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""" Utilities for processing ANSI escape codes and special ASCII characters.
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"""
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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# Standard library imports
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from collections import namedtuple
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import re
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# System library imports
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from IPython.external.qt import QtCore, QtGui
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#-----------------------------------------------------------------------------
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# Constants and datatypes
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#-----------------------------------------------------------------------------
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# An action for erase requests (ED and EL commands).
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EraseAction = namedtuple('EraseAction', ['action', 'area', 'erase_to'])
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# An action for cursor move requests (CUU, CUD, CUF, CUB, CNL, CPL, CHA, CUP,
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# and HVP commands).
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# FIXME: Not implemented in AnsiCodeProcessor.
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MoveAction = namedtuple('MoveAction', ['action', 'dir', 'unit', 'count'])
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# An action for scroll requests (SU and ST) and form feeds.
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ScrollAction = namedtuple('ScrollAction', ['action', 'dir', 'unit', 'count'])
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# Regular expressions.
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CSI_COMMANDS = 'ABCDEFGHJKSTfmnsu'
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CSI_SUBPATTERN = '\[(.*?)([%s])' % CSI_COMMANDS
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OSC_SUBPATTERN = '\](.*?)[\x07\x1b]'
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ANSI_PATTERN = re.compile('\x01?\x1b(%s|%s)\x02?' % \
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(CSI_SUBPATTERN, OSC_SUBPATTERN))
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SPECIAL_PATTERN = re.compile('([\f])')
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class AnsiCodeProcessor(object):
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""" Translates special ASCII characters and ANSI escape codes into readable
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attributes. It also supports a few non-standard, xterm-specific codes.
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"""
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# Whether to increase intensity or set boldness for SGR code 1.
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# (Different terminals handle this in different ways.)
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bold_text_enabled = False
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# We provide an empty default color map because subclasses will likely want
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# to use a custom color format.
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default_color_map = {}
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#---------------------------------------------------------------------------
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# AnsiCodeProcessor interface
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#---------------------------------------------------------------------------
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def __init__(self):
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self.actions = []
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self.color_map = self.default_color_map.copy()
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self.reset_sgr()
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def reset_sgr(self):
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""" Reset graphics attributs to their default values.
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"""
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self.intensity = 0
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self.italic = False
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self.bold = False
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self.underline = False
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self.foreground_color = None
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self.background_color = None
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def split_string(self, string):
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""" Yields substrings for which the same escape code applies.
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"""
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self.actions = []
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start = 0
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for match in ANSI_PATTERN.finditer(string):
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raw = string[start:match.start()]
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substring = SPECIAL_PATTERN.sub(self._replace_special, raw)
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if substring or self.actions:
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yield substring
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start = match.end()
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self.actions = []
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groups = filter(lambda x: x is not None, match.groups())
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params = [ param for param in groups[1].split(';') if param ]
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if groups[0].startswith('['):
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# Case 1: CSI code.
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try:
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params = map(int, params)
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except ValueError:
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# Silently discard badly formed codes.
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pass
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else:
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self.set_csi_code(groups[2], params)
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elif groups[0].startswith(']'):
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# Case 2: OSC code.
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self.set_osc_code(params)
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raw = string[start:]
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substring = SPECIAL_PATTERN.sub(self._replace_special, raw)
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if substring or self.actions:
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yield substring
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def set_csi_code(self, command, params=[]):
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""" Set attributes based on CSI (Control Sequence Introducer) code.
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Parameters
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----------
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command : str
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The code identifier, i.e. the final character in the sequence.
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params : sequence of integers, optional
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The parameter codes for the command.
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"""
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if command == 'm': # SGR - Select Graphic Rendition
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if params:
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self.set_sgr_code(params)
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else:
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self.set_sgr_code([0])
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elif (command == 'J' or # ED - Erase Data
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command == 'K'): # EL - Erase in Line
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code = params[0] if params else 0
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if 0 <= code <= 2:
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area = 'screen' if command == 'J' else 'line'
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if code == 0:
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erase_to = 'end'
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elif code == 1:
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erase_to = 'start'
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elif code == 2:
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erase_to = 'all'
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self.actions.append(EraseAction('erase', area, erase_to))
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elif (command == 'S' or # SU - Scroll Up
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command == 'T'): # SD - Scroll Down
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dir = 'up' if command == 'S' else 'down'
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count = params[0] if params else 1
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self.actions.append(ScrollAction('scroll', dir, 'line', count))
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def set_osc_code(self, params):
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""" Set attributes based on OSC (Operating System Command) parameters.
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Parameters
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----------
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params : sequence of str
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The parameters for the command.
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"""
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try:
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command = int(params.pop(0))
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except (IndexError, ValueError):
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return
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if command == 4:
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# xterm-specific: set color number to color spec.
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try:
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color = int(params.pop(0))
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spec = params.pop(0)
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self.color_map[color] = self._parse_xterm_color_spec(spec)
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except (IndexError, ValueError):
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pass
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def set_sgr_code(self, params):
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""" Set attributes based on SGR (Select Graphic Rendition) codes.
