IDEA-115034 (Good code red: hex float zero)

java/java-psi-api/src/com/intellij/psi/util/TypeConversionUtil.java

@@ -1460,12 +1460,16 @@ public class TypeConversionUtil {
     return null;
   }
 
-  // true if floating point literal consists of zeros only
+  /**
+   * See JLS 3.10.2. Floating-Point Literals
+   * @return true  if floating point literal consists of zeros only
+   */
   public static boolean isFPZero(@NotNull final String text) {
     for (int i = 0; i < text.length(); i++) {
       final char c = text.charAt(i);
       if (Character.isDigit(c) && c != '0') return false;
-      if (Character.toUpperCase(c) == 'E') break;
+      final char d = Character.toUpperCase(c);
+      if (d == 'E' || d == 'P') break;
     }
     return true;
   }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/advHighlighting7/NumericLiterals.java

@@ -33,6 +33,7 @@ public class NumericLiterals {
     float f10 = 0xa_bc.d_efP0F;
     float f11= <error descr="Floating point number too small">1e-4__6f</error>;
     float f12 = <error descr="Floating point number too large">1e3_9f</error>;
+    float f13 = 0x0.0p1f;
 
     double d1 = 0_0d;
     double d2 = 1e1_1;
@@ -48,5 +49,6 @@ public class NumericLiterals {
     double d12 = <error descr="Floating point number too large">0xa_bc.de_fP1_234D</error>;
     double d13 = <error descr="Illegal underscore">0x1.0_p-1</error>;
     double d14 = <error descr="Illegal underscore">1.0e_1022</error>;
+    double d15 = 0x.0P2d;
   }
 }