From 21a44ed825249a9646004958e4f80c07e639c444 Mon Sep 17 00:00:00 2001
From: Konstantin Safonov <kasthack@epicm.org>
Date: Wed, 31 Jul 2019 01:01:53 +0300
Subject: [PATCH] Allow to suppress '<' validation for attribute values

---
 .../Tokenizer/XmlTokenization.cs              | 27 +++++++++++++++++++
 src/AngleSharp.Xml/Parser/XmlTokenizer.cs     |  2 +-
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/src/AngleSharp.Xml.Tests/Tokenizer/XmlTokenization.cs b/src/AngleSharp.Xml.Tests/Tokenizer/XmlTokenization.cs
index 53ac3c9..54ca1ed 100644
--- a/src/AngleSharp.Xml.Tests/Tokenizer/XmlTokenization.cs
+++ b/src/AngleSharp.Xml.Tests/Tokenizer/XmlTokenization.cs
@@ -182,5 +182,32 @@ public void XmlTokenizerTagWithAttributeContainingEntity()
             Assert.AreEqual("bar", foo.Attributes[0].Key);
             Assert.AreEqual("\"quz\"", foo.Attributes[0].Value);
         }
+
+        [Test]
+        public void XmlTokenizerTagThrowsWithADiamond()
+        {
+            var s = new TextSource("<foo bar=\"a < b\">");
+
+            var t = CreateTokenizer(s);
+            t.IsSuppressingErrors = false;
+            Assert.Throws<XmlParseException>(() => t.Get());
+        }
+
+        [Test]
+        public void XmlTokenizerTagSuppressesWithADiamond()
+        {
+            var s = new TextSource("<foo bar=\"a < b\">");
+            var t = CreateTokenizer(s);
+            t.IsSuppressingErrors = true;
+            var foo = t.Get() as XmlTagToken;
+
+            Assert.IsNotNull(foo);
+            Assert.AreEqual(XmlTokenType.StartTag, foo.Type);
+            Assert.IsFalse(foo.IsSelfClosing);
+            Assert.AreEqual("foo", foo.Name);
+            Assert.AreEqual(1, foo.Attributes.Count);
+            Assert.AreEqual("bar", foo.Attributes[0].Key);
+            Assert.AreEqual("a < b", foo.Attributes[0].Value);
+        }
     }
 }
diff --git a/src/AngleSharp.Xml/Parser/XmlTokenizer.cs b/src/AngleSharp.Xml/Parser/XmlTokenizer.cs
index ecbecc7..1d1c725 100644
--- a/src/AngleSharp.Xml/Parser/XmlTokenizer.cs
+++ b/src/AngleSharp.Xml/Parser/XmlTokenizer.cs
@@ -1046,7 +1046,7 @@ private XmlToken AttributeValue(XmlTagToken tag, Char quote)
                 if (c == Symbols.EndOfFile)
                     throw XmlParseError.EOF.At(GetCurrentPosition());
 
-                if (c == Symbols.LessThan)
+                if (c == Symbols.LessThan && !IsSuppressingErrors)
                     throw XmlParseError.XmlLtInAttributeValue.At(GetCurrentPosition());
 
                 if (c == Symbols.Ampersand)