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/*******************************************************************************
* Copyright (c) 2009 Luaj.org. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
******************************************************************************/
package org.luaj.vm2;
import org.luaj.vm2.lib.MathLib;
/**
* Extension of {@link LuaNumber} which can hold a Java int as its value.
*
* These instance are not instantiated directly by clients, but indirectly
* via the static functions {@link LuaValue#valueOf(int)} or {@link LuaValue#valueOf(double)}
* functions. This ensures that policies regarding pooling of instances are
* encapsulated.
*
* There are no API's specific to LuaInteger that are useful beyond what is already
* exposed in {@link LuaValue}.
*
* @see LuaValue
* @see LuaNumber
* @see LuaDouble
* @see LuaValue#valueOf(int)
* @see LuaValue#valueOf(double)
*/
public class LuaInteger extends LuaNumber {
private static final LuaInteger[] intValues = new LuaInteger[512];
static {
for ( int i=0; i<512; i++ )
intValues[i] = new LuaInteger(i-256);
}
public static LuaInteger valueOf(int i) {
return i<=255 && i>=-256? intValues[i+256]: new LuaInteger(i);
};
// TODO consider moving this to LuaValue
/** Return a LuaNumber that represents the value provided
* @param l long value to represent.
* @return LuaNumber that is eithe LuaInteger or LuaDouble representing l
* @see LuaValue#valueOf(int)
* @see LuaValue#valueOf(double)
*/
public static LuaNumber valueOf(long l) {
int i = (int) l;
return l==i? (i<=255 && i>=-256? intValues[i+256]:
(LuaNumber) new LuaInteger(i)):
(LuaNumber) LuaDouble.valueOf(l);
}
/** The value being held by this instance. */
public final int v;
/**
* Package protected constructor.
* @see LuaValue#valueOf(int)
**/
LuaInteger(int i) {
this.v = i;
}
public boolean isint() { return true; }
public boolean isinttype() { return true; }
public boolean islong() { return true; }
public byte tobyte() { return (byte) v; }
public char tochar() { return (char) v; }
public double todouble() { return v; }
public float tofloat() { return v; }
public int toint() { return v; }
public long tolong() { return v; }
public short toshort() { return (short) v; }
public double optdouble(double defval) { return v; }
public int optint(int defval) { return v; }
public LuaInteger optinteger(LuaInteger defval) { return this; }
public long optlong(long defval) { return v; }
public String tojstring() {
return Integer.toString(v);
}
public LuaString strvalue() {
return LuaString.valueOf(Integer.toString(v));
}
public LuaString optstring(LuaString defval) {
return LuaString.valueOf(Integer.toString(v));
}
public LuaValue tostring() {
return LuaString.valueOf(Integer.toString(v));
}
public String optjstring(String defval) {
return Integer.toString(v);
}
public LuaInteger checkinteger() {
return this;
}
public boolean isstring() {
return true;
}
public int hashCode() {
return v;
}
public static int hashCode(int x) {
return x;
}
// unary operators
public LuaValue neg() { return valueOf(-(long)v); }
// object equality, used for key comparison
public boolean equals(Object o) { return o instanceof LuaInteger? ((LuaInteger)o).v == v: false; }
// equality w/ metatable processing
public LuaValue eq( LuaValue val ) { return val.raweq(v)? TRUE: FALSE; }
public boolean eq_b( LuaValue val ) { return val.raweq(v); }
// equality w/o metatable processing
public boolean raweq( LuaValue val ) { return val.raweq(v); }
public boolean raweq( double val ) { return v == val; }
public boolean raweq( int val ) { return v == val; }
