Bug 66401: Handle escaped single-quote in formulas properly

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1906217 13f79535-47bb-0310-9956-ffa450edef68

poi/src/main/java/org/apache/poi/ss/formula/FormulaParser.java

@@ -1182,6 +1182,7 @@ public final class FormulaParser {
                         if (look == '\''){
                             // Any single quotes which were already present in the sheet name will be converted to double single quotes ('')
                             // so switch back to single quote
+                            sb.appendCodePoint(look);
                             nextChar();
                             break;
                         }

poi/src/test/java/org/apache/poi/hssf/model/TestFormulaParser.java

@@ -645,7 +645,7 @@ final class TestFormulaParser {
         assertEquals(expectedClasses.length, ptgs.length);
         for (int i = 0; i < expectedClasses.length; i++) {
             assertSame(expectedClasses[i], ptgs[i].getClass(),
-                "difference at token[" + i + "]: expected ("
+                "difference at token[" + i + "] for Ptg " + ptgs[i] + ": expected ("
                 + expectedClasses[i].getName() + ") but got ("
                 + ptgs[i].getClass().getName() + ")");
         }
@@ -1357,6 +1357,17 @@ final class TestFormulaParser {
                 UnionPtg.class
         );
 
+        wb.createSheet("Sh't1");
+        ptgs = parse("'Sh''t1'!$A:$A,'Sh''t1'!$1:$4", wb);
+        confirmTokenClasses(ptgs,
+                MemFuncPtg.class,
+                Area3DPtg.class,
+                Area3DPtg.class,
+                UnionPtg.class
+        );
+        assertEquals(1, ((Area3DPtg)ptgs[1]).getExternSheetIndex());
+        assertEquals(1, ((Area3DPtg)ptgs[2]).getExternSheetIndex());
+
         wb.close();
     }
 

poi/src/test/java/org/apache/poi/sl/draw/geom/TestFormulaParser.java

@@ -22,9 +22,6 @@ import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import org.junit.jupiter.api.Test;
 
-/**
- * Date: 10/24/11
- */
 class TestFormulaParser {
     @Test
     void testParse(){