for testing and deploying your application
for finding and fixing issues
for empowering human code reviews
<?php
namespace donatj\Printf;
class StringLexer {
private int $pos = 0;
private string $string;
/**
* StringScanner constructor.
*/
public function __construct( string $string ) {
$this->string = $string;
}
public function peek( int $size = 1 ) : CharData {
$str = substr($this->string, $this->pos, $size);
return new CharData($str, strlen($str) < $size);
public function pos() : int {
return $this->pos;
public function next() : CharData {
$data = $this->peek();
$this->pos += $data->length();
return $data;
public function rewind() : void {
$this->pos--;
if( $this->pos < 0 ) {
//@todo custom exception
throw new \RuntimeException('cannot rewind');
public function hasPrefix( string $prefix ) : bool {
$peek = $this->peek(strlen($prefix));
return $peek->getString() === $prefix;
public function substr( int $start, int $length ) : string {
return substr($this->string, $start, $length);
donatj /
printf-parser
