classParser.php

<?php
/**
 * Given a string of PHP code, this will provide a list of classes, their 
 * constructors and the line number they're on. Used for programmatically 
 * updating older code using PHP4 style constructors to PHP7
 */
class classParser{
	
	private $code;
	private $tokens = array();
	
	public function __construct($code){
		$this->code = $code;
		$this->getTokens();
	}
	
	public function getClasses(){
		$classes = array();
		foreach($this->tokens as $ti=>$token){
			if(!is_array($token)) continue;
			if($token['token'] === "T_CLASS"){
				$className = $this->getClassName($ti);
				$const = $this->getConstructor($ti, $className);
				$classes[] = array(
					"name" => $className,
					"constructor" => $const['name'],
					"constructorLine" => $const['line'],
					"signature_def" => $this->getConstructorSignatureWithVars($const['name'], $const['line']),
					"signature_use" => $this->getConstructorSignature($const['name'], $const['line'])
				);
			}
		}
		return $classes;
	}
	
	private function getConstructorSignature($name, $line){
		$fullConstr = $this->getConstructorSignatureWithVars($name, $line);
		$cParts = explode(",", trim($fullConstr, " ()"));
		$varNames = array();
		foreach($cParts as $part){
			$var = explode("=", $part);
			$varname = trim($var[0]);
			if(substr($varname, 0, 1) !== "$") continue;
			$varNames[] = trim($var[0]);
		}
		return "(".implode(", ", $varNames).")";
	}
	
	private function getConstructorSignatureWithVars($name, $line){
		$lines = explode("\n", $this->code);
		$startpos = strpos($lines[$line-1], $name) + strlen($name);
		$endpos = strpos($lines[$line-1], ")")+1;
		return substr($lines[$line-1], $startpos, $endpos-$startpos);
	}
	
	private function getTokens(){
		$tokens = token_get_all($this->code);
		foreach($tokens as $k=>$v){
			if(is_array($v)){
				$this->tokens[] = array(
					"token" => token_name($v[0]),
					"string" => $v[1],
					"line" => $v[2]
				);
			}else $this->tokens[] = $v;
		}
	}
	
	private function getConstructor($tokenIndex, $classname){
		for($i=$tokenIndex+2; $i<count($this->tokens); $i++){
			if(!is_array($this->tokens[$i])) continue;
			if($this->tokens[$i]['token'] === "T_CLASS") return false;
			if(!is_array($this->tokens[$i])) continue;
			if($this->tokens[$i]['token'] !== "T_FUNCTION") continue;
			$constructorName = $this->getFunctName($i);
			if(strtolower($constructorName) === strtolower($classname)) 
				return array('name'=>$constructorName, 'line'=>$this->tokens[$i]['line']);
			if(strtolower($constructorName) === "__construct") 
				return array('name'=>$constructorName, 'line'=>$this->tokens[$i]['line']);
		}
		return false;
	}
	
	private function getFunctName($tokenIndex){
		if(empty($this->tokens[$tokenIndex])) return false;
		if($this->tokens[$tokenIndex]['token'] !== "T_FUNCTION") return false;
		if($this->tokens[$tokenIndex+1]['token'] !== "T_WHITESPACE") return false;
		if($this->tokens[$tokenIndex+2]['token'] !== "T_STRING") return false;
		return $this->tokens[$tokenIndex+2]['string'];
	}
	
	private function getClassName($tokenIndex){
		if(empty($this->tokens[$tokenIndex])) return false;
		if($this->tokens[$tokenIndex]['token'] !== "T_CLASS") return false;
		if($this->tokens[$tokenIndex+1]['token'] !== "T_WHITESPACE") return false;
		if($this->tokens[$tokenIndex+2]['token'] !== "T_STRING") return false;
		return $this->tokens[$tokenIndex+2]['string'];
	}
	
}