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ANSI.py
'''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]