diagnostic crate

Cargo.lock

@@ -123,6 +123,16 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7a81dae078cea95a014a339291cec439d2f232ebe854a9d672b796c6afafa9b7"
 
+[[package]]
+name = "diagnostic"
+version = "0.1.0"
+dependencies = [
+ "ariadne",
+ "chumsky",
+ "hir",
+ "lexer",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.5"
@@ -148,6 +158,7 @@ dependencies = [
  "chumsky",
  "clap",
  "codegen",
+ "diagnostic",
  "hir",
  "lexer",
  "parser",

Cargo.toml

@@ -3,6 +3,7 @@ members = [
     "crates/main",
     "crates/lexer",
     "crates/parser",
+    "crates/diagnostic",
     "crates/hir",
     "crates/codegen",
 ]

crates/diagnostic/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "diagnostic"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+chumsky =  "0.8.0"
+ariadne = "0.1.5"
+lexer = { path = "../lexer" }
+hir = { path = "../hir" }

crates/diagnostic/src/lib.rs

@@ -0,0 +1,120 @@
+use lexer::Token;
+use chumsky::prelude::Simple;
+use ariadne::{Report, ReportKind, Label, Source, Color, Fmt};
+
+#[derive(Debug)]
+pub struct Diagnostics {
+    pub errors: Vec<Kind>,
+}
+
+#[derive(Debug)]
+pub enum Kind {
+    LexError(Simple<char>),
+    ParseError(Simple<Token>),
+    LoweringError(hir::LoweringError),
+}
+
+impl Diagnostics {
+    pub fn new() -> Self {
+        Self {
+            errors: Vec::new(),
+        }
+    }
+
+    pub fn has_error(&self) -> bool {
+        !self.errors.is_empty()
+    }
+
+    pub fn add_lex_error(&mut self, error: Simple<char>) {
+        self.errors.push(Kind::LexError(error));
+    }
+
+    pub fn add_parse_error(&mut self, error: Simple<Token>) {
+        self.errors.push(Kind::ParseError(error));
+    }
+
+    pub fn add_lowering_error(&mut self, error: hir::LoweringError) {
+        self.errors.push(Kind::LoweringError(error));
+    }
+
+    pub fn display(&self, src: String) {
+        let lex_error = self.errors.iter().filter_map(|kind| match kind {
+            Kind::LexError(error) => Some(error.clone()), // Using clone() to remove reference
+            _ => None,
+        });
+        let parse_error = self.errors.iter().filter_map(|kind| match kind {
+            Kind::ParseError(error) => Some(error.clone()), // Same case as above
+            _ => None,
+        });
+
+        // TODO: Lowering error
+        lex_error.into_iter()
+        .map(|e| e.map(|e| e.to_string()))
+        .chain(parse_error.into_iter().map(|e| e.map(|tok| tok.to_string())))
+        .for_each(|e| {
+            let report = Report::build(ReportKind::Error, (), e.span().start);
+
+            let report = match e.reason() {
+                chumsky::error::SimpleReason::Unclosed { span, delimiter } => report
+                .with_message(format!(
+                    "Unclosed delimiter {}",
+                    delimiter.fg(Color::Yellow)
+                ))
+                .with_label(
+                    Label::new(span.clone())
+                    .with_message(format!(
+                        "Expected closing delimiter {}",
+                        delimiter.fg(Color::Yellow)
+                    ))
+                    .with_color(Color::Yellow)
+                )
+                .with_label(
+                    Label::new(e.span())
+                    .with_message(format!(
+                        "Must be closed before this {}",
+                        e.found()
+                        .unwrap_or(&"end of file".to_string())
+                        .fg(Color::Red)
+                    ))
+                    .with_color(Color::Red)
+                ),
+
+                chumsky::error::SimpleReason::Unexpected => report
+                .with_message(format!(
+                    "{}, expected {}",
+
+                    if e.found().is_some() { "Unexpected token in input" }
+                    else { "Unexpected end of input" },
+
+                    if e.expected().len() == 0 { "something else".to_string().fg(Color::Green) }
+                    else {
+                        e.expected()
+                        .map(|expected| match expected {
+                            Some(expected) => expected.to_string(),
+                            None => "end of input".to_string()
+                        })
+                        .collect::<Vec<_>>()
+                        .join(", ")
+                        .fg(Color::Green)
+                    }
+                ))
+                .with_label(
+                    Label::new(e.span())
+                    .with_message(format!(
+                        "Unexpected token {}",
+                        e.found()
+                        .unwrap_or(&"EOF".to_string())
+                        .fg(Color::Red)
+                    ))
+                    .with_color(Color::Red)
+                ),
+                _ => {
+                    println!("{:?}", e);
+                    todo!();
+                }
+            };
+
+            report.finish().print(Source::from(&src)).unwrap();
+        }); // End errors reporting
+    }
+}

