Module:Citation/CS1/Utilities

local z = { error_cats_t = {};															-- for categorizing citations that contain errors error_ids_t = {};															-- list of error identifiers; used to prevent duplication of certain errors; local to this module error_msgs_t = {};															-- sequence table of error messages maint_cats_t = {};															-- for categorizing citations that aren't erroneous per se, but could use a little work prop_cats_t = {};															-- for categorizing citations based on certain properties, language of source for instance prop_keys_t = {};															-- for adding classes to the citation's tag };

----< F O R W A R D  D E C L A R A T I O N S >--

local cfg;																		-- table of tables imported from selected Module:Citation/CS1/Configuration

--[[--< I S _ S E T >--

Returns true if argument is set; false otherwise. Argument is 'set' when it exists (not nil) or when it is not an empty string.

]]

local function is_set (var) return not (var == nil or var == ''); end

--[[--< I N _ A R R A Y >--

Whether needle is in haystack

]]

local function in_array (needle, haystack) if needle == nil then return false; end for n, v in ipairs (haystack) do		if v == needle then return n;		end end return false; end

--[[--< H A S _ A C C E P T _ A S _ W R I T T E N >

When is wholly wrapped in accept-as-written markup, return without markup and true; return and false else

with allow_empty = false, must have at least one character inside the markup with allow_empty = true, the markup frame can be empty like () to distinguish an empty template parameter from the specific condition "has no applicable value" in citation-context.

After further evaluation the two cases might be merged at a later stage, but should be kept separated for now.

]]

local function has_accept_as_written (str, allow_empty) if not is_set (str) then return str, false; end

local count;

if true == allow_empty then str, count = str:gsub ('^%(%((.*)%)%)$', '%1'); 						-- allows () to be an empty set else str, count = str:gsub ('^%(%((.+)%)%)$', '%1'); end return str, 0 ~= count; end

--[[--< S U B S T I T U T E >--

Populates numbered arguments in a message string using an argument table. may be a single string or a sequence table of multiple strings.

]]

local function substitute (msg, args) return args and mw.message.newRawMessage (msg, args):plain or msg; end

--[[--< E R R O R _ C O M M E N T >

Wraps error messages with CSS markup according to the state of hidden. may be a single string or a sequence table of multiple strings.

]]

local function error_comment (content, hidden) return substitute (hidden and cfg.presentation['hidden-error'] or cfg.presentation['visible-error'], content); end

--[[--< H Y P H E N _ T O _ D A S H >--

Converts a hyphen to a dash under certain conditions. The hyphen must separate like items; unlike items are returned unmodified. These forms are modified: letter - letter (A - B)	digit - digit (4-5) digit separator digit - digit separator digit (4.1-4.5 or 4-1-4-5) letterdigit - letterdigit (A1-A5) (an optional separator between letter and		digit is supported – a.1-a.5 or a-1-a-5) digitletter - digitletter (5a - 5d) (an optional separator between letter and		digit is supported – 5.a-5.d or 5-a-5-d)

any other forms are returned unmodified.

str may be a comma- or semicolon-separated list

]]

local function hyphen_to_dash (str) if not is_set (str) then return str; end

local accept;																-- boolean

str = str:gsub ("(%(%(.-%)%))", function(m) return m:gsub(",", "，"):gsub(";", "；") end) -- replace commas and semicolons in accept-as-written markup with similar unicode characters so they'll be ignored during the split str = str:gsub ('&[nm]dash;', {['–'] = '–', ['&mdash;'] = '—'});		-- replace &mdash; and – entities with their characters; semicolon mucks up the text.split str = str:gsub ('&#45;', '-'); -- replace HTML numeric entity with hyphen character str = str:gsub (' ', ' '); -- replace  entity with generic keyboard space character local out = {}; local list = mw.text.split (str, '%s*[,;]%s*');								-- split str at comma or semicolon separators if there are any

