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JsonString.java
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267 lines (230 loc) · 6.4 KB
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/*******************************************************************************
* Copyright 2024 See AUTHORS file.
*
* 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 com.badlogic.gdx.utils;
import java.math.BigDecimal;
import java.math.BigInteger;
import com.badlogic.gdx.utils.JsonWriter.OutputType;
/** Builder API for emitting JSON to a string.
* @author Nathan Sweet */
public class JsonString {
static private final int none = 0, needsComma = 1, object = '}' << 1, array = ']' << 1, isObject = 0b1000000;
final StringBuilder buffer;
private final IntArray stack = new IntArray();
private int current;
private boolean named;
private OutputType outputType = OutputType.json;
private boolean quoteLongValues;
public JsonString () {
this(64);
}
public JsonString (int initialBufferSize) {
buffer = new StringBuilder(initialBufferSize);
}
public StringBuilder getBuffer () {
return buffer;
}
/** Sets the type of JSON output. Default is {@link OutputType#minimal}. */
public void setOutputType (OutputType outputType) {
this.outputType = outputType;
}
/** When true, long, double, BigInteger, BigDecimal types are output as strings to prevent truncation in languages like
* JavaScript and PHP. This is not necessary when using libgdx, which handles these types without truncation. Default is
* false. */
public void setQuoteLongValues (boolean quoteLongValues) {
this.quoteLongValues = quoteLongValues;
}
public JsonString object () {
requireCommaOrName();
buffer.append('{');
stack.add(current);
current = object;
return this;
}
public JsonString array () {
requireCommaOrName();
buffer.append('[');
stack.add(current);
current = array;
return this;
}
/** Prefer calling the more specific value() methods. */
public JsonString value (@Null Object value) {
if (quoteLongValues
&& (value instanceof Long || value instanceof Double || value instanceof BigDecimal || value instanceof BigInteger)) {
value = value.toString();
} else if (value instanceof Number) {
Number number = (Number)value;
long longValue = number.longValue();
if (number.doubleValue() == longValue) value = longValue;
}
requireCommaOrName();
buffer.append(outputType.quoteValue(value));
return this;
}
public JsonString value (String value) {
requireCommaOrName();
buffer.append(outputType.quoteValue(value));
return this;
}
public JsonString value (boolean value) {
requireCommaOrName();
buffer.append(value);
return this;
}
public JsonString value (int value) {
requireCommaOrName();
buffer.append(value);
return this;
}
public JsonString value (long value) {
if (quoteLongValues)
value(Long.toString(value));
else {
requireCommaOrName();
buffer.append(value);
}
return this;
}
public JsonString value (float value) {
requireCommaOrName();
buffer.append(value);
return this;
}
public JsonString value (double value) {
if (quoteLongValues)
value(Double.toString(value));
else {
requireCommaOrName();
buffer.append(value);
}
return this;
}
/** Writes the specified JSON string, without quoting or escaping. */
public JsonString json (String json) {
requireCommaOrName();
buffer.append(json);
return this;
}
private void requireCommaOrName () {
if ((current & isObject) != 0) {
if (!named) throw new IllegalStateException("Name must be set.");
named = false;
} else {
if ((current & needsComma) != 0)
buffer.append(',');
else if (current != none) //
current |= needsComma;
}
}
public JsonString name (String name) {
nameValue(name);
named = true;
return this;
}
private void nameValue (String name) {
if ((current & isObject) == 0) throw new IllegalStateException("Current item must be an object.");
if ((current & needsComma) != 0)
buffer.append(',');
else
current |= needsComma;
buffer.append(outputType.quoteName(name));
buffer.append(':');
}
public JsonString object (String name) {
nameValue(name);
buffer.append('{');
stack.add(current);
current = object;
return this;
}
public JsonString array (String name) {
nameValue(name);
buffer.append('[');
stack.add(current);
current = array;
return this;
}
/** Prefer calling the more specific set() methods. */
public JsonString set (String name, Object value) {
name(name);
value(value);
return this;
}
public JsonString set (String name, String value) {
nameValue(name);
buffer.append(outputType.quoteValue(value));
return this;
}
public JsonString set (String name, boolean value) {
nameValue(name);
buffer.append(value);
return this;
}
public JsonString set (String name, int value) {
nameValue(name);
buffer.append(value);
return this;
}
public JsonString set (String name, long value) {
if (quoteLongValues)
set(name, Long.toString(value));
else {
nameValue(name);
buffer.append(value);
}
return this;
}
public JsonString set (String name, float value) {
nameValue(name);
buffer.append(value);
return this;
}
public JsonString set (String name, double value) {
if (quoteLongValues)
set(name, Double.toString(value));
else {
nameValue(name);
buffer.append(value);
}
return this;
}
/** Writes the specified JSON string, without quoting or escaping. */
public JsonString json (String name, String json) {
nameValue(name);
buffer.append(json);
return this;
}
public JsonString pop () {
if (named) throw new IllegalStateException("Expected an object, array, or value since a name was set.");
buffer.append((char)(current >> 1));
current = stack.size == 0 ? none : stack.items[--stack.size];
return this;
}
public JsonString close () {
while (stack.size > 0)
pop();
return this;
}
public void reset () {
buffer.setLength(0);
stack.size = 0;
current = none;
named = false;
}
public String toString () {
return buffer.toString();
}
}