cycles.rs

use json::parse;
use std::fs::read_to_string;

fn generate_array(arr: [u16; 256], name: &str) {
    println!("const {name} = [_]u8 {{");
    for i in 0..256 / 16 {
        print!("    ");
        for j in 0..16 {
            print!("{}, ", arr[i * 16 + j]);
        }

        println!("");
    }
    println!("}};");
}

fn main() {
    let data = read_to_string("data.json").unwrap();
    let json = parse(data.as_str()).unwrap();
    let mut max_opcode = 0;
    let mut single = [0u16; 256];
    let mut double = [0u16; 256];

    for i in json.members() {
        let mut opcode = 0;
        let mut cycles = 0;

        for (s, val) in i.entries() {
            match s {
                "opCode" => {
                    opcode = u16::from_str_radix(val.as_str().unwrap(), 16).unwrap();
                    max_opcode = max_opcode.max(opcode);
                }
                "cycles" => {
                    let val = val.as_str().unwrap();
                    cycles = u16::from_str_radix(&val[0..1], 16).unwrap();
                }
                _ => {}
            };
        }

        if opcode < 256 {
            single[opcode as usize] = cycles;
        } else {
            assert!(opcode & 0xFF00 == 0xCB00);
            double[opcode as usize & 0xFF] = cycles;
        }
    }
    generate_array(single, "single_cycles");
    generate_array(double, "double_cycles");
}