// arithmetic operators
public LuaValue add( LuaValue rhs ) { return rhs.add(v); }
public LuaValue add( double lhs ) { return LuaDouble.valueOf(lhs + v); }
public LuaValue add( int lhs ) { return LuaInteger.valueOf(lhs + (long)v); }
public LuaValue sub( LuaValue rhs ) { return rhs.subFrom(v); }
public LuaValue sub( double rhs ) { return LuaDouble.valueOf(v - rhs); }
public LuaValue sub( int rhs ) { return LuaDouble.valueOf(v - rhs); }
public LuaValue subFrom( double lhs ) { return LuaDouble.valueOf(lhs - v); }
public LuaValue subFrom( int lhs ) { return LuaInteger.valueOf(lhs - (long)v); }
public LuaValue mul( LuaValue rhs ) { return rhs.mul(v); }
public LuaValue mul( double lhs ) { return LuaDouble.valueOf(lhs * v); }
public LuaValue mul( int lhs ) { return LuaInteger.valueOf(lhs * (long)v); }
public LuaValue pow( LuaValue rhs ) { return rhs.powWith(v); }
public LuaValue pow( double rhs ) { return MathLib.dpow(v,rhs); }
public LuaValue pow( int rhs ) { return MathLib.dpow(v,rhs); }
public LuaValue powWith( double lhs ) { return MathLib.dpow(lhs,v); }
public LuaValue powWith( int lhs ) { return MathLib.dpow(lhs,v); }
public LuaValue div( LuaValue rhs ) { return rhs.divInto(v); }
public LuaValue div( double rhs ) { return LuaDouble.ddiv(v,rhs); }
public LuaValue div( int rhs ) { return LuaDouble.ddiv(v,rhs); }
public LuaValue divInto( double lhs ) { return LuaDouble.ddiv(lhs,v); }
public LuaValue mod( LuaValue rhs ) { return rhs.modFrom(v); }
public LuaValue mod( double rhs ) { return LuaDouble.dmod(v,rhs); }
public LuaValue mod( int rhs ) { return LuaDouble.dmod(v,rhs); }
public LuaValue modFrom( double lhs ) { return LuaDouble.dmod(lhs,v); }
// relational operators
public LuaValue lt( LuaValue rhs ) { return rhs.gt_b(v)? TRUE: FALSE; }
public LuaValue lt( double rhs ) { return v < rhs? TRUE: FALSE; }
public LuaValue lt( int rhs ) { return v < rhs? TRUE: FALSE; }
public boolean lt_b( LuaValue rhs ) { return rhs.gt_b(v); }
public boolean lt_b( int rhs ) { return v < rhs; }
public boolean lt_b( double rhs ) { return v < rhs; }
public LuaValue lteq( LuaValue rhs ) { return rhs.gteq_b(v)? TRUE: FALSE; }
public LuaValue lteq( double rhs ) { return v <= rhs? TRUE: FALSE; }
public LuaValue lteq( int rhs ) { return v <= rhs? TRUE: FALSE; }
public boolean lteq_b( LuaValue rhs ) { return rhs.gteq_b(v); }
public boolean lteq_b( int rhs ) { return v <= rhs; }
public boolean lteq_b( double rhs ) { return v <= rhs; }
public LuaValue gt( LuaValue rhs ) { return rhs.lt_b(v)? TRUE: FALSE; }
public LuaValue gt( double rhs ) { return v > rhs? TRUE: FALSE; }
public LuaValue gt( int rhs ) { return v > rhs? TRUE: FALSE; }
public boolean gt_b( LuaValue rhs ) { return rhs.lt_b(v); }
public boolean gt_b( int rhs ) { return v > rhs; }
public boolean gt_b( double rhs ) { return v > rhs; }
public LuaValue gteq( LuaValue rhs ) { return rhs.lteq_b(v)? TRUE: FALSE; }
public LuaValue gteq( double rhs ) { return v >= rhs? TRUE: FALSE; }
public LuaValue gteq( int rhs ) { return v >= rhs? TRUE: FALSE; }
public boolean gteq_b( LuaValue rhs ) { return rhs.lteq_b(v); }
public boolean gteq_b( int rhs ) { return v >= rhs; }
public boolean gteq_b( double rhs ) { return v >= rhs; }
// string comparison
public int strcmp( LuaString rhs ) { typerror("attempt to compare number with string"); return 0; }
public int checkint() {
return v;
}
public long checklong() {
return v;
}
public double checkdouble() {
return v;
}
public String checkjstring() {
return String.valueOf(v);
}
public LuaString checkstring() {
return valueOf( String.valueOf(v) );
}
}