bug 56781,60246: fix named range validation to match valid name rules per Excel docs

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1764854 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/usermodel/HSSFName.java

@@ -21,9 +21,11 @@ import org.apache.poi.hssf.model.HSSFFormulaParser;
 import org.apache.poi.hssf.model.InternalWorkbook;
 import org.apache.poi.hssf.record.NameCommentRecord;
 import org.apache.poi.hssf.record.NameRecord;
+import org.apache.poi.ss.SpreadsheetVersion;
 import org.apache.poi.ss.formula.FormulaType;
 import org.apache.poi.ss.formula.ptg.Ptg;
 import org.apache.poi.ss.usermodel.Name;
+import org.apache.poi.ss.util.CellReference;
 
 /**
  * High Level Representation of a 'defined name' which could be a 'built-in' name,
@@ -155,36 +157,70 @@ public final class HSSFName implements Name {
         }
     }
 
+    /**
+     * https://support.office.com/en-us/article/Define-and-use-names-in-formulas-4D0F13AC-53B7-422E-AFD2-ABD7FF379C64#bmsyntax_rules_for_names
+     * 
+     * Valid characters:
+     *   First character: { letter | underscore | backslash }
+     *   Remaining characters: { letter | number | period | underscore }
+     *   
+     * Cell shorthand: cannot be { "C" | "c" | "R" | "r" }
+     * 
+     * Cell references disallowed: cannot be a cell reference $A$1 or R1C1
+     * 
+     * Spaces are not valid (follows from valid characters above)
+     * 
+     * Name length: (XSSF-specific?) 255 characters maximum
+     * 
+     * Case sensitivity: all names are case-insensitive
+     * 
+     * Uniqueness: must be unique (for names with the same scope)
+     *
+     * @param name
+     */
     private static void validateName(String name) {
-        /* equivalent to:
+
-        Pattern.compile(
-                "[\\p{IsAlphabetic}_]" +
-                "[\\p{IsAlphabetic}0-9_\\\\]*",
-                Pattern.CASE_INSENSITIVE).matcher(name).matches();
-        \p{IsAlphabetic} doesn't work on Java 6, and other regex-based character classes don't work on unicode
-        thus we are stuck with Character.isLetter (for now).
-        */
-        
         if (name.length() == 0) {
             throw new IllegalArgumentException("Name cannot be blank");
         }
+        if (name.length() > 255) {
+            throw new IllegalArgumentException("Invalid name: '"+name+"': cannot exceed 255 characters in length");
+        }
+        if (name.equalsIgnoreCase("R") || name.equalsIgnoreCase("C")) {
+            throw new IllegalArgumentException("Invalid name: '"+name+"': cannot be special shorthand R or C");
+        }
         
         // is first character valid?
         char c = name.charAt(0);
-        String allowedSymbols = "_";
+        String allowedSymbols = "_\\";
         boolean characterIsValid = (Character.isLetter(c) || allowedSymbols.indexOf(c) != -1);
         if (!characterIsValid) {
             throw new IllegalArgumentException("Invalid name: '"+name+"': first character must be underscore or a letter");
         }
         
         // are all other characters valid?
-        allowedSymbols = "_\\"; //backslashes needed for unicode escape
+        allowedSymbols = "_.\\"; //backslashes needed for unicode escape
         for (final char ch : name.toCharArray()) {
             characterIsValid = (Character.isLetterOrDigit(ch) || allowedSymbols.indexOf(ch) != -1);
             if (!characterIsValid) {
-                throw new IllegalArgumentException("Invalid name: '"+name+"'");
+                throw new IllegalArgumentException("Invalid name: '"+name+"': name must be letter, digit, period, or underscore");
             }
         }
+        
+        // Is the name a valid $A$1 cell reference
+        // Because $, :, and ! are disallowed characters, A1-style references become just a letter-number combination
+        if (name.matches("[A-Za-z]+\\d+")) {
+            String col = name.replaceAll("\\d", "");
+            String row = name.replaceAll("[A-Za-z]", "");
+            if (CellReference.cellReferenceIsWithinRange(col, row, SpreadsheetVersion.EXCEL97)) {
+                throw new IllegalArgumentException("Invalid name: '"+name+"': cannot be $A$1-style cell reference");
+            }
+        }
+        
+        // Is the name a valid R1C1 cell reference?
+        if (name.matches("[Rr]\\d+[Cc]\\d+")) {
+            throw new IllegalArgumentException("Invalid name: '"+name+"': cannot be R1C1-style cell reference");
+        }
     }
 
     public void setRefersToFormula(String formulaText) {

src/ooxml/java/org/apache/poi/xssf/usermodel/XSSFName.java

@@ -16,12 +16,14 @@
 ==================================================================== */
 package org.apache.poi.xssf.usermodel;
 
+import org.apache.poi.ss.SpreadsheetVersion;
 import org.apache.poi.ss.formula.ptg.Ptg;
 
 import org.apache.poi.ss.formula.FormulaParser;
 import org.apache.poi.ss.formula.FormulaType;
 import org.apache.poi.ss.usermodel.Name;
 import org.apache.poi.ss.util.AreaReference;
+import org.apache.poi.ss.util.CellReference;
 import org.openxmlformats.schemas.spreadsheetml.x2006.main.CTDefinedName;
 
 /**
@@ -345,35 +347,69 @@ public final class XSSFName implements Name {
         return _ctName.toString().equals(cf.getCTName().toString());
     }
     