crates/hir/src/lib.rs

@@ -22,54 +22,108 @@ pub struct IR {
     pub span: Range<usize>
 }
 
+#[derive(Debug)]
+pub struct LoweringError {
+    pub span: Range<usize>,
+    pub message: String
+}
+
 impl IR {
     pub fn new(kind: IRKind, span: Range<usize>) -> Self {
         Self { kind, span }
     }
 }
 
-pub fn ast_to_ir(ast: Vec<(Expr, Range<usize>)>) -> Vec<IR> {
+pub fn ast_to_ir(ast: Vec<(Expr, Range<usize>)>) -> (Vec<IR>, Vec<LoweringError>) {
     let mut irs = Vec::new();
+    let mut errors = Vec::new();
     for expr in ast {
         let ir_kind = expr_to_ir(&expr.0);
-        let ir = IR::new(ir_kind, expr.1);
-        irs.push(ir);
+        if let Some(err) = ir_kind.1 {
+            errors.push(err);
+        } else {
+            irs.push(IR::new(ir_kind.0.unwrap(), expr.1));
+        }
     }
-    irs
+    (irs, errors)
 }
 
-pub fn expr_to_ir(expr: &Expr) -> IRKind {
+pub fn expr_to_ir(expr: &Expr) -> (Option<IRKind>, Option<LoweringError>) {
     match expr {
         Expr::Let { name, type_hint, value } => {
             let value = expr_to_ir(&value.0);
-            IRKind::Define { name: name.clone(), type_hint: gen_type_hint(type_hint), value: Box::new(value) }
+            if let Some(err) = value.1 {
+                // Return error
+                return (None, Some(err));
+            } else {
+                let value = value.0.unwrap(); // Unwrapping because it should always be Some
+                let ir_kind = IRKind::Define { name: name.clone(), type_hint: type_hint.clone(), value: Box::new(value) };
+                return (Some(ir_kind), None);
+            }
         },
         Expr::Call { name, args } => {
             let name = match &name.0 {
                 Expr::Identifier(s) => s.clone(),
-                _ => panic!("Expected identifier") // TODO: Remove panic and use error handling
+                // Should never happen because the parser should have caught this
+                _ => return (None, Some(LoweringError { span: name.1.clone(), message: "Expected identifier".to_string() }))
             };
-            let args = args.0.iter().map(|arg| expr_to_ir(&arg.0)).collect::<Vec<_>>();
-            IRKind::Call { name, args }
+            let mut largs = Vec::new(); // `largs` stand for lowered args
+            // Iterate over args
+            for arg in &args.0 {
+                // Lower each argument, if there is an error then return early
+                let arg = expr_to_ir(&arg.0);
+                if let Some(err) = arg.1 {
+                    return (None, Some(err));
+                } else {
+                    // Else push the lowered argument
+                    largs.push(arg.0.unwrap());
+                }
+            }
+            let ir_kind = IRKind::Call { name, args: largs };
+            return (Some(ir_kind), None);
         },
         Expr::Fun { name, type_hint, args, body } => {
+            // Iterate each argument and give it a type hint
             let args = args.0.iter().map(|arg| (arg.0.0.clone(), gen_type_hint(&arg.1.0))).collect::<Vec<_>>();
             let body = expr_to_ir(&body.0);
