Class: Trainspotter::AnsiToHtml

Inherits:
Object
  • Object
show all
Defined in:
app/helpers/trainspotter/ansi_to_html.rb

Constant Summary collapse

ANSI_CODES = 
{
  "0"  => "reset",
  "1"  => "bold",
  "2"  => "dim",
  "3"  => "italic",
  "4"  => "underline",
  "30" => "black",
  "31" => "red",
  "32" => "green",
  "33" => "yellow",
  "34" => "blue",
  "35" => "magenta",
  "36" => "cyan",
  "37" => "white",
  "90" => "bright-black",
  "91" => "bright-red",
  "92" => "bright-green",
  "93" => "bright-yellow",
  "94" => "bright-blue",
  "95" => "bright-magenta",
  "96" => "bright-cyan",
  "97" => "bright-white"
}.freeze
ANSI_PATTERN = 
/\e\[([0-9;]*)m/

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.convert(text) ⇒ Object 



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# File 'app/helpers/trainspotter/ansi_to_html.rb', line 29

def self.convert(text)
  new.convert(text)
end

Instance Method Details

#convert(text) ⇒ Object 



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# File 'app/helpers/trainspotter/ansi_to_html.rb', line 33

def convert(text)
  return "" if text.nil?

  result = []
  open_spans = 0
  current_classes = []

  parts = text.split(ANSI_PATTERN, -1)

  parts.each_with_index do |part, index|
    if index.odd?
      codes = part.split(";")
      new_classes = []

      codes.each do |code|
        if code == "0" || code == ""
          open_spans.times { result << "</span>" }
          open_spans = 0
          current_classes = []
        elsif ANSI_CODES[code]
          new_classes << "ansi-#{ANSI_CODES[code]}"
        end
      end

      if new_classes.any?
        result << "<span class=\"#{new_classes.join(" ")}\">"
        open_spans += 1
        current_classes = new_classes
      end
    else
      result << ERB::Util.html_escape(part)
    end
  end

  open_spans.times { result << "</span>" }

  result.join.html_safe
end