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This commit is contained in:
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|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
|
||||
[[package]]
|
||||
name = "windows-sys"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
|
||||
dependencies = [
|
||||
"windows_aarch64_msvc",
|
||||
"windows_i686_gnu",
|
||||
"windows_i686_msvc",
|
||||
"windows_x86_64_gnu",
|
||||
"windows_x86_64_msvc",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "windows_aarch64_msvc"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_gnu"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
|
||||
|
||||
[[package]]
|
||||
name = "windows_i686_msvc"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "e2e7917148b2812d1eeafaeb22a97e4813dfa60a3f8f78ebe204bcc88f12f024"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_gnu"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
|
||||
|
||||
[[package]]
|
||||
name = "windows_x86_64_msvc"
|
||||
version = "0.36.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
|
||||
13
Cargo.toml
Normal file
13
Cargo.toml
Normal file
|
|
@ -0,0 +1,13 @@
|
|||
[package]
|
||||
name = "complexpr"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[dependencies]
|
||||
lazy_static = "1.4.0"
|
||||
num-complex = "0.4.1"
|
||||
num-rational = "0.4.0"
|
||||
num-traits = "0.2.15"
|
||||
rustyline = "10.0.0"
|
||||
28
idea.cxpr
Normal file
28
idea.cxpr
Normal file
|
|
@ -0,0 +1,28 @@
|
|||
let square = x -> x^2;
|
||||
let also_square(x) = x^2
|
||||
|
||||
let primes = range(100) |: filter(is_prime);
|
||||
let prime_squares = range(100) |: map(square);
|
||||
let also_prime_squares = range(100) |? is_prime |> square;
|
||||
|
||||
#
|
||||
let primes_and_prime_squares = primes |& prime_squares;
|
||||
|
||||
if 49 <~ data {
|
||||
println("49 is the square of a prime");
|
||||
} else {
|
||||
println("49 is not the square of a prime");
|
||||
}
|
||||
|
||||
# LET IDENT(square) EQ IDENT(x) ARROW IDENT(x) CARET INT(2) SEMICOLON
|
||||
#
|
||||
# LET IDENT(data) EQ IDENT(range) LPAREN INT(100) RPAREN PIPECOLON IDENT(filter) LPAREN IDENT(is_prime) RPAREN PIPECOLON IDENT(map) LPAREN IDENT(square) RPAREN SEMICOLON
|
||||
# LET IDENT(also_data) EQ IDENT(range) LPAREN INT(100) RPAREN PIPEQUESTION IDENT(is_prime) PIPEPOINT IDENT(square) SEMICOLON
|
||||
|
||||
# D = x:(fold(map(factors(x), n:(to_int(fold(factors(x),mul)/n))), add))
|
||||
|
||||
let D = x -> {
|
||||
let facts = factors(x);
|
||||
let product = facts |: foldl(1, mul);
|
||||
return facts |> (n -> product / n) |: foldl(0, add);
|
||||
}
|
||||
37
src/bin/main.rs
Normal file
37
src/bin/main.rs
Normal file
|
|
@ -0,0 +1,37 @@
|
|||
use std::{rc::Rc, cell::RefCell, fs::{File, self}, io::{BufReader, Read}};
|
||||
|
||||
use complexpr::{eval::Environment, interpreter::interpret, value::Value};
|
||||
use rustyline::{self, error::ReadlineError};
|
||||
|
||||
fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||
let args: Vec<String> = std::env::args().collect();
|
||||
if args.len() == 2 {
|
||||
let fname = &args[1];
|
||||
let src = fs::read_to_string(fname)?;
|
||||
interpret(&src, None)?;
|
||||
} else {
|
||||
repl()?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn repl() -> Result<(), Box<dyn std::error::Error>> {
|
||||
let mut rl = rustyline::Editor::<()>::new()?;
|
||||
let env = Rc::new(RefCell::new(Environment::new()));
|
||||
loop {
|
||||
let readline = rl.readline(">> ");
|
||||
match readline {
|
||||
Ok(line) => {
|
||||
let result = interpret(&line, Some(env.clone()));
|
||||
match result {
|
||||
Ok(Value::Nil) => (),
|
||||
Ok(value) => println!("{:?}", value),
|
||||
Err(e) => println!("Error: {}", e)
|
||||
}
|
||||
}
|
||||
Err(ReadlineError::Eof) => break,
|
||||
Err(_) => (),
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
108
src/eval.rs
Normal file
108
src/eval.rs
Normal file
|
|
@ -0,0 +1,108 @@
|
|||
use std::{collections::HashMap, rc::Rc, cell::RefCell};
|
||||
|
||||
use num_complex::Complex64;
|
||||
|
||||
use crate::{value::Value, expr::{Stmt, Expr}, token::{TokenType, Token, OpType}};
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct Environment {
|
||||
parent: Option<Rc<RefCell<Environment>>>,
|
||||
map: HashMap<Rc<str>, Value>
|
||||
}
|
||||
|
||||
impl Environment {
|
||||
pub fn new() -> Self {
|
||||
Self { parent: None, map: HashMap::new() }
|
||||
}
|
||||
|
||||
pub fn extend(parent: Rc<RefCell<Self>>) -> Self {
|
||||
Self { parent: Some(parent), map: HashMap::new() }
|
||||
}
|
||||
|
||||
pub fn get(&self, name: &str) -> Result<Value,()> {
|
||||
match self.map.get(name) {
|
||||
Some(v) => Ok(v.clone()),
|
||||
None => match self.parent {
|
||||
Some(ref p) => p.borrow().get(name),
