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#!/usr/bin/env python3
#******************************************************************************
# Copyright (C) 2019 Thomas "Cakeisalie5" Touhey <thomas@touhey.fr>
# This file is part of the thcolor project, which is MIT-licensed.
#******************************************************************************
""" Named color reference, parent class. """
from inspect import (getfullargspec as _getfullargspec,
getmembers as _getmembers, ismethod as _ismethod)
from itertools import count as _count
from ._sys import netscape_color as _netscape_color
from ._exc import (NotEnoughArgumentsError as _NotEnoughArgumentsError,
TooManyArgumentsError as _TooManyArgumentsError,
InvalidArgumentTypeError as _InvalidArgumentTypeError)
__all__ = ["Reference"]
_default_reference = None
_color_cls = None
def _get_color_class():
global _color_cls
if _color_cls is not None:
return _color_cls
from ._color import Color
_color_cls = Color
return _color_cls
class _type_or:
""" A type or another. """
def __init__(self, type1, type2):
self._type1 = type1
self._type2 = type2
@property
def type1(self):
return self._type1
@property
def type2(self):
return self._type2
def __repr__(self):
return f"{repr(self._type1)} | {repr(self._type2)}"
def __str__(self):
return f"{self._type1} or {self._type2}"
def __or__(self, other):
return type_or(self, other)
def __contains__(self, other):
return other in self._type1 or other in self._type2
# ---
# Main reference definition.
# ---
class Reference:
""" Function reference for color parsing and operations. """
def __init__(self):
pass
# ---
# Base type and function definitions for parsing.
# ---
class base_type(type):
""" The metaclass for all types used below. """
def __new__(mcls, name, bases, attrs):
return super().__new__(mcls, name, bases, attrs)
def __init__(self, name, bases, attrs):
self.__name = name
def __contains__(self, other):
return self if other == self else None
def __or__(self, other):
return _type_or(self, other)
def __repr__(self):
return f"<class {repr(self.__name)}>"
def __str__(self):
return self.__name
class number(metaclass = base_type):
""" The number type. """
def __init__(self, value):
if type(value) == str:
self._strvalue = value
self._value = float(value)
else:
self._value = float(value)
if self._value == int(self._value):
self._strvalue = str(int(self._value))
else:
self._strvalue = str(value)
def to_byte(self):
try:
value = int(self._value)
assert value == self._value
assert 0 <= value < 256
except:
raise ValueError("unsuitable value for byte conversion: " \
f"{repr(self._value)}")
return value
def to_factor(self):
try:
assert 0.0 <= self._value <= 1.0
except:
raise ValueError("expected a value between 0.0 and 1.0, got " \
f"{self._value}")
return self._value
def to_color(self):
r, g, b = _netscape_color(self._strvalue)
Color = _get_color_class()
return Color(Color.Type.RGB, r, g, b, 1.0)
class percentage(metaclass = base_type):
def __init__(self, value):
self._value = value
assert 0 <= value <= 100
def __repr__(self):
return f"{self._value} %"
def to_byte(self):
return int(self._value / 100 * 255)
def to_factor(self):
try:
assert 0 <= self._value <= 100
except:
raise ValueError("expected a value between 0.0 and 1.0, got " \
f"{self._value}")
return self._value / 100
class angle(metaclass = base_type):
def __init__(self, value, unit):
self._value = value % 360.0
self._unit = unit
if not self._unit:
self._unit = 'deg'
assert self._unit in ('deg', 'grad', 'rad', 'turn')
def __repr__(self):
return f"{self._value} {self._unit}"
class color(metaclass = base_type):
def __init__(self, value):
if not isinstance(value, _get_color_class()):
raise ValueError("expected a Color instance")
self._value = value
def __repr__(self):
return repr(self._value)
def to_color(self):
return self._value
# ---
# Function and named color getters.
# ---
def _get_functions(self):
""" The functions getter, for getting a function using its
name. """
class _FunctionGetter:
def __init__(self, ref):
self._fref = ref
def __getitem__(self, name):
fref = self._fref
# Find the method.
if name[0:1] == '_' or name in ('functions', 'named',
'default'):
raise KeyError(repr(name))
members = dict(_getmembers(fref, predicate = _ismethod))
try:
method = members[name]
except (KeyError, AssertionError):
raise KeyError(repr(name))
# Make a function separated from the class, copy the
# annotations and add the type check on each argument.
class _MethodCaller:
def __init__(self, fref, name, func):
self._fref = fref
self._name = name
self._func = func
self.__annotations__ = func.__annotations__
try:
del self.__annotations__['self']
except:
pass
spec = _getfullargspec(func)
def annotate(arg_name):
try:
return spec.annotations[arg_name]
except:
return None
self._args = list(map(annotate, spec.args[1:]))
self._optargs = self._args[-len(spec.defaults):] \
if spec.defaults else []
self._args = self._args[:-len(self._optargs)]
def __call__(self, *args):
if len(args) < len(self._args):
raise _NotEnoughArgumentsError(len(self._args),
self._name)
if len(args) > len(self._args) + len(self._optargs):
raise _TooManyArgumentsError(len(self._args),
self._name)
arg_types = self._args \
+ self._optargs[:len(args) - len(self._args)]
for index, arg, exp in zip(_count(), args, arg_types):
if exp is not None and type(arg) not in exp:
raise _InvalidArgumentTypeError(index,
exp, type(arg), self._name)
return self._func(*args)
return _MethodCaller(self, name, method)
return _FunctionGetter(self)
def _get_colors(self):
""" The colors getter, for getting a named color. """
class _ColorGetter:
def __init__(self, ref):
self._cref = ref
def __getitem__(self, name):
return self._cref._color(name)
return _ColorGetter(self)
functions = property(_get_functions)
colors = property(_get_colors)
# ---
# Default methods.
# ---
def _color(self, name):
""" Get a named color. """
raise KeyError(f'{name}: no such color')
def default():
""" Get the default reference. """
global _default_reference
if _default_reference is not None:
return _default_reference
from ._builtin import CSS4Reference
_default_reference = CSS4Reference()
return _default_reference
# End of file.
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