Ogled vira Modul:Niz

--[[

This module is intended to provide access to basic string functions.

Most of the functions provided here can be invoked with named parameters,
unnamed parameters, or a mixture.  If named parameters are used, Mediawiki will
automatically remove any leading or trailing whitespace from the parameter.
Depending on the intended use, it may be advantageous to either preserve or
remove such whitespace.

Global options
    ignore_errors: If set to 'true' or 1, any error condition will result in
        an empty string being returned rather than an error message.

    error_category: If an error occurs, specifies the name of a category to
        include with the error message.  The default category is
        [Kategorija:Napake, ki jih javlja Modul Niz].

    no_category: If set to 'true' or 1, no category will be added if an error
        is generated.

Unit tests for this module are available at Modul:Niz/tests.
]]

local str = {}

--[[
len

This function returns the length of the target string.

Usage:
{{#invoke:Niz|len|target_string|}}
OR
{{#invoke:Niz|len|s=target_string}}

Parameters
    s: The string whose length to report

If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the target string.
]]
function str.len( frame )
	local new_args = str._getParameters( frame.args, {'s'} )
	local s = new_args['s'] or ''
	return mw.ustring.len( s )
end

--[[
sub

This function returns a substring of the target string at specified indices.

Usage:
{{#invoke:Niz|sub|target_string|start_index|end_index}}
OR
{{#invoke:Niz|sub|s=target_string|i=start_index|j=end_index}}

Parameters
    s: The string to return a subset of
    i: The fist index of the substring to return, defaults to 1.
    j: The last index of the string to return, defaults to the last character.

The first character of the string is assigned an index of 1.  If either i or j
is a negative value, it is interpreted the same as selecting a character by
counting from the end of the string.  Hence, a value of -1 is the same as
selecting the last character of the string.

If the requested indices are out of range for the given string, an error is
reported.
]]
function str.sub( frame )
	local new_args = str._getParameters( frame.args, { 's', 'i', 'j' } )
	local s = new_args['s'] or ''
	local i = tonumber( new_args['i'] ) or 1
	local j = tonumber( new_args['j'] ) or -1

	local len = mw.ustring.len( s )

	-- Convert negatives for range checking
	if i < 0 then
		i = len + i + 1
	end
	if j < 0 then
		j = len + j + 1
	end

	if i > len or j > len or i < 1 or j < 1 then
		return str._error( 'String subset index out of range' )
	end
	if j < i then
		return str._error( 'String subset indices out of order' )
	end

	return mw.ustring.sub( s, i, j )
end

--[[
This function implements that features of {{str sub old}} and is kept in order
to maintain these older templates.
]]
function str.sublength( frame )
	local i = tonumber( frame.args.i ) or 0
	local len = tonumber( frame.args.len )
	return mw.ustring.sub( frame.args.s, i + 1, len and ( i + len ) )
end

--[[
_match

This function returns a substring from the source string that matches a
specified pattern. It is exported for use in other modules

Usage:
strmatch = require("Module:String")._match
sresult = strmatch( s, pattern, start, match, plain, nomatch )

Parameters
    s: The string to search
    pattern: The pattern or string to find within the string
    start: The index within the source string to start the search.  The first
        character of the string has index 1.  Defaults to 1.
    match: In some cases it may be possible to make multiple matches on a single
        string.  This specifies which match to return, where the first match is
        match= 1.  If a negative number is specified then a match is returned
        counting from the last match.  Hence match = -1 is the same as requesting
        the last match.  Defaults to 1.
    plain: A flag indicating that the pattern should be understood as plain
        text.  Defaults to false.
    nomatch: If no match is found, output the "nomatch" value rather than an error.

