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fixed scoping issue for nonlocals - now also indirect outer scopes are supported

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TheAnyKey 2020-06-01 22:47:28 +00:00
parent 097b6a1889
commit 50c0b99136
1 changed files with 13 additions and 5 deletions
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16
src/symboltable.rs
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@ -221,11 +221,19 @@ impl<'a> SymbolTableAnalyzer<'a> {
} else {
match symbol.scope {
SymbolScope::Nonlocal => {
// check if name is defined in parent table!
let parent_symbol_table = self.tables.last();
if let Some((symbols, _)) = parent_symbol_table {
let scope_depth = self.tables.len();
if !symbols.contains_key(&symbol.name) || scope_depth < 2 {
if scope_depth > 0 {
// check if the name is already defined in any outer scope
// therefore
if scope_depth < 2
|| !self
.tables
.iter()
.skip(1) // omit the global scope as it is not non-local
.rev() // revert the order for better performance
.any(|t| t.0.contains_key(&symbol.name))
// true when any of symbol tables contains the name -> then negate
{
return Err(SymbolTableError {
error: format!("no binding for nonlocal '{}' found", symbol.name),
location: Default::default(),