Not working

schala-lang/language/src/lib.rs

@@ -25,7 +25,7 @@ use std::rc::Rc;
 use std::collections::HashSet;
 
 use itertools::Itertools;
-use schala_repl::{ProgrammingLanguageInterface,
+use schala_repl::{ProgrammingLanguageInterface, ProgrammingLanguageStages,
 ComputationRequest, ComputationResponse,
 LangMetaRequest, LangMetaResponse, GlobalOutputStats,
 DebugResponse, DebugAsk};
@@ -259,8 +259,17 @@ fn stage_names() -> Vec<&'static str> {
   ]
 }
 
+pub enum SchalaStages {
+  Something
+}
+impl ProgrammingLanguageStages {
+  fn to_string() -> String {
+    format!("DUMMY")
+  }
+}
 
 impl ProgrammingLanguageInterface for Schala {
+  type Stages = SchalaStages;
   fn get_language_name(&self) -> String { format!("Schala") }
   fn get_source_file_suffix(&self) -> String { format!("schala") }
 

schala-repl/src/language.rs

@@ -1,7 +1,12 @@
 use std::time;
 use std::collections::HashSet;
 
+pub trait ProgrammingLanguageStages {
+  fn to_string(&self) -> String;
+}
+
 pub trait ProgrammingLanguageInterface {
+  type Stages : ProgrammingLanguageStages;
   fn get_language_name(&self) -> String;
   fn get_source_file_suffix(&self) -> String;
 

schala-repl/src/lib.rs

@@ -21,7 +21,7 @@ use std::process::exit;
 mod repl;
 mod language;
 
-pub use language::{ProgrammingLanguageInterface,
+pub use language::{ProgrammingLanguageInterface, ProgrammingLanguageStages,
 ComputationRequest, ComputationResponse,
 LangMetaRequest, LangMetaResponse,
 DebugResponse, DebugAsk, GlobalOutputStats};
@@ -29,7 +29,7 @@ DebugResponse, DebugAsk, GlobalOutputStats};
 include!(concat!(env!("OUT_DIR"), "/static.rs"));
 const VERSION_STRING: &'static str = "0.1.0";
 
-pub fn start_repl(langs: Vec<Box<dyn ProgrammingLanguageInterface>>) {
+pub fn start_repl(langs: Vec<Box<dyn ProgrammingLanguageInterface<Stages = dyn ProgrammingLanguageStages>>>) {
   let options = command_line_options().parse(std::env::args()).unwrap_or_else(|e| {
     println!("{:?}", e);
     exit(1);
@@ -51,7 +51,7 @@ pub fn start_repl(langs: Vec<Box<dyn ProgrammingLanguageInterface>>) {
   };
 }
 
-fn run_noninteractive(filename: &str, languages: Vec<Box<ProgrammingLanguageInterface>>) {
+fn run_noninteractive(filename: &str, languages: Vec<Box<ProgrammingLanguageInterface<Stages = dyn ProgrammingLanguageStages>>>) {
   let path = Path::new(filename);
   let ext = path.extension().and_then(|e| e.to_str()).unwrap_or_else(|| {
     println!("Source file lacks extension");

schala-repl/src/repl/mod.rs

@@ -2,7 +2,7 @@ use std::sync::Arc;
 use std::collections::HashSet;
 
 use colored::*;
-use crate::language::{ProgrammingLanguageInterface,
+use crate::language::{ProgrammingLanguageInterface, ProgrammingLanguageStages,
 ComputationRequest, ComputationResponse,
 DebugAsk, LangMetaResponse, LangMetaRequest};
 
@@ -23,12 +23,12 @@ type InterpreterDirectiveOutput = Option<String>;
 pub struct Repl {
   pub interpreter_directive_sigil: char,
   line_reader: ::linefeed::interface::Interface<::linefeed::terminal::DefaultTerminal>,
-  language_states: Vec<Box<ProgrammingLanguageInterface>>,
+  language_states: Vec<Box<ProgrammingLanguageInterface<Stages = dyn ProgrammingLanguageStages>>>,
   options: ReplOptions,
 }
 
 impl Repl {
-  pub fn new(initial_states: Vec<Box<ProgrammingLanguageInterface>>) -> Repl {
+  pub fn new(initial_states: Vec<Box<ProgrammingLanguageInterface<Stages = dyn ProgrammingLanguageStages>>>) -> Repl {
     use linefeed::Interface;
     let line_reader = Interface::new("schala-repl").unwrap();
     let interpreter_directive_sigil = ':';
@@ -113,7 +113,7 @@ impl Repl {
     directives.perform(self, &arguments)
   }
 
-  fn get_cur_language_state(&mut self) -> &mut Box<ProgrammingLanguageInterface> {
+  fn get_cur_language_state(&mut self) -> &mut Box<ProgrammingLanguageInterface<Stages = dyn ProgrammingLanguageStages>> {
     //TODO this is obviously not complete
     &mut self.language_states[0]
   }