terminal.coffee

   1 # this file is used by the client and server.
   2
   3 # work around lack of module system in the browser:
   4 if exports?
   5         my_exports = exports
   6 else
   7         window.terminal = {}
   8         my_exports = window.terminal
   9
  10 class Terminal
  11         # public:
  12         constructor: (width, height) ->
  13                 @width = 1
  14                 @height = 1
  15                 @text = []
  16                 @attributes = []
  17                 @x = 0
  18                 @y = 0
  19                 @a = 0x000007 # cursor attributes
  20                 @partial = ''
  21                 @resize width, height
  22
  23         resize: (width, height) ->
  24                 # FIXME: write a version that retains some of the data
  25                 @width = width
  26                 @height = height
  27                 @text = []
  28                 @attributes = []
  29                 for y in [0...height]
  30                         @text[y] = []
  31                         @attributes[y] = []
  32                         for x in [0...width]
  33                                 @text[y].push ' '
  34                                 @attributes[y].push 0
  35
  36         # pass data from stdout
  37         update: (data) ->
  38                 return unless data?.length > 0
  39                 if @partial.length > 0
  40                         data = @partial + data
  41                         @partial = ''
  42                 parts = data.split(/\x1b\[/)
  43                 if parts.length > 1
  44                         if -1 is @escape_sequence_length parts[parts.length - 1]
  45                                 @partial = parts.pop()
  46                 if parts.length > 0
  47                         for i in [0...parts.length]
  48                                 if i is 0
  49                                         @update_text parts[i]
  50                                 else
  51                                         @update_sequence_then_text parts[i]
  52                 return
  53
  54         clear_rest_of_line: ->
  55                 for i in [@x...@width]
  56                         @text[@y][i] = ' '
  57                         @attributes[@y][i] = @a
  58
  59         add_new_line: ->
  60                 # clear top line
  61                 for i in [0...@width]
  62                         @text[0][i] = ' '
  63                         @attributes[0][i] = 0
  64                 # move (newly cleared) top line to the bottom
  65                 tmp = @text.shift()
  66                 @text.push(tmp)
  67                 tmp = @attributes.shift()
  68                 @attributes.push(tmp)
  69                 # slide cursor up with rest of text
  70                 @y -= 1
  71
  72         wrap_to_next_line: ->
  73                 if @y is @height - 1
  74                         @add_new_line()
  75                 @y += 1
  76                 @x = 0
  77
  78         # str has no escape sequences
  79         update_text: (str) ->
  80                 return unless str.length > 0
  81                 for c in str
  82                         switch c
  83                                 when '\t' # tab
  84                                         @update_text "        ".substr(@x % 8)
  85                                 when '\x07' # bell
  86                                         false
  87                                 when '\x0d' # cr
  88                                         @x = 0
  89                                 when '\x08' # backspace
  90                                         if @x > 0
  91                                                 @x -= 1
  92                                                 @text[@y][@x] = ' '
  93                                                 # should this set the attribute too?
  94                                 when '\x0a', '\x0b' # lf, vertical tab (same thing)
  95                                         @wrap_to_next_line()
  96                                 else
  97                                         @text[@y][@x] = c
  98                                         @attributes[@y][@x] = @a
  99                                         @x += 1
 100                                         if @x is @width
 101                                                 @wrap_to_next_line()
 102                 return
 103
 104         set_attribute_bits: (mask, value) ->
 105                 @a = (@a & ~mask) | value
 106
 107         csi_m: default: "0", go: ->
 108                 args = []
 109                 for i in arguments
 110                         args.push i
 111
 112                 while args.length > 0
 113                         fixed = args.shift()
 114                         while fixed[0] is '0'
 115                                 fixed = fixed.substr 1
 116                         if fixed is ''
 117                                 fixed = '0'
 118                         switch fixed
 119
 120                                 # remove all style/color
 121                                 when '0'
 122                                         @set_attribute_bits 0xffffff, 0x000007
 123
 124                                 # style attributes
 125                                 when '1' # bold
 126                                         @set_attribute_bits 0x10000, 0x10000
 127                                 when '4' # underline
 128                                         @set_attribute_bits 0x20000, 0x20000
 129                                 when '5' # blink
 130                                         @set_attribute_bits 0x40000, 0x40000
 131                                 when '8' # invisible
 132                                         @set_attribute_bits 0x80000, 0x80000
 133
 134                                 # disable style attributes
 135                                 when '22' # not bold... according to a page
 136                                         @set_attribute_bits 0x10000, 0
 137                                 when '21' # ... though this would make more sense for "not bold"
 138                                         @set_attribute_bits 0x10000, 0
 139                                 when '24' # not underline
 140                                         @set_attribute_bits 0x20000, 0
 141                                 when '25' # not blink
 142                                         @set_attribute_bits 0x40000, 0
 143                                 when '28' # not invisible
 144                                         @set_attribute_bits 0x80000, 0
 145
 146                                 when '100' # reset colors but not other attributes
 147                                         @set_attribute_bits 0xffff, 0x0007
 148
 149                                 # 8 fg colors
 150                                 when '30' # fg black
 151                                         @set_attribute_bits 0xff, 0x00
