Ruby 文档中的何处定义了续行运算符(反斜杠)?

Where in the Ruby docs is the line continuation operator (backslash) defined?

我经常在 Ruby 文档中找不到 esoterica,这就是一个很好的例子。我可以在官方文档的哪个位置阅读有关使用反斜杠字符 \ 来指示行 and/or 字符串延续的信息?谢谢!

https://ruby-doc.org/docs/ruby-doc-bundle/Manual/man-1.4/syntax.html

Ruby programs are sequence of expressions. Each expression are delimited by semicolons(;) or newlines. Backslashes at the end of line does not terminate expression.

https://ruby-doc.org/docs/ruby-doc-bundle/ProgrammingRuby/book/language.html

You can also put a backslash at the end of a line to continue it onto the next.

https://ruby-doc.org/docs/ruby-doc-bundle/UsersGuide/rg/misc.html

If a line ends with a backslash (\), the linefeed following it is ignored; this allows you to have a single logical line that spans several lines.

https://ruby-doc.org/docs/ruby-doc-bundle/Tutorial/part_02/loops.html

You can make lines "wrap around" by putting a backslash - \ - at the very end of the line.

我猜 "most official" 记录的地方是 ISO Ruby Language Specification:

的第 8.4 节 Whitespace
whitespace ::
   0x09 | 0x0b | 0x0c | 0x0d | 0x20 | line-terminator-escape-sequence

line-terminator-escape-sequence ::
   \ line-terminator

其中line-terminator又在第8.3节Line terminators中定义如下:

line-terminator ::
   0x0d? 0x0a

[注:?应该是上标,表示可选性,像这样:0x0d?,但是写起来比较麻烦一个代码块。]

因此,将两者放在一起,表示反斜杠后跟 LF 或 CRLF 被视为空白。