for _, item in ipairs (list) do												-- for each item in the list item, accept = has_accept_as_written (item);							-- remove accept-this-as-written markup when it wraps all of item if not accept and mw.ustring.match (item, '^%w*[%.%-]?%w+%s*[%-–—]%s*%w*[%.%-]?%w+$') then	-- if a hyphenated range or has endash or emdash separators if item:match ('^%a+[%.%-]?%d+%s*%-%s*%a+[%.%-]?%d+$') or			-- letterdigit hyphen letterdigit (optional separator between letter and digit) item:match ('^%d+[%.%-]?%a+%s*%-%s*%d+[%.%-]?%a+$') or			-- digitletter hyphen digitletter (optional separator between digit and letter) item:match ('^%d+[%.%-]%d+%s*%-%s*%d+[%.%-]%d+$') or			-- digit separator digit hyphen digit separator digit item:match ('^%d+%s*%-%s*%d+$') or								-- digit hyphen digit item:match ('^%a+%s*%-%s*%a+$') then							-- letter hyphen letter item = item:gsub ('(%w*[%.%-]?%w+)%s*%-%s*(%w*[%.%-]?%w+)', '%1–%2');	-- replace hyphen, remove extraneous space characters else item = mw.ustring.gsub (item, '%s*[–—]%s*', '–');				-- for endash or emdash separated ranges, replace em with en, remove extraneous whitespace end end table.insert (out, item);												-- add the (possibly modified) item to the output table end

local temp_str = '';														-- concatenate the output table into a comma separated string temp_str, accept = has_accept_as_written (table.concat (out, ', '));		-- remove accept-this-as-written markup when it wraps all of concatenated out if accept then temp_str = has_accept_as_written (str);									-- when global markup removed, return original str; do it this way to suppress boolean second return value return temp_str:gsub("，", ","):gsub("；", ";"); else return temp_str:gsub("，", ","):gsub("；", ";");						-- else, return assembled temp_str end end

--[=[-< M A K E _ W I K I L I N K >

Makes a wikilink; when both link and display text is provided, returns a wikilink in the form L|D; if only link is provided (or link and display are the same), returns a wikilink in the form L; if neither are provided or link is omitted, returns an empty string.

]=]

local function make_wikilink (link, display) if not is_set (link) then return '' end

if is_set (display) and link ~= display then return table.concat ({, display, }); else return table.concat ({, link, }); end end

--[[--< S E T _ M E S S A G E >--

Sets an error message using the ~/Configuration error_conditions{} table along with arguments supplied in the function call, inserts the resulting message in z.error_msgs_t{} sequence table, and returns the error message.

 – key value for appropriate error handler in ~/Configuration error_conditions{} table – may be a single string or a sequence table of multiple strings to be subsititued into error_conditions[error_id].message – boolean true –	causes this function to return the error message not wrapped in visible-error, hidden-error span tag; returns error_conditions[error_id].hidden as a second return value does not add message to z.error_msgs_t sequence table false, nil – adds message wrapped in visible-error, hidden-error span tag to z.error_msgs_t returns the error message wrapped in visible-error, hidden-error span tag; there is no second return value – string to be prepended to 									-- TODO: remove support for these unused(?) arguments? – string to be appended to

TODO: change z.error_cats_t and z.maint_cats_t to have the form cat_name = true? this to avoid dups without having to have an extra table

]]

local added_maint_cats = {}														-- list of maintenance categories that have been added to z.maint_cats_t; TODO: figure out how to delete this table

local function set_message (error_id, arguments, raw, prefix, suffix) local error_state = cfg.error_conditions[error_id]; prefix = prefix or ''; suffix = suffix or ''; if error_state == nil then error (cfg.messages['undefined_error'] .. ': ' .. error_id);			-- because missing error handler in Module:Citation/CS1/Configuration

elseif is_set (error_state.category) then if error_state.message then												-- when error_state.message defined, this is an error message table.insert (z.error_cats_t, error_state.category); else if not added_maint_cats[error_id] then added_maint_cats[error_id] = true;								-- note that we've added this category table.insert (z.maint_cats_t, substitute (error_state.category, arguments));	-- make cat name then add to table end return;																-- because no message, nothing more to do		end end

