Since Checkstyle 5.0
SuppressWithNearbyCommentFilter uses
nearby comments to suppress audit events.
Rationale: Same as SuppressionCommentFilter.
Whereas the SuppressionCommentFilter uses matched pairs of
filters to turn on/off comment matching,
SuppressWithNearbyCommentFilter uses
single comments. This requires fewer lines to mark a region, and
may be aesthetically preferable in some contexts.
Attention: This filter may only be specified within the TreeWalker module
(<module name="TreeWalker"/>) and only
applies to checks which are also defined within this module.
To filter non-TreeWalker checks like RegexpSingleline,
a
SuppressWithPlainTextCommentFilter or similar filter must be used.
SuppressWithNearbyCommentFilter can suppress Checks that have Treewalker as parent module.
| name | description | type | default value | since |
|---|---|---|---|---|
| checkC | Control whether to check C style comments (/* ... */). |
boolean | true |
5.0 |
| checkCPP | Control whether to check C++ style comments (//). |
boolean | true |
5.0 |
| checkFormat | Specify check pattern to suppress. | Pattern | ".*" |
5.0 |
| commentFormat | Specify comment pattern to trigger filter to begin suppression. | Pattern | "SUPPRESS CHECKSTYLE (\w+)" |
5.0 |
| idFormat | Specify check ID pattern to suppress. | Pattern | null |
8.24 |
| influenceFormat | Specify negative/zero/positive value that defines the number of lines preceding/at/following the suppression comment. | String | "0" |
5.0 |
| messageFormat | Define message pattern to suppress. | Pattern | null |
5.0 |
To configure a filter to suppress audit events for check
on any line with a comment SUPPRESS CHECKSTYLE check:
<module name="Checker">
<module name="TreeWalker">
<module name="SuppressWithNearbyCommentFilter"/>
</module>
</module>
Example:
private int [] array; // SUPPRESS CHECKSTYLE
To configure a filter to suppress all audit events on any line
containing the comment CHECKSTYLE IGNORE THIS LINE:
<module name="Checker">
<module name="TreeWalker">
<module name="SuppressWithNearbyCommentFilter">
<property name="commentFormat" value="CHECKSTYLE IGNORE THIS LINE"/>
<property name="checkFormat" value=".*"/>
<property name="influenceFormat" value="0"/>
</module>
</module>
</module>
Example:
public static final int lowerCaseConstant; // CHECKSTYLE IGNORE THIS LINE
To configure a filter so that
// OK to catch (Throwable|Exception|RuntimeException) here
permits the current and previous line to avoid generating an IllegalCatch
audit event:
<module name="Checker">
<module name="TreeWalker">
<module name="SuppressWithNearbyCommentFilter">
<property name="commentFormat" value="OK to catch (\w+) here"/>
<property name="checkFormat" value="IllegalCatchCheck"/>
<property name="messageFormat" value="$1"/>
<property name="influenceFormat" value="-1"/>
</module>
</module>
</module>
Example:
. . .
catch (RuntimeException re) {
// OK to catch RuntimeException here
}
catch (Throwable th) { ... }
. . .
To configure a filter so that
CHECKSTYLE IGNORE check FOR NEXTvar LINES
avoids triggering any audits for the given check for
the current line and the next var lines (for a total of var+1 lines):
<module name="Checker">
<module name="TreeWalker">
<module name="SuppressWithNearbyCommentFilter">
<property name="commentFormat"
value="CHECKSTYLE IGNORE (\w+) FOR NEXT (\d+) LINES"/>
<property name="checkFormat" value="$1"/>
<property name="influenceFormat" value="$2"/>
</module>
</module>
</module>
Example:
static final int lowerCaseConstant; // CHECKSTYLE IGNORE ConstantNameCheck FOR NEXT 3 LINES
static final int lowerCaseConstant1;
static final int lowerCaseConstant2;
static final int lowerCaseConstant3;
static final int lowerCaseConstant4; // will warn here
To configure a filter to avoid any audits on code like:
<module name="Checker">
<module name="TreeWalker">
<module name="SuppressWithNearbyCommentFilter">
<property name="commentFormat"
value="ALLOW (\\w+) ON PREVIOUS LINE"/>
<property name="checkFormat" value="$1"/>
<property name="influenceFormat" value="-1"/>
</module>
</module>
</module>
Example:
private int D2;
// ALLOW MemberName ON PREVIOUS LINE
. . .
To configure a filter to allow suppress one or more Checks (separated by "|") and demand comment no less than 14 symbols:
<module name="Checker">
<module name="TreeWalker">
<module name="SuppressWithNearbyCommentFilter">
<property name="commentFormat"
value="@cs\.suppress \[(\w+(\|\w+)*)\] \w[-\.'`,:;\w ]{14,}"/>
<property name="checkFormat" value="$1"/>
<property name="influenceFormat" value="1"/>
</module>
</module>
</module>
Example:
public static final int [] array; // @cs.suppress [ConstantName|NoWhitespaceAfter] A comment here
It is possible to specify an ID of checks, so that it can be leveraged by the
SuppressWithNearbyCommentFilter to skip validations. The following examples
show how to skip validations near code that has comment like
// @cs-: <ID/> (reason), where ID is the ID of checks you want to
suppress.
Example of Checkstyle checks and SuppressWithNearbyCommentFilter configuration (idFormat which is set to '$1' points that ID of the checks is in the first group of commentFormat regular expressions):
<module name="Checker">
<module name="TreeWalker">
<module name="SuppressWithNearbyCommentFilter">
<property name="commentFormat"
value="@cs\.suppress \[(\w+(\|\w+)*)\] \w[-\.'`,:;\w ]{14,}"/>
<property name="checkFormat" value="$1"/>
<property name="influenceFormat" value="1"/>
</module>
<module name="RegexpSinglelineJava">
<property name="id" value="ignore"/>
<property name="format" value="^.*@Ignore\s*$"/>
<property name="message" value="@Ignore should have a reason."/>
</module>
<module name="RegexpSinglelineJava">
<property name="id" value="systemout"/>
<property name="format" value="^.*System\.(out|err).*$"/>
<property name="message" value="Don't use System.out/err, use SLF4J instead."/>
</module>
</module>
</module>
Example:
@Ignore // @cs-: ignore (test has not been implemented yet)
@Test
public void testMethod() { }
public static void foo() {
System.out.println("Debug info."); // @cs-: systemout (should not fail RegexpSinglelineJava)
}
Example of how to configure the check to suppress more than one checks. The influence format is specified in the second regexp group.
<module name="Checker">
<module name="TreeWalker">
<module name="SuppressWithNearbyCommentFilter">
<property name="commentFormat" value="@cs-\: ([\w\|]+) influence (\d+)"/>
<property name="checkFormat" value="$1"/>
<property name="influenceFormat" value="$2"/>
</module>
</module>
</module>
Example:
// @cs-: ClassDataAbstractionCoupling influence 2
// @cs-: MagicNumber influence 4
@Service // no violations from ClassDataAbstractionCoupling here
@Transactional
public class UserService {
private int value = 10022; // no violations from MagicNumber here
}
com.puppycrawl.tools.checkstyle.filters