<commit_before>/*
 * Copyright 2012-2022 the original author or authors.
 *
 * 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
 *
 *      https://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 org.springframework.boot.json;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * Really basic JSON parser for when you have nothing else available. Comes with some
 * limitations with respect to the JSON specification (e.g. only supports String values),
 * so users will probably prefer to have a library handle things instead (Jackson or Snake
 * YAML are supported).
 *
 * @author <NAME>
 * @author <NAME>
 * @author <NAME>
 * @since 1.2.0
 * @see JsonParserFactory
 */
public class BasicJsonParser extends AbstractJsonParser {

	private static final int MAX_DEPTH = 1000;

	@Override
	public Map<String, Object> parseMap(String json) {
		return tryParse(() -> parseMap(json, this::parseMapInternal), Exception.class);
	}

	@Override
	public List<Object> parseList(String json) {
		return tryParse(() -> parseList(json, (jsonToParse) -> parseListInternal(0, jsonToParse)), Exception.class);
	}

	private List<Object> parseListInternal(int nesting, String json) {
		List<Object> list = new ArrayList<>();
		json = trimLeadingCharacter(trimTrailingCharacter(json, ']'), '[').trim();
		for (String value : tokenize(json)) {
			list.add(parseInternal(nesting + 1, value));
		}
		return list;
	}

	private Object parseInternal(int nesting, String json) {
		if (nesting > MAX_DEPTH) {
			throw new IllegalStateException("JSON is too deeply nested");
		}
		if (json.startsWith("[")) {
			return parseListInternal(nesting + 1, json);
		}
		if (json.startsWith("{")) {
			return parseMapInternal(json);
		}
		if (json.startsWith("\"")) {
			return trimTrailingCharacter(trimLeadingCharacter(json, '"'), '"');
		}
		try {
			return Long.valueOf(json);
		}
		catch (NumberFormatException ex) {
			// ignore
		}
		try {
			return Double.valueOf(json);
		}
		catch (NumberFormatException ex) {
			// ignore
		}
		return json;
	}

	private Map<String, Object> parseMapInternal(String json) {
		Map<String, Object> map = new LinkedHashMap<>();
		json = trimLeadingCharacter(trimTrailingCharacter(json, '}'), '{').trim();
		for (String pair : tokenize(json)) {
			String[] values = StringUtils.trimArrayElements(StringUtils.split(pair, ":"));
			Assert.state(values[0].startsWith("\"") && values[0].endsWith("\""),
					"Expecting double-quotes around field names");
			String key = trimLeadingCharacter(trimTrailingCharacter(values[0], '"'), '"');
			Object value = parseInternal(0, values[1]);
			map.put(key, value);
		}
		return map;
	}

	private static String trimTrailingCharacter(String string, char c) {
		if (!string.isEmpty() && string.charAt(string.length() - 1) == c) {<commit_msg>Protect against deeply nested JSON maps<commit_after>/*
 * Copyright 2012-2022 the original author or authors.
 *
 * 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
 *
 *      https://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 org.springframework.boot.json;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.springframework.util.Assert;
import org.springframework.util.StringUtils;

/**
 * Really basic JSON parser for when you have nothing else available. Comes with some
 * limitations with respect to the JSON specification (e.g. only supports String values),
 * so users will probably prefer to have a library handle things instead (Jackson or Snake
 * YAML are supported).
 *
 * @author <NAME>
 * @author <NAME>
 * @author <NAME>
 * @since 1.2.0
 * @see JsonParserFactory
 */
public class BasicJsonParser extends AbstractJsonParser {

	private static final int MAX_DEPTH = 1000;

	@Override
	public Map<String, Object> parseMap(String json) {
		return tryParse(() -> parseMap(json, (jsonToParse) -> parseMapInternal(0, jsonToParse)), Exception.class);
	}

	@Override
	public List<Object> parseList(String json) {
		return tryParse(() -> parseList(json, (jsonToParse) -> parseListInternal(0, jsonToParse)), Exception.class);
	}

	private List<Object> parseListInternal(int nesting, String json) {
		List<Object> list = new ArrayList<>();
		json = trimLeadingCharacter(trimTrailingCharacter(json, ']'), '[').trim();
		for (String value : tokenize(json)) {
			list.add(parseInternal(nesting + 1, value));
		}
		return list;
	}

	private Object parseInternal(int nesting, String json) {
		if (nesting > MAX_DEPTH) {
			throw new IllegalStateException("JSON is too deeply nested");
		}
		if (json.startsWith("[")) {
			return parseListInternal(nesting + 1, json);
		}
		if (json.startsWith("{")) {
			return parseMapInternal(nesting, json);
		}
		if (json.startsWith("\"")) {
			return trimTrailingCharacter(trimLeadingCharacter(json, '"'), '"');
		}
		try {
			return Long.valueOf(json);
		}
		catch (NumberFormatException ex) {
			// ignore
		}
		try {
			return Double.valueOf(json);
		}
		catch (NumberFormatException ex) {
			// ignore
		}
		return json;
	}

	private Map<String, Object> parseMapInternal(int nesting, String json) {
		Map<String, Object> map = new LinkedHashMap<>();
		json = trimLeadingCharacter(trimTrailingCharacter(json, '}'), '{').trim();
		for (String pair : tokenize(json)) {
			String[] values = StringUtils.trimArrayElements(StringUtils.split(pair, ":"));
			Assert.state(values[0].startsWith("\"") && values[0].endsWith("\""),
					"Expecting double-quotes around field names");
			String key = trimLeadingCharacter(trimTrailingCharacter(values[0], '"'), '"');
			Object value = parseInternal(nesting, values[1]);
			map.put(key, value);
		}
		return map;
	}

	private static String trimTrailingCharacter(String string, char c) {
		if (!string.isEmpty() && string.charAt(string.length() - 1) == c) {
{'fraction_non_alphanumeric': 0.12721417069243157, 'fraction_numerical': 0.008197921241399501, 'mean_word_length': 4.392265193370166, 'pattern_counts': {'":': 2, '<': 25, '<?xml version=': 0, '>': 34, 'https://': 2, 'lorem ipsum': 0, 'www.': 2, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '5112005', 'n_tokens_mistral': 2169, 'n_tokens_neox': 1987, 'n_words': 622}