hakorune/plugins/nyash-toml-plugin/src/lib.rs

//! Nyash TOMLBox Plugin - minimal parse + query + toJson

use once_cell::sync::Lazy;
use std::collections::HashMap;
use std::sync::{Mutex, atomic::{AtomicU32, Ordering}};

const OK: i32 = 0;
const E_SHORT: i32 = -1;
const E_TYPE: i32 = -2;
const E_METHOD: i32 = -3;
const E_ARGS: i32 = -4;
const E_PLUGIN: i32 = -5;
const E_HANDLE: i32 = -8;

const M_BIRTH: u32 = 0;       // constructor -> instance
const M_PARSE: u32 = 1;       // parse(text) -> bool
const M_GET: u32 = 2;         // get(path.dot.segments) -> string (toml-display) or empty
const M_TO_JSON: u32 = 3;     // toJson() -> string (JSON)
const M_FINI: u32 = u32::MAX; // fini()

const TYPE_ID_TOML: u32 = 54;

struct TomlInstance { value: Option<toml::Value> }

static INST: Lazy<Mutex<HashMap<u32, TomlInstance>>> = Lazy::new(|| Mutex::new(HashMap::new()));
static NEXT_ID: AtomicU32 = AtomicU32::new(1);

#[no_mangle]
pub extern "C" fn nyash_plugin_abi() -> u32 { 1 }

#[no_mangle]
pub extern "C" fn nyash_plugin_init() -> i32 { OK }

#[no_mangle]
pub extern "C" fn nyash_plugin_invoke(
    type_id: u32,
    method_id: u32,
    instance_id: u32,
    args: *const u8,
    args_len: usize,
    result: *mut u8,
    result_len: *mut usize,
) -> i32 {
    if type_id != TYPE_ID_TOML { return E_TYPE; }
    unsafe {
        match method_id {
            M_BIRTH => {
                if result_len.is_null() { return E_ARGS; }
                if preflight(result, result_len, 4) { return E_SHORT; }
                let id = NEXT_ID.fetch_add(1, Ordering::Relaxed);
                if let Ok(mut m) = INST.lock() { m.insert(id, TomlInstance { value: None }); } else { return E_PLUGIN; }
                let b = id.to_le_bytes(); std::ptr::copy_nonoverlapping(b.as_ptr(), result, 4); *result_len = 4; OK
            }
            M_FINI => { if let Ok(mut m) = INST.lock() { m.remove(&instance_id); OK } else { E_PLUGIN } }
            M_PARSE => {
                let text = match read_arg_string(args, args_len, 0) { Some(s) => s, None => return E_ARGS };
                if let Ok(mut m) = INST.lock() { if let Some(inst) = m.get_mut(&instance_id) { inst.value = toml::from_str::<toml::Value>(&text).ok(); return write_tlv_bool(inst.value.is_some(), result, result_len); } else { return E_HANDLE; } } else { return E_PLUGIN; }
            }
            M_GET => {
                let path = match read_arg_string(args, args_len, 0) { Some(s) => s, None => return E_ARGS };
                if let Ok(m) = INST.lock() {
                    if let Some(inst) = m.get(&instance_id) {
                        let mut cur = match &inst.value { Some(v) => v, None => { return write_tlv_string("", result, result_len); } };
                        if !path.is_empty() {
                            for seg in path.split('.') {
                                match cur.get(seg) { Some(v) => cur = v, None => { return write_tlv_string("", result, result_len); } }
                            }
                        }
                        let out = cur.to_string();
                        return write_tlv_string(&out, result, result_len);
                    } else { return E_HANDLE; }
                } else { return E_PLUGIN; }
            }
            M_TO_JSON => {
                if let Ok(m) = INST.lock() {
                    if let Some(inst) = m.get(&instance_id) {
                        if let Some(v) = &inst.value {
                            // Convert via serde_json::Value
                            let sv = toml_to_json(v);
                            return match serde_json::to_string(&sv) { Ok(s) => write_tlv_string(&s, result, result_len), Err(_) => write_tlv_string("{}", result, result_len) };
                        } else { return write_tlv_string("{}", result, result_len); }
                    } else { return E_HANDLE; }
                } else { return E_PLUGIN; }
            }
            _ => E_METHOD,
        }
    }
}

fn toml_to_json(v: &toml::Value) -> serde_json::Value {
    match v {
        toml::Value::String(s) => serde_json::Value::String(s.clone()),
        toml::Value::Integer(i) => serde_json::Value::from(*i),
        toml::Value::Float(f) => serde_json::Value::from(*f),
        toml::Value::Boolean(b) => serde_json::Value::from(*b),
        toml::Value::Datetime(dt) => serde_json::Value::String(dt.to_string()),
        toml::Value::Array(arr) => serde_json::Value::Array(arr.iter().map(toml_to_json).collect()),
        toml::Value::Table(map) => {
            let mut m = serde_json::Map::new();
            for (k, vv) in map.iter() { m.insert(k.clone(), toml_to_json(vv)); }
            serde_json::Value::Object(m)
        }
    }
}

fn preflight(result: *mut u8, result_len: *mut usize, needed: usize) -> bool {
    unsafe { if result_len.is_null() { return false; } if result.is_null() || *result_len < needed { *result_len = needed; return true; } }
    false
}
fn write_tlv_result(payloads: &[(u8, &[u8])], result: *mut u8, result_len: *mut usize) -> i32 {
    if result_len.is_null() { return E_ARGS; }
    let mut buf: Vec<u8> = Vec::with_capacity(4 + payloads.iter().map(|(_,p)| 4 + p.len()).sum::<usize>());
    buf.extend_from_slice(&1u16.to_le_bytes()); buf.extend_from_slice(&(payloads.len() as u16).to_le_bytes());
    for (tag, payload) in payloads { buf.push(*tag); buf.push(0); buf.extend_from_slice(&(payload.len() as u16).to_le_bytes()); buf.extend_from_slice(payload); }
    unsafe { let needed = buf.len(); if result.is_null() || *result_len < needed { *result_len = needed; return E_SHORT; } std::ptr::copy_nonoverlapping(buf.as_ptr(), result, needed); *result_len = needed; }
    OK
}
fn write_tlv_bool(v: bool, result: *mut u8, result_len: *mut usize) -> i32 { write_tlv_result(&[(1u8, &[if v {1u8} else {0u8}])], result, result_len) }
fn write_tlv_string(s: &str, result: *mut u8, result_len: *mut usize) -> i32 { write_tlv_result(&[(6u8, s.as_bytes())], result, result_len) }

fn read_arg_string(args: *const u8, args_len: usize, n: usize) -> Option<String> {
    if args.is_null() || args_len < 4 { return None; }
    let buf = unsafe { std::slice::from_raw_parts(args, args_len) };
    let mut off = 4usize; for i in 0..=n { if buf.len() < off + 4 { return None; } let tag = buf[off]; let size = u16::from_le_bytes([buf[off+2], buf[off+3]]) as usize; if buf.len() < off + 4 + size { return None; } if i == n { if tag == 6 || tag == 7 { return Some(String::from_utf8_lossy(&buf[off+4..off+4+size]).to_string()); } else { return None; } } off += 4 + size; }
    None
}