local message = substitute (error_state.message, arguments);

message = table.concat (		{		message,		' (', make_wikilink (			table.concat ( {				cfg.messages['help page link'], '#',				error_state.anchor }),			cfg.messages['help page label']), ')'		});

z.error_ids_t[error_id] = true; if z.error_ids_t['err_citation_missing_title'] and							-- if missing-title error already noted in_array (error_id, {'err_bare_url_missing_title', 'err_trans_missing_title'}) then		-- and this error is one of these return '', false;													-- don't bother because one flavor of missing title is sufficient end message = table.concat ({prefix, message, suffix});

if true == raw then return message, error_state.hidden;										-- return message not wrapped in visible-error, hidden-error span tag end

message = error_comment (message, error_state.hidden);						-- wrap message in visible-error, hidden-error span tag table.insert (z.error_msgs_t, message);										-- add it to the messages sequence table return message;																-- and done; return value generally not used but is used as a flag in various functions of ~/Identifiers end

--[[-< I S _ A L I A S _ U S E D >-

This function is used by select_one to determine if one of a list of alias parameters is in the argument list provided by the template.

Input: args – pointer to the arguments table from calling template alias – one of the list of possible aliases in the aliases lists from Module:Citation/CS1/Configuration index – for enumerated parameters, identifies which one enumerated – true/false flag used to choose how enumerated aliases are examined value – value associated with an alias that has previously been selected; nil if not yet selected selected – the alias that has previously been selected; nil if not yet selected error_list – list of aliases that are duplicates of the alias already selected

Returns: value – value associated with alias we selected or that was previously selected or nil if an alias not yet selected selected – the alias we selected or the alias that was previously selected or nil if an alias not yet selected

]]

local function is_alias_used (args, alias, index, enumerated, value, selected, error_list) if enumerated then															-- is this a test for an enumerated parameters? alias = alias:gsub ('#', index);										-- replace '#' with the value in index else alias = alias:gsub ('#', '');											-- remove '#' if it exists end

if is_set (args[alias]) then												-- alias is in the template's argument list if value ~= nil and selected ~= alias then								-- if we have already selected one of the aliases local skip; for _, v in ipairs (error_list) do									-- spin through the error list to see if we've added this alias if v == alias then skip = true; break;														-- has been added so stop looking end end if not skip then													-- has not been added so				table.insert (error_list, alias);								-- add error alias to the error list end else value = args[alias];												-- not yet selected an alias, so select this one selected = alias; end end return value, selected;														-- return newly selected alias, or previously selected alias end

--[[--< A D D _ M A I N T _ C A T >--

Adds a category to z.maint_cats_t using names from the configuration file with additional text if any. To prevent duplication, the added_maint_cats table lists the categories by key that have been added to z.maint_cats_t.

]]

local function add_maint_cat (key, arguments) if not added_maint_cats [key] then added_maint_cats [key] = true;											-- note that we've added this category table.insert (z.maint_cats_t, substitute (cfg.maint_cats [key], arguments));	-- make name then add to table end end

--[[--< A D D _ P R O P _ C A T >

Adds a category to z.prop_cats_t using names from the configuration file with additional text if any.

foreign_lang_source and foreign_lang_source_2 keys have a language code appended to them so that multiple languages may be categorized but multiples of the same language are not categorized.

added_prop_cats is a table declared in page scope variables above

]]

local added_prop_cats = {};														-- list of property categories that have been added to z.prop_cats_t

local function add_prop_cat (key, arguments, key_modifier) local key_modified = key .. ((key_modifier and key_modifier) or '');		-- modify with  if present and not nil if not added_prop_cats [key_modified] then added_prop_cats [key_modified] = true;									-- note that we've added this category table.insert (z.prop_cats_t, substitute (cfg.prop_cats [key], arguments));	-- make name then add to table table.insert (z.prop_keys_t, 'cs1-prop-' .. key);						-- convert key to class for use in the citation's tag end end

--[[--< S A F E _ F O R _ I T A L I C S >--

Protects a string that will be wrapped in wiki italic markup '' ... ''

Note: We cannot use  for italics, as the expected behavior for italics specified by ... in the title is that they will be inverted (i.e. unitalicized) in the resulting references. In addition,  and '' tend to interact poorly under Mediawiki's HTML tidy.

