Argument validation code peace

# Checks whether argument conforms specified option specification.
#
# Arguments:
# - args - array containing arguments (all indecies must be zero-based sequentially continue over entire array)
# - i - index to start scanning arguments from (must point to item with option name before opening curly brace)
# - possibleValue - possible argument value (argument value can be bundled with it in arg)
# - outExists - array for marking option as defined
# - outType - array with -t|--type values
# - outAlias - array with -a|--alias values
# - outIsAssignable - array with -ia|--is-assignable values
# - outAllowBundle - array with -ab|--allow-bundle values
# - outAssignmentChar - array with -ac|--assignment-char values
function __checkArgumentConformsSpecification(args, i, possibleValue, outExists, outType, outAlias, outIsAssignable, outAllowBundle, outAssignmentChar) {
  arg = args[i]

  optionExists = utils::false()
  bundledAssignmentUsed = utils::false()

  if (arg in outExists)
    optionExists = utils::true()

  for (option in outAlias) {
    alias = outAlias[option]
    split(alias, aliasList, ",")

    if (utils::containsValue(aliasList, arg)) {
      optionExists = utils::true()
      break
    }
  }

  if (utils::containsMatchingKey(outExists, "^" arg)) {
    optionExists = utils::true()
    bundledAssignmentUsed = utils::true()
  }

  for (option in outAlias) {
    alias = outAlias[option]
    split(alias, aliasList, ",")

    if (utils::containsMatchingValue(aliasList, "^" arg)) {
      optionExists = utils::true()
      bundledAssignmentUsed = utils::true()
      break
    }
  }

  if (!optionExists)
    return errors::USER_UNKNOWN_OPTION_ERROR arg

  if (!outIsAssignable[arg] && bundledAssignmentUsed)
    return errors::USER_BUNDLED_ASSIGNMENT_NOT_SUPPORTED_ERROR arg
  if (!bundledAssignmentUsed && !possibleValue)
    return errors::USER_NO_VALUE_PROVIDED_ERROR arg

  if (!bundledAssignmentUsed)
    value = possibleValue
  else {
    if (outAssignmentChar[arg]) {
      j = index(outAssignmentChar[arg], arg) + 1
      value = substr(arg, j)
      if (!value)
        return utils::false()
    }
    sub("^" arg, "", value)
  }

  switch (outType[arg]) {
    case "integer":
      return utils::isInteger(value)
    case "float":
      return utils::isFloat(value)
    case "bool":
      return utils::isBool(value)
    case "string":
      return utils::true()
  }
}