feat: allow inlined rules to be empty

tree-sitter · Mar 31, 2024 · 964214f · 964214f
1 parent 0b44032
commit 964214f
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/cli/src/generate/prepare_grammar/flatten_grammar.rs b/cli/src/generate/prepare_grammar/flatten_grammar.rs
@@ -192,7 +192,13 @@ pub(super) fn flatten_grammar(grammar: ExtractedSyntaxGrammar) -> Result<SyntaxG
  }
  for (i, variable) in variables.iter().enumerate() {
  for production in &variable.productions {
- if production.steps.is_empty() && symbol_is_used(&variables, Symbol::non_terminal(i)) {
+ if production.steps.is_empty()
+ && symbol_is_used(&variables, Symbol::non_terminal(i))
+ && !grammar
+ .variables_to_inline
+ .iter()
+ .any(|symbol| symbol.index == i)
+ {
  return Err(anyhow!(
  "The rule `{}` matches the empty string.