Witch of Git - ivy/blob - src/main.rs

   1 use ess::{self, parser::ParseError, Sexp};
   2 use std::io::{self, Read};
   3
   4 mod ast;
   5 use ast::Ast;
   6
   7 fn parse(input: &str) -> Result<Sexp, ParseError> {
   8     let (sexp, rest) = ess::parse_one(input)?;
   9     if !rest.trim().is_empty() {
  10         return Err(ParseError::Unexpected('\0', sexp.get_loc().1));
  11     }
  12     Ok(sexp)
  13 }
  14
  15 static BUILTINS: &[&str] = &[
  16     "true", "false", "<", ">", "<=", ">=", "==", "!=", "+", "-", "*", "/", "%",
  17 ];
  18
  19 fn main() -> io::Result<()> {
  20     let stdin = std::io::stdin();
  21     let mut text = String::new();
  22     stdin.lock().read_to_string(&mut text)?;
  23     let sexp = match parse(&text) {
  24         Ok(item) => item,
  25         Err(err) => {
  26             println!("{:?}", err);
  27             std::process::exit(1);
  28         }
  29     };
  30     let (ast, builtins) = match Ast::parse(BUILTINS, &sexp) {
  31         Ok(ast) => ast,
  32         Err(err) => {
  33             println!("{}", err);
  34             std::process::exit(1);
  35         }
  36     };
  37     println!("builtins: {:?}", builtins);
  38     println!("{}", ast.to_doc().pretty(80));
  39     Ok(())
  40 }