Start converting over directives to new format

schala-repl/src/repl/command_tree.rs

@@ -1,11 +1,11 @@
-use super::Repl;
+use super::{Repl, InterpreterDirectiveOutput};
 
 use colored::*;
 
 pub type BoxedCommandFunction = Box<(fn(&mut Repl, &[&str]) -> Option<String>)>;
 
 /// A CommandTree is either a `Terminal` or a `NonTerminal`. When command parsing reaches the first
-/// Terminal, it will use the `ReplAction` found there to find an appropriate function to execute,
+/// Terminal, it will use the `DirectiveAction` found there to find an appropriate function to execute,
 /// and then execute it with any remaining arguments
 //TODO remove function: BoxedCommandFunction
 #[derive(Clone)]
@@ -15,41 +15,49 @@ pub enum CommandTree {
     children: Vec<CommandTree>,
     help_msg: Option<String>,
     function: BoxedCommandFunction,
-    action: ReplAction,
+    action: DirectiveAction,
   },
   NonTerminal {
     name: String,
     children: Vec<CommandTree>,
     help_msg: Option<String>,
-    action: ReplAction,
+    action: DirectiveAction,
   },
   //TODO get rid of Top
   Top(Vec<CommandTree>),
 }
 
 #[derive(Debug, Clone)]
-pub enum ReplAction {
+pub enum DirectiveAction {
   Null,
   Help,
   QuitProgram
 }
 
-impl ReplAction {
-  fn get_function(&self) -> impl Fn(&mut Repl, &[&str]) -> Option<String> {
-    |_: &mut Repl, _: &[&str]| { None }
+impl DirectiveAction {
+  fn perform(&self, repl: &mut Repl, arguments: &[&str]) -> InterpreterDirectiveOutput {
+    use DirectiveAction::*;
+    match self {
+      Null => None,
+      Help => Some(repl.print_help_message(arguments)),
+      QuitProgram => {
+        repl.save_before_exit();
+        ::std::process::exit(0)
+      }
+    }
   }
 }
 
 impl CommandTree {
   pub fn nonterm_no_further_tab_completions(s: &str, help: Option<&str>) -> CommandTree {
-    CommandTree::NonTerminal {name: s.to_string(), help_msg: help.map(|x| x.to_string()), children: vec![], action: ReplAction::Null }
+    CommandTree::NonTerminal {name: s.to_string(), help_msg: help.map(|x| x.to_string()), children: vec![], action: DirectiveAction::Null }
   }
 
   pub fn terminal(s: &str, help: Option<&str>, children: Vec<CommandTree>, function: BoxedCommandFunction) -> CommandTree {
-    CommandTree::Terminal {name: s.to_string(), help_msg: help.map(|x| x.to_string()), function, children, action: ReplAction::Null }
+    CommandTree::Terminal {name: s.to_string(), help_msg: help.map(|x| x.to_string()), function, children, action: DirectiveAction::Null }
   }
 
-  pub fn terminal_act(s: &str, help: Option<&str>, children: Vec<CommandTree>, action: ReplAction) -> CommandTree {
+  pub fn terminal_act(s: &str, help: Option<&str>, children: Vec<CommandTree>, action: DirectiveAction) -> CommandTree {
     CommandTree::Terminal {name: s.to_string(), help_msg: help.map(|x| x.to_string()), function: Box::new(|_,_| { None }), children, action}
   }
 
@@ -58,7 +66,7 @@ impl CommandTree {
       name: s.to_string(),
       help_msg: help.map(|x| x.to_string()),
       children,
-      action: ReplAction::Null
+      action: DirectiveAction::Null
     }
   }
 
@@ -85,11 +93,11 @@ impl CommandTree {
     }
   }
 
-  pub fn execute(&self, repl: &mut Repl, arguments: &Vec<&str>) -> Option<String> {
+  pub fn perform(&self, repl: &mut Repl, arguments: &Vec<&str>) -> InterpreterDirectiveOutput {
     let mut dir_pointer: &CommandTree = self;
     let mut idx = 0;
 
