org.opencypher.v9_0.expressions.OperatorExpression.scala Maven / Gradle / Ivy

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/*
 * Copyright (c) Neo4j Sweden AB (http://neo4j.com)
 *
 * 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 org.opencypher.v9_0.expressions

trait OperatorExpression {
  self: Expression =>

  def signatures: Seq[ExpressionTypeSignature] = Seq.empty

  def canonicalOperatorSymbol: String = self.productPrefix.toUpperCase
}

trait LeftUnaryOperatorExpression extends OperatorExpression {
  self: Expression =>

  def rhs: Expression

  override def asCanonicalStringVal: String = s"$canonicalOperatorSymbol(${rhs.asCanonicalStringVal})"
}

trait RightUnaryOperatorExpression extends OperatorExpression {
  self: Expression =>

  def lhs: Expression
  override def asCanonicalStringVal: String = s"$canonicalOperatorSymbol(${lhs.asCanonicalStringVal})"
}

trait BinaryOperatorExpression extends OperatorExpression {
  self: Expression =>

  def lhs: Expression
  def rhs: Expression

  override def asCanonicalStringVal: String = {
    s"${lhs.asCanonicalStringVal} $canonicalOperatorSymbol ${rhs.asCanonicalStringVal}"
  }
}

/**
 * An expression that can be chained, like for example `1 < x < 5`.
 */
trait ChainableBinaryOperatorExpression extends BinaryOperatorExpression {
  self: Expression =>
}

trait MultiOperatorExpression  extends OperatorExpression {
  self: Expression =>

  def exprs: Seq[Expression]

  override def asCanonicalStringVal: String = s"$canonicalOperatorSymbol( ${exprs.map(_.asCanonicalStringVal).mkString(", ")}"
}