@y = 0
@a = 0x000007 # cursor attributes
@partial = ''
+ @saved_normal_screen = null
+ @cursor_visible = true
+ @scroll_top = 0
+ @scroll_bottom = height - 1
@resize width, height
resize: (width, height) ->
# FIXME: write a version that retains some of the data
+ # FIXME: clamp variables (eg x, y, saved.*, scrolling region) if getting smaller
@width = width
@height = height
@text = []
@attributes[y] = []
for x in [0...width]
@text[y].push ' '
- @attributes[y].push 0
+ @attributes[y].push 0x07
# pass data from stdout
update: (data) ->
return
add_new_line: ->
- # clear top line
+ # clear the line at the top of the scrolling region
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)
+ @text[@scroll_top][i] = ' '
+ @attributes[@scroll_top][i] = 0x07
+
+ # move (newly cleared) top line to the bottom of the scrolling region
+ @text = [
+ @text[0...@scroll_top]..., # up to but not including scroll top
+ @text[@scroll_top + 1 .. @scroll_bottom]..., # scroll region except top line of it
+ @text[@scroll_top], # top line of scroll region (already cleared)
+ @text[@scroll_bottom + 1 ... @height]... # rest of screen
+ ]
+ @attributes = [
+ @attributes[0...@scroll_top]..., # up to but not including scroll top
+ @attributes[@scroll_top + 1 .. @scroll_bottom]..., # scroll region except top line of it
+ @attributes[@scroll_top], # top line of scroll region (already cleared)
+ @attributes[@scroll_bottom + 1 ... @height]... # rest of screen
+ ]
+
# slide cursor up with rest of text
@y -= 1
wrap_to_next_line: ->
- if @y is @height - 1
+ if @y is @scroll_bottom
@add_new_line()
@y += 1
@x = 0
when '\x0d' # cr
@x = 0
when '\x08' # backspace
- if @x > 0
+ if @x is 0
+ @x = @width - 1
+ if @y > 0
+ @y -= 1
+ else
@x -= 1
- @text[@y][@x] = ' '
- # should this set the attribute too?
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
- if @x is @width
- @wrap_to_next_line()
return
set_attribute_bits: (mask, value) ->
- @a = (@a & ~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
else
return deef_alt
+ # csi_@: rxvt does nothing I can detect
+
+ # move cursor up
+ csi_A: (lines) ->
+ lines = parseInt @fix_esc_arg lines, '1'
+ @y -= lines
+ if @y < 0
+ @y = 0
+ return
+
+ # move cursor down
+ csi_B: (lines) ->
+ lines = parseInt @fix_esc_arg lines, '1'
+ @y += lines
+ if @y >= @height
+ @y = @height - 1
+ return
+
+ # move cursor right
+ csi_C: (cols) ->
+ cols = parseInt @fix_esc_arg cols, '1'
+ @x += cols
+ if @x >= @width
+ @x = @width - 1
+ return
+
+ # move cursor left
+ csi_D: (cols) ->
+ cols = parseInt @fix_esc_arg cols, '1'
+ @x -= cols
+ if @x < 0
+ @x = 0
+ return
+
# 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
- if 0 <= column < @width
- @x = column
- else
- console.log "tried to move cursor to invalid column: #{column}"
- row -= 1
- if 0 <= row < @height
- @y = row
- else
- console.log "tried to move cursor to invalid row: #{row}"
+ # handle blank/missing args and convert to 0 base
+ row = -1 + parseInt @fix_esc_arg row, '1'
+ column = -1 + parseInt @fix_esc_arg 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
+ return
+
+ # 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}"
+ return
# clear (some or all of) current line
csi_K: (direction) ->
@text[@y][i] = ' '
@attributes[@y][i] = @a
when '1' # erase to left
- for i in [0...@x]
+ # @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 '0' # erase whole line
+ 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}"
+ return
+
+ # misc
+ csiq_h: ->
+ args = []
+ for i in arguments
+ arg = @fix_esc_arg i, ''
+ switch arg
+ when '25'
+ @cursor_visible = true
+ 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 0x07
+ else
+ console.log "confusing arg for csiq_h: #{arg}"
+ return
+
+ # unmisc
+ csiq_l: ->
+ args = []
+ for i in arguments
+ arg = @fix_esc_arg i, ''
+ switch arg
+ when '25'
+ @cursor_visible = false
+ 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
+ else
+ console.log "confusing arg for csiq_l: #{arg}"
+ return
# set color, bold, underline, etc
csi_m: ->
args = []
for i in arguments
- args.push @fix_esc_arg i, 0
+ args.push @fix_esc_arg i, '0'
while args.length > 0
- switch args.shift()
-
+ arg = args.shift()
+ switch arg
# remove all style/color
when '0'
- @set_attribute_bits 0xffffff, 0x000007
+ @a = 0x07
# style attributes
when '1' # bold
- @set_attribute_bits 0x10000, 0x10000
+ @set_attribute_bits 0x010000, 0x010000
+ when '3' # italic (rare)
+ @set_attribute_bits 0x200000, 0x200000
when '4' # underline
- @set_attribute_bits 0x20000, 0x20000
+ @set_attribute_bits 0x020000, 0x020000
when '5' # blink
- @set_attribute_bits 0x40000, 0x40000
- when '8' # invisible
- @set_attribute_bits 0x80000, 0x80000
+ @set_attribute_bits 0x040000, 0x040000
+ when '7' # inverse
+ @set_attribute_bits 0x080000, 0x080000
+ when '8' # invisible. urivt ignores this
+ @set_attribute_bits 0x100000, 0x100000
# 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 '21' # not bold (rare)
+ @set_attribute_bits 0x010000, 0
+ when '22' # not bold
+ @set_attribute_bits 0x010000, 0
+ when '23' # not italic (rare)
+ @set_attribute_bits 0x200000, 0
when '24' # not underline
- @set_attribute_bits 0x20000, 0
+ @set_attribute_bits 0x020000, 0
when '25' # not blink
- @set_attribute_bits 0x40000, 0
+ @set_attribute_bits 0x040000, 0
+ when '27' # not inverse
+ @set_attribute_bits 0x080000, 0
when '28' # not invisible
- @set_attribute_bits 0x80000, 0
+ @set_attribute_bits 0x100000, 0
when '100' # reset colors but not other attributes
@set_attribute_bits 0xffff, 0x0007
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
+ console.log "unrecognized csi_m arg: \"#{arg}\""
+ @a = 0
+ return
+
+ # set scrolling region
+ csi_r: (top, bottom) ->
+ top = -1 + parseInt @fix_esc_arg top, '1'
+ bottom = -1 + parseInt @fix_esc_arg bottom, '10000'
+ if top < 0
+ top = 0
+ if bottom >= @height
+ bottom = @height - 1
+ @scroll_top = top
+ @scroll_bottom = bottom
return
# str is the whole escape sequence (minus the esc[ prefix)
update_sequence: (str) ->
- command = @["csi_#{str.substr str.length - 1}"]
+ 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
Got questions, comments, patches, etc.? Contact Jason Woofenden