rspec/rules/S5846/kotlin/rule.adoc

== Why is this an issue?

include::../description.adoc[]


=== Noncompliant code example

[source,kotlin]
----
val p = Pattern.compile("^$", Pattern.MULTILINE) // Noncompliant
val r = Regex("^$", RegexOption.MULTILINE) // Noncompliant

// Alternatively
val p = Pattern.compile("(?m)^$") // Noncompliant
val r = Regex("(?m)^$") // Noncompliant

fun containsEmptyLines(str: String) : Boolean {
    return p.matcher(str).find()
}

fun containsEmptyLinesKotlin(str: String) = r.find(str) != null

// ...
println(containsEmptyLines("a\n\nb")) // correctly prints 'true'
println(containsEmptyLinesKotlin("a\n\nb")) // correctly prints 'true'

println(containsEmptyLines("")) // incorrectly prints 'false'
println(containsEmptyLinesKotlin("")) // incorrectly prints 'false'
----



=== Compliant solution

[source,kotlin]
----
val p = Pattern.compile("^$", Pattern.MULTILINE) // Noncompliant
val r = Regex("^$", RegexOption.MULTILINE) // Noncompliant

fun containsEmptyLines(str: String) : Boolean {
    return p.matcher(str).find() || str.isEmpty()
}

fun containsEmptyLinesKotlin(str: String) = r.find(str) != null || str.isEmpty()

// ...
println(containsEmptyLines("a\n\nb")) // correctly prints 'true'
println(containsEmptyLinesKotlin("a\n\nb")) // correctly prints 'true'

println(containsEmptyLines("")) // correctly prints 'true'
println(containsEmptyLinesKotlin("")) // correctly prints 'true'
----



include::../implementation.adoc[]