351 lines
12 KiB
Python
351 lines
12 KiB
Python
'''This implements an ANSI (VT100) terminal emulator as a subclass of screen.
|
|
|
|
PEXPECT LICENSE
|
|
|
|
This license is approved by the OSI and FSF as GPL-compatible.
|
|
http://opensource.org/licenses/isc-license.txt
|
|
|
|
Copyright (c) 2012, Noah Spurrier <noah@noah.org>
|
|
PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
|
|
PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
|
|
COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
'''
|
|
|
|
# references:
|
|
# http://en.wikipedia.org/wiki/ANSI_escape_code
|
|
# http://www.retards.org/terminals/vt102.html
|
|
# http://vt100.net/docs/vt102-ug/contents.html
|
|
# http://vt100.net/docs/vt220-rm/
|
|
# http://www.termsys.demon.co.uk/vtansi.htm
|
|
|
|
from . import screen
|
|
from . import FSM
|
|
import string
|
|
|
|
#
|
|
# The 'Do.*' functions are helper functions for the ANSI class.
|
|
#
|
|
def DoEmit (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.write_ch(fsm.input_symbol)
|
|
|
|
def DoStartNumber (fsm):
|
|
|
|
fsm.memory.append (fsm.input_symbol)
|
|
|
|
def DoBuildNumber (fsm):
|
|
|
|
ns = fsm.memory.pop()
|
|
ns = ns + fsm.input_symbol
|
|
fsm.memory.append (ns)
|
|
|
|
def DoBackOne (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.cursor_back ()
|
|
|
|
def DoBack (fsm):
|
|
|
|
count = int(fsm.memory.pop())
|
|
screen = fsm.memory[0]
|
|
screen.cursor_back (count)
|
|
|
|
def DoDownOne (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.cursor_down ()
|
|
|
|
def DoDown (fsm):
|
|
|
|
count = int(fsm.memory.pop())
|
|
screen = fsm.memory[0]
|
|
screen.cursor_down (count)
|
|
|
|
def DoForwardOne (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.cursor_forward ()
|
|
|
|
def DoForward (fsm):
|
|
|
|
count = int(fsm.memory.pop())
|
|
screen = fsm.memory[0]
|
|
screen.cursor_forward (count)
|
|
|
|
def DoUpReverse (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.cursor_up_reverse()
|
|
|
|
def DoUpOne (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.cursor_up ()
|
|
|
|
def DoUp (fsm):
|
|
|
|
count = int(fsm.memory.pop())
|
|
screen = fsm.memory[0]
|
|
screen.cursor_up (count)
|
|
|
|
def DoHome (fsm):
|
|
|
|
c = int(fsm.memory.pop())
|
|
r = int(fsm.memory.pop())
|
|
screen = fsm.memory[0]
|
|
screen.cursor_home (r,c)
|
|
|
|
def DoHomeOrigin (fsm):
|
|
|
|
c = 1
|
|
r = 1
|
|
screen = fsm.memory[0]
|
|
screen.cursor_home (r,c)
|
|
|
|
def DoEraseDown (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.erase_down()
|
|
|
|
def DoErase (fsm):
|
|
|
|
arg = int(fsm.memory.pop())
|
|
screen = fsm.memory[0]
|
|
if arg == 0:
|
|
screen.erase_down()
|
|
elif arg == 1:
|
|
screen.erase_up()
|
|
elif arg == 2:
|
|
screen.erase_screen()
|
|
|
|
def DoEraseEndOfLine (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.erase_end_of_line()
|
|
|
|
def DoEraseLine (fsm):
|
|
|
|
arg = int(fsm.memory.pop())
|
|
screen = fsm.memory[0]
|
|
if arg == 0:
|
|
screen.erase_end_of_line()
|
|
elif arg == 1:
|
|
screen.erase_start_of_line()
|
|
elif arg == 2:
|
|
screen.erase_line()
|
|
|
|
def DoEnableScroll (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.scroll_screen()
|
|
|
|
def DoCursorSave (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.cursor_save_attrs()
|
|
|
|
def DoCursorRestore (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
screen.cursor_restore_attrs()
|
|
|
|
def DoScrollRegion (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
r2 = int(fsm.memory.pop())
|
|
r1 = int(fsm.memory.pop())
|
|
screen.scroll_screen_rows (r1,r2)
|
|
|
|
def DoMode (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
mode = fsm.memory.pop() # Should be 4
|
|
# screen.setReplaceMode ()
|
|
|
|
def DoLog (fsm):
|
|
|
|
screen = fsm.memory[0]
|
|
fsm.memory = [screen]
|
|
fout = open ('log', 'a')
|
|
fout.write (fsm.input_symbol + ',' + fsm.current_state + '\n')
|
|
fout.close()
|
|
|
|
class term (screen.screen):
|
|
|
|
'''This class is an abstract, generic terminal.
