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• rojoma-json-v3_2.10
• 3.15.0
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• LowPriorityImplicits.scala

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com.rojoma.json.v3.-impl.matcher.LowPriorityImplicits.scala Maven / Gradle / Ivy

package com.rojoma.json.v3
package `-impl`.matcher

import scala.language.implicitConversions

import matcher._
import codec._
import ast.JValue

class LowPriorityImplicits {
  /** Converts an object with a [[com.rojoma.json.v3.codec.JsonDecode]] into a
   * [[com.rojoma.json.v3.matcher.Pattern]] which matches a value only
   * if the codec can decode it into something which is `equal` to the
   * object. */
  implicit def litifyDecode[T : JsonDecode](lit: T): Pattern =
    new Pattern {
      def evaluate(x: JValue, environment: Pattern.Results): Either[DecodeError, Pattern.Results] =
        JsonDecode[T].decode(x) match {
          case Right(y) if lit == y => Right(environment)
          case Right(_) => Left(DecodeError.InvalidValue(x))
          case Left(err) => Left(err)
        }

      def generate(environment: Pattern.Results): Option[JValue] = None
    }
}