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use derive_more::Display;
// Generic
pub trait TypingSignifier {
const SIGNIFIER: &'static str;
}
#[derive(Clone, PartialEq, Display, Debug)]
#[display(".{tag} {bound} => {body}")]
pub struct CaseArm<T: std::fmt::Display> {
pub tag: String,
pub bound: String,
pub body: T,
}
#[derive(Clone, PartialEq, Display, Debug)]
#[display("{name} {} {carries}", T::SIGNIFIER)]
pub struct Field<T: std::fmt::Display + TypingSignifier> {
pub name: String,
pub carries: T,
}
// Set layer
#[derive(Clone, PartialEq, Display, Debug)]
pub enum BuiltIn {
Nat,
Int,
Float,
Str,
Bool,
}
#[derive(Clone, PartialEq, Display, Debug)]
pub enum Set {
#[display("{_0}")]
BuiltIn(BuiltIn),
#[display("record {{ {} }}", _0.iter().map(|f| f.to_string()).collect::<Vec<_>>().join(" , "))]
Record(Vec<Field<Set>>),
#[display("variant [ {} ]", _0.iter().map(|f| f.to_string()).collect::<Vec<_>>().join(" | "))]
Variant(Vec<Field<Set>>),
#[display("set-of({_0})")]
ClaimedSet(Instance),
#[display("{_0}")]
Var(String),
}
impl TypingSignifier for Set {
const SIGNIFIER: &'static str = ":";
}
// Signature layer
#[derive(Clone, PartialEq, Display, Debug)]
#[display("({name} : {set})")]
pub struct Param {
pub name: String,
pub set: Set,
}
#[derive(Clone, PartialEq, Display, Debug)]
pub enum Signature {
#[display("Set")]
Set,
#[display("theory {{ {} }}", _0.iter().map(|f| f.to_string()).collect::<Vec<_>>().join(" , "))]
Theory(Vec<Field<Signature>>),
#[display("{} -> {}", params.iter().map(|p| p.to_string()).collect::<Vec<_>>().join(", "), codomain)]
Ext {
params: Vec<Param>,
codomain: Box<Signature>,
},
#[display("{_0}")]
Var(String),
}
impl TypingSignifier for Signature {
const SIGNIFIER: &'static str = "::";
}
// Element layer
#[derive(Clone, PartialEq, Display, Debug)]
pub enum Literal {
Nat(u64),
Int(i64),
Float(f64),
Str(String),
Bool(bool),
}
#[derive(Clone, PartialEq, Display, Debug)]
#[display(".{name} = {element}")]
pub struct ElemAssign {
pub name: String,
pub element: Element,
}
#[derive(Clone, PartialEq, Display, Debug)]
pub enum Element {
#[display("{_0}")]
Literal(Literal),
#[display("{_0}")]
Var(String),
#[display("{{ {} }}", _0.iter().map(|f| f.to_string()).collect::<Vec<_>>().join(" , "))]
Record(Vec<ElemAssign>),
#[display("{element} .{field}")]
Project {
element: Box<Element>,
field: String,
},
#[display("{field}. {element}")]
Inject {
field: String,
element: Box<Element>,
},
#[display("case {} of {{ {} }}", scrutinee, arms.iter().map(|a| a.to_string()).collect::<Vec<_>>().join(" | "))]
Case {
scrutinee: Box<Element>,
arms: Vec<CaseArm<Element>>,
},
}
// Instance layer
#[derive(Clone, PartialEq, Display, Debug)]
#[display(".{name} = {instance}")]
pub struct InstAssign {
pub name: String,
pub instance: Instance,
}
#[derive(Clone, PartialEq, Display, Debug)]
pub enum Instance {
#[display("({_0} :: Set)")]
SetCoerce(Box<Set>),
#[display("{_0}")]
Var(String),
#[display("{{ {} }}", _0.iter().map(|f| f.to_string()).collect::<Vec<_>>().join(", "))]
Record(Vec<InstAssign>),
#[display("for {}, {body}", params.iter().map(|p| p.to_string()).collect::<Vec<_>>().join(""))]
For {
params: Vec<Param>,
body: Box<Instance>,
},
#[display("{instance} {}", args.iter().map(|e| e.to_string()).collect::<Vec<_>>().join(" "))]
App {
instance: Box<Instance>,
args: Vec<Element>,
},
#[display("{instance} .{field}")]
Project {
instance: Box<Instance>,
field: String,
},
#[display("case {} of [ {} ]", scrutinee, arms.iter().map(|a| a.to_string()).collect::<Vec<_>>().join(" | "))]
Case {
scrutinee: Box<Element>,
arms: Vec<CaseArm<Instance>>,
},
}
// Declarations
#[derive(Clone, PartialEq, Display, Debug)]
pub enum Decl {
#[display("let set {name} = {set}")]
Set { name: String, set: Set },
#[display("let element {name} : {set} = {element}")]
Element {
name: String,
set: Set,
element: Element,
},
#[display("let signature {name} = {signature}")]
Signature { name: String, signature: Signature },
#[display("let instance {name} :: {signature} = {instance}")]
Instance {
name: String,
signature: Signature,
instance: Instance,
},
}
#[derive(Display, Debug)]
#[display("{}", _0.iter().map(|d| d.to_string()).collect::<Vec<_>>().join("\n"))]
pub struct Programme(pub Vec<Decl>);
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