Help:Extension:ParserFunctions/pt-br

Se a extensão foi instalada na sua wiki, ela fornece onze funções adicionais ao analisador sintático, que suplementam as palavras mágicas já presentes no MediaWiki. Todas as funções fornecidas pela extensão têm a forma:
 *  

#expr
Esta função calcula a expressão matemática e retorna o resultado.


 *  

Os operadores matemáticos disponíveis estão listados na tabela da direita, por ordem crescente de precedência. Para mais detalhes sobre cada operador, consulte.

Nos operadores de, o número zero assume o valor lógico «falso» (0). Qualquer outro número, positivo ou negativo, assume o valor lógico «verdadeiro» (1).


 *   → 
 *   → 

Uma expressão de entrada vazia retorna uma string vazia. Expressões inválidas retornam uma das várias mensagens de erro, que podem ser capturadas com a função #iferror:


 *  </tt> →  
 *  </tt> → 
 *  </tt> → 

A ordem dos operandos de adição e subtração, antes ou depois de um número, é significativa, e pode ser tratada como um valor positivo ou negativo, em vez de como um operando com uma entrada errada:


 *  </tt> → 
 *  </tt> → 
 *  </tt> → 
 *  </tt> → 

Note que, se estiver usando a saída de palavras mágicas, você deve formatá-las, a fim de remover vírgulas e traduzir os numerais. Por exemplo resulta em , onde desejamos  que pode ser obtido por. Isto é especialmente importante em algumas línguas, onde números são traduzidos. Por exemplo, no idioma Bengali, produz,  como resultado, ৩০,০৬১.


 *  </tt> →  
 *  </tt> → 

Arredondamento
Arredonda o número do lado esquerdo a um múltiplo de 1/10 elevado a uma potência, com o expoente igual ao valor truncado de um dado número do lado direito.

Para arredondar para cima ou para baixo usar os operadores unários  or   respectivamente.

#if
Esta função avalia uma seqüência de teste e determina se é ou não é vazio. Uma seqüência de teste que contém apenas espaço em branco é considerado vazio.


 *  </tt>


 *  </tt>

Esta função primeiramente testa se o primeiro parâmetro não está vazio. Se o primeiro parâmetro não estiver vazio a função exibe o segundo argumento. Se o primeiro parâmetro estiver vazio ou contiver apenas espaços em branco (espaços, quebras de linha, etc) ele exibe o terceiro argumento.


 *  </tt> → 
 *  </tt> → 
 *  </tt> → 
 *  </tt> → 

A string de teste sempre será interpretada como texto puro, então expressões matemáticas não serão avaliadas:


 *  </tt> → 
 * <tt> </tt> → 

Um ou outro ou ambos os valores de retorno podem ser omitidos:


 * <tt> </tt> →  
 * <tt> </tt> →  
 * <tt> </tt> →  

A função pode ser aninhada. Para isso, aninhe a função #if interior em sua forma integral no lugar do terceiro parâmetro da função delimitadora #if. A profundidade de pelo menos sete níveis de aninhamento é possível, apesar de que pode depender do wiki ou de um limite de memória.
 * Exemplo: <tt> </tt>

Veja Parser functions in templates para mais exemplos dessa função analisadora.

#ifeq
Esta função do analisador compara duas strings e determina se elas são idênticas.


 * <tt> </tt>

Se ambas as strings são valores numéricos válidos, as strings são comparadas numericamente:


 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 

Caso contrário, a comparação é feita como texto; esta comparação é case sensitive:


 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> →   (comparar a exemplo semelhante anteriormente, sem as aspas)
 * <tt> </tt> →   (comparar com o exemplo semelhante acima, com <tt>#expr</tt>)

Como um exemplo prático, dada uma predefinição existente <tt>Template:Size</tt> usado para definir tamanhos curtos e longos padronizados, definidos como:

acontecerá o seguinte:


 * <tt> </tt> → 20
 * <tt> </tt> → 40
 * <tt> </tt> → 40

#iferror
Esta função recebe uma string de entrada e retorna um de dois resultados; a função avalia a <tt>true</tt> se a string de entrada contém um objeto HTML com <tt>class="error"</tt>, como gerada por outras funções do analisador, tais como <tt>#expr</tt>, <tt>#time</tt> e <tt>#rel2abs</tt>, erros de predefinições, tais como loops e recursões, e outros erros do analisador do tipo failsoft.


