include::../description.adoc[]

== Noncompliant Code Example

----
switch ($i) {
  case 1: 
    doFirst();
    doSomething();
    break;
  case 2: 
    doSomethingDifferent();
    break;
  case 3:  // Noncompliant; duplicates case 1's implementation
    doFirst();
    doSomething(); 
    break;
  default: 
    doTheRest();
}

if ($a >= 0 && $a < 10) {
  doFirst();
  doTheThing();
}
else if ($a >= 10 && $a < 20) {
  doTheOtherThing();
}
else if ($a >= 20 && $a < 50) {
  doFirst();
  doTheThing();  // Noncompliant; duplicates first condition
}
----

== Exceptions

Blocks in an ``++if++`` chain that contain a single line of code are ignored, as are blocks in a ``++switch++`` statement that contain a single line of code with or without a following ``++break++``.


----
if ($a >= 0 && $a < 10) {
  doTheThing();
}
else if ($a >= 10 && $a < 20) {
  doTheOtherThing();
}
else if ($a >= 20 && $a < 50) {
  doTheThing();  // no issue, usually this is done on purpose to increase the readability
}
----

But this exception does not apply to ``++if++`` chains without ``++else++``-s, or to ``++switch++``-es without default clauses when all branches have the same single line of code. In case of ``++if++`` chains with ``++else++``-s, or of ``++switch++``-es with default clauses, rule S3923 raises a bug. 

----
if ($a >= 0 && $a < 10) {
  doTheThing();
}
else if ($a >= 20 && $a < 50) {
  doTheThing();   //Noncompliant; this might have been done on purpose but probably not
}
----

ifdef::env-github,rspecator-view[]

'''
== Implementation Specification
(visible only on this page)

include::../message.adoc[]

include::../highlighting.adoc[]

'''
== Comments And Links
(visible only on this page)

include::../comments-and-links.adoc[]
endif::env-github,rspecator-view[]