From c47c72d2216eec102ae2f8693ce6505c61f1c08e Mon Sep 17 00:00:00 2001
From: Michiel Stornebrink <michielstornebrink@gmail.com>
Date: Sat, 18 Jan 2025 10:09:35 +0100
Subject: [PATCH] Issue/58 bugfix turtle bool parser (#59)

* Bugfix parsing boolean values in Turtle: Case where boolean value is directly followed by other char without whitespace. Fixes #58

---------

Co-authored-by: Konrad Abicht <hi@inspirito.de>
---
 lib/Parser/Turtle.php                              |  3 +++
 test/fixtures/turtle/gh58-sweetrdf-bool-parser.ttl | 11 +++++++++++
 tests/EasyRdf/Parser/TurtleTest.php                | 13 +++++++++++++
 3 files changed, 27 insertions(+)
 create mode 100644 test/fixtures/turtle/gh58-sweetrdf-bool-parser.ttl

diff --git a/lib/Parser/Turtle.php b/lib/Parser/Turtle.php
index f9785bde..1368d396 100644
--- a/lib/Parser/Turtle.php
+++ b/lib/Parser/Turtle.php
@@ -906,6 +906,9 @@ protected function parseQNameOrBoolean()
                 $value = $prefix;
 
                 if ('true' == $value || 'false' == $value) {
+                    // Unread last character
+                    $this->unread($c);
+
                     return [
                         'type' => 'literal',
                         'value' => $value,
diff --git a/test/fixtures/turtle/gh58-sweetrdf-bool-parser.ttl b/test/fixtures/turtle/gh58-sweetrdf-bool-parser.ttl
new file mode 100644
index 00000000..76a5099a
--- /dev/null
+++ b/test/fixtures/turtle/gh58-sweetrdf-bool-parser.ttl
@@ -0,0 +1,11 @@
+@prefix : <http://example.org/#> .
+
+# Allow reserved chars directly after boolean values (no whitespace)
+# See https://github.com/sweetrdf/easyrdf/issues/58
+:foo :bar true.
+
+:foo :bar false;
+  :bar :baz ;
+.
+
+:foo :bar true,false.
diff --git a/tests/EasyRdf/Parser/TurtleTest.php b/tests/EasyRdf/Parser/TurtleTest.php
index b0a880b1..ffbcf7c1 100644
--- a/tests/EasyRdf/Parser/TurtleTest.php
+++ b/tests/EasyRdf/Parser/TurtleTest.php
@@ -608,4 +608,17 @@ public function testIssue52()
     {
         $this->turtleTestCase('gh52-sweetrdf-whitespace-langtag');
     }
+
+    /**
+     * Bug in Turtle parser for boolean value that is directly followed by a semicolon
+     *
+     * @see https://github.com/sweetrdf/easyrdf/issues/58
+     */
+    public function testIssue58()
+    {
+        // Test file should parse without exceptions
+        $this->expectNotToPerformAssertions();
+
+        $this->parseTurtle('turtle/gh58-sweetrdf-bool-parser.ttl');
+    }
 }