For information on constructing Lua patterns, a form of [regular expression], see:

* http://www.lua.org/manual/5.1/manual.html#5.4.1
* http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns
* http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Ustring_patterns

]]
-- This sub-routine is exported for use in other modules
function str._match( s, pattern, start, match_index, plain_flag, nomatch )
	if s == '' then
		return str._error( 'Target string is empty' )
	end
	if pattern == '' then
		return str._error( 'Pattern string is empty' )
	end
	start = tonumber(start) or 1
	if math.abs(start) < 1 or math.abs(start) > mw.ustring.len( s ) then
		return str._error( 'Requested start is out of range' )
	end
	if match_index == 0 then
		return str._error( 'Match index is out of range' )
	end
	if plain_flag then
		pattern = str._escapePattern( pattern )
	end

	local result
	if match_index == 1 then
		-- Find first match is simple case
		result = mw.ustring.match( s, pattern, start )
	else
		if start > 1 then
			s = mw.ustring.sub( s, start )
		end

		local iterator = mw.ustring.gmatch(s, pattern)
		if match_index > 0 then
			-- Forward search
			for w in iterator do
				match_index = match_index - 1
				if match_index == 0 then
					result = w
					break
				end
			end
		else
			-- Reverse search
			local result_table = {}
			local count = 1
			for w in iterator do
				result_table[count] = w
				count = count + 1
			end

			result = result_table[ count + match_index ]
		end
	end

	if result == nil then
		if nomatch == nil then
			return str._error( 'Match not found' )
		else
			return nomatch
		end
	else
		return result
	end
end

--[[
match

This function returns a substring from the source string that matches a
specified pattern.

Usage:
{{#invoke:Niz|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
OR
{{#invoke:Niz|match|s=source_string|pattern=pattern_string|start=start_index
    |match=match_number|plain=plain_flag|nomatch=nomatch_output}}

Parameters
    s: The string to search
    pattern: The pattern or string to find within the string
    start: The index within the source string to start the search.  The first
        character of the string has index 1.  Defaults to 1.
    match: In some cases it may be possible to make multiple matches on a single
        string.  This specifies which match to return, where the first match is
        match= 1.  If a negative number is specified then a match is returned
        counting from the last match.  Hence match = -1 is the same as requesting
        the last match.  Defaults to 1.
    plain: A flag indicating that the pattern should be understood as plain
        text.  Defaults to false.
    nomatch: If no match is found, output the "nomatch" value rather than an error.

If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from each string.  In some circumstances this is desirable, in
other cases one may want to preserve the whitespace.

If the match_number or start_index are out of range for the string being queried, then
this function generates an error.  An error is also generated if no match is found.
If one adds the parameter ignore_errors=true, then the error will be suppressed and
an empty string will be returned on any failure.

For information on constructing Lua patterns, a form of [regular expression], see:

* http://www.lua.org/manual/5.1/manual.html#5.4.1
* http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns
* http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Ustring_patterns

]]
-- This is the entry point for #invoke:Niz|match
function str.match( frame )
	local new_args = str._getParameters( frame.args, {'s', 'pattern', 'start', 'match', 'plain', 'nomatch'} )
	local s = new_args['s'] or ''
	local start = tonumber( new_args['start'] ) or 1
	local plain_flag = str._getBoolean( new_args['plain'] or false )
	local pattern = new_args['pattern'] or ''
	local match_index = math.floor( tonumber(new_args['match']) or 1 )
	local nomatch = new_args['nomatch']

	return str._match( s, pattern, start, match_index, plain_flag, nomatch )
end

--[[
pos

This function returns a single character from the target string at position pos.

Usage:
{{#invoke:Niz|pos|target_string|index_value}}
OR
{{#invoke:Niz|pos|target=target_string|pos=index_value}}

Parameters
    target: The string to search
    pos: The index for the character to return

If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the target string.  In some circumstances this is desirable, in
other cases one may want to preserve the whitespace.

The first character has an index value of 1.

If one requests a negative value, this function will select a character by counting backwards
from the end of the string.  In other words pos = -1 is the same as asking for the last character.

A requested value of zero, or a value greater than the length of the string returns an error.
]]
function str.pos( frame )
	local new_args = str._getParameters( frame.args, {'target', 'pos'} )
	local target_str = new_args['target'] or ''
	local pos = tonumber( new_args['pos'] ) or 0

	if pos == 0 or math.abs(pos) > mw.ustring.len( target_str ) then
		return str._error( 'String index out of range' )
	end

	return mw.ustring.sub( target_str, pos, pos )
end

--[[
str_find

This function duplicates the behavior of {{str_find}}, including all of its quirks.
This is provided in order to support existing templates, but is NOT RECOMMENDED for
new code and templates.  New code is recommended to use the "find" function instead.

