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Fixity.scala
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Fixity.scala
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/* SPDX-FileCopyrightText: © 2021 Parsley Contributors <https://github.com/j-mie6/Parsley/graphs/contributors>
* SPDX-License-Identifier: BSD-3-Clause
*/
package parsley.expr
import parsley.Parsley
/**
* Denotes the fixity and associativity of an operator. Importantly, it also specifies the type of the
* of the operations themselves.
* @since 4.0.0
* @group Fixities
*/
sealed trait Fixity {
type Op[A, B]
private [expr] def chain[A, B](p: Parsley[A], op: Parsley[Op[A, B]])(implicit wrap: A => B): Parsley[B]
}
/**
* Describes left-associative binary operators
* @since 4.0.0
* @group Fixities
*/
case object InfixL extends Fixity {
override type Op[-A, B] = (B, A) => B
private [expr] def chain[A, B](p: Parsley[A], op: Parsley[Op[A, B]])(implicit wrap: A => B): Parsley[B] = infix.left1(p, op)
}
/**
* Describes right-associative binary operators
* @since 4.0.0
* @group Fixities
*/
case object InfixR extends Fixity {
override type Op[-A, B] = (A, B) => B
private [expr] def chain[A, B](p: Parsley[A], op: Parsley[Op[A, B]])(implicit wrap: A => B): Parsley[B] = infix.right1(p, op)
}
/**
* Describes unary prefix operators
* @since 4.0.0
* @group Fixities
*/
case object Prefix extends Fixity {
override type Op[A, B] = B => B
private [expr] def chain[A, B](p: Parsley[A], op: Parsley[Op[A, B]])(implicit wrap: A => B): Parsley[B] = infix.prefix(op, p)
}
/**
* Describes unary postfix operators
* @since 4.0.0
* @group Fixities
*/
case object Postfix extends Fixity {
override type Op[A, B] = B => B
private [expr] def chain[A, B](p: Parsley[A], op: Parsley[Op[A, B]])(implicit wrap: A => B): Parsley[B] = infix.postfix(p, op)
}
/**
* Describes non-associative operators
* @since 4.0.0
* @group Fixities
*/
case object InfixN extends Fixity {
override type Op[-A, +B] = (A, A) => B
private [expr] def chain[A, B](p: Parsley[A], op: Parsley[Op[A, B]])(implicit wrap: A => B): Parsley[B] = infix.nonassoc(p, op)
}