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Copy pathmain.py
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1117 lines (967 loc) · 36.1 KB
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# -*- mode: python; coding: utf-8; -*-
#
import sys
import os
import re
import traceback
import locale
import signal
import zipfile
from cStringIO import StringIO
import time
import curses
import curses.ascii as ascii
from fb2parser import fb2parse
from paragraph import attr
import options
import const
from options import convert_color, get_keys
default_charset = locale.getdefaultlocale()[1]
class MainWindow:
def __init__(self):
self.back_history = []
self.fore_history = []
self.message = ''
self.message_timeout = 0
signal.signal(signal.SIGALRM, self.alarm_handler)
# alarm as timer for auto scroll
self.c_fifo_scroll_line = 0 # counter for fifo auto scroll
self.filename = None
if options.general['filename']:
self.filename = os.path.abspath(options.general['filename'])
self.par_index = 0
self.line_index = 0
positions = self.load_positions()
if self.filename is None and not positions:
sys.exit('Error: Missing filename')
if self.filename is None:
# load last file
l = positions[0]
self.filename = l[0]
self.par_index = int(l[1])
self.line_index = int(l[2])
else:
for l in positions:
if l[0] == self.filename:
self.par_index = int(l[1])
self.line_index = int(l[2])
break
self.basename = os.path.basename(self.filename)
if options.general['auto_scroll']:
signal.alarm(options.general['auto_scroll_interval'])
signal.signal(signal.SIGWINCH, self.resize_window)
self.screen = curses.initscr()
curses.noecho()
curses.cbreak()
curses.start_color()
if options.general['use_default_colors']:
curses.use_default_colors()
self.init_color()
self.init_screen(self.screen)
#~curses.mousemask(curses.ALL_MOUSE_EVENTS)
self.link_pos = []
# for <a> elements; list of tuples (y, x, link_name)
self.cur_link = 0 # current cursor position; index of link_pos
self.content = create_content(self.filename, curses.COLS)
if options.general['percent']:
if options.general['percent'] < 1 or options.general['percent'] > 100:
sys.exit('Error: Percent of the value must be between 1 and 100')
self.par_index, self.line_index = self.content.get_position(options.general['percent'])
self.screen.nodelay(1)
self.update_status = True
self.redraw_scr()
if options.general['edit_xml']:
self.edit_xml()
def init_screen(self, screen):
screen.keypad(1)
screen.nodelay(1)
screen.scrollok(True)
#screen.idlok(True)
def load_positions(self):
positions = []
try:
d = open(os.path.expanduser(options.paths['save_file'])).read()
except:
pass
else:
l = d.splitlines()
for s in l:
try:
fn, par_index, line_index = s.rsplit(' ', 2)
positions.append((fn, par_index, line_index))
except:
traceback.print_exc(file=sys.stdout)
return positions
def save_position(self):
positions = self.load_positions()
save_pos = [(self.filename, str(self.par_index), str(self.line_index))]
for l in positions:
if l[0] != self.filename:
save_pos.append(l)
save_file = os.path.expanduser(options.paths['save_file'])
# it may so happen that user would specify path with non-existent
# directories in it. In such cases open() would fail. To prevent that,
# we create all the directories.
dirs = os.path.dirname(save_file)
if not os.path.exists(dirs):
os.makedirs(os.path.dirname(save_file))
fd = open(save_file, 'w')
for l in save_pos:
print >> fd, ' '.join(l)
def init_color(self):
n = 1
for i in options.styles:
fg = convert_color(options.styles[i]['foreground'])
bg = convert_color(options.styles[i]['background'])
if fg is None and bg is None:
options.styles[i]['color'] = None
continue
if fg is None:
fg = convert_color(options.styles['default']['foreground'])
if bg is None:
bg = convert_color(options.styles['default']['background'])
