Add parse error details to __toString method output

Author: theseer

src/document/ParsingException.php

@@ -10,6 +10,8 @@
 namespace Templado\Engine;
 
 use LibXMLError;
+use function sprintf;
+use function trim;
 
 final class ParsingException extends DocumentException {
     /** @psalm-param list<LibXMLError> */
@@ -23,4 +25,21 @@ public function __construct(LibXMLError ...$errors) {
     public function errors(): array {
         return $this->errors;
     }
+
+    public function __toString(): string {
+        $msg = $this->getMessage() . "\n";
+
+        foreach($this->errors as $error) {
+            $msg .= sprintf(
+                "[line: %d / column: %d] %s\n",
+                $error->line,
+                $error->column,
+                $error->message
+            );
+        }
+
+        $msg .= $this->getTraceAsString();
+
+        return $msg;
+    }
 }

tests/document/ParsingExceptionTest.php

@@ -14,4 +14,21 @@ public function testLibXMLErrorsCanBeRetrieved(): void {
         $this->assertCount(1, $exception->errors());
         $this->assertEquals('Error(s) during parse', $exception->getMessage());
     }
+
+    public function testToStringAlsoReturnsLibXMLErrorsAsString(): void {
+        \libxml_use_internal_errors(true);
+        (new \DOMDocument())->loadXML('<?xml version="1.0" ?><parseerror>');
+        $exception = new ParsingException(...libxml_get_errors());
+        $exceptionString = (string)$exception;
+
+        $this->assertStringContainsString(
+            $exception->getMessage() . "\n",
+            $exceptionString
+        );
+
+        $this->assertStringContainsString(
+            '[line: 1 / column: 35] Premature end of data in tag parseerror line 1',
+            $exceptionString
+        );
+    }
 }