Bug 219829

Allow mixing length and percentage values with keyword values for the background-position property, which is now allowed per section 14.2.1 of CSS 2.1
r+sr=dbaron
a=asa

content/html/style/src/nsCSSParser.cpp

@@ -3976,8 +3976,8 @@ PRBool CSSParserImpl::ParseProperty(nsresult& aErrorCode,
 #define BG_BOTTOM  0x04
 #define BG_LEFT    0x08
 #define BG_RIGHT   0x10
-#define BG_CENTER1 0x20
+#define BG_CTB    (BG_CENTER | BG_TOP | BG_BOTTOM)
-#define BG_CENTER2 0x40
+#define BG_CLR    (BG_CENTER | BG_LEFT | BG_RIGHT)
 
 // Note: Don't change this table unless you update
 // parseBackgroundPosition!
@@ -4442,6 +4442,30 @@ PRBool CSSParserImpl::ParseAzimuth(nsresult& aErrorCode, nsCSSValue& aValue)
   return PR_FALSE;
 }
 
+static nsCSSValue
+BackgroundPositionMaskToCSSValue(PRInt32 aMask, PRBool isX)
+{
+  PRInt32 pct = 50;
+  if (isX) {
+    if (aMask & BG_LEFT) {
+      pct = 0;
+    }
+    else if (aMask & BG_RIGHT) {
+      pct = 100;
+    }
+  }
+  else {
+    if (aMask & BG_TOP) {
+      pct = 0;
+    }
+    else if (aMask & BG_BOTTOM) {
+      pct = 100;
+    }
+  }
+
+  return nsCSSValue(pct, eCSSUnit_Enumerated);
+}
+
 PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
 {
   const PRInt32 numProps = 6;
@@ -4461,36 +4485,11 @@ PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
   }
 