# If config file misses a definition for the 'background'
# or 'foreground', consider using default environment
# colors. Curses allows passing -1 constant which means
# default value.
# FIXME: One might put -1 into `const.py' and name it.
fg = -1 if fg is None else fg
bg = -1 if bg is None else bg
curses.init_pair(n, fg, bg)
options.styles[i]['color'] = n
n += 1
if not options.general['use_default_colors']:
n = options.styles['default']['color']
self.screen.bkgdset(ord(' '), curses.color_pair(n))
def add_str(self, line, type):
# add string to current cursor position
if type in options.styles:
opt = options.styles[type]
else:
opt = options.styles['default']
cur_attr = None
in_search = False
for s in line:
if isinstance(s, int):
# attribute
if s == attr.strong:
cur_attr = options.styles['strong']['color']
elif s == attr.emphasis:
cur_attr = options.styles['emphasis']['color']
elif s == attr.style:
cur_attr = options.styles['style']['color']
elif s == attr.left_spaces:
# leading spaces
cur_attr = s # options.styles['default']['color']
elif s == attr.search:
in_search = True
pass
elif s == attr.cancel_search:
in_search = False
else:
cur_attr = None
continue
elif isinstance(s, tuple):
# link
cur_attr = options.styles['a']['color']
yx = list(self.screen.getyx())
yx.append(s[1]) # add link name (href)
self.link_pos.append(yx)
continue
# string
s = s.encode(default_charset, 'replace')
if in_search:
a = curses.A_REVERSE
else:
a = curses.A_NORMAL
if ('bold' in opt) and (opt['bold'] == True):
a |= curses.A_BOLD
if cur_attr == attr.left_spaces:
self.screen.addstr(s, a)
elif cur_attr is not None:
# strong, emphasis, etc...
color = curses.color_pair(cur_attr)
self.screen.addstr(s, color | a)
else:
if opt['color'] is not None:
color = curses.color_pair(opt['color'])
self.screen.addstr(s, color | a)
else:
self.screen.addstr(s, a)
def redraw_scr(self):
# redraw screen
self.link_pos = [] # remove links
self.cur_link = 0
self.screen.clear()
_par_index, _line_index = self.par_index, self.line_index
i = 0
while True:
try:
s, type = self.content.get(_par_index, _line_index)
except IndexError:
break
self.add_str(s, type)
_par_index, _line_index = self.content.indexes()
i += 1
if i > curses.LINES - options.general['status'] - 1:
break
self.screen.move(i, 0)
_line_index += 1
def toggle_status(self, status):
""" toggle status
"""
#options.general['status'] = not options.status
self.update_status = True
if not status:
self.screen.move(curses.LINES - 1, 0)
self.screen.clrtoeol()
n = curses.LINES - 1
try:
s, type = self.content.get(
self.par_index,
self.line_index + n - self.c_fifo_scroll_line
)
except IndexError:
# EOF
pass
else:
self.add_str(s, type)
if status:
self.update_links_pos()
def update_links_pos(self, d=0):
# Note: this function calling before scrolling
if not self.link_pos:
return
lines = curses.LINES - options.general['status']
links = []
i = 0
for link in self.link_pos:
link[0] -= d
if 0 <= link[0] < lines:
links.append(link)
else:
# link removed
i += 1
if i == 0:
# no changes
return
# re-sort links
if links:
link = self.link_pos[self.cur_link]
links.sort()
if link in links:
self.cur_link = links.index(link)
else:
if d == 1:
# first link (scroll down)
self.cur_link = 0
else:
# last link (scroll up)
self.cur_link = len(links) - 1
else:
self.cur_link = 0
self.link_pos = links
def get_utf8_string (self):
# This method replaces curses getstr in case of utf8
# encoding. The problem with original getstr is that
# it treats multi-byte utf8 character as {2-6} bytes,
# which leads to the wrong behaviour when handling
# backspace key. Backspace key deletes exactly one
# byte, so user has to press the key 2-6 times.
#
# In this method we analyze if a character starts
# a multi-byte, and read the correct number of bytes
# for the symbol. We adjust backspace to delete the
# last utf8 character we read. We reject any ascii
# service symbol like ESC, F1, etc, by applying
# ascii.isprint.
# FIXME: Is it a valid check for utf-8 encoding?
assert default_charset == 'UTF-8'
ss = []
while True:
c = self.screen.getch ()
