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Diffstat (limited to 'buildscripts/phing/classes/phing/filters/TailFilter.php')
| -rwxr-xr-x | buildscripts/phing/classes/phing/filters/TailFilter.php | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/buildscripts/phing/classes/phing/filters/TailFilter.php b/buildscripts/phing/classes/phing/filters/TailFilter.php new file mode 100755 index 00000000..95a9c6f5 --- /dev/null +++ b/buildscripts/phing/classes/phing/filters/TailFilter.php @@ -0,0 +1,157 @@ +<?php + +/* + * $Id: 3c108d45a4b3be6f6b9a395477e7641d8e17c44b $ + * + * 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 $Id$ + * @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; + } + } + } + } +} + + |