]]

local function safe_for_italics (str) if not is_set (str) then return str end

if str:sub (1, 1) == "'" then str = " " .. str; end if str:sub (-1, -1) == "'" then str = str .. " "; end return str:gsub ('\n', ' ');												-- Remove newlines as they break italics. end

--[[--< W R A P _ S T Y L E >--

Applies styling to various parameters. Supplied string is wrapped using a message_list configuration taking one argument; protects italic styled parameters. Additional text taken from citation_config.presentation - the reason this function is similar to but separate from wrap_msg.

]]

local function wrap_style (key, str) if not is_set (str) then return ""; elseif in_array (key, {'italic-title', 'trans-italic-title'}) then str = safe_for_italics (str); end

return substitute (cfg.presentation[key], {str}); end

--[[--< M A K E _ S E P _ L I S T >

make a separated list of items using provided separators.  - typically ' '  - typically ' and '  - typically ' and ' or '  & '

defaults to cfg.presentation['sep_list'], cfg.presentation['sep_list_pair'], and cfg.presentation['sep_list_end'] if  is specified,  and  must also be supplied

]]

local function make_sep_list (count, list_seq, sep_list, sep_list_pair, sep_list_end) local list = '';

if not sep_list then														-- set the defaults sep_list = cfg.presentation['sep_list']; sep_list_pair = cfg.presentation['sep_list_pair']; sep_list_end = cfg.presentation['sep_list_end']; end if 2 >= count then list = table.concat (list_seq, sep_list_pair);							-- insert separator between two items; returns list_seq[1] then only one item elseif 2 < count then list = table.concat (list_seq, sep_list, 1, count - 1);					-- concatenate all but last item with plain list separator list = table.concat ({list, list_seq[count]}, sep_list_end);			-- concatenate last item onto end of with final separator end return list; end

--[[--< S E L E C T _ O N E >--

Chooses one matching parameter from a list of parameters to consider. The list of parameters to consider is just names. For parameters that may be enumerated, the position of the numerator in the parameter name is identified by the '#' so |author-last1= and |author1-last= are represented as 'author-last#' and 'author#-last'.

Because enumerated parameter | 1= is an alias of | = we must test for both possibilities.

Generates an error if more than one match is present.

]]

local function select_one (args, aliases_list, error_condition, index) local value = nil;															-- the value assigned to the selected parameter local selected = '';														-- the name of the parameter we have chosen local error_list = {};

if index ~= nil then index = tostring(index); end

for _, alias in ipairs (aliases_list) do									-- for each alias in the aliases list if alias:match ('#') then												-- if this alias can be enumerated if '1' == index then												-- when index is 1 test for enumerated and non-enumerated aliases value, selected = is_alias_used (args, alias, index, false, value, selected, error_list);	-- first test for non-enumerated alias end value, selected = is_alias_used (args, alias, index, true, value, selected, error_list);	-- test for enumerated alias else value, selected = is_alias_used (args, alias, index, false, value, selected, error_list);	-- test for non-enumerated alias end end

if #error_list > 0 and 'none' ~= error_condition then						-- for cases where this code is used outside of extract_names for i, v in ipairs (error_list) do			error_list[i] = wrap_style ('parameter', v); end table.insert (error_list, wrap_style ('parameter', selected)); set_message (error_condition, {make_sep_list (#error_list, error_list)}); end return value, selected; end

--[=[-< R E M O V E _ W I K I _ L I N K >--

Gets the display text from a wikilink like A|B or B gives B

The str:gsub returns either A|B froma A|B or B from B or B from B (no wikilink markup).

In l, l:gsub removes the link and pipe (if they exist); the second :gsub trims whitespace from the label if str was wrapped in wikilink markup. Presumably, this is because without wikimarkup in str, there is no match in the initial gsub, the replacement function l doesn't get called.

