92 lines
2.9 KiB
Rust
92 lines
2.9 KiB
Rust
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use {
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crate::{arraylist::ArrayList, Labels},
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mlua::{Result, prelude::*},
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};
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#[derive(Clone, Copy, Debug, PartialEq, Eq, FromLua)]
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pub struct UnassignedLabel(pub usize);
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impl LuaUserData for UnassignedLabel {
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fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
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fields.add_field_method_get("id", |_, this| Ok(this.0));
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}
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fn add_methods<'lua, M: LuaUserDataMethods<'lua, Self>>(methods: &mut M) {
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methods.add_method("here", |lua, this, ()| {
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match lua
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.globals()
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.get::<_, LuaUserDataRefMut<Labels>>("_LABELS")?
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.0
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.get_mut(
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this.0
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.checked_sub(1)
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.ok_or_else(|| mlua::Error::runtime("Invalid label"))?,
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) {
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Some(entry) => {
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*entry = Some(
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lua.globals()
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.get::<_, LuaTable>("_CODE")?
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.get::<_, LuaUserDataRef<ArrayList<u8>>>("text")?
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.0
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.len(),
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);
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Ok(())
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}
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None => Err(mlua::Error::runtime("Invalid label")),
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}
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});
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}
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}
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#[derive(Clone, Copy, Debug, PartialEq, Eq, FromLua)]
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pub struct Label(pub usize);
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impl LuaUserData for Label {
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fn add_fields<'lua, F: LuaUserDataFields<'lua, Self>>(fields: &mut F) {
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fields.add_field_method_get("id", |_, this| Ok(this.0));
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}
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}
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pub fn label<'lua>(lua: &'lua Lua, val: LuaValue<'lua>) -> Result<LuaValue<'lua>> {
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let globals = lua.globals();
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let mut labels = globals.get::<_, LuaUserDataRefMut<Labels>>("_LABELS")?;
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let code_ix = globals
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.get::<_, LuaTable>("_CODE")?
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.get::<_, LuaUserDataRefMut<ArrayList<u8>>>("text")?
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.0
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.len();
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match val {
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LuaValue::Table(_) => {
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labels.0.push(None);
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Ok(LuaValue::UserData(
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lua.create_userdata(UnassignedLabel(labels.0.len()))?,
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))
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}
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LuaValue::String(str) => {
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labels.0.push(Some(code_ix + 1));
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globals
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.get::<_, LuaTable>("_SYM_TABLE")?
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.set(str, labels.0.len())?;
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Ok(LuaValue::UserData(
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lua.create_userdata(Label(labels.0.len()))?,
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))
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}
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LuaNil => {
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labels.0.push(Some(code_ix + 1));
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Ok(LuaValue::UserData(
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lua.create_userdata(Label(labels.0.len()))?,
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))
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}
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_ => Err(mlua::Error::BadArgument {
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to: Some("label".into()),
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pos: 1,
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name: None,
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cause: std::sync::Arc::new(mlua::Error::runtime(
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"Unsupported type (nil and string are only supported)",
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)),
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}),
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}
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}
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