 * <tt> </tt>

Uma ou ambas as strings de retorno podem ser omitidas. Se a string <tt>correct</tt> is omitida, the <tt>string de teste</tt> é retornada se não estiver errada. Se a string de <tt>erro</tt> também é omitida, uma string vazia é retornada com erro:


 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → &zwnj;
 * <tt> </tt> → 

#ifexpr
Esta função avalia uma expressão matemática e retorna uma de duas strings, dependendo do valor booleano do resultado:


 * <tt> </tt>

A <tt>expressão</tt> de entrada é avaliada exatamente como para <tt>#expr</tt> acima, com os mesmos operadores que estão disponíveis. A saída é, então, avaliada como uma expressão booleana.

Uma expressão de entrada vazia é avaliada como <tt>false</tt>:


 * <tt> </tt> → 

As mentioned above, zero evaluates to <tt>false</tt> and any nonzero value evaluates to <tt>true</tt>, so this function is equivalent to one using <tt>#ifeq</tt> and <tt>#expr</tt> only:


 * <tt> </tt>

except for an empty or wrong input expression (an error message is treated as an empty string; it is not equal to zero, so we get <tt>value if true</tt>).
 * <tt> </tt> →  

comparing
 * <tt> </tt> →  

Either or both the return values may be omitted; no output is given when the appropriate branch is left empty:


 * <tt> </tt> → 
 * <tt> </tt> →  
 * <tt> </tt> →  
 * <tt> </tt> →  
 * <tt> </tt> →  
 * <tt> </tt> →  

#ifexist
This function takes an input string, interprets it as a page title, and returns one of two values depending on whether or not the page exists on the local wiki.


 * <tt> </tt>

The function evaluates to <tt>true</tt> if the page exists, whether it contains content, is visibly blank (contains meta-data such as category links or magic words, but no visible content), is blank, or is a redirect. Only pages that are redlinked evaluate to false, including if the page used to exist but has been deleted.


 * <tt> </tt> → 
 * <tt> </tt> → 

The function evaluates to true for system messages that have been customized, and for special pages that are defined by the software.


 * <tt> </tt> → 
 * <tt> </tt> →
 * <tt> </tt> →

If a page checks a target using <tt>#ifexist:</tt>, then that page will appear in the list for the target page. So if the code <tt> </tt> were included live on this page, /Foo will list.

On wikis using a shared media repository, <tt>#ifexist:</tt> can be used to check if a file has been uploaded to the repository, but not to the wiki itself:
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 

If a local description page has been created for the file, the result is exists for all of the above.

<tt>#ifexist:</tt> does not work with interwiki links.

ifexist limits
<tt>#ifexist:</tt> is considered an "expensive parser function"; only a limited number of which can be included on any one page (including functions inside transcluded templates). When this limit is exceeded, any further <tt>#ifexist:</tt> functions automatically return false, whether the target page exists or not, and the page is categorized into Category:. The name of the tracking category may vary depending on the content language of your wiki.

For some use cases it is possible to emulate the ifexist effect with css, by using the selectors <tt>a.new</tt> (to select links to unexisting pages) or <tt>a:not(.new)</tt> (to select links to existing pages). Furthermore, since the number of expensive parser functions that can be used on a single page is controlled by $wgExpensiveParserFunctionLimit, one can also increase the limit in LocalSettings.php if needed.

#rel2abs
This function converts a relative file path into an absolute filepath.


 * <tt> </tt>
 * <tt> </tt>

Within the <tt>path</tt> input, the following syntax is valid:
 * → the current level
 * → "go up one level"
 * → "go down one level into the subdirectory /foo"

If the <tt>base path</tt> is not specified, the full page name of the page will be used instead:


 * <tt> </tt> → '''
 * <tt> </tt> → '''
 * <tt> </tt> → '''
 * <tt> </tt> → '''

Invalid syntax, such as <tt>/.</tt> or <tt>/./</tt>, is ignored. Since no more than two consecutive full stops are permitted, sequences such as these can be used to separate successive statements:


 * <tt> </tt> → '''
 * <tt> </tt> → '''
 * <tt> </tt> → '''
 * <tt> </tt> → '''

#switch
This function compares one input value against several test cases, returning an associated string if a match is found.

