58 lines
1.4 KiB
Python
58 lines
1.4 KiB
Python
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"""Implementation of :class:`ExpressionRawDomain` class. """
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from sympy.core import Expr, S, sympify, Add
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from sympy.polys.domains.characteristiczero import CharacteristicZero
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from sympy.polys.domains.field import Field
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from sympy.polys.domains.simpledomain import SimpleDomain
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from sympy.polys.polyerrors import CoercionFailed
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from sympy.utilities import public
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@public
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class ExpressionRawDomain(Field, CharacteristicZero, SimpleDomain):
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"""A class for arbitrary expressions but without automatic simplification. """
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is_SymbolicRawDomain = is_EXRAW = True
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dtype = Expr
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zero = S.Zero
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one = S.One
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rep = 'EXRAW'
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has_assoc_Ring = False
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has_assoc_Field = True
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def __init__(self):
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pass
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@classmethod
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def new(self, a):
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return sympify(a)
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def to_sympy(self, a):
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"""Convert ``a`` to a SymPy object. """
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return a
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def from_sympy(self, a):
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"""Convert SymPy's expression to ``dtype``. """
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if not isinstance(a, Expr):
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raise CoercionFailed(f"Expecting an Expr instance but found: {type(a).__name__}")
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return a
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def convert_from(self, a, K):
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"""Convert a domain element from another domain to EXRAW"""
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return K.to_sympy(a)
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def get_field(self):
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"""Returns a field associated with ``self``. """
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return self
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def sum(self, items):
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return Add(*items)
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EXRAW = ExpressionRawDomain()
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