Add a very simple lisp grammer based on LALRPOP (whitespace problem)

Cargo.lock

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Cargo.toml

@@ -6,4 +6,10 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[build-dependencies]
+#lalrpop = "0.19.0"
+lalrpop = { version = "0.19.0", features = ["lexer"] }
+
 [dependencies]
+lalrpop-util = "0.19.0"
+regex = "1"

README.org

@@ -11,6 +11,7 @@ following commands to install them:
 #+BEGIN_SRC bash
 rustup component add rls --toolchain stable-x86_64-unknown-linux-gnu
 rustup component add --toolchain stable-x86_64-unknown-linux-gnu clippy
+rustup component add rustfmt
 #+END_SRC
 
 Use your desired toolchain instead of *stable-x86_64-unknown-linux-gnu*

build.rs

@@ -0,0 +1,5 @@
+extern crate lalrpop;
+
+fn main() {
+    lalrpop::process_root().unwrap();
+}

src/ast.rs

@@ -0,0 +1,37 @@
+// Note: I kept the number implementation simple for now
+// but we need to decide on our approach to numbers, are
+// we going to only support the 64bit variants? or should
+// try to be smart and support 32 and 64 and switch between
+// them ?
+// What about usize and isize ?
+#[derive(Debug, Clone)]
+pub enum Number {
+    Integer(i32),
+    Float(f32),
+}
+
+impl PartialEq for Number {
+    fn eq(&self, other: &Self) -> bool {
+        let comb = (&self, &other);
+
+        match comb {
+            (Number::Integer(x), Number::Integer(y)) => *x == *y,
+            (Number::Float(x), Number::Float(y)) => *x == *y,
+            (Number::Integer(x), Number::Float(y)) => *x as f32 == *y,
+            (Number::Float(x), Number::Integer(y)) => *x == *y as f32,
+        }
+    }
+}
+
+impl Eq for Number {}
+
+#[derive(Debug, Eq, PartialEq, Clone)]
+pub enum Expr {
+    List(Vec<Expr>),
+    Symbol(String),
+    Str(String),
+    Quote(Box<Expr>),
+    Num(Number),
+    Comment,
+    Error(String),
+}

src/collections.rs

@@ -0,0 +1 @@
+pub mod list;

src/collections/list.rs

@@ -0,0 +1,7 @@
+pub struct List {}
+
+impl List {
+    pub fn h() {
+        println!("Uo")
+    }
+}

src/grammer.lalrpop

@@ -0,0 +1,58 @@
+//! Serene's grammer based on LALRPOP which is a LR(1) parser.
+use std::str::FromStr;
+use crate::ast;
+
+grammar;
+
+// A collection of Expr objects is simply a sequence of parsed AST objects.
+pub Exprs: Vec<ast::Expr> = {
+    <v:(<Expr>)*> => v,
+};
+
+// Parse an AST expression.
+Expr: ast::Expr = {
+    // Matches a list
+    "(" <Exprs> ")" => ast::Expr::List(<>),
+
+    // Matches a vector
+    // "[" <Exprs> "]" => Ast::Vector(<>),
+
+    // Match the literal value "nil".
+    // "nil" => Ast::Nil,
+    // Match a Num term.
+    Float => ast::Expr::Num(ast::Number::Float(<>)),
+    Decimal => ast::Expr::Num(ast::Number::Integer(<>)),
+
+    // Matches a string.
+    r#""(?:[^"\\]|\\.)*""# => {
+        let val = <>;
+        ast::Expr::Str(val[1..val.len() - 1].to_owned())
+    },
+
+    // Matches a quoted expr
+    "'" <Expr> => ast::Expr::Quote(Box::new(<>)),
+
+    // Match any token and treat it as an atom.
+    Symbol => ast::Expr::Symbol(<>),
+    ! =>  ast::Expr::Error(format!("{:?}", <>)),
+};
+
+// Match any sequence of token characters.
+Symbol: String = {
+    r#"[A-Za-z_?+*/=<>-]+[0-9A-Za-z_?+*/=<>-]*"# => (<>).to_owned()
+};
+
+// Match any valid integer value and treat it as a 32-bit signed integer.
+Decimal: i32 = {
+    r"[0-9]+" => i32::from_str(<>).unwrap()
+};
+
+Float: f32 = {
+    r"[0-9]*\.[0-9]+" => f32::from_str(<>).unwrap()
+};
+
+match {
+    r"\s*" => { },
+    r";[^\n\r]*[\n\r]*" => { },
+    _
+}

src/main.rs

@@ -1,3 +1,32 @@
-fn main() {
-    println!("Hello, world!");
+#[macro_use]
+extern crate lalrpop_util;
+lalrpop_mod!(pub grammer);
+
+pub mod ast;
+pub mod collections;
+
+
+use collections::list;
+
+#[test]
+fn grammer() {
+    assert!(grammer::ExprsParser::new().parse("a22").is_ok());
+    assert!(grammer::ExprsParser::new().parse("44").is_ok());
+    assert!(grammer::ExprsParser::new().parse("is-ok").is_ok());
+    assert!(grammer::ExprsParser::new().parse("is-ok?").is_ok());
+    assert!(grammer::ExprsParser::new().parse("is-ok+<<>_").is_ok());
+    println!("{:?}", grammer::ExprsParser::new().parse("(as
+(sad asd) 3i)"));
+    assert!(true);
+    assert!(grammer::ExprsParser::new()
+        .parse("(\"asd\" (symbol (n)))")
+        .is_ok());
+    assert!(grammer::ExprsParser::new()
+        .parse("(\"asd\" (symbol (n 32)))")
+        .is_ok());
+    assert!(grammer::ExprsParser::new().parse("((22)").is_err());
+}
+
+fn main() {
+    list::List::h();
 }