Examples:


 * <tt> </tt> →   
 * <tt> </tt> →   
 * <tt> </tt> →   


 * 1) switch allows an editor to add information in one template and this information will be visible in several other templates which all have different formatting.

Default
The <tt>default result</tt> is returned if no <tt>case</tt> string matches the <tt>comparison string</tt>:


 * <tt> </tt> →   

In this syntax, the default result must be the last parameter and must not contain a raw equals sign.


 * <tt> </tt> →   
 * <tt> </tt> →   

Alternatively, the default result may be explicitly declared with a <tt>case</tt> string of "<tt>#default</tt>".

Default results declared in this way may be placed anywhere within the function:


 * <tt> </tt> →   

If the <tt>default</tt> parameter is omitted and no match is made, no <tt>result</tt> is returned:


 * <tt> </tt> →   

Grouping results
It is possible to have 'fall through' values, where several <tt>case</tt> strings return the same <tt>result</tt> string. This minimizes duplication.

Here cases 2, 3 and 4 all return <tt>result2</tt>; cases 6 and 7 both return <tt>result4</tt>

Comparison behavior
As with <tt>#ifeq</tt>, the comparison is made numerically if both the comparison string and the case string being tested are numeric; or as a case-sensitive string otherwise:


 * <tt> </tt> → 
 * <tt> </tt> → 


 * <tt> </tt> → 
 * <tt> </tt> → 

A <tt>case</tt> string may be empty:
 * <tt> </tt> → 

Once a match is found, subsequent <tt>cases</tt> are ignored:
 * <tt> </tt> → 

Raw equal signs
"Case" strings cannot contain raw equals signs. To work around this, create a template = containing a single equals sign: <tt>=</tt>.

Example:


 * <tt> </tt> → 

For a simple real life example of the use of this function, check. Two complex examples can be found at and Template:BOTREQ.

Replacing #ifeq
can be used to reduce expansion depth.

For example: is equivalent to
 * (i.e. )
 * (i.e. )

#time
This parser function takes a date and/or time (in the Gregorian calendar) and formats it according to the syntax given. A date/time object can be specified; the default is the value of the magic word <tt> </tt> – that is, the time the page was last rendered into HTML.


 * <tt> </tt>
 * <tt> </tt>
 * <tt> </tt>

The list of accepted formatting codes is given in the table to the right. Any character in the formatting string that is not recognized is passed through unaltered; this applies also to blank spaces (the system does not need them for interpreting the codes). There are also two ways to escape characters within the formatting string: In addition, the digraph <tt>xx</tt> is interpreted as a single literal "x".
 * 1) A backslash followed by a formatting character is interpreted as a single literal character
 * 2) Characters enclosed in double quotes are considered literal characters, and the quotes are removed.


 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 

The <tt>date/time object</tt> can be in any format accepted by PHP's strtotime function. Both absolute (eg <tt>20 December 2000</tt>) and relative (eg <tt>+20 hours</tt>) times are accepted.

<tt> </tt> → '''

<tt> </tt> → '''

<tt> </tt> → '''

The language code in ISO 639-3 (?) allows the string to be displayed in the chosen language <tt> </tt> → '''

<tt> </tt> → '''

<tt> </tt> → ''' '''

If you've calculated a Unix timestamp, you may use it in date calculations by pre-pending an <tt>@</tt> symbol.

<tt> </tt> → '''

<tt> </tt> → '''

Full or partial absolute dates can be specified; the function will "fill in" parts of the date that are not specified using the current values:


 * <tt> </tt> → '''

With MediaWiki r86805 - Code Review, a four-digit number is always interpreted as a year, never as hours and minutes:

<tt> </tt> → '''

A six-digit number is interpreted as hours, minutes and seconds if possible, but otherwise as an error (not, for instance, a year and month):

<tt> </tt> → ''' Input is treated as a time rather than a year+month code.

<tt> </tt> → ''' Although 19:60:09 is not a valid time, 196009 is not interpreted as September 1960.