   if (0 != (found & 0x30)) {  // found one or more position values, validate them
-    if (0 == (found & 0x20)) {  // x value only
+    if (0 == (found & 0x20)) {
       if (eCSSUnit_Enumerated == values[4].GetUnit()) {
-        switch (values[4].GetIntValue()) {
+        PRInt32 mask = values[4].GetIntValue();
-          case BG_CENTER:
+        values[4] = BackgroundPositionMaskToCSSValue(mask, PR_TRUE);
-            values[4].SetIntValue(50, eCSSUnit_Enumerated);
+        values[5] = BackgroundPositionMaskToCSSValue(mask, PR_FALSE);
-            values[5].SetIntValue(50, eCSSUnit_Enumerated);
-            break;
-          case BG_TOP:
-            values[4].SetIntValue(50, eCSSUnit_Enumerated);
-            values[5].SetIntValue(0, eCSSUnit_Enumerated);
-            break;
-          case BG_BOTTOM:
-            values[4].SetIntValue(50, eCSSUnit_Enumerated);
-            values[5].SetIntValue(100, eCSSUnit_Enumerated);
-            break;
-          case BG_LEFT:
-            values[4].SetIntValue(0, eCSSUnit_Enumerated);
-            values[5].SetIntValue(50, eCSSUnit_Enumerated);
-            break;
-          case BG_RIGHT:
-            values[4].SetIntValue(100, eCSSUnit_Enumerated);
-            values[5].SetIntValue(50, eCSSUnit_Enumerated);
-            break;
-        }
-      }
-      else if (eCSSUnit_Inherit == values[4].GetUnit()) {
-        values[5].SetInheritValue();
-      }
-      else if (eCSSUnit_Initial == values[4].GetUnit()) {
-        values[5].SetInitialValue();
       }
       else {
         values[5].SetPercentValue(0.5f);
@@ -4499,9 +4498,9 @@ PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
     else { // both x & y values
       nsCSSUnit xUnit = values[4].GetUnit();
       nsCSSUnit yUnit = values[5].GetUnit();
-      if (eCSSUnit_Enumerated == xUnit) { // if one is enumerated, both must be
+      if (eCSSUnit_Enumerated == xUnit) {
+        PRInt32 xValue = values[4].GetIntValue();
         if (eCSSUnit_Enumerated == yUnit) {
-          PRInt32 xValue = values[4].GetIntValue();
           PRInt32 yValue = values[5].GetIntValue();
           if (0 != (xValue & (BG_LEFT | BG_RIGHT)) &&  // x is really an x value
               0 != (yValue & (BG_LEFT | BG_RIGHT))) {  // y is also an x value
@@ -4517,40 +4516,27 @@ PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
             xValue = yValue;
             yValue = holdXValue;
           }
-          switch (xValue) {
+          NS_ASSERTION(xValue & BG_CLR, "bad x value");
-            case BG_LEFT:
+          NS_ASSERTION(yValue & BG_CTB, "bad y value");
-              values[4].SetIntValue(0, eCSSUnit_Enumerated);
+          values[4] = BackgroundPositionMaskToCSSValue(xValue, PR_TRUE);
-              break;
+          values[5] = BackgroundPositionMaskToCSSValue(yValue, PR_FALSE);
-            case BG_CENTER:
-              values[4].SetIntValue(50, eCSSUnit_Enumerated);
-              break;
-            case BG_RIGHT:
-              values[4].SetIntValue(100, eCSSUnit_Enumerated);
-              break;
-            default:
-              NS_ERROR("bad x value");
-          }
-          switch (yValue) {
-            case BG_TOP:
-              values[5].SetIntValue(0, eCSSUnit_Enumerated);
-              break;
-            case BG_CENTER:
-              values[5].SetIntValue(50, eCSSUnit_Enumerated);
-              break;
-            case BG_BOTTOM:
-              values[5].SetIntValue(100, eCSSUnit_Enumerated);
-              break;
-            default:
-              NS_ERROR("bad y value");
-          }
         }
         else {
-          return PR_FALSE;
+          if (!(xValue & BG_CLR)) {
+            // The first keyword can only be 'center', 'left', or 'right'
+            return PR_FALSE;
+          }
+          values[4] = BackgroundPositionMaskToCSSValue(xValue, PR_TRUE);
         }
       }
       else {
         if (eCSSUnit_Enumerated == yUnit) {
-          return PR_FALSE;
+          PRInt32 yValue = values[5].GetIntValue();
+          if (!(yValue & BG_CTB)) {
+            // The second keyword can only be 'center', 'top', or 'bottom'
+            return PR_FALSE;
+          }
+          values[5] = BackgroundPositionMaskToCSSValue(yValue, PR_FALSE);
         }
       }
     }
@@ -4598,8 +4584,8 @@ PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
 
 PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
 {
-  // First try a number or a length value
+  // First try a percentage or a length value
-  nsCSSValue  xValue;
+  nsCSSValue xValue, yValue;
   if (ParseVariant(aErrorCode, xValue, VARIANT_HLP, nsnull)) {
     if (eCSSUnit_Inherit == xValue.GetUnit() ||
         eCSSUnit_Initial == xValue.GetUnit()) {  // both are inherited or both are set to initial
@@ -4610,8 +4596,8 @@ PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
       }
       return PR_FALSE;
     }
-    // We have one number/length. Get the optional second number/length.
+    // We have one percentage/length. Get the optional second
-    nsCSSValue yValue;
+    // percentage/length/keyword.
     if (ParseVariant(aErrorCode, yValue, VARIANT_LP, nsnull)) {
       // We have two numbers
       if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
@@ -4622,8 +4608,23 @@ PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
       return PR_FALSE;
     }
 
