crates/lang/src/parser.rs

@@ -94,6 +94,7 @@ impl Marker {
             bomb: DropBomb::new("Marker must be completed or abandoned"),
         }
     }
+
     pub(crate) fn complete(mut self, p: &mut Parser<'_, '_>, kind: SyntaxKind) -> CompletedMarker {
         self.bomb.defuse();
         match &mut p.events[self.pos] {
@@ -108,6 +109,11 @@ impl Marker {
         }
     }
 
+    pub(crate) fn complete_err(mut self, p: &mut Parser, kind: SyntaxError) -> CompletedMarker {
+        p.errors.push(kind);
+        self.complete(p, SyntaxKind::PARSE_ERR)
+    }
+
     pub(crate) fn abandon(mut self, p: &mut Parser<'_, '_>) {
         self.bomb.defuse();
         if self.pos == p.events.len() - 1 {

crates/lang/src/parser/grammar/expression.rs

@@ -1,14 +1,62 @@
-use crate::parser::{syntax_kind::SyntaxKind::*, Parser};
+use crate::parser::{syntax_kind::SyntaxKind::*, CompletedMarker, Parser};
 
-use self::{instruction::instr, lit::literal};
+use self::{collection::collection, instruction::instr, lit::literal};
 
 mod instruction;
 mod lit;
+mod collection {
+    use enumset::enum_set;
 
-pub fn expression(p: &mut Parser) {
+    use crate::parser::{
+        syntax_kind::{SyntaxKind::*, TokenSet},
+        CompletedMarker, Parser,
+    };
+
+    use self::{attr_set::attr_set, matrix::matrix, vec::vec};
+
+    const COLLECTION_START: TokenSet = enum_set!(MAT_KW | L_BRACK | L_BRACE);
+
+    pub fn collection(p: &mut Parser) -> Option<CompletedMarker> {
+        if !COLLECTION_START.contains(p.current()) {
+            return None;
+        }
+
+        Some(match p.current() {
+            MAT_KW => matrix(p),
+            L_BRACK => vec(p),
+            L_BRACE => attr_set(p),
+            _ => unreachable!(),
+        })
+    }
+
+    mod matrix;
+    mod vec {
+        use crate::parser::{CompletedMarker, Parser};
+
+        pub fn vec(p: &mut Parser) -> CompletedMarker {
+            todo!()
+        }
+    }
+    mod attr_set {
+        use crate::parser::{CompletedMarker, Parser};
+
+        pub fn attr_set(p: &mut Parser) -> CompletedMarker {
+            todo!()
+        }
+    }
+}
+
+pub fn expression(p: &mut Parser) -> Option<CompletedMarker> {
     let expr = p.start();
 
-    instr(p);
-
-    expr.complete(p, EXPR);
+    if atom(p).or_else(|| instr(p)).is_none() {
+        expr.abandon(p);
+        return None;
+    }
+
+    Some(expr.complete(p, EXPR))
+}
+
+pub fn atom(p: &mut Parser) -> Option<CompletedMarker> {
+    literal(p).or_else(|| collection(p))
 }

crates/lang/src/parser/grammar/expression/collection/matrix.rs

@@ -0,0 +1,69 @@
+use crate::parser::{
+    error::SyntaxError,
+    grammar::expression::{self, expression},
+    syntax_kind::SyntaxKind::*,
+    CompletedMarker, Marker, Parser,
+};
+
+pub fn matrix(p: &mut Parser) -> CompletedMarker {
+    let matrix = p.start();
+    p.eat(MAT_KW);
+
+    if !p.eat(PAT_DIMENSIONS) {
+        eprintln!("TODO (as eprintln so i dont forget): improve recovery algorithms");
+        return matrix.complete_err(p, SyntaxError::Expected(vec![PAT_DIMENSIONS]));
+    }
+
+    matrix_body(p);
+
+    matrix.complete(p, MATRIX)
+}
+
+fn matrix_body(p: &mut Parser) {
+    let mat_body = p.start();
+    if !p.eat(L_BRACK) {
+        mat_body.complete_err(p, SyntaxError::Expected(vec![MAT_BODY]));
+        return ();
+    }
+
+    let mut going = true;
+
+    let mut mat_row = p.start();
+    let mut row_items = 0;
+    while going {
+        let mat_item = p.start();
+        if expression(p).is_some() {
+            mat_item.complete(p, MAT_ITEM);
+            row_items += 1;
+            match p.current() {
+                COMMA => p.do_bump(),
+                SEMICOLON => {
+                    mat_row.complete(p, MAT_ROW);
+                    mat_row = p.start();
+                    p.do_bump();
+                    row_items = 0;
+                }
+                R_BRACK => going = false,
+                _ => {
+                    let err = p.start();
+                    p.do_bump();
+
+                    err.complete_err(p, SyntaxError::Expected(vec![COMMA, SEMICOLON, R_BRACK]));
+                }
+            };
+        } else if p.at(R_BRACK) {
+            going = false;
+        } else {
+            let err = p.start();
+            p.do_bump();
+            err.complete_err(p, SyntaxError::Expected(vec![EXPR, R_BRACK]));
+        }
+    }
+    if row_items != 0 {
+        mat_row.complete(p, MAT_ROW);
+    } else {
+        mat_row.abandon(p);
+    }
+    p.eat(R_BRACK);
+    mat_body.complete(p, MAT_BODY);
+}

crates/lang/src/parser/grammar/expression/instruction.rs

@@ -1,14 +1,18 @@
-use crate::parser::{syntax_kind::SyntaxKind::*, Parser};
+use crate::parser::{syntax_kind::SyntaxKind::*, CompletedMarker, Parser};
 
 use super::lit::literal;
 
-pub fn instr(p: &mut Parser) {
+pub fn instr(p: &mut Parser) -> Option<CompletedMarker> {
+    if !p.at(IDENT) {
+        return None;
+    }
+
     let instr = p.start();
 
     instr_name(p);
     instr_params(p);
 
-    instr.complete(p, INSTR);
+    Some(instr.complete(p, INSTR))
 }
 
 fn instr_name(p: &mut Parser) {

crates/lang/src/parser/syntax_kind.rs

@@ -34,9 +34,11 @@ pub enum SyntaxKind {
     #[regex(r#""([^"\\]|\\["\\bnfrt]|u[a-fA-F0-9]{4})*""#)]
     STRING,
     MATRIX,
+    MAT_BODY,
+    MAT_ROW,
+    MAT_ITEM,
     DECL,
     LIST,
-    MAT_BODY,
     PARENTHESIZED_EXPR,
     EXPR,
     LITERAL,
@@ -45,9 +47,9 @@ pub enum SyntaxKind {
     #[token(")")]
     R_PAREN,
     #[token("{")]
-    L_CURLY,
+    L_BRACE,
     #[token("}")]
-    R_CURLY,
+    R_BRACE,
     #[token("[")]
     L_BRACK,
     #[token("]")]

testfiles/test.owo

@@ -1 +1,4 @@
-hello world test 1.5 42 69 "gay" 
+mat 2x2 [
+	1, 2;
+	3, 4
+]