141 lines
3.5 KiB
Rust
141 lines
3.5 KiB
Rust
#![feature(advanced_slice_patterns, slice_patterns, box_patterns)]
|
|
extern crate simplerepl;
|
|
extern crate getopts;
|
|
|
|
use std::path::Path;
|
|
use std::fs::File;
|
|
use std::io::Read;
|
|
|
|
use simplerepl::{REPL, ReplState};
|
|
|
|
use tokenizer::tokenize;
|
|
mod tokenizer;
|
|
|
|
use parser::parse;
|
|
mod parser;
|
|
|
|
use eval::Evaluator;
|
|
mod eval;
|
|
|
|
use compilation::compilation_sequence;
|
|
mod compilation;
|
|
mod llvm_wrap;
|
|
|
|
fn main() {
|
|
let option_matches =
|
|
program_options().parse(std::env::args()).expect("Could not parse options");
|
|
match option_matches.free[..] {
|
|
[] | [_] => {
|
|
run_repl();
|
|
}
|
|
[_, ref filename, _..] => {
|
|
run_noninteractive(filename, !option_matches.opt_present("i"));
|
|
}
|
|
};
|
|
}
|
|
|
|
fn program_options() -> getopts::Options {
|
|
let mut options = getopts::Options::new();
|
|
options.optflag("i",
|
|
"interpret",
|
|
"Interpret source file instead of compiling");
|
|
options
|
|
}
|
|
|
|
fn run_noninteractive(filename: &str, compile: bool) {
|
|
let mut source_file = File::open(&Path::new(filename)).unwrap();
|
|
let mut buffer = String::new();
|
|
source_file.read_to_string(&mut buffer).unwrap();
|
|
|
|
let tokens = match tokenize(&buffer) {
|
|
Ok(t) => t,
|
|
Err(e) => {
|
|
println!("Tokenization error: {}", e.msg);
|
|
std::process::exit(1)
|
|
}
|
|
};
|
|
|
|
let ast = match parse(&tokens, &[]) {
|
|
Ok(ast) => ast,
|
|
Err(err) => {
|
|
println!("Parse error: {:?}", err);
|
|
std::process::exit(1)
|
|
}
|
|
};
|
|
|
|
if compile {
|
|
compilation_sequence(ast, filename);
|
|
} else {
|
|
let mut evaluator = Evaluator::new();
|
|
let results = evaluator.run(ast);
|
|
for result in results.iter() {
|
|
println!("{}", result);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn run_repl() {
|
|
println!("Schala v 0.02");
|
|
let initial_state = InterpreterState {
|
|
show_tokens: false,
|
|
show_parse: false,
|
|
evaluator: Evaluator::new(),
|
|
};
|
|
REPL::with_prompt_and_state(Box::new(repl_handler), ">> ", initial_state).run();
|
|
}
|
|
|
|
struct InterpreterState {
|
|
show_tokens: bool,
|
|
show_parse: bool,
|
|
evaluator: Evaluator,
|
|
}
|
|
|
|
impl ReplState for InterpreterState {
|
|
fn update_state(&mut self, input: &Vec<&str>) {
|
|
match input[..] {
|
|
["set", "show", "tokens", "true"] => {
|
|
self.show_tokens = true;
|
|
}
|
|
["set", "show", "tokens", "false"] => {
|
|
self.show_tokens = false;
|
|
}
|
|
["set", "show", "parse", "true"] => {
|
|
self.show_parse = true;
|
|
}
|
|
["set", "show", "parse", "false"] => {
|
|
self.show_parse = false;
|
|
}
|
|
_ => (),
|
|
}
|
|
}
|
|
}
|
|
|
|
fn repl_handler(input: &str, state: &mut InterpreterState) -> String {
|
|
let mut result = String::new();
|
|
|
|
let tokens = match tokenize(input) {
|
|
Err(e) => return format!("Tokenization error"),
|
|
Ok(t) => t,
|
|
};
|
|
|
|
if state.show_tokens {
|
|
result.push_str(&format!("Tokens: {:?}\n", tokens));
|
|
}
|
|
|
|
let ast = match parse(&tokens, &[]) {
|
|
Ok(ast) => ast,
|
|
Err(err) => return format!("Parse error: {}", err.msg),
|
|
};
|
|
|
|
if state.show_parse {
|
|
result.push_str(&format!("AST: {:?}\n", ast));
|
|
}
|
|
|
|
let mut output: Vec<String> = state.evaluator.run(ast);
|
|
|
|
// for now only handle last output
|
|
let interpreter_result = output.pop().unwrap_or("".to_string());
|
|
result.push_str(&interpreter_result);
|
|
result
|
|
}
|