Add basic unit tests

src/ast/parser.rs

@@ -12,8 +12,10 @@ pub enum ASTParsingError {
 }
 
 impl std::fmt::Display for ASTParsingError {
-	fn fmt(&self, _f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-		todo!()
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		match *self {
+			Self::UnmatchedBrace => write!(f, "Unmatched brace"),
+		}
 	}
 }
 impl std::error::Error for ASTParsingError {}

src/error.rs

@@ -37,3 +37,37 @@ impl<'a> From<&'a OwnedLocation> for Location<'a> {
 pub trait ErrorWithLocation: Error {
 	fn get_location(&self) -> Location;
 }
+
+#[derive(Debug)]
+pub struct ErrorLocationWrapper<T: Error> {
+	inner: T,
+	location: OwnedLocation,
+}
+
+impl<T: Error> ErrorLocationWrapper<T> {
+	pub fn new(inner: T, location: OwnedLocation) -> Self {
+		Self { inner, location }
+	}
+}
+
+impl<T: std::error::Error> ErrorWithLocation for ErrorLocationWrapper<T> {
+	fn get_location(&self) -> Location {
+		(&self.location).into()
+	}
+}
+
+impl<T: Error> std::fmt::Display for ErrorLocationWrapper<T> {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		write!(
+			f,
+			"An error occured: {} \n On line: {}, col: {}",
+			self.inner, self.location.line, self.location.col
+		)
+	}
+}
+
+impl<T: Error> Error for ErrorLocationWrapper<T> {
+	fn cause(&self) -> Option<&dyn Error> {
+		Some(&self.inner)
+	}
+}

src/interpreter/ast_walker.rs

@@ -1,9 +1,18 @@
+use std::fmt::Display;
+
 use super::types;
 use crate::ast::astnode::{self, UnaryOperator};
 
 #[derive(Debug)]
 pub struct RuntimeError;
 
+impl Display for RuntimeError {
+	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+		write!(f, "A runtime error occured")
+	}
+}
+impl std::error::Error for RuntimeError {}
+
 pub trait Interpret {
 	fn interpret(&self) -> Result<types::Value, RuntimeError>;
 }

src/lexer/error.rs

@@ -2,29 +2,7 @@ use crate::error::{ErrorWithLocation, Location, OwnedLocation};
 use core::fmt;
 use std::error::Error;
 
-#[derive(Debug)]
-pub struct LexingError {
-	pub location: OwnedLocation,
-	pub kind: LexingErrorKind,
-}
-
-impl fmt::Display for LexingError {
-	fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-		write!(f, "Error: {}", self.kind)
-	}
-}
-
-impl ErrorWithLocation for LexingError {
-	fn get_location<'a>(&'a self) -> Location<'a> {
-		(&self.location).into()
-	}
-}
-
-impl Error for LexingError {
-	fn source(&self) -> Option<&(dyn Error + 'static)> {
-		Some(&self.kind)
-	}
-}
+pub type LexingError = crate::error::ErrorLocationWrapper<LexingErrorKind>;
 
 #[derive(Debug)]
 pub enum LexingErrorKind {

src/lexer/mod.rs

@@ -68,6 +68,10 @@ impl<'a, 'b> Lexer<'a, 'b> {
 		self.get_token(token_type)
 	}
 
+	fn get_error(&self, error: LexingErrorKind) -> LexingError {
+		LexingError::new(error, self.source_iter.get_location(self.file).into())
+	}
+
 	fn scan_token(&mut self) -> Option<Result<Token<'b>, LexingError>> {
 		Some(Ok(match self.source_iter.next()? {
 			'(' => self.get_token(token::TokenType::LeftParen),
@@ -103,11 +107,8 @@ impl<'a, 'b> Lexer<'a, 'b> {
 			),
 			'"' => {
 				let mut string = String::new();
-				let unmatched_char_error = Some(Err(LexingError {
-					kind: LexingErrorKind::UnmatchedQuote,
-					location: self.source_iter.get_location(self.file).into(),
-				}));
-
+				let unmatched_char_error =
+					Some(Err(self.get_error(LexingErrorKind::UnmatchedQuote)));
 				loop {
 					let next_char = self.source_iter.next();
 					match next_char {
@@ -156,12 +157,7 @@ impl<'a, 'b> Lexer<'a, 'b> {
 			}
 			// Ignore whitespace
 			' ' | '\r' | '\t' | '\n' => return None,
-			c => {
-				return Some(Err(LexingError {
-					location: self.source_iter.get_location(self.file).into(),
-					kind: LexingErrorKind::UnexpectedCharacter(c),
-				}))
-			}
+			c => return Some(Err(self.get_error(LexingErrorKind::UnexpectedCharacter(c)))),
 		}))
 	}
 }

