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<?php
/*
* $Id: TabToSpaces.php,v 1.9 2004/03/15 14:45:06 hlellelid Exp $
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This software consists of voluntary contributions made by many individuals
* and is licensed under the LGPL. For more information please see
* <http://phing.info>.
*/
require_once 'phing/filters/BaseParamFilterReader.php';
require_once 'phing/filters/ChainableReader.php';
/**
* Converts tabs to spaces.
*
* Example:
*
* <pre><tabtospaces tablength="8"></pre>
*
* Or:
*
* <pre><filterreader classname="phing.filters.TabsToSpaces">
* <param name="tablength" value="8">
* </filterreader></pre>
*
* @author Yannick Lecaillez <yl@seasonfive.com>
* @author Hans Lellelid <hans@xmpl.org>
* @version $Revision: 1.9 $
* @see BaseParamFilterReader
* @package phing.filters
*/
class TabToSpaces extends BaseParamFilterReader implements ChainableReader {
/**
* The default tab length.
* @var int
*/
const DEFAULT_TAB_LENGTH = 8;
/**
* Parameter name for the length of a tab.
* @var string
*/
const TAB_LENGTH_KEY = "tablength";
/**
* Tab length in this filter.
* @var int
*/
private $tabLength = 8; //self::DEFAULT_TAB_LENGTH;
/**
* Returns stream after converting tabs to the specified number of spaces.
*
* @return the resulting stream, or -1
* if the end of the resulting stream has been reached
*
* @exception IOException if the underlying stream throws an IOException
* during reading
*/
function read($len = null) {
if ( !$this->getInitialized() ) {
$this->_initialize();
$this->setInitialized(true);
}
$buffer = $this->in->read($len);
if($buffer === -1) {
return -1;
}
$buffer = str_replace("\t", str_repeat(' ', $this->tabLength), $buffer);
return $buffer;
}
/**
* Sets the tab length.
*
* @param int $tabLength The number of spaces to be used when converting a tab.
*/
function setTablength($tabLength) {
$this->tabLength = (int) $tabLength;
}
/**
* Returns the tab length.
*
* @return int The number of spaces used when converting a tab
*/
function getTablength() {
return $this->tabLength;
}
/**
* Creates a new TabsToSpaces using the passed in
* Reader for instantiation.
*
* @param Reader $reader A Reader object providing the underlying stream.
* Must not be <code>null</code>.
*
* @return Reader A new filter based on this configuration, but filtering
* the specified reader
*/
function chain(Reader $reader) {
$newFilter = new TabToSpaces($reader);
$newFilter->setTablength($this->getTablength());
$newFilter->setInitialized(true);
$newFilter->setProject($this->getProject());
return $newFilter;
}
/**
* Parses the parameters to set the tab length.
*/
private function _initialize() {
$params = $this->getParameters();
if ( $params !== null ) {
for($i = 0 ; $i<count($params) ; $i++) {
if (self::TAB_LENGTH_KEY === $params[$i]->getName()) {
$this->tabLength = $params[$i]->getValue();
break;
}
}
}
}
}
?>
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