-    let res: Result<(ReplAction, usize), String> = loop {
+    let res: Result<(DirectiveAction, usize), String> = loop {
       match dir_pointer {
         CommandTree::Top(subcommands) | CommandTree::NonTerminal { children: subcommands, .. } => {
           let next_command = match arguments.get(idx) {
@@ -111,10 +119,7 @@ impl CommandTree {
     };
 
     match res {
-      Ok((action, idx)) => {
-        let f = action.get_function();
-        f(repl, &arguments[idx..])
-      },
+      Ok((action, idx)) => action.perform(repl, &arguments[idx..]),
       Err(err) => Some(err.red().to_string())
     }
   }

schala-repl/src/repl/directives.rs

@@ -2,26 +2,19 @@ use std::fmt::Write as FmtWrite;
 use itertools::Itertools;
 
 use crate::repl::Repl;
-use crate::repl::command_tree::CommandTree;
+use crate::repl::command_tree::{CommandTree, DirectiveAction};
 use crate::language::{LangMetaRequest, LangMetaResponse, DebugAsk, DebugResponse}; 
 
+
 pub fn directives_from_pass_names(pass_names: &Vec<String>) -> CommandTree {
   let passes_directives: Vec<CommandTree> = pass_names.iter()
     .map(|pass_name| { CommandTree::nonterm_no_further_tab_completions(pass_name, None) })
     .collect();
 
   CommandTree::Top(vec![
-    CommandTree::terminal("exit", Some("exit the REPL"), vec![], Box::new(|repl: &mut Repl, _cmds: &[&str]| {
-      repl.save_before_exit();
-      ::std::process::exit(0)
-    })),
-    CommandTree::terminal("quit", Some("exit the REPL"), vec![], Box::new(|repl: &mut Repl, _cmds: &[&str]| {
-      repl.save_before_exit();
-      ::std::process::exit(0)
-    })),
-    CommandTree::terminal("help", Some("Print this help message"), vec![], Box::new(|repl: &mut Repl, cmds: &[&str]| {
-      Some(repl.print_help_message(cmds))
-    })),
+    CommandTree::terminal_act("exit", Some("exit the REPL"), vec![], DirectiveAction::QuitProgram),
+    CommandTree::terminal_act("quit", Some("exit the REPL"), vec![], DirectiveAction::QuitProgram),
+    CommandTree::terminal_act("help", Some("Print this help message"), vec![], DirectiveAction::Help),
     CommandTree::nonterm("debug",
       Some("Configure debug information"),
       vec![

schala-repl/src/repl/mod.rs

@@ -17,6 +17,8 @@ use directives::directives_from_pass_names;
 const HISTORY_SAVE_FILE: &'static str = ".schala_history";
 const OPTIONS_SAVE_FILE: &'static str = ".schala_repl";
 
+type InterpreterDirectiveOutput = Option<String>;
+
 pub struct Repl {
   interpreter_directive_sigil: char,
   line_reader: ::linefeed::interface::Interface<::linefeed::terminal::DefaultTerminal>,
@@ -101,33 +103,7 @@ impl Repl {
     self.options.save_to_file(OPTIONS_SAVE_FILE);
   }
 
-  fn get_function_from_directives<'a>(directives: &'a CommandTree, commands: &Vec<&str>) -> Result<(&'a BoxedCommandFunction, usize), String> {
-    let mut dir_pointer: &CommandTree = &directives;
-    let mut idx = 0;
-
-    loop {
-      match dir_pointer {
-        CommandTree::Top(subcommands) | CommandTree::NonTerminal { children: subcommands, .. } => {
-          let next_command = match commands.get(idx) {
-            Some(cmd) => cmd,
-            None => break Err(format!("Command requires arguments"))
-          };
-          idx += 1;
-          match subcommands.iter().find(|sc| sc.get_cmd() == *next_command) {
-            Some(command_tree) => {
-              dir_pointer = command_tree;
-            },
-            None => break Err(format!("Command {} not found", next_command))
-          };
-        },
-        CommandTree::Terminal { function, .. } => {
-          break Ok((function, idx));
-        },
-      }
-    }
-  }
-
-  fn handle_interpreter_directive(&mut self, input: &str) -> Option<String> {
+  fn handle_interpreter_directive(&mut self, input: &str) -> InterpreterDirectiveOutput {
     let mut iter = input.chars();
     iter.next();
     let arguments: Vec<&str> = iter
@@ -140,15 +116,7 @@ impl Repl {
     }
 
     let directives = self.get_directives();
-    directives.execute(self, &arguments)
-
-    /*
-    let result: Result<(&BoxedCommandFunction, _), String> = Repl::get_function_from_directives(&directives, &commands);
-    match result {
-      Ok((f, idx)) => f(self, &commands[idx..]),
-      Err(err) => Some(err.red().to_string())
-    }
-    */
+    directives.perform(self, &arguments)
   }
 
   fn print_help_message(&mut self, commands_passed_to_help: &[&str] ) -> String {