what even is this language sometimes

src/parse.rs

@@ -1,5 +1,7 @@
-use thiserror::Error;
+use crate::shell::Shell;
 use log::debug;
+use std::fmt;
+use thiserror::Error;
 
 #[derive(Debug, Error)]
 pub enum Error {
@@ -104,46 +106,42 @@ impl<'text> Lexer<'text> {
     }
 }
 
-struct Command {
-    // name: String,
-    args: Vec<String>,
-}
-
-impl Node for Command {
-    fn with(mut self, t: Token) -> Result<Box<dyn Node>, Error> {
-        match t {
-            Token::Ident(s) => {
-                self.args.push(s);
-                Ok(Box::new(self))
-            },
-            _ => Err(Error::UnexpectedToken),
-        }
-    }
-}
-
 struct Parser {
-
+    state: Node,
 }
 
 impl Parser {
     fn new() -> Self {
-        Self { }
+        Self {
+            state: Node::Empty,
+        }
     }
 
-    fn parse(&self, _tokens: Vec<Token>) -> Result<Tree, Error> {
-        // if tokens.is_empty() {
-        // }
-        Ok(Tree{})
+    fn parse(mut self, tokens: Vec<Token>) -> Result<Node, Error> {
+        for token in tokens {
+            match (self.state, token) {
+                (Node::Empty, Token::Ident(name)) => {
+                    self.state = Node::Command{name, args: vec!()};
+                },
+                (Node::Command{name, mut args}, Token::Ident(s)) => {
+                    args.push(s);
+                    self.state = Node::Command{name, args};
+                },
+                _ => return Err(Error::UnexpectedToken),
             }
         }
-
-#[derive(Debug)]
-pub struct Tree {
+        Ok(self.state)
+    }
 
 }
 
-trait Node {
-    fn with(self, t: Token) -> Result<Box<dyn Node>, Error>;
+#[derive(Debug)]
+pub enum Node {
+    Empty,
+    Command {
+        name: String,
+        args: Vec<String>,
+    },
 }
 
 // I don't know how to write a parser lol
@@ -171,8 +169,7 @@ trait Node {
 //     ]
 //   }
 
-
-pub fn parse<S: AsRef<str>>(text: S) -> Result<Tree, Error> {
+pub fn parse<S: AsRef<str>>(text: S) -> Result<Node, Error> {
     let tokens = lex(text)?;
     let parser = Parser::new();
     debug!("  {:?}", tokens);
@@ -255,9 +252,3 @@ mod tests {
 
 
 */
-
-
-
-
-
-

src/shell.rs

@@ -136,10 +136,4 @@ impl Shell {
             }
         }
     }
-
-    // pub fn parse(&mut self) -> (String, Vec<&str>) {
-    //     let buf = self.line.show();
-    //     let tree = parse(buf);
-    //     (String::new(), vec!())
-    // }
 }