YAML storage class providing simple inser/modify/delete operations.

yamlStorage.class.php

<?php
/*
# Author: Tad DeVries
# Email: taddevries@gmail.com
# FileName: yamlStorage.class.php
#
# Description:
# This class provides a simple mechanism for inserting/modifying/deleting
# information in a YAML file. 
#
#
# Copyright (C) 2012 Tad DeVries
#
# 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 2
# of the License, or 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#
# License Info: http://www.gnu.org/licenses/gpl-2.0.html
#
#
*/
class yamlStorage {
	private $yamlFile = "";
	private $yamlArray = "";

	//
	// Class Constructor
	//
	public function __construct( $file ) {
		$this->yamlFile = $file;
		
		if( file_exists( $this->yamlFile ) ) {
			echo "File found: {$this->yamlFile}<br/>\n";
			$this->readFile();
		}
		else {
			touch( $this->yamlFile );
			echo "File created: {$this->yamlFile}\n";
		}
	}
	
	//
	// Class Destructor
	//
	public function __destruct() {
		//destructor operations
	}
	
	//
	//  Read Function
	//
	private function readFile() {
		$this->yamlArray = yaml_parse_file( $this->yamlFile );
	}
	
	//
	//  Write Function
	//
	private function writeFile() {
		//the yaml_emit_file function is not fully implemented yet
		//as of 5.4 it still produces an error when called
		//yaml_emit_file( $this->yamlFile, $data ); 
		$yamlData = yaml_emit ( $this->yamlArray );
		$fp = fopen ( $this->yamlFile, 'w' );
		fwrite ( $fp, $yamlData );
		fclose ( $fp );
	}
	
	//
	//  Data Parsing Function
	//  Input Expected: (String) "key[.key.key[:value]]"
	//
	private function parseData($data) {
		$parsedString = explode(":", $data);
		if(isset($parsedString[1]))
			$value = $parsedString[1];
		else
			$value = "";
		
		$parsedKeys = explode(".", $parsedString[0]);
		
		$keysCount = count($parsedKeys);
		$dataArray = array( $parsedKeys[$keysCount-1] => $value);
		
		for($i=$keysCount-2; $i>=0; $i--) {
			$dataArray = array($parsedKeys[$i] => $dataArray);
		}
		return $dataArray;
	}
	
	//
	//  Multidimensional Array Diff
	//
	private function check_diff_multi($array1, $array2) {
		$result = array();
		foreach($array1 as $key => $val) {
			if(isset($array2[$key])){
				if(is_array($val) && is_array($array2[$key])) {
					$result[$key] = $this->check_diff_multi($val, $array2[$key]);
				}
			} else {
			$result[$key] = $val;
			}
		}
		return $result;
	}
	
	//
	//  Insert Function
	//
	public function insert($data) {
		$dataArray = $this->parseData($data);
		if(array_key_exists(key($dataArray), $this->yamlArray)) {
			echo "Key Already exists<br/>\n";
		}
		else {
			$this->yamlArray = $this->yamlArray + $dataArray;
			$this->writeFile();
		}
	}
	
	//
	//  Modify Function
	//
	public function modify($data) {
		$dataArray = $this->parseData($data);
		if(array_key_exists(key($dataArray), $this->yamlArray)) {
			$this->yamlArray = array_replace_recursive($this->yamlArray, $dataArray);
			$this->writeFile();
		}
		else {
			echo "Key Not Found<br/>\n";
		}
	}
	
	//
	//  Delete Function
	//
	public function delete($data) {
		$dataArray = $this->parseData($data);
		$this->yamlArray = $this->check_diff_multi($this->yamlArray, $dataArray);
		$this->writeFile();
	}
	
	//
	//  Get Function
	//  Not fully implemented yet
	//
	public function get($data) {
		//$dataArray = $this->parseData($data);
		//$temp = $this->check_diff_multi($dataArray, $this->yamlArray);
		//print_r($temp);
	}
	
	//
	//  Display Function
	//
	public function display() {
		echo "<code>\n";
		print_r( $this->yamlArray );
		echo "</code><br/>\n";
	}
}