Class: Onlylogs::AnsiColorParser

Inherits:
Object
  • Object
show all
Defined in:
app/models/onlylogs/ansi_color_parser.rb

Constant Summary collapse

ANSI_COLORS = 
{
  "1" => "fw-bold",
  "30" => "log-black",
  "31" => "log-red",
  "32" => "log-green",
  "33" => "log-yellow",
  "34" => "log-blue",
  "35" => "log-magenta",
  "36" => "log-cyan",
  "37" => "log-white",
  "39" => "", # Default foreground color (reset)
  "0" => "" # Reset (no color)
}.freeze
ANSI_REGEX =

Pre-compiled regex for better performance

/\x1b\[(\d+)m/.freeze
HTML_TEMPLATES =

Pre-built HTML templates to avoid string interpolation (frozen for better performance)

{
  "1" => '<span class="fw-bold">'.freeze,
  "30" => '<span class="log-black">'.freeze,
  "31" => '<span class="log-red">'.freeze,
  "32" => '<span class="log-green">'.freeze,
  "33" => '<span class="log-yellow">'.freeze,
  "34" => '<span class="log-blue">'.freeze,
  "35" => '<span class="log-magenta">'.freeze,
  "36" => '<span class="log-cyan">'.freeze,
  "37" => '<span class="log-white">'.freeze,
  "39" => '<span class="">'.freeze,
  "0" => "".freeze # Reset (no color)
}.freeze
CLOSING_SPAN =

Pre-built closing span (frozen for better performance)

'</span>'.freeze

Class Method Summary collapse

Class Method Details

.parse(string) ⇒ Object 



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# File 'app/models/onlylogs/ansi_color_parser.rb', line 40

def self.parse(string)
  return string if string.blank?

  # Early return if no ANSI codes present
  return string unless string.include?("\x1b[")

  result = string
  stack = []

  # Replace ANSI color codes with HTML spans
  result = result.gsub(ANSI_REGEX) do |_match|
    code = ::Regexp.last_match(1)

    if code == "0"
      # Reset - close all open spans
      if stack.empty?
        ""
      else
        spans = CLOSING_SPAN * stack.length
        stack.clear
        spans
      end
    elsif (template = HTML_TEMPLATES[code])
      # Add span for this color/attribute
      stack.push(code)
      template
    else
      # Unknown code, ignore
      ""
    end
  end

  # Close any remaining open spans using string multiplication (faster than map/join)
  result += CLOSING_SPAN * stack.length if stack.any?

  result.html_safe
end