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# coding=utf-8
"""Support for ANSI escape codes which are used for things like applying style to text"""
import re
from typing import Any
import colorama
from colorama import Fore, Back, Style
from wcwidth import wcswidth
# Regular expression to match ANSI escape codes
ANSI_ESCAPE_RE = re.compile(r'\x1b[^m]*m')
# Foreground color presets
FG_COLORS = {
'black': Fore.BLACK,
'red': Fore.RED,
'green': Fore.GREEN,
'yellow': Fore.YELLOW,
'blue': Fore.BLUE,
'magenta': Fore.MAGENTA,
'cyan': Fore.CYAN,
'white': Fore.WHITE,
'gray': Fore.LIGHTBLACK_EX,
'lightred': Fore.LIGHTRED_EX,
'lightblue': Fore.LIGHTBLUE_EX,
'lightgreen': Fore.LIGHTGREEN_EX,
'lightyellow': Fore.LIGHTYELLOW_EX,
'lightmagenta': Fore.LIGHTMAGENTA_EX,
'lightcyan': Fore.LIGHTCYAN_EX,
'lightwhite': Fore.LIGHTWHITE_EX,
'reset': Fore.RESET,
}
# Background color presets
BG_COLORS = {
'black': Back.BLACK,
'red': Back.RED,
'green': Back.GREEN,
'yellow': Back.YELLOW,
'blue': Back.BLUE,
'magenta': Back.MAGENTA,
'cyan': Back.CYAN,
'white': Back.WHITE,
'gray': Back.LIGHTBLACK_EX,
'lightred': Back.LIGHTRED_EX,
'lightblue': Back.LIGHTBLUE_EX,
'lightgreen': Back.LIGHTGREEN_EX,
'lightyellow': Back.LIGHTYELLOW_EX,
'lightmagenta': Back.LIGHTMAGENTA_EX,
'lightcyan': Back.LIGHTCYAN_EX,
'lightwhite': Back.LIGHTWHITE_EX,
'reset': Back.RESET,
}
def strip_ansi(text: str) -> str:
"""Strip ANSI escape codes from a string.
:param text: string which may contain ANSI escape codes
:return: the same string with any ANSI escape codes removed
"""
return ANSI_ESCAPE_RE.sub('', text)
def ansi_safe_wcswidth(text: str) -> int:
"""
Wraps wcswidth to make it compatible with colored strings
:param text: the string being measured
"""
# Strip ANSI escape codes since they cause wcswidth to return -1
return wcswidth(strip_ansi(text))
class TextStyle:
"""Style settings for text"""
def __init__(self, *, fg: str = '', bg: str = '', bold: bool = False, underline: bool = False):
"""
Initializer
:param fg: foreground color. Expects color names in FG_COLORS (e.g. 'lightred'). Defaults to blank.
:param bg: background color. Expects color names in BG_COLORS (e.g. 'black'). Defaults to blank.
:param bold: apply the bold style if True. Defaults to False.
:param underline: apply the underline style if True. Defaults to False.
"""
self.fg = fg
self.bg = bg
self.bold = bold
self.underline = underline
# Default styles. These can be altered to suit an application's needs.
SuccessStyle = TextStyle(fg='green')
WarningStyle = TextStyle(fg='lightyellow')
ErrorStyle = TextStyle(fg='lightred')
def style(text: Any, text_style: TextStyle) -> str:
"""
Applies a style to text
:param text: Any object compatible with str.format()
:param text_style: the style to be applied
"""
values = []
text = "{}".format(text)
# Add styles
if text_style.fg:
try:
values.append(FG_COLORS[text_style.fg.lower()])
except KeyError:
raise ValueError('Color {} does not exist.'.format(text_style.fg))
if text_style.bg:
try:
values.append(BG_COLORS[text_style.bg.lower()])
except KeyError:
raise ValueError('Color {} does not exist.'.format(text_style.bg))
if text_style.bold:
values.append(Style.BRIGHT)
if text_style.underline:
underline_enable = colorama.ansi.code_to_chars(4)
values.append(underline_enable)
values.append(text)
# Remove styles
if text_style.fg:
values.append(FG_COLORS['reset'])
if text_style.bg:
values.append(BG_COLORS['reset'])
if text_style.bold:
values.append(Style.NORMAL)
if text_style.underline:
underline_disable = colorama.ansi.code_to_chars(24)
values.append(underline_disable)
return "".join(values)
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