resolved fdo#48875 do not let ISO 8601 detection override locale's date order

If the locale's date separator was '-' the ISO 8601 detection interfered with
the locale's date order, e.g. DMY in nl_NL locale.

svl/source/numbers/zforfind.cxx

@@ -148,6 +148,7 @@ void ImpSvNumberInputScan::Reset()
     nMayBeMonthDate = 0;
     nAcceptedDatePattern = -2;
     nDatePatternStart = 0;
+    nCanForceToIso8601 = 0;
 }
 
 
@@ -999,6 +1000,50 @@ bool ImpSvNumberInputScan::MayBeIso8601()
 
 //---------------------------------------------------------------------------
 
+bool ImpSvNumberInputScan::CanForceToIso8601( DateFormat eDateFormat )
+{
+    if (nCanForceToIso8601 == 0)
+    {
+        nCanForceToIso8601 = 1;
+        do
+        {
+            if (!MayBeIso8601())
+                break;
+
+            if (nMayBeIso8601 >= 3)
+            {
+                nCanForceToIso8601 = 2; // at least 3 digits in year
+                break;
+            }
+
+            if (pFormatter->GetDateSep() != '-')
+            {
+                nCanForceToIso8601 = 2; // date separator does not interfere
+                break;
+            }
+
+            sal_Int32 n;
+            switch (eDateFormat)
+            {
+                case DMY:               // "day" value out of range => ISO 8601 year
+                    if ((n = sStrArray[nNums[0]].ToInt32()) < 1 || n > 31)
+                        nCanForceToIso8601 = 2;
+                    break;
+                case MDY:               // "month" value out of range => ISO 8601 year
+                    if ((n = sStrArray[nNums[0]].ToInt32()) < 1 || n > 12)
+                        nCanForceToIso8601 = 2;
+                    break;
+                case YMD:               // always possible
+                    nCanForceToIso8601 = 2;
+                    break;
+            }
+        } while (0);
+    }
+    return nCanForceToIso8601 > 1;
+}
+
+//---------------------------------------------------------------------------
+
 bool ImpSvNumberInputScan::MayBeMonthDate()
 {
     if (nMayBeMonthDate == 0)
@@ -1596,7 +1641,7 @@ input for the following reasons:
                             }
                         }
                         // ISO 8601 yyyy-mm-dd forced recognition
-                        DateFormat eDF = (MayBeIso8601() ? YMD : DateFmt);
+                        DateFormat eDF = (CanForceToIso8601( DateFmt) ? YMD : DateFmt);
                         switch (eDF)
                         {
                             case MDY:

svl/source/numbers/zforfind.hxx

@@ -71,19 +71,17 @@ public:
     /// get threshold of two-digit year input
     sal_uInt16  GetYear2000() const { return nYear2000; }
 
-    /** Whether input may be an ISO 8601 date format, yyyy-mm-dd...
+    /** Whether input can be forced to ISO 8601 format.
 
-        Checks if input has at least 3 numbers for yyyy-mm-dd and the separator
-        is '-', and 1<=mm<=12 and 1<=dd<=31.
+        Depends on locale's date separator and a specific date format order.
 
-        @see nMayBeIso8601
-     */
-    bool MayBeIso8601();
+        @param eDateFormat
+            Evaluated only on first call during one scan process, subsequent
+            calls return state of nCanForceToIso8601!
 
-    /** Whether input may be a dd-month-yy format, with month name, not
-        number.
+        @see nCanForceToIso8601
      */
-    bool MayBeMonthDate();
+    bool CanForceToIso8601( DateFormat eDateFormat );
 
 private:
     SvNumberFormatter*  pFormatter;
@@ -154,6 +152,16 @@ private:
      */
     sal_uInt8    nMayBeIso8601;
 
+    /** State of ISO 8601 can be forced.
+
+        0:= don't know yet
+        1:= no
+        2:= yes
+
+        @see CanForceToIso8601()
+     */
+    sal_uInt8   nCanForceToIso8601;
+
     /** State of dd-month-yy or yy-month-dd detection, with month name.
 
         0:= don't know yet
@@ -364,6 +372,22 @@ private:
      */
     DateFormat GetDateOrder();
 
+    /** Whether input may be an ISO 8601 date format, yyyy-mm-dd...
+
+        Checks if input has at least 3 numbers for yyyy-mm-dd and the separator
+        is '-', and 1<=mm<=12 and 1<=dd<=31.
+
+        @see nMayBeIso8601
+     */
+    bool MayBeIso8601();
+
+    /** Whether input may be a dd-month-yy format, with month name, not
+        number.
+
+        @see nMayBeMonthDate
+     */
+    bool MayBeMonthDate();
+
 #endif  // _ZFORFIND_CXX
 };
 

svl/source/numbers/zforlist.cxx

@@ -1180,7 +1180,7 @@ bool SvNumberFormatter::IsNumberFormat(const String& sString,
         {
             case NUMBERFORMAT_DATE :
                 // Preserve ISO 8601 input.
-                if (pStringScanner->MayBeIso8601())
+                if (pStringScanner->CanForceToIso8601( DMY))
                     F_Index = GetFormatIndex( NF_DATE_DIN_YYYYMMDD, ActLnge );
                 else
                     F_Index = GetStandardFormat( RType, ActLnge );