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Intermediate YANG parsing representation
/*
* Copyright (c) 2022 PANTHEON.tech, s.r.o. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.yangtools.yang.ir;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.opendaylight.yangtools.yang.ir.IRArgument.Concatenation;
import org.opendaylight.yangtools.yang.ir.IRArgument.Single;
import org.opendaylight.yangtools.yang.ir.IRKeyword.Qualified;
final class StatementOutputV1 extends StatementOutput {
private final Map keywords = new HashMap<>();
private final Map strings = new HashMap<>();
StatementOutputV1(final DataOutput out) {
super(out);
}
@Override
void writeStatement(final IRStatement stmt) throws IOException {
final List statements = stmt.statements();
final int size = statements.size();
final int sizeBits;
if (size == 0) {
sizeBits = IOConstantsV1.HDR_SIZE_0;
} else if (size <= 255) {
sizeBits = IOConstantsV1.HDR_SIZE_U8;
} else if (size <= 65535) {
sizeBits = IOConstantsV1.HDR_SIZE_U16;
} else {
sizeBits = IOConstantsV1.HDR_SIZE_S32;
}
final IRKeyword keyword = stmt.keyword();
final Integer keyCode = keywords.get(keyword);
final int keyBits;
if (keyCode != null) {
final int key = keyCode;
if (key <= 255) {
keyBits = IOConstantsV1.HDR_KEY_REF_U8;
} else if (size <= 65535) {
keyBits = IOConstantsV1.HDR_KEY_REF_U16;
} else {
keyBits = IOConstantsV1.HDR_KEY_REF_S32;
}
} else {
keyBits = keyword instanceof Qualified ? IOConstantsV1.HDR_KEY_DEF_QUAL : IOConstantsV1.HDR_KEY_DEF_UQUAL;
}
final IRArgument argument = stmt.argument();
switch (stmt) {
case IRStatement.Z22 z22 -> {
writeHeader(keyBits, IOConstantsV1.HDR_LOCATION_22, sizeBits, argument);
out.writeShort(stmt.startLine());
out.writeShort(stmt.startColumn());
}
case IRStatement.Z31 z31 -> {
writeHeader(keyBits, IOConstantsV1.HDR_LOCATION_31, sizeBits, argument);
out.writeInt(z31.value());
}
case IRStatement.Z44 z44 -> {
writeHeader(keyBits, IOConstantsV1.HDR_LOCATION_44, sizeBits, argument);
out.writeInt(stmt.startLine());
out.writeInt(stmt.startColumn());
}
}
switch (keyBits) {
case IOConstantsV1.HDR_KEY_REF_U8 -> out.writeByte(keyCode);
case IOConstantsV1.HDR_KEY_REF_U16 -> out.writeShort(keyCode);
case IOConstantsV1.HDR_KEY_REF_S32 -> out.writeInt(keyCode);
case IOConstantsV1.HDR_KEY_DEF_QUAL -> {
writeString(keyword.prefix());
writeString(keyword.identifier());
keywords.put(keyword, keywords.size());
}
case IOConstantsV1.HDR_KEY_DEF_UQUAL -> {
writeString(keyword.identifier());
keywords.put(keyword, keywords.size());
}
default -> throw new IllegalStateException("Unhandled key bits " + keyBits);
}
if (argument != null) {
writeArgument(argument);
}
switch (sizeBits) {
case IOConstantsV1.HDR_SIZE_0:
// All done
return;
case IOConstantsV1.HDR_SIZE_U8:
out.writeByte(statements.size());
break;
case IOConstantsV1.HDR_SIZE_U16:
out.writeShort(size);
break;
case IOConstantsV1.HDR_SIZE_S32:
out.writeInt(size);
break;
default:
throw new IllegalStateException("Unhandled size bits " + sizeBits);
}
for (var child : statements) {
writeStatement(child);
}
}
private void writeString(final String str) throws IOException {
final Integer key = strings.get(str);
if (key != null) {
writeStringRef(key);
} else {
writeStringDef(0, str);
}
}
private void writeStringDef(final int bits, final String str) throws IOException {
strings.put(str, strings.size());
final int length = str.length();
if (length <= Short.MAX_VALUE / 2) {
out.writeByte(IOConstantsV1.STR_DEF_UTF | bits);
out.writeUTF(str);
} else if (length <= 1048576) {
final byte[] bytes = str.getBytes(StandardCharsets.UTF_8);
if (bytes.length < 65536) {
out.writeByte(IOConstantsV1.STR_DEF_U16 | bits);
out.writeShort(bytes.length);
} else {
out.writeByte(IOConstantsV1.STR_DEF_S32 | bits);
out.writeInt(bytes.length);
}
out.write(bytes);
} else {
out.writeByte(IOConstantsV1.STR_DEF_CHARS | bits);
out.writeInt(length);
out.writeChars(str);
}
}
private void writeStringRef(final int strCode) throws IOException {
if (strCode <= 255) {
out.writeByte(IOConstantsV1.STR_REF_U8);
out.writeByte(strCode);
} else if (strCode <= 65535) {
out.writeByte(IOConstantsV1.STR_REF_U16);
out.writeShort(strCode);
} else {
out.writeByte(IOConstantsV1.STR_REF_S32);
out.writeInt(strCode);
}
}
private void writeHeader(final int keyBits, final int locationBits, final int sizeBits, final IRArgument argument)
throws IOException {
final int argBits = argument != null ? IOConstantsV1.HDR_ARGUMENT_PRESENT : IOConstantsV1.HDR_ARGUMENT_ABSENT;
out.writeByte(keyBits | sizeBits | argBits | locationBits);
}
private void writeArgument(final IRArgument argument) throws IOException {
switch (argument) {
case Single single -> writeArgument(single);
case Concatenation concat -> writeArgument(concat);
}
}
private void writeArgument(final Single argument) throws IOException {
final int type;
if (argument.isValidIdentifier()) {
type = IOConstantsV1.ARG_TYPE_IDENTIFIER;
} else if (argument.needQuoteCheck()) {
type = IOConstantsV1.ARG_TYPE_UQUOT;
} else if (argument.needUnescape()) {
type = IOConstantsV1.ARG_TYPE_DQUOT;
} else {
type = IOConstantsV1.ARG_TYPE_SQUOT;
}
final String str = argument.string();
final Integer existing = strings.get(str);
if (existing != null) {
final int strCode = existing;
if (strCode <= 255) {
out.writeByte(type | IOConstantsV1.STR_REF_U8);
out.writeByte(strCode);
} else if (strCode <= 65535) {
out.writeByte(type | IOConstantsV1.STR_REF_U16);
out.writeShort(strCode);
} else {
out.writeByte(type | IOConstantsV1.STR_REF_S32);
out.writeInt(strCode);
}
} else {
writeStringDef(type, str);
}
}
private void writeArgument(final Concatenation argument) throws IOException {
final var parts = argument.parts();
final int size = parts.size();
if (size <= 255) {
out.writeByte(IOConstantsV1.ARG_TYPE_CONCAT_U8);
out.writeByte(size);
} else if (size <= 65535) {
out.writeByte(IOConstantsV1.ARG_TYPE_CONCAT_U16);
out.writeShort(size);
} else {
out.writeByte(IOConstantsV1.ARG_TYPE_CONCAT_S32);
out.writeInt(size);
}
for (var part : parts) {
writeArgument(part);
}
}
}