# xterm passes backspace hit as curses.KEY_BACKSPACE,
# other terminals pass it as ascii.BS or ascii.DEL.
# So here we unify backspace to ascii.BS and
# Skip any other service symbol, like F1, KEY_UP, etc
if c == curses.KEY_BACKSPACE:
c = ascii.BS
elif c > 0xff:
continue
# In utf8 every multi-byte symbol starts with a byte
# that encodes the number of symbols. Here is a table:
# Bytes Max value First byte (binary)
# 1 0x7f 0xxxxxxx
# 2 0x7ff 110xxxxx
# 3 0xffff 1110xxxx
# 4 0x1fffff 11110xxx
# 5 0x3ffffff 111110xx
# 6 0x7fffffff 1111110x
#
# So in essence, the first position of '0' bit if
# counting from the left hand side is a number of
# bytes in a utf8 multi-char.
byte_count = 0
for i in xrange (8):
if not bool (c & (1 << (7 - i))):
byte_count = i;
break;
# Now when we know a number of bytes, we have to call
# getch() byte_count - 1 times, in order to read the
# whole character.
if byte_count > 6 or byte_count == 1:
raise Exception ("invalid utf8 leading character")
c = [c]
if byte_count >= 2:
for i in xrange (byte_count - 1):
c.append (self.screen.getch ())
# Create a string from the list of bytes.
cc = "".join ([chr (x) for x in c])
# String is done, if user hit ENTER.
if cc == chr (ascii.NL):
break
# In case of backspace, delete the last character
# or continue if input is empty.
if cc in (chr (ascii.DEL), chr (ascii.BS)):
if len (ss) == 0:
continue
ss.pop ()
y, x = curses.getsyx ()
self.screen.move (y, x - 1)
self.screen.delch ()
continue
# Do not save character, if it is something
# non-printable, like ESC or similar.
if len (cc) == 1 and not ascii.isprint (ord (cc)):
continue
# Append symbol to the list of symbols and put
# it on the screen.
ss.append (cc)
self.screen.addstr (cc)
# Combine characters from list `ss' into a string
return "".join (ss)
def search(self):
search_msg = 'Search pattern: '
self.update_status = True
self.screen.move(curses.LINES - 1, 0)
self.screen.clrtoeol()
self.screen.addstr(search_msg)
self.screen.nodelay(0)
if default_charset == 'UTF-8':
s = self.get_utf8_string()
else:
curses.echo()
s = self.screen.getstr()
curses.noecho()
# Ignore the errors happening when deleting the
# multi-byte characters.
s = unicode(s, default_charset, errors='ignore')
self.screen.nodelay(1)
if not s:
return
found = self.content.search(s, self.par_index, self.line_index)
if found in (0, -1):
self.redraw_scr()
if found == 0:
self.message = 'Pattern not found '
else:
self.message = 'Invalid pattern '
return
self.par_index, self.line_index = found
self.redraw_scr()
def search_next(self):
if not self.content.search_string:
self.message = 'No previous regular expression'
return
self.update_status = True
found = self.content.search(self.content.search_string,
self.par_index, self.line_index + 1)
if not found:
self.redraw_scr()
self.message = 'ERROR: Pattern not found '
return
self.par_index, self.line_index = found
self.redraw_scr()
def goto_percent(self):
self.screen.move(curses.LINES - 1, 0)
self.screen.clrtoeol()
self.screen.addstr('Go(%): ')
self.screen.nodelay(0)
if default_charset == 'UTF-8':
s = self.get_utf8_string()
else:
curses.echo()
s = self.screen.getstr()
curses.noecho()
