diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/ansi2html.rb | 240 |
1 files changed, 209 insertions, 31 deletions
diff --git a/lib/ansi2html.rb b/lib/ansi2html.rb index 59491f1..d3a85a5 100644 --- a/lib/ansi2html.rb +++ b/lib/ansi2html.rb @@ -1,44 +1,222 @@ # 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 = { - '30' => 'black', - '31' => 'red', - '32' => 'green', - '33' => 'yellow', - '34' => 'blue', - '35' => 'magenta', - '36' => 'cyan', - '37' => 'white', - '90' => 'grey' + 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) - out = "" - tag_open = false - s = StringScanner.new(ansi.gsub("<", "<")) - while(!s.eos?) - if s.scan(/\e\[(3[0-7]|90)m/) || s.scan(/\e\[1;(3[0-7])m/) - if tag_open - out << %{</span>} - end - out << %{<span class="#{COLOR[s[1]]}">} - tag_open = true - elsif s.scan(/\e\[1m/) - # Just ignore bold style - else - if s.scan(/\e\[0m/) - if tag_open - out << %{</span>} - end - tag_open = false + 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) + @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 - if tag_open - out << %{</span>} + + 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 - out end end |