106 lines
2.6 KiB
Rust
106 lines
2.6 KiB
Rust
#![feature(advanced_slice_patterns, slice_patterns, box_patterns)]
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extern crate simplerepl;
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use std::path::Path;
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use std::fs::File;
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use std::io::Read;
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use simplerepl::{REPL, ReplState};
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use tokenizer::tokenize;
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mod tokenizer;
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use parser::{parse};
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mod parser;
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use eval::{Evaluator};
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mod eval;
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fn main() {
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let args: Vec<String> = std::env::args().collect();
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if let Some(filename) = args.get(1) {
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let mut source_file = File::open(&Path::new(filename)).unwrap();
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let mut buffer = String::new();
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source_file.read_to_string(&mut buffer).unwrap();
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let tokens = match tokenize(&buffer) {
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Some(t) => t,
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None => { println!("Tokenization error"); return; }
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};
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let ast = match parse(&tokens, &[]) {
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Ok(ast) => ast,
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Err(err) => { println!("Parse error: {:?}", err); return; }
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};
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let mut evaluator = Evaluator::new();
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let results = evaluator.run(ast);
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for result in results.iter() {
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println!("{}", result);
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}
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} else {
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println!("Schala v 0.02");
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let initial_state = InterpreterState {
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show_tokens: false,
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show_parse: false,
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evaluator: Evaluator::new(),
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};
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REPL::with_prompt_and_state(Box::new(repl_handler), ">> ", initial_state)
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.run();
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}
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}
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struct InterpreterState {
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show_tokens: bool,
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show_parse: bool,
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evaluator: Evaluator,
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}
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impl ReplState for InterpreterState {
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fn update_state(&mut self, input: &Vec<&str>) {
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match &input[..] {
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["set", "show", "tokens", "true"] => {
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self.show_tokens = true;
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},
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["set", "show", "tokens", "false"] => {
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self.show_tokens = false;
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},
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["set", "show", "parse", "true"] => {
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self.show_parse = true;
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},
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["set", "show", "parse", "false"] => {
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self.show_parse = false;
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},
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_ => ()
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}
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}
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}
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fn repl_handler(input: &str, state: &mut InterpreterState) -> String {
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let tokens = match tokenize(input) {
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None => return format!("Tokenization error"),
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Some(t) => t
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};
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if state.show_tokens {
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println!("Tokens: {:?}", tokens);
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}
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let ast = match parse(&tokens, &[]) {
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Ok(ast) => ast,
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Err(err) => return format!("Parse error: {}", err.msg),
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};
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if state.show_parse {
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println!("AST: {:?}", ast);
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}
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let mut output: Vec<String> = state.evaluator.run(ast);
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//for now only handle last output
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output.pop().unwrap_or("".to_string())
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}
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