132 lines
4.4 KiB
Rust
132 lines
4.4 KiB
Rust
//! Executes the Lua code and returns the resulting command.
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#[cfg(feature = "lua")]
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mod enabled {
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use mlua::{Lua, Value};
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use crate::{
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base::{self, source_file::SourceElement, Handler},
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syntax::syntax_tree::expression::LuaCode,
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transpile::error::{LuaRuntimeError, TranspileError, TranspileResult},
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};
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impl LuaCode {
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/// Evaluates the Lua code and returns the resulting command.
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///
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/// # Errors
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/// - If Lua code evaluation is disabled.
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#[tracing::instrument(level = "debug", name = "eval_lua", skip_all, ret)]
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pub fn eval_string(
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&self,
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handler: &impl Handler<base::Error>,
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) -> TranspileResult<Option<String>> {
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tracing::debug!("Evaluating Lua code");
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let lua = Lua::new();
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let name = {
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let span = self.span();
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let file = span.source_file();
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let path = file.path_relative().unwrap_or_else(|| file.path().clone());
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let start = span.start_location();
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let end = span.end_location().unwrap_or_else(|| {
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let content_size = file.content().len();
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file.get_location(content_size - 1)
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.expect("Failed to get location")
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});
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format!(
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"{}:{}:{}-{}:{}",
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path.display(),
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start.line,
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start.column,
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end.line,
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end.column
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)
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};
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self.add_globals(&lua).unwrap();
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let lua_result = lua
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.load(self.code())
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.set_name(name)
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.eval::<Value>()
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.map_err(|err| {
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let err =
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TranspileError::from(LuaRuntimeError::from_lua_err(&err, self.span()));
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handler.receive(crate::Error::from(err.clone()));
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err
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})?;
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self.handle_lua_result(lua_result).map_err(|err| {
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handler.receive(err.clone());
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err
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})
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}
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fn add_globals(&self, lua: &Lua) -> mlua::Result<()> {
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let globals = lua.globals();
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let location = {
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let span = self.span();
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let file = span.source_file();
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file.path_relative().unwrap_or_else(|| file.path().clone())
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};
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globals.set("shu_location", location.to_string_lossy())?;
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Ok(())
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}
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fn handle_lua_result(&self, value: Value) -> TranspileResult<Option<String>> {
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match value {
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Value::Nil => Ok(None),
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Value::String(s) => Ok(Some(s.to_string_lossy())),
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Value::Integer(i) => Ok(Some(i.to_string())),
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Value::Number(n) => Ok(Some(n.to_string())),
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Value::Function(f) => self.handle_lua_result(f.call(()).map_err(|err| {
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TranspileError::LuaRuntimeError(LuaRuntimeError::from_lua_err(
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&err,
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self.span(),
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))
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})?),
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Value::Boolean(_)
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| Value::Error(_)
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| Value::Table(_)
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| Value::Thread(_)
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| Value::UserData(_)
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| Value::LightUserData(_)
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| Value::Other(..) => Err(TranspileError::LuaRuntimeError(LuaRuntimeError {
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code_block: self.span(),
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error_message: format!("invalid return type {}", value.type_name()),
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})),
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}
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}
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}
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}
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#[cfg(not(feature = "lua"))]
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mod disabled {
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use crate::{
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base::{self, Handler},
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syntax::syntax_tree::expression::LuaCode,
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transpile::error::{TranspileError, TranspileResult},
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};
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impl LuaCode {
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/// Will always return an error because Lua code evaluation is disabled.
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/// Enable the feature `lua` to enable Lua code evaluation.
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///
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/// # Errors
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/// - If Lua code evaluation is disabled.
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pub fn eval_string(
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&self,
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handler: &impl Handler<base::Error>,
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) -> TranspileResult<Option<String>> {
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handler.receive(TranspileError::LuaDisabled);
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tracing::error!("Lua code evaluation is disabled");
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Err(TranspileError::LuaDisabled)
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}
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}
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}
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