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<?php /* * $Id: TailFilter.php 325 2007-12-20 15:44:58Z hans $ * * 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'; /** * Reads the last <code>n</code> lines of a stream. (Default is last10 lines.) * * Example: * * <pre><tailfilter lines="3" /></pre> * * Or: * * <pre><filterreader classname="phing.filters.TailFilter"> * <param name="lines" value="3"> * </filterreader></pre> * * @author <a href="mailto:yl@seasonfive.com">Yannick Lecaillez</a> * @author hans lellelid, hans@velum.net * @copyright 2003 seasonfive. All rights reserved * @version $Revision: 1.7 $ * @see BaseParamFilterReader * @package phing.filters */ class TailFilter extends BaseParamFilterReader implements ChainableReader { /** * Parameter name for the number of lines to be returned. * @var string */ const LINES_KEY = "lines"; /** * Number of lines to be returned in the filtered stream. * @var integer */ private $_lines = 10; /** * Array to hold lines. * @var array */ private $_lineBuffer = array(); /** * Returns the last n lines of a file. * @param int $len Num chars to read. * @return mixed The filtered buffer or -1 if EOF. */ function read($len = null) { while ( ($buffer = $this->in->read($len)) !== -1 ) { // Remove the last "\n" from buffer for // prevent explode to add an empty cell at // the end of array $buffer= trim($buffer, "\n"); $lines = explode("\n", $buffer); if ( count($lines) >= $this->_lines ) { // Buffer have more (or same) number of lines than needed. // Fill lineBuffer with the last "$this->_lines" lasts ones. $off = count($lines)-$this->_lines; $this->_lineBuffer = array_slice($lines, $off); } else { // Some new lines ... // Prepare space for insert these new ones $this->_lineBuffer = array_slice($this->_lineBuffer, count($lines)-1); $this->_lineBuffer = array_merge($this->_lineBuffer, $lines); } } if ( empty($this->_lineBuffer) ) $ret = -1; else { $ret = implode("\n", $this->_lineBuffer); $this->_lineBuffer = array(); } return $ret; } /** * Sets the number of lines to be returned in the filtered stream. * * @param integer $lines the number of lines to be returned in the filtered stream. */ function setLines($lines) { $this->_lines = (int) $lines; } /** * Returns the number of lines to be returned in the filtered stream. * * @return integer The number of lines to be returned in the filtered stream. */ function getLines() { return $this->_lines; } /** * Creates a new TailFilter using the passed in * Reader for instantiation. * * @param object A Reader object providing the underlying stream. * Must not be <code>null</code>. * * @return object A new filter based on this configuration, but filtering * the specified reader. */ function chain(Reader $reader) { $newFilter = new TailFilter($reader); $newFilter->setLines($this->getLines()); $newFilter->setInitialized(true); $newFilter->setProject($this->getProject()); return $newFilter; } /** * Scans the parameters list for the "lines" parameter and uses * it to set the number of lines to be returned in the filtered stream. */ private function _initialize() { $params = $this->getParameters(); if ( $params !== null ) { for($i=0, $_i=count($params); $i < $_i; $i++) { if ( self::LINES_KEY == $params[$i]->getName() ) { $this->_lines = (int) $params[$i]->getValue(); break; } } } } }
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