alpha-shell 0.3.0

A transpiler for the AlphaShell language
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

use super::{error::ParserResult, node::Node, parse_helper::ParseHelper};
use crate::{check_token, parse::error::Error, types::TT};

pub fn parse(ph: &mut ParseHelper) -> ParserResult<Node> {
  check_token!(ph, TT::Return);
  ph.advance();

  let value = if let Some(TT::Integer(int)) = ph.peek(0) {
    if *int < 0 && *int >= 256 {
      return Err(Error::new(
        &format!("Invalid return value: {int}"),
        ph.get(0),
      ));
    }

    Node::Return(*int as u8)
  } else {
    Node::Return(0)
  };

  ph.advance();

  check_token!(ph, TT::Semicolon);

  ph.advance();

  Ok(value)
}