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del OldJSONParser
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Looly
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/*
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* Copyright (c) 2013-2024 Hutool Team and hutool.cn
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.dromara.hutool.json.reader;
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import org.dromara.hutool.core.lang.mutable.Mutable;
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import org.dromara.hutool.core.lang.mutable.MutableEntry;
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import org.dromara.hutool.core.text.CharUtil;
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import org.dromara.hutool.json.*;
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import java.util.function.Predicate;
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/**
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* JSON字符串解析器，实现：
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* <ul>
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* <li>JSON字符串 --> {@link JSONTokener} --> {@link JSONObject}</li>
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* <li>JSON字符串 --> {@link JSONTokener} --> {@link JSONArray}</li>
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* </ul>
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*
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* @author looly
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* @since 5.8.0
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*/
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public class OldJSONParser {
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/**
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* 创建JSONParser
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*
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* @param tokener {@link JSONTokener}
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* @param config JSON配置
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* @return JSONParser
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*/
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public static OldJSONParser of(final JSONTokener tokener, final JSONConfig config) {
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return new OldJSONParser(tokener, config);
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}
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/**
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* JSON配置
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*/
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private final JSONConfig config;
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private final JSONTokener tokener;
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/**
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* 构造
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*
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* @param tokener {@link JSONTokener}
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* @param config JSON配置
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*/
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public OldJSONParser(final JSONTokener tokener, final JSONConfig config) {
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this.tokener = tokener;
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this.config = config;
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}
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/**
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* 获取{@link JSONTokener}
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*
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* @return {@link JSONTokener}
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*/
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public JSONTokener getTokener() {
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return this.tokener;
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}
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/**
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* 是否结束
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*
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* @return 是否结束
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*/
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public boolean end() {
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return this.tokener.end();
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}
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// region parseTo
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/**
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* 解析{@link JSONTokener}中的字符到目标的{@link JSONObject}中
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*
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* @param jsonObject {@link JSONObject}
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* @param predicate 键值对过滤编辑器，可以通过实现此接口，完成解析前对键值对的过滤和修改操作，{@code null}表示不过滤，{@link Predicate#test(Object)}为{@code true}保留
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*/
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public void parseTo(final JSONObject jsonObject, final Predicate<MutableEntry<String, Object>> predicate) {
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final JSONTokener tokener = this.tokener;
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if (tokener.nextClean() != '{') {
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throw tokener.syntaxError("A JSONObject text must begin with '{'");
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}
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char prev;
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char c;
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String key;
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while (true) {
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prev = tokener.getPrevious();
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c = tokener.nextClean();
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switch (c) {
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case 0:
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throw tokener.syntaxError("A JSONObject text must end with '}'");
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case '}':
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return;
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case '{':
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case '[':
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if (prev == '{') {
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throw tokener.syntaxError("A JSONObject can not directly nest another JSONObject or JSONArray.");
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}
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default:
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tokener.back();
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key = tokener.nextString();
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}
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// The key is followed by ':'.
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c = tokener.nextClean();
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if (c != ':') {
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throw tokener.syntaxError("Expected a ':' after a key");
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}
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jsonObject.set(key, nextValue(), null);
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// Pairs are separated by ','.
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switch (tokener.nextClean()) {
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case ';':
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case CharUtil.COMMA:
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if (tokener.nextClean() == '}') {
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// issue#2380
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// 尾后逗号（Trailing Commas），JSON中虽然不支持，但是ECMAScript 2017支持，此处做兼容。
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return;
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}
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tokener.back();
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break;
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case '}':
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return;
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default:
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throw tokener.syntaxError("Expected a ',' or '}'");
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}
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}
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}
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/**
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* 解析JSON字符串到{@link JSONArray}中
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*
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* @param jsonArray {@link JSONArray}
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* @param predicate 键值对过滤编辑器，可以通过实现此接口，完成解析前对值的过滤和修改操作，{@code null} 表示不过滤，，{@link Predicate#test(Object)}为{@code true}保留
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*/
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public void parseTo(final JSONArray jsonArray, final Predicate<Mutable<Object>> predicate) {
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final JSONTokener x = this.tokener;
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if (x.nextClean() != '[') {
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throw x.syntaxError("A JSONArray text must start with '['");
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}
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if (x.nextClean() != ']') {
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x.back();
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for (; ; ) {
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if (x.nextClean() == CharUtil.COMMA) {
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x.back();
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jsonArray.add(null, predicate);
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} else {
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x.back();
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jsonArray.add(nextValue(), predicate);
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}
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switch (x.nextClean()) {
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case CharUtil.COMMA:
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if (x.nextClean() == ']') {
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return;
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}
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x.back();
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break;
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case ']':
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return;
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default:
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throw x.syntaxError("Expected a ',' or ']'");
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}
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}
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}
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}
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// endregion
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/**
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* 获得下一个值，值类型可以是Boolean, Double, Integer, JSONArray, JSONObject, Long, or String
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*
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* @return Boolean, Double, Integer, JSONArray, JSONObject, Long, or String
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* @throws JSONException 语法错误
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*/
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public Object nextValue() throws JSONException {
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return nextValue((token, tokener, config) -> {
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switch (token) {
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case CharUtil.DELIM_START:
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try {
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return new JSONObject(this, config);
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} catch (final StackOverflowError e) {
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throw new JSONException("JSONObject depth too large to process.", e);
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}
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case CharUtil.BRACKET_START:
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try {
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return new JSONArray(this, config);
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} catch (final StackOverflowError e) {
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throw new JSONException("JSONObject depth too large to process.", e);
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}
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}
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throw new JSONException("Unsupported object build for token {}", token);
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});
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}
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/**
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* 获得下一个值，值类型可以是Boolean, Double, Integer, JSONArray, JSONObject, Long, or String
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*
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* @param objectBuilder JSON对象构建器
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* @return Boolean, Double, Integer, JSONArray, JSONObject, Long, or String
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* @throws JSONException 语法错误
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*/
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public Object nextValue(final ObjectBuilder objectBuilder) throws JSONException {
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final JSONTokener tokener = this.tokener;
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final char c = tokener.nextClean();
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switch (c) {
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case CharUtil.DOUBLE_QUOTES:
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case CharUtil.SINGLE_QUOTE:
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return tokener.nextWrapString(c);
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case CharUtil.DELIM_START:
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case CharUtil.BRACKET_START:
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tokener.back();
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return objectBuilder.build(c, tokener, this.config);
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}
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/*
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* 处理无引号包装的字符串，如： true, false, 或 null, 或 number.
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* 同样兼容非标准的字符串，如key无引号包装。
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* 此方法会不断读取并积累字符直到遇到token符
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*/
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return InternalJSONUtil.parseValueFromString(tokener.nextUnwrapString(c));
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}
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/**
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* 对象构建抽象，通过实现此接口，从{@link JSONTokener}解析值并构建指定对象
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*/
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@FunctionalInterface
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public interface ObjectBuilder {
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/**
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* 构建
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*
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* @param token 符号表示，用于区分对象类型
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* @param tokener {@link JSONTokener}
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* @param config {@link JSONConfig}
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* @return 构建的对象
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*/
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Object build(char token, JSONTokener tokener, JSONConfig config);
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}
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}
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