remove let without in

Cargo.lock

@@ -13,6 +13,32 @@ dependencies = [
  "version_check",
 ]
 
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
 [[package]]
 name = "cc"
 version = "1.0.79"
@@ -35,6 +61,21 @@ dependencies = [
  "stacker",
 ]
 
+[[package]]
+name = "clap"
+version = "2.34.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0610544180c38b88101fecf2dd634b174a62eef6946f84dfc6a7127512b381c"
+dependencies = [
+ "ansi_term",
+ "atty",
+ "bitflags",
+ "strsim",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.8"
@@ -55,6 +96,30 @@ dependencies = [
  "ahash",
 ]
 
+[[package]]
+name = "heck"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6d621efb26863f0e9924c6ac577e8275e5e6b77455db64ffa6c65c904e9e132c"
+dependencies = [
+ "unicode-segmentation",
+]
+
+[[package]]
+name = "hermit-abi"
+version = "0.1.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "62b467343b94ba476dcb2500d242dadbb39557df889310ac77c5d99100aaac33"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
 [[package]]
 name = "libc"
 version = "0.2.139"
@@ -67,6 +132,39 @@ version = "1.17.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b7e5500299e16ebb147ae15a00a942af264cf3688f47923b8fc2cd5858f23ad3"
 
+[[package]]
+name = "proc-macro-error"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da25490ff9892aab3fcf7c36f08cfb902dd3e71ca0f9f9517bea02a73a5ce38c"
+dependencies = [
+ "proc-macro-error-attr",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro-error-attr"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1be40180e52ecc98ad80b184934baf3d0d29f979574e439af5a55274b35f869"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "version_check",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.51"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d727cae5b39d21da60fa540906919ad737832fe0b1c165da3a34d6548c849d6"
+dependencies = [
+ "unicode-ident",
+]
+
 [[package]]
 name = "psm"
 version = "0.1.21"
@@ -76,11 +174,21 @@ dependencies = [
  "cc",
 ]
 
+[[package]]
+name = "quote"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8856d8364d252a14d474036ea1358d63c9e6965c8e5c1885c18f73d70bff9c7b"
+dependencies = [
+ "proc-macro2",
+]
+
 [[package]]
 name = "renxi"
 version = "0.1.0"
 dependencies = [
  "chumsky",
+ "structopt",
 ]
 
 [[package]]
@@ -96,6 +204,80 @@ dependencies = [
  "winapi",
 ]
 
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+
+[[package]]
+name = "structopt"
+version = "0.3.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0c6b5c64445ba8094a6ab0c3cd2ad323e07171012d9c98b0b15651daf1787a10"
+dependencies = [
+ "clap",
+ "lazy_static",
+ "structopt-derive",
+]
+
+[[package]]
+name = "structopt-derive"
+version = "0.4.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dcb5ae327f9cc13b68763b5749770cb9e048a99bd9dfdfa58d0cf05d5f64afe0"
+dependencies = [
+ "heck",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
+dependencies = [
+ "unicode-width",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84a22b9f218b40614adcb3f4ff08b703773ad44fa9423e4e0d346d5db86e4ebc"
+
+[[package]]
+name = "unicode-segmentation"
+version = "1.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1dd624098567895118886609431a7c3b8f516e41d30e0643f03d94592a147e36"
+
+[[package]]
+name = "unicode-width"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
+
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
 [[package]]
 name = "version_check"
 version = "0.9.4"

Cargo.toml

@@ -5,3 +5,4 @@ edition = "2021"
 
 [dependencies]
 chumsky = "0.9.0"
+structopt = "0.3.26"

a.hlm

@@ -1,43 +1,15 @@
+let name: str = "john";
 println("Hello, " + name + "!");
 
-let a = 17, b = 35 in
-    let c = a * 2 in
+let a: num = 17, b: num = 35 in
+    let c: num = a * 2 in
         println(b + c);
 
-func foo (a: int, b: int) {
-    let c = a * 2;
+// func foo (a: int, b: int) {
+//     let c = a * 2;
+// 
+//     let res = b + c in
+//         return res + a;
+// }
 
-    let res = b + c in
-        return res + a;
-}
-
-println((\x: int -> x + 1)(1));
-
-──────────────────────────────────────────────────
-
-(println (+ "Hello, " name "!"))
-
-(let [a 17] [b 35]
-    (let [c (* a 2)]
-        (println (+ b c))))
-
-(func foo [a int b int] (block
-    (let [c (* a 2)])
-    (let [res (+ b c)]
-        (return (+ res a)))
-))
-
-──────────────────────────────────────────────────
-
-console.log("Hello, " + name + "!");
-
-let a = 17;
-let b = 35;
-let c = a * 2;
-console.log(b + c);
-
-const foo = (a, b) => {
-    let c = a * 2;
-    let res = b + c;
-    return res + a; 
-}
+println((\x: int -> x + 1)(1));

src/args.rs

@@ -0,0 +1,11 @@
+use std::path::PathBuf;
+use structopt::StructOpt;
+
+#[derive(Debug, StructOpt)]
+pub struct Options {
+    #[structopt(name = "FILE", parse(from_os_str))]
+    pub file: PathBuf,
+
+    #[structopt(short, long = "out", parse(from_os_str))]
+    pub output: Option<PathBuf>,
+}

src/main.rs

@@ -1,15 +1,17 @@
 #![feature(trait_alias)]
 pub mod read;
 pub mod trans;
+pub mod args;
 
 use std::io::Write;
-
+use args::Options;
 use read::parse::{lex, parse};
+use structopt::StructOpt;
 use trans::low::{translate_expr, translate_js};
 
 fn main() {
-    let path = std::env::args().nth(1).expect("No file path provided");
-    let src = std::fs::read_to_string(path).expect("Failed to read file");
+    let opt = Options::from_args();
+    let src = std::fs::read_to_string(opt.file).expect("Failed to read file");
 
     let (tokens, lex_errs) = lex(src.to_owned());
 
