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Blank line preservation

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难度
5/5
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一周以上
新手友好度
25/100
Issue 类型
功能
描述清晰度
需要澄清
活跃度
停滞
领域
tooling

调研方向

未指定任何文件、测试或入口点;首先定位节点字符串化和代码移动 API。定义并测试 spaceBefore 和 spaceAfter 如何表示空行、注释、行首换行符和缩进,并确定 toString(true) 是否包含它们。

由索引模型根据 Issue 内容生成。

描述

enhancement

When moving a block of code, you can use toString on each node and "paste" the result by using the appropriate method. There needs to be a way to preserve blank lines between nodes, so we can preserve the author's style.

The first idea that comes to mind is a method that returns a string containing only newlines (and maybe indentation?) corresponding to the number of blank lines before or after the node (so two variants). This string can then be "pasted" just like the toString result.

As an example:

foo()

// comment 1
bar()

// comment 2
foo()

Assume the bar() expression is represented by node:

node.spaceBefore() // => "\n\n// comment 1\n"
node.toString()    // => "bar()"
node.spaceAfter()  // => "\n\n\n// comment 2\n"

In the above example, the \n that begins bar()'s line is included in the spaceBefore result. And the \n that begins the line after that is included in the spaceAfter result. I'm not certain, but I think that's the expected behavior.

I'm also undecided if indentation should be included or not. I'm leaning towards no, because toString currently strips indentation and we should match that behavior.

Another thing: maybe toString(true) can include the result of spaceAfter (and even the result of spaceBefore if we're the first sibling of a BlockStatement) to make things easier?

These decisions could easily be a source of many bugs if we aren't careful.

主要语言
TypeScript
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