-            IRKind::Fun { name: name.to_string(), return_type_hint: gen_type_hint(type_hint), args, body: Box::new(body) }
+            if let Some(err) = body.1 {
+                return (None, Some(err));
+            } else {
+                let body = body.0.unwrap();
+                let ir_kind = IRKind::Fun { name: name.clone(), return_type_hint: gen_type_hint(type_hint), args, body: Box::new(body) };
+                return (Some(ir_kind), None);
+            }
         },
         Expr::Return { expr } => {
             let expr = expr_to_ir(&expr.0);
-            IRKind::Return { value: Box::new(expr) }
+            if let Some(err) = expr.1 {
+                return (None, Some(err));
+            } else {
+                let expr = expr.0.unwrap();
+                let ir_kind = IRKind::Return { value: Box::new(expr) };
+                return (Some(ir_kind), None);
+            }
         },
         Expr::Do { body } => {
-            let body = body.iter().map(|expr| expr_to_ir(&expr.0)).collect::<Vec<_>>();
-            IRKind::Do { body }
+            let mut lbody = Vec::new();
+            for expr in body {
+                let expr = expr_to_ir(&expr.0);
+                if let Some(err) = expr.1 {
+                    return (None, Some(err));
+                } else {
+                    lbody.push(expr.0.unwrap());
+                }
+            }
+            let ir_kind = IRKind::Do { body: lbody };
+            return (Some(ir_kind), None);
         },
 
-        Expr::Int(value)        => IRKind::Value { value: Value::Int(*value) },
-        Expr::Boolean(value)    => IRKind::Value { value: Value::Boolean(*value) },
-        Expr::String(value)     => IRKind::Value { value: Value::String(value.clone()) },
-        Expr::Identifier(value) => IRKind::Value { value: Value::Ident(value.clone()) },
+        // TODO: Handle primitive types error (e.g. overflow)
+        // For now it just leaves the value as is and let the target compiler handle it
+        Expr::Int(value)        => (Some(IRKind::Value { value: Value::Int(*value) }), None),
+        Expr::Boolean(value)    => (Some(IRKind::Value { value: Value::Boolean(*value) }), None),
+        Expr::String(value)     => (Some(IRKind::Value { value: Value::String(value.clone()) }), None),
+        Expr::Identifier(value) => (Some(IRKind::Value { value: Value::Ident(value.clone()) }), None),
         _ => { dbg!(expr); todo!() }
     }
 }

crates/main/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2021"
 clap = { version = "3.0.14", features = ["derive"] }
 lexer = { path = "../lexer" }
 parser = { path = "../parser" }
+diagnostic = { path = "../diagnostic" }
 hir = { path = "../hir" }
 codegen = { path = "../codegen" }
 chumsky = "0.8.0"

crates/main/src/main.rs

@@ -1,10 +1,10 @@
 use std::{fs, io::Write};
 
 use clap::Parser as ArgParser;
-use ariadne::{Report, ReportKind, Label, Source, Color, Fmt};
 
 use lexer::lex;
 use parser::parse;
+use diagnostic::Diagnostics;
 use hir::ast_to_ir;
 use codegen::cpp;
 
@@ -39,84 +39,31 @@ fn main() {
             let (tokens, lex_error) = lex(src.clone());
             let (ast, parse_error) = parse(tokens.unwrap(), src.chars().count());
 
