<?php
/*
 *  $Id: PhpLintTask.php 960 2010-10-30 09:51:09Z 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/Task.php';
require_once 'phing/util/DataStore.php';
require_once 'phing/system/io/FileWriter.php';

/**
 * A PHP lint task. Checking syntax of one or more PHP source file.
 *
 * @author   Knut Urdalen <knut.urdalen@telio.no>
 * @author   Stefan Priebsch <stefan.priebsch@e-novative.de>
 * @version  $Id: PhpLintTask.php 960 2010-10-30 09:51:09Z mrook $
 * @package  phing.tasks.ext
 */
class PhpLintTask extends Task {

    protected $file;    // the source file (from xml attribute)
    protected $filesets = array(); // all fileset objects assigned to this task

    protected $errorProperty;
    protected $haltOnFailure = false;
    protected $hasErrors = false;
    protected $badFiles = array();
    protected $interpreter = ''; // php interpreter to use for linting
    
    protected $logLevel = Project::MSG_INFO;
    
    protected $cache = null;
    
    protected $tofile = null;
    
    protected $deprecatedAsError = false;

    /**
     * Initialize the interpreter with the Phing property
     */
    public function __construct() {
        $this->setInterpreter(Phing::getProperty('php.interpreter'));
    }

    /**
     * Override default php interpreter
     * @todo    Do some sort of checking if the path is correct but would 
     *          require traversing the systems executeable path too
     * @param   string  $sPhp
     */
    public function setInterpreter($sPhp) {
        $this->Interpreter = $sPhp;
    }

    /**
     * The haltonfailure property
     * @param boolean $aValue
     */
    public function setHaltOnFailure($aValue) {
        $this->haltOnFailure = $aValue;
    }

    /**
     * File to be performed syntax check on
     * @param PhingFile $file
     */
    public function setFile(PhingFile $file) {
        $this->file = $file;
    }

    /**
     * Set an property name in which to put any errors.
     * @param string $propname 
     */
    public function setErrorproperty($propname)
    {
        $this->errorProperty = $propname;
    }
    
    /**
     * Whether to store last-modified times in cache
     *
     * @param PhingFile $file
     */
    public function setCacheFile(PhingFile $file)
    {
        $this->cache = new DataStore($file);
    }

    /**
     * Whether to store last-modified times in cache
     *
     * @param PhingFile $file
     */
    public function setToFile(PhingFile $tofile)
    {
        $this->tofile = $tofile;
    }

    /**
     * Nested creator, creates a FileSet for this task
     *
     * @return FileSet The created fileset object
     */
    public function createFileSet() {
        $num = array_push($this->filesets, new FileSet());
        return $this->filesets[$num-1];
    }
    
    /**
     * Set level of log messages generated (default = info)
     * @param string $level
     */
    public function setLevel($level)
    {
        switch ($level)
        {
            case "error": $this->logLevel = Project::MSG_ERR; break;
            case "warning": $this->logLevel = Project::MSG_WARN; break;
            case "info": $this->logLevel = Project::MSG_INFO; break;
            case "verbose": $this->logLevel = Project::MSG_VERBOSE; break;
            case "debug": $this->logLevel = Project::MSG_DEBUG; break;
        }
    }
    
    /**
     * Sets whether to treat deprecated warnings (introduced in PHP 5.3) as errors
     * @param boolean $deprecatedAsError
     */
    public function setDeprecatedAsError($deprecatedAsError)
    {
        $this->deprecatedAsError = $deprecatedAsError;
    }

    /**
     * Execute lint check against PhingFile or a FileSet
     */
    public function main() {
        if(!isset($this->file) and count($this->filesets) == 0) {
            throw new BuildException("Missing either a nested fileset or attribute 'file' set");
        }

        if($this->file instanceof PhingFile) {
            $this->lint($this->file->getPath());
        } else { // process filesets
            $project = $this->getProject();
            foreach($this->filesets as $fs) {
                $ds = $fs->getDirectoryScanner($project);
                $files = $ds->getIncludedFiles();
                $dir = $fs->getDir($this->project)->getPath();
                foreach($files as $file) {
                    $this->lint($dir.DIRECTORY_SEPARATOR.$file);
                }
            }
        }
                
        // write list of 'bad files' to file (if specified)
        if ($this->tofile) {
            $writer = new FileWriter($this->tofile);
            
            foreach ($this->badFiles as $file => $msg) {
                $writer->write($file . "=" . $msg . PHP_EOL);
            }
            
            $writer->close();
        }

        if ($this->haltOnFailure && $this->hasErrors) throw new BuildException('Syntax error(s) in PHP files: '.implode(', ',$this->badFiles));
    }

    /**
     * Performs the actual syntax check
     *
     * @param string $file
     * @return void
     */
    protected function lint($file) {
        $command = $this->Interpreter == ''
            ? 'php'
            : $this->Interpreter;
        $command .= ' -l ';
        if(file_exists($file)) {
            if(is_readable($file)) {
                if ($this->cache)
                {
                    $lastmtime = $this->cache->get($file);
                    
                    if ($lastmtime >= filemtime($file))
                    {
                        $this->log("Not linting '" . $file . "' due to cache", Project::MSG_DEBUG);
                        return false;
                    }
                }
                
                $messages = array();
                $errorCount = 0;
                $returnCode = 0;

                exec($command.'"'.$file.'" 2>&1', $messages, $returnCode);

                if ($returnCode) {
                    $this->log("Could not parse file", Project::MSG_ERR);
                } else {
                    for ($i = 0; $i < count($messages) - 1; $i++) {
                        $message = $messages[$i];
                        if (trim($message) == '') {
                            continue;
                        }
                        
                        if ((!preg_match('/^(.*)Deprecated:/', $message) || $this->deprecatedAsError) && !preg_match('/^No syntax errors detected/', $message)) {
                            $this->log($message, $this->logLevel);
                                
                            if ($this->errorProperty) {
                                $this->project->setProperty($this->errorProperty, $message);
                            }
                            
                            if (!isset($this->badFiles[$file])) {
                                $this->badFiles[$file] = $message;
                            }
                    
                            $this->hasErrors = true;
                            $errorCount++;
                        }
                    }
                }

                if (!$errorCount) {
                    $this->log($file.': No syntax errors detected', $this->logLevel);
                    
                    if ($this->cache)
                    {
                        $this->cache->put($file, filemtime($file));
                    }
                }
            } else {
                throw new BuildException('Permission denied: '.$file);
            }
        } else {
            throw new BuildException('File not found: '.$file);
        }
    }
}