-    // We have one number which is the x position. Create an value for
+    if (ParseEnum(aErrorCode, yValue, kBackgroundXYPositionKTable)) {
-    // the vertical position which is of value 50%
+      PRInt32 yVal = yValue.GetIntValue();
+      if (!(yVal & BG_CTB)) {
+        // The second keyword can only be 'center', 'top', or 'bottom'
+        return PR_FALSE;
+      }
+      if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
+        yValue = BackgroundPositionMaskToCSSValue(yVal, PR_FALSE);
+        AppendValue(eCSSProperty_background_x_position, xValue);
+        AppendValue(eCSSProperty_background_y_position, yValue);
+        return PR_TRUE;
+      }
+      return PR_FALSE;
+    }
+
+    // If only one percentage or length value is given, it sets the
+    // horizontal position only, and the vertical position will be 50%.
     if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
       AppendValue(eCSSProperty_background_x_position, xValue);
       AppendValue(eCSSProperty_background_y_position, nsCSSValue(0.5f, eCSSUnit_Percent));
@@ -4639,22 +4640,34 @@ PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
   // any duplicate keywords other than center. We try to get two
   // keywords but it's okay if there is only one.
   PRInt32 mask = 0;
-  PRInt32 centerBit = BG_CENTER1;
+  if (ParseEnum(aErrorCode, xValue, kBackgroundXYPositionKTable)) {
-  for (PRInt32 i = 0; i < 2; i++) {
-    if (PR_FALSE == ParseEnum(aErrorCode, xValue, kBackgroundXYPositionKTable)) {
-      break;
-    }
     PRInt32 bit = xValue.GetIntValue();
-    if (BG_CENTER == bit) {
-      // Special hack for center bits: We can have two of them
-      mask |= centerBit;
-      centerBit <<= 1;
-      continue;
-    } else if ((mask & bit) != 0) {
-      // no duplicate values allowed (other than center)
-      return PR_FALSE;
-    }
     mask |= bit;
+    if (ParseEnum(aErrorCode, xValue, kBackgroundXYPositionKTable)) {
+      bit = xValue.GetIntValue();
+      if (mask & (bit & ~BG_CENTER)) {
+        // Only the 'center' keyword can be duplicated.
+        return PR_FALSE;
+      }
+      mask |= bit;
+    }
+    else {
+      // Only one keyword.  See if we have a length or percentage.
+      if (ParseVariant(aErrorCode, yValue, VARIANT_LP, nsnull)) {
+        if (!(mask & BG_CLR)) {
+          // The first keyword can only be 'center', 'left', or 'right'
+          return PR_FALSE;
+        }
+
+        if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
+          xValue = BackgroundPositionMaskToCSSValue(mask, PR_TRUE);
+          AppendValue(eCSSProperty_background_x_position, xValue);
+          AppendValue(eCSSProperty_background_y_position, yValue);
+          return PR_TRUE;
+        }
+        return PR_FALSE;
+      }
+    }
   }
 
   // Check for bad input. Bad input consists of no matching keywords,
@@ -4664,22 +4677,12 @@ PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
     return PR_FALSE;
   }
 
-  // Map good input
-  PRInt32 xEnumValue = 50;
-  if ((mask & (BG_LEFT | BG_RIGHT)) != 0) {
-    // We have an x value
-    xEnumValue = ((mask & BG_LEFT) != 0) ? 0 : 100;
-  }
-  PRInt32 yEnumValue = 50;
-  if ((mask & (BG_TOP | BG_BOTTOM)) != 0) {
-    // We have a y value
-    yEnumValue = ((mask & BG_TOP) != 0) ? 0 : 100;
-  }
-
   if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
     // Create style values
-    AppendValue(eCSSProperty_background_x_position, nsCSSValue(xEnumValue, eCSSUnit_Enumerated));
+    xValue = BackgroundPositionMaskToCSSValue(mask, PR_TRUE);
-    AppendValue(eCSSProperty_background_y_position, nsCSSValue(yEnumValue, eCSSUnit_Enumerated));
+    yValue = BackgroundPositionMaskToCSSValue(mask, PR_FALSE);
+    AppendValue(eCSSProperty_background_x_position, xValue);
+    AppendValue(eCSSProperty_background_y_position, yValue);
     return PR_TRUE;
   }
   return PR_FALSE;

layout/style/nsCSSParser.cpp

@@ -3976,8 +3976,8 @@ PRBool CSSParserImpl::ParseProperty(nsresult& aErrorCode,
 #define BG_BOTTOM  0x04
 #define BG_LEFT    0x08
 #define BG_RIGHT   0x10
-#define BG_CENTER1 0x20
+#define BG_CTB    (BG_CENTER | BG_TOP | BG_BOTTOM)
-#define BG_CENTER2 0x40
+#define BG_CLR    (BG_CENTER | BG_LEFT | BG_RIGHT)
 
