<?php

/*
 * $Id: ContainsRegexpSelector.php 123 2006-09-14 20:19:08Z mrook $
 *
 * 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/types/selectors/BaseExtendSelector.php';
include_once 'phing/types/RegularExpression.php';

/**
 * Selector that filters files based on whether they contain a
 * particular string using regexp.
 * 
 * @author    Hans Lellelid <hans@xmpl.org> (Phing)
 * @author    Bruce Atherton <bruce@callenish.com> (Ant)
 * @version   $Revision: 1.3 $
 * @package   phing.types.selectors
 */
class ContainsRegexpSelector extends BaseExtendSelector {

    /** @var string The expression set from XML. */
    private $userProvidedExpression;
    
    /** @var Regexp */
    private $myExpression;
     
    private $casesensitive = true;
    
    /** @var RegularExpression */
    private $myRegExp;
    
    const EXPRESSION_KEY = "expression";
    
    const CASE_KEY = "casesensitive";
    
    public function toString() {
        $buf = "{containsregexpselector expression: ";
        $buf .= $this->userProvidedExpression;
        $buf .= " casesensitive: ";
        if ($this->casesensitive) {
            $buf .= "true";
        } else {
            $buf .= "false";
        }
        $buf .= "}";
        return $buf;
    }

    /**
     * The expression to match on within a file.
     *
     * @param string $exp the string that a file must contain to be selected.
     */
    public function setExpression($exp) {
        $this->userProvidedExpression = $exp;
    }

    /**
     * Whether to ignore case in the regex match.
     *
     * @param boolean $casesensitive whether to pay attention to case sensitivity
     */
    public function setCasesensitive($casesensitive) {
        $this->casesensitive = $casesensitive;
    }

    /**
     * When using this as a custom selector, this method will be called.
     * It translates each parameter into the appropriate setXXX() call.
     *
     * @param array $parameters the complete set of parameters for this selector
     */
    public function setParameters($parameters) {
        parent::setParameters($parameters);
        if ($parameters !== null) {
            for ($i=0,$size=count($parameters); $i < $size; $i++) {
                $paramname = $parameters[$i]->getName();
                switch(strtolower($paramname)) {
                    case self::EXPRESSION_KEY:
                        $this->setExpression($parameters[$i]->getValue());
                        break;
                    case self::CASE_KEY:
                        $this->setCasesensitive($parameters[$i]->getValue());
                        break;
                    default:
                        $this->setError("Invalid parameter " . $paramname);
                }                
            } // for each param
        } // if params
    }

    /**
     * Checks to make sure all settings are kosher. In this case, it
     * means that the pattern attribute has been set.
     *
     */
    public function verifySettings() {
        if ($this->userProvidedExpression === null) {
            $this->setError("The expression attribute is required");
        }
    }

    /**
     * The heart of the matter. This is where the selector gets to decide
     * on the inclusion of a file in a particular fileset.
     *
     * @param basedir the base directory the scan is being done from
     * @param filename is the name of the file to check
     * @param file a PhingFile object the selector can use
     * @return whether the file should be selected or not
     */
    public function isSelected(PhingFile $basedir, $filename, PhingFile $file) {

        $this->validate();

        if ($file->isDirectory()) {
            return true;
        }
        
        if ($this->myRegExp === null) {
            $this->myRegExp = new RegularExpression();
            $this->myRegExp->setPattern($this->userProvidedExpression);            
            if (!$this->casesensitive) {
                $this->myRegExp->setIgnoreCase(true);
            }
            $this->myExpression = $this->myRegExp->getRegexp($this->getProject());
        }
                        
        $in = null;
        try {
            $in = new BufferedReader(new FileReader($file));        
            $teststr = $in->readLine();
            while ($teststr !== null) {
                if ($this->myExpression->matches($teststr)) {
                    return true;
                }
                $teststr = $in->readLine();
            }
            return false;
        } catch (IOException $ioe) {
            if ($in) $in->close();
            throw new BuildException("Could not read file " . $filename);
        }
        $in->close();                
    }

}

