コード例 #1
0
    def find(self, tree):
        # We keep coefficients and spatial derivatives in separate lists
        # because we need separate criteria to uniqify the lists.
        self._coefficients = []
        self._spatialDerivatives = []

        self.visit(tree)

        # Coefficients define __eq__ and __hash__ so the straight uniqify works.
        # For spatial derivatives, we need to compare the coefficients.
        coefficients = uniqify(self._coefficients)
        spatialDerivatives = uniqify(self._spatialDerivatives, lambda x: x.operands()[0])

        return coefficients, spatialDerivatives