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# frozen_string_literal: true
# This Parser translates ANSI escape codes into human readable format.
# It considers color and format changes.
# Inspired by http://en.wikipedia.org/wiki/ANSI_escape_code
module Gitlab
module Ci
module Ansi2json
class Parser
# keys represent the trailing digit in color changing command (30-37, 40-47, 90-97. 100-107)
COLOR = {
0 => 'black', # not that this is gray in the intense color table
1 => 'red',
2 => 'green',
3 => 'yellow',
4 => 'blue',
5 => 'magenta',
6 => 'cyan',
7 => 'white' # not that this is gray in the dark (aka default) color table
}.freeze
STYLE_SWITCHES = {
bold: 0x01,
italic: 0x02,
underline: 0x04,
conceal: 0x08,
cross: 0x10
}.freeze
def self.bold?(mask)
mask & STYLE_SWITCHES[:bold] != 0
end
def self.matching_formats(mask)
formats = []
STYLE_SWITCHES.each do |text_format, flag|
formats << "term-#{text_format}" if mask & flag != 0
end
formats
end
def initialize(command, ansi_stack = nil)
@command = command
@ansi_stack = ansi_stack
end
def changes
if self.respond_to?("on_#{@command}")
send("on_#{@command}", @ansi_stack) # rubocop:disable GitlabSecurity/PublicSend
end
end
# rubocop:disable Style/SingleLineMethods
def on_0(_) { reset: true } end
def on_1(_) { enable: STYLE_SWITCHES[:bold] } end
def on_3(_) { enable: STYLE_SWITCHES[:italic] } end
def on_4(_) { enable: STYLE_SWITCHES[:underline] } end
def on_8(_) { enable: STYLE_SWITCHES[:conceal] } end
def on_9(_) { enable: STYLE_SWITCHES[:cross] } end
def on_21(_) { disable: STYLE_SWITCHES[:bold] } end
def on_22(_) { disable: STYLE_SWITCHES[:bold] } end
def on_23(_) { disable: STYLE_SWITCHES[:italic] } end
def on_24(_) { disable: STYLE_SWITCHES[:underline] } end
def on_28(_) { disable: STYLE_SWITCHES[:conceal] } end
def on_29(_) { disable: STYLE_SWITCHES[:cross] } end
def on_30(_) { fg: fg_color(0) } end
def on_31(_) { fg: fg_color(1) } end
def on_32(_) { fg: fg_color(2) } end
def on_33(_) { fg: fg_color(3) } end
def on_34(_) { fg: fg_color(4) } end
def on_35(_) { fg: fg_color(5) } end
def on_36(_) { fg: fg_color(6) } end
def on_37(_) { fg: fg_color(7) } end
def on_38(stack) { fg: fg_color_256(stack) } end
def on_39(_) { fg: nil } end
def on_40(_) { bg: bg_color(0) } end
def on_41(_) { bg: bg_color(1) } end
def on_42(_) { bg: bg_color(2) } end
def on_43(_) { bg: bg_color(3) } end
def on_44(_) { bg: bg_color(4) } end
def on_45(_) { bg: bg_color(5) } end
def on_46(_) { bg: bg_color(6) } end
def on_47(_) { bg: bg_color(7) } end
def on_48(stack) { bg: bg_color_256(stack) } end
def on_49(_) { bg: nil } end
def on_90(_) { fg: fg_color(0, 'l') } end
def on_91(_) { fg: fg_color(1, 'l') } end
def on_92(_) { fg: fg_color(2, 'l') } end
def on_93(_) { fg: fg_color(3, 'l') } end
def on_94(_) { fg: fg_color(4, 'l') } end
def on_95(_) { fg: fg_color(5, 'l') } end
def on_96(_) { fg: fg_color(6, 'l') } end
def on_97(_) { fg: fg_color(7, 'l') } end
def on_99(_) { fg: fg_color(9, 'l') } end
def on_100(_) { fg: bg_color(0, 'l') } end
def on_101(_) { fg: bg_color(1, 'l') } end
def on_102(_) { fg: bg_color(2, 'l') } end
def on_103(_) { fg: bg_color(3, 'l') } end
def on_104(_) { fg: bg_color(4, 'l') } end
def on_105(_) { fg: bg_color(5, 'l') } end
def on_106(_) { fg: bg_color(6, 'l') } end
def on_107(_) { fg: bg_color(7, 'l') } end
def on_109(_) { fg: bg_color(9, 'l') } end
# rubocop:enable Style/SingleLineMethods
def fg_color(color_index, prefix = nil)
term_color_class(color_index, ['fg', prefix])
end
def fg_color_256(command_stack)
xterm_color_class(command_stack, 'fg')
end
def bg_color(color_index, prefix = nil)
term_color_class(color_index, ['bg', prefix])
end
def bg_color_256(command_stack)
xterm_color_class(command_stack, 'bg')
end
def term_color_class(color_index, prefix)
color_name = COLOR[color_index]
return if color_name.nil?
color_class(['term', prefix, color_name])
end
def xterm_color_class(command_stack, prefix)
# the 38 and 48 commands have to be followed by "5" and the color index
return unless command_stack.length >= 2
return unless command_stack[0] == "5"
command_stack.shift # ignore the "5" command
color_index = command_stack.shift.to_i
return unless color_index >= 0
return unless color_index <= 255
color_class(["xterm", prefix, color_index])
end
def color_class(segments)
[segments].flatten.compact.join('-')
end
end
end
end
end
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