Returns the first index in "source" that is a match to "target".  Indexing is 1-based,
and the function returns -1 if the "target" string is not present in "source".

Important Note: If the "target" string is empty / missing, this function returns a
value of "1", which is generally unexpected behavior, and must be accounted for
separatetly.
]]
function str.str_find( frame )
	local new_args = str._getParameters( frame.args, {'source', 'target'} )
	local source_str = new_args['source'] or ''
	local target_str = new_args['target'] or ''

	if target_str == '' then
		return 1
	end

	local start = mw.ustring.find( source_str, target_str, 1, true )
	if start == nil then
		start = -1
	end

	return start
end

--[[
find

This function allows one to search for a target string or pattern within another
string.

Usage:
{{#invoke:Niz|find|source_str|target_string|start_index|plain_flag}}
OR
{{#invoke:Niz|find|source=source_str|target=target_str|start=start_index|plain=plain_flag}}

Parameters
    source: The string to search
    target: The string or pattern to find within source
    start: The index within the source string to start the search, defaults to 1
    plain: Boolean flag indicating that target should be understood as plain
        text and not as a Lua style regular expression, defaults to true

If invoked using named parameters, Mediawiki will automatically remove any leading or
trailing whitespace from the parameter.  In some circumstances this is desirable, in
other cases one may want to preserve the whitespace.

This function returns the first index >= "start" where "target" can be found
within "source".  Indices are 1-based.  If "target" is not found, then this
function returns 0.  If either "source" or "target" are missing / empty, this
function also returns 0.

This function should be safe for UTF-8 strings.
]]
function str.find( frame )
	local new_args = str._getParameters( frame.args, {'source', 'target', 'start', 'plain' } )
	local source_str = new_args['source'] or ''
	local pattern = new_args['target'] or ''
	local start_pos = tonumber(new_args['start']) or 1
	local plain = new_args['plain'] or true

	if source_str == '' or pattern == '' then
		return 0
	end

	plain = str._getBoolean( plain )

	local start = mw.ustring.find( source_str, pattern, start_pos, plain )
	if start == nil then
		start = 0
	end

	return start
end

--[[
replace

This function allows one to replace a target string or pattern within another
string.

Usage:
{{#invoke:Niz|replace|source_str|pattern_string|replace_string|replacement_count|plain_flag}}
OR
{{#invoke:Niz|replace|source=source_string|pattern=pattern_string|replace=replace_string|
   count=replacement_count|plain=plain_flag}}

Parameters
    source: The string to search
    pattern: The string or pattern to find within source
    replace: The replacement text
    count: The number of occurences to replace, defaults to all.
    plain: Boolean flag indicating that pattern should be understood as plain
        text and not as a Lua style regular expression, defaults to true
]]
function str.replace( frame )
	local new_args = str._getParameters( frame.args, {'source', 'pattern', 'replace', 'count', 'plain' } )
	local source_str = new_args['source'] or ''
	local pattern = new_args['pattern'] or ''
	local replace = new_args['replace'] or ''
	local count = tonumber( new_args['count'] )
	local plain = new_args['plain'] or true

	if source_str == '' or pattern == '' then
		return source_str
	end
	plain = str._getBoolean( plain )

	if plain then
		pattern = str._escapePattern( pattern )
		replace = mw.ustring.gsub( replace, "%%", "%%%%" ) --Only need to escape replacement sequences.
	end

	local result

	if count ~= nil then
		result = mw.ustring.gsub( source_str, pattern, replace, count )
	else
		result = mw.ustring.gsub( source_str, pattern, replace )
	end

	return result
end

--[[
    simple function to pipe string.rep to templates.
]]
function str.rep( frame )
	local repetitions = tonumber( frame.args[2] )
	if not repetitions then
		return str._error( 'function rep expects a number as second parameter, received "' .. ( frame.args[2] or '' ) .. '"' )
	end
	return string.rep( frame.args[1] or '', repetitions )
end

--[[
escapePattern

This function escapes special characters from a Lua string pattern. See [1]
for details on how patterns work.

