283 lines
11 KiB
Rust
283 lines
11 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 std::sync::Arc;
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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::{
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error::{LuaRuntimeError, MismatchedTypes, TranspileError, TranspileResult},
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expression::{ComptimeValue, ExpectedType},
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Scope, VariableData,
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},
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};
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impl LuaCode {
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/// Evaluated the Lua code and returns the resulting value.
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///
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/// # Errors
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/// - If evaluation fails
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#[tracing::instrument(level = "debug", name = "eval_lua", skip_all, ret)]
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pub fn eval(
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&self,
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scope: &Arc<Scope>,
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handler: &impl Handler<base::Error>,
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) -> TranspileResult<(mlua::Value, mlua::Lua)> {
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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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if let Err(err) = self.add_globals(&lua, scope) {
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let err = 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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handler.receive(crate::Error::from(err.clone()));
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return Err(err);
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}
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let res = 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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res.map(|v| {
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tracing::debug!("Lua code evaluated successfully");
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(v, lua)
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})
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}
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/// Evaluates the Lua code and returns the resulting [`ComptimeValue`].
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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_comptime(
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&self,
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scope: &Arc<Scope>,
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handler: &impl Handler<base::Error>,
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) -> TranspileResult<Option<ComptimeValue>> {
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// required to keep the lua instance alive
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let (lua_result, _lua) = self.eval(scope, handler)?;
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self.handle_lua_result(lua_result, handler)
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}
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fn add_globals(&self, lua: &Lua, scope: &Arc<Scope>) -> 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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if let Some(inputs) = self.inputs() {
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for x in inputs.elements() {
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let name = x.span.str();
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let value = match scope.get_variable(name).as_deref() {
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Some(VariableData::MacroParameter { macro_name, .. }) => {
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Value::String(lua.create_string(format!("$({macro_name})"))?)
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}
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Some(VariableData::ScoreboardValue { objective, target }) => {
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let table = lua.create_table()?;
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table.set("objective", lua.create_string(objective)?)?;
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table.set("target", lua.create_string(target)?)?;
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Value::Table(table)
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}
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Some(VariableData::BooleanStorage { storage_name, path }) => {
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let table = lua.create_table()?;
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table.set("storage", lua.create_string(storage_name)?)?;
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table.set("path", lua.create_string(path)?)?;
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Value::Table(table)
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}
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Some(_) => todo!("allow other variable types"),
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None => todo!("throw correct error"),
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};
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globals.set(name, value)?;
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}
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}
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Ok(())
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}
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fn handle_lua_result(
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&self,
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value: Value,
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handler: &impl Handler<base::Error>,
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) -> TranspileResult<Option<ComptimeValue>> {
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match value {
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Value::Nil => Ok(None),
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Value::String(s) => Ok(Some(ComptimeValue::String(s.to_string_lossy()))),
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Value::Integer(i) => Ok(Some(ComptimeValue::Integer(i))),
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// TODO: change when floating point comptime numbers are supported
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Value::Number(n) => Ok(Some(ComptimeValue::String(n.to_string()))),
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Value::Function(f) => self.handle_lua_result(
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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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handler,
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),
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Value::Boolean(boolean) => Ok(Some(ComptimeValue::Boolean(boolean))),
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Value::Table(table) => match table.get::<Value>("value") {
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Ok(Value::Nil) => {
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let err = TranspileError::LuaRuntimeError(LuaRuntimeError {
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code_block: self.span(),
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error_message: "return table must contain non-nil 'value'".to_string(),
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});
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handler.receive(err.clone());
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Err(err)
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}
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Ok(value) => {
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let value = match self.handle_lua_result(value, handler)? {
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Some(ComptimeValue::String(s)) => {
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let contains_macro = match table.get::<Value>("contains_macro") {
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Ok(Value::Boolean(boolean)) => Ok(boolean),
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Ok(value) => {
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if let Some(ComptimeValue::Boolean(boolean)) =
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self.handle_lua_result(value, handler)?
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{
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Ok(boolean)
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} else {
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let err =
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TranspileError::MismatchedTypes(MismatchedTypes {
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expression: self.span(),
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expected_type: ExpectedType::Boolean,
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});
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handler.receive(err.clone());
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Err(err)
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}
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}
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_ => {
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let err =
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TranspileError::MismatchedTypes(MismatchedTypes {
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expression: self.span(),
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expected_type: ExpectedType::Boolean,
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});
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handler.receive(err.clone());
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Err(err)
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}
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}?;
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if contains_macro {
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Some(ComptimeValue::MacroString(
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s.parse().expect("parsing cannot fail"),
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))
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} else {
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Some(ComptimeValue::String(s))
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}
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}
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value => value,
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};
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Ok(value)
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}
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Err(err) => {
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let err = 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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handler.receive(err.clone());
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Err(err)
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}
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},
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Value::Error(_)
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| Value::Thread(_)
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| Value::UserData(_)
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| Value::LightUserData(_)
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| Value::Other(..) => {
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let 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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handler.receive(err.clone());
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Err(err)
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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 std::sync::Arc;
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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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use crate::transpile::{expression::ComptimeValue, Scope};
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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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/// - Always, as the lua feature is disabled
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#[tracing::instrument(level = "debug", name = "eval_lua", skip_all, ret)]
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pub fn eval(
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&self,
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scope: &Arc<Scope>,
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handler: &impl Handler<base::Error>,
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) -> TranspileResult<()> {
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let _ = scope;
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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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/// 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_comptime(
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&self,
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scope: &Arc<Scope>,
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handler: &impl Handler<base::Error>,
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) -> TranspileResult<Option<ComptimeValue>> {
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let _ = scope;
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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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