|
||||
None => Err(())
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn declare(&mut self, name: Rc<str>, value: Value) {
|
||||
self.map.insert(name, value);
|
||||
}
|
||||
|
||||
pub fn set(&mut self, name: Rc<str>, value: Value) -> Result<(),()> {
|
||||
match self.map.contains_key(&name) {
|
||||
true => { self.map.insert(name, value); Ok(()) },
|
||||
false => match self.parent {
|
||||
Some(ref mut p) => p.borrow_mut().set(name, value),
|
||||
None => Err(())
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub fn eval_stmt(stmt: &Stmt, env: Rc<RefCell<Environment>>) -> Result<(), String> {
|
||||
match stmt {
|
||||
Stmt::Expr{ expr }
|
||||
=> drop(eval_expr(expr, env)),
|
||||
Stmt::Let { lhs: Token{ty: TokenType::Ident(s),..}, rhs: None }
|
||||
=> env.borrow_mut().declare(s.clone(), Value::Nil),
|
||||
Stmt::Let { lhs: Token{ty: TokenType::Ident(s),..}, rhs: Some(rhs) } => {
|
||||
let r = eval_expr(rhs, env.clone())?;
|
||||
env.borrow_mut().declare(s.clone(), r)
|
||||
},
|
||||
Stmt::If { conditions, bodies, else_clause }
|
||||
=> todo!(), // TODO if statements
|
||||
_ => unreachable!()
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
pub fn eval_expr(expr: &Expr, env: Rc<RefCell<Environment>>) -> Result<Value, String> {
|
||||
match expr {
|
||||
Expr::Literal { value } => match &value.ty {
|
||||
TokenType::Nil => Ok(Value::Nil),
|
||||
TokenType::True => Ok(Value::Bool(true)),
|
||||
TokenType::False => Ok(Value::Bool(false)),
|
||||
TokenType::Int(n) => Ok(Value::Int(*n)),
|
||||
TokenType::Float(f) => Ok(Value::Float(*f)),
|
||||
TokenType::ImFloat(f) => Ok(Value::Complex(Complex64::new(0.0, *f))),
|
||||
TokenType::String(s) => Ok(Value::String(s.clone())),
|
||||
_ => todo!()
|
||||
},
|
||||
Expr::Ident { value } => if let Token { ty: TokenType::Ident(name), ..} = value {
|
||||
env.borrow_mut().get(name).map_err(|_| "Variable not defined in scope".into())
|
||||
} else { unreachable!() },
|
||||
Expr::Binary { lhs, rhs, op } => match op.ty.get_op_type() {
|
||||
Some(OpType::Assignment) => {
|
||||
let r = eval_expr(rhs, env.clone())?;
|
||||
if let Expr::Ident{value: Token{ty: TokenType::Ident(name),..}} = &**lhs {
|
||||
if op.ty == TokenType::Equal {
|
||||
env.borrow_mut().set(name.clone(), r).map_err(|_| "Variable not declared before assignment")?;
|
||||
Ok(Value::Nil)
|
||||
} else {
|
||||
todo!() // TODO +=, -=, etc
|
||||
}
|
||||
} else {
|
||||
unreachable!()
|
||||
}
|
||||
},
|
||||
Some(OpType::Additive) | Some(OpType::Multiplicative) => {
|
||||
let l = eval_expr(lhs, env.clone())?;
|
||||
let r = eval_expr(rhs, env)?;
|
||||
match op.ty {
|
||||
TokenType::Plus => &l + &r,
|
||||
TokenType::Minus => &l - &r,
|
||||
TokenType::Star => &l * &r,
|
||||
TokenType::Slash => &l / &r,
|
||||
_ => todo!() // TODO other operations
|
||||
}
|
||||
},
|
||||
o => todo!("{:?}", o) // TODO other operations
|
||||
},
|
||||
e => todo!("{:?}", e) // TODO other expression types
|
||||
}
|
||||
}
|
||||
51
src/expr.rs
Normal file
51
src/expr.rs
Normal file
|
|
@ -0,0 +1,51 @@
|
|||
use std::fmt;
|
||||
|
||||
use crate::{token::{Token, OpType}};
|
||||
|
||||
pub enum Stmt {
|
||||
Expr { expr: Expr },
|
||||
Let { lhs: Token, rhs: Option<Expr> },
|
||||
If { conditions: Vec<Expr>, bodies: Vec<Vec<Stmt>>, else_clause: Option<Vec<Stmt>> }
|
||||
}
|
||||
|
||||
impl fmt::Debug for Stmt {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
match self {
|
||||
Self::Expr { expr } => write!(f, "{:?}", expr),
|
||||
Self::Let { lhs, rhs } => write!(f, "(let {:?} = {:?})", lhs, rhs),
|
||||
_ => todo!()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
pub enum Expr {
|
||||
Binary { lhs: Box<Expr>, rhs: Box<Expr>, op: Token },
|
||||
Unary { arg: Box<Expr>, op: Token },
|
||||
Ident { value: Token },
|
||||
Literal { value: Token },
|
||||
List { items: Vec<Expr> },
|
||||
FuncCall { func: Box<Expr>, args: Vec<Expr> }
|
||||
}
|
||||
|
||||
impl fmt::Debug for Expr {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
match self {
|
||||
Self::Binary { lhs: left, rhs: right, op} => write!(f, "({:?} {:?} {:?})", op, left, right),
|
||||
Self::Unary { arg, op} => write!(f, "({:?} {:?})", op, arg),
|
||||
Self::Ident { value, .. } => write!(f, "(ident {:?})", value),
|
||||
Self::Literal { value, .. } => write!(f, "(lit {:?})", value),
|
||||
Self::List { items } => write!(f, "(list {:?})", items),
|
||||
Self::FuncCall { func, args } => write!(f, "(call {:?} {:?})", func, args),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl Expr {
|
||||
pub fn is_lvalue(&self) -> bool {
|
||||
matches!(self, Expr::Ident{..})
|
||||
}
|
||||
|
||||
pub fn is_assignment(&self) -> bool {
|
||||
