mirror of
https://github.com/python/cpython.git
synced 2024-12-01 03:01:36 +01:00
329 lines
8.0 KiB
Python
Executable File
329 lines
8.0 KiB
Python
Executable File
# VT100 terminal emulator.
|
|
# This is incomplete and slow, but will do for now...
|
|
# It shouldn't be difficult to extend it to be a more-or-less complete
|
|
# VT100 emulator. And little bit of profiling could go a long way...
|
|
|
|
from array import array
|
|
import regex
|
|
import string
|
|
|
|
# Tunable parameters
|
|
DEBUGLEVEL = 1
|
|
|
|
# Symbolic constants
|
|
ESC = '\033'
|
|
|
|
|
|
# VT100 emulation class
|
|
|
|
class VT100:
|
|
|
|
def __init__(self):
|
|
self.debuglevel = DEBUGLEVEL
|
|
# Unchangeable parameters (for now)
|
|
self.width = 80
|
|
self.height = 24
|
|
self.blankline = array('c', ' '*self.width)
|
|
self.blankattr = array('b', '\0'*self.width)
|
|
# Set mutable display state
|
|
self.reset()
|
|
# Set parser state
|
|
self.unfinished = ''
|
|
# Set screen recognition state
|
|
self.reset_recognizer()
|
|
|
|
def msg(self, msg, *args):
|
|
if self.debuglevel > 0:
|
|
print 'VT100:', msg%args
|
|
|
|
def set_debuglevel(self, debuglevel):
|
|
self.debuglevel = debuglevel
|
|
|
|
def reset(self):
|
|
self.lines = []
|
|
self.attrs = []
|
|
self.fill_bottom()
|
|
self.x = 0
|
|
self.y = 0
|
|
self.curattrs = []
|
|
|
|
def show(self):
|
|
lineno = 0
|
|
for line in self.lines:
|
|
lineno = lineno + 1
|
|
i = len(line)
|
|
while i > 0 and line[i-1] == ' ': i = i-1
|
|
print line[:i]
|
|
print 'CURSOR:', self.x, self.y
|
|
|
|
def fill_bottom(self):
|
|
while len(self.lines) < self.height:
|
|
self.lines.append(self.blankline[:])
|
|
self.attrs.append(self.blankattr[:])
|
|
|
|
def fill_top(self):
|
|
while len(self.lines) < self.height:
|
|
self.lines.insert(0, self.blankline[:])
|
|
self.attrs.insert(0, self.blankattr[:])
|
|
|
|
def clear_all(self):
|
|
self.lines = []
|
|
self.attrs = []
|
|
self.fill_bottom()
|
|
|
|
def clear_below(self):
|
|
del self.lines[self.y:]
|
|
del self.attrs[self.y:]
|
|
self.fill_bottom()
|
|
|
|
def clear_above(self):
|
|
del self.lines[:self.y]
|
|
del self.attrs[:self.y]
|
|
self.fill_top()
|
|
|
|
def send(self, buffer):
|
|
self.msg('send: unfinished=%s, buffer=%s',
|
|
`self.unfinished`, `buffer`)
|
|
self.unfinished = self.unfinished + buffer
|
|
i = 0
|
|
n = len(self.unfinished)
|
|
while i < n:
|
|
c = self.unfinished[i]
|
|
i = i+1
|
|
if c != ESC:
|
|
self.add_char(c)
|
|
continue
|
|
if i >= n:
|
|
i = i-1
|
|
break
|
|
c = self.unfinished[i]
|
|
i = i+1
|
|
if c == 'c':
|
|
self.reset()
|
|
continue
|
|
if c <> '[':
|
|
self.msg('unrecognized: ESC %s', `c`)
|
|
continue
|
|
argstr = ''
|
|
while i < n:
|
|
c = self.unfinished[i]
|
|
i = i+1
|
|
if c not in '0123456789;':
|
|
break
|
|
argstr = argstr + c
|
|
else:
|
|
i = i - len(argstr) - 2
|
|
break
|
|
## self.msg('found ESC [ %s %s' % (`argstr`, `c`))
|
|