[1] https://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns

Usage:
{{#invoke:Niz|escapePattern|pattern_string}}

Parameters
    pattern_string: The pattern string to escape.
]]
function str.escapePattern( frame )
	local pattern_str = frame.args[1]
	if not pattern_str then
		return str._error( 'No pattern string specified' )
	end
	local result = str._escapePattern( pattern_str )
	return result
end

--[[
count
This function counts the number of occurrences of one string in another.
]]
function str.count(frame)
	local args = str._getParameters(frame.args, {'source', 'pattern', 'plain'})
	local source = args.source or ''
	local pattern = args.pattern or ''
	local plain = str._getBoolean(args.plain or true)
	if plain then
		pattern = str._escapePattern(pattern)
	end
	local _, count = mw.ustring.gsub(source, pattern, '')
	return count
end

--[[
endswith
This function determines whether a string ends with another string.
]]
function str.endswith(frame)
	local args = str._getParameters(frame.args, {'source', 'pattern'})
	local source = args.source or ''
	local pattern = args.pattern or ''
	if pattern == '' then
		-- All strings end with the empty string.
		return "yes"
	end
	if mw.ustring.sub(source, -mw.ustring.len(pattern), -1) == pattern then
		return "yes"
	else
		return ""
	end
end

--[[
join

Join all non empty arguments together; the first argument is the separator.
Usage:
{{#invoke:Niz|join|sep|one|two|three}}
]]
function str.join(frame)
	local args = {}
	local sep
	for _, v in ipairs( frame.args ) do
		if sep then
			if v ~= '' then
				table.insert(args, v)
			end
		else
			sep = v
		end
	end
	return table.concat( args, sep or '' )
end


-- =================================================================
-- iz https://it.wikipedia.org/wiki/Modulo:String
-- =================================================================
-- Razred za upravljanje parametrov
-- =================================================================
local Param = {}
Param.__index = Param

function Param.new(par_name, alt_name)
    if  par_name ~= "$index" and not mw.ustring.find(par_name, '#') then par_name = par_name .. '#' end;
    return setmetatable({
        name = par_name,
        base_name = mw.ustring.gsub(par_name, ' ?#', '', 1),
        alt = alt_name
     }, Param)
end

function Param:get_other_value(args, index)
    if self.name == '$index' then
        return tostring(index), true
    else
        return args[mw.ustring.gsub(self.name, '#', tostring(index), 1)] or '', false
    end
end

function Param:get_first_value(args, index, base_index)
    function value_or_nil (s)
        if s and s ~= '' then return s end
        return nil
    end

    if self.name == '$index' then
        return tostring(index), true
    end
    if index == base_index then
        return value_or_nil(args[mw.ustring.gsub(self.name, '#', tostring(index), 1)]) or
               value_or_nil(args[self.base_name]) or value_or_nil(args[self.alt]) or '', false
    else
        return value_or_nil(args[mw.ustring.gsub(self.name, '#', tostring(index), 1)]) or
               value_or_nil(args[self.alt]) or '', false
    end
end


setmetatable(Param, { __call = function(_, ...) return Param.new(...) end })
-- =================================================================
-- Konec najave razreda za parameter
-- =================================================================

-- =================================================================
-- Razred za obdelavo sporočila
-- =================================================================
local Message = {}
Message.__index = Message

function Message.new(msg)
    -- pretvorba oglatih oklepajev, pred katerimi je bil uporabljen znak "\"
    msg = mw.ustring.gsub(msg, '\\{', '{')
    msg = mw.ustring.gsub(msg, '\\}', '}')
    local frame = mw.getCurrentFrame():getParent() or mw.getCurrentFrame()

    return setmetatable({
        msg =  msg,
        values = {},
        frame = frame,
     }, Message)
end

function Message:reset_values()
    self.values = {}
end

function Message:add_value(value)
    self.values[#self.values+1] = value
end

function Message:text()
    return self.frame:preprocess(mw.message.newRawMessage(self.msg, self.values):plain())
end

setmetatable(Message, { __call = function(_, ...) return Message.new(...) end })
-- =================================================================
-- Konec najave razreda za obdelavo sporočila
-- =================================================================

