File: negated_expression.py

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# -*- coding: utf8 -*-
"""
.. module:: lesscpy.plib.negated_expression
    :synopsis: Node for unary negated expressions.

    Copyright (c)
    See LICENSE for details.
"""

from six import string_types

from .node import Node


class NegatedExpression(Node):
    """Expressions preceded by unary negation."""

    def parse(self, scope):
        val, = self.process(self.tokens, scope)
        if isinstance(val, string_types):
            return '-' + val
        return -val