use crate::ErrorHandler;

use super::tokens::Token;

/// The scanner's state, including the source it is scanning.
pub struct Scanner {
    source: String,
    tokens: Vec<Token>,
    start: usize,
    current: usize,
    line: usize,
}

impl Scanner {
    /// Initialize a scanner by specifying the source code to scan.
    pub fn new(source: String) -> Scanner {
        Scanner{
            source: source,
            tokens: Vec::new(),
            start: 0,
            current: 0,
            line: 1,
        }
    }

    /// Scan the source code, generating the list of tokens and returning it.
    /// The scanner itself is destroyed once the process is complete.
    pub fn scan_tokens(self, err_hdl: &mut ErrorHandler) -> Vec<Token> {
        self.tokens
    }
}