 // Note: Don't change this table unless you update
 // parseBackgroundPosition!
@@ -4442,6 +4442,30 @@ PRBool CSSParserImpl::ParseAzimuth(nsresult& aErrorCode, nsCSSValue& aValue)
   return PR_FALSE;
 }
 
+static nsCSSValue
+BackgroundPositionMaskToCSSValue(PRInt32 aMask, PRBool isX)
+{
+  PRInt32 pct = 50;
+  if (isX) {
+    if (aMask & BG_LEFT) {
+      pct = 0;
+    }
+    else if (aMask & BG_RIGHT) {
+      pct = 100;
+    }
+  }
+  else {
+    if (aMask & BG_TOP) {
+      pct = 0;
+    }
+    else if (aMask & BG_BOTTOM) {
+      pct = 100;
+    }
+  }
+
+  return nsCSSValue(pct, eCSSUnit_Enumerated);
+}
+
 PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
 {
   const PRInt32 numProps = 6;
@@ -4461,36 +4485,11 @@ PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
   }
 
   if (0 != (found & 0x30)) {  // found one or more position values, validate them
-    if (0 == (found & 0x20)) {  // x value only
+    if (0 == (found & 0x20)) {
       if (eCSSUnit_Enumerated == values[4].GetUnit()) {
-        switch (values[4].GetIntValue()) {
+        PRInt32 mask = values[4].GetIntValue();
-          case BG_CENTER:
+        values[4] = BackgroundPositionMaskToCSSValue(mask, PR_TRUE);
-            values[4].SetIntValue(50, eCSSUnit_Enumerated);
+        values[5] = BackgroundPositionMaskToCSSValue(mask, PR_FALSE);
-            values[5].SetIntValue(50, eCSSUnit_Enumerated);
-            break;
-          case BG_TOP:
-            values[4].SetIntValue(50, eCSSUnit_Enumerated);
-            values[5].SetIntValue(0, eCSSUnit_Enumerated);
-            break;
-          case BG_BOTTOM:
-            values[4].SetIntValue(50, eCSSUnit_Enumerated);
-            values[5].SetIntValue(100, eCSSUnit_Enumerated);
-            break;
-          case BG_LEFT:
-            values[4].SetIntValue(0, eCSSUnit_Enumerated);
-            values[5].SetIntValue(50, eCSSUnit_Enumerated);
-            break;
-          case BG_RIGHT:
-            values[4].SetIntValue(100, eCSSUnit_Enumerated);
-            values[5].SetIntValue(50, eCSSUnit_Enumerated);
-            break;
-        }
-      }
-      else if (eCSSUnit_Inherit == values[4].GetUnit()) {
-        values[5].SetInheritValue();
-      }
-      else if (eCSSUnit_Initial == values[4].GetUnit()) {
-        values[5].SetInitialValue();
       }
       else {
         values[5].SetPercentValue(0.5f);
@@ -4499,9 +4498,9 @@ PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
     else { // both x & y values
       nsCSSUnit xUnit = values[4].GetUnit();
       nsCSSUnit yUnit = values[5].GetUnit();
-      if (eCSSUnit_Enumerated == xUnit) { // if one is enumerated, both must be
+      if (eCSSUnit_Enumerated == xUnit) {
+        PRInt32 xValue = values[4].GetIntValue();
         if (eCSSUnit_Enumerated == yUnit) {
-          PRInt32 xValue = values[4].GetIntValue();
           PRInt32 yValue = values[5].GetIntValue();
           if (0 != (xValue & (BG_LEFT | BG_RIGHT)) &&  // x is really an x value
               0 != (yValue & (BG_LEFT | BG_RIGHT))) {  // y is also an x value
