Skip to content

BSL060 — Double negatives

← All rules

Summary

Double negatives

Identifiers

Field Value
Rule code BSL060
Compatible alias DoubleNegatives
Severity WARNING
Enabled by default Yes
Implemented Yes
Tags brainoverload, badpractice

Behavior

  • The public identifier BSL060 and alias DoubleNegatives are stable.
  • The rule reports the cases documented on this page.
  • Suppressions and project configuration are applied before publication.
  • The rule requires neither an external analyzer nor network access.

Configuration and suppression

BSL### is the primary stable identifier. The compatible alias is accepted in select, ignore, and compatible block suppression comments.

[tool.onec-hbk-bsl]
select = ["BSL060"]
ignore = ["DoubleNegatives"]

All three suppression families support both a current line and a range. When an opening comment follows code, it affects only that line. Use any one form:

  • noqa:
Value = "example";  // noqa: BSL060
  • bsl-disable:
Value = "example";  // bsl-disable: BSL060
  • compatible BSLLS form:
Value = "example";  // BSLLS:DoubleNegatives-off

When the same opening comment is on a line by itself, it starts a range. Close it with the matching marker from the same family:

// noqa: BSL060
// code without this diagnostic
// noqa-enable: BSL060

// bsl-disable: BSL060
// code without this diagnostic
// bsl-enable: BSL060

// BSLLS:DoubleNegatives-off
// code without this diagnostic
// BSLLS:DoubleNegatives-on

To disable the rule until the end of the file, omit the closing noqa-enable, bsl-enable, or BSLLS:…-on marker.

Opening and closing markers must belong to the same family.

Description

Using double negatives makes the code harder to understand and can lead to errors when the developer mentally computes False instead of True, or vice versa. It is recommended to replace double negatives with conditional expressions that directly express the author's intentions.

Examples

Incorrect

If Not ValueTable.Find(SearchValue, "Column") <> Undefined Then
    // Do the action
EndIf;

Correct

If ValueTable.Find(LookupValue, "Column") = Undefined Then
    // Perform action
EndIf;

Sources