start testing, fixing

src/main.rs

@@ -38,6 +38,7 @@
 
 use chumsky::{input::Stream, prelude::*};
 use rust_embed::Embed;
+use std::collections::HashMap;
 
 mod spans;
 
@@ -135,7 +136,7 @@ pub fn run(src: &'static str) {
     let tokens = tokens.unwrap();
     let to_parse = tokens.clone();
 
-    let (ast, parse_errors) = parser()
+    let (parse_result, parse_errors) = parser()
         .parse(Stream::from_iter(to_parse).map((0..src.len()).into(), |(t, s)| (t, s)))
         .into_output_errors();
     if !parse_errors.is_empty() {
@@ -143,22 +144,31 @@ pub fn run(src: &'static str) {
         return;
     }
 
-    let ast = ast.unwrap().0;
+    let (ast, span) = parse_result.unwrap();
 
-    let mut ctx = prelude();
-    ctx.ast = *
+    let dummy_prelude = vec![];
 
-    let result = ctx.eval();
+    let mut valxor = validator::Validator::new(&ast, span, &dummy_prelude);
 
-    match result {
-        Ok(result) => println!("{}", result),
-        Err(LErr { msg, .. }) => println!("Errors!\n{}", msg),
-    }
+    valxor.validate();
+
+    dbg!(valxor);
+
+    // let mut ctx = prelude();
+    // ctx.ast = *
+
+    // let result = ctx.eval();
+
+    // match result {
+    //     Ok(result) => println!("{}", result),
+    //     Err(LErr { msg, .. }) => println!("Errors!\n{}", msg),
+    // }
 }
 
 pub fn main() {
     let src = "
-add (1, 2)
+box foo = 42
+foo
     ";
     run(src);
     // struct_scalpel::print_dissection_info::<value::Value>()

src/validator.rs

@@ -49,7 +49,7 @@ pub struct Validator<'a> {
 }
 
 impl<'a> Validator<'a> {
-    fn new(ast: &'a mut Ast, span: Span, prelude: &'a Vec<String>) -> Validator<'a> {
+    pub fn new(ast: &'a Ast, span: Span, prelude: &'a Vec<String>) -> Validator<'a> {
         Validator {
             locals: vec![],
             prelude,
@@ -99,13 +99,15 @@ impl<'a> Validator<'a> {
         self.status.used_bindings.push(name);
     }
 
-    fn validate(&mut self) {
+    pub fn validate(&mut self) {
         let root = self.ast;
         match root {
             Ast::Error => unreachable!(),
             Ast::Word(name) | Ast::Splat(name) => {
                 if !self.resolved(name) {
-                    self.err(format!("unbound name {name}"))
+                    self.err(format!("unbound name `{name}`"))
+                } else {
+                    self.use_name(name.to_string())
                 }
             }
             Ast::Interpolated(parts) => {
@@ -113,7 +115,9 @@ impl<'a> Validator<'a> {
                     if let (StringPart::Word(name), span) = part {
                         self.span = *span;
                         if !self.resolved(name.as_str()) {
-                            self.err(format!("unbound name {name}"))
+                            self.err(format!("unbound name `{name}`"));
+                        } else {
+                            self.use_name(name.to_string());
                         }
                     }
                 }
@@ -276,14 +280,26 @@ impl<'a> Validator<'a> {
             Ast::Box(name, boxed) => {
                 if self.bound(name).is_some() {
                     self.err(format!("box name `{name}` is already bound"));
+                } else {
+                    self.bind(name.to_string());
                 }
                 let (expr, span) = boxed.as_ref();
                 self.ast = expr;
                 self.span = *span;
                 self.validate();
             }
-            Ast::Let(lhs, rhs) => todo!(),
-            Ast::Match(scrutinee, clauses) => todo!(),
+            Ast::Let(lhs, rhs) => {
+                let (expr, span) = rhs.as_ref();
+                self.ast = expr;
+                self.span = *span;
+                self.validate();
+            }
+            Ast::Match(scrutinee, clauses) => {
+                let (expr, span) = scrutinee.as_ref();
+                self.ast = expr;
+                self.span = *span;
+                self.validate();
+            }
 
             Ast::FnDeclaration(name) => {
                 let tailpos = self.status.tail_position;
@@ -312,11 +328,18 @@ impl<'a> Validator<'a> {
                     // add clause arity to arities
                 }
 
+                // this should be right
+                // we can't bind anything that's already bound,
+                // even in arg names
+                // so anything that is already bound and used
+                // will, of necessity, be closed over
+                // we don't want to try to close over locals in functions
                 let mut closed_over = HashSet::new();
-
                 for binding in self.status.used_bindings.iter().skip(from) {
+                    if self.bound(binding.as_str()).is_some() {
                         closed_over.insert(binding.clone());
                     }
+                }
 
                 let info = FnInfo::Defined(arities, closed_over);
 
@@ -361,14 +384,29 @@ impl<'a> Validator<'a> {
                 let in_loop = self.status.in_loop;
                 self.status.in_loop = true;
 
-                let (expr, span) = body;
-                self.span = span;
-                self.expr = expr;
-                self.validate();
+                // let (expr, span) = body;
+                // self.span = span;
+                // self.expr = expr;
+                // self.validate();
 
                 self.status.in_loop = in_loop;
             }
-            Ast::Recur(args) => {}
+            Ast::Recur(args) => {
+                if !self.status.in_loop {
+                    self.err("you may only use `recur` in a loop form".to_string());
+                }
+                if !self.status.tail_position {
+                    self.err("you may only use `recur` in tail position".to_string());
+                }
+
+                self.status.tail_position = false;
+                for arg in args {
+                    let (expr, span) = arg;
+                    self.ast = expr;
+                    self.span = *span;
+                    self.validate();
+                }
+            }
             // terminals can never be invalid
             Ast::Nil | Ast::Boolean(_) | Ast::Number(_) | Ast::Keyword(_) | Ast::String(_) => (),
         };