432 lines
13 KiB
Python
432 lines
13 KiB
Python
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'''This implements a virtual screen. This is used to support ANSI terminal
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emulation. The screen representation and state is implemented in this class.
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Most of the methods are inspired by ANSI screen control codes. The
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:class:`~pexpect.ANSI.ANSI` class extends this class to add parsing of ANSI
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escape codes.
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PEXPECT LICENSE
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This license is approved by the OSI and FSF as GPL-compatible.
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http://opensource.org/licenses/isc-license.txt
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Copyright (c) 2012, Noah Spurrier <noah@noah.org>
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PERMISSION TO USE, COPY, MODIFY, AND/OR DISTRIBUTE THIS SOFTWARE FOR ANY
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PURPOSE WITH OR WITHOUT FEE IS HEREBY GRANTED, PROVIDED THAT THE ABOVE
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COPYRIGHT NOTICE AND THIS PERMISSION NOTICE APPEAR IN ALL COPIES.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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'''
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import codecs
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import copy
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import sys
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import warnings
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warnings.warn(("pexpect.screen and pexpect.ANSI are deprecated. "
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"We recommend using pyte to emulate a terminal screen: "
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"https://pypi.python.org/pypi/pyte"),
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stacklevel=2)
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NUL = 0 # Fill character; ignored on input.
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ENQ = 5 # Transmit answerback message.
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BEL = 7 # Ring the bell.
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BS = 8 # Move cursor left.
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HT = 9 # Move cursor to next tab stop.
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LF = 10 # Line feed.
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VT = 11 # Same as LF.
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FF = 12 # Same as LF.
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CR = 13 # Move cursor to left margin or newline.
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SO = 14 # Invoke G1 character set.
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SI = 15 # Invoke G0 character set.
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XON = 17 # Resume transmission.
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XOFF = 19 # Halt transmission.
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CAN = 24 # Cancel escape sequence.
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SUB = 26 # Same as CAN.
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ESC = 27 # Introduce a control sequence.
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DEL = 127 # Fill character; ignored on input.
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SPACE = u' ' # Space or blank character.
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PY3 = (sys.version_info[0] >= 3)
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if PY3:
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unicode = str
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def constrain (n, min, max):
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'''This returns a number, n constrained to the min and max bounds. '''
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if n < min:
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return min
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if n > max:
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return max
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return n
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class screen:
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'''This object maintains the state of a virtual text screen as a
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rectangular array. This maintains a virtual cursor position and handles
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scrolling as characters are added. This supports most of the methods needed
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by an ANSI text screen. Row and column indexes are 1-based (not zero-based,
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like arrays).
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Characters are represented internally using unicode. Methods that accept
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input characters, when passed 'bytes' (which in Python 2 is equivalent to
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'str'), convert them from the encoding specified in the 'encoding'
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parameter to the constructor. Methods that return screen contents return
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unicode strings, with the exception of __str__() under Python 2. Passing
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``encoding=None`` limits the API to only accept unicode input, so passing
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bytes in will raise :exc:`TypeError`.
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'''
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def __init__(self, r=24, c=80, encoding='latin-1', encoding_errors='replace'):
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'''This initializes a blank screen of the given dimensions.'''
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self.rows = r
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self.cols = c
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self.encoding = encoding
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self.encoding_errors = encoding_errors
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if encoding is not None:
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self.decoder = codecs.getincrementaldecoder(encoding)(encoding_errors)
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else:
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self.decoder = None
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self.cur_r = 1
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self.cur_c = 1
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self.cur_saved_r = 1
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self.cur_saved_c = 1
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self.scroll_row_start = 1
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self.scroll_row_end = self.rows
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self.w = [ [SPACE] * self.cols for _ in range(self.rows)]
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def _decode(self, s):
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'''This converts from the external coding system (as passed to
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the constructor) to the internal one (unicode). '''
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if self.decoder is not None:
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return self.decoder.decode(s)
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else:
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raise TypeError("This screen was constructed with encoding=None, "
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"so it does not handle bytes.")
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def _unicode(self):
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'''This returns a printable representation of the screen as a unicode
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string (which, under Python 3.x, is the same as 'str'). The end of each
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screen line is terminated by a newline.'''
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return u'\n'.join ([ u''.join(c) for c in self.w ])
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if PY3:
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__str__ = _unicode
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else:
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__unicode__ = _unicode
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def __str__(self):
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'''This returns a printable representation of the screen. The end of
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each screen line is terminated by a newline. '''
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encoding = self.encoding or 'ascii'
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return self._unicode().encode(encoding, 'replace')
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def dump (self):
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'''This returns a copy of the screen as a unicode string. This is similar to
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__str__/__unicode__ except that lines are not terminated with line
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feeds.'''
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return u''.join ([ u''.join(c) for c in self.w ])
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def pretty (self):
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'''This returns a copy of the screen as a unicode string with an ASCII
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text box around the screen border. This is similar to
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__str__/__unicode__ except that it adds a box.'''
