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package spray.json
/** Serialize parametersOfCaseClasses as parameters_of_case_classes. */
trait SnakeCase { self: DerivedFormats =>
override def extractFieldName(paramName: String) =
FieldNaming.substituteCamel(paramName, '_')
}
/** Serialize parametersOfCaseClasses as parameters-of-case-classes. */
trait KebabCase { 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 final private def isUpper(ch: Char): Boolean =
((ch & 0x20) == 0) && (ch != '_')
@inline final private def toLower(ch: Char): Char =
if (ch == '_') '_' else (ch | 0x20).toChar
@inline final 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)
builder.append(toLower(cur))
if (isLower(cur) && (i + 1 < length)) {
val next = paramName(i + 1)
if (isUpper(next)) {
builder.append(substitute)
builder.append(toLower(next))
i += 1
}
}
i += 1
}
builder.result()
}
}
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