@@ -4517,40 +4516,27 @@ PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
             xValue = yValue;
             yValue = holdXValue;
           }
-          switch (xValue) {
+          NS_ASSERTION(xValue & BG_CLR, "bad x value");
-            case BG_LEFT:
+          NS_ASSERTION(yValue & BG_CTB, "bad y value");
-              values[4].SetIntValue(0, eCSSUnit_Enumerated);
+          values[4] = BackgroundPositionMaskToCSSValue(xValue, PR_TRUE);
-              break;
+          values[5] = BackgroundPositionMaskToCSSValue(yValue, PR_FALSE);
-            case BG_CENTER:
-              values[4].SetIntValue(50, eCSSUnit_Enumerated);
-              break;
-            case BG_RIGHT:
-              values[4].SetIntValue(100, eCSSUnit_Enumerated);
-              break;
-            default:
-              NS_ERROR("bad x value");
-          }
-          switch (yValue) {
-            case BG_TOP:
-              values[5].SetIntValue(0, eCSSUnit_Enumerated);
-              break;
-            case BG_CENTER:
-              values[5].SetIntValue(50, eCSSUnit_Enumerated);
-              break;
-            case BG_BOTTOM:
-              values[5].SetIntValue(100, eCSSUnit_Enumerated);
-              break;
-            default:
-              NS_ERROR("bad y value");
-          }
         }
         else {
-          return PR_FALSE;
+          if (!(xValue & BG_CLR)) {
+            // The first keyword can only be 'center', 'left', or 'right'
+            return PR_FALSE;
+          }
+          values[4] = BackgroundPositionMaskToCSSValue(xValue, PR_TRUE);
         }
       }
       else {
         if (eCSSUnit_Enumerated == yUnit) {
-          return PR_FALSE;
+          PRInt32 yValue = values[5].GetIntValue();
+          if (!(yValue & BG_CTB)) {
+            // The second keyword can only be 'center', 'top', or 'bottom'
+            return PR_FALSE;
+          }
+          values[5] = BackgroundPositionMaskToCSSValue(yValue, PR_FALSE);
         }
       }
     }
@@ -4598,8 +4584,8 @@ PRBool CSSParserImpl::ParseBackground(nsresult& aErrorCode)
 
 PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
 {
-  // First try a number or a length value
+  // First try a percentage or a length value
-  nsCSSValue  xValue;
+  nsCSSValue xValue, yValue;
   if (ParseVariant(aErrorCode, xValue, VARIANT_HLP, nsnull)) {
     if (eCSSUnit_Inherit == xValue.GetUnit() ||
         eCSSUnit_Initial == xValue.GetUnit()) {  // both are inherited or both are set to initial
@@ -4610,8 +4596,8 @@ PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
       }
       return PR_FALSE;
     }
-    // We have one number/length. Get the optional second number/length.
+    // We have one percentage/length. Get the optional second
-    nsCSSValue yValue;
+    // percentage/length/keyword.
     if (ParseVariant(aErrorCode, yValue, VARIANT_LP, nsnull)) {
       // We have two numbers
       if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
@@ -4622,8 +4608,23 @@ PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
       return PR_FALSE;
     }
 
