add xmatch test

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1895615 13f79535-47bb-0310-9956-ffa450edef68

poi/src/main/java/org/apache/poi/ss/formula/functions/LookupUtils.java

@@ -623,7 +623,30 @@ public final class LookupUtils {
     }
 
     public static int xlookupIndexOfValue(ValueEval lookupValue, ValueVector vector, MatchMode matchMode, SearchMode searchMode) throws EvaluationException {
-        LookupValueComparer lookupComparer = createTolerantLookupComparer(lookupValue, matchMode != MatchMode.WildcardMatch, true);
+        ValueEval modifiedLookup = lookupValue;
+        if (lookupValue instanceof StringEval &&
+                (matchMode == MatchMode.ExactMatchFallbackToLargerValue || matchMode == MatchMode.ExactMatchFallbackToSmallerValue)) {
+            String lookupText = ((StringEval)lookupValue).getStringValue();
+            StringBuilder sb = new StringBuilder(lookupText.length());
+            boolean containsWildcard = false;
+            for (char c : lookupText.toCharArray()) {
+                switch (c) {
+                    case '~':
+                    case '?':
+                    case '*':
+                        containsWildcard = true;
+                        break;
+                    default:
+                        sb.append(c);
+                }
+                if (containsWildcard)
+                    break;
+            }
+            if (containsWildcard) {
+                modifiedLookup = new StringEval(sb.toString());
+            }
+        }
+        LookupValueComparer lookupComparer = createTolerantLookupComparer(modifiedLookup, matchMode != MatchMode.WildcardMatch, true);
         int result;
         if (searchMode == SearchMode.BinarySearchForward) {
             result = binarySearchIndexOfValue(lookupComparer, vector, matchMode, false);

poi/src/test/java/org/apache/poi/ss/formula/atp/TestXMatchFunction.java

@@ -21,12 +21,12 @@ import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.ss.usermodel.FormulaError;
 import org.junit.jupiter.api.Test;
 
 import java.io.IOException;
 
-import static org.apache.poi.ss.util.Utils.addRow;
-import static org.apache.poi.ss.util.Utils.assertDouble;
+import static org.apache.poi.ss.util.Utils.*;
 
 /**
  * Testcase for function XMATCH()
@@ -40,16 +40,20 @@ public class TestXMatchFunction {
             HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
             HSSFCell cell = wb.getSheetAt(0).getRow(2).createCell(5);
             assertDouble(fe, cell, "XMATCH(E3,C3:C7)", 2);
+            assertError(fe, cell, "XMATCH(\"Gra\",C3:C7)", FormulaError.NA);
         }
     }
 
     @Test
     void testMicrosoftExample1() throws IOException {
-        try (HSSFWorkbook wb = initWorkbook("Gra")) {
+        try (HSSFWorkbook wb = initWorkbook("Gra?")) {
             HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
             HSSFCell cell = wb.getSheetAt(0).getRow(2).createCell(5);
-            //TODO investigate issue with `Gra?`
             assertDouble(fe, cell, "XMATCH(E3,C3:C7,1)", 2);
+            assertDouble(fe, cell, "XMATCH(E3,C3:C7,-1)", 5);
+            assertDouble(fe, cell, "XMATCH(\"Gra\",C3:C7,1)", 2);
+            assertDouble(fe, cell, "XMATCH(\"Graz\",C3:C7,1)", 3);
+            assertDouble(fe, cell, "XMATCH(\"Graz\",C3:C7,-1)", 2);
         }
     }