def _test_to_pymbolic(mapper, sym, use_symengine):
x, y = sym.symbols("x,y")
assert mapper(sym.Rational(3, 4)) == prim.Quotient(3, 4)
assert mapper(sym.Integer(6)) == 6
if not use_symengine:
assert mapper(sym.Subs(x**2, (x,), (y,))) == \
prim.Substitution(x_**2, ("x",), (y_,))
deriv = sym.Derivative(x**2, x)
assert mapper(deriv) == prim.Derivative(x_**2, ("x", ))
else:
assert mapper(sym.Subs(x**2, (x,), (y,))) == \
y_**2
deriv = sym.Derivative(x**2, x)
assert mapper(deriv) == 2 * x_
# functions
assert mapper(sym.Function("f")(x)) == prim.Variable("f")(x_)
assert mapper(sym.exp(x)) == prim.Variable("exp")(x_)
# indexed accesses
if not use_symengine:
i, j = sym.symbols("i,j")
assert mapper(sym.Indexed(x, i, j)) == x_[i_, j_]
# constants
import math
# FIXME: Why isn't this exact?
assert abs(mapper(sym.pi) - math.pi) < 1e-14
assert abs(mapper(sym.E) - math.e) < 1e-14
assert mapper(sym.I) == 1j
def make_random_expression(var_values, size):
from random import randrange
import pymbolic.primitives as p
v = randrange(1500)
size[0] += 1
if v < 500 and size[0] < 40:
term_count = randrange(2, 5)
if randrange(2) < 1:
cls = p.Sum
else:
cls = p.Product
return cls(
tuple(
make_random_expression(var_values, size)
for i in range(term_count)))
elif v < 750:
return make_random_value()
elif v < 1000:
var_name = "var_%d" % len(var_values)
assert var_name not in var_values
var_values[var_name] = make_random_value()
return p.Variable(var_name)
elif v < 1250:
# Cannot use '-' because that destroys numpy constants.
return p.Sum((make_random_expression(var_values, size),
-make_random_expression(var_values, size)))
elif v < 1500:
# Cannot use '/' because that destroys numpy constants.
return p.Quotient(make_random_expression(var_values, size),
make_random_expression(var_values, size))
def map_Rational(self, expr):
num = self.rec(expr.p)
denom = self.rec(expr.q)
if prim.is_zero(denom - 1):
return num
return prim.Quotient(num, denom)
def map_Rational(self, expr): # noqa
p, q = expr.p, expr.q
num = self.rec(p)
denom = self.rec(q)
if prim.is_zero(denom - 1):
return num
return prim.Quotient(num, denom)
def make_random_fp_expression(prefix, var_values, size, use_complex):
from random import randrange
import pymbolic.primitives as p
v = randrange(1500)
size[0] += 1
if v < 500 and size[0] < 40:
term_count = randrange(2, 5)
if randrange(2) < 1:
cls = p.Sum
else:
cls = p.Product
return cls(
tuple(
make_random_fp_expression(prefix, var_values, size,
use_complex)
for i in range(term_count)))
elif v < 750:
return make_random_fp_value(use_complex=use_complex)
elif v < 1000:
var_name = "var_%s_%d" % (prefix, len(var_values))
assert var_name not in var_values
var_values[var_name] = make_random_fp_value(use_complex=use_complex)
return p.Variable(var_name)
elif v < 1250:
# FIXME: What does this comment mean?
# Cannot use '-' because that destroys numpy constants.
return p.Sum((
make_random_fp_expression(prefix, var_values, size, use_complex),
-make_random_fp_expression(prefix, var_values, size, use_complex)))
elif v < 1500:
# FIXME: What does this comment mean?
# Cannot use '/' because that destroys numpy constants.
return p.Quotient(
make_random_fp_expression(prefix, var_values, size, use_complex),
make_random_fp_expression(prefix, var_values, size, use_complex))
else:
assert False
def _expression_division(expr, ctx):
return p.Quotient(*(expression(c, ctx) for c in expr.children))
def parse_postfix(self, pstate, min_precedence, left_exp):
import pymbolic.primitives as primitives
did_something = False
next_tag = pstate.next_tag()
if next_tag is _openpar and _PREC_CALL > min_precedence:
pstate.advance()
args, kwargs = self.parse_arglist(pstate)
if kwargs:
left_exp = primitives.CallWithKwargs(left_exp, args, kwargs)
else:
left_exp = primitives.Call(left_exp, args)
did_something = True
elif next_tag is _openbracket and _PREC_CALL > min_precedence:
pstate.advance()
pstate.expect_not_end()
left_exp = primitives.Subscript(left_exp, self.parse_expression(pstate))
pstate.expect(_closebracket)
pstate.advance()
did_something = True
elif next_tag is _if and _PREC_IF > min_precedence:
from pymbolic.primitives import If
then_expr = left_exp
pstate.advance()
pstate.expect_not_end()
condition = self.parse_expression(pstate, _PREC_LOGICAL_OR)
pstate.expect(_else)
pstate.advance()
else_expr = self.parse_expression(pstate)
left_exp = If(condition, then_expr, else_expr)
did_something = True
elif next_tag is _dot and _PREC_CALL > min_precedence:
pstate.advance()
pstate.expect(_identifier)
left_exp = primitives.Lookup(left_exp, pstate.next_str())
pstate.advance()
did_something = True
elif next_tag is _plus and _PREC_PLUS > min_precedence:
