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symast.py
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symast.py
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from __future__ import (absolute_import, division, print_function)
from sympy import cse
from sympy.core import AtomicExpr, Integer, S, Symbol
from sympy.tensor.indexed import IndexedBase
from sympy.core.basic import Basic
from sympy.codegen.ast import Assignment, CodeBlock
class While(Basic):
"""
Examples
--------
>>> from sympy import symbols, Gt, Abs
>>> from sympy.codegen import Assignment
>>> x, dx = symbols('x dx')
>>> expr = 1 - x**2
>>> whl = While(Gt(Abs(dx), 1e-9), [
... Assignment(dx, -expr/expr.diff(x)),
... AddAugmentedAssignment(x, dx)
... ])
"""
nargs = 2
class Scope(Basic):
nargs = 1
class PrintStatement(Basic):
""" (formatstring, Tuple)"""
nargs = 2
class Type(Basic):
""" a superset of NumPy naming, see https://docs.scipy.org/doc/numpy/user/basics.types.html
Arguments
---------
name : str
Either an explicit type: intc, intp, int8, int16, int32, int64, uint8, uint16, uint32, uint64,
float16, float32, float64, complex64, complex128, bool.
Or only kind (precision decided by code-printer): real, integer
"""
allowed_names = tuple('intc intp int8 int16 int32 int64 uint8 uint16 uint32'.split() +
'uint64 float16 float32 float64 complex64 complex128'.split() +
'real integer bool'.split())
__slots__ = []
def __new__(cls, name):
if isinstance(name, Type):
return name
if name not in cls.allowed_names:
raise ValueError("Unknown type: %s" % name)
return Basic.__new__(cls, name)
def _type_from_expr(expr, symb=None):
if symb is not None:
if symb.is_integer:
return Type('integer')
elif symb.is_complex:
return Type('complex')
if isinstance(expr, str):
return Type('real') # default
else:
if isinstance(expr, (int, Integer)):
return Type('integer')
if isinstance(expr, Symbol) and expr.is_integer:
return Type('integer')
expr = S(expr)
if expr.is_Relational:
return Type('bool')
else:
return Type('real')
class Variable(Basic):
""" name, type, constness """
def __new__(cls, symbol, type_=None, const=False):
if isinstance(symbol, Variable):
return symbol
if type_ is None:
type_ = _type_from_expr(symbol)
return Basic.__new__(cls, symbol, Type(type_), const)
@property
def symbol(self):
return self.args[0]
@property
def type(self):
return self.args[1]
@property
def const(self):
return self.args[2]
class Pointer(Basic):
""" name, type, value_const, pointer_const, restrict"""
def __new__(cls, symbol, type_=None, value_const=False, pointer_const=False, restrict=False):
if type_ is None:
type_ = _type_from_expr(symbol)
return Basic.__new__(cls, symbol, type_, value_const, pointer_const, restrict)
@property
def symbol(self):
return self.args[0]
@property
def type(self):
return self.args[1]
@property
def value_const(self):
return self.args[2]
@property
def pointer_const(self):
return self.args[3]
@property
def restrict(self):
return self.args[4]
class Declaration(Basic):
def __new__(cls, var, value=None, const=None):
if isinstance(var, (Variable, Pointer)):
if const is not None:
raise ValueError("Cannot change constness of an existing Variable/Pointer")
else:
if value is not None:
type_ = _type_from_expr(value, var)
else:
type_ = None
if isinstance(var, IndexedBase):
var = Pointer(var, type_, const)
else:
var = Variable(var, type_, const)
return Basic.__new__(cls, var, value)
def assign_cse(target, expr):
cses, (new_expr,) = cse(expr)
cse_declars = [Declaration(*args, const=True) for args in cses]
blck = cse_declars + [Assignment(target, new_expr)]
return Scope(CodeBlock(*blck))
class FunctionDefinition(Basic):
""" return_type, name, inputs, body """
def __new__(cls, return_type, name, inputs, body):
return Basic.__new__(cls, Type(return_type), name,
tuple(Declaration(inp) for inp in inputs), body)
class FunctionPrototype(Basic):
""" return_type, name, input_types """
@classmethod
def from_FunctionDefinition(cls, func_def):
return_type, name, inputs, body = func_def.args
return cls(return_type, name, tuple(inp.type for inp in inputs))
class PrinterSetting(AtomicExpr):
pass
class ReturnStatement(Basic):
pass
class FunctionCall(Basic):
""" name, args, statement """
def __new__(cls, name, args=(), statement=False):
return Basic.__new__(cls, name, args, statement)