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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.vm3;
import org.luaj.vm3.lib.MathLib;
/**
* Extension of {@link LuaNumber} which can hold a Java int as its value.
* <p>
* 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.
* <p>
* 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));
}
}