"""Handles mapping between color names and ANSI codes and determining auto color codes.""" import sys try: from collections import Mapping except ImportError: from collections.abc import Mapping BASE_CODES = { '/all': 0, 'b': 1, 'f': 2, 'i': 3, 'u': 4, 'flash': 5, 'outline': 6, 'negative': 7, 'invis': 8, 'strike': 9, '/b': 22, '/f': 22, '/i': 23, '/u': 24, '/flash': 25, '/outline': 26, '/negative': 27, '/invis': 28, '/strike': 29, '/fg': 39, '/bg': 49, 'black': 30, 'red': 31, 'green': 32, 'yellow': 33, 'blue': 34, 'magenta': 35, 'cyan': 36, 'white': 37, 'bgblack': 40, 'bgred': 41, 'bggreen': 42, 'bgyellow': 43, 'bgblue': 44, 'bgmagenta': 45, 'bgcyan': 46, 'bgwhite': 47, 'hiblack': 90, 'hired': 91, 'higreen': 92, 'hiyellow': 93, 'hiblue': 94, 'himagenta': 95, 'hicyan': 96, 'hiwhite': 97, 'hibgblack': 100, 'hibgred': 101, 'hibggreen': 102, 'hibgyellow': 103, 'hibgblue': 104, 'hibgmagenta': 105, 'hibgcyan': 106, 'hibgwhite': 107, 'autored': None, 'autoblack': None, 'automagenta': None, 'autowhite': None, 'autoblue': None, 'autoyellow': None, 'autogreen': None, 'autocyan': None, 'autobgred': None, 'autobgblack': None, 'autobgmagenta': None, 'autobgwhite': None, 'autobgblue': None, 'autobgyellow': None, 'autobggreen': None, 'autobgcyan': None, '/black': 39, '/red': 39, '/green': 39, '/yellow': 39, '/blue': 39, '/magenta': 39, '/cyan': 39, '/white': 39, '/hiblack': 39, '/hired': 39, '/higreen': 39, '/hiyellow': 39, '/hiblue': 39, '/himagenta': 39, '/hicyan': 39, '/hiwhite': 39, '/bgblack': 49, '/bgred': 49, '/bggreen': 49, '/bgyellow': 49, '/bgblue': 49, '/bgmagenta': 49, '/bgcyan': 49, '/bgwhite': 49, '/hibgblack': 49, '/hibgred': 49, '/hibggreen': 49, '/hibgyellow': 49, '/hibgblue': 49, '/hibgmagenta': 49, '/hibgcyan': 49, '/hibgwhite': 49, '/autored': 39, '/autoblack': 39, '/automagenta': 39, '/autowhite': 39, '/autoblue': 39, '/autoyellow': 39, '/autogreen': 39, '/autocyan': 39, '/autobgred': 49, '/autobgblack': 49, '/autobgmagenta': 49, '/autobgwhite': 49, '/autobgblue': 49, '/autobgyellow': 49, '/autobggreen': 49, '/autobgcyan': 49, } class ANSICodeMapping(Mapping): """Read-only dictionary, resolves closing tags and automatic colors. Iterates only used color tags. :cvar bool DISABLE_COLORS: Disable colors (strip color codes). :cvar bool LIGHT_BACKGROUND: Use low intensity color codes. """ DISABLE_COLORS = False LIGHT_BACKGROUND = False def __init__(self, value_markup): """Constructor. :param str value_markup: String with {color} tags. """ self.whitelist = [k for k in BASE_CODES if '{' + k + '}' in value_markup] def __getitem__(self, item): """Return value for key or None if colors are disabled. :param str item: Key. :return: Color code integer. :rtype: int """ if item not in self.whitelist: raise KeyError(item) if self.DISABLE_COLORS: return None return getattr(self, item, BASE_CODES[item]) def __iter__(self): """Iterate dictionary.""" return iter(self.whitelist) def __len__(self): """Dictionary length.""" return len(self.whitelist) @classmethod def disable_all_colors(cls): """Disable all colors. Strips any color tags or codes.""" cls.DISABLE_COLORS = True @classmethod def enable_all_colors(cls): """Enable all colors. Strips any color tags or codes.""" cls.DISABLE_COLORS = False @classmethod def disable_if_no_tty(cls): """Disable all colors only if there is no TTY available. :return: True if colors are disabled, False if stderr or stdout is a TTY. :rtype: bool """ if sys.stdout.isatty() or sys.stderr.isatty(): return False cls.disable_all_colors() return True @classmethod def set_dark_background(cls): """Choose dark colors for all 'auto'-prefixed codes for readability on light backgrounds.""" cls.LIGHT_BACKGROUND = False @classmethod def set_light_background(cls): """Choose dark colors for all 'auto'-prefixed codes for readability on light backgrounds.""" cls.LIGHT_BACKGROUND = True @property def autoblack(self): """Return automatic black foreground color depending on background