+    /**
+     * https://support.office.com/en-us/article/Define-and-use-names-in-formulas-4D0F13AC-53B7-422E-AFD2-ABD7FF379C64#bmsyntax_rules_for_names
+     * 
+     * Valid characters:
+     *   First character: { letter | underscore | backslash }
+     *   Remaining characters: { letter | number | period | underscore }
+     *   
+     * Cell shorthand: cannot be { "C" | "c" | "R" | "r" }
+     * 
+     * Cell references disallowed: cannot be a cell reference $A$1 or R1C1
+     * 
+     * Spaces are not valid (follows from valid characters above)
+     * 
+     * Name length: (XSSF-specific?) 255 characters maximum
+     * 
+     * Case sensitivity: all names are case-insensitive
+     * 
+     * Uniqueness: must be unique (for names with the same scope)
+     *
+     * @param name
+     */
     private static void validateName(String name) {
-        /* equivalent to:
-        Pattern.compile(
-                "[\\p{IsAlphabetic}_]" +
-                "[\\p{IsAlphabetic}0-9_\\\\]*",
-                Pattern.CASE_INSENSITIVE).matcher(name).matches();
-        \p{IsAlphabetic} doesn't work on Java 6, and other regex-based character classes don't work on unicode
-        thus we are stuck with Character.isLetter (for now).
-        */
         
         if (name.length() == 0) {
             throw new IllegalArgumentException("Name cannot be blank");
         }
+        if (name.length() > 255) {
+            throw new IllegalArgumentException("Invalid name: '"+name+"': cannot exceed 255 characters in length");
+        }
+        if (name.equalsIgnoreCase("R") || name.equalsIgnoreCase("C")) {
+            throw new IllegalArgumentException("Invalid name: '"+name+"': cannot be special shorthand R or C");
+        }
         
         // is first character valid?
         char c = name.charAt(0);
-        String allowedSymbols = "_";
+        String allowedSymbols = "_\\";
         boolean characterIsValid = (Character.isLetter(c) || allowedSymbols.indexOf(c) != -1);
         if (!characterIsValid) {
             throw new IllegalArgumentException("Invalid name: '"+name+"': first character must be underscore or a letter");
         }
         
         // are all other characters valid?
-        allowedSymbols = "_\\"; //backslashes needed for unicode escape
+        allowedSymbols = "_.\\"; //backslashes needed for unicode escape
         for (final char ch : name.toCharArray()) {
             characterIsValid = (Character.isLetterOrDigit(ch) || allowedSymbols.indexOf(ch) != -1);
             if (!characterIsValid) {
-                throw new IllegalArgumentException("Invalid name: '"+name+"'");
+                throw new IllegalArgumentException("Invalid name: '"+name+"': name must be letter, digit, period, or underscore");
             }
         }
+        
+        // Is the name a valid $A$1 cell reference
+        // Because $, :, and ! are disallowed characters, A1-style references become just a letter-number combination
+        if (name.matches("[A-Za-z]+\\d+")) {
+            String col = name.replaceAll("\\d", "");
+            String row = name.replaceAll("[A-Za-z]", "");
+            if (CellReference.cellReferenceIsWithinRange(col, row, SpreadsheetVersion.EXCEL97)) {
+                throw new IllegalArgumentException("Invalid name: '"+name+"': cannot be $A$1-style cell reference");
+            }
+        }
+        
+        // Is the name a valid R1C1 cell reference?
+        if (name.matches("[Rr]\\d+[Cc]\\d+")) {
+            throw new IllegalArgumentException("Invalid name: '"+name+"': cannot be R1C1-style cell reference");
+        }
     }
 }

src/testcases/org/apache/poi/ss/usermodel/BaseTestNamedRange.java

@@ -673,22 +673,33 @@ public abstract class BaseTestNamedRange {
         wb.close();
     }
     
+    // bug 56781: name validation only checks for first character's validity and presence of spaces
+    // bug 60246: validate name does not allow DOT in named ranges
     @Test
-    public void test56781() throws IOException {
+    public void testValid() throws IOException {
         Workbook wb = _testDataProvider.createWorkbook();
         
         Name name = wb.createName();
         for (String valid : Arrays.asList(
                 "Hello",
                 "number1",
-                "_underscore"
+                "_underscore",
-                //"p.e.r.o.i.d.s",
+                "underscore_",
-                //"\\Backslash",
+                "p.e.r.o.i.d.s",
-                //"Backslash\\"
+                "\\Backslash",
+                "Backslash\\"
                 )) {
             name.setNameName(valid);
         }
         
+        wb.close();
+    }
+    
+    @Test
+    public void testInvalid() throws IOException {
+        Workbook wb = _testDataProvider.createWorkbook();
+        
+        Name name = wb.createName();
         try {
             name.setNameName("");
             fail("expected exception: (blank)");
@@ -704,7 +715,18 @@ public abstract class BaseTestNamedRange {
                 "Colon:",
                 "A-Minus",
                 "A+Plus",
-                "Dollar$")) {
+                "Dollar$",
+                ".periodAtBeginning",
+                "R", //special shorthand
+                "C", //special shorthand
+                "A1", // A1-style cell reference
+                "R1C1", // R1C1-style cell reference
+                "NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters..."+
+                "NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters..."+
+                "NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters..."+
+                "NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters..."+
+                "NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters.NameThatIsLongerThan255Characters"
+                )) {
             try {
                 name.setNameName(invalid);
                 fail("expected exception: " + invalid);