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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.slime;
import com.yahoo.io.AbstractByteWriter;
import com.yahoo.io.ByteWriter;
import com.yahoo.text.AbstractUtf8Array;
import com.yahoo.text.Utf8;
import com.yahoo.text.Utf8String;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UncheckedIOException;
import static ai.vespa.validation.Validation.requireInRange;
import static java.nio.charset.StandardCharsets.UTF_8;
/**
* Encodes json from a slime object.
*
* @author Ulf Lilleengen
*/
public final class JsonFormat implements SlimeFormat {
private final static byte [] HEX = Utf8.toBytes("0123456789ABCDEF");
private final int indent;
public JsonFormat(int indent) {
this.indent = requireInRange(indent, "JSON space indent count", 0, 8);
}
public JsonFormat(boolean compact) {
this(compact ? 0 : 2);
}
@Override
public void encode(OutputStream os, Slime slime) throws IOException {
new Encoder(slime.get(), os, indent).encode();
}
public void encode(OutputStream os, Inspector value) throws IOException {
new Encoder(value, os, indent).encode();
}
public void encode(AbstractByteWriter os, Slime slime) throws IOException {
new Encoder(slime.get(), os, indent).encode();
}
public void encode(AbstractByteWriter os, Inspector value) throws IOException {
new Encoder(value, os, indent).encode();
}
/** Returns the given slime data as UTF-8-encoded JSON */
public static byte[] toJsonBytes(Slime slime) {
try {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
new JsonFormat(true).encode(baos, slime);
return baos.toByteArray();
}
catch (IOException e) {
throw new UncheckedIOException(e);
}
}
/** Returns the given UTF-8-encoded JSON as a Slime object */
public static Slime jsonToSlime(byte[] json) {
Slime slime = new Slime();
new JsonDecoder().decode(slime, json);
return slime;
}
static final class Encoder implements ArrayTraverser, ObjectTraverser {
private final Inspector top;
private final AbstractByteWriter out;
private final byte[] indent;
private boolean head = true;
private int level = 0;
final static AbstractUtf8Array NULL=new Utf8String("null");
final static AbstractUtf8Array FALSE=new Utf8String("false");
final static AbstractUtf8Array TRUE=new Utf8String("true");
public Encoder(Inspector value, OutputStream out, int indent) {
this(value, new ByteWriter(out), indent);
}
public Encoder(Inspector value, AbstractByteWriter out, int indent) {
this.top = value;
this.out = out;
this.indent = indent == 0 ? null : " ".repeat(indent).getBytes(UTF_8);
}
public void encode() throws IOException {
encodeValue(top);
if (indent != null) {
out.append((byte) '\n');
}
out.flush();
}
private void encodeNIX() throws IOException {
out.write(NULL);
}
private void encodeBOOL(boolean value) throws IOException {
out.write(value ? TRUE : FALSE);
}
private void encodeLONG(long value) throws IOException {
out.write(value);
}
private void encodeDOUBLE(double value) throws IOException {
if (Double.isFinite(value)) {
out.write(String.valueOf(value));
} else {
out.write(NULL);
}
}
private void encodeSTRING(byte[] value) throws IOException {
byte [] data = new byte[value.length * 6 + 2];
int len = 2;
int p = 0;
data[p++] = '"';
for (int pos = 0; pos < value.length; pos++) {
byte c = value[pos];
switch (c) {
case '"': data[p++] = '\\'; data[p++] = '"'; len += 2; break;
case '\\': data[p++] = '\\'; data[p++] = '\\'; len += 2; break;
case '\b': data[p++] = '\\'; data[p++] = 'b'; len += 2; break;
case '\f': data[p++] = '\\'; data[p++] = 'f'; len += 2; break;
case '\n': data[p++] = '\\'; data[p++] = 'n'; len += 2; break;
case '\r': data[p++] = '\\'; data[p++] = 'r'; len += 2; break;
case '\t': data[p++] = '\\'; data[p++] = 't'; len += 2; break;
default:
if (c > 0x1f || c < 0) {
data[p++] = c;
len++;
} else { // requires escaping according to RFC 4627
data[p++] = '\\'; data[p++] = 'u'; data[p++] = '0'; data[p++] = '0';
data[p++] = HEX[(c >> 4) & 0xf]; data[p++] = HEX[c & 0xf];
len += 6;
}
}
}
data[p] = '"';
out.append(data, 0, len);
}
private void encodeDATA(byte[] value) throws IOException {
int len = value.length * 2 + 4;
byte [] data = new byte[len];
int p = 0;
data[p++] = '"'; data[p++] = '0'; data[p++] = 'x';
for (int pos = 0; pos < value.length; pos++) {
data[p++] = HEX[(value[pos] >> 4) & 0xf]; data[p++] = HEX[value[pos] & 0xf];
}
data[p] = '"';
out.append(data, 0, len);
}
private void encodeARRAY(Inspector inspector) throws IOException {
openScope((byte)'[');
ArrayTraverser at = this;
inspector.traverse(at);
closeScope((byte)']');
}
private void encodeOBJECT(Inspector inspector) throws IOException {
openScope((byte)'{');
ObjectTraverser ot = this;
inspector.traverse(ot);
closeScope((byte) '}');
}
private void openScope(byte opener) throws IOException {
out.append(opener);
level++;
head = true;
}
private void closeScope(byte closer) throws IOException {
level--;
separate(false);
out.append(closer);
}
private void encodeValue(Inspector inspector) throws IOException {
switch(inspector.type()) {
case NIX: encodeNIX(); return;
case BOOL: encodeBOOL(inspector.asBool()); return;
case LONG: encodeLONG(inspector.asLong()); return;
case DOUBLE: encodeDOUBLE(inspector.asDouble()); return;
case STRING: encodeSTRING(inspector.asUtf8()); return;
case DATA: encodeDATA(inspector.asData()); return;
case ARRAY: encodeARRAY(inspector); return;
case OBJECT: encodeOBJECT(inspector); return;
}
assert false : "Should not be reached";
}
private void separate(boolean useComma) throws IOException {
boolean newline = ! head || useComma;
if ( ! head && useComma) {
out.append((byte)',');
} else {
head = false;
}
if (indent != null) {
if (newline) {
out.append((byte) '\n');
for (int lvl = 0; lvl < level; lvl++) { out.append(indent); }
} else {
out.append((byte) ' ');
}
}
}
public void entry(int idx, Inspector inspector) {
try {
separate(true);
encodeValue(inspector);
} catch (Exception e) {
// FIXME: Should we fix ArrayTraverser/ObjectTraverser API or do something more fancy here?
e.printStackTrace();
}
}
public void field(String name, Inspector inspector) {
try {
separate(true);
encodeSTRING(Utf8Codec.encode(name));
out.append((byte)':');
if (indent != null)
out.append((byte) ' ');
encodeValue(inspector);
} catch (Exception e) {
// FIXME: Should we fix ArrayTraverser/ObjectTraverser API or do something more fancy here?
e.printStackTrace();
}
}
}
}
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