fix: horizontal line lexed as table header

Author: iamgio

quarkdown-core/src/main/kotlin/com/quarkdown/core/lexer/patterns/BaseMarkdownBlockTokenRegexPatterns.kt

@@ -244,9 +244,9 @@ open class BaseMarkdownBlockTokenRegexPatterns {
                         // Header
                         "^ *([^\\n ].*)\\n" +
                             // Align
-                            " {0,3}((?:\\|?\\s*:?-+:?\\s*)+\\|?)\\n" +
+                            " {0,3}((?:\\| *)?:?-+:? *(?:\\| *:?-+:? *)*(?:\\| *)?)" +
                             // Cells
-                            "((?:[^\\n]*\\S[^\\n]*\\n?)*)",
+                            "(?:\\n((?:(?! *\\n|interruption).*(?:\\n|$))*)\\n*|$)",
                     ).withReference("interruption", interruptionRule(includeTable = false).pattern)
                         .withReference("|table", "")
                         .build(),

quarkdown-core/src/test/kotlin/com/quarkdown/core/BlockParserTest.kt

@@ -245,7 +245,7 @@ class BlockParserTest {
     @Test
     fun horizontalRule() {
         val nodes = blocksIterator<HorizontalRule>(readSource("/parsing/hr.md"), assertType = false)
-        assertEquals(6, nodes.asSequence().count())
+        assertEquals(7, nodes.asSequence().count())
     }
 
     @Test

quarkdown-core/src/test/resources/parsing/hr.md

@@ -20,4 +20,10 @@ _
 
 ===
 
---- A
+--- A
+
+X
+
+---
+
+Y