# Ignore the errors happening when deleting the
# multi-byte characters.
s = unicode(s, default_charset, errors='ignore')
s = s.encode(default_charset)
self.update_status = True
try:
pos = float(s)
except:
self.redraw_scr()
return
if pos < 0 or pos > 100:
self.redraw_scr()
return
if 1: # pos:
self.par_index, self.line_index = self.content.get_position(pos)
self.redraw_scr()
self.screen.nodelay(1)
def goto_link(self):
if self.link_pos:
id = self.link_pos[self.cur_link][2]
if id.startswith('#'):
id = id[1:]
else:
print 'external link:', id
return
i = self.content.get_by_id(id)
if i is None:
self.message = 'Link not found '
else:
self.back_history.append((self.par_index, self.line_index))
self.fore_history = []
self.update_status = True
self.par_index = i
self.line_index = 0
self.redraw_scr()
def goto_backward(self):
if self.back_history:
self.update_status = True
pos = self.back_history.pop()
self.fore_history.append((self.par_index,
self.line_index))
self.par_index, self.line_index = pos
self.redraw_scr()
def goto_forward(self):
if self.fore_history:
self.update_status = True
pos = self.fore_history.pop()
self.back_history.append((self.par_index,
self.line_index))
self.par_index, self.line_index = pos
self.redraw_scr()
def jump_link(self):
if not self.link_pos:
return
self.cur_link = (self.cur_link + 1) % len(self.link_pos)
pos = self.link_pos[self.cur_link]
self.screen.move(*pos[:2])
def scroll_up(self):
# set scroll type for auto scroll
options.general['auto_scroll_type'] = const.SCROLL_UP
# redraw after auto scroll
if self.c_fifo_scroll_line > 0:
self.line_index -= self.c_fifo_scroll_line
self.redraw_scr()
self.c_fifo_scroll_line = 0
if self.par_index == 0 and self.line_index == 0:
return
self.update_status = True
self.screen.scroll(-1)
# clear last string if it posible
# (for ex. when options.lines < curses.LINES)
try:
self.screen.move(curses.LINES, 0)
self.screen.clrtoeol()
except:
pass
self.line_index -= 1
self.update_links_pos(-1)
s, type = self.content.get(self.par_index, self.line_index)
self.screen.move(0, 0)
self.add_str(s, type)
self.par_index, self.line_index = self.content.indexes()
def scroll_down(self):
# set scroll type for auto scroll
options.general['auto_scroll_type'] = const.SCROLL_DOWN
# redraw after auto scroll
if self.c_fifo_scroll_line > 0:
self.line_index -= self.c_fifo_scroll_line
self.redraw_scr()
self.c_fifo_scroll_line = 0
n = curses.LINES - options.general['status']
try:
s, type = self.content.get(self.par_index, self.line_index + n)
except IndexError:
# EOF
return
self.toggle_status(options.general['status'])
self.update_links_pos(1)
self.screen.scroll(1)
self.screen.move(curses.LINES - 1 - options.general['status'], 0)
self.screen.clrtoeol()
self.add_str(s, type)
self.line_index += 1
self.par_index, self.line_index = self.content.indexes(
self.par_index, self.line_index)
def alarm_handler(self, signum, frame):
"""Execute functions by alarm as timer"""
# get scroll_type and exec it function
if options.general['auto_scroll_type']:
func = getattr(self, options.general['auto_scroll_type'])
func()
signal.alarm(options.general['auto_scroll_interval'])
def scroll_fifo(self):
""" FIFO type auto scroll
Autoscroll by replacing already readed lines"""
# set scroll type for auto scroll
options.general['auto_scroll_type'] = const.SCROLL_FIFO
n = curses.LINES - options.general['status']
try:
s, type = self.content.get(self.par_index, self.line_index + n)
except IndexError:
# EOF
return
self.update_status = True
self.update_links_pos(1)
# rotate fifo
if self.c_fifo_scroll_line >= n:
# go back to top of screen
self.c_fifo_scroll_line = 0
# erase previous pointer (*)
if self.c_fifo_scroll_line > 0:
self.screen.move(self.c_fifo_scroll_line - 1, 0)
self.screen.addch(" ")
else:
self.screen.move(n - 1, 0)
self.screen.addch(" ")
# draw current string
self.screen.move(self.c_fifo_scroll_line, 0)
self.screen.clrtoeol()
self.add_str(s, type)
# draw pointer to current string
self.screen.move(self.c_fifo_scroll_line, 0)
self.screen.addch("*")
# erase next line
if self.c_fifo_scroll_line + 1 < curses.LINES - options.general['status']:
self.screen.move(self.c_fifo_scroll_line + 1, 0)
self.screen.clrtoeol()
self.c_fifo_scroll_line += 1
self.line_index += 1
