GitElephant\Objects\Diff\DiffObject

Complexity

Total Complexity

38

Size/Duplication

Total Lines	330
Duplicated Lines	0 %

Coupling/Cohesion

Components	3
Dependencies	2

Test Coverage

Coverage

45.45%

Importance

Changes	1
Bugs	0	Features	0

22 Methods

Rating	Name	Duplication	Size	Complexity
A	__toString()	0	4	1
A	getChunks()	0	4	1
A	getDestinationPath()	0	4	1
A	getMode()	0	4	1
A	getOriginalPath()	0	4	1
A	hasPathChanged()	0	4	1
A	offsetExists()	0	4	1
A	offsetGet()	0	4	2
A	offsetUnset()	0	4	1
A	count()	0	4	1
A	current()	0	4	1
A	next()	0	4	1
A	key()	0	4	1
A	valid()	0	4	1
A	rewind()	0	4	1
C	__construct()	0	27	7
A	findPath()	0	8	2
B	findMode()	0	15	5
A	findSimilarityIndex()	0	7	2
A	getSimilarityIndex()	0	8	2
A	offsetSet()	0	8	2
A	findChunks()	0	10	2

<?php
/**
 * GitElephant - An abstraction layer for git written in PHP
 * Copyright (C) 2013  Matteo Giachino
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see [http://www.gnu.org/licenses/].
 */

namespace GitElephant\Objects\Diff;

use \GitElephant\Utilities;

/**
 * Represent a diff for a single object in the repository
 *
 * @author Matteo Giachino <matteog@gmail.com>
 */
class DiffObject implements \ArrayAccess, \Countable, \Iterator
{
    const MODE_INDEX        = 'index';
    const MODE_MODE         = 'mode';
    const MODE_NEW_FILE     = 'new_file';
    const MODE_DELETED_FILE = 'deleted_file';
    const MODE_RENAMED      = 'renamed_file';

    /**
     * the cursor position
     *
     * @var int
     */
    private $position;

    /**
     * the original file path for the diff object
     *
     * @var string
     */
    private $originalPath;

    /**
     * the destination path for the diff object
     *
     * @var string
     */
    private $destinationPath;

    /**
     * rename similarity index
     *
     * @var int
     */
    private $similarityIndex;

    /**
     * the diff mode
     *
     * @var string
     */
    private $mode;

    /**
     * the diff chunks
     *
     * @var array
     */
    private $chunks;

    /**
     * Class constructor
     *
     * @param array $lines output lines for the diff
     *
     * @throws \InvalidArgumentException
     */
    public function __construct($lines)
    {
        $this->position = 0;
        $this->chunks   = array();

        $this->findPath($lines[0]);

        $sliceIndex = 4;
        if ($this->hasPathChanged()) {
            $this->findSimilarityIndex($lines[1]);
            if (isset($lines[4]) && !empty($lines[4])) {
                $this->findMode($lines[4]);
                $sliceIndex = 7;
            } else {
                $this->mode = self::MODE_RENAMED;
            }
        } else {
            $this->findMode($lines[1]);
        }

        if ($this->mode == self::MODE_INDEX || $this->mode == self::MODE_NEW_FILE) {
            $lines = array_slice($lines, $sliceIndex);
            if (!empty($lines)) {
                $this->findChunks($lines);
            }
        }
    }

    /**
     * toString magic method
     *
     * @return mixed
     */
    public function __toString()
    {
        return $this->originalPath;
    }

    /**
     * Find the diff chunks
     *
     * @param array $lines output lines for the diff
     * @throws \InvalidArgumentException
     */
    private function findChunks($lines)
    {
        $arrayChunks = Utilities::pregSplitArray(
            $lines,
            '/^@@ -(\d+,\d+)|(\d+) \+(\d+,\d+)|(\d+) @@(.*)$/'
        );
        foreach ($arrayChunks as $chunkLines) {
            $this->chunks[] = new DiffChunk($chunkLines);
        }
    }

