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Implement match condition #861

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Implement match condition #861

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d1ffdd0
Add example and documentation for pattern matching condition
fpottbaecker Aug 31, 2023
3b237b7
Add rudimentary indentation to RCST print
fpottbaecker Aug 31, 2023
8e38c46
Add optional condition to match cases
fpottbaecker Jan 6, 2024
3a05f52
Add match conditions to rich AST representation
fpottbaecker Jan 6, 2024
38f30f4
Add match conditions to rich HIR
fpottbaecker Jan 6, 2024
ad18852
Apply PR feedback
fpottbaecker Mar 28, 2024
fb63ffa
Resolve warnings
fpottbaecker Mar 29, 2024
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1 change: 1 addition & 0 deletions compiler/formatter/src/format.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -742,6 +742,7 @@ pub fn format_cst<'a>(
}
CstKind::MatchCase {
pattern,
condition: _, // TODO: format match case conditions
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I opened a follow-up issue: #868

arrow,
body,
} => {
Expand Down
32 changes: 30 additions & 2 deletions compiler/frontend/src/ast.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -131,6 +131,7 @@ pub struct Match {
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
pub struct MatchCase {
pub pattern: Box<Ast>,
pub condition: Option<Box<Ast>>,
pub body: Vec<Ast>,
}
#[derive(Debug, PartialEq, Eq, Clone, Hash)]
Expand Down Expand Up @@ -248,7 +249,14 @@ impl FindAst for Match {
}
impl FindAst for MatchCase {
fn find(&self, id: &Id) -> Option<&Ast> {
self.pattern.find(id).or_else(|| self.body.find(id))
self.pattern
.find(id)
.or_else(|| {
self.condition
.as_ref()
.and_then(|box condition| condition.find(id))
})
.or_else(|| self.body.find(id))
}
}
impl FindAst for OrPattern {
Expand Down Expand Up @@ -352,8 +360,15 @@ impl CollectErrors for Ast {
expression.collect_errors(errors);
cases.collect_errors(errors);
}
AstKind::MatchCase(MatchCase { pattern, body }) => {
AstKind::MatchCase(MatchCase {
pattern,
condition,
body,
}) => {
pattern.collect_errors(errors);
if let Some(box condition) = condition {
condition.collect_errors(errors);
}
body.collect_errors(errors);
}
AstKind::OrPattern(OrPattern(patterns)) => {
Expand Down Expand Up @@ -540,9 +555,22 @@ impl ToRichIr for Match {
}
impl ToRichIr for MatchCase {
fn build_rich_ir(&self, builder: &mut RichIrBuilder) {
builder.push("case ", None, EnumSet::empty());
self.pattern.build_rich_ir(builder);
if let Some(box condition) = &self.condition {
builder.push(", ", None, EnumSet::empty());
builder.indent();
builder.push_newline();
builder.push("condition ", None, EnumSet::empty());
condition.build_rich_ir(builder);
}
builder.push(" -> ", None, EnumSet::empty());
builder.indent();
builder.push_foldable(|builder| builder.push_children_multiline(&self.body));
if self.condition.is_some() {
builder.dedent();
}
builder.dedent();
}
}
impl ToRichIr for OrPattern {
Expand Down
67 changes: 49 additions & 18 deletions compiler/frontend/src/ast_to_hir.rs
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Expand Up @@ -385,34 +385,65 @@ impl Context<'_> {
cases
.iter()
.map(|case| match &case.kind {
AstKind::MatchCase(MatchCase { box pattern, body }) => {
AstKind::MatchCase(MatchCase {
box pattern,
condition,
body,
}) => {
let (pattern, pattern_identifiers) = scope.lower_pattern(pattern);

let (body, ()) = scope.with_scope(None, |scope| {
for (name, (ast_id, identifier_id)) in
pattern_identifiers.clone()
{
scope.push(
ast_id,
Expression::PatternIdentifierReference(identifier_id),
name.clone(),
);
}
scope.compile(body.as_ref());
});

(pattern, body)
let (outer_body, (condition_body, body)) =
scope.with_scope(None, |scope| {
for (name, (ast_id, identifier_id)) in
pattern_identifiers.clone()
{
scope.push(
ast_id,
Expression::PatternIdentifierReference(
identifier_id,
),
name.clone(),
);
}

let condition = condition.as_ref().map(|box condition| {
scope
.with_scope(match_id.clone(), |condition_scope| {
condition_scope.compile_single(condition);
})
.0
});

let (body, ()) =
scope.with_scope(match_id.clone(), |scope| {
scope.compile(body);
});

(condition, body)
});

hir::MatchCase {
pattern,
identifier_expressions: outer_body,
condition: condition_body,
body,
}
}
AstKind::Error { errors } => {
let pattern = Pattern::Error {
errors: errors.clone(),
};

let (body, ()) = scope.with_scope(None, |scope| {
scope.compile(&[]);
let (body, inner_body) = scope.with_scope(None, |scope| {
scope.with_scope(match_id.clone(), |_scope| {}).0
});

(pattern, body)
hir::MatchCase {
pattern,
identifier_expressions: body,
condition: None,
body: inner_body,
}
}
_ => unreachable!("Expected match case in match cases, got {case:?}."),
})
Expand Down
1 change: 1 addition & 0 deletions compiler/frontend/src/cst/error.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ pub enum CstError {
ListNotClosed,
MatchCaseMissesArrow,
MatchCaseMissesBody,
MatchCaseMissesCondition,
MatchMissesCases,
OpeningParenthesisMissesExpression,
OrPatternMissesRight,
Expand Down
10 changes: 9 additions & 1 deletion compiler/frontend/src/cst/is_multiline.rs
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Expand Up @@ -107,9 +107,17 @@ impl<D> IsMultiline for CstKind<D> {
} => expression.is_multiline() || percent.is_multiline() || cases.is_multiline(),
Self::MatchCase {
pattern,
condition,
arrow,
body,
} => pattern.is_multiline() || arrow.is_multiline() || body.is_multiline(),
} => {
pattern.is_multiline()
|| condition.as_deref().map_or(false, |(comma, condition)| {
comma.is_multiline() || condition.is_multiline()
})
|| arrow.is_multiline()
|| body.is_multiline()
}
Self::Function {
opening_curly_brace,
parameters_and_arrow,
Expand Down
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