php-vdf-parser/vdfparser.php at master · XAOPT/php-vdf-parser · GitHub

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<?php

/*

	* VDF (Valve Data Format) file parser
	* author: devinwl
	* version: 1.03

*/

define("QUOTE", "\"");
define("CURLY_BRACE_BEGIN", "{");
define("CURLY_BRACE_END", "}");
define("NEW_LINE", "\n");
define("C_RETURN", "\r");
define("C_TAB", "\t");
define("C_ESCAPE", "\\");

function VDFParse($filename) {
	$parsed = array();
	$ptr = &$parsed;
	$path = '';				// The current level represented as a string
	$p = 0;					// How many quotes have been seen
	$string = "";			// The string of consumed characters
	$key = "";				// The discovered key
	$value = "";			// The discovered corresponding value
	$reading = false;		// Currently consuming characters
	$lastCharSeen = "";		// Tracks the last character seen

	$filecontent = file_get_contents($filename);

	// Strip all comments before parsing
	$filecontent = str_replace('!//.*!', '', $filecontent);

	// Begin parsing by character
	$chunks = str_split($filecontent, 2048);
	unset($filecontent);

	foreach ($chunks as &$chunk) {

		$chars = str_split($chunk, 1);

		foreach($chars as $c) {

			// Dont consume any escapes or quotes (unless the last seen character is escaping them)
			if($reading) {
				if($lastCharSeen == C_ESCAPE) {
					$string .= C_ESCAPE . $c;
				}
				else if($c != C_ESCAPE && $c != QUOTE)
					$string .= $c;
			}

			// If both the key and value have been discovered store them and reset
			if(strlen($key) > 0 && strlen($value) > 0) {
				$ptr[$key] = $value;
				$key = '';
				$value = '';
				$p = 0;
			}

			// Handle the character
			switch($c) {
				case QUOTE:
				if($lastCharSeen != C_ESCAPE) {
					$comment_chars_seen = 0;
					$p++;	// Quote counter
					if($p == 5) $p = 1;
					if($reading) {
						// End parsing string
						$reading = false;

						switch($p) {
							case 2: // Key
								$key = $string;
								$string = '';
							break;
							case 4: // Value
								$value = $string;
								$string = '';
							break;
						}
					}
					else {
						$reading = true;
					}
				}

				break;

				case CURLY_BRACE_BEGIN:
					$comment_chars_seen = 0;
					if(!(strlen($key)>0)) die("Not properly formed key-value structure" . print_r($parsed));

					$ptr[$key] = array();
					$ptr = &$ptr[$key];

					// Keep track of depth via a string path
					if($path == '')
						$path .= $key;
					else
						$path .= '.' . $key;

					// Reset for new level
					$string = '';
					$key = '';
					$value = '';
					$p = 0;

				break;

				case CURLY_BRACE_END:
					$ptr = &$parsed;
					$full_path = explode(".", $path);
					$new_path = '';
					if(count($full_path) > 0) {
						$i = 0;
						for($i = 0; $i < count($full_path)-1; $i++) {
							if($new_path == '')
								$new_path .= $full_path[$i];
							else
								$new_path .= '.' . $full_path[$i];
							$ptr = &$ptr[$full_path[$i]];
						}
					}

					$path = $new_path;

				break;

				default:
					$comment_chars_seen = 0;

			}

			$lastCharSeen = $c;
		}
	}

	return $parsed;

}

?>