- Hermes - : creation

2021-10-13T17:24:28Z

creation

Nouvelle page

--[[

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
[Category:Errors reported by Module String].

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 Module:String/tests.
]]

local str = {}

--[[
len

This function returns the length of the target string.

Usage:
{{#invoke:String|len|target_string|}}
OR
{{#invoke:String|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:String|sub|target_string|start_index|end_index}}
OR
{{#invoke:String|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.

Usage:
{{#invoke:String|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}
OR
{{#invoke:String|pos|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

]]
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']

if s == '' then
-- return str._error( 'Target string is empty' )
end
if pattern == '' then
return str._error( 'Pattern string is empty' )
end
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

--[[
pos

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

Usage:
{{#invoke:String|pos|target_string|index_value}}
OR
{{#invoke:String|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

--[[
find

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

Usage:
{{#invoke:String|find|source_str|target_string|start_index|plain_flag}}
OR
{{#invoke:String|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:String|replace|source_str|pattern_string|replace_string|replacement_count|plain_flag}}
OR
{{#invoke:String|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

--[[
simpletitle

This function returns the current page title without the homonymy part (the part in parenthesis).

Usage:
{{#invoke:String|simpletitle}}
OR
{{#invoke:String|simpletitle|string}}

Parameters
string: if present this function will treat this string as the title of the page and remove
homonymy part if present in it. If not given the function uses the page title (without namespace)
]]
function str.simpletitle(frame)
-- si un paramètre est indiqué, on l'utilise comme titre à traiter
-- sinon on utilise le titre de la page actuelle
local page = frame.args[1]
if (page == nil or page == "") then
page = mw.title.getCurrentTitle().text
end

-- on enlève la partie entre parenthèses
local npage = mw.ustring.gsub(page, " [(][^()]*[)]$", "")
if (npage == nil or npage == "") then return "" end

return npage
end

--[[
titledisambig

This function returns the part of the title used for disambiguation,
including the parenthesis themselves and the space just before.

Usage:
{{#invoke:String|titledisambig}}
OR
{{#invoke:String|titledisambig|string}}

Parameters
string: if present this function will treat this string as the title of the page.
If not given the function uses the page title.
]]
function str.titledisambig(frame)
-- si un paramètre est indiqué, on l'utilise comme titre à traiter
-- sinon on utilise le titre de la page actuelle
local page = frame.args[1]
if (page == nil or page == "") then
page = mw.title.getCurrentTitle().text
end

-- on retourne la partie entre parenthèses,
-- en incluant les parenthèses et l'espace précédente
local disambigStart = string.find(page, " %(")
if disambigStart then
return string.sub(page, disambigStart)
else
return ""
end
end

--[[
trim

Cette fonction retourne son unique paramètre en supprimant les espaces
et sauts de ligne au début et à la fin (fonction "trim")

Usage :
{{#invoke:String|trim|string}}

Paramètres :
la chaîne 'string' dont on veut supprimer les éventuels espaces
et sauts de ligne au début et/ou à la fin
]]
function str.trim(frame)
local txt = frame.args[1]
if not txt or txt == "" then
return ""
end
return mw.text.trim(txt)
end

--[[
rep

Cette fonction retourne la concaténation de son premier paramètre n fois où n est le deuxième paramètre (fonction "rep" ou "repeat")

Usage :
{{#invoke:String|rep|string|int}}

Paramètres :
la chaîne 'string' dont on veut répeter
l'entier 'int' le nombre d'itération
]]
function str.rep(frame)
local new_args = str._getParameters( frame.args, { 's', 'n' } )
local s = new_args['s'] or ''
local n = tonumber( new_args['n'] ) or 1
if not s or s == '' then
return ''
end
if not n or n <0 then
return s
end
return mw.ustring.rep(s,n)
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

for i = 1, #arg_list do
local arg = arg_list[i]
local 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 'Errors reported by Module String'
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 = '[[Category:' .. 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

--[[
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

return str

Module:String - Historique des versions

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