83 lines
1.9 KiB
Rust
83 lines
1.9 KiB
Rust
use std::io;
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use std::io::Write;
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use std::io::BufRead;
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use std::process;
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use tokenizer::tokenize;
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use parser::{parse, ParseResult};
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use evaluate::{evaluate, Environment};
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mod tokenizer;
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mod parser;
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mod evaluate;
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fn main() {
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println!("Unnamed language 0.01");
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repl();
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}
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fn repl() {
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let stdin = io::stdin();
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let mut stdout = io::stdout();
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let mut buf = String::with_capacity(20);
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let mut env = Environment::new();
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loop {
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buf.clear();
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print!(">> ");
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stdout.flush().ok();
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let line = stdin.lock().read_line(&mut buf);
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match line {
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Ok(_) => {
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if buf.is_empty() {
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break;
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}
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if handle_interpreter_directive(&buf) {
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continue;
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}
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let tokens = tokenize(&buf);
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println!("Tokens: {:?}", tokens);
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match parse(tokens) {
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ParseResult::Ok(ast) => {
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println!("AST: {:?}", ast);
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let (eval, new_env) = evaluate(ast, env);
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println!("{}", eval);
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env = new_env;
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},
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ParseResult::Err(err) => println!("Error: {}", err)
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}
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},
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Err(err) => {
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println!("Error: {}", err);
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}
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}
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}
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}
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fn handle_interpreter_directive(input: &str) -> bool {
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match input.chars().nth(0) {
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Some('.') => (),
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_ => return false
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}
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let commands: Vec<&str> = input.split(|c: char| c.is_whitespace()).collect();
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match commands.get(0) {
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Some(s) if *s == ".quit" => {
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println!("Siturei simasu");
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process::exit(0);
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},
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Some(s) => {
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println!("Unknown directive: {}", s);
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},
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None => () //should never happen
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}
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return true;
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}
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