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cn.nukkit.nbt.SNBTParser Maven / Gradle / Ivy
package cn.nukkit.nbt;
import cn.nukkit.nbt.tag.*;
import lombok.NonNull;
public class SNBTParser {
private final String snbt;
private int index = 0;
SNBTParser(@NonNull String snbt) {
this.snbt = snbt.replace(" ", "").replace("\n", "");
}
public CompoundTag deserializationSNBT() {
String key = getKey();
return parsingCompound(key);
}
private CompoundTag parsingCompound(String compoundKey) {
if (compoundKey == null) compoundKey = "";
var result = new CompoundTag(compoundKey);
//每次循环读取一个key:value;
do {
if (snbt.charAt(index) == '}') {
next(1);
break;
}
//index移动到'"'才能调用使用getKey
if (snbt.charAt(index) != '"') {
next(1);
continue;
}
//使用后index到达':',或者进入无key Compound递归
String key = getKey();
if (key == null) result.putCompound("", parsingCompound(""));
//获取':'后第一个字符
char type = peek(1);
eval(type);
//判断value类型
if (type == '{') result.putCompound(key, parsingCompound(key));
else if (type == '[') {//只字节数组或者List,List中元素类型必须相同
if (snbt.charAt(index + 1) == 'B') {
int start = index + 3;
int end = snbt.indexOf("]", start);
var value = snbt
.substring(start, end)
.replace("b", "")
.split(",");
var byteArray = new byte[value.length];
for (int i = 0; i < value.length; ++i) {
byteArray[i] = Byte.parseByte(value[i]);
}
result.putByteArray(key, byteArray);
next(end - index + 1);//index前往']'后一个位置
} else {
result.putList(parsingList(key));
}
} else if (type >= '0' && type <= '9' || type == '-') {
StringBuilder str = new StringBuilder();
while (snbt.charAt(index) != ',' && snbt.charAt(index) != '}') {
str.append(snbt.charAt(index));
next(1);//index直到','或者'}'
}
result.put(key, getNumber(key, str.toString()));
} else if (type == '\"') {
int start = index + 1;
int end = snbt.indexOf("\"", start);
var value = snbt.substring(start, end);
result.put(key, new StringTag(key, value));
next(end - index + 1);//index前往'"'后一个位置
} else if (type == ',' || type == '}') {
result.put(key, new EndTag());
}
} while (index <= snbt.length());
return result;
}
private ListTag parsingList(String listKey) {
ListTag result = new ListTag<>(listKey);
//每次循环读取一个key:value;
do {
char charAtIndex = snbt.charAt(index);
if (charAtIndex == ']') break;
//获取'[' ',' 后第一个字符
char type = charAtIndex;
if (charAtIndex == ',' || charAtIndex == '[') type = peek(1);
eval(type);
//判断value类型
if (type == '{') {
result.add(parsingCompound(""));
} else if (type == '[') {//只字节数组或者List,List中元素类型必须相同
if (snbt.charAt(index + 1) == 'B') {
int start = index + 3;
int end = snbt.indexOf("]", start);
var value = snbt
.substring(start, end)
.replace("b", "")
.split(",");
var byteArray = new byte[value.length];
for (int i = 0; i < value.length; ++i) {
byteArray[i] = Byte.parseByte(value[i]);
}
result.add(new ByteArrayTag("", byteArray));
next(end - index + 1);//index前往']'后一个位置
} else {
result.add(parsingList(""));
next(1);//index到达','或者']'
}
} else if (type >= '0' && type <= '9' || type == '-') {
int start = index;
int end = snbt.indexOf("]", start);
var value = snbt
.substring(start, end)
.split(",");
for (var tag : value) {
result.add(getNumber("", tag));
}
next(end - start);
} else if (type == '\"') {
int start = index;
int end = snbt.indexOf("]", start);
var value = snbt
.substring(start, end)
.split(",");
for (var tag : value) {
result.add(new StringTag("", tag.replace("\"", "")));
}
next(end - start);
} else if (type == ',' || type == ']') {
int start = index;
int end = snbt.indexOf("]", start);
if (type == ']') {
result.add(new EndTag());
} else {
var len = snbt.substring(start, end).length() + 1;
for (int i = 0; i < len; ++i) {
result.add(new EndTag());
}
}
next(end - start);
}
} while (index <= snbt.length());
return result;
}
private void next(int num) {
if (index + num > snbt.length()) throw new IndexOutOfBoundsException("snbt索引越界");
index += num;
}
private char peek(int num) {
if (index + num > snbt.length()) throw new IndexOutOfBoundsException("snbt索引越界");
index += num;
return snbt.charAt(index);
}
private String getKey() {
if (snbt.charAt(index) == '\"') {
int start = index + 1;
int end = snbt.indexOf("\"", start);
//index进入':'
if (peek(end - index + 1) != ':') throw new IllegalArgumentException("snbt格式错误");
return snbt.substring(start, end);
} else if (snbt.charAt(index) == '{') {//为'{'意味着当前是无key Compound
next(1);
return null;
}
return null;
}
private Tag getNumber(String key, String value) {
if (value.indexOf('L') != -1) {
long num = Long.parseLong(value.replace("L", ""));
return new LongTag(key, num);
} else if (value.indexOf('s') != -1) {
short num = Short.parseShort(value.replace("s", ""));
return new ShortTag(key, num);
} else if (value.indexOf('b') != -1) {
byte num = Byte.parseByte(value.replace("b", ""));
return new ByteTag(key, num);
} else if (value.indexOf('d') != -1) {
double num = Double.parseDouble(value.replace("d", ""));
return new DoubleTag(key, num);
} else if (value.indexOf('f') != -1) {
float num = Float.parseFloat(value.replace("f", ""));
return new FloatTag(key, num);
} else if (value.indexOf('i') != -1) {
int num = Integer.parseInt(value.replace("i", ""));
return new IntTag(key, num);
} else {
int num = Integer.parseInt(value);
return new IntTag(key, num);
}
}
private void eval(char type) {
if (!((type >= '0' && type <= '9') || type == ',' || type == '[' || type == '{'
|| type == ']' || type == '\"' || type == '}' || type == '-')) {
throw new IllegalArgumentException("snbt格式错误");
}
}
public void reset() {
index = 0;
}
public static CompoundTag parseSNBT(String SNBT) {
SNBTParser parser = new SNBTParser(SNBT);
return parser.deserializationSNBT();
}
}
