SingleSpaceSeparator.md

Pattern: Malformed padding around non-whitespace character

Issue: -

Description

Checks that non-whitespace characters are separated by no more than one whitespace. Separating characters by tabs or multiple spaces will be reported. Currently the check doesn't permit horizontal alignment. To inspect whitespaces before and after comments, set the property validateComments to true.

Setting validateComments to false will ignore cases like:

int i;  // Multiple whitespaces before comment tokens will be ignored.
private void foo(int  /* whitespaces before and after block-comments will be
ignored */  i) {

Sometimes, users like to space similar items on different lines to the same column position for easier reading. This feature isn't supported by this check, so both braces in the following case will be reported as violations.

public long toNanos(long d)  { return d;} // 2 violations
public long toMicros(long d) { return d / (C1 / C0); }

Examples

To configure the check:

<module name="SingleSpaceSeparator"/>

To configure the check so that it validates comments:

<module name="SingleSpaceSeparator">
  <property name="validateComments" value="true"/>
</module>

Further Reading

• checkstyle - SingleSpaceSeparator