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<?php
/**
* Representation of a page title within %MediaWiki.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @license GPL 2+
* @author Daniel Kinzler
*/
/**
* Represents a page (or page fragment) title within %MediaWiki.
*
* @note In contrast to Title, this is designed to be a plain value object. That is,
* it is immutable, does not use global state, and causes no side effects.
*
* @note TitleValue represents the title of a local page (or fragment of a page).
* It does not represent a link, and does not support interwiki prefixes etc.
*
* @see https://www.mediawiki.org/wiki/Requests_for_comment/TitleValue
*/
class TitleValue {
/**
* @var int
*/
protected $namespace;
/**
* @var string
*/
protected $dbkey;
/**
* @var string
*/
protected $fragment;
/**
* Constructs a TitleValue.
*
* @note TitleValue expects a valid DB key; typically, a TitleValue is constructed either
* from a database entry, or by a TitleParser. We could apply "some" normalization here,
* such as substituting spaces by underscores, but that would encourage the use of
* un-normalized text when constructing TitleValues. For constructing a TitleValue from
* user input or external sources, use a TitleParser.
*
* @param int $namespace The namespace ID. This is not validated.
* @param string $dbkey The page title in valid DBkey form. No normalization is applied.
* @param string $fragment The fragment title. Use '' to represent the whole page.
* No validation or normalization is applied.
*
* @throws InvalidArgumentException
*/
public function __construct( $namespace, $dbkey, $fragment = '' ) {
if ( !is_int( $namespace ) ) {
throw new InvalidArgumentException( '$namespace must be an integer' );
}
if ( !is_string( $dbkey ) ) {
throw new InvalidArgumentException( '$dbkey must be a string' );
}
// Sanity check, no full validation or normalization applied here!
if ( preg_match( '/^_|[ \r\n\t]|_$/', $dbkey ) ) {
throw new InvalidArgumentException( '$dbkey must be a valid DB key: ' . $dbkey );
}
if ( !is_string( $fragment ) ) {
throw new InvalidArgumentException( '$fragment must be a string' );
}
if ( $dbkey === '' ) {
throw new InvalidArgumentException( '$dbkey must not be empty' );
}
$this->namespace = $namespace;
$this->dbkey = $dbkey;
$this->fragment = $fragment;
}
/**
* @return int
*/
public function getNamespace() {
return $this->namespace;
}
/**
* @return string
*/
public function getFragment() {
return $this->fragment;
}
/**
* Returns the title's DB key, as supplied to the constructor,
* without namespace prefix or fragment.
*
* @return string
*/
public function getDBkey() {
return $this->dbkey;
}
/**
* Returns the title in text form,
* without namespace prefix or fragment.
*
* This is computed from the DB key by replacing any underscores with spaces.
*
* @note To get a title string that includes the namespace and/or fragment,
* use a TitleFormatter.
*
* @return string
*/
public function getText() {
return str_replace( '_', ' ', $this->getDBkey() );
}
/**
* Creates a new TitleValue for a different fragment of the same page.
*
* @param string $fragment The fragment name, or "" for the entire page.
*
* @return TitleValue
*/
public function createFragmentTitle( $fragment ) {
return new TitleValue( $this->namespace, $this->dbkey, $fragment );
}
/**
* Returns a string representation of the title, for logging. This is purely informative
* and must not be used programmatically. Use the appropriate TitleFormatter to generate
* the correct string representation for a given use.
*
* @return string
*/
public function __toString() {
$name = $this->namespace . ':' . $this->dbkey;
if ( $this->fragment !== '' ) {
$name .= '#' . $this->fragment;
}
return $name;
}
}
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