It matches, so store the parameter name and the
-- numeric index extracted from the argument name.
if index then
index = tonumber(index)
name = pname
break
end
end
end
local param = params[name]
-- If the argument is not in the list of parameters, trigger an error.
-- return_unknown suppresses the error, and stores it in a separate list instead.
if not param then
unknown_param(name, val, args_unknown, return_unknown)
elseif param == true then
normalized = orig_name
val = trim(val)
if val ~= "" then
-- If the parameter is duplicated, throw an error.
if args_new[name] ~= nil then
process_error(
"Parameter %s has been entered more than once. This is probably because a parameter alias has been used.",
normalized)
end
args_new[name] = val
end
else
if param.require_index then
-- Disallow require_index for numeric parameter names, as this doesn't make sense.
if raw_type == "number" then
internal_process_error("Cannot set require_index for numeric parameter %s.", name)
-- If a parameter without the trailing index was found, and
-- require_index is set on the param, treat it
-- as if it isn't recognized.
elseif not index then
unknown_param(name, val, args_unknown, return_unknown)
end
end
-- Check that separate_no_index is not being used with a numeric parameter.
if param.separate_no_index then
if raw_type == "number" then
internal_process_error("Cannot set separate_no_index for numeric parameter %s.", name)
elseif type(param.alias_of) == "number" then
internal_process_error(
"Cannot set separate_no_index for parameter %s, as it is an alias of numeric parameter %s.",
name, param.alias_of)
end
end
-- If no index was found, use 1 as the default index.
-- This makes list parameters like g, g2, g3 put g at index 1.
-- If `separate_no_index` is set, then use 0 as the default instead.
if param.list then
index = index or param.separate_no_index and 0 or 1
end
-- Normalize to the canonical parameter name. If it's a list, but the alias is not, then determine the index.
local raw_name = param.alias_of
if param.alias_of then
raw_type = type(raw_name)
if raw_type == "number" then
local main_param = params[raw_name]
if param_types[main_param] == "table" and main_param.list then
index = index or param.separate_no_index and 0 or 1
normalized = raw_name + index - 1
else
normalized = raw_name
end
name = raw_name
else
name = gsub(raw_name, "\1", "")
local main_param = params[name]
if param_types[main_param] == "table" and main_param.list then
index = index or param.separate_no_index and 0 or 1
end
if not index or index == 0 then
normalized = name
elseif name == raw_name then
normalized = name .. index
else
normalized = gsub(raw_name, "\1", index)
end
end
else
normalized = orig_name
end
-- Only allow demo parameters if the current page contains the originating
-- {{#invoke:}}, or this is the User: namespace.
if param.demo and not check_demo_param() then
unknown_param(name, val, args_unknown, return_unknown)
end
-- Remove leading and trailing whitespace unless no_trim is true.
if param.no_trim then
check_string_param(param.type, name, "no_trim")
else
val = trim(val)
end
-- Empty string is equivalent to nil unless allow_empty is true.
if param.allow_empty then
check_string_param(param.type, name, "allow_empty")
elseif val == "" then
val = nil
end
-- Can't use "if val" alone, because val may be a boolean false.
if val ~= nil then
-- Convert to proper type if necessary.
local main_param = params[raw_name]
if not main_param or param_types[main_param] == "table" then
val = convert_val(val, orig_name, main_param or param)
end
-- Mark it as no longer required, as it is present.
required[name] = nil
-- Store the argument value.
if index then
-- If the parameter is duplicated, throw an error.
if args_new[name][index] ~= nil then
process_error(
"Parameter %s has been entered more than once. This is probably because a list parameter has been entered without an index and with index 1 at the same time, or because a parameter alias has been used.",
normalized)
end
args_new[name][index] = val
-- Store the highest index we find.
