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Diffstat (limited to 'buildscripts/phing/classes/phing/filters/HeadFilter.php')
| -rwxr-xr-x | buildscripts/phing/classes/phing/filters/HeadFilter.php | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/buildscripts/phing/classes/phing/filters/HeadFilter.php b/buildscripts/phing/classes/phing/filters/HeadFilter.php new file mode 100755 index 00000000..3cbcb51b --- /dev/null +++ b/buildscripts/phing/classes/phing/filters/HeadFilter.php @@ -0,0 +1,161 @@ +<?php + +/* + * $Id: e3e9c0a171b4416545e57fe42b45b4eec14914ce $ + * + * 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>. +*/ + +include_once 'phing/filters/BaseParamFilterReader.php'; +include_once 'phing/filters/ChainableReader.php'; + +/** + * Reads the first <code>n</code> lines of a stream. + * (Default is first 10 lines.) + * <p> + * Example: + * <pre><headfilter lines="3"/></pre> + * Or: + * <pre><filterreader classname="phing.filters.HeadFilter"> + * <param name="lines" value="3"/> + * </filterreader></pre> + * + * @author <a href="mailto:yl@seasonfive.com">Yannick Lecaillez</a> + * @author hans lellelid, hans@velum.net + * @version $Id$ + * @access public + * @see FilterReader + * @package phing.filters + */ +class HeadFilter extends BaseParamFilterReader implements ChainableReader { + + /** + * Parameter name for the number of lines to be returned. + */ + const LINES_KEY = "lines"; + + /** + * Number of lines currently read in. + * @var integer + */ + private $_linesRead = 0; + + /** + * Number of lines to be returned in the filtered stream. + * @var integer + */ + private $_lines = 10; + + /** + * Returns first n lines of stream. + * @return the resulting stream, or -1 + * if the end of the resulting stream has been reached + * + * @exception IOException if the underlying stream throws an IOException + * during reading + */ + function read($len = null) { + + if ( !$this->getInitialized() ) { + $this->_initialize(); + $this->setInitialized(true); + } + + // note, if buffer contains fewer lines than + // $this->_lines this code will not work. + + if($this->_linesRead < $this->_lines) { + + $buffer = $this->in->read($len); + + if($buffer === -1) { + return -1; + } + + // now grab first X lines from buffer + + $lines = explode("\n", $buffer); + + $linesCount = count($lines); + + // must account for possibility that the num lines requested could + // involve more than one buffer read. + $len = ($linesCount > $this->_lines ? $this->_lines - $this->_linesRead : $linesCount); + $filtered_buffer = implode("\n", array_slice($lines, 0, $len) ); + $this->_linesRead += $len; + + return $filtered_buffer; + + } + + return -1; // EOF, since the file is "finished" as far as subsequent filters are concerned. + } + + /** + * 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 HeadFilter 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) { + $newFilter = new HeadFilter($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; + } + } + } + } +} + + |