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Rhino JavaScript runtime jar, excludes tools & JSR-223 Script Engine wrapper.
/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript;
import java.math.BigInteger;
import java.util.Arrays;
/** This class implements the BigInt native object. */
final class NativeBigInt extends IdScriptableObject {
private static final long serialVersionUID = 1335609231306775449L;
private static final Object BIG_INT_TAG = "BigInt";
static void init(Scriptable scope, boolean sealed) {
NativeBigInt obj = new NativeBigInt(BigInteger.ZERO);
obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
}
NativeBigInt(BigInteger bigInt) {
bigIntValue = bigInt;
}
@Override
public String getClassName() {
return "BigInt";
}
@Override
protected void fillConstructorProperties(IdFunctionObject ctor) {
addIdFunctionProperty(ctor, BIG_INT_TAG, ConstructorId_asIntN, "asIntN", 2);
addIdFunctionProperty(ctor, BIG_INT_TAG, ConstructorId_asUintN, "asUintN", 2);
super.fillConstructorProperties(ctor);
}
@Override
protected void initPrototypeId(int id) {
if (id == SymbolId_toStringTag) {
initPrototypeValue(
SymbolId_toStringTag,
SymbolKey.TO_STRING_TAG,
getClassName(),
DONTENUM | READONLY);
return;
}
String s;
int arity;
switch (id) {
case Id_constructor:
arity = 1;
s = "constructor";
break;
case Id_toString:
arity = 0;
s = "toString";
break;
case Id_toLocaleString:
arity = 0;
s = "toLocaleString";
break;
case Id_toSource:
arity = 0;
s = "toSource";
break;
case Id_valueOf:
arity = 0;
s = "valueOf";
break;
default:
throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(BIG_INT_TAG, id, s, arity);
}
@Override
public Object execIdCall(
IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
if (!f.hasTag(BIG_INT_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
if (id == Id_constructor) {
if (thisObj == null) {
// new BigInt(val) throws TypeError.
throw ScriptRuntime.typeErrorById("msg.not.ctor", BIG_INT_TAG);
}
BigInteger val = (args.length >= 1) ? ScriptRuntime.toBigInt(args[0]) : BigInteger.ZERO;
// BigInt(val) converts val to a BigInteger value.
return val;
} else if (id < Id_constructor) {
return execConstructorCall(id, args);
}
// The rest of BigInt.prototype methods require thisObj to be BigInt
BigInteger value = ensureType(thisObj, NativeBigInt.class, f).bigIntValue;
switch (id) {
case Id_toString:
case Id_toLocaleString:
{
// toLocaleString is just an alias for toString for now
int base =
(args.length == 0 || args[0] == Undefined.instance)
? 10
: ScriptRuntime.toInt32(args[0]);
return ScriptRuntime.bigIntToString(value, base);
}
case Id_toSource:
return "(new BigInt(" + ScriptRuntime.toString(value) + "))";
case Id_valueOf:
return value;
default:
throw new IllegalArgumentException(String.valueOf(id));
}
}
private static Object execConstructorCall(int id, Object[] args) {
switch (id) {
case ConstructorId_asIntN:
case ConstructorId_asUintN:
{
int bits =
ScriptRuntime.toIndex(args.length < 1 ? Undefined.instance : args[0]);
BigInteger bigInt =
ScriptRuntime.toBigInt(args.length < 2 ? Undefined.instance : args[1]);
if (bits == 0) {
return BigInteger.ZERO;
}
byte[] bytes = bigInt.toByteArray();
int newBytesLen = (bits / Byte.SIZE) + 1;
if (newBytesLen > bytes.length) {
return bigInt;
}
byte[] newBytes =
Arrays.copyOfRange(bytes, bytes.length - newBytesLen, bytes.length);
int mod = bits % Byte.SIZE;
switch (id) {
case ConstructorId_asIntN:
if (mod == 0) {
newBytes[0] = newBytes[1] < 0 ? (byte) -1 : 0;
} else if ((newBytes[0] & (1 << (mod - 1))) != 0) {
newBytes[0] |= -1 << mod;
} else {
newBytes[0] &= (1 << mod) - 1;
}
break;
case ConstructorId_asUintN:
newBytes[0] &= (1 << mod) - 1;
break;
}
return new BigInteger(newBytes);
}
default:
throw new IllegalArgumentException(String.valueOf(id));
}
}
@Override
public String toString() {
return ScriptRuntime.bigIntToString(bigIntValue, 10);
}
@Override
protected int findPrototypeId(Symbol k) {
if (SymbolKey.TO_STRING_TAG.equals(k)) {
return SymbolId_toStringTag;
}
return 0;
}
@Override
protected int findPrototypeId(String s) {
int id;
switch (s) {
case "constructor":
id = Id_constructor;
break;
case "toString":
id = Id_toString;
break;
case "toLocaleString":
id = Id_toLocaleString;
break;
case "toSource":
id = Id_toSource;
break;
case "valueOf":
id = Id_valueOf;
break;
default:
id = 0;
break;
}
return id;
}
private static final int ConstructorId_asIntN = -1,
ConstructorId_asUintN = -2,
Id_constructor = 1,
Id_toString = 2,
Id_toLocaleString = 3,
Id_toSource = 4,
Id_valueOf = 5,
SymbolId_toStringTag = 6,
MAX_PROTOTYPE_ID = SymbolId_toStringTag;
private BigInteger bigIntValue;
}