matches!(self, Expr::Binary{op, ..} if op.ty.get_op_type() == Some(OpType::Assignment))
|
||||
}
|
||||
}
|
||||
26
src/interpreter.rs
Normal file
26
src/interpreter.rs
Normal file
|
|
@ -0,0 +1,26 @@
|
|||
use std::{cell::RefCell, rc::Rc};
|
||||
|
||||
use crate::{value::Value, lexer::Lexer, parser::Parser, eval::{Environment, eval_stmt, eval_expr}, expr::Stmt};
|
||||
|
||||
pub fn interpret(src: &str, env: Option<Rc<RefCell<Environment>>>) -> Result<Value, Box<dyn std::error::Error>> {
|
||||
let mut lexer = Lexer::new(src, None);
|
||||
lexer.lex()?;
|
||||
let mut parser = Parser::new(lexer.into_tokens());
|
||||
let ast = parser.parse()?;
|
||||
let environ;
|
||||
if let Some(env) = env {
|
||||
environ = env;
|
||||
} else {
|
||||
environ = Rc::new(RefCell::new(Environment::new()))
|
||||
}
|
||||
let mut result = Value::Nil;
|
||||
for stmt in ast {
|
||||
if let Stmt::Expr{expr} = stmt {
|
||||
result = eval_expr(&expr, environ.clone())?;
|
||||
} else {
|
||||
eval_stmt(&stmt, environ.clone())?;
|
||||
result = Value::Nil;
|
||||
}
|
||||
}
|
||||
Ok(result)
|
||||
}
|
||||
250
src/lexer.rs
Normal file
250
src/lexer.rs
Normal file
|
|
@ -0,0 +1,250 @@
|
|||
use std::rc::Rc;
|
||||
|
||||
use crate::{ParserError, Position, token::{Token, TokenType}};
|
||||
|
||||
pub struct Lexer {
|
||||
// name of file being lexed
|
||||
filename: Option<Rc<str>>,
|
||||
line: usize,
|
||||
col: usize,
|
||||
tokens: Vec<Token>,
|
||||
start: usize,
|
||||
current: usize,
|
||||
code: Vec<char>
|
||||
}
|
||||
|
||||
impl Lexer {
|
||||
pub fn new(code: &str, filename: Option<String>) -> Self {
|
||||
Self { filename: filename.map(|s| Rc::from(s)), line: 1, col: 1, tokens: vec![], start: 0, current: 0, code: code.chars().collect() }
|
||||
}
|
||||
|
||||
pub fn into_tokens(self) -> Vec<Token> {
|
||||
self.tokens
|
||||
}
|
||||
|
||||
fn next(&mut self) -> char {
|
||||
let c = self.code[self.current];
|
||||
self.advance(c == '\n');
|
||||
c
|
||||
}
|
||||
|
||||
fn expect(&mut self, chars: &[char]) -> Option<char> {
|
||||
for c in chars {
|
||||
if self.code[self.current] == *c {
|
||||
self.advance(*c == '\n');
|
||||
return Some(*c)
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
|
||||
fn at_end(&self) -> bool {
|
||||
self.current >= self.code.len()
|
||||
}
|
||||
|
||||
fn peek(&self) -> char {
|
||||
self.code[self.current]
|
||||
}
|
||||
|
||||
fn add_token<S>(&mut self, ty: TokenType, text: S) where S: Into<String> {
|
||||
self.tokens.push(Token {
|
||||
ty,
|
||||
text: text.into(),
|
||||
pos: Position {
|
||||
file: self.filename.clone(),
|
||||
pos: self.start,
|
||||
line: self.line,
|
||||
col: self.col - (self.current - self.start)
|
||||
}
|
||||
});
|
||||
}
|
||||
|
||||
fn mk_error<S>(&self, msg: S) -> ParserError where S: Into<String> {
|
||||
ParserError {
|
||||
pos: Position { file: self.filename.clone(), pos: self.start, line: self.line, col: self.col},
|
||||
message: msg.into()
|
||||
}
|
||||
}
|
||||
|
||||
fn advance(&mut self, newline: bool) {
|
||||
if newline {
|
||||
self.line += 1;
|
||||
self.col = 1;
|
||||
} else {
|
||||
self.col += 1;
|
||||
}
|
||||
self.current += 1;
|
||||
}
|
||||
|
||||
pub fn lex(&mut self) -> Result<(), ParserError> {
|
||||
while !self.at_end() {
|
||||
self.start = self.current;
|
||||
match self.next() {
|
||||
'+' => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::PlusEqual, "+="),
|
||||
_ => self.add_token(TokenType::Plus, "+"),
|
||||
},
|
||||
'-' => match self.expect(&['=', '>']) {
|
||||
Some('=') => self.add_token(TokenType::MinusEqual, "-="),
|
||||
Some('>') => self.add_token(TokenType::Arrow, "->"),
|
||||
_ => self.add_token(TokenType::Minus, "-"),
|
||||
},
|
||||
'*' => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::StarEqual, "*="),
|
||||
_ => self.add_token(TokenType::Star, "*"),
|
||||
},
|
||||
'%' => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::PercentEqual, "%="),
|
||||
_ => self.add_token(TokenType::Percent, "%"),
|
||||
},
|
||||
'/' => match self.expect(&['=', '/']) {
|
||||
Some('=') => self.add_token(TokenType::SlashEqual, "/="),
|
||||
Some('/') => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::DoubleSlashEqual, "//="),
|
||||
_ => self.add_token(TokenType::DoubleSlash, "//")
|
||||
}
|
||||
_ => self.add_token(TokenType::Slash, "/"),
|
||||
},
|
||||
'^' => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::CaretEqual, "^="),
|
||||
_ => self.add_token(TokenType::Caret, "^"),
|
||||
},
|
||||
'=' => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::DoubleEqual, "=="),
|
||||
_ => self.add_token(TokenType::Equal, "=")
|
||||
},
|
||||
'!' => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::BangEqual, "!="),
|
||||
_ => self.add_token(TokenType::Bang, "!")
