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仅在换行符处插入换行符,使换行符不超过80个字符

string regex ruby

-1

nzifnab · 技术社区 · 6 年前

以下是一些示例内容的外观:

"""
Mittens the cat ate a salad on Friday morning. He's a cat, so I'm not really sure why he was eating a salad, but that's what he was doing. Do cats normally like salad? It wasn't salmon-flavored or anything crazy like that.

I can think of three reasons why a cat might eat salad:
1. The cat is insane
2. The cat likes mice, and just last week we noticed that a mice was eating some salad, so maybe the cat decided to shortcut the food chain and eat a salad instead of getting the nutrients of the salad from the consumption of the mouse.
3. Cats are weird.
"""

运行完newline插入器之后,它将如下所示:

"""
Mittens the cat ate a salad on Friday morning. He's a cat, so I'm not really
sure why he was eating a salad, but that's what he was doing. Do cats normally
like salad? It wasn't salmon-flavored or anything crazy like that.

I can think of three reasons why a cat might eat salad:
1. The cat is insane
2. The cat likes mice, and just last week we noticed that a mice was eating some
salad, so maybe the cat decided to shortcut the food chain and eat a salad
instead of getting the nutrients of the salad from the consumption of the mouse.
3. Cats are weird.
"""

我发现有几个问题可以解决在N个字符处添加新行的问题。我知道我可以在空间上分开计数

我的直觉告诉我,使用regex和look aheads/look behinds有一个很好的解决方案。

content = """
this is some content with words and stuff
and here is another line things
"""
content = content.gsub(%r{(.{10}) }, "\\1\n")
puts content

哪些输出:

this is some
content with
words and stuff
and here is
another line
things

但它让线几乎消失了

2 回复 | 直到 6 年前

sawa 6 年前

puts content.gsub(/(.{1,10})(?:\s+|$)/, "\\1\n")
# >>this is
# >>some
# >>content
# >>with words
# >>and stuff
# >>and here
# >>is another
# >>line
# >>things

囊性纤维变性。 https://apidock.com/rails/ActionView/Helpers/TextHelper/word_wrap

nzifnab 6 年前

我最终选择了穿越路线:

def wordwrap(content, line_length)
  words = content.scan(/(?:\A|\s)[^\s]*/)
  remaining = line_length
  words.each do |word|
    if word.length > remaining
      word.gsub!(/^\s/, "")
      remaining = line_length - word.length
      word.insert(0, "\n")
    else
      if word =~ /^\n/
        remaining = line_length - word.length - 1
      else
        remaining -= word.length
      end
    end
  end

  words.join
end

line_length 角色。

这比我预想的要混乱一点,但它完成了任务。

Cary Swoveland 5 年前

r = /.{,80}[\n ]/

puts content.gsub(r) { |s| s[0..-2] << "\n" }

显示以下内容:

Mittens the cat ate a salad on Friday morning. He's a cat, so I'm not really
sure why he was eating a salad, but that's what he was doing. Do cats normally
like salad? It wasn't salmon-flavored or anything crazy like that.

I can think of three reasons why a cat might eat salad:
1. The cat is insane.
2. The cat likes mice, and just last week we noticed that a mice was eating some
salad, so maybe the cat decided to shortcut the food chain and eat a salad
instead of getting the nutrients of the salad from the consumption of the mouse.
3. Cats are weird.

正则表达式最多可匹配80个字符,后跟换行符或空格。无论匹配的最后一个字符是空格还是换行符,最后一个字符都将替换为块中的换行符。

要使此操作生效,字符串在一行中不能有多个空格,并且字符串必须以换行符结尾(即。, "...weird.\n" ). 如果这些条件不能保持简单的预处理步骤,则可以保证:

mod_content = content.squeeze(' ').chomp << "\n"