Don't emit errors if positions are not tracked

lib/Data.php

@@ -45,6 +45,7 @@ class Data {
         $this->errorHandler = $errorHandler ?? new ParseError;
         $this->filePath = $filePath;
         $encodingOrContentType = (string) $encodingOrContentType;
+        // don't track the current line/column position if erroro reporting has been suppressed
         if (!(error_reporting() & \E_USER_WARNING)) {
             $this->track = false;
         }
@@ -223,6 +224,7 @@ class Data {
 
     /** Returns an indexed array with the line and column positions of the requested offset from the current position */
     public function whereIs(int $relativePos): array {
+        if ($this->track) {
             if ($this->eof) {
                 $relativePos++;
                 if ($this->astrals[$this->data->posChar()] ?? false) {
@@ -263,6 +265,9 @@ class Data {
             } else {
                 return [$this->_line, $this->_column + $relativePos];
             }
+        } else {
+            return [0, 0];
+        }
     }
 
     public function __get($property) {

lib/ParseErrorDummy.php

@@ -0,0 +1,17 @@
+<?php
+declare(strict_types=1);
+namespace dW\HTML5;
+
+class ParseErrorDummy extends ParseError {
+    public function setHandler() {
+        // Do nothing
+    }
+
+    public function clearHandler() {
+        // Do nothing
+    }
+
+    public function emit(string $file, int $line, int $column, int $code, ...$arg): bool {
+        return false;
+    }
+}

lib/Parser.php

@@ -25,7 +25,11 @@ class Parser {
     public static function parse(string $data, ?Document $document = null, ?string $encodingOrContentType = null, ?\DOMElement $fragmentContext = null, ?String $file = null): Document {
         // Initialize the various classes needed for parsing
         $document = $document ?? new Document;
+        if ((error_reporting() & \E_USER_WARNING)) {
             $errorHandler = new ParseError;
+        } else {
+            $errorHandler = new ParseErrorDummy;
+        }        
         $decoder = new Data($data, $file ?? "STDIN", $errorHandler, $encodingOrContentType);
         $document->documentEncoding = $decoder->encoding;
         $stack = new OpenElementsStack($fragmentContext);