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internal: more reasonable grammar for blocks

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Consider these expples

        { 92 }
  async { 92 }
    'a: { 92 }
   #[a] { 92 }

Previously the tree for them were

  BLOCK_EXPR
    { ... }

  EFFECT_EXPR
    async
    BLOCK_EXPR
      { ... }

  EFFECT_EXPR
    'a:
    BLOCK_EXPR
      { ... }

  BLOCK_EXPR
    #[a]
    { ... }

As you see, it gets progressively worse :) The last two items are
especially odd. The last one even violates the balanced curleys
invariant we have (#10357) The new approach is to say that the stuff in
`{}` is stmt_list, and the block is stmt_list + optional modifiers

  BLOCK_EXPR
    STMT_LIST
      { ... }

  BLOCK_EXPR
    async
    STMT_LIST
      { ... }

  BLOCK_EXPR
    'a:
    STMT_LIST
      { ... }

  BLOCK_EXPR
    #[a]
    STMT_LIST
      { ... }
This commit is contained in:
Aleksey Kladov 2021-09-26 12:12:57 +03:00
parent c51a3c78cf
commit 2bf81922f7
233 changed files with 11762 additions and 11343 deletions
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4
crates/syntax/src/ted.rs
View file

@ -162,8 +162,8 @@ fn ws_before(position: &Position, new: &SyntaxElement) -> Option<SyntaxToken> {
}
if prev.kind() == T!['{'] && ast::Stmt::can_cast(new.kind()) {
if let Some(block_expr) = prev.parent().and_then(ast::BlockExpr::cast) {
let mut indent = IndentLevel::from_element(&block_expr.syntax().clone().into());
if let Some(stmt_list) = prev.parent().and_then(ast::StmtList::cast) {
let mut indent = IndentLevel::from_element(&stmt_list.syntax().clone().into());
indent.0 += 1;
return Some(make::tokens::whitespace(&format!("\n{}", indent)));
}