window.terminal = {}
my_exports = window.terminal
+if console?.log?
+ log = -> console.log arguments...
+else
+ log = -> null
+
class Terminal
# public:
constructor: (width, height) ->
@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
+
+ rearrange = (a) =>
+ return [
+ a[0...@scroll_top]..., # up to but not including scroll top
+ a[@scroll_top + 1 .. @scroll_bottom]..., # scroll region except top line of it
+ a[@scroll_top], # top line of scroll region (already cleared)
+ a[@scroll_bottom + 1 ... @height]... # rest of screen
+ ]
+ @text = rearrange @text
+ @attributes = rearrange @attributes
+
# 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
@y -= lines
if @y < 0
@y = 0
+ return
# move cursor down
csi_B: (lines) ->
@y += lines
if @y >= @height
@y = @height - 1
+ return
# move cursor right
csi_C: (cols) ->
@x += cols
if @x >= @width
@x = @width - 1
+ return
# move cursor left
csi_D: (cols) ->
@x -= cols
if @x < 0
@x = 0
+ return
# set cursor position (one based)
csi_H: (row, column) ->
#move the cursor
@x = column
@y = row
+ return
# clear to screen edge(es)
csi_J: (direction) ->
@text[row][i] = ' '
@attributes[row][i] = @a
else
- console.log "confusing arg for csi_J: #{direction}"
+ log "confusing arg for csi_J: #{direction}"
return
# clear (some or all of) current line
@text[@y][i] = ' '
@attributes[@y][i] = @a
else
- console.log "confusing arg for csi_K: #{direction}"
+ log "confusing arg for csi_K: #{direction}"
return
+ # move lines downwards (arg is how far)
+ csi_L: (lines) ->
+ lines = parseInt @fix_esc_arg lines, '1'
+
+ rearrange = (a) =>
+ return [
+ a[0...@y]..., # keep everything above cursor
+ a[@scroll_bottom - lines + 1 .. @scroll_bottom]..., # we'll clear these shortly
+ a[@y..@scroll_bottom - lines]..., # lines that are moving down
+ a[@scroll_bottom + 1 ... @height]... # rest of screen
+ ]
+ @text = rearrange @text
+ @attributes = rearrange @attributes
+
+ # clear the lines we scrolled off (and put back in as "new")
+ for y in [@y...@y+lines]
+ for x in [0...@width]
+ @text[y][x] = ' '
+ @attributes[y][x] = 0x07
+
+ # move lines upwards (arg is how far)
+ # this obliterates the line under the cursor and arg-1 following it
+ csi_M: (lines) ->
+ lines = parseInt @fix_esc_arg lines, '1'
+
+ rearrange = (a) =>
+ return [
+ a[0 ... @y]..., # keep everything above cursor
+ a[@y + lines .. @scroll_bottom]..., # lines we're moving up
+ a[@y ... @y + lines]..., # recycle these
+ a[@scroll_bottom + 1 ... @height]... # keep the rest
+ ]
+ @text = rearrange @text
+ @attributes = rearrange @attributes
+
+ # clear the lines we're recycling
+ for y in [@scroll_bottom - lines + 1 .. @scroll_bottom]
+ for x in [0...@width]
+ @text[y][x] = ' '
+ @attributes[y][x] = 0x07
+
# 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"
+ 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[y] = []
for x in [0...@width]
@text[y].push ' '
- @attributes[y].push 0
+ @attributes[y].push 0x07
else
- console.log "confusing arg for csiq_h: #{arg}"
+ 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"
+ 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]
@attributes = @saved_normal_screen[3]
@saved_normal_screen = null
else
- console.log "confusing arg for csiq_l: #{arg}"
+ log "confusing arg for csiq_l: #{arg}"
+ return
# set color, bold, underline, etc
csi_m: ->
else
# if we don't recognize the style, go back to default
- console.log "unrecognized csi_m arg: \"#{arg}\""
+ 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) ->
prefix = 'csi_'
str = str.substr 1
command = @[prefix + str.substr(str.length - 1)]
if not command?
- console.log "Unrecognized sequence: ESC[#{str}"
+ 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
if len is -1
- console.log "couldn't find escape sequence here: #{str.substr 0, 25}"
+ log "couldn't find escape sequence here: #{str.substr 0, 25}"
@update_text "ESC[" + str
else
@update_sequence str.substr 0, len
Got questions, comments, patches, etc.? Contact Jason Woofenden