pymbolic/interop/matchpy/mapper.py

+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Any
+
+
+if TYPE_CHECKING:
+    from collections.abc import Callable
+
+    from pymbolic.interop.matchpy import PymbolicOp
+
+
+class Mapper:
+    def __init__(self) -> None:
+        self.cache: dict[PymbolicOp, Any] = {}
+
+    def rec(self, expr: PymbolicOp) -> Any:
+        if expr in self.cache:
+            return self.cache[expr]
+
+        method: Callable[[PymbolicOp], Any] = getattr(self, expr._mapper_method)
+
+        return method(expr)
+
+    __call__ = rec

pymbolic/interop/sympy.py

+from __future__ import annotations
+
+
+__copyright__ = """
+Copyright (C) 2017 Matt Wala
+Copyright (C) 2009-2013 Andreas Kloeckner
+"""
+
+__license__ = """
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+"""
+
+import sympy
+
+import pymbolic.primitives as prim
+from pymbolic.interop.common import PymbolicToSympyLikeMapper, SympyLikeToPymbolicMapper
+
+
+__doc__ = """
+.. class:: SympyToPymbolicMapper
+
+    .. method:: __call__(expr)
+
+.. class:: PymbolicToSympyMapper
+
+    .. method:: __call__(expr)
+"""
+
+
+# {{{ sympy -> pymbolic
+
+class SympyToPymbolicMapper(SympyLikeToPymbolicMapper):
+
+    def map_ImaginaryUnit(self, expr):  # noqa
+        return 1j
+
+    map_Float = SympyLikeToPymbolicMapper.to_float  # noqa: N815
+
+    map_NumberSymbol = SympyLikeToPymbolicMapper.to_float  # noqa: N815
+
+    def function_name(self, expr):
+        return type(expr).__name__
+
+    # only called for Py2
+    def map_long(self, expr):
+        return long(expr)  # noqa  pylint:disable=undefined-variable
+
+    def map_Indexed(self, expr):  # noqa
+        if len(expr.args) == 2:
+            return prim.Subscript(
+                self.rec(expr.args[0].args[0]),
+                self.rec(expr.args[1]),
+                )
+
+        return prim.Subscript(
+            self.rec(expr.args[0].args[0]),
+            tuple([self.rec(i) for i in expr.args[1:]])
+            )
+
+    def map_CSE(self, expr):  # noqa
+        return prim.CommonSubexpression(
+                self.rec(expr.args[0]), expr.prefix, expr.scope)
+
+    def map_Piecewise(self, expr):  # noqa
+        # We only handle piecewises with 2 arguments!
+        if not len(expr.args) == 2:
+            raise NotImplementedError
+        # We only handle if/else cases
+        if not (expr.args[1][1].is_Boolean and bool(expr.args[1][1]) is True):
+            raise NotImplementedError
+        then = self.rec(expr.args[0][0])
+        else_ = self.rec(expr.args[1][0])
+        cond = self.rec(expr.args[0][1])
+        return prim.If(cond, then, else_)
+
+# }}}
+
+
+# {{{ pymbolic -> sympy
+
+class PymbolicToSympyMapper(PymbolicToSympyLikeMapper):
+
+    sym = sympy
+
+    def raise_conversion_error(self, expr):
+        raise RuntimeError(f"do not know how to translate '{expr}' to sympy")
+
+    def map_subscript(self, expr):
+        return self.sym.Indexed(
+            self.sym.IndexedBase(self.rec(expr.aggregate)),
+            *[self.rec(i) for i in expr.index_tuple]
+            )
+# }}}
+
+
+class CSE(sympy.Function):
+    """A function to translate to a Pymbolic CSE."""
+    nargs = 1
+
+
+def make_cse(arg, prefix=None, scope=None):
+    result = CSE(arg)
+    result.prefix = prefix
+    result.scope = scope
+    return result
+
+
+# vim: fdm=marker