Fix for bug 46948 - Range operator can now take area-refs for operands

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@761023 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/content/xdocs/changes.xml

@@ -37,6 +37,7 @@
 
 		<!-- Don't forget to update status.xml too! -->
         <release version="3.5-beta6" date="2009-??-??">
+           <action dev="POI-DEVELOPERS" type="fix">46948 - Fixed evaluation of range operator to allow for area-ref operands</action>
            <action dev="POI-DEVELOPERS" type="fix">46918 - Fixed ExtendedPivotTableViewFieldsRecord(SXVDEX) to allow shorter format</action>
            <action dev="POI-DEVELOPERS" type="fix">46898 - Fixed formula evaluator to not cache intermediate circular-reference error results</action>
            <action dev="POI-DEVELOPERS" type="fix">46917 - Fixed PageItemRecord(SXPI) to allow multiple field infos</action>

src/documentation/content/xdocs/status.xml

@@ -34,6 +34,7 @@
 	<!-- Don't forget to update changes.xml too! -->
     <changes>
         <release version="3.5-beta6" date="2009-??-??">
+           <action dev="POI-DEVELOPERS" type="fix">46948 - Fixed evaluation of range operator to allow for area-ref operands</action>
            <action dev="POI-DEVELOPERS" type="fix">46918 - Fixed ExtendedPivotTableViewFieldsRecord(SXVDEX) to allow shorter format</action>
            <action dev="POI-DEVELOPERS" type="fix">46898 - Fixed formula evaluator to not cache intermediate circular-reference error results</action>
            <action dev="POI-DEVELOPERS" type="fix">46917 - Fixed PageItemRecord(SXPI) to allow multiple field infos</action>

src/java/org/apache/poi/hssf/record/formula/eval/RangeEval.java

@@ -36,25 +36,36 @@ public final class RangeEval implements OperationEval {
 		}
 
 		try {
-			RefEval reA = evaluateRef(args[0]);
+			AreaEval reA = evaluateRef(args[0]);
-			RefEval reB = evaluateRef(args[1]);
+			AreaEval reB = evaluateRef(args[1]);
 			return resolveRange(reA, reB);
 		} catch (EvaluationException e) {
 			return e.getErrorEval();
 		}
 	}
 
-	private static AreaEval resolveRange(RefEval reA, RefEval reB) {
+	/**
+	 * @return simple rectangular {@link AreaEval} which fully encloses both areas 
+	 * <tt>aeA</tt> and <tt>aeB</tt>
+	 */
+	private static AreaEval resolveRange(AreaEval aeA, AreaEval aeB) {
+		int aeAfr = aeA.getFirstRow();
+		int aeAfc = aeA.getFirstColumn();
 		
-		int height = reB.getRow() - reA.getRow();
+		int top = Math.min(aeAfr, aeB.getFirstRow());
-		int width = reB.getColumn() - reA.getColumn();
+		int bottom = Math.max(aeA.getLastRow(), aeB.getLastRow());
+		int left = Math.min(aeAfc, aeB.getFirstColumn());
+		int right = Math.max(aeA.getLastColumn(), aeB.getLastColumn());
 		
-		return reA.offset(0, height, 0, width);
+		return aeA.offset(top-aeAfr, bottom-aeAfr, left-aeAfc, right-aeAfc);
 	}
 
-	private static RefEval evaluateRef(Eval arg) throws EvaluationException {
+	private static AreaEval evaluateRef(Eval arg) throws EvaluationException {
+		if (arg instanceof AreaEval) {
+			return (AreaEval) arg;
+		}
 		if (arg instanceof RefEval) {
-			return (RefEval) arg;
+			return ((RefEval) arg).offset(0, 0, 0, 0);
 		}
 		if (arg instanceof ErrorEval) {
 			throw new EvaluationException((ErrorEval)arg);

src/testcases/org/apache/poi/hssf/record/formula/eval/TestRangeEval.java

@@ -17,12 +17,28 @@
 
 package org.apache.poi.hssf.record.formula.eval;
 