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top_bot = u'+' + u'-'*self.cols + u'+\n'
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return top_bot + u'\n'.join([u'|'+line+u'|' for line in unicode(self).split(u'\n')]) + u'\n' + top_bot
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def fill (self, ch=SPACE):
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if isinstance(ch, bytes):
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ch = self._decode(ch)
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self.fill_region (1,1,self.rows,self.cols, ch)
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def fill_region (self, rs,cs, re,ce, ch=SPACE):
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if isinstance(ch, bytes):
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ch = self._decode(ch)
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rs = constrain (rs, 1, self.rows)
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re = constrain (re, 1, self.rows)
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cs = constrain (cs, 1, self.cols)
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ce = constrain (ce, 1, self.cols)
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if rs > re:
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rs, re = re, rs
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if cs > ce:
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cs, ce = ce, cs
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for r in range (rs, re+1):
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for c in range (cs, ce + 1):
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self.put_abs (r,c,ch)
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def cr (self):
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'''This moves the cursor to the beginning (col 1) of the current row.
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'''
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self.cursor_home (self.cur_r, 1)
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def lf (self):
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'''This moves the cursor down with scrolling.
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'''
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old_r = self.cur_r
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self.cursor_down()
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if old_r == self.cur_r:
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self.scroll_up ()
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self.erase_line()
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def crlf (self):
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'''This advances the cursor with CRLF properties.
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The cursor will line wrap and the screen may scroll.
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'''
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self.cr ()
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self.lf ()
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def newline (self):
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'''This is an alias for crlf().
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'''
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self.crlf()
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def put_abs (self, r, c, ch):
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'''Screen array starts at 1 index.'''
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r = constrain (r, 1, self.rows)
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c = constrain (c, 1, self.cols)
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if isinstance(ch, bytes):
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ch = self._decode(ch)[0]
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else:
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ch = ch[0]
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self.w[r-1][c-1] = ch
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def put (self, ch):
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'''This puts a characters at the current cursor position.
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'''
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if isinstance(ch, bytes):
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ch = self._decode(ch)
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self.put_abs (self.cur_r, self.cur_c, ch)
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def insert_abs (self, r, c, ch):
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'''This inserts a character at (r,c). Everything under
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and to the right is shifted right one character.
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The last character of the line is lost.
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'''
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if isinstance(ch, bytes):
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ch = self._decode(ch)
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r = constrain (r, 1, self.rows)
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c = constrain (c, 1, self.cols)
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for ci in range (self.cols, c, -1):
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self.put_abs (r,ci, self.get_abs(r,ci-1))
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self.put_abs (r,c,ch)
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def insert (self, ch):
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if isinstance(ch, bytes):
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ch = self._decode(ch)
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self.insert_abs (self.cur_r, self.cur_c, ch)
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def get_abs (self, r, c):
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r = constrain (r, 1, self.rows)
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c = constrain (c, 1, self.cols)
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return self.w[r-1][c-1]
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def get (self):
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self.get_abs (self.cur_r, self.cur_c)
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def get_region (self, rs,cs, re,ce):
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'''This returns a list of lines representing the region.
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'''
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rs = constrain (rs, 1, self.rows)
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re = constrain (re, 1, self.rows)
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cs = constrain (cs, 1, self.cols)
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ce = constrain (ce, 1, self.cols)
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if rs > re:
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rs, re = re, rs
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if cs > ce:
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cs, ce = ce, cs
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sc = []
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for r in range (rs, re+1):
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line = u''
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for c in range (cs, ce + 1):
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ch = self.get_abs (r,c)
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line = line + ch
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sc.append (line)
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return sc
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def cursor_constrain (self):
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'''This keeps the cursor within the screen area.
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'''
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self.cur_r = constrain (self.cur_r, 1, self.rows)
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self.cur_c = constrain (self.cur_c, 1, self.cols)
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def cursor_home (self, r=1, c=1): # <ESC>[{ROW};{COLUMN}H
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self.cur_r = r
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self.cur_c = c
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self.cursor_constrain ()
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def cursor_back (self,count=1): # <ESC>[{COUNT}D (not confused with down)
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self.cur_c = self.cur_c - count
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self.cursor_constrain ()
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def cursor_down (self,count=1): # <ESC>[{COUNT}B (not confused with back)
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self.cur_r = self.cur_r + count
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self.cursor_constrain ()
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def cursor_forward (self,count=1): # <ESC>[{COUNT}C
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self.cur_c = self.cur_c + count
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self.cursor_constrain ()
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def cursor_up (self,count=1): # <ESC>[{COUNT}A
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self.cur_r = self.cur_r - count
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self.cursor_constrain ()
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def cursor_up_reverse (self): # <ESC> M (called RI -- Reverse Index)
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old_r = self.cur_r
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self.cursor_up()
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if old_r == self.cur_r:
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self.scroll_up()
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def cursor_force_position (self, r, c): # <ESC>[{ROW};{COLUMN}f
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'''Identical to Cursor Home.'''
