From e527beea5a506fa7c6876608410316d66b127a32 Mon Sep 17 00:00:00 2001 From: Sameer Rahmani Date: Sat, 13 Jun 2020 17:55:27 +0100 Subject: [PATCH] Add a very simple lisp grammer based on LALRPOP (whitespace problem) --- Cargo.lock | 543 ++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 6 + README.org | 1 + build.rs | 5 + src/ast.rs | 37 +++ src/collections.rs | 1 + src/collections/list.rs | 7 + src/grammer.lalrpop | 58 +++++ src/main.rs | 33 ++- 9 files changed, 689 insertions(+), 2 deletions(-) create mode 100644 build.rs create mode 100644 src/ast.rs create mode 100644 src/collections.rs create mode 100644 src/collections/list.rs create mode 100644 src/grammer.lalrpop diff --git a/Cargo.lock b/Cargo.lock index 322c5d4..9406153 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1,5 +1,548 @@ # This file is automatically @generated by Cargo. # It is not intended for manual editing. +[[package]] +name = "aho-corasick" +version = "0.7.10" +source = 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= "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" diff --git a/Cargo.toml b/Cargo.toml index eb6c23d..613e526 100644 --- a/Cargo.toml +++ b/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" \ No newline at end of file diff --git a/README.org b/README.org index c19a180..924e6de 100644 --- a/README.org +++ b/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* diff --git a/build.rs b/build.rs new file mode 100644 index 0000000..23c7d3f --- /dev/null +++ b/build.rs @@ -0,0 +1,5 @@ +extern crate lalrpop; + +fn main() { + lalrpop::process_root().unwrap(); +} diff --git a/src/ast.rs b/src/ast.rs new file mode 100644 index 0000000..f2e5e28 --- /dev/null +++ b/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), + Symbol(String), + Str(String), + Quote(Box), + Num(Number), + Comment, + Error(String), +} diff --git a/src/collections.rs b/src/collections.rs new file mode 100644 index 0000000..d17e233 --- /dev/null +++ b/src/collections.rs @@ -0,0 +1 @@ +pub mod list; diff --git a/src/collections/list.rs b/src/collections/list.rs new file mode 100644 index 0000000..690ee66 --- /dev/null +++ b/src/collections/list.rs @@ -0,0 +1,7 @@ +pub struct List {} + +impl List { + pub fn h() { + println!("Uo") + } +} diff --git a/src/grammer.lalrpop b/src/grammer.lalrpop new file mode 100644 index 0000000..0c47a1e --- /dev/null +++ b/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 = { + )*> => v, +}; + +// Parse an AST expression. +Expr: ast::Expr = { + // Matches a list + "(" ")" => ast::Expr::List(<>), + + // Matches a vector + // "[" "]" => 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 + "'" => 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]*" => { }, + _ +} diff --git a/src/main.rs b/src/main.rs index e7a11a9..46305d5 100644 --- a/src/main.rs +++ b/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(); }