conlang: Add Tuple-Struct Patterns

- Patterns are no longer parsed with the highest precedence
- Function calls with just a path and a tuple of args can now be transformed into a Pattern

compiler/cl-ast/src/ast.rs

@@ -424,6 +424,7 @@ pub enum Pattern {
     Tuple(Vec<Pattern>),
     Array(Vec<Pattern>),
     Struct(Path, Vec<(Sym, Option<Pattern>)>),
+    TupleStruct(Path, Vec<Pattern>),
 }
 
 /// A `match` expression: `match` `{` ([MatchArm] `,`)* [MatchArm]? `}`

compiler/cl-ast/src/ast_impl.rs

@@ -487,6 +487,10 @@ mod display {
                     }
                     Ok(())
                 }
+                Pattern::TupleStruct(path, items) => {
+                    write!(f, "{path}")?;
+                    separate(items, ", ")(f.delimit(INLINE_PARENS))
+                }
             }
         }
     }
@@ -884,8 +888,19 @@ mod convert {
                         .map(|e| Pattern::try_from(e.kind))
                         .collect::<Result<_, _>>()?,
                 ),
-                // ExprKind::Index(index) => todo!(),
-                // ExprKind::Member(member) => todo!(),
+                ExprKind::Binary(Binary { kind: BinaryKind::Call, parts }) => {
+                    let (ExprKind::Path(path), args) = *parts else {
+                        return Err(parts.0);
+                    };
+                    match args {
+                        ExprKind::Empty | ExprKind::Tuple(_) => {}
+                        _ => return Err(args),
+                    }
+                    let Pattern::Tuple(args) = Pattern::try_from(args)? else {
+                        unreachable!("Arguments should be convertible to pattern!")
+                    };
+                    Pattern::TupleStruct(path, args)
+                }
                 ExprKind::Structor(Structor { to, init }) => {
                     let fields = init
                         .into_iter()

compiler/cl-ast/src/ast_visitor/fold.rs

@@ -267,6 +267,13 @@ pub trait Fold {
                     .map(|(name, bind)| (name, bind.map(|p| self.fold_pattern(p))))
                     .collect(),
             ),
+            Pattern::TupleStruct(path, items) => Pattern::TupleStruct(
+                self.fold_path(path),
+                items
+                    .into_iter()
+                    .map(|bind| self.fold_pattern(bind))
+                    .collect(),
+            ),
         }
     }
 

compiler/cl-ast/src/ast_visitor/visit.rs

@@ -234,6 +234,10 @@ pub trait Visit<'a>: Sized {
                     });
                 });
             }
+            Pattern::TupleStruct(path, items) => {
+                self.visit_path(path);
+                items.iter().for_each(|bind| self.visit_pattern(bind));
+            }
         }
     }
 

compiler/cl-interpret/src/function/collect_upvars.rs

@@ -127,6 +127,10 @@ impl<'a> Visit<'a> for CollectUpvars<'_> {
                     });
                 });
             }
+            Pattern::TupleStruct(path, items) => {
+                self.visit_path(path);
+                items.iter().for_each(|bind| self.visit_pattern(bind));
+            }
         }
     }
 }

compiler/cl-interpret/src/interpret.rs

@@ -320,6 +320,9 @@ mod assignment {
                         None => set.push(name),
                     });
                 }
+                Pattern::TupleStruct(_path, items) => {
+                    items.iter().for_each(|pat| patvars(set, pat));
+                }
             }
         }
         let mut set = Vec::new();

compiler/cl-parser/src/parser.rs

@@ -1080,7 +1080,7 @@ impl Parse<'_> for Return {
 
 impl Parse<'_> for Pattern {
     fn parse(p: &mut Parser<'_>) -> PResult<Self> {
-        let value = prec::exprkind(p, prec::Precedence::Highest.level())?;
+        let value = prec::exprkind(p, prec::Precedence::Pattern.level())?;
         Pattern::try_from(value)
             .map_err(|_| p.error(ExpectedParsing { want: Parsing::Pattern }, Parsing::Pattern))
     }

compiler/cl-parser/src/parser/prec.rs

@@ -255,8 +255,8 @@ pub enum Precedence {
     Index,
     Cast,
     Member, // left-associative
+    Pattern,
     Call,
-    Highest,
 }
 
 impl Precedence {

compiler/cl-repl/examples/yaml.rs

@@ -438,13 +438,20 @@ pub mod yamlify {
                 Pattern::Struct(path, items) => {
                     {
                         let mut y = y.key("Struct");
-                        y.pair("name", path);
+                        y.yaml(path);
                         for (name, item) in items {
                             y.pair(name, item);
                         }
                     }
                     y
                 }
+                Pattern::TupleStruct(path, items) => {
+                    {
+                        let mut y = y.key("TupleStruct");
+                        y.yaml(path).list(items);
+                    }
+                    y
+                }
             };
         }
     }