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A parser for Tom's Obvious, Minimal Language (TOML).
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/*
 * Copyright 2018 ConsenSys AG.
 *
 * 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 net.consensys.cava.toml;

import static java.util.Objects.requireNonNull;
import static net.consensys.cava.toml.TomlType.typeFor;

import java.io.IOException;
import java.util.Collections;
import java.util.Iterator;
import java.util.Optional;

final class JsonSerializer {
  private JsonSerializer() {}

  static void toJson(TomlTable table, Appendable appendable) throws IOException {
    requireNonNull(table);
    requireNonNull(appendable);
    toJson(table, appendable, 0);
    appendable.append(System.lineSeparator());
  }

  private static void toJson(TomlTable table, Appendable appendable, int indent) throws IOException {
    if (table.isEmpty()) {
      appendable.append("{}");
      return;
    }
    appendLine(appendable, "{");
    for (Iterator iterator = table.keySet().stream().sorted().iterator(); iterator.hasNext();) {
      String key = iterator.next();
      append(appendable, indent + 2, "\"" + escape(key) + "\" : ");
      Object value = table.get(Collections.singletonList(key));
      assert value != null;
      appendTomlValue(value, appendable, indent);
      if (iterator.hasNext()) {
        appendable.append(",");
        appendable.append(System.lineSeparator());
      }
    }
    appendable.append(System.lineSeparator());
    append(appendable, indent, "}");
  }

  static void toJson(TomlArray array, Appendable appendable) throws IOException {
    toJson(array, appendable, 0);
    appendable.append(System.lineSeparator());
  }

  private static void toJson(TomlArray array, Appendable appendable, int indent) throws IOException {
    if (array.isEmpty()) {
      appendable.append("[]");
      return;
    }
    if (array.containsTables()) {
      append(appendable, 0, "[");
      for (Iterator