|
||||
},
|
||||
'>' => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::GreaterEqual, ">="),
|
||||
_ => self.add_token(TokenType::Greater, ">")
|
||||
},
|
||||
'<' => match self.expect(&['=']) {
|
||||
Some('=') => self.add_token(TokenType::LessEqual, "<="),
|
||||
_ => self.add_token(TokenType::Less, "<")
|
||||
},
|
||||
'&' => match self.expect(&['&']) {
|
||||
Some('&') => self.add_token(TokenType::DoubleAmper, "&&"),
|
||||
_ => self.add_token(TokenType::Amper, "&"),
|
||||
},
|
||||
'|' => match self.expect(&['|', ':', '?', '>', '&']) {
|
||||
Some('|') => self.add_token(TokenType::DoublePipe, "||"),
|
||||
Some(':') => self.add_token(TokenType::PipeColon, "|:"),
|
||||
Some('?') => self.add_token(TokenType::PipeQuestion, "|?"),
|
||||
Some('>') => self.add_token(TokenType::PipePoint, "|>"),
|
||||
Some('&') => self.add_token(TokenType::PipeAmper, "|&"),
|
||||
_ => self.add_token(TokenType::Pipe, "|"),
|
||||
},
|
||||
',' => self.add_token(TokenType::Comma, ","),
|
||||
';' => self.add_token(TokenType::Semicolon, ";"),
|
||||
'(' => self.add_token(TokenType::LParen, "("),
|
||||
')' => self.add_token(TokenType::RParen, ")"),
|
||||
'[' => self.add_token(TokenType::LBrack, "["),
|
||||
']' => self.add_token(TokenType::RBrack, "]"),
|
||||
'{' => self.add_token(TokenType::LBrace, "{"),
|
||||
'}' => self.add_token(TokenType::RBrace, "}"),
|
||||
'#' => {
|
||||
while !self.at_end() && self.peek() != '\n' {
|
||||
self.advance(false);
|
||||
}
|
||||
self.advance(true);
|
||||
},
|
||||
'"' => self.string()?,
|
||||
' ' | '\t' | '\r' | '\n' => (),
|
||||
'0'..='9' => self.number()?,
|
||||
'a'..='z' | 'A'..='Z' | '_' => self.ident()?,
|
||||
c => return Err(self.mk_error(format!("Unexpected character: {}", c)))
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn string(&mut self) -> Result<(), ParserError> {
|
||||
let mut s = String::new();
|
||||
while !self.at_end() && self.peek() != '"' {
|
||||
if self.peek() == '\\' {
|
||||
self.advance(false);
|
||||
// TODO more escape codes! \xHH, \u{HH..} or maybe \uhhhh \Uhhhhhhhh
|
||||
match self.peek() {
|
||||
'0' => s.push('\0'),
|
||||
'n' => s.push('\n'),
|
||||
't' => s.push('\t'),
|
||||
'r' => s.push('\r'),
|
||||
'e' => s.push('\x1b'),
|
||||
'\\' => s.push('\\'),
|
||||
'"' => s.push('"'),
|
||||
'\n' => (),
|
||||
c => return Err(self.mk_error(format!("Unknown escape code \\{}", c)))
|
||||
}
|
||||
self.advance(self.peek() == '\n')
|
||||
} else {
|
||||
s.push(self.peek());
|
||||
self.advance(self.peek() == '\n');
|
||||
}
|
||||
}
|
||||
if self.at_end() {
|
||||
return Err(self.mk_error("Unexpected EOF while parsing string"))
|
||||
}
|
||||
self.advance(false);
|
||||
self.add_token(TokenType::String(Rc::from(s)), self.code[self.start..self.current].iter().collect::<String>());
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn number(&mut self) -> Result<(), ParserError> {
|
||||
let mut has_dot = false;
|
||||
while !self.at_end() && (self.peek().is_numeric() || self.peek() == '.') {
|
||||
if self.peek() == '.' {
|
||||
if has_dot {
|
||||
return Err(self.mk_error("Numeric literals cannot contain two decimal points"))
|
||||
} else {
|
||||
has_dot = true;
|
||||
}
|
||||
}
|
||||
self.advance(false);
|
||||
}
|
||||
let is_imag = !self.at_end() && self.peek() == 'i';
|
||||
if is_imag { self.advance(false); }
|
||||
let literal = self.code[self.start..self.current].iter().collect::<String>();
|
||||
if is_imag {
|
||||
match literal[..literal.len()-1].parse::<f64>() {
|
||||
Ok(num) => self.add_token(TokenType::ImFloat(num), literal),
|
||||
Err(e) => return Err(self.mk_error(format!("Error parsing float: {}", e)))
|
||||
}
|
||||
} else if has_dot {
|
||||
match literal.parse::<f64>() {
|
||||
Ok(num) => self.add_token(TokenType::Float(num), literal),
|
||||
Err(e) => return Err(self.mk_error(format!("Error parsing float: {}", e)))
|
||||
}
|
||||
} else {
|