--[[
    arraytostring => Funkcija za združitev enega ali več seznamov vrednosti v niz.
    Kopirana in prevedena iz https://it.wikipedia.org/wiki/Modulo:String#arraytostring

Uporaba:
{{#invoke:Niz|arraytostring|par1=xxx|par2=xxx....|parn=xxxx|msg=msg|separator=|conjunction=|pre=|post=|list=}}

Parametri:
    par1...parn: osnovna imena parametrov, ki jih je treba vstaviti v sporočilo, morajo vsebovati znak '#', ki določa
                 položaj, na katerega se vstavi indeks. Če je nastavljen na '$index', bo imel samodejno vrednost
                 števca.
    msg: sporočilo (tj. vrstica enote), v kateri moramo pred znaki '{', '}'
         uporabiti znak '\', medtem ko je znak '|' vstavljen s predlogo {{!}}.
         Vrednosti, ki jih je treba nadomestiti, je treba vnesti kot $n ($1 bo nadomeščen z
         vrednost par1, $2 z vrednostjo par2, itd.)
    separator: Niz, ki se postavi med posamezne vrednosti
    conjunction: Niz, ki se postavi namesto separator med zadnjo in predzadnjo vrednostjo. Če
                 ni navedena, se uporabi vrednost separator
    pre: morebiten niz, ki se postavi pred zvezo nizov
    post: morebiten niz, ki se postavi po zvezi nizov
    indentation: niz, ki se kumulativno ponovi za vsako sporočilo (običajno '&nbsp')
    list: če je ovrednoten na:
                'označen' nastavi parametre za označen seznam
                'oštevilčen' nastavi parametre za oštevilčen seznam
                'infobox' nastavi združitev kot seznam, razen če obstaja
                          samo en element
                Če je list ovrednoten  separator/conjunction/pre/post se ne upoštevajo, razen v primeru 'infobox' in če
                seznam vsebuje samo en element.
    nmin = začetni indeks, od katerega se pregledujejo parametri (privzeto 1)
    nmax = največji indeks, ki se doseže s parametri (če ni določeno je neomejeno)
    Nmandatory = najmanjši indeks, ki ga je treba ovrednotiti tudi ob prisotnosti lukenj v zaporedju (vendar največji indeks
                 ki se oceni, je nmax)
    baseIndex = vrednost indeksa, ki se lahko nadomesti z ničelnim nizom (privzeto = 1)

Primeri klicanja:
     {{#invoke:Niz:arraytostring|par1=var#|separator=,|conjunction=#32;e#32;}}
     {{#invoke:Niz:arraytostring|par1=risar #|par2=risar # opomba|msg = $1 <small>$2</small>|list=infobox }}
     {{#invoke:Niz:arraytostring|par1=urednik #|par2=oznaka #|par3=urednik # opomba| msg=$1 \{\{#if:$2{{!}}$2 <small>$3</small>\}\}|list=infobox }}

]]
function str.arraytostring(frame)

    local base_args = frame.args
    local params = {}
    if not base_args then return str._error('list parametri vuota') end
    -- naložim seznam parametrov
    local index = 1
    while true do
        local par_name = base_args['par' .. index] or (index == 1 and base_args['par']) or ''
        if par_name == '' then break end
        --naložim eventuelno alternativno ime za prvi parameter
        local alt_name = base_args['altpar' .. index] or (index == 1 and base_args['altpar']) or nil
        params[index] = Param(par_name, alt_name)
        index = index + 1
    end
    --naložim sporočilo
    local msg = base_args.msg or '$1'
    --if msg == '' then return str._error('Manjka sporočilo za obnoviti.') end
    local message = Message(msg)
    elements = {}
    -- naložim druge parametre za oblikovanje
    local Nmax = tonumber(base_args.Nmax) or tonumber(base_args.nmax) or 0
    local base_index = tonumber(base_args.baseindex) or tonumber(base_args.baseIndex) or 1
    local index = tonumber(base_args.Nmin) or tonumber(base_args.nmin) or base_index
    local Nmandatory = tonumber(base_args.Nmandatory) or tonumber(base_args.Nmandatory) or base_index-1
    local indentation = base_args.indentation or nil
    local args = frame:getParent().args
    -- izvlečem prvo vrednost
    local found = false

