Grcov report - bubble.rs

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use conjure_cp::ast::{DomainPtr, GroundDomain, Metadata};

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use conjure_cp::ast::{Expression, Moo, SymbolTable};

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use conjure_cp::rule_engine::{

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    ApplicationError, ApplicationError::RuleNotApplicable, ApplicationResult, Reduction,

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    register_rule,

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};

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use conjure_cp::{bug, into_matrix_expr};

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use itertools::{Itertools as _, izip};

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/// Converts an unsafe index to a safe index using a bubble expression.

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#[register_rule(("Bubble", 6000))]

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fn index_to_bubble(expr: &Expression, _: &SymbolTable) -> ApplicationResult {

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    let Expression::UnsafeIndex(_, subject, indices) = expr else {

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        return Err(RuleNotApplicable);

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};

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    let domain = subject

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        .domain_of()

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        .ok_or(ApplicationError::DomainError)?

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        .resolve()

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        .ok_or(RuleNotApplicable)?;

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    // TODO: tuple, this is a hack right now just to avoid the rule being applied to tuples, but could we safely modify the rule to

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    // handle tuples as well?

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    if matches!(domain.as_ref(), GroundDomain::Tuple(_))

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        || matches!(domain.as_ref(), GroundDomain::Record(_))

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        return Err(RuleNotApplicable);

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    let GroundDomain::Matrix(_, index_domains) = domain.as_ref() else {

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        bug!(

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            "subject of an index expression should have a matrix domain. subject: {:?}, with domain: {:?}",

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            subject,

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            domain.as_ref()

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);

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};

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    assert_eq!(

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        index_domains.len(),

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        indices.len(),

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        "in an index expression, there should be the same number of indices as the subject has index domains"

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);

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    let bubble_constraints = Moo::new(into_matrix_expr![

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        izip!(index_domains, indices)

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            .map(|(domain, index)| {

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                Expression::InDomain(

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                    Metadata::new(),

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                    Moo::new(index.clone()),

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                    DomainPtr::from(domain.clone()),

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})

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            .collect_vec()

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]);

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    let new_expr = Moo::new(Expression::SafeIndex(

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        Metadata::new(),

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        subject.clone(),

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        indices.clone(),

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));

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    Ok(Reduction::pure(Expression::Bubble(

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        Metadata::new(),

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        new_expr,

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        Moo::new(Expression::And(Metadata::new(), bubble_constraints)),

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)))

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/// Converts an unsafe slice to a safe slice using a bubble expression.

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#[register_rule(("Bubble", 6000))]

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fn slice_to_bubble(expr: &Expression, _: &SymbolTable) -> ApplicationResult {

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    let Expression::UnsafeSlice(_, subject, indices) = expr else {

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        return Err(RuleNotApplicable);

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};

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    let domain = subject

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        .domain_of()

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        .ok_or(ApplicationError::DomainError)?

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        .resolve()

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        .ok_or(RuleNotApplicable)?;

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    let GroundDomain::Matrix(_, index_domains) = domain.as_ref() else {

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        bug!(

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            "subject of a slice expression should have a matrix domain. subject: {:?}, with domain: {:?}",

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            subject,

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            domain

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);

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};

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    assert_eq!(

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        index_domains.len(),

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        indices.len(),

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        "in a slice expression, there should be the same number of indices as the subject has index domains"

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);

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    // the wildcard dimension doesn't need a constraint.

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    let bubble_constraints = Moo::new(into_matrix_expr![

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        izip!(index_domains, indices)

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            .filter_map(|(domain, index)| {

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                index

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                    .clone()

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                    // TODO(perf): This pattern of "take something with a ground domain G and re-wrap it in Moo(Domain::Ground(G))" is fairly common...

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                    .map(|index| {

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                        Expression::InDomain(

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                            Metadata::new(),

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                            Moo::new(index),

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                            DomainPtr::from(domain.clone()),

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})

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})

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            .collect_vec()

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]);

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    let new_expr = Moo::new(Expression::SafeSlice(

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        Metadata::new(),

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        subject.clone(),

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        indices.clone(),

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));

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    Ok(Reduction::pure(Expression::Bubble(

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        Metadata::new(),

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        new_expr,

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        Moo::new(Expression::And(Metadata::new(), bubble_constraints)),

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)))

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