ruby - 正则表达式匹配 ANSI 转义码

Question

你知道在 Ruby 字符串中选择 ANSI 转义码（转义序列）的正则表达式吗？我说的是这个：

http://ascii-table.com/ansi-escape-sequences.php

我正在寻找经过良好测试和可靠的东西。

Answer 1

我有基于其他代码的代码。很久以前的事了，我忘记了出处，但可能是这个。以下是我用来将彩色 ANSI 文本转换为标记的 HTML 格式的代码：

require "strscan"
class String
    def ansi2html
        ansi = StringScanner.new(self)
        html = StringIO.new
        until ansi.eos?
            if ansi.scan(/\e\[0?m/)
                html.print(%{</span>})
            elsif ansi.scan(/\e\[0?(\d+)m/)
                html.print(%{<span class="#{AnsiColor[ansi[1]]}">})
            else
                html.print(ansi.scan(/./m))
            end
        end
        html.string
    end
end

它与定义映射规则的哈希一起使用：

class String
    AnsiColor = {
        "1" => "bold",
        "4" => "underline",
        "30" => "black",
        "31" => "red",
        "32" => "green",
        "33" => "yellow",
        "34" => "blue",
        "35" => "magenta",
        "36" => "cyan",
        "37" => "white",
        "40" => "bg-black",
        "41" => "bg-red",
        "42" => "bg-green",
        "43" => "bg-yellow",
        "44" => "bg-blue",
        "45" => "bg-magenta",
        "46" => "bg-cyan",
        "47" => "bg-white",
    }
end

我这样使用它：

"red \x1b[31mapple\x1b[0m".ansi2html
# => "red <span class=\"red\">apple</span>"

修改它以满足您的需求。