Bug 61472: Convert date/time strings to numbers when evaluating formulas

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1855662 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/ss/formula/eval/OperandResolver.java

 package org.apache.poi.ss.formula.eval;
 
 import org.apache.poi.ss.formula.EvaluationCell;
+import org.apache.poi.ss.usermodel.DateUtil;
 import org.apache.poi.ss.util.CellRangeAddress;
 
+import java.time.DateTimeException;
 import java.util.regex.Pattern;
 
 /**
             return ((NumericValueEval)ev).getNumberValue();
         }
         if (ev instanceof StringEval) {
-            Double dd = parseDouble(((StringEval) ev).getStringValue());
+            String sval = ((StringEval) ev).getStringValue();
+            Double dd = parseDouble(sval);
+            if(dd == null) dd = parseDateTime(sval);
             if (dd == null) {
                 throw EvaluationException.invalidValue();
             }
         
     }
 
+    public static Double parseDateTime(String pText) {
+
+        try {
+            return DateUtil.parseDateTime(pText);
+        } catch (DateTimeException e) {
+            return null;
+        }
+
+    }
+
     /**
      * @param ve must be a <tt>NumberEval</tt>, <tt>StringEval</tt>, <tt>BoolEval</tt>, or <tt>BlankEval</tt>
      * @return the converted string value. never <code>null</code>

src/java/org/apache/poi/ss/formula/functions/Value.java

 import org.apache.poi.ss.formula.eval.NumberEval;
 import org.apache.poi.ss.formula.eval.OperandResolver;
 import org.apache.poi.ss.formula.eval.ValueEval;
+import org.apache.poi.ss.usermodel.DateUtil;
+
+import java.time.DateTimeException;
 
 /**
  * Implementation for Excel VALUE() function.<p>
 		}
 		String strText = OperandResolver.coerceValueToString(veText);
 		Double result = convertTextToNumber(strText);
+		if(result == null) result = parseDateTime(strText);
 		if (result == null) {
 			return ErrorEval.VALUE_INVALID;
 		}
 	 *
 	 * @return <code>null</code> if there is any problem converting the text
 	 */
-	private static Double convertTextToNumber(String strText) {
+	public static Double convertTextToNumber(String strText) {
 		boolean foundCurrency = false;
 		boolean foundUnaryPlus = false;
 		boolean foundUnaryMinus = false;
         double result = foundUnaryMinus ? -d : d;
         return foundPercentage ? result/100. : result;
 	}
+
+	public static Double parseDateTime(String pText) {
+
+		try {
+			return DateUtil.parseDateTime(pText);
+		} catch (DateTimeException e) {
+			return null;
+		}
+
+	}
 }

src/java/org/apache/poi/ss/usermodel/DateUtil.java

 
 package org.apache.poi.ss.usermodel;
 
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.time.format.DateTimeFormatterBuilder;
+import java.time.temporal.ChronoField;
+import java.time.temporal.TemporalAccessor;
+import java.time.temporal.TemporalQueries;
 import java.util.Calendar;
 import java.util.Date;
 import java.util.TimeZone;
     // for format which start with "[DBNum1]" or "[DBNum2]" or "[DBNum3]" could be a Chinese date
     private static final Pattern date_ptrn5 = Pattern.compile("^\\[DBNum(1|2|3)\\]");
 
+    private static final DateTimeFormatter dateTimeFormats = new DateTimeFormatterBuilder()
+            .appendPattern("[dd MMM[ yyyy]][[ ]h:m[:s] a][[ ]H:m[:s]]")
+            .appendPattern("[[yyyy ]dd-MMM[-yyyy]][[ ]h:m[:s] a][[ ]H:m[:s]]")
+            .appendPattern("[M/dd[/yyyy]][[ ]h:m[:s] a][[ ]H:m[:s]]")
+            .appendPattern("[[yyyy/]M/dd][[ ]h:m[:s] a][[ ]H:m[:s]]")
+            .parseDefaulting(ChronoField.YEAR_OF_ERA, Calendar.getInstance().get(Calendar.YEAR))
+            .toFormatter();
+
     /**
      * Given a Date, converts it into a double representing its internal Excel representation,
      *   which is the number of days since 1/1/1900. Fractional days represent hours, minutes, and seconds.
         }
         return result;
     }
+
+    public static Double parseDateTime(String str){
+        TemporalAccessor tmp = dateTimeFormats.parse(str.replaceAll("\\s+", " "));
+        LocalTime time = tmp.query(TemporalQueries.localTime());
+        LocalDate date = tmp.query(TemporalQueries.localDate());
+        if(time == null && date == null) return null;
+
+        double tm = 0;
+        if(date != null) {
+            Date d = Date.from(date.atStartOfDay().atZone(ZoneId.systemDefault()).toInstant());
+            tm = DateUtil.getExcelDate(d);
+        }
+        if(time != null) tm += 1.0*time.toSecondOfDay()/SECONDS_PER_DAY;
+
+        return tm;
+    }
 }

src/testcases/org/apache/poi/ss/formula/eval/TestOperandResolver.java

 import junit.framework.AssertionFailedError;
 import junit.framework.TestCase;
 
