Module:String/Documentation

Ceci est la page de documentation de Spécial:Badtitle/Message [modifier] [purger].

Cette sous-page contient les instructions et les catégories de son spécial d'origine et elle n'est pas destinée à être visualisée directement.

Le module String (un mot anglais signifiant chaîne de caractères) permet de manipuler des chaînes de caractères.

Utilisation

Fonctions exportables :

len – renvoie le nombre de caractères dans une chaîne, prend en compte les caractères multi-octets (len ou length signifie taille, longueur)
sub – renvoie une partie de la chaîne de caractères (sub ou sub-string signifie sous-chaîne)

Autres fonctions :
À compléter…

Modules externes et autres éléments dont ce module a besoin pour fonctionner :
À compléter…

len

This function returns the length of the target string.

Usage: 13 OR 13

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.

sub

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

Usage: target_string OR target_string

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.

match

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

Usage: nomatch_output ORString Module Error: String index out of range

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:

pos

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

Usage:String Module Error: String index out of range ORString Module Error: String index out of range

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.

str_find

This function duplicates the behavior of 0, 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.

find

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

Usage: 0 OR 0

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.

replace

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

Usage: source_str OR source_string

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

simpletitle

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

Usage: Erreur de script : la fonction « simpletitle » n’existe pas. OR Erreur de script : la fonction « simpletitle » n’existe pas.

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)

Exemples

len

{{#invoke:String|len|ABCDEFGHIJ}}           renvoie 10
{{#invoke:String|len|É}}                    renvoie 1, même si É occupe 2 octets
{{#invoke:String|len| }}                    renvoie 1, les espaces blancs sont pris en compte

sub

{{#invoke:String|sub|ABCDEFGHIJ|0}}          renvoie une erreur, ici l'index commence à 1 (contrairement à d'autres langages de programmation)
{{#invoke:String|sub|ABCDEFGHIJ|5}}          renvoie EFGHIJ, on commence à partir du 5ème caractère et on prend le reste
{{#invoke:String|sub|ABCDEFGHIJ|1|3}}        renvoie ABC, on commence à partir du 1er jusqu'au 3ème
{{#invoke:String|sub|ABCDEFGHIJ|1|1}}        renvoie A
{{#invoke:String|sub|ABCDEFGHIJ|-1}}         renvoie J, l'index est inversé on commence à la fin
{{#invoke:String|sub|ABCDEFGHIJ|-5|-2}}      renvoie FGHI
{{#invoke:String|sub|ABCDEFGHIJ|-5|2}}       renvoie une erreur, l'index de fin doit être après l'index de début (2 est placé avant -5) 
{{#invoke:String|sub|ABCDEFGHIJ|-5|7}}       renvoie FGHI, l'index de fin est bien après l'index de début