From 30a6fcccee19877daad027a37fd3ee369a7d5d1e Mon Sep 17 00:00:00 2001 From: Vincent Ambo Date: Sun, 17 Jan 2021 20:31:03 +0300 Subject: refactor(tazjin/rlox): Move entrypoints into interpreters Right now this introduces a simple mechanism to flip between the interpreters. Change-Id: I92ee920c53d76ab6b664ac671993a6d6426af61a Reviewed-on: https://cl.tvl.fyi/c/depot/+/2412 Reviewed-by: tazjin Tested-by: BuildkiteCI --- users/tazjin/rlox/src/bytecode/mod.rs | 7 +++ users/tazjin/rlox/src/main.rs | 48 ++------------------- users/tazjin/rlox/src/treewalk/interpreter.rs | 10 +++-- .../rlox/src/treewalk/interpreter/builtins.rs | 2 +- users/tazjin/rlox/src/treewalk/mod.rs | 50 ++++++++++++++++++++++ 5 files changed, 69 insertions(+), 48 deletions(-) create mode 100644 users/tazjin/rlox/src/bytecode/mod.rs (limited to 'users/tazjin/rlox/src') diff --git a/users/tazjin/rlox/src/bytecode/mod.rs b/users/tazjin/rlox/src/bytecode/mod.rs new file mode 100644 index 000000000000..412e73106ead --- /dev/null +++ b/users/tazjin/rlox/src/bytecode/mod.rs @@ -0,0 +1,7 @@ +//! Bytecode interpreter for Lox. +//! +//! https://craftinginterpreters.com/chunks-of-bytecode.html + +pub fn main() { + unimplemented!() +} diff --git a/users/tazjin/rlox/src/main.rs b/users/tazjin/rlox/src/main.rs index 1c1dd6f42ff6..13a5748187ad 100644 --- a/users/tazjin/rlox/src/main.rs +++ b/users/tazjin/rlox/src/main.rs @@ -4,56 +4,16 @@ use std::io; use std::io::Write; use std::process; +mod bytecode; mod errors; mod parser; mod scanner; mod treewalk; fn main() { - let mut args = env::args(); - - if args.len() > 2 { - println!("Usage: rlox [script]"); - process::exit(1); - } else if let Some(file) = args.nth(1) { - run_file(&file); - } else { - run_prompt(); - } -} - -// Run Lox code from a file and print results to stdout -fn run_file(file: &str) { - let contents = fs::read_to_string(file).expect("failed to read the input file"); - let mut lox = treewalk::interpreter::Interpreter::create(); - run(&mut lox, &contents); -} - -// Evaluate Lox code interactively in a shitty REPL. -fn run_prompt() { - let mut line = String::new(); - let mut lox = treewalk::interpreter::Interpreter::create(); - - loop { - print!("> "); - io::stdout().flush().unwrap(); - io::stdin() - .read_line(&mut line) - .expect("failed to read user input"); - run(&mut lox, &line); - line.clear(); - } -} - -fn run(lox: &mut treewalk::interpreter::Interpreter, code: &str) { - let chars: Vec = code.chars().collect(); - - let result = scanner::scan(&chars) - .and_then(|tokens| parser::parse(tokens)) - .and_then(|program| lox.interpret(program).map_err(|e| vec![e])); - - if let Err(errors) = result { - report_errors(errors); + match env::var("LOX_INTERPRETER").as_ref().map(String::as_str) { + Ok("treewalk") => treewalk::main(), + _ => bytecode::main(), } } diff --git a/users/tazjin/rlox/src/treewalk/interpreter.rs b/users/tazjin/rlox/src/treewalk/interpreter.rs index 32822d72face..5b47dc0248f9 100644 --- a/users/tazjin/rlox/src/treewalk/interpreter.rs +++ b/users/tazjin/rlox/src/treewalk/interpreter.rs @@ -1,7 +1,7 @@ use crate::errors::{Error, ErrorKind}; use crate::parser::{self, Block, Expr, Literal, Statement}; -use crate::treewalk::resolver; use crate::scanner::{self, TokenKind}; +use crate::treewalk::resolver; use std::collections::HashMap; use std::rc::Rc; use std::sync::RwLock; @@ -223,9 +223,13 @@ impl Interpreter { // Interpreter itself pub fn interpret(&mut self, mut program: Block) -> Result { - let globals = self.env.read() + let globals = self + .env + .read() .expect("static globals lock poisoned") - .values.keys().map(Clone::clone) + .values + .keys() + .map(Clone::clone) .collect::>(); resolver::resolve(&globals, &mut program)?; diff --git a/users/tazjin/rlox/src/treewalk/interpreter/builtins.rs b/users/tazjin/rlox/src/treewalk/interpreter/builtins.rs index 614f30ff3b23..0ec6ae08c354 100644 --- a/users/tazjin/rlox/src/treewalk/interpreter/builtins.rs +++ b/users/tazjin/rlox/src/treewalk/interpreter/builtins.rs @@ -2,8 +2,8 @@ use std::fmt; use std::time::{SystemTime, UNIX_EPOCH}; use crate::errors::Error; -use crate::treewalk::interpreter::Value; use crate::parser::Literal; +use crate::treewalk::interpreter::Value; pub trait Builtin: fmt::Debug { fn arity(&self) -> usize; diff --git a/users/tazjin/rlox/src/treewalk/mod.rs b/users/tazjin/rlox/src/treewalk/mod.rs index d76045b91b9c..95136b2fa141 100644 --- a/users/tazjin/rlox/src/treewalk/mod.rs +++ b/users/tazjin/rlox/src/treewalk/mod.rs @@ -1,2 +1,52 @@ +use crate::*; + pub mod interpreter; mod resolver; + +pub fn main() { + let mut args = env::args(); + + if args.len() > 2 { + println!("Usage: rlox [script]"); + process::exit(1); + } else if let Some(file) = args.nth(1) { + run_file(&file); + } else { + run_prompt(); + } +} + +// Run Lox code from a file and print results to stdout +fn run_file(file: &str) { + let contents = fs::read_to_string(file).expect("failed to read the input file"); + let mut lox = treewalk::interpreter::Interpreter::create(); + run(&mut lox, &contents); +} + +// Evaluate Lox code interactively in a shitty REPL. +fn run_prompt() { + let mut line = String::new(); + let mut lox = treewalk::interpreter::Interpreter::create(); + + loop { + print!("> "); + io::stdout().flush().unwrap(); + io::stdin() + .read_line(&mut line) + .expect("failed to read user input"); + run(&mut lox, &line); + line.clear(); + } +} + +fn run(lox: &mut treewalk::interpreter::Interpreter, code: &str) { + let chars: Vec = code.chars().collect(); + + let result = scanner::scan(&chars) + .and_then(|tokens| parser::parse(tokens)) + .and_then(|program| lox.interpret(program).map_err(|e| vec![e])); + + if let Err(errors) = result { + report_errors(errors); + } +} -- cgit 1.4.1