+import java.lang.reflect.Field;
+
+import junit.framework.AssertionFailedError;
+import junit.framework.TestCase;
+
+import org.apache.poi.hssf.record.aggregates.FormulaRecordAggregate;
 import org.apache.poi.hssf.record.formula.AreaI;
+import org.apache.poi.hssf.record.formula.AttrPtg;
+import org.apache.poi.hssf.record.formula.FuncVarPtg;
+import org.apache.poi.hssf.record.formula.IntPtg;
+import org.apache.poi.hssf.record.formula.Ptg;
+import org.apache.poi.hssf.record.formula.RangePtg;
+import org.apache.poi.hssf.record.formula.RefPtg;
 import org.apache.poi.hssf.record.formula.AreaI.OffsetArea;
+import org.apache.poi.hssf.usermodel.HSSFCell;
+import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
+import org.apache.poi.hssf.usermodel.HSSFRow;
+import org.apache.poi.hssf.usermodel.HSSFWorkbook;
 import org.apache.poi.hssf.util.AreaReference;
 import org.apache.poi.hssf.util.CellReference;
-
+import org.apache.poi.ss.formula.FormulaParser;
-import junit.framework.TestCase;
+import org.apache.poi.ss.usermodel.CellValue;
 
 /**
  * Test for unary plus operator evaluator.
@@ -89,7 +105,91 @@ public final class TestRangeEval extends TestCase {
 		}
 		public AreaEval offset(int relFirstRowIx, int relLastRowIx, int relFirstColIx,
 				int relLastColIx) {
-			throw new RuntimeException("not expected to be called during this test");
+			AreaI area = new OffsetArea(getFirstRow(), getFirstColumn(),
+					relFirstRowIx, relLastRowIx, relFirstColIx, relLastColIx);
+
+			return new MockAreaEval(area);
 		}
 	}
+
+	public void testRangeUsingOffsetFunc_bug46948() {
+		HSSFWorkbook wb = new HSSFWorkbook();
+		HSSFRow row = wb.createSheet("Sheet1").createRow(0);
+		HSSFCell cellA1 = row.createCell(0);
+		HSSFCell cellB1 = row.createCell(1);
+		row.createCell(2).setCellValue(5.0); // C1
+		row.createCell(3).setCellValue(7.0); // D1
+		row.createCell(4).setCellValue(9.0); // E1
+
+
+		try {
+			cellA1.setCellFormula("SUM(C1:OFFSET(C1,0,B1))");
+		} catch (RuntimeException e) {
+			// TODO fix formula parser to handle ':' as a proper operator
+			if (!e.getClass().getName().startsWith(FormulaParser.class.getName())) {
+				throw e;
+			}
+			// FormulaParseException is expected until the parser is fixed up
+			// Poke the formula in directly:
+			pokeInOffsetFormula(cellA1);
+		}
+
+
+		cellB1.setCellValue(1.0); // range will be C1:D1
+
+		HSSFFormulaEvaluator fe = new HSSFFormulaEvaluator(wb);
+		CellValue cv;
+		try {
+			cv = fe.evaluate(cellA1);
+		} catch (IllegalArgumentException e) {
+			if (e.getMessage().equals("Unexpected ref arg class (org.apache.poi.ss.formula.LazyAreaEval)")) {
+				throw new AssertionFailedError("Identified bug 46948");
+			}
+			throw e;
+		}
+
+		assertEquals(12.0, cv.getNumberValue(), 0.0);
+
+		cellB1.setCellValue(2.0); // range will be C1:E1
+		fe.notifyUpdateCell(cellB1);
+		cv = fe.evaluate(cellA1);
+		assertEquals(21.0, cv.getNumberValue(), 0.0);
+
+		cellB1.setCellValue(0.0); // range will be C1:C1
+		fe.notifyUpdateCell(cellB1);
+		cv = fe.evaluate(cellA1);
+		assertEquals(5.0, cv.getNumberValue(), 0.0);
+	}
+
+	/**
+	 * Directly sets the formula "SUM(C1:OFFSET(C1,0,B1))" in the specified cell.
+	 * This hack can be removed when the formula parser can handle functions as
+	 * operands to the range (:) operator.
+	 *
+	 */
+	private static void pokeInOffsetFormula(HSSFCell cell) {
+		cell.setCellFormula("1");
+		FormulaRecordAggregate fr;
+		try {
+			Field field = HSSFCell.class.getDeclaredField("_record");
+			field.setAccessible(true);
+			fr = (FormulaRecordAggregate) field.get(cell);
+		} catch (IllegalArgumentException e) {
+			throw new RuntimeException(e);
+		} catch (IllegalAccessException e) {
+			throw new RuntimeException(e);
+		} catch (NoSuchFieldException e) {
+			throw new RuntimeException(e);
+		}
+		Ptg[] ptgs = {
+				new RefPtg("C1"),
+				new RefPtg("C1"),
+				new IntPtg(0),
+				new RefPtg("B1"),
+				new FuncVarPtg("OFFSET", (byte)3),
+				RangePtg.instance,
+				AttrPtg.SUM,
+			};
+		fr.setParsedExpression(ptgs);
+	}
 }