Functionality

src/executor.rs

@@ -1,6 +1,6 @@
-use std::collections::HashMap;
+use std::{collections::HashMap, fmt};
 
-use crate::{OpCode, LispValue};
+use crate::PreLispValue;
 
 pub struct LispState {
 	table: HashMap<String, LispValue>,
@@ -10,6 +10,54 @@ fn add_function<T: Into<String> + Clone>(table: &mut HashMap<String, LispValue>,
 	table.insert(name.clone().into(), LispValue::RustFunction(name.into(), func));
 }
 
+#[derive(Debug, Clone)]
+pub enum LispValue {
+	Nil,
+	String(String),
+	Integer(i32),
+	Float(f32),
+	List(Vec<LispValue>, bool),
+	LispFunction(String, Vec<LispValue>),
+	RustFunction(String, fn(Vec<LispValue>) -> Vec<LispValue>),
+}
+
+impl fmt::Display for LispValue {
+	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+		match self {
+			LispValue::Nil => write!(f, "nil"),
+			LispValue::String(str) => write!(f, "{}", str),
+			LispValue::LispFunction(name, _) => write!(f, "<'{}': Lisp Function>", name),
+			LispValue::RustFunction(name, _) => write!(f, "<'{}': Rust Function>", name),
+			LispValue::Integer(num) => write!(f, "{}", num),
+			LispValue::Float(num) => write!(f, "{}", num),
+			val => {
+				write!(f, "{}", format!("{:?}", val))
+			}
+		}
+	}
+}
+
+impl From<&str> for LispValue {
+	fn from(value: &str) -> Self {
+		LispValue::String(value.to_string())
+	}
+}
+impl From<String> for LispValue {
+	fn from(value: String) -> Self {
+		LispValue::String(value)
+	}
+}
+impl From<i32> for LispValue {
+	fn from(value: i32) -> Self {
+		LispValue::Integer(value)
+	}
+}
+impl From<f32> for LispValue {
+	fn from(value: f32) -> Self {
+		LispValue::Float(value)
+	}
+}
+
 impl LispState {
 	pub fn new() -> LispState {
 		let mut table = HashMap::new();
@@ -281,47 +329,73 @@ impl LispState {
 		}
 	}
 
-	fn do_call(&self, opcode: &OpCode) -> Vec<LispValue> {
-		if let OpCode::Call(func, args) = opcode {
-			let f = self.table.get(func).unwrap();
+	fn handle_prevalues(&self, input: Vec<PreLispValue>) -> Vec<LispValue> {
+		let mut out = Vec::new();
 
-			let mut args: Vec<LispValue> = args.clone();
-			for i in 0..args.len() {
-				let arg = &args[i];
-				if let LispValue::Eval(OpCode::Exp(opcodes)) = arg {
-					if opcodes.len() < 1 {
-						args[i] = LispValue::Nil;
-						continue;
-					}
+		for v in input {
+			out.push(match v {
+				PreLispValue::Nil => LispValue::Nil,
+				PreLispValue::String(str) => LispValue::String(str),
+				PreLispValue::Integer(num) => LispValue::Integer(num),
+				PreLispValue::Float(num) => LispValue::Float(num),
+				PreLispValue::List(list, quoted) => {
+					LispValue::List(Self::handle_prevalues(self, list), quoted)
+				},
+				PreLispValue::LispFunction(name, instructions) => {
+					LispValue::LispFunction(name, Self::handle_prevalues(self, instructions))
+				},
+				PreLispValue::Var(name) => {
+					self.table.get(&name).unwrap_or(&LispValue::Nil).to_owned()
+				}
+			})
+		}
 
-					let call_opcode = opcodes.last().unwrap();
-					let mut res = self.do_call(call_opcode);
-					args.remove(i);
-					for j in 0..res.len() {
-						args.insert(i + j, res.remove(0));
+		out
+	}
+
+	fn eval_list(list: &Vec<LispValue>, quoted: bool) -> (Vec<LispValue>, bool) {
+		if list.len() < 1 {
+			return (vec![LispValue::List(Vec::new(), quoted)], false);
+		}
+
+		let list = &mut list.clone();
+
+		for i in 0..list.len() {
+			if let LispValue::List(elements, quoted) = &list[i] {
+				let (elems, astuple) = Self::eval_list(elements, *quoted);
+				if astuple {
+					list[i] = elems.get(0).unwrap_or(&LispValue::Nil).to_owned();
+					for j in 1..elems.len() {
+						list.insert(i, elems[j].to_owned());
 					}
+				} else {
+					list[i] = LispValue::List(elems, *quoted);
 				}
 			}
-			if let LispValue::RustFunction(_, f) = f {
-				return f(args.to_vec());
-			} else {
-				todo!();
-			}
+		}
 
