wvlet.airframe.json.JSONEventHandler.scala Maven / Gradle / Ivy

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JSON parser

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/*
 * 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 wvlet.airframe.json

trait JSONHandler[Expr] {
  def singleContext(s: JSONSource, start: Int): JSONContext[Expr]
  def objectContext(s: JSONSource, start: Int): JSONContext[Expr]
  def arrayContext(s: JSONSource, start: Int): JSONContext[Expr]
}

/**
  * A facade to build json ASTs while scanning json with JSONScanner
  * @tparam Expr
  */
trait JSONContext[Expr] extends JSONHandler[Expr] {
  def result: Expr
  def isObjectContext: Boolean
  private[json] final def endScannerState: Int = {
    if (isObjectContext) JSONScanner.OBJECT_END
    else JSONScanner.ARRAY_END
  }

  def add(v: Expr): Unit
  def closeContext(s: JSONSource, end: Int): Unit

  def addNull(s: JSONSource, start: Int, end: Int): Unit
  def addString(s: JSONSource, start: Int, end: Int): Unit
  def addUnescapedString(s: String): Unit
  def addNumber(s: JSONSource, start: Int, end: Int, dotIndex: Int, expIndex: Int): Unit
  def addBoolean(s: JSONSource, v: Boolean, start: Int, end: Int): Unit
}