-async = require 'async'
-fs = require 'fs'
+# this file is used by the client and server.
+
+# work around lack of module system in the browser:
+if exports?
+ my_exports = exports
+else
+ window.terminal = {}
+ my_exports = window.terminal
class Terminal
# public:
constructor: (width, height) ->
@width = 1
@height = 1
- @text = [""]
- @attributes = [0]
+ @text = []
+ @attributes = []
@x = 0
@y = 0
+ @a = 0x000007 # cursor attributes
@partial = ''
+ @saved_normal_screen = null
@resize width, height
- @text_callbacks = []
- @sequence_callbacks = []
-
- on: (evt, callback) ->
- @["#{evt}_callbacks"].push callback
resize: (width, height) ->
# FIXME: write a version that retains some of the data
+ @width = width
+ @height = height
@text = []
@attributes = []
- for i in [0...height]
- @text[i] = ""
- @attributes[i] = new Array(width)
+ for y in [0...height]
+ @text[y] = []
+ @attributes[y] = []
+ for x in [0...width]
+ @text[y].push ' '
+ @attributes[y].push 0
# pass data from stdout
update: (data) ->
@update_sequence_then_text parts[i]
return
+ add_new_line: ->
+ # clear top line
+ for i in [0...@width]
+ @text[0][i] = ' '
+ @attributes[0][i] = 0
+ # move (newly cleared) top line to the bottom
+ tmp = @text.shift()
+ @text.push(tmp)
+ tmp = @attributes.shift()
+ @attributes.push(tmp)
+ # slide cursor up with rest of text
+ @y -= 1
+
+ wrap_to_next_line: ->
+ if @y is @height - 1
+ @add_new_line()
+ @y += 1
+ @x = 0
+
# str has no escape sequences
update_text: (str) ->
return unless str.length > 0
- for c in @text_callbacks
- c str
- console.log "text: \"#{str}\"" # FIXME
+ for c in str
+ switch c
+ when '\t' # tab
+ @update_text " ".substr(@x % 8)
+ when '\x07' # bell
+ false
+ when '\x0d' # cr
+ @x = 0
+ when '\x08' # backspace
+ if @x is 0
+ @x = @width - 1
+ if @y > 0
+ @y -= 1
+ else
+ @x -= 1
+ when '\x0a', '\x0b' # lf, vertical tab (same thing)
+ @wrap_to_next_line()
+ else
+ if @x >= @width
+ @wrap_to_next_line()
+ @text[@y][@x] = c
+ @attributes[@y][@x] = @a
+ @x += 1
+ return
+
+ set_attribute_bits: (mask, value) ->
+ @a = (@a & ~mask) | value
+
+ # we're supposed to ignore leeding zeros, and while we're at it, lets swap
+ # in the default for blank or missing values
+ fix_esc_arg: (value, deef_alt) ->
+ if value? and value != ''
+ while value[0] is '0' and value.length > 1
+ value = value.substr 1
+ return value
+ else
+ return deef_alt
+
+ # set cursor position (one based)
+ csi_H: (row, column) ->
+ row = 0 + @fix_esc_arg row, 1
+ column = 0 + @fix_esc_arg column, 1
+
+ # convert to 0 base
+ column -= 1
+
+ #clamp values
+ if column < 0
+ column = 0
+ else if column >= @width
+ column = @width - 1
+ if row < 0
+ row = 0
+ if row >= @height
+ row = @height - 1
+
+ #move the cursor
+ @x = column
+ @y = row
+
+ # clear to screen edge(es)
+ csi_J: (direction) ->
+ switch @fix_esc_arg direction, '0'
+ when '0' # erase down
+ # rest of current line
+ @csi_K direction
+ # rest of lines
+ for row in [@y...@height]
+ for i in [0...@width]
+ @text[row][i] = ' '
+ @attributes[row][i] = @a
