tethys.JsonStreaming.scala Maven / Gradle / Ivy
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package tethys
import tethys.readers.{FieldName, ReaderError}
import tethys.readers.tokens.TokenIterator
import tethys.writers.tokens.TokenWriter
object JsonStreaming {
def streamValue(from: TokenIterator, to: TokenWriter)(implicit
fieldName: FieldName
): Unit = writeCurrentValue(from, to)
private def writeCurrentValue(it: TokenIterator, writer: TokenWriter)(implicit
fieldName: FieldName
): Unit = {
val token = it.currentToken()
if (token.isArrayStart) writeArray(it, writer)
else if (token.isObjectStart) writeObject(it, writer)
else if (token.isStringValue) writer.writeString(it.string())
else if (token.isNumberValue) writer.writeRawNumber(it.number())
else if (token.isBooleanValue) writer.writeBoolean(it.boolean())
else if (token.isNullValue) writer.writeNull()
else ReaderError.wrongJson(s"Expects value start but $token found")
it.next()
}
private def writeArray(it: TokenIterator, writer: TokenWriter)(implicit
fieldName: FieldName
): Unit = {
it.next()
writer.writeArrayStart()
var index: Int = 0
while (!it.currentToken().isArrayEnd) {
writeCurrentValue(it, writer)(fieldName.appendArrayIndex(index))
index = index + 1
}
writer.writeArrayEnd()
}
private def writeObject(it: TokenIterator, writer: TokenWriter)(implicit
fieldName: FieldName
): Unit = {
it.next()
writer.writeObjectStart()
while (!it.currentToken().isObjectEnd) {
val token = it.currentToken()
if (token.isFieldName) {
val name = it.fieldName()
writer.writeFieldName(name)
writeCurrentValue(it.next(), writer)(fieldName.appendFieldName(name))
} else {
ReaderError.wrongJson(s"Expects field name but $token found")
}
}
writer.writeObjectEnd()
}
}