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# ANSI color library
#
# Implementation per http://en.wikipedia.org/wiki/ANSI_escape_code
module Ansi2html
# 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
}
STYLE_SWITCHES = {
bold: 0x01,
italic: 0x02,
underline: 0x04,
conceal: 0x08,
cross: 0x10,
}
def self.convert(ansi)
Converter.new().convert(ansi)
end
class Converter
def on_0(s) reset() end
def on_1(s) enable(STYLE_SWITCHES[:bold]) end
def on_3(s) enable(STYLE_SWITCHES[:italic]) end
def on_4(s) enable(STYLE_SWITCHES[:underline]) end
def on_8(s) enable(STYLE_SWITCHES[:conceal]) end
def on_9(s) enable(STYLE_SWITCHES[:cross]) end
def on_21(s) disable(STYLE_SWITCHES[:bold]) end
def on_22(s) disable(STYLE_SWITCHES[:bold]) end
def on_23(s) disable(STYLE_SWITCHES[:italic]) end
def on_24(s) disable(STYLE_SWITCHES[:underline]) end
def on_28(s) disable(STYLE_SWITCHES[:conceal]) end
def on_29(s) disable(STYLE_SWITCHES[:cross]) end
def on_30(s) set_fg_color(0) end
def on_31(s) set_fg_color(1) end
def on_32(s) set_fg_color(2) end
def on_33(s) set_fg_color(3) end
def on_34(s) set_fg_color(4) end
def on_35(s) set_fg_color(5) end
def on_36(s) set_fg_color(6) end
def on_37(s) set_fg_color(7) end
def on_38(s) set_fg_color_256(s) end
def on_39(s) set_fg_color(9) end
def on_40(s) set_bg_color(0) end
def on_41(s) set_bg_color(1) end
def on_42(s) set_bg_color(2) end
def on_43(s) set_bg_color(3) end
def on_44(s) set_bg_color(4) end
def on_45(s) set_bg_color(5) end
def on_46(s) set_bg_color(6) end
def on_47(s) set_bg_color(7) end
def on_48(s) set_bg_color_256(s) end
def on_49(s) set_bg_color(9) end
def on_90(s) set_fg_color(0, 'l') end
def on_91(s) set_fg_color(1, 'l') end
def on_92(s) set_fg_color(2, 'l') end
def on_93(s) set_fg_color(3, 'l') end
def on_94(s) set_fg_color(4, 'l') end
def on_95(s) set_fg_color(5, 'l') end
def on_96(s) set_fg_color(6, 'l') end
def on_97(s) set_fg_color(7, 'l') end
def on_99(s) set_fg_color(9, 'l') end
def on_100(s) set_bg_color(0, 'l') end
def on_101(s) set_bg_color(1, 'l') end
def on_102(s) set_bg_color(2, 'l') end
def on_103(s) set_bg_color(3, 'l') end
def on_104(s) set_bg_color(4, 'l') end
def on_105(s) set_bg_color(5, 'l') end
def on_106(s) set_bg_color(6, 'l') end
def on_107(s) set_bg_color(7, 'l') end
def on_109(s) set_bg_color(9, 'l') end
def convert(ansi)
@out = ""
@n_open_tags = 0
reset()
s = StringScanner.new(ansi.gsub("<", "<"))
while(!s.eos?)
if s.scan(/\e([@-_])(.*?)([@-~])/)
handle_sequence(s)
else
@out << s.scan(/./m)
end
end
close_open_tags()
@out
end
def handle_sequence(s)
indicator = s[1]
commands = s[2].split ';'
terminator = s[3]
# We are only interested in color and text style changes - triggered by
# sequences starting with '\e[' and ending with 'm'. Any other control
# sequence gets stripped (including stuff like "delete last line")
return unless indicator == '[' and terminator == 'm'
close_open_tags()
if commands.empty?()
reset()
return
end
evaluate_command_stack(commands)
css_classes = []
unless @fg_color.nil?
fg_color = @fg_color
# Most terminals show bold colored text in the light color variant
# Let's mimic that here
if @style_mask & STYLE_SWITCHES[:bold] != 0
fg_color.sub!(/fg-(\w{2,}+)/, 'fg-l-\1')
end
css_classes << fg_color
end
css_classes << @bg_color unless @bg_color.nil?
STYLE_SWITCHES.each do |css_class, flag|
css_classes << "term-#{css_class}" if @style_mask & flag != 0
end
open_new_tag(css_classes) if css_classes.length > 0
end
def evaluate_command_stack(stack)
return unless command = stack.shift()
if self.respond_to?("on_#{command}", true)
self.send("on_#{command}", stack)
end
evaluate_command_stack(stack)
end
def open_new_tag(css_classes)
@out << %{<span class="#{css_classes.join(' ')}">}
@n_open_tags += 1
end
def close_open_tags
while @n_open_tags > 0
@out << %{</span>}
@n_open_tags -= 1
end
end
def reset
@fg_color = nil
@bg_color = nil
@style_mask = 0
end
def enable(flag)
@style_mask |= flag
end
def disable(flag)
@style_mask &= ~flag
end
def set_fg_color(color_index, prefix = nil)
@fg_color = get_term_color_class(color_index, ["fg", prefix])
end
def set_bg_color(color_index, prefix = nil)
@bg_color = get_term_color_class(color_index, ["bg", prefix])
end
def get_term_color_class(color_index, prefix)
color_name = COLOR[color_index]
return nil if color_name.nil?
return get_color_class(["term", prefix, color_name])
end
def set_fg_color_256(command_stack)
css_class = get_xterm_color_class(command_stack, "fg")
@fg_color = css_class unless css_class.nil?
end
def set_bg_color_256(command_stack)
css_class = get_xterm_color_class(command_stack, "bg")
@bg_color = css_class unless css_class.nil?
end
def get_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
return get_color_class(["xterm", prefix, color_index])
end
def get_color_class(segments)
return [segments].flatten.compact.join('-')
end
end
end
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