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Formatter: five cases where comments and doc comments are placed wrongly

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已經有一個關聯 PR 被合併了。

  • #9119 來自 @cknitt —— 已合併

評估

難度
4/5
預估耗時
3-5 天
新手友好度
35/100
Issue 類型
缺陷
描述清晰度
描述清楚
活躍度
停滯
技術堆疊
ocaml
領域
compilers

研究方向

Start with the formatter cases described in the issue and inspect parameters_should_hug in compiler/syntax/src/res_parsetree_viewer.ml for the first case. Reproduce each of the five examples and trace the comment handling and formatting paths involved. Done means all five format correctly and remain stable when formatted again, with case 4 preserving the AST; an open pull request is already linked.

由索引模型根據 Issue 內容生成。

描述

Found by a bug hunt over the 16 commits from eb087382 to cd641cbc.

All five are stable when formatted again. The fourth changes the AST, and the others change only the layout.

  1. A doc comment on a single hugged parameter is printed with a line break and no indent:
    let f = (/** r */ {x, y}) => x prints as let f = (/** r */ followed by {x, y}) => x at column 0. The same happens for [a], (a, b) and (). parameters_should_hug checks the parameter's attrs but not pat.ppat_attributes, where the doc comment is stored. This input is accepted since #9055.
  2. A trailing line comment after a parenthesized switch/if operand moves into the block, followed by a blank line:
    switch (x) // c1 then { | 1 => 2 | _ => 3 } prints as switch x {, then // c1, a blank line and | 1 => 2. Without the parentheses (#9061) the comment stays with the operand.
  3. A comment before a list tail spread moves after the dots:
    list{1, /* c */ ...xs} prints as list{1, .../* c */ xs}. Arrays keep it in place.
  4. Doc comments are printed before an attribute that precedes them, which changes the attribute order in the AST:
    type u = /** d1 */ @a /** d2 */ {x: int} prints /** d1 */, /** d2 */, then @a type u = {x: int}.
  5. A file that contains only a line comment gets an extra trailing newline: // c\n formats as // c\n\n.

Cases 2, 3 and 5 reproduce at b123b7c3. That revision rejects the inputs of 1 and 4.

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OCaml
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