||||
match literal.parse::<i64>() {
|
||||
Ok(num) => self.add_token(TokenType::Int(num), literal),
|
||||
Err(e) => return Err(self.mk_error(format!("Error parsing float: {}", e)))
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
||||
fn ident(&mut self) -> Result<(), ParserError> {
|
||||
while !self.at_end() && (self.peek().is_ascii_alphanumeric() || self.peek() == '_') {
|
||||
self.advance(false);
|
||||
}
|
||||
let literal = self.code[self.start..self.current].iter().collect::<String>();
|
||||
let token_ty = match literal.as_ref() {
|
||||
"true" => TokenType::True,
|
||||
"false" => TokenType::False,
|
||||
"nil" => TokenType::Nil,
|
||||
"if" => TokenType::If,
|
||||
"elif" => TokenType::Elif,
|
||||
"else" => TokenType::Else,
|
||||
"while" => TokenType::While,
|
||||
"for" => TokenType::For,
|
||||
"let" => TokenType::Let,
|
||||
"return" => TokenType::Return,
|
||||
s => TokenType::Ident(Rc::from(s))
|
||||
};
|
||||
self.add_token(token_ty, literal);
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
55
src/lib.rs
Normal file
55
src/lib.rs
Normal file
|
|
@ -0,0 +1,55 @@
|
|||
use std::{rc::Rc, error::Error, fmt};
|
||||
|
||||
pub mod token;
|
||||
pub mod expr;
|
||||
pub mod lexer;
|
||||
pub mod parser;
|
||||
pub mod value;
|
||||
pub mod eval;
|
||||
pub mod interpreter;
|
||||
|
||||
#[derive(Clone, Debug)]
|
||||
pub struct Position {
|
||||
pub pos: usize,
|
||||
pub line: usize,
|
||||
pub col: usize,
|
||||
pub file: Option<Rc<str>>
|
||||
}
|
||||
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct ParserError {
|
||||
pub message: String,
|
||||
pub pos: Position
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct RuntimeError {
|
||||
pub message: String,
|
||||
pub pos: Position
|
||||
}
|
||||
|
||||
impl fmt::Display for ParserError {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
write!(f, "Error: {}\n In {} at {},{}",
|
||||
self.message,
|
||||
self.pos.file.as_ref().map(|o| o.as_ref()).unwrap_or("<unknown>"),
|
||||
self.pos.line,
|
||||
self.pos.col
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for RuntimeError {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
write!(f, "Error: {}\n In {} at {},{}",
|
||||
self.message,
|
||||
self.pos.file.as_ref().map(|o| o.as_ref()).unwrap_or("<unknown>"),
|
||||
self.pos.line,
|
||||
self.pos.col
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
impl Error for ParserError {}
|
||||
impl Error for RuntimeError {}
|
||||
231
src/parser.rs
Normal file
231
src/parser.rs
Normal file
|
|
@ -0,0 +1,231 @@
|
|||
use crate::{token::{Token, TokenType, OpType}, ParserError, expr::{Stmt, Expr}};
|
||||
|
||||
pub struct Parser {
|
||||
tokens: Vec<Token>,
|
||||
idx: usize
|
||||
}
|
||||
|
||||
impl Parser {
|
||||
pub fn new(tokens: Vec<Token>) -> Self {
|
||||
Self { tokens, idx: 0 }
|
||||
}
|
||||
|
||||
fn at_end(&self) -> bool {
|
||||
self.idx >= self.tokens.len()
|
||||
}
|
||||
|
||||
fn peek(&self) -> &Token {
|
||||
&self.tokens[self.idx]
|
||||
}
|
||||
|
||||
fn next(&mut self) -> Token {
|
||||
let t = self.tokens[self.idx].clone();
|
||||
self.idx += 1;
|
||||
t
|
||||
}
|
||||
|
||||
fn mk_error<S>(&self, msg: S) -> ParserError where S: Into<String> {
|
||||
let token = if self.at_end() {
|
||||
self.tokens.last().unwrap()
|
||||
} else {
|
||||
self.peek()
|
||||
};
|
||||
ParserError { pos: token.pos.clone(), message: msg.into() }
|
||||
}
|
||||
|
||||
fn err_on_eof(&self) -> Result<(), ParserError> {
|
||||
if self.at_end() {
|
||||
Err(self.mk_error("Unexpected EOF"))
|
||||
} else {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
pub fn parse(&mut self) -> Result<Vec<Stmt>, ParserError> {
|
||||
let mut stmts = vec![];
|
||||
while !self.at_end() {
|
||||
stmts.push(self.statement()?);
|
||||
}
|
||||
Ok(stmts)
|
||||
}
|
||||
|
||||
fn statement(&mut self) -> Result<Stmt, ParserError> {
|
||||
let next = self.peek();
|
||||
