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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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8
crates/ide_completion/src/patterns.rs
View file

@ -38,7 +38,7 @@ pub(crate) enum ImmediateLocation {
TupleField,
RefExpr,
IdentPat,
BlockExpr,
StmtList,
ItemList,
TypeBound,
// Fake file ast node
@ -201,7 +201,7 @@ pub(crate) fn determine_location(
ast::Use(_it) => ImmediateLocation::Use,
ast::UseTree(_it) => ImmediateLocation::UseTree,
ast::UseTreeList(_it) => ImmediateLocation::UseTree,
ast::BlockExpr(_it) => ImmediateLocation::BlockExpr,
ast::StmtList(_it) => ImmediateLocation::StmtList,
ast::SourceFile(_it) => ImmediateLocation::ItemList,
ast::ItemList(_it) => ImmediateLocation::ItemList,
ast::RefExpr(_it) => ImmediateLocation::RefExpr,
@ -421,8 +421,8 @@ mod tests {
#[test]
fn test_block_expr_loc() {
check_location(r"fn my_fn() { let a = 2; f$0 }", ImmediateLocation::BlockExpr);
check_location(r"fn my_fn() { f$0 f }", ImmediateLocation::BlockExpr);
check_location(r"fn my_fn() { let a = 2; f$0 }", ImmediateLocation::StmtList);
check_location(r"fn my_fn() { f$0 f }", ImmediateLocation::StmtList);
}
#[test]