    for i, param in ipairs(params) do
        local v, is_index = param:get_first_value(args, index, base_index)
        if (not(is_index) or base_index<=Nmandatory) and v ~= '' then found = true end
        message:add_value(mw.text.trim(v))
    end
    if found then
        elements[#elements+1] = message:text()
        index = index + 1
    end
    -- obdelam naslednje vrednosti
    while true do
        if Nmax > 0 and index > Nmax then break end
        message:reset_values()
        found = false
        for i, param in ipairs(params) do
            local v, is_index = param:get_other_value(args, index)
            if (not(is_index) or index<=Nmandatory) and v ~= '' then found = true end
            message:add_value(mw.text.trim(v))
        end
        if found then
            elements[#elements+1] = message:text()
        elseif index >= Nmandatory then
            break
        end
        index = index + 1
    end
    if #elements == 0 then return '' end
    -- naložim separators, conjunction, pre in post
    local pre, post, separator, conjunction, indent = '', '', '', '', ''
    local list = base_args.list or ''
    if list == 'označen' or (list =='infobox' and #elements >1) then
        pre = '<UL><LI>'
        post = '</LI>\n</UL>'
        separator = '</LI>\n<LI>'
        conjunction = separator
    elseif list == 'oštevilčen' then
        pre = '<OL><LI>'
        post = '</LI>\n</OL>'
        separator = '</LI>\n<LI>'
        conjunction = separator
    else
        pre = base_args.pre or ''
        post = base_args.post or ''
        separator = base_args.separator or ''
        conjunction = base_args.conjunction or separator
    end
    if indentation then
        local current_indentation = indentation
        for i, msg in ipairs(elements) do
            elements[i] = current_indentation .. elements[i]
            current_indentation = current_indentation .. indentation 
        end
    end
    return pre .. mw.text.listToText(elements, separator, conjunction) .. post
end


--[[
Helper function that populates the argument list given that user may need to use a mix of
named and unnamed parameters.  This is relevant because named parameters are not
identical to unnamed parameters due to string trimming, and when dealing with strings
we sometimes want to either preserve or remove that whitespace depending on the application.
]]
function str._getParameters( frame_args, arg_list )
	local new_args = {}
	local index = 1
	local value

	for _, arg in ipairs( arg_list ) do
		value = frame_args[arg]
		if value == nil then
			value = frame_args[index]
			index = index + 1
		end
		new_args[arg] = value
	end

	return new_args
end

--[[
Helper function to handle error messages.
]]
function str._error( error_str )
	local frame = mw.getCurrentFrame()
	local error_category = frame.args.error_category or 'Napake, ki jih javlja Modul Niz'
	local ignore_errors = frame.args.ignore_errors or false
	local no_category = frame.args.no_category or false

	if str._getBoolean(ignore_errors) then
		return ''
	end

	local error_str = '<strong class="error">String Module Error: ' .. error_str .. '</strong>'
	if error_category ~= '' and not str._getBoolean( no_category ) then
		error_str = '[[Kategorija:' .. error_category .. ']]' .. error_str
	end

	return error_str
end

--[[
Helper Function to interpret boolean strings
]]
function str._getBoolean( boolean_str )
	local boolean_value

	if type( boolean_str ) == 'string' then
		boolean_str = boolean_str:lower()
		if boolean_str == 'false' or boolean_str == 'no' or boolean_str == '0'
				or boolean_str == '' then
			boolean_value = false
		else
			boolean_value = true
		end
	elseif type( boolean_str ) == 'boolean' then
		boolean_value = boolean_str
	else
		error( 'No boolean value found' )
	end
	return boolean_value
end

--[[
Helper function that escapes all pattern characters so that they will be treated
as plain text.
]]
function str._escapePattern( pattern_str )
	return mw.ustring.gsub( pattern_str, "([%(%)%.%%%+%-%*%?%[%^%$%]])", "%%%1" )
end

return str