|
||||
match next.ty {
|
||||
// let statement
|
||||
TokenType::Let => {
|
||||
self.next();
|
||||
let expr = self.assignment()?;
|
||||
|
||||
// must be followed by an assignment expression
|
||||
if let Expr::Binary{lhs, rhs, op: Token{ty: TokenType::Equal,..}} = expr {
|
||||
if let Expr::Ident{value: tok} = *lhs {
|
||||
if self.at_end() {
|
||||
return Ok(Stmt::Let{lhs: tok, rhs: Some(*rhs)})
|
||||
}
|
||||
let next = self.next();
|
||||
return match next.ty {
|
||||
TokenType::Semicolon => Ok(Stmt::Let{lhs: tok, rhs: Some(*rhs)}),
|
||||
_ => Err(self.mk_error("Missing semicolon after 'let' statement".to_owned()))
|
||||
};
|
||||
} else {
|
||||
Err(self.mk_error("Invalid expression after 'let'".to_owned()))
|
||||
}
|
||||
} else if let Expr::Ident{value: tok} = expr {
|
||||
if self.at_end() {
|
||||
return Ok(Stmt::Let{lhs: tok, rhs: None})
|
||||
}
|
||||
let next = self.next();
|
||||
return match next.ty {
|
||||
TokenType::Semicolon => Ok(Stmt::Let{lhs: tok, rhs: None}),
|
||||
_ => Err(self.mk_error("Missing semicolon after 'let' statement".to_owned()))
|
||||
};
|
||||
} else {
|
||||
Err(self.mk_error("Invalid expression after 'let'".to_owned()))
|
||||
}
|
||||
}
|
||||
|
||||
// if statement
|
||||
TokenType::If => {
|
||||
self.next();
|
||||
return self.ifstmt()
|
||||
}
|
||||
|
||||
// fallback to an expression terminated with a semicolon
|
||||
_ => {
|
||||
let expr = self.assignment()?;
|
||||
if self.at_end() {
|
||||
return Ok(Stmt::Expr{expr})
|
||||
}
|
||||
|
||||
let next = self.next();
|
||||
|
||||
return match next.ty {
|
||||
TokenType::Semicolon => Ok(Stmt::Expr{expr}),
|
||||
_ => Err(self.mk_error("Missing semicolon after statement"))
|
||||
};
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Generic method for left-associative operators
|
||||
fn expr(&mut self, op_type: OpType, next_level: fn(&mut Parser) -> Result<Expr, ParserError>) -> Result<Expr, ParserError> {
|
||||
let mut expr = next_level(self)?;
|
||||
while !self.at_end() && self.peek().ty.get_op_type() == Some(op_type) {
|
||||
let op = self.next();
|
||||
let right = next_level(self)?;
|
||||
expr = Expr::Binary { lhs: Box::new(expr), rhs: Box::new(right), op };
|
||||
}
|
||||
Ok(expr)
|
||||
}
|
||||
|
||||
fn commalist(&mut self, terminator: TokenType, parse_item: fn(&mut Parser) -> Result<Expr, ParserError>) -> Result<Vec<Expr>, ParserError> {
|
||||
let mut items = vec![];
|
||||
while self.peek().ty != terminator {
|
||||
let expr = parse_item(self)?;
|
||||
items.push(expr);
|
||||
if self.peek().ty == TokenType::Comma {
|
||||
self.next();
|
||||
} else if self.peek().ty == terminator {
|
||||
break;
|
||||
} else {
|
||||
return Err(self.mk_error(format!("Expected Comma or {:?} after list", terminator)))
|
||||
}
|
||||
}
|
||||
self.next();
|
||||
Ok(items)
|
||||
}
|
||||
|
||||
fn assignment(&mut self) -> Result<Expr, ParserError> {
|
||||
let mut stack= vec![];
|
||||
let mut expr = self.pipeline()?;
|
||||
while !self.at_end() && self.peek().ty.get_op_type() == Some(OpType::Assignment) {
|
||||
let op = self.next();
|
||||
stack.push((expr, op));
|
||||
expr = self.pipeline()?;
|
||||
}
|
||||
while let Some(item) = stack.pop() {
|
||||
if !item.0.is_lvalue() {
|
||||
return Err(self.mk_error("Invalid LValue for assignment operation"))
|
||||
}
|
||||
expr = Expr::Binary{ lhs: Box::new(item.0), rhs: Box::new(expr), op: item.1 };
|
||||
}
|
||||
Ok(expr)
|
||||
}
|
||||
|
||||
fn pipeline(&mut self) -> Result<Expr, ParserError> {
|
||||
self.expr(OpType::Pipeline, Self::additive)
|
||||
}
|
||||
|
||||
fn additive(&mut self) -> Result<Expr, ParserError> {
|
||||
self.expr(OpType::Additive, Self::multiplicative)
|
||||
}
|
||||
|
||||
fn multiplicative(&mut self) -> Result<Expr, ParserError> {
|
||||
self.expr(OpType::Multiplicative, Self::exponential)
|
||||
}
|
||||
|
||||
// Right associative, so cannot use self.expr(..)
