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Simplify let/const statement.

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This commit is contained in:
Stephen Chung 2020-10-09 13:25:53 +08:00
parent 1f74b36496
commit 630ec51624
1 changed files with 11 additions and 24 deletions
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35
src/engine.rs
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@ -1780,36 +1780,23 @@ impl Engine {
Stmt::ReturnWithVal(_) => unreachable!(),
// Let statement
Stmt::Let(x) if x.1.is_some() => {
// Let/const statement
Stmt::Let(x) | Stmt::Const(x) => {
let ((var_name, _), expr, _) = x.as_ref();
let expr = expr.as_ref().unwrap();
let val = self
.eval_expr(scope, mods, state, lib, this_ptr, expr, level)?
.flatten();
let var_name = unsafe_cast_var_name_to_lifetime(var_name, &state);
scope.push_dynamic_value(var_name, ScopeEntryType::Normal, val, false);
Ok(Default::default())
}
let entry_type = match stmt {
Stmt::Let(_) => ScopeEntryType::Normal,
Stmt::Const(_) => ScopeEntryType::Constant,
_ => unreachable!(),
};
Stmt::Let(x) => {
let ((var_name, _), _, _) = x.as_ref();
let var_name = unsafe_cast_var_name_to_lifetime(var_name, &state);
scope.push(var_name, ());
Ok(Default::default())
}
// Const statement
Stmt::Const(x) => {
let ((var_name, _), expr, _) = x.as_ref();
let val = if let Some(expr) = expr { self
.eval_expr(scope, mods, state, lib, this_ptr, expr, level)?
.flatten()
let val = if let Some(expr) = expr {
self.eval_expr(scope, mods, state, lib, this_ptr, expr, level)?
.flatten()
} else {
().into()
};
let var_name = unsafe_cast_var_name_to_lifetime(var_name, &state);
scope.push_dynamic_value(var_name, ScopeEntryType::Constant, val, true);
scope.push_dynamic_value(var_name, entry_type, val, false);
Ok(Default::default())
}