223 lines
7.4 KiB
Python
223 lines
7.4 KiB
Python
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# Copyright (C) 2015 Andrew Hamilton. All rights reserved.
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# Licensed under the Artistic License 2.0.
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import collections
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import weakref
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import terminal
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def cache_first_result(user_function):
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def decorator(self, *args, **kwds):
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try:
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return self._cache
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except AttributeError:
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self._cache = user_function(self, *args, **kwds)
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return self._cache
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return decorator
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class Color:
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black = (0, 0, 0)
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white = (255, 255, 255)
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red = (255, 0, 0)
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green = (0, 255, 0)
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blue = (0, 0, 255)
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yellow = (255, 255, 0)
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grey_50 = (50, 50, 50)
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grey_100 = (100, 100, 100)
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class CharStyle:
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_POOL = weakref.WeakValueDictionary()
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def __new__(cls, fg_color=None, bg_color=None, is_bold=False,
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is_italic=False, is_underlined=False):
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if fg_color is None:
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fg_color = Color.white
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if bg_color is None:
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bg_color = Color.black
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key = (fg_color, bg_color, is_bold, is_italic, is_underlined)
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try:
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return CharStyle._POOL[key]
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except KeyError:
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obj = object.__new__(cls)
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obj.fg_color, obj.bg_color, obj.is_bold, obj.is_italic, \
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obj.is_underlined = key
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return CharStyle._POOL.setdefault(key, obj)
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def __getnewargs__(self):
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return (self.fg_color, self.bg_color, self.is_bold, self.is_italic,
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self.is_underlined)
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def __repr__(self):
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attributes = []
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if self.is_bold:
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attributes.append("b")
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if self.is_italic:
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attributes.append("i")
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if self.is_underlined:
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attributes.append("u")
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return ("<CharStyle: fg:%s bg:%s attr:%s>" %
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(self.fg_color, self.bg_color, ",".join(attributes)))
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@cache_first_result
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def code_for_term(self):
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fg_func = (terminal.fg_color if isinstance(self.fg_color, int)
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else terminal.fg_rgb_color)
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bg_func = (terminal.bg_color if isinstance(self.bg_color, int)
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else terminal.bg_rgb_color)
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bold_code = terminal.bold if self.is_bold else ""
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italic_code = terminal.italic if self.is_italic else ""
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underline_code = terminal.underline if self.is_underlined else ""
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return "".join([terminal.normal, fg_func(self.fg_color),
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bg_func(self.bg_color), bold_code, italic_code,
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underline_code])
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def join_lists(lists):
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result = []
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for list_ in lists:
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result.extend(list_)
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return result
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class TermStr(collections.UserString):
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def __init__(self, data, style=CharStyle()):
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if isinstance(data, self.__class__):
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self.data = data.data
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self.style = data.style
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else:
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self.data = data
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self.style = (style if isinstance(style, tuple)
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else (style,) * len(data))
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def __eq__(self, other):
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return (self is other or
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(isinstance(other, self.__class__) and
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self.data == other.data and self.style == other.style))
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def __ne__(self, other):
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return not self.__eq__(other)
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def __hash__(self):
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return hash((self.data, self.style))
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@cache_first_result
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def _partition_style(self):
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if self.data == "":
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return []
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last_style, last_index = None, 0
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result = []
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for index, style in enumerate(self.style):
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if style != last_style:
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if last_style is not None:
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result.append(
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(last_style, self.data[last_index:index], last_index))
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last_style, last_index = style, index
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result.append(
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(last_style, self.data[last_index:len(self.style)], last_index))
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return result
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def __str__(self):
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return "".join(join_lists(
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[style.code_for_term(), str_]
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for style, str_, position in self._partition_style()) +
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[terminal.normal])
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def __repr__(self):
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return "<TermStr: %r>" % self.data
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def __add__(self, other):
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if isinstance(other, str):
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other = TermStr(other)
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return self.__class__(self.data + other.data, self.style + other.style)
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def __radd__(self, other):
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if isinstance(other, str):
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other = TermStr(other)
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return self.__class__(other.data + self.data, other.style + self.style)
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def __mul__(self, n):
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return self.__class__(self.data*n, self.style*n)
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__rmul__ = __mul__
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def __getitem__(self, index):
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return self.__class__(self.data[index], self.style[index])
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def join(self, parts):
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parts = [TermStr(part) if isinstance(part, str) else part
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for part in parts]
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joined_style = join_lists(self.style + part.style for part in parts)
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return self.__class__(self.data.join(part.data for part in parts),
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tuple(joined_style[len(self.style):]))
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def _split_style(self, parts, sep_length):
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result = []
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cursor = 0
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for part in parts:
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style_part = self.style[cursor:cursor+len(part)]
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result.append(self.__class__(part, style_part))
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cursor += (len(part) + sep_length)
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return result
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def split(self, sep=None, maxsplit=-1):
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return self._split_style(self.data.split(sep, maxsplit), len(sep))
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def splitlines(self, keepends=0):
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# FIX. Fails when a line seperator isn't one character in length.. \r\n
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sep_length = 0 if keepends else len("\n")
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return self._split_style(self.data.splitlines(keepends), sep_length)
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def capitalize(self):
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return self.__class__(self.data.capitalize(), self.style)
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def lower(self):
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return self.__class__(self.data.lower(), self.style)
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def swapcase(self):
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return self.__class__(self.data.swapcase(), self.style)
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def title(self):
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return self.__class__(self.data.title(), self.style)
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def upper(self):
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return self.__class__(self.data.upper(), self.style)
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def ljust(self, width, fillchar=" "):
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return self + self.__class__(fillchar * (width - len(self.data)))
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def rjust(self, width, fillchar=" "):
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return self.__class__(fillchar * (width - len(self.data))) + self
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def center(self, width, fillchar=" "):
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left_width = (width - len(self.data)) // 2
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if left_width < 1:
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return self
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return (self.__class__(fillchar * left_width) + self +
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self.__class__(fillchar *
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(width - left_width - len(self.data))))
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# Below are extra methods useful for termstrs.
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def transform_style(self, transform_func):
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new_style = tuple(join_lists([transform_func(style)] * len(str_)
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for style, str_, position
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in self._partition_style()))
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return self.__class__(self.data, new_style)
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def bold(self):
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def make_bold(style):
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return CharStyle(style.fg_color, style.bg_color, is_bold=True,
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is_underlined=style.is_underlined)
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return self.transform_style(make_bold)
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def underline(self):
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def make_underlined(style):
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return CharStyle(style.fg_color, style.bg_color,
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is_bold=style.is_bold, is_underlined=True)
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return self.transform_style(make_underlined)
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