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{{i}} Документація модуля[створити]
local u = {}

local z = {
  error_categories = {}; -- for categorizing citations that contain errors
  error_ids = {};
  message_tail = {};
  maintenance_cats = {}; -- for categorizing citations that aren't erroneous perse, but could use a little work
  properties_cats = {}; -- for categorizing citations based on certain properties, language of source for instance
};

--[[---------------------< 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 slected 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.
This function is global because it is called from both this module and from Date validation
]]

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

--[[---------------------< S U B S T I T U T E >-----------------------------------------------------
Populates numbered arguments in a message string using an argument table.
]]

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.
]]

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

--[[----------------------< S E T _ E R R O R >------------------------------------------------------
Sets an error condition and returns the appropriate error message.  The actual placement of the error message in the output is
the responsibility of the calling function.
]]

local function set_error( 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'] );
  elseif is_set( error_state.category ) then
    table.insert( z.error_categories, error_state.category );
  end
  local message = substitute( error_state.message, arguments );
  message = message .. " ([[" .. cfg.messages['help page link'] .. "#" .. error_state.anchor .. "|" .. cfg.messages['help page label'] .. "]])";
  z.error_ids[ error_id ] = true;
  if in_array( error_id, { 'bare_url_missing_title', 'trans_missing_title' } ) and z.error_ids['citation_missing_title'] then
    return '', false;
  end
  message = table.concat({ prefix, message, suffix });
  if raw == true then
    return message, error_state.hidden;
  end
  return error_comment( message, error_state.hidden );
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 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.maintenance_cats 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.maintenance_cats.
]]

local added_maint_cats = {} -- list of maintenance categories that have been added to z.maintenance_cats
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.maintenance_cats, substitute (cfg.maint_cats [key], arguments)); -- make name then add to table
  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 <i> 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, <i> and '' tend to interact
poorly under Mediawiki's HTML tidy.
]]

local function safe_for_italics( str )
  if not is_set(str) then return str;
  else
    if str:sub(1,1) == "'" then str = "<span></span>" .. str; end
    if str:sub(-1,-1) == "'" then str = str .. "<span></span>"; end
-- Remove newlines as they break italics.
    return str:gsub( '\n', ' ' );
  end
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

--[[---------------------< 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 |<param>1= is an alias of |<param>= 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()
    local error_str = "";
    for _, k in ipairs( error_list ) do
      if error_str ~= "" then error_str = error_str .. cfg.messages['parameter separator'] end
      error_str = error_str .. wrap_style ('parameter', k);
    end
    if #error_list > 1 then
      error_str = error_str .. cfg.messages['parameter-final-separator'];
    else
      error_str = error_str .. cfg.messages['parameter-pair-separator'];
    end
      error_str = error_str .. wrap_style ('parameter', selected);
    table.insert( z.message_tail, { set_error( error_condition, {error_str}, true ) } );
  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
]=]

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



return { -- return exported functions and tables
  is_set = is_set,
  in_array = in_array,
  substitute = substitute,
  error_comment = error_comment,
  set_error = set_error,
  select_one = select_one,
  add_maint_cat = add_maint_cat,
  wrap_style = wrap_style;
  safe_for_italics = safe_for_italics;
  remove_wiki_link = remove_wiki_link;
  set_selected_modules = set_selected_modules;
  z = z,
  }