window.terminal = {}
my_exports = window.terminal
+if console?.log?
+ log = -> console.log arguments...
+else
+ log = -> null
+
class Terminal
# public:
constructor: (width, height) ->
if @partial.length > 0
data = @partial + data
@partial = ''
- parts = data.split(/\x1b\[/)
+ parts = data.split(/\x1b/)
if parts.length > 1
if -1 is @escape_sequence_length parts[parts.length - 1]
@partial = parts.pop()
- if parts.length > 0
- for i in [0...parts.length]
- if i is 0
- @update_text parts[i]
- else
- @update_sequence_then_text parts[i]
+ for i in [0...parts.length]
+ if i is 0
+ @update_text parts[i]
+ else
+ @update_sequence_then_text parts[i]
return
add_new_line: ->
@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
- ]
+ 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
@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'
- # move (newly cleared) top line to the bottom of the scrolling region
- @text = [
- @text[0...@y]..., # keep everything above cursor
- @text[@scroll_bottom - lines + 1 .. @scroll_bottom]..., # we'll clear these shortly
- @text[@y..@scroll_bottom - lines]..., # lines that are moving down
- @text[@scroll_bottom + 1 ... @height]... # rest of screen
- ]
- @attributes = [
- @attributes[0...@y]..., # keep everything above cursor
- @attributes[@scroll_bottom - lines + 1 .. @scroll_bottom]..., # we'll clear these shortly
- @attributes[@y..@scroll_bottom - lines]..., # lines that are moving down
- @attributes[@scroll_bottom + 1 ... @height]... # rest of screen
- ]
+ 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]
@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 = []
@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 = []
@text[y].push ' '
@attributes[y].push 0x07
else
- console.log "confusing arg for csiq_h: #{arg}"
+ log "confusing arg for csiq_h: #{arg}"
return
# unmisc
@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
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
+ # set scroll region
csi_r: (top, bottom) ->
top = -1 + parseInt @fix_esc_arg top, '1'
bottom = -1 + parseInt @fix_esc_arg bottom, '10000'
@scroll_bottom = bottom
return
+ # move cursor up one line, if it's at the top, scroll everything down
+ esc_M: ->
+ if @y > 0
+ @csi_A '1'
+ else
+ @csi_L '1'
+
# str is the whole escape sequence (minus the esc[ prefix)
update_sequence: (str) ->
- prefix = 'csi_'
- if str[0] is '?'
- prefix = 'csiq_'
- str = str.substr 1
+ if str[0] is '['
+ prefix = 'csi_'
+ if str[1] is '?'
+ prefix = 'csiq_'
+ str = str.substr 1
+ args = str.substr(1, str.length - 2).split ';'
+ else
+ prefix = 'esc_'
+ args = [str.substr(0, str.length - 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}"
- @update_text "ESC[" + str
+ log "couldn't find escape sequence here: #{str.substr 0, 25}"
+ @update_text "ESC" + str
else
@update_sequence str.substr 0, len
@update_text str.substr len
escape_sequence_length: (str) ->
- parts = str.match(/^[0-9;?]{0,25}./)
- return -1 unless parts?
- return parts[0].length
+ if str[0] is '['
+ parts = str.match(/^\[[0-9;?]{0,25}./)
+ return -1 unless parts?
+ return parts[0].length
+ else
+ log "non[: ESC#{str.substr 0, 10}"
+ if str.length >= 1
+ return 1
+ else
+ return -1
my_exports.new = (width, height) ->
return new Terminal width, height
Got questions, comments, patches, etc.? Contact Jason Woofenden