[fix] castable as for untyped atomic value(s)

exist-core/src/main/java/org/exist/xquery/value/UntypedAtomicValue.java

@@ -65,6 +65,16 @@ public static AtomicValue convertTo(UntypedAtomicValue strVal, String value, int
  return strVal == null ? new UntypedAtomicValue(expression, value) : strVal;
  case Type.STRING:
  return new StringValue(expression, value);
+ case Type.NORMALIZED_STRING:
+ case Type.TOKEN:
+ case Type.LANGUAGE:
+ case Type.NMTOKEN:
+ case Type.NAME:
+ case Type.NCNAME:
+ case Type.ID:
+ case Type.IDREF:
+ case Type.ENTITY:
+ return new StringValue(expression, value, requiredType);
  case Type.ANY_URI:
  return new AnyURIValue(expression, value);
  case Type.BOOLEAN:

exist-core/src/test/xquery/xquery3/castable-untyped-atomic.xqm

@@ -0,0 +1,79 @@
+
+(:
+ : eXist-db Open Source Native XML Database
+ : Copyright (C) 2001 The eXist-db Authors
+ :
+ : [email protected]
+ : http://www.exist-db.org
+ :
+ : This library is free software; you can redistribute it and/or
+ : modify it under the terms of the GNU Lesser General Public
+ : License as published by the Free Software Foundation; either
+ : version 2.1 of the License, or (at your option) any later version.
+ :
+ : This library is distributed in the hope that it will be useful,
+ : but WITHOUT ANY WARRANTY; without even the implied warranty of
+ : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ : Lesser General Public License for more details.
+ :
+ : You should have received a copy of the GNU Lesser General Public
+ : License along with this library; if not, write to the Free Software
+ : Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ :)
+ (:~
+ : @see https://github.com/eXist-db/exist/issues/4518
+ :)
+xquery version "3.1";
+
+module namespace ca="http://exist-db.org/xquery/test";
+
+declare namespace test="http://exist-db.org/xquery/xqsuite";
+
+(: atomic values not explicitly converted to strings were falsely returning false to _castable_as_
+ in other words, all these tests were returning nc="false"
+:)
+declare
+%test:args("ixml") %test:assertEquals("<result name=""ixml"" nc=""true""/>")
+%test:args("comment") %test:assertEquals("<result name=""comment"" nc=""true""/>")
+%test:args("apple-jack") %test:assertEquals("<result name=""apple-jack"" nc=""true""/>")
+%test:args("123") %test:assertEquals("<result name=""123"" nc=""false""/>")
+%test:args("élève") %test:assertEquals("<result name=""élève"" nc=""true""/>")
+%test:args("pfx:suffix") %test:assertEquals("<result name=""pfx:suffix"" nc=""false""/>")
+function ca:n-castable($d) {
+ let $doc := <e name="e"><f n="{$d}"/></e>
+ let $el := $doc/descendant::*[exists(@n)]
+ let $n := $el/@n
+ return <result name="{$n}" nc="{$n castable as xs:NCName}"/>
+};
+
+(: explicit string conversion was always working - for reference :)
+declare
+%test:args("ixml") %test:assertEquals("<result name=""ixml"" nc=""true""/>")
+%test:args("comment") %test:assertEquals("<result name=""comment"" nc=""true""/>")
+%test:args("apple-jack") %test:assertEquals("<result name=""apple-jack"" nc=""true""/>")
+%test:args("123") %test:assertEquals("<result name=""123"" nc=""false""/>")
+%test:args("élève") %test:assertEquals("<result name=""élève"" nc=""true""/>")
+%test:args("pfx:suffix") %test:assertEquals("<result name=""pfx:suffix"" nc=""false""/>")
+function ca:s-castable($d) {
+ let $doc := <e name="e"><f n="{$d}"/></e>
+ let $el := $doc/descendant::*[exists(@n)]
+ let $n := $el/@n, $s := string($n)
+ return <result name="{$n}" nc="{$s castable as xs:NCName}"/>
+};
+
+(: sanity check that casting accepts the same values as castable as :)
+declare
+%test:args("ixml") %test:assertEquals("<result name=""ixml"" nc=""true""/>")
+%test:args("comment") %test:assertEquals("<result name=""comment"" nc=""true""/>")
+%test:args("apple-jack") %test:assertEquals("<result name=""apple-jack"" nc=""true""/>")
+%test:args("123") %test:assertError("err:")
+%test:args("élève") %test:assertEquals("<result name=""élève"" nc=""true""/>")
+%test:args("pfx:suffix") %test:assertError("err:")
+function ca:s-cast-castable($d) {
+ let $doc := <e name="e"><f n="{$d}"/></e>
+ let $el := $doc/descendant::*[exists(@n)]
+ let $n := $el/@n, $ncname := xs:NCName($n)
+ return <result name="{$n}" nc="{$ncname castable as xs:NCName}"/>
+};
+
+