|
||||
fn exponential(&mut self) -> Result<Expr, ParserError> {
|
||||
let mut stack= vec![];
|
||||
let mut expr = self.unary()?;
|
||||
while !self.at_end() && self.peek().ty == TokenType::Caret {
|
||||
let op = self.next();
|
||||
stack.push((expr, op));
|
||||
expr = self.unary()?;
|
||||
}
|
||||
while let Some(item) = stack.pop() {
|
||||
expr = Expr::Binary{ lhs: Box::new(item.0), rhs: Box::new(expr), op: item.1 };
|
||||
}
|
||||
Ok(expr)
|
||||
}
|
||||
|
||||
fn unary(&mut self) -> Result<Expr, ParserError> {
|
||||
self.err_on_eof()?;
|
||||
if matches!(self.peek().ty, TokenType::Bang | TokenType::Minus) {
|
||||
let op = self.next();
|
||||
Ok(Expr::Unary { arg: Box::new(self.fncall()?), op })
|
||||
} else {
|
||||
self.fncall()
|
||||
}
|
||||
}
|
||||
|
||||
fn fncall(&mut self) -> Result<Expr, ParserError> {
|
||||
let expr = self.expr_base()?;
|
||||
if !self.at_end() && self.peek().ty == TokenType::LParen {
|
||||
self.next();
|
||||
let args = self.commalist(TokenType::RParen, Self::assignment)?;
|
||||
Ok(Expr::FuncCall { func: Box::new(expr), args })
|
||||
} else {
|
||||
Ok(expr)
|
||||
}
|
||||
}
|
||||
|
||||
fn expr_base(&mut self) -> Result<Expr, ParserError> {
|
||||
self.err_on_eof()?;
|
||||
let next = self.next();
|
||||
if matches!(next.ty,
|
||||
TokenType::True | TokenType::False | TokenType::Nil
|
||||
| TokenType::Int(_) | TokenType::Float(_) | TokenType::ImFloat(_)
|
||||
| TokenType::String(_)
|
||||
) {
|
||||
Ok(Expr::Literal { value: next })
|
||||
} else if let TokenType::Ident(..) = next.ty {
|
||||
Ok(Expr::Ident { value: next })
|
||||
} else if next.ty == TokenType::LParen {
|
||||
let expr = self.assignment()?;
|
||||
if self.at_end() || TokenType::RParen != self.next().ty {
|
||||
Err(self.mk_error("Left parenthesis never closed"))
|
||||
} else {
|
||||
Ok(expr)
|
||||
}
|
||||
} else {
|
||||
Err(self.mk_error(format!("Unexpected token: {:?}", next.ty)))
|
||||
}
|
||||
}
|
||||
|
||||
fn ifstmt(&mut self) -> Result<Stmt, ParserError> {
|
||||
todo!()
|
||||
}
|
||||
}
|
||||
70
src/token.rs
Normal file
70
src/token.rs
Normal file
|
|
@ -0,0 +1,70 @@
|
|||
use std::{fmt, rc::Rc};
|
||||
|
||||
use crate::Position;
|
||||
|
||||
|
||||
#[derive(Clone)]
|
||||
pub struct Token {
|
||||
pub ty: TokenType,
|
||||
pub text: String,
|
||||
pub pos: Position
|
||||
}
|
||||
|
||||
impl fmt::Debug for Token {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
write!(f, "{:?} @ {},{}", self.ty, self.pos.line, self.pos.col)
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Debug, PartialEq)]
|
||||
pub enum TokenType {
|
||||
Int(i64), Float(f64), ImFloat(f64), String(Rc<str>),
|
||||
Ident(Rc<str>),
|
||||
|
||||
Plus, Minus, Star, Slash, Percent, DoubleSlash, Caret,
|
||||
Bang, Amper, Pipe, DoubleAmper, DoublePipe,
|
||||
|
||||
Equal, PlusEqual, MinusEqual, StarEqual, SlashEqual, PercentEqual, DoubleSlashEqual, CaretEqual,
|
||||
DoubleEqual, BangEqual, Greater, GreaterEqual, Less, LessEqual,
|
||||
|
||||
Arrow, PipeColon, PipePoint, PipeQuestion, PipeAmper,
|
||||
|
||||
Comma, Semicolon,
|
||||
|
||||
LParen, RParen, LBrack, RBrack, LBrace, RBrace,
|
||||
|
||||
True, False, Nil, If, Elif, Else, For, While, Let, Return
|
||||
}
|
||||
|
||||
impl TokenType {
|
||||
pub fn get_op_type(&self) -> Option<OpType> {
|
||||
match self {
|
||||
Self::Plus | Self::Minus => Some(OpType::Additive),
|
||||
|
||||
Self::Star | Self::Slash | Self::DoubleSlash
|
||||
| Self::Percent => Some(OpType::Multiplicative),
|
||||
|
||||
Self::Caret => Some(OpType::Exponential),
|
||||
|
||||
Self::PipeColon | Self::PipeAmper | Self::PipePoint
|
||||
| Self::PipeQuestion => Some(OpType::Pipeline),
|
||||
|
||||
Self::Equal | Self::PlusEqual | Self::MinusEqual
|
||||
| Self::StarEqual | Self::SlashEqual | Self::DoubleSlashEqual
|
||||
| Self::CaretEqual | Self::PercentEqual => Some(OpType::Assignment),
|
||||
|
||||
_ => None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone,Copy,Debug,PartialEq)]
|
||||
pub enum OpType {
|
||||
Assignment, Pipeline, Additive, Multiplicative, Exponential
|
||||
}
|
||||
|
||||
impl OpType {
|
||||
pub fn is_right_associative(&self) -> bool {
|
