Module: TUITD::ANSIUtils

Included in:
HtmlRenderer, Screenshot
Defined in:
lib/tui_td/ansi_utils.rb

Overview

Shared ANSI color constants and helpers. Used by Screenshot, HtmlRenderer, and other color-aware renderers.

Constant Summary collapse

ANSI_RGB = 
{
  "black" => [0x00, 0x00, 0x00],
  "red" => [0xAA, 0x00, 0x00],
  "green" => [0x00, 0xAA, 0x00],
  "yellow" => [0xAA, 0x55, 0x00],
  "blue" => [0x00, 0x00, 0xAA],
  "magenta" => [0xAA, 0x00, 0xAA],
  "cyan" => [0x00, 0xAA, 0xAA],
  "white" => [0xAA, 0xAA, 0xAA],
  "bright_black" => [0x55, 0x55, 0x55],
  "bright_red" => [0xFF, 0x55, 0x55],
  "bright_green" => [0x55, 0xFF, 0x55],
  "bright_yellow" => [0xFF, 0xFF, 0x55],
  "bright_blue" => [0x55, 0x55, 0xFF],
  "bright_magenta" => [0xFF, 0x55, 0xFF],
  "bright_cyan" => [0x55, 0xFF, 0xFF],
  "bright_white" => [0xFF, 0xFF, 0xFF],
}.freeze
CUBE = 
[0x00, 0x5F, 0x87, 0xAF, 0xD7, 0xFF].freeze
ANSI_INDEX = 
%w[
  black red green yellow blue magenta cyan white
  bright_black bright_red bright_green bright_yellow
  bright_blue bright_magenta bright_cyan bright_white
].freeze
DEFAULT_FG = 
[0xC0, 0xC0, 0xC0].freeze
DEFAULT_BG = 
[0x00, 0x00, 0x00].freeze

Instance Method Summary collapse

Instance Method Details

#_dig(hash, *keys) ⇒ Object 



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# File 'lib/tui_td/ansi_utils.rb', line 68

def _dig(hash, *keys)
  keys.each do |k|
    return nil unless hash

    hash = hash[k] || hash[k.to_s]
  end
  hash
end

#resolve_color(name, fallback) ⇒ Object 



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# File 'lib/tui_td/ansi_utils.rb', line 37

def resolve_color(name, fallback)
  case name
  when "default"
    fallback
  when /^#([0-9a-fA-F]{6})$/
    [::Regexp.last_match(1)[0..1].to_i(16), ::Regexp.last_match(1)[2..3].to_i(16),
     ::Regexp.last_match(1)[4..5].to_i(16),]
  when /\Acolor(\d+)\z/
    xterm_256(::Regexp.last_match(1).to_i)
  when /\Abright_(.+)\z/
    ANSI_RGB[name] || fallback
  else # rubocop:disable Lint/DuplicateBranch
    ANSI_RGB[name] || fallback
  end
end

#xterm_256(index) ⇒ Object

rubocop:disable Naming/VariableNumber



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# File 'lib/tui_td/ansi_utils.rb', line 53

def xterm_256(index) # rubocop:disable Naming/VariableNumber
  if index < 16
    name = ANSI_INDEX[index]
    ANSI_RGB[name] || DEFAULT_FG
  elsif index < 232
    r = CUBE[((index - 16) / 36) % 6]
    g = CUBE[((index - 16) / 6) % 6]
    b = CUBE[(index - 16) % 6]
    [r, g, b]
  else
    v = 8 + ((index - 232) * 10)
    [v, v, v]
  end
end