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Guard against setters mutating constants, and allow pure setters.

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This commit is contained in:
Stephen Chung
2021-05-15 11:41:42 +08:00
parent 565134c4da
commit 941e09d29d
15 changed files with 184 additions and 156 deletions
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18
src/parser.rs
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@@ -1468,24 +1468,10 @@ fn make_assignment_stmt<'a>(
Expr::Index(x, _) | Expr::Dot(x, _) => {
match check_lvalue(&x.rhs, matches!(lhs, Expr::Dot(_, _))) {
None => match &x.lhs {
// var[???] (non-indexed) = rhs, var.??? (non-indexed) = rhs
Expr::Variable(None, _, x) if x.0.is_none() => {
// var[???] = rhs, var.??? = rhs
Expr::Variable(_, _, _) => {
Ok(Stmt::Assignment(Box::new((lhs, op_info, rhs)), op_pos))
}
// var[???] (indexed) = rhs, var.??? (indexed) = rhs
Expr::Variable(i, var_pos, x) => {
let (index, _, name) = x.as_ref();
let index = i.map_or_else(|| index.unwrap().get(), |n| n.get() as usize);
match state.stack[state.stack.len() - index].1 {
AccessMode::ReadWrite => {
Ok(Stmt::Assignment(Box::new((lhs, op_info, rhs)), op_pos))
}
// Constant values cannot be assigned to
AccessMode::ReadOnly => {
Err(PERR::AssignmentToConstant(name.to_string()).into_err(*var_pos))
}
}
}
// expr[???] = rhs, expr.??? = rhs
expr => {
Err(PERR::AssignmentToInvalidLHS("".to_string()).into_err(expr.position()))