+import java.util.LinkedHashMap;
+import java.util.Map;
+
 /**
  * Tests for <tt>OperandResolver</tt>
  *
 			assertNull(OperandResolver.parseDouble(value));
 		}
 	}
+
+	public void testCoerceDateStringToNumber() throws EvaluationException {
+		Map<String, Double> values = new LinkedHashMap<>();
+		values.put("2019/1/18", 43483.);
+		values.put("01/18/2019", 43483.);
+		values.put("18 Jan 2019", 43483.);
+		values.put("18-Jan-2019", 43483.);
+
+		for (String str : values.keySet()) {
+			assertEquals(OperandResolver.coerceValueToDouble(new StringEval(str)), values.get(str), 0.00001);
+		}
+	}
+
+	public void testCoerceTimeStringToNumber() throws EvaluationException {
+		Map<String, Double> values = new LinkedHashMap<>();
+		values.put("00:00", 0.0);
+		values.put("12:00", 0.5);
+		values.put("15:43:09", 0.654965278);
+		values.put("15:43", 0.654861111);
+		values.put("3:43 PM", 0.654861111);
+
+		for (String str : values.keySet()) {
+			assertEquals(OperandResolver.coerceValueToDouble(new StringEval(str)), values.get(str), 0.00001);
+		}
+	}
 }

src/testcases/org/apache/poi/ss/formula/functions/BaseTestFunctionsFromSpreadsheet.java

     public int formulasRowIdx;
     @Parameter(value = 4)
     public HSSFFormulaEvaluator evaluator;
+    @Parameter(value = 5)
+    public int precisionColumnIndex;
 
 
     
             HSSFSheet sheet = workbook.getSheetAt(sheetIdx);
             processFunctionGroup(data, sheet, SS.START_TEST_CASES_ROW_INDEX, filename);
         }
-        
+
         workbook.close();
         
         return data;
     private static void processFunctionGroup(List<Object[]> data, HSSFSheet sheet, final int startRowIndex, String filename) {
         HSSFFormulaEvaluator evaluator = new HSSFFormulaEvaluator(sheet.getWorkbook());
 
+        int precisionColumnIndex = -1;
+        HSSFRow precisionRow = sheet.getWorkbook().getSheetAt(0).getRow(11);
+        HSSFCell precisionCell = precisionRow == null ? null : precisionRow.getCell(0);
+        if(precisionCell != null && precisionCell.getCellType() == CellType.NUMERIC){
+            precisionColumnIndex = (int)precisionCell.getNumericCellValue();
+        }
+
+
         String currentGroupComment = "";
         final int maxRows = sheet.getLastRowNum()+1;
         for(int rowIndex=startRowIndex; rowIndex<maxRows; rowIndex++) {
                 testName = evalCell.getCellFormula();
             }
             
-            data.add(new Object[]{testName, filename, sheet, rowIndex, evaluator});
+            data.add(new Object[]{testName, filename, sheet, rowIndex, evaluator, precisionColumnIndex});
         }
         fail("Missing end marker '" + SS.TEST_CASES_END_MARKER + "' on sheet '" + sheet.getSheetName() + "'");
     }
         HSSFRow r = sheet.getRow(formulasRowIdx);
         HSSFCell evalCell = r.getCell(SS.COLUMN_INDEX_EVALUATION);
         HSSFCell expectedCell = r.getCell(SS.COLUMN_INDEX_EXPECTED_RESULT);
-        
+        HSSFCell precisionCell = r.getCell(precisionColumnIndex);
+
         CellReference cr = new CellReference(sheet.getSheetName(), formulasRowIdx, evalCell.getColumnIndex(), false, false);
         String msg = String.format(Locale.ROOT, "In %s %s {=%s} '%s'"
             , filename, cr.formatAsString(), evalCell.getCellFormula(), testName);
             case FORMULA: // will never be used, since we will call method after formula evaluation
                 fail("Cannot expect formula as result of formula evaluation: " + msg);
             case NUMERIC:
-                assertEquals(expectedCell.getNumericCellValue(), actualValue.getNumberValue(), 0.0);
+                double precision = precisionCell != null && precisionCell.getCellType() == CellType.NUMERIC
+                        ? precisionCell.getNumericCellValue() : 0.0;
+                assertEquals(expectedCell.getNumericCellValue(), actualValue.getNumberValue(), precision);
                 break;
             case STRING:
                 assertEquals(msg, expectedCell.getRichStringCellValue().getString(), actualValue.getStringValue());
         HSSFSheet sheet = workbook.getSheetAt(0);
         String specifiedClassName = sheet.getRow(2).getCell(0).getRichStringCellValue().getString();
         assertEquals("Test class name in spreadsheet comment", clazz.getName(), specifiedClassName);
+
+        HSSFRow precisionRow = sheet.getRow(11);
+        HSSFCell precisionCell = precisionRow == null ? null : precisionRow.getCell(0);
+        if(precisionCell != null && precisionCell.getCellType() == CellType.NUMERIC){
+
+        }
     }
 
     /**

src/testcases/org/apache/poi/ss/formula/functions/TestDateTimeToNumberFromSpreadsheet.java

+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.ss.formula.functions;
+
+import org.junit.runners.Parameterized.Parameters;
+
+import java.util.Collection;
+
+public class TestDateTimeToNumberFromSpreadsheet extends BaseTestFunctionsFromSpreadsheet {
+    @Parameters(name="{0}")
+    public static Collection<Object[]> data() throws Exception {
+        return data(TestDateTimeToNumberFromSpreadsheet.class, "DateTimeToNumberTestCases.xls");
+    }
+}