zio.logging.internal.JsonEscape.scala Maven / Gradle / Ivy

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/*
 * Copyright 2019-2024 John A. De Goes and the ZIO Contributors
 *
 * 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 zio.logging.internal

import scala.annotation.switch

object JsonEscape {
  def apply(s: CharSequence): CharSequence = {
    val sb  = new java.lang.StringBuilder
    var i   = 0
    val len = s.length
    while (i < len) {
      (s.charAt(i): @switch) match {
        case '"'  => sb.append("\\\"")
        case '\\' => sb.append("\\\\")
        case '\b' => sb.append("\\b")
        case '\f' => sb.append("\\f")
        case '\n' => sb.append("\\n")
        case '\r' => sb.append("\\r")
        case '\t' => sb.append("\\t")
        case c    =>
          if (c < ' ') sb.append("\\u%04x".format(c.toInt))
          else sb.append(c)
      }
      i += 1
    }
    sb
  }
}