args_new[name].maxindex = max(index, args_new[name].maxindex)
if args_new[name][0] ~= nil then
args_new[name].default = args_new[name][0]
if args_new[name].maxindex == 0 then
args_new[name].maxindex = 1
end
args_new[name][0] = nil
end
if params[name].list then
-- Don't store index 0, as it's a proxy for the default.
if index > 0 then
args_new[name][index] = val
-- Store the highest index we find.
args_new[name].maxindex = max(index, args_new[name].maxindex)
end
else
args_new[name] = val
end
else
-- If the parameter is duplicated, throw an error.
if args_new[name] ~= nil then
process_error(
"Parameter %s has been entered more than once. This is probably because a parameter alias has been used.",
normalized)
end
if not param.alias_of then
args_new[name] = val
else
local main_param = params[param.alias_of]
if param_types[main_param] == "table" and main_param.list then
args_new[param.alias_of][1] = val
-- Store the highest index we find.
args_new[param.alias_of].maxindex = max(1, args_new[param.alias_of].maxindex)
else
args_new[param.alias_of] = val
end
end
end
end
end
end
-- Remove holes in any list parameters if needed.
for name, val in pairs(args_new) do
if type(val) == "table" then
local listname = val._list
if listname then
if params[name].disallow_holes then
local highest = 0
for num, _ in pairs(val) do
if type(num) == "number" and num > 0 and num < huge and floor(num) == num then
highest = max(highest, num)
end
end
for i = 1, highest do
if val[i] == nil then
if type(listname) == "string" then
listname = dump(listname)
elseif type(name) == "number" then
i = i + name - 1 -- Absolute index.
listname = "numeric"
else
listname = dump(name)
end
process_error(
"Item %s in the list of " .. listname .. " parameters cannot be empty, because the list must be contiguous.",
i)
end
end
-- Some code depends on only numeric params being present
-- when no holes are allowed (e.g. by checking for the
-- presence of arguments using next()), so remove
-- `maxindex`.
val.maxindex = nil
elseif not params[name].allow_holes then
args_new[name] = remove_holes(val)
end
end
end
end
-- If the current page is the template which invoked this Lua instance, then ignore the `require` flag, as it
-- means we're viewing the template directly. Required parameters sometimes have a `template_default` key set,
-- which gets used in such cases as a demo.
-- Note: this won't work on other pages in the Template: namespace (including the /documentation subpage),
-- or if the #invoke: is on a page in another namespace.
local is_template_page = current_namespace == 10 and is_invoke_page
local pagename_set = args_new.pagename
-- Handle defaults.
for name, param in pairs(params) do
if param_types[param] == "table" then
local default_val
-- If both `template_default` and `default` are given, `template_default` takes precedence, but only on
-- template pages. This lets you specify a different default as the template page example.
-- HACK: We still run into problems on documentation pages transcluded into the template page when pagename= is
-- set. Check this on the assumption that pagename= is fairly standard.
if is_template_page and not pagename_set then
default_val = param.template_default
end
if default_val == nil then
default_val = param.default
end
if default_val ~= nil then
local arg_new = args_new[name]
if type(arg_new) == "table" and arg_new._list then
if arg_new[1] == nil then
arg_new[1] = convert_val(default_val, name, param)
end
if arg_new.maxindex == 0 then
arg_new.maxindex = 1
end
arg_new._list = nil
elseif arg_new == nil then
args_new[name] = convert_val(default_val, name, param)
end
end
end
end
-- The required table should now be empty.
-- If any entry remains, trigger an error, unless we're on a template page.
if not is_template_page then
local list = {}
for name in pairs(required) do
insert(list, dump(name))
end
local n = #list
if n > 0 then
process_error("Parameter" .. (
n == 1 and (" " .. list[1] .. " is") or
("s " .. concat_list(list, " and ", true) .. " are")
) .. " required.")
end
end
-- Remove the temporary _list flag.
for _, arg_new in pairs(args_new) do
if type(arg_new) == "table" then
arg_new._list = nil
end
end
if return_unknown then
return args_new, args_unknown
else
return args_new
end
end
return export