@@ -20,7 +22,8 @@ fn main() {
             let nexprs = ast.into_iter().map(|(e, _)| translate_expr(e)).collect::<Vec<_>>();
             let jsexprs = nexprs.into_iter().map(translate_js).collect::<Vec<_>>();
 
-            let mut file = std::fs::File::create("out.js").expect("Failed to create file");
+            let mut file = std::fs::File::create(opt.output.unwrap_or("out.js".into()))
+                .expect("Failed to create file");
             let s = jsexprs
                 .into_iter()
                 .map(|e| {

src/read/parse.rs

@@ -293,26 +293,17 @@ pub fn expr_parser() -> impl P<Spanned<PExpr>> {
         .then(expr.clone())
         .map(|(vars, body)| PExpr::Let {
             vars,
-            body: Some(Box::new(body)),
+            body: Box::new(body),
         })
         .boxed()
         .labelled("let..in");
 
-        let let_def = just(Token::Let)
-        .ignore_then(let_binds)
-        .map(|vars| PExpr::Let {
-            vars,
-            body: None,
-        })
-        .labelled("let");
-
         let atom = lit
         .or(sym)
         .or(vec)
         .or(paren_expr)
         .or(lam)
         .or(let_in)
-        .or(let_def)
         .map_with_span(|e, s| (e, s))
         .boxed()
         .labelled("atom");

src/read/past.rs

@@ -37,6 +37,6 @@ pub enum PExpr {
     },
     Let {
         vars: Vec<(String, Type, Spanned<Self>)>,
-        body: Option<Box<Spanned<Self>>>,
+        body: Box<Spanned<Self>>,
     },
 }

src/trans/ast.rs

@@ -34,7 +34,6 @@ pub enum Expr {
         args: Vec<(String, Type)>,
         body: Box<Self>,
     },
-    Define(Vec<(String, Box<Self>)>),
 }
 
 impl Display for Expr {
@@ -72,11 +71,6 @@ impl Display for Expr {
                 }
                 write!(f, " {})", body)
             },
-            Expr::Define(vars) => {
-                vars.iter().try_for_each(|(name, val)| {
-                    write!(f, "(define {} {})", name, val)
-                })
-            },
         }
     }
 }

src/trans/js.rs

@@ -19,7 +19,6 @@ pub enum JSExpr {
         args: Vec<(String, Type)>,
         body: Box<Self>,
     },
-    Let(Vec<(String, Box<Self>)>),
 }
 
 impl Display for JSExpr {
@@ -77,11 +76,6 @@ impl Display for JSExpr {
                 }
                 write!(f, ") => {})", body)
             },
-            JSExpr::Let(vars) => {
-                vars.iter().try_for_each(|(name, expr)| {
-                    write!(f, "let {} = {};", name, expr)
-                })
-            },
         }
     }
 }

src/trans/low.rs

@@ -52,34 +52,19 @@ pub fn translate_expr(expr: PExpr) -> Expr {
             body: Box::new(translate_expr((*body).0)),
         },
         PExpr::Let { vars, body } => {
-            if let Some(body) = body {
-                let mut expr: Expr = translate_expr(body.0); // The expression we're building up
-                for (name, ty, val) in vars.into_iter().rev() { // Reverse so we can build up the lambda
-                    // e.g.: let x : t = e1 in e2; => (lambda (x : t) = e2)(e1)
-
-                    // Build up the lambda
-                    expr = Expr::Lambda {
-                        args: vec![(name, ty)],
-                        body: Box::new(expr),
-                    };
-                    // Call the lambda with the value
-                    let val = translate_expr(val.0);
-                    expr = Expr::Call(Box::new(expr), vec![val]);
-                }
-
-                expr
-            } else {
-                // e.g. let a : t = 1; => (define a 1)
-                //      let a : t = 2, b : t = 3; => (define a 2) (define b 3)
-                let mut xs: Vec<(String, Box<Expr>)> = vec![];
-
-                for (name, _, val) in vars {
-                    let val = translate_expr(val.0);
-                    xs.push((name, Box::new(val)));
-                }
-
-                Expr::Define(xs)
+            let mut expr: Expr = translate_expr(body.0); // The expression we're building up
+            for (name, ty, val) in vars.into_iter().rev() { // Reverse so we can build up the lambda
+                // e.g.: let x : t = e1 in e2; => (lambda (x : t) = e2)(e1)
+                // Build up the lambda
+                expr = Expr::Lambda {
+                    args: vec![(name, ty)],
+                    body: Box::new(expr),
+                };
+                // Call the lambda with the value
+                let val = translate_expr(val.0);
+                expr = Expr::Call(Box::new(expr), vec![val]);
             }
+            expr
         }
     }
 }
@@ -143,13 +128,5 @@ pub fn translate_js(expr: Expr) -> JSExpr {
             args,
             body: Box::new(translate_js(*body)),
         },
-        Expr::Define(xs) => {
-            let ns = xs
-            .into_iter()
-            .map(|(name, val)| (name, Box::new(translate_js(*val))))
-            .collect();
-
-            JSExpr::Let(ns)
-        }
     }
 }