-    // We have one number which is the x position. Create an value for
+    if (ParseEnum(aErrorCode, yValue, kBackgroundXYPositionKTable)) {
-    // the vertical position which is of value 50%
+      PRInt32 yVal = yValue.GetIntValue();
+      if (!(yVal & BG_CTB)) {
+        // The second keyword can only be 'center', 'top', or 'bottom'
+        return PR_FALSE;
+      }
+      if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
+        yValue = BackgroundPositionMaskToCSSValue(yVal, PR_FALSE);
+        AppendValue(eCSSProperty_background_x_position, xValue);
+        AppendValue(eCSSProperty_background_y_position, yValue);
+        return PR_TRUE;
+      }
+      return PR_FALSE;
+    }
+
+    // If only one percentage or length value is given, it sets the
+    // horizontal position only, and the vertical position will be 50%.
     if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
       AppendValue(eCSSProperty_background_x_position, xValue);
       AppendValue(eCSSProperty_background_y_position, nsCSSValue(0.5f, eCSSUnit_Percent));
@@ -4639,22 +4640,34 @@ PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
   // any duplicate keywords other than center. We try to get two
   // keywords but it's okay if there is only one.
   PRInt32 mask = 0;
-  PRInt32 centerBit = BG_CENTER1;
+  if (ParseEnum(aErrorCode, xValue, kBackgroundXYPositionKTable)) {
-  for (PRInt32 i = 0; i < 2; i++) {
-    if (PR_FALSE == ParseEnum(aErrorCode, xValue, kBackgroundXYPositionKTable)) {
-      break;
-    }
     PRInt32 bit = xValue.GetIntValue();
-    if (BG_CENTER == bit) {
-      // Special hack for center bits: We can have two of them
-      mask |= centerBit;
-      centerBit <<= 1;
-      continue;
-    } else if ((mask & bit) != 0) {
-      // no duplicate values allowed (other than center)
-      return PR_FALSE;
-    }
     mask |= bit;
+    if (ParseEnum(aErrorCode, xValue, kBackgroundXYPositionKTable)) {
+      bit = xValue.GetIntValue();
+      if (mask & (bit & ~BG_CENTER)) {
+        // Only the 'center' keyword can be duplicated.
+        return PR_FALSE;
+      }
+      mask |= bit;
+    }
+    else {
+      // Only one keyword.  See if we have a length or percentage.
+      if (ParseVariant(aErrorCode, yValue, VARIANT_LP, nsnull)) {
+        if (!(mask & BG_CLR)) {
+          // The first keyword can only be 'center', 'left', or 'right'
+          return PR_FALSE;
+        }
+
+        if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
+          xValue = BackgroundPositionMaskToCSSValue(mask, PR_TRUE);
+          AppendValue(eCSSProperty_background_x_position, xValue);
+          AppendValue(eCSSProperty_background_y_position, yValue);
+          return PR_TRUE;
+        }
+        return PR_FALSE;
+      }
+    }
   }
 
   // Check for bad input. Bad input consists of no matching keywords,
@@ -4664,22 +4677,12 @@ PRBool CSSParserImpl::ParseBackgroundPosition(nsresult& aErrorCode)
     return PR_FALSE;
   }
 
-  // Map good input
-  PRInt32 xEnumValue = 50;
-  if ((mask & (BG_LEFT | BG_RIGHT)) != 0) {
-    // We have an x value
-    xEnumValue = ((mask & BG_LEFT) != 0) ? 0 : 100;
-  }
-  PRInt32 yEnumValue = 50;
-  if ((mask & (BG_TOP | BG_BOTTOM)) != 0) {
-    // We have a y value
-    yEnumValue = ((mask & BG_TOP) != 0) ? 0 : 100;
-  }
-
   if (ExpectEndProperty(aErrorCode, PR_TRUE)) {
     // Create style values
-    AppendValue(eCSSProperty_background_x_position, nsCSSValue(xEnumValue, eCSSUnit_Enumerated));
+    xValue = BackgroundPositionMaskToCSSValue(mask, PR_TRUE);
-    AppendValue(eCSSProperty_background_y_position, nsCSSValue(yEnumValue, eCSSUnit_Enumerated));
+    yValue = BackgroundPositionMaskToCSSValue(mask, PR_FALSE);
+    AppendValue(eCSSProperty_background_x_position, xValue);
+    AppendValue(eCSSProperty_background_y_position, yValue);
     return PR_TRUE;
   }
   return PR_FALSE;