/
ErlConvert.java
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/
ErlConvert.java
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/**
* This file is part of Erjang - A JVM-based Erlang VM
*
* Copyright (c) 2009 by Trifork
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
package erjang.m.erlang;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import erjang.BIF;
import erjang.EBinary;
import erjang.EBitString;
import erjang.ECons;
import erjang.EInputStream;
import erjang.EObject;
import erjang.EProc;
import erjang.ERT;
import erjang.ESeq;
import erjang.ESmall;
import erjang.EString;
import erjang.ETuple;
import erjang.ErlangError;
import erjang.NotImplemented;
/**
*
*/
public class ErlConvert {
@BIF
public static EObject binary_to_term(EObject arg) {
EBinary bin;
if ((bin=arg.testBinary()) == null) throw ERT.badarg(arg);
EInputStream in = bin.getInputStream();
try {
EObject val = in.read_any();
//System.out.println("DECODED:"+val);
return val;
} catch (IOException e) {
throw new ErlangError(ERT.am_badarg, e, arg);
}
}
@BIF
public static EBitString term_to_binary(EObject bin) {
throw new NotImplemented();
}
@BIF
public static ETuple list_to_tuple(EObject obj) {
ESeq seq;
if ((seq = obj.testSeq()) == null)
throw ERT.badarg(obj);
return ETuple.make(seq.toArray());
}
@BIF
public static EString binary_to_list(EObject obj) {
EBinary bin = obj.testBinary();
if (bin == null)
throw ERT.badarg(obj);
return EString.fromBinary(bin);
}
static private class BARR extends ByteArrayOutputStream {
EBinary asBinary() {
return new EBinary(super.buf, 0, super.count);
}
}
@BIF
public static EBinary iolist_to_binary(EObject list) {
ECons iol = list.testCons();
if (iol == null)
throw ERT.badarg(list);
if (iol.isNil()) {
return EBinary.EMPTY;
}
BARR barr = new BARR();
iol = collectList(list, iol, barr);
return barr.asBinary();
}
private static ECons collectList(EObject list, ECons iol, BARR barr) {
while (true) {
EObject hd = iol.head();
ESmall sm;
EBinary bi;
ECons co;
if ((sm = hd.testSmall()) != null) {
if (sm.value < 0 || sm.value > 255)
throw ERT.badarg(list);
barr.write(sm.value);
} else if ((bi = hd.testBinary()) != null) {
bi.writeTo(barr);
} else if ((co = hd.testNonEmptyList()) != null) {
collectList(list, co, barr);
} else {
throw ERT.badarg(list);
}
EObject next = iol.tail();
if (next.isNil()) {
break;
} else if ((sm = next.testSmall()) != null && sm.value==(sm.value&0xff)) {
barr.write(sm.value);
} else if ((iol = next.testCons()) != null) {
continue;
} else if ((bi = next.testBinary()) != null) {
bi.writeTo(barr);
break;
} else {
throw ERT.badarg(list);
}
}
return iol;
}
@BIF
public static EObject tuple_to_list(EObject tup) {
ETuple t;
if ((t=tup.testTuple()) == null) { throw ERT.badarg(tup); }
ESeq res = ERT.NIL;
for (int i = t.arity(); i > 0; i--) {
res = res.cons(t.elm(i));
}
return res;
}
}