Improved match item span

crates/codegen/src/statement.rs

@@ -59,7 +59,11 @@ impl GenRust for Statement {
                 cg.add(" {");
                 cg.indent += 1;
 
-                for (pat, body) in match_items {
+                for match_item in match_items {
+                    cg.add_indentedln(&match_item.get_comment());
+
+                    let MatchItem(pat, body) = &match_item.item;
+
                     for (i, p) in pat.iter().enumerate() {
                         cg.addln("");
                         cg.add_indented("");

crates/parser/src/ast/statement.rs

@@ -35,7 +35,7 @@ pub enum Statement {
         iterator: Expression,
         body: StatementBody,
     },
-    Match(Expression, Vec<(Vec<Pattern>, Expression)>),
+    Match(Expression, Vec<Spanned<MatchItem>>),
 
     VarDecl(VarDeclStmt),
     Return(Option<Expression>),
@@ -43,6 +43,9 @@ pub enum Statement {
     Continue,
 }
 
+#[derive(Debug, Clone, Serialize)]
+pub struct MatchItem(pub Vec<Pattern>, pub Expression);
+
 #[derive(Debug, Clone, Serialize)]
 pub struct VarDecl {
     pub name: Pattern,

crates/parser/src/parser/common/statement.rs

@@ -2,7 +2,7 @@ use crate::{
     Rule,
     ast::*,
     ast_ensure, ast_expr,
-    error::{AstError, AstResult, IntoErr, collect_recovered},
+    error::{AstError, IntoErr, collect_recovered},
 };
 
 impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Block {
@@ -103,18 +103,23 @@ impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Statement {
 
             Rule::match_stmt => ast_expr!(Statement::Match(
                 inner.next().unwrap().try_into(),
-                inner
-                    .map(|match_itms| {
-                        let mut match_inner = match_itms.into_inner();
-                        Ok((
-                            collect_recovered(match_inner.next().unwrap().into_inner()).get()?,
-                            Expression::try_from(match_inner.next().unwrap()).get()?,
-                        ))
-                    })
-                    .collect::<AstResult<'a, Vec<_>>>(),
+                collect_recovered(inner),
             )),
 
             _ => AstError::bug_unimplemented(pair),
         }
     }
 }
+
+impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for MatchItem {
+    type Error = AstError<'a, Self>;
+
+    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
+        let mut match_inner = pair.into_inner();
+
+        Ok(MatchItem(
+            collect_recovered(match_inner.next().unwrap().into_inner()).get()?,
+            Expression::try_from(match_inner.next().unwrap()).get()?,
+        ))
+    }
+}