src/lib.rs

@@ -0,0 +1,62 @@
+pub mod ast;
+pub mod error;
+pub mod interpreter;
+pub mod lexer;
+
+use interpreter::ast_walker::Interpret;
+use interpreter::types::Value;
+use lexer::Lexer;
+
+pub fn run(code: &str) -> Result<Value, run::Error> {
+	let mut lexer = Lexer::new(code, None);
+	let tokens = lexer.scan_tokens()?;
+
+	let mut parser = crate::ast::parser::Parser::new(tokens.into_iter());
+	let expressions = parser.scan_expressions()?;
+
+	Ok(expressions[0].interpret()?)
+}
+
+mod run {
+	use std::fmt::Display;
+
+	use super::ast;
+	use super::interpreter::ast_walker::RuntimeError;
+	use super::lexer;
+	use from_variants::FromVariants;
+
+	#[derive(Debug, FromVariants)]
+	pub enum Error {
+		Lexing(Vec<lexer::LexingError>),
+		ASTParsing(Vec<ast::parser::ASTParsingError>),
+		Runtime(RuntimeError),
+	}
+
+	impl Display for Error {
+		fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+			let error_kind = match *self {
+				Error::Lexing(_) => "lexing",
+				Error::ASTParsing(_) => "ast generation",
+				Error::Runtime(_) => "runtime",
+			};
+			write!(f, "Errors occured during {error_kind}\n")?;
+			match *self {
+				Error::Lexing(ref errors) => {
+					for error in errors {
+						write!(f, "{error} \n")?;
+					}
+				}
+				Error::ASTParsing(ref errors) => {
+					for error in errors {
+						write!(f, "{error} \n")?;
+					}
+				}
+				Error::Runtime(ref error) => write!(f, "{error} \n")?,
+			};
+
+			Ok(())
+		}
+	}
+
+	impl std::error::Error for Error {}
+}

src/main.rs

@@ -1,10 +1,4 @@
-mod ast;
-mod error;
-mod interpreter;
-mod lexer;
-
-use interpreter::ast_walker::Interpret;
-use lexer::Lexer;
+use crftng_intrprtrs::run;
 use std::{fs, io, path};
 use tracing::Level;
 use tracing_subscriber::{EnvFilter, FmtSubscriber};
@@ -27,7 +21,10 @@ fn run_repl() {
 
 				let line = line_buf.trim();
 				if !line.is_empty() {
-					run(line).unwrap();
+					match run(line) {
+						Ok(v) => println!("{:?}", v),
+						Err(e) => println!("{}", e),
+					}
 					line_buf.clear();
 				}
 			}
@@ -36,18 +33,6 @@ fn run_repl() {
 	}
 }
 
-fn run(code: &str) -> Result<(), Vec<lexer::LexingError>> {
-	let mut lexer = Lexer::new(code, None);
-	let tokens = lexer.scan_tokens()?;
-	println!("{:?}", tokens);
-	let mut parser = crate::ast::parser::Parser::new(tokens.into_iter());
-	let expressions = parser.scan_expressions().unwrap();
-	println!("{:?}", expressions);
-	println!("{:?}", expressions[0].interpret());
-
-	Ok(())
-}
-
 fn main() {
 	dotenv::dotenv().ok();
 	color_eyre::install().expect("Failed to install color-eyre");

tests/integration_test.rs

@@ -0,0 +1,17 @@
+use crftng_intrprtrs::run;
+use crftng_intrprtrs::interpreter::types;
+
+#[test]
+fn test_one_equality() {
+	run_check_result_eq_bool("1 == 1", true);
+	run_check_result_eq_bool("1 >= 1", true);
+	run_check_result_eq_bool("1 <= 1", true);
+	run_check_result_eq_bool("1 != 1", false);
+	run_check_result_eq_bool("1 > 1", false);
+	run_check_result_eq_bool("1 < 1", false);
+}
+
+fn run_check_result_eq_bool(code: &str, value: bool) {
+	assert_eq!(run(code).unwrap(), types::Value::Primitive(types::Primitive::Bool(value)))
+
+}