]=]

local function remove_wiki_link (str) return (str:gsub ("%[%[([^%[%]]*)%]%]", function(l) return l:gsub ("^[^|]*|(.*)$", "%1" ):gsub ("^%s*(.-)%s*$", "%1"); end)); end

--[=[-< I S _ W I K I L I N K >

Determines if str is a wikilink, extracts, and returns the wikilink type, link text, and display text parts. If str is a complex wikilink (L|D): returns wl_type 2 and D and L from L|D; if str is a simple wikilink (D) returns wl_type 1 and D from D and L as empty string; if not a wikilink: returns wl_type 0, str as D, and L as empty string.

trims leading and trailing whitespace and pipes from L and D (L| and |D are accepted by MediaWiki and treated like D; while |D is not accepted by MediaWiki, here, we accept it and return D without the pipes).

]=]

local function is_wikilink (str) local D, L	local wl_type = 2;															-- assume that str is a complex wikilink L|D

if not str:match ('^%[%^%+%]%]$') then									-- is str some sort of a wikilink (must have some sort of content) return 0, str, '';														-- not a wikilink; return wl_type as 0, str as D, and empty string as L	end L, D = str:match ('^%[%[([^|]+)|([^%]]+)%]%]$');							-- get L and D from L|D

if not is_set (D) then														-- if no separate display D = str:match ('^%[%[([^%]]*)|*%]%]$');									-- get D from D or D| wl_type = 1; end D = mw.text.trim (D, '%s|');												-- trim white space and pipe characters return wl_type, D, L or ''; end

--[[--< S T R I P _ A P O S T R O P H E _ M A R K U P >

Strip wiki italic and bold markup from argument so that it doesn't contaminate COinS metadata. This function strips common patterns of apostrophe markup. We presume that editors who have taken the time to markup a title have, as a result, provided valid markup. When they don't, some single apostrophes are left behind.

Returns the argument without wiki markup and a number; the number is more-or-less meaningless except as a flag to indicate that markup was replaced; do not rely on it as an indicator of how many of any kind of markup was removed; returns the argument and nil when no markup removed

]]

local function strip_apostrophe_markup (argument) if not is_set (argument) then return argument, nil;													-- no argument, nothing to do	end

if nil == argument:find ( "''", 1, true ) then								-- Is there at least one double apostrophe? If not, exit. return argument, nil; end

local flag; while true do		if argument:find ("'", 1, true) then								-- bold italic (5) argument, flag = argument:gsub ("%'%'%'%'%'", "");					-- remove all instances of it		elseif argument:find ("", 1, true) then								-- italic start and end without content (4) argument, flag=argument:gsub ("%'%'%'%'", ""); elseif argument:find ("'''", 1, true) then								-- bold (3) argument, flag=argument:gsub ("%'%'%'", ""); elseif argument:find ("''", 1, true) then								-- italic (2) argument, flag = argument:gsub ("%'%'", ""); else break; end end

return argument, flag;														-- done end

--[[--< S E T _ S E L E C T E D _ M O D U L E S >--

Sets local cfg table to same (live or sandbox) as that used by the other modules.

]]

local function set_selected_modules (cfg_table_ptr) cfg = cfg_table_ptr; end

----< E X P O R T S >

return { add_maint_cat = add_maint_cat,												-- exported functions add_prop_cat = add_prop_cat, error_comment = error_comment, has_accept_as_written = has_accept_as_written, hyphen_to_dash = hyphen_to_dash, in_array = in_array, is_set = is_set, is_wikilink = is_wikilink, make_sep_list = make_sep_list, make_wikilink = make_wikilink, remove_wiki_link = remove_wiki_link, safe_for_italics = safe_for_italics, select_one = select_one, set_message = set_message, set_selected_modules = set_selected_modules, strip_apostrophe_markup = strip_apostrophe_markup, substitute = substitute, wrap_style = wrap_style,

z = z,																		-- exported table }