+ when '1' # erase up
+ # beginning of current line
+ @csi_K direction
+ # all previous lines
+ for row in [0..@y]
+ for i in [0...@width]
+ @text[row][i] = ' '
+ @attributes[row][i] = @a
+ when '2' # erase everything
+ for row in [0...@height]
+ for i in [0...@width]
+ @text[row][i] = ' '
+ @attributes[row][i] = @a
+ else
+ console.log "confusing arg for csi_J: #{direction}"
+
+ # clear (some or all of) current line
+ csi_K: (direction) ->
+ switch @fix_esc_arg direction, '0'
+ when '0' # erase to right
+ for i in [@x...@width]
+ @text[@y][i] = ' '
+ @attributes[@y][i] = @a
+ when '1' # erase to left
+ # @x can equal @width (after printing to right-most column)
+ if @x < @width
+ max = @x
+ else
+ max = @width - 1
+ for i in [0..max]
+ @text[@y][i] = ' '
+ @attributes[@y][i] = @a
+ when '2' # erase whole line
+ for i in [0...@width]
+ @text[@y][i] = ' '
+ @attributes[@y][i] = @a
+ else
+ console.log "confusing arg for csi_K: #{direction}"
+
+ # misc
+ csiq_h: ->
+ args = []
+ for i in arguments
+ switch @fix_esc_arg i, ''
+ when '1049'
+ if @saved_normal_screen?
+ console.log "ignoring request to switch to the alt screen because we're already on the alt screen"
+ return
+ @saved_normal_screen = [@x, @y, @text, @attributes]
+ @text = []
+ @attributes = []
+ for y in [0...@height]
+ @text[y] = []
+ @attributes[y] = []
+ for x in [0...@width]
+ @text[y].push ' '
+ @attributes[y].push 0
+ # unmisc
+ csiq_l: ->
+ args = []
+ for i in arguments
+ switch @fix_esc_arg i, ''
+ when '1049'
+ if not @saved_normal_screen?
+ console.log "ignoring request to switch to the normal screen because we're already on the normal screen"
+ return
+ @x = @saved_normal_screen[0]
+ @y = @saved_normal_screen[1]
+ @text = @saved_normal_screen[2]
+ @attributes = @saved_normal_screen[3]
+ @saved_normal_screen = null
+
+ # set color, bold, underline, etc
+ csi_m: ->
+ args = []
+ for i in arguments
+ args.push @fix_esc_arg i, 0
+
+ while args.length > 0
+ switch args.shift()
+
+ # remove all style/color
+ when '0'
+ @set_attribute_bits 0xffffff, 0x000007
+
+ # style attributes
+ when '1' # bold
+ @set_attribute_bits 0x10000, 0x10000
+ when '4' # underline
+ @set_attribute_bits 0x20000, 0x20000
+ when '5' # blink
+ @set_attribute_bits 0x40000, 0x40000
+ when '8' # invisible
+ @set_attribute_bits 0x80000, 0x80000
+
+ # disable style attributes
+ when '22' # not bold... according to a page
+ @set_attribute_bits 0x10000, 0
+ when '21' # ... though this would make more sense for "not bold"
+ @set_attribute_bits 0x10000, 0
+ when '24' # not underline
+ @set_attribute_bits 0x20000, 0
+ when '25' # not blink
+ @set_attribute_bits 0x40000, 0
+ when '28' # not invisible
+ @set_attribute_bits 0x80000, 0
+
+ when '100' # reset colors but not other attributes
+ @set_attribute_bits 0xffff, 0x0007
+
+ # 8 fg colors
+ when '30' # fg black
+ @set_attribute_bits 0xff, 0x00
+ when '31' # fg red
+ @set_attribute_bits 0xff, 0x01
+ when '32' # fg green
+ @set_attribute_bits 0xff, 0x02
+ when '33' # fg yellow
+ @set_attribute_bits 0xff, 0x03
