attribute_evaluator.py

from dsl_info import *


def __RemoveNones(attributes):
    return [attribute for attribute in attributes if attribute]


def __CreatePairs(attributes):
    attributes = __RemoveNones(attributes)
    if len(attributes) % 2 != 0:
        raise Exception("Failed to make pairs - odd number of attributes")
    res = []
    for i in range(0, len(attributes), 2):
        res.append((attributes[i], attributes[i + 1]))
    return res


def __CheckOne(attributes):
    attributes = __RemoveNones(attributes)
    if len(attributes) != 1:
        raise Exception("Expect 1 attribute")
    return attributes[0]


attributesMap = {
    Nonterminal.AXIOM_BLOCK : __CheckOne,
    Nonterminal.TERMINALS_BLOCK : __CreatePairs,
    Nonterminal.KEYS_BLOCK : __RemoveNones,
    Nonterminal.NONTERMINALS_BLOCK : __RemoveNones,
}