 152                                 when '31' # fg red
 153                                         @set_attribute_bits 0xff, 0x01
 154                                 when '32' # fg green
 155                                         @set_attribute_bits 0xff, 0x02
 156                                 when '33' # fg yellow
 157                                         @set_attribute_bits 0xff, 0x03
 158                                 when '34' # fg blue
 159                                         @set_attribute_bits 0xff, 0x04
 160                                 when '35' # fg magenta
 161                                         @set_attribute_bits 0xff, 0x05
 162                                 when '36' # fg cyan
 163                                         @set_attribute_bits 0xff, 0x06
 164                                 when '37', '39' # fg white  (39 is default)
 165                                         @set_attribute_bits 0xff, 0x07
 166
 167                                 when '38'
 168                                         if args.length >= 2 and args[0] is '5'
 169                                                 args.shift()
 170                                                 @set_attribute_bits 0xff, (0xff & args.shift())
 171                                         else
 172                                                 @set_attribute_bits 0x20000, 0x20000
 173
 174                                 # 8 bg colors
 175                                 when '40' # bg black
 176                                         @set_attribute_bits 0xff00, 0x0000
 177                                 when '41' # bg red
 178                                         @set_attribute_bits 0xff00, 0x0100
 179                                 when '42' # bg green
 180                                         @set_attribute_bits 0xff00, 0x0200
 181                                 when '43' # bg yellow
 182                                         @set_attribute_bits 0xff00, 0x0300
 183                                 when '44' # bg blue
 184                                         @set_attribute_bits 0xff00, 0x0400
 185                                 when '45' # bg magenta
 186                                         @set_attribute_bits 0xff00, 0x0500
 187                                 when '46' # bg cyan
 188                                         @set_attribute_bits 0xff00, 0x0600
 189                                 when '47' # bg white
 190                                         @set_attribute_bits 0xff00, 0x0700
 191                                 when '49' # bg default
 192                                         @set_attribute_bits 0xff00, 0x0000
 193
 194                                 when '48'
 195                                         if args.length >= 2 and args[0] is '5'
 196                                                 args.shift()
 197                                                 @set_attribute_bits 0xff00, ((0xff & args.shift()) << 8)
 198                                         else
 199                                                 @set_attribute_bits 0x20000, 0x20000
 200
 201                                 # bright fg colors
 202                                 when '90' # fg bright black
 203                                         @set_attribute_bits 0xff, 0x08
 204                                 when '91' # fg bright red
 205                                         @set_attribute_bits 0xff, 0x09
 206                                 when '92' # fg bright green
 207                                         @set_attribute_bits 0xff, 0x0a
 208                                 when '93' # fg bright yellow
 209                                         @set_attribute_bits 0xff, 0x0b
 210                                 when '94' # fg bright blue
 211                                         @set_attribute_bits 0xff, 0x0c
 212                                 when '95' # fg bright magenta
 213                                         @set_attribute_bits 0xff, 0x0d
 214                                 when '96' # fg bright cyan
 215                                         @set_attribute_bits 0xff, 0x0e
 216                                 when '97' # fg bright white
 217                                         @set_attribute_bits 0xff, 0x0f
 218
 219                                 # bright bg colors
 220                                 when '100' # bg bright black
 221                                         @set_attribute_bits 0xff, 0x08
 222                                 when '101' # bg bright red
 223                                         @set_attribute_bits 0xff, 0x09
 224                                 when '102' # bg bright green
 225                                         @set_attribute_bits 0xff, 0x0a
 226                                 when '103' # bg bright yellow
 227                                         @set_attribute_bits 0xff, 0x0b
 228                                 when '104' # bg bright blue
 229                                         @set_attribute_bits 0xff, 0x0c
 230                                 when '105' # bg bright magenta
 231                                         @set_attribute_bits 0xff, 0x0d
 232                                 when '106' # bg bright cyan
 233                                         @set_attribute_bits 0xff, 0x0e
 234                                 when '107' # bg bright white
 235                                         @set_attribute_bits 0xff, 0x0f
 236
 237
 238                                 else
 239                                         # if we don't recognize the style, go back to default
 240                                         @set_attribute_bits 0xffffff, 0
 241                 return
 242
 243         # str is the whole escape sequence (minus the esc[ prefix)
 244         update_sequence: (str) ->
 245                 command = @["csi_#{str.substr str.length - 1}"]
 246                 return unless command?
 247                 args = str.substr(0, str.length - 1).split ';'
 248                 for i in [0...args.length]
 249                         if args[i] is ''
 250                                 args[i] = command.default
 251                 command.go.call this, args...
 252
 253         update_sequence_then_text: (str) ->
 254                 len = @escape_sequence_length str
 255                 if len is -1
 256                         console.log "couldn't find escape sequence here: #{str.substr 0, 25}"
 257                         @update_text "ESC[" + str
 258                 else
 259                         @update_sequence str.substr 0, len
 260                         @update_text str.substr len
 261
 262         escape_sequence_length: (str) ->
 263                 parts = str.match(/^[0-9;?]{0,25}./)
 264                 return -1 unless parts?
 265                 return parts[0].length
 266
 267 my_exports.new = (width, height) ->
 268         return new Terminal width, height