args = string.splitfields(argstr, ';')
|
|
for j in range(len(args)):
|
|
s = args[j]
|
|
while s[:1] == '0': s = s[1:]
|
|
if s: args[j] = eval(s)
|
|
else: args[j] = 0
|
|
p1 = p2 = 0
|
|
if args: p1 = args[0]
|
|
if args[1:]: p2 = args[1]
|
|
if c in '@ABCDH':
|
|
if not p1: p1 = 1
|
|
if c in 'H':
|
|
if not p2: p2 = 1
|
|
if c == '@':
|
|
for j in range(p1):
|
|
self.add_char(' ')
|
|
elif c == 'A':
|
|
self.move_by(0, -p1)
|
|
elif c == 'B':
|
|
self.move_by(0, p1)
|
|
elif c == 'C':
|
|
self.move_by(p1, 0)
|
|
elif c == 'D':
|
|
self.move_by(-p1, 0)
|
|
elif c == 'H':
|
|
self.move_to(p2-1, p1-1)
|
|
elif c == 'J':
|
|
if p1 == 0: self.clear_above()
|
|
elif p1 == 1: self.clear_below()
|
|
elif p1 == 2: self.clear_all()
|
|
else: self.msg('weird ESC [ %d J', p1)
|
|
elif c == 'K':
|
|
if p1 == 0: self.erase_right()
|
|
elif p1 == 1: self.erase_left()
|
|
elif p1 == 2: self.erase_line()
|
|
else: self.msg('weird ESC [ %d K', p1)
|
|
elif c == 'm':
|
|
if p1 == 0:
|
|
self.curattrs = []
|
|
else:
|
|
if p1 not in self.curattrs:
|
|
self.curattrs.append(p1)
|
|
self.curattrs.sort()
|
|
else:
|
|
self.msg('unrecognized: ESC [ %s', `argstr+c`)
|
|
self.unfinished = self.unfinished[i:]
|
|
|
|
def add_char(self, c):
|
|
if c == '\r':
|
|
self.move_to(0, self.y)
|
|
return
|
|
if c in '\n\f\v':
|
|
self.move_to(self.x, self.y + 1)
|
|
if self.y >= self.height:
|
|
self.scroll_up(1)
|
|
self.move_to(self.x, self.height - 1)
|
|
return
|
|
if c == '\b':
|
|
self.move_by(-1, 0)
|
|
return
|
|
if c == '\a':
|
|
self.msg('BELL')
|
|
return
|
|
if c == '\t':
|
|
self.move_to((self.x+8)/8*8, self.y)
|
|
return
|
|
if c == '\0':
|
|
return
|
|
if c < ' ' or c > '~':
|
|
self.msg('ignored control char: %s', `c`)
|
|
return
|
|
if self.x >= self.width:
|
|
self.move_to(0, self.y + 1)
|
|
if self.y >= self.height:
|
|
self.scroll_up(1)
|
|
self.move_to(self.x, self.height - 1)
|
|
self.lines[self.y][self.x] = c
|
|
if self.curattrs:
|
|
self.attrs[self.y][self.x] = max(self.curattrs)
|
|
else:
|
|
self.attrs[self.y][self.x] = 0
|
|
self.move_by(1, 0)
|
|
|
|
def move_to(self, x, y):
|
|
self.x = min(max(0, x), self.width)
|
|
self.y = min(max(0, y), self.height)
|
|
|
|
def move_by(self, dx, dy):
|
|
self.move_to(self.x + dx, self.y + dy)
|
|
|
|
def scroll_up(self, nlines):
|
|
del self.lines[:max(0, nlines)]
|
|
del self.attrs[:max(0, nlines)]
|
|
self.fill_bottom()
|
|
|
|
def scroll_down(self, nlines):
|
|
del self.lines[-max(0, nlines):]
|
|
del self.attrs[-max(0, nlines):]
|
|
self.fill_top()
|
|
|
|
def erase_left(self):
|
|
x = min(self.width-1, x)
|
|
y = min(self.height-1, y)
|
|
self.lines[y][:x] = self.blankline[:x]
|
|
self.attrs[y][:x] = self.blankattr[:x]
|
|
|
|
def erase_right(self):
|
|
x = min(self.width-1, x)
|
|
y = min(self.height-1, y)
|
|
self.lines[y][x:] = self.blankline[x:]
|
|
self.attrs[y][x:] = self.blankattr[x:]
|
|
|
|
def erase_line(self):