The function performs a certain amount of date mathematics:


 * <tt> </tt> → '''
 * <tt> </tt> → '''
 * <tt> </tt> → '''
 * <tt> </tt> → '''
 * <tt> </tt> → '''

The total length of the format strings of the calls of  is limited to 6000 characters.

Time Zone issue
There is a bug in this #time parser function (more specifically in PHP DateTime) that does not allow the passing-in of non-integers as relative time zone offsets. This issue does not apply when using an on-the-hour time zone, such as EDT. For example:

However, Venezuela is on a -4.5 hours time offset from UTC, and thus using its time zone will not normally allow the correct calculation of a relative time zone offset. Here's what happens: To workaround this issue, simply convert the time into minutes or seconds, like this:

(Tim Starling, the developer of this function, provided the exact syntax for this solution.)

#timel
This function is identical to <tt> </tt>, except that it uses the local time of the wiki (as set in ) when no date is given.


 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 

#titleparts
This function separates a pagetitle into segments based on slashes, then returns some of those segments as output.


 * <tt> </tt>

If the <tt>number of segments</tt> parameter is not specified, it defaults to "0", which returns all the segments from first segment (included). If the <tt>first segment</tt> parameter is not specified or is "0", it defaults to "1":


 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 
 * <tt> </tt> → 

Negative values are accepted for both values. Negative values for <tt>number of segments</tt> effectively 'strips' segments from the end of the string. Negative values for <tt>first segment</tt> translates to "start with this segment counting from the right":


 * <tt> </tt> →  Strips one segment from the end of the string. See also.
 * <tt> </tt> →   Strips all 4 segments from the end of the string
 * <tt> </tt> →   Strips 5 segments from the end of the string (more than exist)
 * <tt> </tt> →   Returns last segment. See also.
 * <tt> </tt> →   Strips one segment from the end of the string, then returns the second segment and beyond
 * <tt> </tt> →   Start copying at the second last element; strip one segment from the end of the string

The string is split a maximum of 25 times; further slashes are ignored and the 25th element will contain the rest of the string. The string is also limited to 255 characters, as it is treated as a page title:


 * <tt> </tt> → 

If for whatever reason you needed to push this function to its limit, although very unlikely, it is possible to bypass the 25 split limit by nesting function calls:


 * <tt> </tt> → 

You can use #titleparts as a small "string parser & converter", but consider that it returns the first substring capitalized.


 * <tt> </tt> → 
 * <tt> </tt> → 


 * If lower case is needed, use lc: function to control output.
 * <tt> </tt> → 


 * You can prepend a 'dummy' slash at the beginning of the string to get the correct first substring capitalization (uppercase or lowercase). Use |2 instead of |1 for <tt>first segment to return</tt>.
 * <tt> </tt> → 
 * <tt> </tt> → 

Certain characters that are illegal in a page title will cause #titleparts to not parse the string.
 * <tt> </tt> → . Does not produce the expected: {one


 * <tt> </tt> → 

This function does not degrade gracefully if your input exceeds 255 characters. If the inputted string is 256 characters long or more, this function will simply toss the string back at you.

Substitution
Parser functions can be substituted by prefixing the hash character with <tt>subst:</tt>:


 * <tt> </tt> → the code <tt>    </tt> will be inserted in the wikitext since the page  exists.

Redirects
Especially   could be handy in redirects to pages including dates, but this does not work.

Escaping pipe characters in tables
Parser functions will mangle wikitable syntax and pipe characters, treating all the raw pipe characters as parameter dividers. To avoid this, most wikis create the template    :! with its contents only a raw pipe character. This 'hides' the pipe from the MediaWiki parser, ensuring that it is not considered until after all the templates and variables on a page have been expanded. It will then be interpreted as a table row or column separator. Alternatively, raw HTML table syntax can be used, although this is less intuitive and more error-prone.

You can also escape the pipe character for display as a plain, uninterpreted character using an HTML entity:.

Stripping whitespace
Whitespace, including newlines, tabs, and spaces, is stripped from the beginning and end of all the parameters of these parser functions. If this is not desirable, comparison of strings can be done after putting them in quotation marks.





For preventing trimming then- and else-parts, see m:Template:If. Some people use also &lt; nowiki &gt; &lt; /nowiki &gt; instead of spaces.