fix: selector isMatchRoot not working

Author: lisonge

selector/src/commonMain/kotlin/li/songe/selector/property/PropertyWrapper.kt

@@ -36,7 +36,12 @@ data class PropertyWrapper(
 
     val isMatchRoot = segment.units.any {
         val e = it.expression
-        e is BinaryExpression && e.operator == CompareOperator.Equal && e.left.value == "parent" && e.right.value == "null"
+        e is BinaryExpression && e.operator == CompareOperator.Equal && when {
+            // null == Identifier(name="parent")
+            e.right.value == null && e.left.value == "parent" -> true
+            e.left.value == null && e.right.value == "parent" -> true
+            else -> false
+        }
     }
 
     val fastQueryList by lazy { segment.fastQueryList ?: emptyList() }

selector/src/commonMain/kotlin/li/songe/selector/unit/LogicalSelectorExpression.kt

@@ -57,7 +57,10 @@ data class LogicalSelectorExpression(
     }
 
     override val isMatchRoot: Boolean
-        get() = left.isMatchRoot && operator == SelectorLogicalOperator.AndOperator
+        get() = when (operator) {
+            SelectorLogicalOperator.AndOperator -> left.isMatchRoot || right.isMatchRoot
+            SelectorLogicalOperator.OrOperator -> left.isMatchRoot && right.isMatchRoot
+        }
 
     override val fastQueryList: List<FastQuery>
         get() = left.fastQueryList + right.fastQueryList

selector/src/jvmTest/kotlin/li/songe/selector/ParserUnitTest.kt

@@ -163,4 +163,10 @@ class ParserUnitTest {
         println("selector: ${ast.value}")
         println("ast: ${ast.stringify()}")
     }
+
+    @Test
+    fun root() {
+        assert(Selector.parse("[null=parent]").isMatchRoot)
+        assert(Selector.parse("[parent=null]").isMatchRoot)
+    }
 }