|
|
This does nothing. This is a placeholder that
|
|
provides a common base class for other terminals
|
|
such as an ANSI terminal. '''
|
|
|
|
def __init__ (self, r=24, c=80, *args, **kwargs):
|
|
|
|
screen.screen.__init__(self, r,c,*args,**kwargs)
|
|
|
|
class ANSI (term):
|
|
'''This class implements an ANSI (VT100) terminal.
|
|
It is a stream filter that recognizes ANSI terminal
|
|
escape sequences and maintains the state of a screen object. '''
|
|
|
|
def __init__ (self, r=24,c=80,*args,**kwargs):
|
|
|
|
term.__init__(self,r,c,*args,**kwargs)
|
|
|
|
#self.screen = screen (24,80)
|
|
self.state = FSM.FSM ('INIT',[self])
|
|
self.state.set_default_transition (DoLog, 'INIT')
|
|
self.state.add_transition_any ('INIT', DoEmit, 'INIT')
|
|
self.state.add_transition ('\x1b', 'INIT', None, 'ESC')
|
|
self.state.add_transition_any ('ESC', DoLog, 'INIT')
|
|
self.state.add_transition ('(', 'ESC', None, 'G0SCS')
|
|
self.state.add_transition (')', 'ESC', None, 'G1SCS')
|
|
self.state.add_transition_list ('AB012', 'G0SCS', None, 'INIT')
|
|
self.state.add_transition_list ('AB012', 'G1SCS', None, 'INIT')
|
|
self.state.add_transition ('7', 'ESC', DoCursorSave, 'INIT')
|
|
self.state.add_transition ('8', 'ESC', DoCursorRestore, 'INIT')
|
|
self.state.add_transition ('M', 'ESC', DoUpReverse, 'INIT')
|
|
self.state.add_transition ('>', 'ESC', DoUpReverse, 'INIT')
|
|
self.state.add_transition ('<', 'ESC', DoUpReverse, 'INIT')
|
|
self.state.add_transition ('=', 'ESC', None, 'INIT') # Selects application keypad.
|
|
self.state.add_transition ('#', 'ESC', None, 'GRAPHICS_POUND')
|
|
self.state.add_transition_any ('GRAPHICS_POUND', None, 'INIT')
|
|
self.state.add_transition ('[', 'ESC', None, 'ELB')
|
|
# ELB means Escape Left Bracket. That is ^[[
|
|
self.state.add_transition ('H', 'ELB', DoHomeOrigin, 'INIT')
|
|
self.state.add_transition ('D', 'ELB', DoBackOne, 'INIT')
|
|
self.state.add_transition ('B', 'ELB', DoDownOne, 'INIT')
|
|
self.state.add_transition ('C', 'ELB', DoForwardOne, 'INIT')
|
|
self.state.add_transition ('A', 'ELB', DoUpOne, 'INIT')
|
|
self.state.add_transition ('J', 'ELB', DoEraseDown, 'INIT')
|
|
self.state.add_transition ('K', 'ELB', DoEraseEndOfLine, 'INIT')
|
|
self.state.add_transition ('r', 'ELB', DoEnableScroll, 'INIT')
|
|
self.state.add_transition ('m', 'ELB', self.do_sgr, 'INIT')
|
|
self.state.add_transition ('?', 'ELB', None, 'MODECRAP')
|
|
self.state.add_transition_list (string.digits, 'ELB', DoStartNumber, 'NUMBER_1')
|
|
self.state.add_transition_list (string.digits, 'NUMBER_1', DoBuildNumber, 'NUMBER_1')
|
|
self.state.add_transition ('D', 'NUMBER_1', DoBack, 'INIT')
|
|
self.state.add_transition ('B', 'NUMBER_1', DoDown, 'INIT')
|
|
self.state.add_transition ('C', 'NUMBER_1', DoForward, 'INIT')
|
|
self.state.add_transition ('A', 'NUMBER_1', DoUp, 'INIT')
|
|
self.state.add_transition ('J', 'NUMBER_1', DoErase, 'INIT')
|
|
self.state.add_transition ('K', 'NUMBER_1', DoEraseLine, 'INIT')
|
|
self.state.add_transition ('l', 'NUMBER_1', DoMode, 'INIT')
|
|
### It gets worse... the 'm' code can have infinite number of
|
|
### number;number;number before it. I've never seen more than two,
|
|
### but the specs say it's allowed. crap!
|
|
self.state.add_transition ('m', 'NUMBER_1', self.do_sgr, 'INIT')
|
|
### LED control. Same implementation problem as 'm' code.
|
|
self.state.add_transition ('q', 'NUMBER_1', self.do_decsca, 'INIT')