self.par_index, self.line_index = self.content.indexes(
self.par_index, self.line_index)
def next_page(self):
# set scroll type for auto scroll
options.general['auto_scroll_type'] = const.NEXT_PAGE
n = (
curses.LINES
- options.general['context_lines']
- options.general['status']
)
try:
s, type = self.content.get(self.par_index, self.line_index + n)
except IndexError:
# EOF
return
self.update_status = True
self.line_index += n
self.redraw_scr()
self.par_index, self.line_index = self.content.indexes(
self.par_index,
self.line_index,
)
def prev_page(self):
# set scroll type for auto scroll
options.general['auto_scroll_type'] = const.PREV_PAGE
if self.par_index == 0 and self.line_index == 0:
return
self.update_status = True
n = (
curses.LINES
- options.general['context_lines']
- options.general['status']
)
self.line_index -= n
self.redraw_scr()
self.par_index, self.line_index = self.content.indexes(
self.par_index,
self.line_index
)
def goto_home(self):
if self.par_index == 0 and self.line_index == 0:
return
self.update_status = True
self.par_index = self.line_index = 0
self.redraw_scr()
def goto_end(self):
self.update_status = True
self.par_index, self.line_index = \
self.content.get_end_indexes(curses.LINES)
self.redraw_scr()
def resize_window(self, *args):
#self.screen.refresh()
curses.endwin()
self.screen = curses.initscr()
self.update_status = True
curses.LINES, curses.COLS = self.screen.getmaxyx()
self.content.update(curses.COLS)
self.redraw_scr()
#print >> file('log', 'a'), self.screen.getmaxyx()
#print >> file('log', 'a'), curses.LINES, curses.COLS
#print >> file('log', 'a'), '>>', self.screen.getbegyx()
def draw_status(self, _time):
self.screen.move(curses.LINES - 1, 0)
self.screen.clrtoeol()
status = ''
end_line = self.line_index + curses.LINES - 1
status += ' %d%%' % self.content.position(
self.par_index, end_line)
## if 1: # debug
## status += ' (%d/%d/%d)' % (self.par_index,
## self.line_index,
## len(self.content._content))
status += _time
n = curses.COLS - 2 - len(status)
status = self.basename[:n - 1] + status
if options.general['auto_scroll']:
status += "*"
self.screen.addstr(status, curses.A_REVERSE)
def draw_message(self, message):
self.screen.move(curses.LINES - 1, 0)
self.screen.clrtoeol()
self.screen.addstr(message, curses.A_REVERSE)
def edit_xml(self):
par = self.content._content[self.par_index]
byte_index = par.byte_index
curses.def_prog_mode() # save current tty modes
curses.endwin()
os.system(
options.general['editor'].format(
byte_offset=byte_index,
filename=self.filename
)
)
self.screen = curses.initscr()
def main_loop(self):
cur_time = ''
_time = ''
while True: # main loop
ch = self.screen.getch()
#ch = curses.wgetch()
if ch in get_keys('quit'):
break
elif ch in get_keys('toggle-status'):
options.general['status'] = not options.general['status']
self.toggle_status(options.general['status'])
elif ch in get_keys('goto-percent'):
self.goto_percent()
elif ch in get_keys('search'):
self.search()
elif ch in get_keys('search-next'):
self.search_next()
elif ch in get_keys('jump-link'):
self.jump_link()
elif ch in get_keys('goto-link'):
self.goto_link()
elif ch in get_keys('backward'):
self.goto_backward()
elif ch in get_keys('forward'):
self.goto_forward()
elif ch in get_keys('scroll-up'):
self.scroll_up()
elif ch in get_keys('scroll-down'):
self.scroll_down()
elif ch in get_keys('scroll-fifo'):
self.scroll_fifo()
elif ch in get_keys('auto-scroll'):
# start / stop
options.general['auto_scroll'] = not options.general['auto_scroll']
# switch auto scroll mode
if options.general['auto_scroll']:
self.message = (
"Auto scroll On :"
+ str(options.general['auto_scroll_type'])
+ " at "
+ str(options.general['auto_scroll_interval'])
+ "sec"
)
signal.alarm(options.general['auto_scroll_interval'])
# start alarm timer
if not options.general['auto_scroll_type']:
self.message = (
"Please! Select auto scroll type "
"(f, Down, PgDown, Up, PgUp)"
)
else:
self.message = "Auto scroll Off"
signal.alarm(0) # turn off timer
self.update_status = True
elif ch in get_keys('timer-inc'):
options.general['auto_scroll_interval'] += 1
self.message = (
"Interval: "
+ str(options.general['auto_scroll_interval'])
+ "sec"
)
self.update_status = True
elif ch in get_keys('timer-dec'):