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Parameters
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----------
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params : sequence of ints
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A list of SGR codes for one or more SGR commands. Usually this
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sequence will have one element per command, although certain
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xterm-specific commands requires multiple elements.
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"""
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# Always consume the first parameter.
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if not params:
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return
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code = params.pop(0)
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if code == 0:
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self.reset_sgr()
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elif code == 1:
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if self.bold_text_enabled:
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self.bold = True
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else:
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self.intensity = 1
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elif code == 2:
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self.intensity = 0
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elif code == 3:
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self.italic = True
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elif code == 4:
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self.underline = True
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elif code == 22:
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self.intensity = 0
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self.bold = False
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elif code == 23:
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self.italic = False
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elif code == 24:
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self.underline = False
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elif code >= 30 and code <= 37:
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self.foreground_color = code - 30
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elif code == 38 and params and params.pop(0) == 5:
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# xterm-specific: 256 color support.
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if params:
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self.foreground_color = params.pop(0)
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elif code == 39:
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self.foreground_color = None
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elif code >= 40 and code <= 47:
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self.background_color = code - 40
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elif code == 48 and params and params.pop(0) == 5:
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# xterm-specific: 256 color support.
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if params:
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self.background_color = params.pop(0)
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elif code == 49:
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self.background_color = None
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# Recurse with unconsumed parameters.
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self.set_sgr_code(params)
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#---------------------------------------------------------------------------
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# Protected interface
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#---------------------------------------------------------------------------
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def _parse_xterm_color_spec(self, spec):
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if spec.startswith('rgb:'):
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return tuple(map(lambda x: int(x, 16), spec[4:].split('/')))
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elif spec.startswith('rgbi:'):
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return tuple(map(lambda x: int(float(x) * 255),
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spec[5:].split('/')))
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elif spec == '?':
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raise ValueError('Unsupported xterm color spec')
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return spec
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def _replace_special(self, match):
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special = match.group(1)
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if special == '\f':
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self.actions.append(ScrollAction('scroll', 'down', 'page', 1))
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return ''
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class QtAnsiCodeProcessor(AnsiCodeProcessor):
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""" Translates ANSI escape codes into QTextCharFormats.
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"""
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# A map from ANSI color codes to SVG color names or RGB(A) tuples.
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darkbg_color_map = {
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0 : 'black', # black
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1 : 'darkred', # red
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2 : 'darkgreen', # green
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3 : 'brown', # yellow
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4 : 'darkblue', # blue
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5 : 'darkviolet', # magenta
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6 : 'steelblue', # cyan
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7 : 'grey', # white
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8 : 'grey', # black (bright)
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9 : 'red', # red (bright)
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10 : 'lime', # green (bright)
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11 : 'yellow', # yellow (bright)
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12 : 'deepskyblue', # blue (bright)
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13 : 'magenta', # magenta (bright)
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14 : 'cyan', # cyan (bright)
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15 : 'white' } # white (bright)
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# Set the default color map for super class.
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default_color_map = darkbg_color_map.copy()
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def get_color(self, color, intensity=0):
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""" Returns a QColor for a given color code, or None if one cannot be
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constructed.
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"""
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if color is None:
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return None
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# Adjust for intensity, if possible.
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if color < 8 and intensity > 0:
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color += 8
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constructor = self.color_map.get(color, None)
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if isinstance(constructor, basestring):
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# If this is an X11 color name, we just hope there is a close SVG
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# color name. We could use QColor's static method
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# 'setAllowX11ColorNames()', but this is global and only available
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# on X11. It seems cleaner to aim for uniformity of behavior.
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return QtGui.QColor(constructor)
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elif isinstance(constructor, (tuple, list)):
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return QtGui.QColor(*constructor)
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return None
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def get_format(self):
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""" Returns a QTextCharFormat that encodes the current style attributes.
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"""
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format = QtGui.QTextCharFormat()
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# Set foreground color
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qcolor = self.get_color(self.foreground_color, self.intensity)
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if qcolor is not None:
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format.setForeground(qcolor)
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# Set background color
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qcolor = self.get_color(self.background_color, self.intensity)
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if qcolor is not None:
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format.setBackground(qcolor)
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# Set font weight/style options
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if self.bold:
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format.setFontWeight(QtGui.QFont.Bold)
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else:
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format.setFontWeight(QtGui.QFont.Normal)
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format.setFontItalic(self.italic)
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format.setFontUnderline(self.underline)
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return format
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def set_background_color(self, color):
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""" Given a background color (a QColor), attempt to set a color map
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that will be aesthetically pleasing.
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"""
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# Set a new default color map.
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self.default_color_map = self.darkbg_color_map.copy()
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if color.value() >= 127:
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# Colors appropriate for a terminal with a light background. For
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# now, only use non-bright colors...
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for i in xrange(8):
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self.default_color_map[i + 8] = self.default_color_map[i]
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# ...and replace white with black.
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self.default_color_map[7] = self.default_color_map[15] = 'black'
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# Update the current color map with the new defaults.
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self.color_map.update(self.default_color_map)
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