ujson.StringParser.scala Maven / Gradle / Ivy
The newest version!
package ujson
import upickle.core.{ObjArrVisitor, Visitor}
/**
* Basic in-memory string parsing.
*
* This is probably the simplest Parser implementation, since there is
* no UTF-8 decoding, and the data is already fully available.
*
* This parser is limited to the maximum string size (~2G). Obviously
* for large JSON documents it's better to avoid using this parser and
* go straight from disk, to avoid having to load the whole thing into
* memory at once. So this limit will probably not be a problem in
* practice.
*/
private[ujson] final class StringParser[J](s: String) extends CharParser[J]{
private[this] val sLength = s.length
override def growBuffer(until: Int): Unit = ()
def readDataIntoBuffer(buffer: Array[Char], bufferOffset: Int) = {
if(buffer == null) (s.toCharArray, sLength == 0, sLength)
else (buffer, true, -1)
}
final def close() = ()
}
object StringParser extends Transformer[String]{
def transform[T](j: String, f: Visitor[_, T]) = new StringParser(j).parse(f)
}