+ when '34' # fg blue
+ @set_attribute_bits 0xff, 0x04
+ when '35' # fg magenta
+ @set_attribute_bits 0xff, 0x05
+ when '36' # fg cyan
+ @set_attribute_bits 0xff, 0x06
+ when '37', '39' # fg white (39 is default)
+ @set_attribute_bits 0xff, 0x07
+
+ when '38'
+ if args.length >= 2 and args[0] is '5'
+ args.shift()
+ @set_attribute_bits 0xff, (0xff & args.shift())
+ else
+ @set_attribute_bits 0x20000, 0x20000
+
+ # 8 bg colors
+ when '40' # bg black
+ @set_attribute_bits 0xff00, 0x0000
+ when '41' # bg red
+ @set_attribute_bits 0xff00, 0x0100
+ when '42' # bg green
+ @set_attribute_bits 0xff00, 0x0200
+ when '43' # bg yellow
+ @set_attribute_bits 0xff00, 0x0300
+ when '44' # bg blue
+ @set_attribute_bits 0xff00, 0x0400
+ when '45' # bg magenta
+ @set_attribute_bits 0xff00, 0x0500
+ when '46' # bg cyan
+ @set_attribute_bits 0xff00, 0x0600
+ when '47' # bg white
+ @set_attribute_bits 0xff00, 0x0700
+ when '49' # bg default
+ @set_attribute_bits 0xff00, 0x0000
+
+ when '48'
+ if args.length >= 2 and args[0] is '5'
+ args.shift()
+ @set_attribute_bits 0xff00, ((0xff & args.shift()) << 8)
+ else
+ @set_attribute_bits 0x20000, 0x20000
+
+ # bright fg colors
+ when '90' # fg bright black
+ @set_attribute_bits 0xff, 0x08
+ when '91' # fg bright red
+ @set_attribute_bits 0xff, 0x09
+ when '92' # fg bright green
+ @set_attribute_bits 0xff, 0x0a
+ when '93' # fg bright yellow
+ @set_attribute_bits 0xff, 0x0b
+ when '94' # fg bright blue
+ @set_attribute_bits 0xff, 0x0c
+ when '95' # fg bright magenta
+ @set_attribute_bits 0xff, 0x0d
+ when '96' # fg bright cyan
+ @set_attribute_bits 0xff, 0x0e
+ when '97' # fg bright white
+ @set_attribute_bits 0xff, 0x0f
+
+ # bright bg colors
+ when '100' # bg bright black
+ @set_attribute_bits 0xff, 0x08
+ when '101' # bg bright red
+ @set_attribute_bits 0xff, 0x09
+ when '102' # bg bright green
+ @set_attribute_bits 0xff, 0x0a
+ when '103' # bg bright yellow
+ @set_attribute_bits 0xff, 0x0b
+ when '104' # bg bright blue
+ @set_attribute_bits 0xff, 0x0c
+ when '105' # bg bright magenta
+ @set_attribute_bits 0xff, 0x0d
+ when '106' # bg bright cyan
+ @set_attribute_bits 0xff, 0x0e
+ when '107' # bg bright white
+ @set_attribute_bits 0xff, 0x0f
+
+
+ else
+ # if we don't recognize the style, go back to default
+ @set_attribute_bits 0xffffff, 0
+ return
# str is the whole escape sequence (minus the esc[ prefix)
update_sequence: (str) ->
- for c in @sequence_callbacks
- c str
- console.log "sequence: \"#{str}\"" # FIXME
+ prefix = 'csi_'
+ if str[0] is '?'
+ prefix = 'csiq_'
+ str = str.substr 1
+ command = @[prefix + str.substr(str.length - 1)]
+ if not command?
+ console.log "Unrecognized sequence: ESC[#{str}"
+ return
+ args = str.substr(0, str.length - 1).split ';'
+ command.call this, args...
update_sequence_then_text: (str) ->
len = @escape_sequence_length str
return -1 unless parts?
return parts[0].length
-exports.new = (width, height) ->
+my_exports.new = (width, height) ->
return new Terminal width, height
Got questions, comments, patches, etc.? Contact Jason Woofenden