||||
matches!(self, OpType::Exponential | OpType::Assignment)
|
||||
}
|
||||
}
|
||||
80
src/value.rs
Normal file
80
src/value.rs
Normal file
|
|
@ -0,0 +1,80 @@
|
|||
use std::{rc::Rc, collections::HashMap, ops::*};
|
||||
|
||||
type Rational = num_rational::Ratio<i64>;
|
||||
type Complex = num_complex::Complex64;
|
||||
|
||||
macro_rules! value_from {
|
||||
($variant:ident, $($kind:ty)*) => {
|
||||
$(
|
||||
impl From<$kind> for Value {
|
||||
fn from(x: $kind) -> Self {
|
||||
Self::$variant(x.into())
|
||||
}
|
||||
}
|
||||
)*
|
||||
};
|
||||
}
|
||||
|
||||
macro_rules! impl_numeric_op {
|
||||
($optrait:ty, $fnname:ident, { $($bonus:tt)* }) => {
|
||||
impl $optrait for &Value {
|
||||
type Output = Result<Value, String>;
|
||||
fn $fnname(self, other: Self) -> Self::Output {
|
||||
use Value::*;
|
||||
use num_traits::ToPrimitive;
|
||||
const RATIO_CAST_FAIL: &'static str = "Failed to cast Rational to Float";
|
||||
match (self, other) {
|
||||
(Int(a), Int(b)) => Ok(a.$fnname(b).into()),
|
||||
(Rational(a), Int(b)) => Ok(a.$fnname(b).into()),
|
||||
(Int(a), Rational(b)) => Ok(self::Rational::from(*a).$fnname(b).into()),
|
||||
(Float(a), Int(b)) => Ok(a.$fnname(*b as f64).into()),
|
||||
(Int(a), Float(b)) => Ok((*a as f64).$fnname(b).into()),
|
||||
(Float(a), Rational(b)) => Ok(a.$fnname(b.to_f64().ok_or(RATIO_CAST_FAIL)?).into()),
|
||||
(Rational(a), Float(b)) => Ok(a.to_f64().ok_or(RATIO_CAST_FAIL)?.$fnname(b).into()),
|
||||
(Float(a), Float(b)) => Ok(a.$fnname(b).into()),
|
||||
(Int(a), Complex(b)) => Ok(self::Complex::from(*a as f64).$fnname(b).into()),
|
||||
(Complex(a), Int(b)) => Ok(a.$fnname(self::Complex::from(*b as f64)).into()),
|
||||
(Float(a), Complex(b)) => Ok(self::Complex::from(a).$fnname(b).into()),
|
||||
(Complex(a), Float(b)) => Ok(a.$fnname(self::Complex::from(b)).into()),
|
||||
(Rational(a), Complex(b)) => Ok(self::Complex::from(a.to_f64().ok_or(RATIO_CAST_FAIL)?).$fnname(b).into()),
|
||||
(Complex(a), Rational(b)) => Ok(a.$fnname(self::Complex::from(b.to_f64().ok_or(RATIO_CAST_FAIL)?)).into()),
|
||||
(Complex(a), Complex(b)) => Ok(a.$fnname(b).into()),
|
||||
$($bonus)*
|
||||
(lhs, rhs) => Err(format!("Unsupported operation '{}' between {:?} and {:?}", stringify!($fnname), lhs, rhs))
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Clone, Debug)]
|
||||
pub enum Value {
|
||||
Nil,
|
||||
Int(i64), Float(f64), Complex(Complex), Rational(Rational),
|
||||
Bool(bool),
|
||||
String(Rc<str>),
|
||||
List(Rc<Vec<Value>>), Map(Rc<HashMap<Value,Value>>),
|
||||
}
|
||||
|
||||
|
||||
value_from!(Int, u8 u16 u32 i8 i16 i32 i64);
|
||||
value_from!(Float, f32 f64);
|
||||
value_from!(Complex, Complex);
|
||||
value_from!(Rational, Rational);
|
||||
value_from!(Bool, bool);
|
||||
value_from!(String, String Rc<str>);
|
||||
value_from!(List, Vec<Value>);
|
||||
value_from!(Map, HashMap<Value,Value>);
|
||||
|
||||
impl_numeric_op!(Add, add, {
|
||||
(String(a), String(b)) => Ok(((**a).to_owned() + b).into()),
|
||||
(List(a), List(b)) => {
|
||||
let mut a = (**a).clone();
|
||||
a.append(&mut (**b).clone());
|
||||
Ok(a.into())
|
||||
},
|
||||
});
|
||||
impl_numeric_op!(Sub, sub, {});
|
||||
impl_numeric_op!(Mul, mul, {});
|
||||
impl_numeric_op!(Div, div, {});
|
||||
impl_numeric_op!(Rem, rem, {});
|
||||
3
tests/code.cxpr
Normal file
3
tests/code.cxpr
Normal file
|
|
@ -0,0 +1,3 @@
|
|||
let a = 1;
|
||||
let b = 2;
|
||||
a = a + b;
|
||||
19
tests/test.rs
Normal file
19
tests/test.rs
Normal file
|
|
@ -0,0 +1,19 @@
|
|||
#![cfg(test)]
|
||||
|
||||
use std::{cell::RefCell, rc::Rc};
|
||||
|
||||
use complexpr::{lexer::Lexer, parser::Parser, eval::{Environment, eval_stmt}};
|
||||
|
||||
#[test]
|
||||
pub fn test() {
|
||||
let mut lexer = Lexer::new("let a = 1 + 1; let b = a + 1;", None);
|
||||
lexer.lex().unwrap();
|
||||
let mut parser = Parser::new(lexer.into_tokens());
|
||||
let ast = parser.parse().unwrap();
|
||||
let env = Rc::new(RefCell::new(Environment::new()));
|
||||
for stmt in ast {
|
||||
eval_stmt(&stmt, env.clone()).unwrap();
|
||||
}
|
||||
println!("{:?}", env);
|
||||
todo!("end of tests")
|
||||
}
|
||||
Loading…
Reference in a new issue