color.""" return BASE_CODES['black' if ANSICodeMapping.LIGHT_BACKGROUND else 'hiblack'] @property def autored(self): """Return automatic red foreground color depending on background color.""" return BASE_CODES['red' if ANSICodeMapping.LIGHT_BACKGROUND else 'hired'] @property def autogreen(self): """Return automatic green foreground color depending on background color.""" return BASE_CODES['green' if ANSICodeMapping.LIGHT_BACKGROUND else 'higreen'] @property def autoyellow(self): """Return automatic yellow foreground color depending on background color.""" return BASE_CODES['yellow' if ANSICodeMapping.LIGHT_BACKGROUND else 'hiyellow'] @property def autoblue(self): """Return automatic blue foreground color depending on background color.""" return BASE_CODES['blue' if ANSICodeMapping.LIGHT_BACKGROUND else 'hiblue'] @property def automagenta(self): """Return automatic magenta foreground color depending on background color.""" return BASE_CODES['magenta' if ANSICodeMapping.LIGHT_BACKGROUND else 'himagenta'] @property def autocyan(self): """Return automatic cyan foreground color depending on background color.""" return BASE_CODES['cyan' if ANSICodeMapping.LIGHT_BACKGROUND else 'hicyan'] @property def autowhite(self): """Return automatic white foreground color depending on background color.""" return BASE_CODES['white' if ANSICodeMapping.LIGHT_BACKGROUND else 'hiwhite'] @property def autobgblack(self): """Return automatic black background color depending on background color.""" return BASE_CODES['bgblack' if ANSICodeMapping.LIGHT_BACKGROUND else 'hibgblack'] @property def autobgred(self): """Return automatic red background color depending on background color.""" return BASE_CODES['bgred' if ANSICodeMapping.LIGHT_BACKGROUND else 'hibgred'] @property def autobggreen(self): """Return automatic green background color depending on background color.""" return BASE_CODES['bggreen' if ANSICodeMapping.LIGHT_BACKGROUND else 'hibggreen'] @property def autobgyellow(self): """Return automatic yellow background color depending on background color.""" return BASE_CODES['bgyellow' if ANSICodeMapping.LIGHT_BACKGROUND else 'hibgyellow'] @property def autobgblue(self): """Return automatic blue background color depending on background color.""" return BASE_CODES['bgblue' if ANSICodeMapping.LIGHT_BACKGROUND else 'hibgblue'] @property def autobgmagenta(self): """Return automatic magenta background color depending on background color.""" return BASE_CODES['bgmagenta' if ANSICodeMapping.LIGHT_BACKGROUND else 'hibgmagenta'] @property def autobgcyan(self): """Return automatic cyan background color depending on background color.""" return BASE_CODES['bgcyan' if ANSICodeMapping.LIGHT_BACKGROUND else 'hibgcyan'] @property def autobgwhite(self): """Return automatic white background color depending on background color.""" return BASE_CODES['bgwhite' if ANSICodeMapping.LIGHT_BACKGROUND else 'hibgwhite'] def list_tags(): """List the available tags. :return: List of 4-item tuples: opening tag, closing tag, main ansi value, closing ansi value. :rtype: list """ # Build reverse dictionary. Keys are closing tags, values are [closing ansi, opening tag, opening ansi]. reverse_dict = dict() for tag, ansi in sorted(BASE_CODES.items()): if tag.startswith('/'): reverse_dict[tag] = [ansi, None, None] else: reverse_dict['/' + tag][1:] = [tag, ansi] # Collapse four_item_tuples = [(v[1], k, v[2], v[0]) for k, v in reverse_dict.items()] # Sort. def sorter(four_item): """Sort /all /fg /bg first, then b i u flash, then auto colors, then dark colors, finally light colors. :param iter four_item: [opening tag, closing tag, main ansi value, closing ansi value] :return Sorting weight. :rtype: int """ if not four_item[2]: # /all /fg /bg return four_item[3] - 200 if four_item[2] < 10 or four_item[0].startswith('auto'): # b f i u or auto colors return four_item[2] - 100 return four_item[2] four_item_tuples.sort(key=sorter) return four_item_tuples