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LuaDouble: handle negative zero, negative NaN

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This commit is contained in:
asie
2019-08-11 11:47:51 +02:00
parent c1834733c1
commit af4cfe5e00
1 changed files with 13 additions and 11 deletions
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20
src/core/org/luaj/vm2/LuaDouble.java
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@@ -33,8 +33,8 @@ import org.luaj.vm2.lib.MathLib;
* <p>
* Almost all API's implemented in LuaDouble are defined and documented in {@link LuaValue}.
* <p>
* However the constants {@link #NAN}, {@link #POSINF}, {@link #NEGINF},
* {@link #JSTR_NAN}, {@link #JSTR_POSINF}, and {@link #JSTR_NEGINF} may be useful
* However the constants {@link #NAN}, {@link #NEGNAN}, {@link #POSINF}, {@link #NEGINF},
* {@link #JSTR_NAN}, {@link #JSTR_NEGNAN}, {@link #JSTR_POSINF}, and {@link #JSTR_NEGINF} may be useful
* when dealing with Nan or Infinite values.
* <p>
* LuaDouble also defines functions for handling the unique math rules of lua devision and modulo in
@@ -56,6 +56,9 @@ public class LuaDouble extends LuaNumber {
/** Constant LuaDouble representing NaN (not a number) */
public static final LuaDouble NAN = new LuaDouble( Double.NaN );
/** Constant LuaDouble representing negative NaN (not a number) */
public static final LuaDouble NEGNAN = new LuaDouble( -Double.NaN );
/** Constant LuaDouble representing positive infinity */
public static final LuaDouble POSINF = new LuaDouble( Double.POSITIVE_INFINITY );
@@ -65,6 +68,9 @@ public class LuaDouble extends LuaNumber {
/** Constant String representation for NaN (not a number), "nan" */
public static final String JSTR_NAN = "nan";
/** Constant String representation for negative NaN (not a number), "-nan" */
public static final String JSTR_NEGNAN = "-nan";
/** Constant String representation for positive infinity, "inf" */
public static final String JSTR_POSINF = "inf";
@@ -235,17 +241,13 @@ public class LuaDouble extends LuaNumber {
public int strcmp( LuaString rhs ) { typerror("attempt to compare number with string"); return 0; }
public String tojstring() {
/*
if ( v == 0.0 ) { // never occurs in J2me
long bits = Double.doubleToLongBits( v );
return ( bits >> 63 == 0 ) ? "0" : "-0";
}
*/
if ( v == 0.0 ) // never occurs on J2ME
return (Double.doubleToRawLongBits(v)<0? "-0": "0");
long l = (long) v;
if ( l == v )
return Long.toString(l);
if ( Double.isNaN(v) )
return JSTR_NAN;
return (Double.doubleToRawLongBits(v)<0? JSTR_NEGNAN: JSTR_NAN);
if ( Double.isInfinite(v) )
return (v<0? JSTR_NEGINF: JSTR_POSINF);
return Float.toString((float)v);