    /**
     * look for the path in the line
     *
     * @param string $line line content
     */
    private function findPath($line)
    {
        $matches = array();
        if (preg_match('/^diff --git SRC\/(.*) DST\/(.*)$/', $line, $matches)) {
            $this->originalPath    = $matches[1];
            $this->destinationPath = $matches[2];
        }
    }

    /**
     * find the line mode
     *
     * @param string $line line content
     */
    private function findMode($line)
    {
        if (preg_match('/^index (.*)\.\.(.*) (.*)$/', $line)) {
            $this->mode = self::MODE_INDEX;
        }
        if (preg_match('/^mode (.*)\.\.(.*) (.*)$/', $line)) {
            $this->mode = self::MODE_MODE;
        }
        if (preg_match('/^new file mode (.*)/', $line)) {
            $this->mode = self::MODE_NEW_FILE;
        }
        if (preg_match('/^deleted file mode (.*)/', $line)) {
            $this->mode = self::MODE_DELETED_FILE;
        }
    }

    /**
     * look for similarity index in the line
     *
     * @param string $line line content
     */
    private function findSimilarityIndex($line)
    {
        $matches = array();
        if (preg_match('/^similarity index (.*)\%$/', $line, $matches)) {
            $this->similarityIndex = $matches[1];

The property $similarityIndex was declared of type integer, but $matches[1] is of type string. Maybe add a type cast?

        }
    }

    /**
     * chunks getter
     *
     * @return array
     */
    public function getChunks()
    {
        return $this->chunks;
    }

    /**
     * destinationPath getter
     *
     * @return string
     */
    public function getDestinationPath()
    {
        return $this->destinationPath;
    }

    /**
     * mode getter
     *
     * @return string
     */
    public function getMode()
    {
        return $this->mode;
    }

    /**
     * originalPath getter
     *
     * @return string
     */
    public function getOriginalPath()
    {
        return $this->originalPath;
    }

    /**
     * Check if path has changed (file was renamed)
     *
     * @return bool
     */
    public function hasPathChanged()
    {
        return ($this->originalPath !== $this->destinationPath);
    }

    /**
     * Get similarity index
     *
     * @return int
     * @throws \RuntimeException if not a rename
     */
    public function getSimilarityIndex()
    {
        if ($this->hasPathChanged()) {
            return $this->similarityIndex;
        }

        throw new \RuntimeException('Cannot get similarity index on non-renames');
    }

    /**
     * ArrayAccess interface
     *
     * @param int $offset offset
     *
     * @return bool
     */
    public function offsetExists($offset)
    {
        return isset($this->chunks[$offset]);
    }

    /**
     * ArrayAccess interface
     *
     * @param int $offset offset
     *
     * @return null
     */
    public function offsetGet($offset)
    {
        return isset($this->chunks[$offset]) ? $this->chunks[$offset] : null;
    }

    /**
     * ArrayAccess interface
     *
     * @param int   $offset offset
     * @param mixed $value  value
     */
    public function offsetSet($offset, $value)
    {
        if (is_null($offset)) {
            $this->chunks[] = $value;
        } else {
            $this->chunks[$offset] = $value;
        }
    }

    /**
     * ArrayAccess interface
     *
     * @param int $offset offset
     */
    public function offsetUnset($offset)
    {
        unset($this->chunks[$offset]);
    }

    /**
     * Countable interface
     *
     * @return int
     */
    public function count()
    {
        return count($this->chunks);
    }

    /**
     * Iterator interface
     *
     * @return mixed
     */
    public function current()
    {
        return $this->chunks[$this->position];
    }

    /**
     * Iterator interface
     */
    public function next()
    {
        ++$this->position;
    }

    /**
     * Iterator interface
     *
     * @return int
     */
    public function key()
    {
        return $this->position;
    }

    /**
     * Iterator interface
     *
     * @return bool
     */
    public function valid()
    {
        return isset($this->chunks[$this->position]);
    }

    /**
     * Iterator interface
     */
    public function rewind()
    {
        $this->position = 0;
    }
}