options.general['auto_scroll_interval'] -= 1
if options.general['auto_scroll_interval'] < 1:
options.general['auto_scroll_interval'] = 1
self.message = (
"Interval: "
+ str(options.general['auto_scroll_interval'])
+ "sec"
)
self.update_status = True
elif ch in get_keys('next-page'):
self.next_page()
elif ch in get_keys('prev-page'):
self.prev_page()
elif ch in get_keys('goto-home'):
self.goto_home()
elif ch in get_keys('goto-end'):
self.goto_end()
elif ch in get_keys('edit-xml'):
self.edit_xml()
## elif ch in (curses.KEY_MOUSE,):
## print 'mouse:', curses.getmouse()
#elif hasattr(curses, 'KEY_RESIZE') and ch in (curses.KEY_RESIZE,):
## elif ch in (curses.KEY_RESIZE,):
## print >> file('log', 'w'), 'KEY_RESIZE'
## self.resize_window()
## elif ch != -1:
## print 'ch:', ch
if self.message:
self.message_timeout = 5000 # milliseconds
self.draw_message(self.message)
self.toggle_status(True) # in case if links has been removed
self.message = ''
elif options.general['status']:
_time = time.strftime(' %H:%M ')
if _time != cur_time:
self.update_status = True
if self.message_timeout:
self.message_timeout -= 10
if self.message_timeout <= 0:
self.message_timeout = 0
self.update_status = True
self.toggle_status(options.general['status']) # restore status
if self.update_status and self.message_timeout <= 0:
if options.general['status']:
self.draw_status(_time)
if self.link_pos:
# move cursor to current link
pos = self.link_pos[self.cur_link]
self.screen.move(*pos[:2])
elif not options.general['status']:
# move cursor to bottom-right corner
self.screen.move(curses.LINES - 1, curses.COLS - 1)
self.update_status = False
cur_time = _time
curses.napms(10)
# end of loop
self.save_position()
class Content:
def __init__(self, content, scr_cols):
self._content = content
self._content_len = 0
for par in content:
self._content_len += len(par.data)
self._par_index = self._line_index = 0
self.scr_cols = scr_cols
self.links = {}
self.search_string = ''
def get(self, par_index, line_index):
if par_index < 0:
par_index = 0
line_index = 0
if line_index < 0 and par_index == 0:
line_index = 0
## if par_index >= len(self._content):
## raise IndexError
if line_index < 0:
par_index -= 1
par = self._content[par_index]
self._split_par(par)
line_index += len(par.lines)
return self.get(par_index, line_index)
par = self._content[par_index]
self._split_par(par)
try:
line = par.lines[line_index]
except IndexError:
par_index += 1
line_index -= len(par.lines)
return self.get(par_index, line_index)
self._par_index, self._line_index = par_index, line_index
return line, par.type
def set_search_offsets(self, par):
s = self.search_string
if not s:
par.search_offsets = []
return
offsets = []
regex = re.compile(s, re.IGNORECASE | re.UNICODE)
m = regex.search(par.data)
while m:
offsets.append((m.start(), m.end()))
m = regex.search(s, m.end())
par.search_offsets = offsets
def indexes(self, par_index=None, line_index=None):
if par_index is None and line_index is None:
return self._par_index, self._line_index
self.get(par_index, line_index)
return self._par_index, self._line_index
def get_by_id(self, id):
if not self.links:
# create links dictionary
i = 0
for par in self._content:
if par.id and par.id not in self.links:
self.links[par.id] = i
i += 1
return self.links.get(id)
def get_end_indexes(self, scr_lines):
i = scr_lines
par_index = len(self._content)
for par in self._content[::-1]:
self._split_par(par)
i -= len(par.lines)
par_index -= 1
if i <= 0:
break
line_index = -i + 1
return par_index, line_index
def position(self, par_index, line_index):
# FIXME
try:
par_index, line_index = self.indexes(par_index, line_index)
except IndexError:
# EOF
par_index = len(self._content)
line_index = 0
n = 0
for par in self._content[:par_index]:
n += len(par.data)
## for par in self._content[:par_index-1]:
## n += len(par.data)
## for line in self._content[par_index].lines[:line_index]:
## n += len(line)
pos = float(n) / self._content_len
if pos > 1:
pos = 1
pos = int(pos * 100)
return pos
def get_position(self, percent):
# FIXME
percent = float(percent) / 100
total = self._content_len
n = 0
i = 0
for par in self._content:
n += len(par.data)
if float(n) / total > percent:
t = (
curses.LINES
- options.general['context_lines']