-            // Report errors
-            lex_error.into_iter()
-                .map(|e| e.map(|e| e.to_string()))
-                .chain(parse_error.into_iter().map(|e| e.map(|tok| tok.to_string())))
-                .for_each(|e| {
-                    let report = Report::build(ReportKind::Error, (), e.span().start);
+            let mut diagnostics = Diagnostics::new();
+            for err in lex_error   { diagnostics.add_lex_error(err);   }
+            for err in parse_error { diagnostics.add_parse_error(err); }
 
-                    let report = match e.reason() {
-                        chumsky::error::SimpleReason::Unclosed { span, delimiter } => report
-                            .with_message(format!(
-                                "Unclosed delimiter {}",
-                                delimiter.fg(Color::Yellow)
-                            ))
-                            .with_label(
-                                Label::new(span.clone())
-                                    .with_message(format!(
-                                        "Expected closing delimiter {}",
-                                        delimiter.fg(Color::Yellow)
-                                    ))
-                                    .with_color(Color::Yellow)
-                            )
-                            .with_label(
-                                Label::new(e.span())
-                                    .with_message(format!(
-                                        "Must be closed before this {}",
-                                        e.found()
-                                            .unwrap_or(&"end of file".to_string())
-                                            .fg(Color::Red)
-                                    ))
-                                    .with_color(Color::Red)
-                            ),
-
-                        chumsky::error::SimpleReason::Unexpected => report
-                            .with_message(format!(
-                                "{}, expected {}",
-
-                                if e.found().is_some() { "Unexpected token in input" }
-                                else { "Unexpected end of input" },
-
-                                if e.expected().len() == 0 { "something else".to_string().fg(Color::Green) }
-                                else {
-                                    e.expected()
-                                        .map(|expected| match expected {
-                                            Some(expected) => expected.to_string(),
-                                            None => "end of input".to_string()
-                                        })
-                                        .collect::<Vec<_>>()
-                                        .join(", ")
-                                        .fg(Color::Green)
-                                }
-                            ))
-                            .with_label(
-                                Label::new(e.span())
-                                    .with_message(format!(
-                                        "Unexpected token {}",
-                                        e.found()
-                                            .unwrap_or(&"EOF".to_string())
-                                            .fg(Color::Red)
-                                    ))
-                                    .with_color(Color::Red)
-                            ),
-                        _ => {
-                            println!("{:?}", e);
-                            todo!();
-                        }
-                    };
-
-                    report.finish().print(Source::from(&src)).unwrap();
-                }
-            ); // End errors reporting
-            logif!(0, format!("Parsing took {}ms", start.elapsed().as_millis()));
+            if diagnostics.has_error() {
+                diagnostics.display(src);
+                logif!(0, "Epic parsing fail");
+                std::process::exit(1);
+            } else {
+                logif!(0, format!("Parsing took {}ms", start.elapsed().as_millis()));
+            }
 
             match ast {
                 Some(ast) => {
                     // Convert the AST to HIR
-                    let ir = ast_to_ir(ast);
-                    logif!(0, "Generated HIR.");
-                    
+                    let (ir, lowering_error) = ast_to_ir(ast);
+                    for err in lowering_error { diagnostics.add_lowering_error(err); }
+                    if diagnostics.has_error() {
+                        diagnostics.display(src);
+                        logif!(0, "Epic Lowering(HIR) fail");
+                        std::process::exit(1);
+                    } else {
+                        logif!(0, format!("Lowering took {}ms", start.elapsed().as_millis()));
+                    }
+
                     // Generate code
                     let mut codegen = cpp::Codegen::new();
                     codegen.gen(ir);
@@ -137,7 +84,7 @@ fn main() {
                     logif!(0, format!("Wrote output to `{}`. All done.", output_path.display()));
                 },
                 None => {
-                    logif!(2, "Failed to parse.");
+                    unreachable!();
                 }
             }
         }

example/err.hades

@@ -0,0 +1,2 @@
+-- Can't use Int as identifier
+let 123 = 123;