Implements base functionality for __TYPE__ and __PROC__ (#366)

We basically just capture them early, and then treat them as unique
symbols. We don't replace inline or anything because the required
context isn't quite there.

crates/dm-langserver/src/find_references.rs

@@ -544,6 +544,20 @@ impl<'o> WalkProc<'o> {
                     StaticType::None
                 }
             },
+
+            Term::__TYPE__ => {
+                self.tab.use_symbol(self.ty.id, location);
+                StaticType::None
+            },
+            Term::__PROC__ => {
+                let Some(proc) = self.proc else {
+                    return StaticType::None
+                };
+                if let Some(decl) = self.ty.get_proc_declaration(proc.name()) {
+                    self.tab.use_symbol(decl.id, location);
+                }
+                StaticType::None
+            }
         }
     }
 

crates/dreamchecker/src/lib.rs

@@ -1738,6 +1738,8 @@ impl<'o, 's> AnalyzeProc<'o, 's> {
                 let src = self.ty;
                 if let Some(proc) = self.ty.get_proc(unscoped_name) {
                     self.visit_call(location, src, proc, args, false, local_vars)
+                } else if unscoped_name == "__PROC__" {
+                    self.visit_call(location, src, self.proc_ref, args, false, local_vars)
                 } else if unscoped_name == "SpacemanDMM_unlint" {
                     // Escape hatch for cases like `src` in macros used in
                     // global procs.
@@ -1882,6 +1884,20 @@ impl<'o, 's> AnalyzeProc<'o, 's> {
                 self.visit_arguments(location, args, local_vars);
                 Analysis::empty()  // TODO
             },
+            Term::__TYPE__ => {
+                let pop = dm::constants::Pop::from(self.ty.path.split('/').skip(1).map(ToOwned::to_owned).collect::<Vec<_>>().into_boxed_slice());
+                Analysis {
+                    static_ty: StaticType::None,
+                    aset: assumption_set![Assumption::IsPath(true, self.ty)],
+                    value: Some(Constant::Prefab(Box::new(pop))),
+                    fix_hint: None,
+                    is_impure: None,
+                }
+            },
+            Term::__PROC__ => {
+                // Can't fuckin do it bros
+                Analysis::empty()
+            },
         }
     }
 

crates/dreammaker/src/ast.rs

@@ -643,6 +643,10 @@ impl<'a, T: fmt::Display> fmt::Display for FormatTreePath<'a, T> {
 /// A series of identifiers separated by path operators.
 pub type TypePath = Vec<(PathOp, Ident)>;
 
+pub fn make_typepath(segments: Vec<String>) -> TypePath {
+    segments.into_iter().fold(vec![], |mut acc, segment| { acc.push((PathOp::Slash, segment)); acc })
+}
+
 pub struct FormatTypePath<'a>(pub &'a [(PathOp, Ident)]);
 
 impl<'a> fmt::Display for FormatTypePath<'a> {
@@ -867,6 +871,10 @@ pub enum Term {
     Resource(String),
     /// An `as()` call, with an input type. Undocumented.
     As(InputType),
+    /// A reference to our current proc's name
+    __PROC__,
+    /// A reference to the current proc/scope's type
+    __TYPE__,
 
     // Non-function calls with recursive contents -----------------------------
     /// An expression contained in a term.

crates/dreammaker/src/constants.rs

@@ -783,6 +783,15 @@ impl<'a> ConstantFolder<'a> {
             Term::Int(v) => Constant::Float(v as f32),
             Term::Float(v) => Constant::from(v),
             Term::Expr(expr) => self.expr(*expr, type_hint)?,
+            Term::__TYPE__ => {
+                if let Some(obj_tree) = &self.tree {
+                    let typeval = TypeRef::new(obj_tree, self.ty).get();
+                    let path = make_typepath(typeval.path.split("/").filter(|elem| *elem != "").map(|segment| segment.to_string()).collect());
+                    Constant::Prefab(Box::new(self.prefab(Prefab::from(path))?))
+                } else {
+                    return Err(self.error("No type context".to_owned()))
+                }
+            },
             _ => return Err(self.error("non-constant expression".to_owned())),
         })
     }

crates/dreammaker/src/parser.rs

@@ -2073,6 +2073,17 @@ impl<'ctx, 'an, 'inp> Parser<'ctx, 'an, 'inp> {
                 require!(self.exact(Token::Punct(Punctuation::RParen)));
                 Term::As(input_type)
             },
+            // term :: __PROC__
+            Token::Ident(ref i, _) if i == "__PROC__" => {
+                // We cannot replace with the proc path yet, you don't need one it's fine
+                Term::__PROC__
+            },
+
+            // term :: __TYPE__
+            Token::Ident(ref i, _) if i == "__TYPE__" => {
+                // We cannot replace with the typepath yet, so we'll hand back a term we can parse later
+                Term::__TYPE__
+            },
 
             // term :: ident arglist | ident
             Token::Ident(i, _) => {