Struct Rule

pub struct Rule {
    pub id: RuleId,
    pub root_term: TermId,
    pub args: Vec<Pattern>,
    pub iflets: Vec<IfLet>,
    pub rhs: Expr,
    pub vars: Vec<BoundVar>,
    pub prio: i64,
    pub pos: Pos,
    pub name: Option<Sym>,
}

A term rewrite rule.

Fields

id: RuleId

This rule’s id.

root_term: TermId

The left-hand side pattern that this rule matches.

args: Vec<Pattern>

Patterns to test against the root term’s arguments.

iflets: Vec<IfLet>

Any subpattern “if-let” clauses.

rhs: Expr

The right-hand side expression that this rule evaluates upon successful match.

vars: Vec<BoundVar>

Variable names used in this rule, indexed by VarId.

prio: i64

The priority of this rule, defaulted to 0 if it was missing in the source.

pos: Pos

The source position where this rule is defined.

name: Option<Sym>

The optional name for this rule.

Implementations

impl Rule

pub fn visit<V: RuleVisitor>( &self, visitor: &mut V, termenv: &TermEnv, ) -> V::Expr

Recursively visit every pattern and expression in this rule. Returns the RuleVisitor::Expr that was returned from RuleVisitor::add_expr when that function was called on the rule’s right-hand side.

Trait Implementations

impl Clone for Rule

fn clone(&self) -> Rule

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Rule

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

Formats the value using the given formatter.