Starting eval framework

src/schala_lang/eval.rs

@@ -0,0 +1,15 @@
+use schala_lang::parsing::AST;
+
+pub struct ReplState {
+}
+
+impl ReplState {
+  pub fn new() -> ReplState {
+    ReplState { }
+  }
+
+  pub fn evaluate(&mut self, ast: AST) -> String {
+    format!("Evaluated AST: {:?}", ast)
+  }
+}
+

src/schala_lang/mod.rs

@@ -2,13 +2,17 @@ use itertools::Itertools;
 use language::{ProgrammingLanguageInterface, EvalOptions, TraceArtifact, ReplOutput};
 
 mod parsing;
+mod eval;
 
 pub struct Schala {
+  state: eval::ReplState
 }
 
 impl Schala {
   pub fn new() -> Schala {
-    Schala { }
+    Schala {
+      state: eval::ReplState::new(),
+    }
   }
 }
 
@@ -49,7 +53,7 @@ impl ProgrammingLanguageInterface for Schala {
       }
     };
 
-    let evaluation_output = format!("{:?}", ast);
+    let evaluation_output = self.state.evaluate(ast);
     output.add_output(evaluation_output);
     return output;
   }

src/schala_lang/parsing.rs

@@ -620,7 +620,7 @@ impl Parser {
       _ => None
     };
     if let Some(a) = expr_body.1 {
-        panic!("UNexpected thing {:?}", a);
+      return ParseError::new("Bad parse state");
     }
     expr_body.1 = type_anno;
     Ok(expr_body)