Functionality to request/respond to meta items

schala-lang/language/src/lib.rs

@@ -21,7 +21,7 @@ use std::cell::RefCell;
 use std::rc::Rc;
 
 use itertools::Itertools;
-use schala_repl::{ProgrammingLanguageInterface, ComputationRequest, ComputationResponse, GlobalOutputStats};
+use schala_repl::{ProgrammingLanguageInterface, ComputationRequest, ComputationResponse, LangMetaRequest, LangMetaResponse, GlobalOutputStats};
 
 macro_rules! bx {
   ($e:expr) => { Box::new($e) }

schala-repl/src/language.rs

@@ -15,6 +15,10 @@ pub trait ProgrammingLanguageInterface {
   fn repl_request(&self, repl_request: String) -> String {
     format!("<<No custom interpreter directives or help info specified>>")
   }
+
+  fn request_meta(&mut self, _request: LangMetaRequest) -> LangMetaResponse {
+    LangMetaResponse::Custom { kind: format!("not-implemented"), value: format!("") }
+  }
 }
 
 pub struct ComputationRequest<'a> {
@@ -38,6 +42,22 @@ pub struct DebugResponse {
   value: String
 }
 
+pub enum LangMetaRequest {
+  StageNames,
+  Custom {
+    kind: String,
+    value: String
+  }
+}
+
+pub enum LangMetaResponse {
+  StageNames(Vec<String>),
+  Custom {
+    kind: String,
+    value: String
+  }
+}
+
 #[derive(Default, Debug)]
 pub struct GlobalOutputStats {
   total_duration: Option<time::Duration>,

schala-repl/src/lib.rs

@@ -24,7 +24,7 @@ mod repl;
 mod language;
 mod webapp;
 
-pub use language::{ProgrammingLanguageInterface, ComputationRequest, ComputationResponse, GlobalOutputStats};
+pub use language::{ProgrammingLanguageInterface, ComputationRequest, ComputationResponse, LangMetaRequest, LangMetaResponse, GlobalOutputStats};
 
 include!(concat!(env!("OUT_DIR"), "/static.rs"));
 const VERSION_STRING: &'static str = "0.1.0";