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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
Download patch file Download diff file Expand all files Collapse all files

2
crates/parser/src/syntax_kind/generated.rs
View file

@ -187,6 +187,7 @@ pub enum SyntaxKind {
BREAK_EXPR,
LABEL,
BLOCK_EXPR,
STMT_LIST,
RETURN_EXPR,
YIELD_EXPR,
MATCH_EXPR,
@ -196,7 +197,6 @@ pub enum SyntaxKind {
RECORD_EXPR,
RECORD_EXPR_FIELD_LIST,
RECORD_EXPR_FIELD,
EFFECT_EXPR,
BOX_EXPR,
CALL_EXPR,
INDEX_EXPR,