pstate.advance()
right_exp = self.parse_expression(pstate, _PREC_PLUS)
if isinstance(left_exp, primitives.Sum):
left_exp = primitives.Sum(left_exp.children + (right_exp,))
else:
left_exp = primitives.Sum((left_exp, right_exp))
did_something = True
elif next_tag is _minus and _PREC_PLUS > min_precedence:
pstate.advance()
right_exp = self.parse_expression(pstate, _PREC_PLUS)
if isinstance(left_exp, primitives.Sum):
left_exp = primitives.Sum(left_exp.children + ((-right_exp),)) # noqa pylint:disable=invalid-unary-operand-type
else:
left_exp = primitives.Sum((left_exp, -right_exp)) # noqa pylint:disable=invalid-unary-operand-type
did_something = True
elif next_tag is _times and _PREC_TIMES > min_precedence:
pstate.advance()
right_exp = self.parse_expression(pstate, _PREC_PLUS)
if isinstance(left_exp, primitives.Product):
left_exp = primitives.Product(left_exp.children + (right_exp,))
else:
left_exp = primitives.Product((left_exp, right_exp))
did_something = True
elif next_tag is _floordiv and _PREC_TIMES > min_precedence:
pstate.advance()
left_exp = primitives.FloorDiv(
left_exp, self.parse_expression(pstate, _PREC_TIMES))
did_something = True
elif next_tag is _over and _PREC_TIMES > min_precedence:
pstate.advance()
left_exp = primitives.Quotient(
left_exp, self.parse_expression(pstate, _PREC_TIMES))
did_something = True
elif next_tag is _modulo and _PREC_TIMES > min_precedence:
pstate.advance()
left_exp = primitives.Remainder(
left_exp, self.parse_expression(pstate, _PREC_TIMES))
did_something = True
elif next_tag is _power and _PREC_POWER > min_precedence:
pstate.advance()
left_exp = primitives.Power(
left_exp, self.parse_expression(pstate, _PREC_TIMES))
did_something = True
elif next_tag is _and and _PREC_LOGICAL_AND > min_precedence:
pstate.advance()
from pymbolic.primitives import LogicalAnd
left_exp = LogicalAnd((
left_exp,
self.parse_expression(pstate, _PREC_LOGICAL_AND)))
did_something = True
elif next_tag is _or and _PREC_LOGICAL_OR > min_precedence:
pstate.advance()
from pymbolic.primitives import LogicalOr
left_exp = LogicalOr((
left_exp,
self.parse_expression(pstate, _PREC_LOGICAL_OR)))
did_something = True
elif next_tag is _bitwiseor and _PREC_BITWISE_OR > min_precedence:
pstate.advance()
from pymbolic.primitives import BitwiseOr
left_exp = BitwiseOr((
left_exp,
self.parse_expression(pstate, _PREC_BITWISE_OR)))
did_something = True
elif next_tag is _bitwisexor and _PREC_BITWISE_XOR > min_precedence:
pstate.advance()
from pymbolic.primitives import BitwiseXor
left_exp = BitwiseXor((
left_exp,
self.parse_expression(pstate, _PREC_BITWISE_XOR)))
did_something = True
elif next_tag is _bitwiseand and _PREC_BITWISE_AND > min_precedence:
pstate.advance()
from pymbolic.primitives import BitwiseAnd
left_exp = BitwiseAnd((
left_exp,
self.parse_expression(pstate, _PREC_BITWISE_AND)))
did_something = True
elif next_tag is _rightshift and _PREC_SHIFT > min_precedence:
pstate.advance()
from pymbolic.primitives import RightShift
left_exp = RightShift(
left_exp,
self.parse_expression(pstate, _PREC_SHIFT))
did_something = True
elif next_tag is _leftshift and _PREC_SHIFT > min_precedence:
pstate.advance()
from pymbolic.primitives import LeftShift
left_exp = LeftShift(
left_exp,
self.parse_expression(pstate, _PREC_SHIFT))
did_something = True
elif next_tag in self._COMP_TABLE and _PREC_COMPARISON > min_precedence:
pstate.advance()
from pymbolic.primitives import Comparison
left_exp = Comparison(
left_exp,
self._COMP_TABLE[next_tag],
self.parse_expression(pstate, _PREC_COMPARISON))
did_something = True
elif next_tag is _colon and _PREC_SLICE >= min_precedence:
pstate.advance()
expr_pstate = pstate.copy()
assert not isinstance(left_exp, primitives.Slice)
from pytools.lex import ParseError
try:
next_expr = self.parse_expression(expr_pstate, _PREC_SLICE)
except ParseError:
# no expression follows, too bad.
left_exp = primitives.Slice((left_exp, None,))
else:
left_exp = _join_to_slice(left_exp, next_expr)
pstate.assign(expr_pstate)
did_something = True
elif next_tag is _comma and _PREC_COMMA > min_precedence:
# The precedence makes the comma left-associative.
pstate.advance()
if pstate.is_at_end() or pstate.next_tag() is _closepar:
if isinstance(left_exp, (tuple, list)) \
and not isinstance(left_exp, FinalizedContainer):
# left_expr is a container with trailing commas
pass
else:
left_exp = (left_exp,)
else:
new_el = self.parse_expression(pstate, _PREC_COMMA)
if isinstance(left_exp, (tuple, list)) \
and not isinstance(left_exp, FinalizedContainer):
left_exp = left_exp + (new_el,)
else:
left_exp = (left_exp, new_el)
did_something = True
return left_exp, did_something