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self.cursor_home (r, c)
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def cursor_save (self): # <ESC>[s
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'''Save current cursor position.'''
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self.cursor_save_attrs()
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def cursor_unsave (self): # <ESC>[u
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'''Restores cursor position after a Save Cursor.'''
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self.cursor_restore_attrs()
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def cursor_save_attrs (self): # <ESC>7
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'''Save current cursor position.'''
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self.cur_saved_r = self.cur_r
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self.cur_saved_c = self.cur_c
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def cursor_restore_attrs (self): # <ESC>8
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'''Restores cursor position after a Save Cursor.'''
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self.cursor_home (self.cur_saved_r, self.cur_saved_c)
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def scroll_constrain (self):
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'''This keeps the scroll region within the screen region.'''
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if self.scroll_row_start <= 0:
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self.scroll_row_start = 1
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if self.scroll_row_end > self.rows:
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self.scroll_row_end = self.rows
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def scroll_screen (self): # <ESC>[r
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'''Enable scrolling for entire display.'''
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self.scroll_row_start = 1
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self.scroll_row_end = self.rows
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def scroll_screen_rows (self, rs, re): # <ESC>[{start};{end}r
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'''Enable scrolling from row {start} to row {end}.'''
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self.scroll_row_start = rs
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self.scroll_row_end = re
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self.scroll_constrain()
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def scroll_down (self): # <ESC>D
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'''Scroll display down one line.'''
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# Screen is indexed from 1, but arrays are indexed from 0.
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s = self.scroll_row_start - 1
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e = self.scroll_row_end - 1
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self.w[s+1:e+1] = copy.deepcopy(self.w[s:e])
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def scroll_up (self): # <ESC>M
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'''Scroll display up one line.'''
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# Screen is indexed from 1, but arrays are indexed from 0.
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s = self.scroll_row_start - 1
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e = self.scroll_row_end - 1
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self.w[s:e] = copy.deepcopy(self.w[s+1:e+1])
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def erase_end_of_line (self): # <ESC>[0K -or- <ESC>[K
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|
|
'''Erases from the current cursor position to the end of the current
|
||
|
|
line.'''
|
||
|
|
|
||
|
|
self.fill_region (self.cur_r, self.cur_c, self.cur_r, self.cols)
|
||
|
|
|
||
|
|
def erase_start_of_line (self): # <ESC>[1K
|
||
|
|
'''Erases from the current cursor position to the start of the current
|
||
|
|
line.'''
|
||
|
|
|
||
|
|
self.fill_region (self.cur_r, 1, self.cur_r, self.cur_c)
|
||
|
|
|
||
|
|
def erase_line (self): # <ESC>[2K
|
||
|
|
'''Erases the entire current line.'''
|
||
|
|
|
||
|
|
self.fill_region (self.cur_r, 1, self.cur_r, self.cols)
|
||
|
|
|
||
|
|
def erase_down (self): # <ESC>[0J -or- <ESC>[J
|
||
|
|
'''Erases the screen from the current line down to the bottom of the
|
||
|
|
screen.'''
|
||
|
|
|
||
|
|
self.erase_end_of_line ()
|
||
|
|
self.fill_region (self.cur_r + 1, 1, self.rows, self.cols)
|
||
|
|
|
||
|
|
def erase_up (self): # <ESC>[1J
|
||
|
|
'''Erases the screen from the current line up to the top of the
|
||
|
|
screen.'''
|
||
|
|
|
||
|
|
self.erase_start_of_line ()
|
||
|
|
self.fill_region (self.cur_r-1, 1, 1, self.cols)
|
||
|
|
|
||
|
|
def erase_screen (self): # <ESC>[2J
|
||
|
|
'''Erases the screen with the background color.'''
|
||
|
|
|
||
|
|
self.fill ()
|
||
|
|
|
||
|
|
def set_tab (self): # <ESC>H
|
||
|
|
'''Sets a tab at the current position.'''
|
||
|
|
|
||
|
|
pass
|
||
|
|
|
||
|
|
def clear_tab (self): # <ESC>[g
|
||
|
|
'''Clears tab at the current position.'''
|
||
|
|
|
||
|
|
pass
|
||
|
|
|
||
|
|
def clear_all_tabs (self): # <ESC>[3g
|
||
|
|
'''Clears all tabs.'''
|
||
|
|
|
||
|
|
pass
|
||
|
|
|
||
|
|
# Insert line Esc [ Pn L
|
||
|
|
# Delete line Esc [ Pn M
|
||
|
|
# Delete character Esc [ Pn P
|
||
|
|
# Scrolling region Esc [ Pn(top);Pn(bot) r
|
||
|
|
|