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- from itertools import product, combinations
- from ..node import Scope, OP_ADD, OP_MUL
- from ..possibilities import Possibility as P, MESSAGES
- from ..translate import _
- def match_sort_multiplicants(node):
- """
- Sort multiplicant factors by swapping
- x * 2 -> 2x
- """
- assert node.is_op(OP_MUL)
- p = []
- scope = Scope(node)
- for i, n in enumerate(scope[1:]):
- left_nb = scope[i]
- if n.is_numeric() and not left_nb.is_numeric():
- p.append(P(node, move_constant, (scope, n, left_nb)))
- return p
- def move_constant(root, args):
- scope, constant, destination = args
- scope.replace(destination, constant * destination)
- scope.remove(constant)
- return scope.as_nary_node()
- MESSAGES[move_constant] = \
- _('Move constant {2} to the left of the multiplication {0}.')
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