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package spray.json
import org.scalatest._
trait SnakeCaseFormats { self: DerivedFormats =>
override def extractFieldName(paramName: String) =
FieldNaming.substituteCamel(paramName, '_')
}
trait KebabCaseFormats { self: DerivedFormats =>
override def extractFieldName(paramName: String) =
FieldNaming.substituteCamel(paramName, '-')
}
object FieldNaming {
@inline final private def isLower(ch: Char): Boolean =
((ch & 0x20) != 0) || (ch == '_')
@inline def substituteCamel(paramName: String, substitute: Char) = {
val length = paramName.length
val builder = new StringBuilder(length)
var i = 0
while (i < length) {
val cur = paramName(i)
if (isLower(cur) && i + 1 < length) {
builder.append(cur)
val next = paramName(i + 1)
if (!isLower(next)) {
builder.append(substitute)
builder.append((next ^ 0x20).toChar)
} else {
builder.append(next)
}
i += 1
} else {
builder.append((cur ^ 0x20).toChar)
}
i += 1
}
builder.result()
}
}
class FieldNameTests extends FlatSpec with FormatTests {
case class A(camelCASE: String, `__a_aB__`: Int, `a-a_B`: Int)
case class B(camelCaseA: A)
trait All extends DefaultJsonProtocol with DerivedFormats {
implicit val bFormat = jsonFormat[B]
}
{
object Protocol extends All with SnakeCaseFormats
import Protocol._
"snake_case" should behave like checkRoundtrip(
B(A("helloWorld", 0, 0)),
"""{"camel_case_a":{"camel_case":"helloWorld","__a_a_b__":0,"a-a_b":0}}"""
)
}
{
object Protocol extends All with KebabCaseFormats
import Protocol._
"kebab-case" should behave like checkRoundtrip(
B(A("helloWorld", 0, 0)),
"""{"camel-case-a":{"camel-case":"helloWorld","__a_a-b__":0,"a-a_b":0}}"""
)
}
}
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