+		if quoted {
+			return (list.to_vec(), false);
+		}
+
+		if let LispValue::RustFunction(_name, f) = &list[0] {
+			(f(list[1..].to_vec()), true)
+		} else if let LispValue::LispFunction(_name, ins) = &list[0] {
+			(Self::call_lisp_func(&list[0], list[1..].to_vec()), true)
 		} else {
-			panic!("Bad OpCode: expected OpCode::Call")
+			(list.to_vec(), false)
 		}
 	}
 
-	pub fn execute(&self, instructions: Vec<OpCode>) {
-		for op in instructions {
-			match op {
-				OpCode::Call(func, args) => {
-					self.do_call(&OpCode::Call(func, args));
-				},
-				OpCode::Exp(ins) =>  {
-					self.execute(ins);
-				}
+	fn call_lisp_func(f: &LispValue, args: Vec<LispValue>) -> Vec<LispValue> {
+		todo!()
+	}
+
+	pub fn execute(&self, instructions: Vec<PreLispValue>) {
+		let instructions = Self::handle_prevalues(self, instructions);
+		for val in instructions {
+			if let LispValue::List(elements, quoted) = val {
+				Self::eval_list(&elements, quoted);
 			}
 		}
 	}

src/main.rs

@@ -9,6 +9,7 @@ use executor::*;
 
 fn main() {
     let source = std::fs::read_to_string("src/test.lisp").unwrap();
+
     let mut tokenizer = Tokenizer::new(source);
 	let tokens = match tokenizer.tokenize() {
 		Ok(tokens) => tokens,

src/parser.rs

@@ -3,54 +3,53 @@ use std::fmt;
 use crate::Token;
 
 #[derive(Debug, Clone)]
-pub enum LispValue {
+pub enum PreLispValue {
 	Nil,
 	String(String),
+	Var(String),
 	Integer(i32),
 	Float(f32),
-	LispFunction(String, Vec<OpCode>),
-	RustFunction(String, fn(Vec<LispValue>) -> Vec<LispValue>),
-	Ref(String),
-	Eval(OpCode)
+	List(Vec<PreLispValue>, bool), // Values, Quoted
+	LispFunction(String, Vec<PreLispValue>),
 }
 
-impl fmt::Display for LispValue {
+impl fmt::Display for PreLispValue {
 	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 		match self {
-			LispValue::Nil => write!(f, "nil"),
-			LispValue::String(str) => write!(f, "{}", str),
-			LispValue::LispFunction(name, _) => write!(f, "<'{}': Lisp Function>", name),
-			LispValue::RustFunction(name, _) => write!(f, "<'{}': Rust Function>", name),
-			LispValue::Integer(num) => write!(f, "{}", num),
-			LispValue::Float(num) => write!(f, "{}", num),
-			LispValue::Ref(name) => write!(f, "<'{}': Reference>", name),
+			PreLispValue::Nil => write!(f, "nil"),
+			PreLispValue::String(str) => write!(f, "{}", str),
+			PreLispValue::LispFunction(name, _) => write!(f, "<'{}': Lisp Function>", name),
+			PreLispValue::Integer(num) => write!(f, "{}", num),
+			PreLispValue::Float(num) => write!(f, "{}", num),
 			_ => todo!()
 		}
 	}
 }
 
-impl From<&str> for LispValue {
+impl From<&str> for PreLispValue {
 	fn from(value: &str) -> Self {
-		LispValue::String(value.to_string())
+		PreLispValue::String(value.to_string())
 	}
 }
-
-impl From<String> for LispValue {
+impl From<String> for PreLispValue {
 	fn from(value: String) -> Self {
-		LispValue::String(value)
+		PreLispValue::String(value)
 	}
 }
-
-impl From<i32> for LispValue {
+impl From<i32> for PreLispValue {
 	fn from(value: i32) -> Self {
-		LispValue::Integer(value)
+		PreLispValue::Integer(value)
 	}
 }
-
-#[derive(Debug, Clone)]
-pub enum OpCode {
-	Call(String, Vec<LispValue>),
-	Exp(Vec<OpCode>)
+impl From<f32> for PreLispValue {
+	fn from(value: f32) -> Self {
+		PreLispValue::Float(value)
+	}
+}
+impl From<Vec<PreLispValue>> for PreLispValue {
+	fn from(value: Vec<PreLispValue>) -> Self {
+		PreLispValue::List(value, false)
+	}
 }
 
 // TODO: Handle failure
@@ -83,60 +82,64 @@ fn read_exp(open_paren_idx: usize, tokens: &Vec<Token>) -> Option<(Vec<Token>, u
 	None
 }
 
