Enum minitt::ast::Pattern

pub enum Pattern {
    Pair(Box<Self>, Box<Self>),
    Unit,
    Var(String),
}

Patt in Mini-TT.

$p ::=$

Variants

Pair(Box<Self>, Box<Self>)

$p,p$, Pair pattern. This sounds like trivial and useless, but we can achieve mutual recursion by using this pattern.

Unit

_, Unit pattern, used for introducing anonymous definitions.

Var(String)

$x$, Variable name pattern, the most typical pattern.

Methods

impl Pattern

pub fn contains(&self, name: &str) -> bool

inPat in Mini-TT.

pub fn project(&self, name: &str, val: Value) -> Result<Value, String>

$$ \begin{alignedat}{2} & \textsf{proj}^x_x(v) &&= v \\ & \textsf{proj}^{(p_1,p_2)}_x (v) &&= \textsf{proj}^{p_1}_x (v.1) \ \textnormal{if}\ x\ \textnormal{is\ in}\ p_1, \\ & \textsf{proj}^{(p_1,p_2)}_x (v) &&= \textsf{proj}^{p_2}_x (v.2) \ \textnormal{if}\ x\ \textnormal{is\ in}\ p_2 \end{alignedat} $$ patProj in Mini-TT.

Trait Implementations

impl PartialEq<Pattern> for Pattern

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

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

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

This method tests for !=.

impl Ord for Pattern

fn cmp(&self, other: &Pattern) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

impl Eq for Pattern

fn assert_receiver_is_total_eq(&self)

impl PartialOrd<Pattern> for Pattern

fn partial_cmp(&self, other: &Pattern) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Pattern) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Pattern) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Pattern) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Pattern) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Clone for Pattern

fn clone(&self) -> Pattern

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Pattern

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

Formats the value using the given formatter.

impl Display for Pattern

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

Formats the value using the given formatter.