lang: first test and stuff

Cargo.lock

@@ -504,6 +504,12 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "indoc"
+version = "2.0.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b248f5224d1d606005e02c97f5aa4e88eeb230488bcc03bc9ca4d7991399f2b5"
+
 [[package]]
 name = "ir"
 version = "0.1.0"
@@ -538,6 +544,7 @@ dependencies = [
  "ego-tree",
  "enumset",
  "indexmap",
+ "indoc",
  "logos",
  "petgraph",
  "rowan",

crates/lang/Cargo.toml

@@ -15,6 +15,7 @@ ego-tree = "0.6.2"
 rowan = "0.15.15"
 drop_bomb = "0.1.5"
 enumset = "1.1.3"
+indoc = "2"
 
 [lints]
 workspace = true

crates/lang/src/parser/grammar.rs

@@ -1,6 +1,13 @@
+use std::fmt::Debug;
+
 use crate::parser::syntax_kind::SyntaxKind::*;
 
-use super::Parser;
+use super::{
+    input::Input,
+    output::Output,
+    syntax_kind::{self, lex},
+    Parser,
+};
 
 mod expression;
 
@@ -12,3 +19,16 @@ pub fn source_file(p: &mut Parser) {
 
     root.complete(p, ROOT);
 }
+
+fn check_parser(input: &str, parser_fn: fn(&mut Parser), output: &str) {
+    let toks = lex(input);
+    let mut parser = Parser::new(Input::new(&toks));
+
+    parser_fn(&mut parser);
+
+    let p_out = dbg!(parser.finish());
+    let o = Output::from_parser_output(toks, p_out);
+
+    let s = format!("{o:?}");
+    assert_eq!(&s, output);
+}

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

@@ -1,6 +1,8 @@
 use enumset::enum_set;
+use indoc::indoc;
 
 use crate::parser::{
+    grammar::check_parser,
     syntax_kind::{SyntaxKind::*, TokenSet},
     CompletedMarker, Parser,
 };
@@ -18,3 +20,40 @@ pub fn literal(p: &mut Parser) -> Option<CompletedMarker> {
 
     Some(lit.complete(p, LITERAL))
 }
+
+#[test]
+fn test_parse_lst_lit() {
+    check_parser(
+        "42",
+        |p| {
+            literal(p);
+        },
+        indoc! {r#"
+            LITERAL {
+                INT_NUM "42";
+            }
+        "#},
+    );
+    check_parser(
+        "3.14",
+        |p| {
+            literal(p);
+        },
+        indoc! {r#"
+            LITERAL {
+                FLOAT_NUM "3.14";
+            }
+        "#},
+    );
+    check_parser(
+        r#""Meow""#,
+        |p| {
+            literal(p);
+        },
+        indoc! {r#"
+            LITERAL {
+                STRING "\"Meow\"";
+            }
+        "#},
+    );
+}

testfiles/test.owo

@@ -1,4 +1 @@
-mat 2x2 [
-	1 2, 2;
-	3, 4
-]
+42