Enum voile::syntax::core::Val

pub enum Val {
    Type(Level),
    Lam(Closure),
    Dt(DtKind, Box<Self>, Closure),
    Sum(Variants),
    Cons(String, Box<Self>),
    Pair(Box<Self>, Box<Self>),
    Neut(Neutral),
}

Non-redex, canonical values.

Variants

Type(Level)

Type universe.

Lam(Closure)

Closure with parameter typed. For untyped closures, it can be represented as Neut directly.

Dt(DtKind, Box<Self>, Closure)

Pi-like types (dependent types), with parameter explicitly typed.

Sum(Variants)

Sum type literal.

Cons(String, Box<Self>)

Constructor invocation.

Pair(Box<Self>, Box<Self>)

Sigma instance.

Neut(Neutral)

Neutral value means irreducible but not canonical values.

Methods

impl Val

pub fn apply(self, arg: Val) -> Val

$$ \newcommand{\inst}[0]{\texttt{inst}} \newcommand{\app}[0]{\texttt{app}} \begin{alignedat}{1} \app(\lambda C, o) &= \inst(C, o) \\ \app([k], o) &= [k\ o] \end{alignedat} $$ For evaluation during beta-reduction.

pub fn apply_borrow(self, arg: &Val) -> Val

pub fn first(self) -> Val

$$ \newcommand{\first}[0]{\texttt{first}} \newcommand{\second}[0]{\texttt{second}} \begin{alignedat}{1} \first(n, m) &= n \\ \first([k]) &= [k\ .1] \\ \end{alignedat} $$ For evaluation during beta-reduction.

pub fn second(self) -> Val

$$ \newcommand{\first}[0]{\texttt{first}} \newcommand{\second}[0]{\texttt{second}} \begin{alignedat}{1} \second(n, m) &= m \\ \second([k]) &= [k\ .2] \end{alignedat} $$ For evaluation during beta-reduction.

pub(crate) fn attach_dbi(self, dbi: DBI) -> Self

impl Val

pub fn is_type(&self) -> bool

pub fn is_universe(&self) -> bool

pub fn try_into_sum(self) -> Result<Variants, Self>

pub fn pair(first: Self, second: Self) -> Self

pub fn cons(name: String, param: Self) -> Self

pub fn lift(levels: u32, expr: Neutral) -> Self

pub fn meta(index: MI) -> Self

pub fn var(index: DBI) -> Self

pub fn lam(body: Self) -> Self

pub fn bot() -> TVal

pub fn glob(index: GI) -> Self

pub fn fresh_axiom() -> Self

pub(crate) fn postulate(uid: UID) -> Self

pub(crate) fn generate(uid: UID, dbi: DBI) -> Self

pub fn fresh_unimplemented(index: GI) -> Self

pub fn app(function: Neutral, args: Vec<Self>) -> Self

pub fn fst(pair: Neutral) -> Self

pub fn snd(pair: Neutral) -> Self

pub fn dependent_type(kind: DtKind, param_type: TVal, body: TVal) -> TVal

pub fn pi(param_type: TVal, body: TVal) -> TVal

pub fn sig(param_type: TVal, body: TVal) -> TVal

pub fn into_neutral(self) -> Result<Neutral, Self>

pub fn map_neutral(self, f: &mut impl FnMut(Neutral) -> Self) -> Self

Traverse through the AST and change all Neutral values.

pub fn try_map_neutral<R>(
    self,
    f: &mut impl FnMut(Neutral) -> Result<Self, R>
) -> Result<Self, R>

Traverse through the AST and change all Neutral values.

pub fn map_axiom(self, f: &mut impl FnMut(Axiom) -> Neutral) -> Self

pub fn generated_to_var(self) -> Self

pub fn unimplemented_to_glob(self) -> Self

pub fn fold_neutral<R, F: Fn(R, Neutral) -> R + Copy>(self, init: R, f: F) -> R

Traverse through the AST in a stateful manner.

pub fn try_fold_neutral<E, R, F: Fn(R, Neutral) -> Result<R, E> + Copy>(
    self,
    init: R,
    f: F
) -> Result<R, E>

Traverse through the AST with possible error.

impl Val

pub fn into_info(self, syntax_info: SyntaxInfo) -> ValInfo

Trait Implementations

impl RedEx for Val

fn reduce_with_dbi(self, arg: Val, dbi: DBI) -> Val

This is primarily a private implementation-related API. Use at your own risk.

fn reduce_with_dbi_borrow(self, arg: &Val, dbi: DBI) -> Val

When the argument is not likely to be used, prefer this over reduce_with_dbi.

impl LiftEx for Val

fn lift(self, levels: u32) -> Val

Lift the level of self.

fn calc_level(&self) -> Option<Level>

Internal API, for code sharing only.

fn level(&self) -> Level

Calculate the level of self, like a normal value will have level 0, a type expression will have level 1 (or higher).

impl PartialEq<Val> for Val

fn eq(&self, other: &Val) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Val) -> bool

This method tests for !=.

impl Eq for Val

fn assert_receiver_is_total_eq(&self)

impl Default for Val

fn default() -> Self

Returns the "default value" for a type.

impl Clone for Val

fn clone(&self) -> Val

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Val

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Display for Val

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.