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//! Contains the [`CEffect`] type.
use crate::types::TypedVariables;
use crate::types::{ConditionalEffect, Effects, GoalDefinition, PEffect};
/// A (potentially conditional) effect. Occurs as part of [`Effects`].
///
/// ## Usage
/// Used by [`Effect`](Effects).
#[derive(Debug, Clone, PartialEq)]
pub enum CEffect {
/// A regular effect.
Effect(PEffect),
/// A universal affect that is conditioned by variables.
///
/// ## Requirements
/// Requires [Conditional Effects](crate::Requirement::ConditionalEffects).
Forall(ForallCEffect),
/// A conditional effect that applies only if a given
/// precondition holds true.
///
/// ## Requirements
/// Requires [Conditional Effects](crate::Requirement::ConditionalEffects).
When(WhenCEffect),
}
/// Applies the specified effects for all listed variables.
///
/// ## Requirements
/// Requires [Conditional Effects](crate::Requirement::ConditionalEffects).
#[derive(Debug, Clone, PartialEq)]
pub struct ForallCEffect {
/// The (possibly empty) set of variables constraining the effects.
pub variables: TypedVariables,
/// The effects to apply.
pub effects: Effects,
}
impl ForallCEffect {
/// Creates a new [`ForallCEffect`] value.
pub const fn new(variables: TypedVariables, effects: Effects) -> Self {
ForallCEffect { variables, effects }
}
}
/// Applies the specified effects for all listed variables.
///
/// ## Requirements
/// Requires [Conditional Effects](crate::Requirement::ConditionalEffects).
#[derive(Debug, Clone, PartialEq)]
pub struct WhenCEffect {
/// The antecedent. This needs to be true for the effect to apply.
pub condition: GoalDefinition,
/// The consequent. This is the effect that applies when the condition is true.
pub effect: ConditionalEffect,
}
impl WhenCEffect {
/// Creates a new [`WhenCEffect`] value.
pub const fn new(condition: GoalDefinition, effect: ConditionalEffect) -> Self {
WhenCEffect { condition, effect }
}
}
impl CEffect {
/// Crates a new effect.
pub const fn new_p_effect(effect: PEffect) -> Self {
Self::Effect(effect)
}
/// Creates a new universal effect that applies to all
/// the specified variables.
///
/// ## Requirements
/// Requires [Conditional Effects](crate::Requirement::ConditionalEffects).
pub const fn new_forall(variables: TypedVariables, effect: Effects) -> Self {
Self::Forall(ForallCEffect::new(variables, effect))
}
/// Creates a new conditional effect.
///
/// ## Requirements
/// Requires [Conditional Effects](crate::Requirement::ConditionalEffects).
pub const fn new_when(condition: GoalDefinition, effect: ConditionalEffect) -> Self {
Self::When(WhenCEffect::new(condition, effect))
}
}
impl From<PEffect> for CEffect {
fn from(value: PEffect) -> Self {
CEffect::new_p_effect(value)
}
}
impl From<ForallCEffect> for CEffect {
fn from(value: ForallCEffect) -> Self {
CEffect::Forall(value)
}
}
impl From<WhenCEffect> for CEffect {
fn from(value: WhenCEffect) -> Self {
CEffect::When(value)
}
}
impl From<(TypedVariables, Effects)> for ForallCEffect {
fn from(value: (TypedVariables, Effects)) -> Self {
ForallCEffect::new(value.0, value.1)
}
}
impl From<(GoalDefinition, ConditionalEffect)> for WhenCEffect {
fn from(value: (GoalDefinition, ConditionalEffect)) -> Self {
WhenCEffect::new(value.0, value.1)
}
}
impl TryInto<PEffect> for CEffect {
type Error = ();
fn try_into(self) -> Result<PEffect, Self::Error> {
match self {
CEffect::Effect(x) => Ok(x),
CEffect::Forall(_) => Err(()),
CEffect::When(_) => Err(()),
}
}
}
impl TryInto<WhenCEffect> for CEffect {
type Error = ();
fn try_into(self) -> Result<WhenCEffect, Self::Error> {
match self {
CEffect::Effect(_) => Err(()),
CEffect::Forall(_) => Err(()),
CEffect::When(x) => Ok(x),
}
}
}
impl TryInto<ForallCEffect> for CEffect {
type Error = ();
fn try_into(self) -> Result<ForallCEffect, Self::Error> {
match self {
CEffect::Effect(_) => Err(()),
CEffect::Forall(x) => Ok(x),
CEffect::When(_) => Err(()),
}
}
}