|
|
self.lines[y][:] = self.blankline
|
|
self.attrs[y][:] = self.blankattr
|
|
|
|
# The following routines help automating the recognition of
|
|
# standard screens. A standard screen is characterized by
|
|
# a number of fields. A field is part of a line,
|
|
# characterized by a (lineno, begin, end) tuple;
|
|
# e.g. the first 10 characters of the second line are
|
|
# specified by the tuple (1, 0, 10). Fields can be:
|
|
# - regex: desired contents given by a regular expression,
|
|
# - extract: can be extracted,
|
|
# - cursor: screen is only valid if cursor in field,
|
|
# - copy: identical to another screen (position is ignored).
|
|
# A screen is defined as a dictionary full of fields. Screens
|
|
# also have names and are placed in a dictionary.
|
|
|
|
def reset_recognizer(self):
|
|
self.screens = {}
|
|
|
|
def define_screen(self, screenname, fields):
|
|
fieldscopy = {}
|
|
# Check if the fields make sense
|
|
for fieldname in fields.keys():
|
|
field = fields[fieldname]
|
|
ftype, lineno, begin, end, extra = field
|
|
if ftype in ('match', 'search'):
|
|
extra = regex.compile(extra)
|
|
elif ftype == 'extract':
|
|
extra = None
|
|
elif ftype == 'cursor':
|
|
extra = None
|
|
elif ftype == 'copy':
|
|
if not self.screens.has_key(extra):
|
|
raise ValueError, 'bad copy ref'
|
|
else:
|
|
raise ValueError, 'bad ftype: %s' % `ftype`
|
|
fieldscopy[fieldname] = (
|
|
ftype, lineno, begin, end, extra)
|
|
self.screens[screenname] = fieldscopy
|
|
|
|
def which_screens(self):
|
|
self.busy = []
|
|
self.okay = []
|
|
self.fail = []
|
|
for name in self.screens.keys():
|
|
ok = self.match_screen(name)
|
|
return self.okay[:]
|
|
|
|
def match_screen(self, name):
|
|
if name in self.busy: raise RuntimeError, 'recursive match'
|
|
if name in self.okay: return 1
|
|
if name in self.fail: return 0
|
|
self.busy.append(name)
|
|
fields = self.screens[name]
|
|
ok = 0
|
|
for key in fields.keys():
|
|
field = fields[key]
|
|
ftype, lineno, begin, end, extra = field
|
|
if ftype == 'copy':
|
|
if not self.match_screen(extra): break
|
|
elif ftype == 'search':
|
|
text = self.lines[lineno][begin:end].tostring()
|
|
if extra.search(text) < 0:
|
|
break
|
|
elif ftype == 'match':
|
|
text = self.lines[lineno][begin:end].tostring()
|
|
if extra.match(text) < 0:
|
|
break
|
|
elif ftype == 'cursor':
|
|
if self.x != lineno or not \
|
|
begin <= self.y < end:
|
|
break
|
|
else:
|
|
ok = 1
|
|
if ok:
|
|
self.okay.append(name)
|
|
else:
|
|
self.fail.append(name)
|
|
self.busy.remove(name)
|
|
return ok
|
|
|
|
def extract_field(self, screenname, fieldname):
|
|
ftype, lineno, begin, end, extra = \
|
|
self.screens[screenname][fieldname]
|
|
return stripright(self.lines[lineno][begin:end].tostring())
|
|
|
|
def extract_rect(self, left, top, right, bottom):
|
|
lines = []
|
|
for i in range(top, bottom):
|
|
lines.append(stripright(self.lines[i][left:right])
|
|
.tostring())
|
|
return lines
|
|
|
|
|
|
def stripright(line):
|
|
i = len(line)
|
|
while i > 0 and line[i-1] in string.whitespace: i = i-1
|
|
return line[:i]
|