|
|
|
|
# \E[?47h switch to alternate screen
|
|
# \E[?47l restores to normal screen from alternate screen.
|
|
self.state.add_transition_list (string.digits, 'MODECRAP', DoStartNumber, 'MODECRAP_NUM')
|
|
self.state.add_transition_list (string.digits, 'MODECRAP_NUM', DoBuildNumber, 'MODECRAP_NUM')
|
|
self.state.add_transition ('l', 'MODECRAP_NUM', self.do_modecrap, 'INIT')
|
|
self.state.add_transition ('h', 'MODECRAP_NUM', self.do_modecrap, 'INIT')
|
|
|
|
#RM Reset Mode Esc [ Ps l none
|
|
self.state.add_transition (';', 'NUMBER_1', None, 'SEMICOLON')
|
|
self.state.add_transition_any ('SEMICOLON', DoLog, 'INIT')
|
|
self.state.add_transition_list (string.digits, 'SEMICOLON', DoStartNumber, 'NUMBER_2')
|
|
self.state.add_transition_list (string.digits, 'NUMBER_2', DoBuildNumber, 'NUMBER_2')
|
|
self.state.add_transition_any ('NUMBER_2', DoLog, 'INIT')
|
|
self.state.add_transition ('H', 'NUMBER_2', DoHome, 'INIT')
|
|
self.state.add_transition ('f', 'NUMBER_2', DoHome, 'INIT')
|
|
self.state.add_transition ('r', 'NUMBER_2', DoScrollRegion, 'INIT')
|
|
### It gets worse... the 'm' code can have infinite number of
|
|
### number;number;number before it. I've never seen more than two,
|
|
### but the specs say it's allowed. crap!
|
|
self.state.add_transition ('m', 'NUMBER_2', self.do_sgr, 'INIT')
|
|
### LED control. Same problem as 'm' code.
|
|
self.state.add_transition ('q', 'NUMBER_2', self.do_decsca, 'INIT')
|
|
self.state.add_transition (';', 'NUMBER_2', None, 'SEMICOLON_X')
|
|
|
|
# Create a state for 'q' and 'm' which allows an infinite number of ignored numbers
|
|
self.state.add_transition_any ('SEMICOLON_X', DoLog, 'INIT')
|
|
self.state.add_transition_list (string.digits, 'SEMICOLON_X', DoStartNumber, 'NUMBER_X')
|
|
self.state.add_transition_list (string.digits, 'NUMBER_X', DoBuildNumber, 'NUMBER_X')
|
|
self.state.add_transition_any ('NUMBER_X', DoLog, 'INIT')
|
|
self.state.add_transition ('m', 'NUMBER_X', self.do_sgr, 'INIT')
|
|
self.state.add_transition ('q', 'NUMBER_X', self.do_decsca, 'INIT')
|
|
self.state.add_transition (';', 'NUMBER_X', None, 'SEMICOLON_X')
|
|
|
|
def process (self, c):
|
|
"""Process a single character. Called by :meth:`write`."""
|
|
if isinstance(c, bytes):
|
|
c = self._decode(c)
|
|
self.state.process(c)
|
|
|
|
def process_list (self, l):
|
|
|
|
self.write(l)
|
|
|
|
def write (self, s):
|
|
"""Process text, writing it to the virtual screen while handling
|
|
ANSI escape codes.
|
|
"""
|
|
if isinstance(s, bytes):
|
|
s = self._decode(s)
|
|
for c in s:
|
|
self.process(c)
|
|
|
|
def flush (self):
|
|
pass
|
|
|
|
def write_ch (self, ch):
|
|
'''This puts a character at the current cursor position. The cursor
|
|
position is moved forward with wrap-around, but no scrolling is done if
|
|
the cursor hits the lower-right corner of the screen. '''
|
|
|
|
if isinstance(ch, bytes):
|
|
ch = self._decode(ch)
|
|
|
|
#\r and \n both produce a call to cr() and lf(), respectively.
|
|
ch = ch[0]
|
|
|
|
if ch == u'\r':
|
|
self.cr()
|
|
return
|
|
if ch == u'\n':
|
|
self.crlf()
|
|
return
|
|
if ch == chr(screen.BS):
|
|
self.cursor_back()
|
|
return
|
|
self.put_abs(self.cur_r, self.cur_c, ch)
|
|
old_r = self.cur_r
|
|
old_c = self.cur_c
|
|
self.cursor_forward()
|
|
if old_c == self.cur_c:
|
|
self.cursor_down()
|
|
if old_r != self.cur_r:
|
|
self.cursor_home (self.cur_r, 1)
|
|
else:
|
|
self.scroll_up ()
|
|
self.cursor_home (self.cur_r, 1)
|
|
self.erase_line()
|
|
|
|
def do_sgr (self, fsm):
|
|
'''Select Graphic Rendition, e.g. color. '''
|
|
screen = fsm.memory[0]
|
|
fsm.memory = [screen]
|
|
|
|
def do_decsca (self, fsm):
|
|
'''Select character protection attribute. '''
|
|
screen = fsm.memory[0]
|
|
fsm.memory = [screen]
|
|
|
|
def do_modecrap (self, fsm):
|
|
'''Handler for \x1b[?<number>h and \x1b[?<number>l. If anyone
|
|
wanted to actually use these, they'd need to add more states to the
|
|
FSM rather than just improve or override this method. '''
|
|
screen = fsm.memory[0]
|
|
fsm.memory = [screen]
|