-fn parse_exp(tokens: Vec<Token>) -> Vec<OpCode> {
-	let mut opcodes = Vec::new();
+fn parse_exp(tokens: Vec<Token>, quoted: bool) -> PreLispValue {
+	let mut values = Vec::new();
 	
 	if tokens.len() < 1 {
-		return opcodes;
+		return PreLispValue::List(values, false);
 	}
 
-	if let Token::Identifier(name) = &tokens[0] {
-		let mut args = Vec::new();
+	let mut quote_next_list = false;
+	let mut unquote_next_list = false;
 		
-		let mut i = 1;
-		while i < tokens.len() {
-			let tkn = &tokens[i];
-			match tkn {
-				Token::OpenParen => {
-					let (tkns, close_paren_idx) = read_exp(i, &tokens).unwrap();
-					args.push(LispValue::Eval(OpCode::Exp(parse_exp(tkns))));
-					i = close_paren_idx;
-				},
-				Token::Identifier(name) => {
-					args.push(LispValue::Ref(name.to_owned()));
-				},
-				Token::Integer(num) => {
-					args.push(LispValue::Integer(*num));
-				},
-				Token::Float(num) => {
-					args.push(LispValue::Float(*num));
-				},
-				Token::String(str) => {
-					args.push(LispValue::String(str.to_owned()));
-				},
-				Token::CloseParen => {
-					panic!("Unexpected closing parenthesis");
-				},
+	let mut i = 0;
+	while i < tokens.len() {
+		let tkn = &tokens[i];
+		match tkn {
+			Token::Quote => {
+				quote_next_list = true;
+			},
+			Token::Unquote => {
+				unquote_next_list = true;
 			}
-
-			i += 1;
+			Token::OpenParen => {
+				let (tkns, close_paren_idx) = read_exp(i, &tokens).unwrap();
+				values.push(parse_exp(tkns, if unquote_next_list {false} else {quote_next_list || quoted}));
+				i = close_paren_idx;
+				quote_next_list = false;
+				unquote_next_list = false;
+			},
+			Token::Identifier(name) => {
+				values.push(PreLispValue::Var(name.to_owned()));
+			},
+			Token::Integer(num) => {
+				values.push(PreLispValue::Integer(*num));
+			},
+			Token::Float(num) => {
+				values.push(PreLispValue::Float(*num));
+			},
+			Token::String(str) => {
+				values.push(PreLispValue::String(str.to_owned()));
+			},
+			Token::CloseParen => {
+				panic!("Unexpected closing parenthesis");
+			},
 		}
-
-		opcodes.push(OpCode::Call(name.to_owned(), args))
+		i += 1;
 	}
 
-	opcodes
+	PreLispValue::List(values, quoted)
 }
 
-pub fn parse(tokens: Vec<Token>) -> Vec<OpCode> {
-	let mut opcodes = Vec::new();
+pub fn parse(tokens: Vec<Token>) -> Vec<PreLispValue> {
+	let mut values = Vec::new();
 	
 	let mut i = 0;
 	while i < tokens.len() {
 		match &tokens[i] {
 			Token::OpenParen => {
 				let (tkns, close_paren_idx) = read_exp(i, &tokens).unwrap();
-				opcodes.push(OpCode::Exp(parse_exp(tkns)));
+				values.push(parse_exp(tkns, false));
 				i = close_paren_idx;
 			}
 			tkn => {
@@ -147,5 +150,5 @@ pub fn parse(tokens: Vec<Token>) -> Vec<OpCode> {
 		i += 1;
 	}
 
-	opcodes
+	values
 }

src/test.lisp

@@ -11,4 +11,4 @@
 ;			LispValue::Float(1.0),
 ;			LispValue::Integer(3)
 ;		})
-;	})
+;	})

src/tokenizer.rs

@@ -4,6 +4,8 @@ use std::fmt;
 pub enum Token {
 	OpenParen,
 	CloseParen,
+	Quote,
+	Unquote,
 	Identifier(String),
 	String(String),
 	Integer(i32),
@@ -113,6 +115,8 @@ impl Tokenizer {
 						tokens.push(Token::Integer(self.storage.iter().collect::<String>().parse().unwrap()));
 					}
 
+					self.is_float = false;
+
 					self.storage.clear();
 				} else {
 					if char == '.' {
@@ -164,6 +168,8 @@ impl Tokenizer {
 					self.reading_string = true;
 					self.storage.clear();
 				},
+				'\'' => tokens.push(Token::Quote),
+				',' => tokens.push(Token::Unquote),
 				c => {
 					if c.is_alphabetic() {
 						self.reading_identifier = true;