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ProtobufGenerator.scala
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ProtobufGenerator.scala
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package com.trueaccord.scalapb.compiler
import com.google.protobuf.Descriptors._
import com.google.protobuf.CodedOutputStream
import com.google.protobuf.{ByteString => GoogleByteString}
import com.google.protobuf.compiler.PluginProtos.{CodeGeneratorRequest, CodeGeneratorResponse}
import com.trueaccord.scalapb.TextFormat
import com.trueaccord.scalapb.textformat.TextFormatUtils
import scala.collection.JavaConversions._
case class GeneratorParams(javaConversions: Boolean = false, flatPackage: Boolean = false, grpc: Boolean = false)
class ProtobufGenerator(val params: GeneratorParams) extends DescriptorPimps {
def printEnum(e: EnumDescriptor, printer: FunctionalPrinter): FunctionalPrinter = {
val name = e.nameSymbol
printer
.add(s"sealed trait $name extends com.trueaccord.scalapb.GeneratedEnum {")
.indent
.add(s"type EnumType = $name")
.print(e.getValues) {
case (v, p) => p.add(
s"def is${v.objectName}: Boolean = false")
}
.add(s"def isUnrecognized: Boolean = false")
.add(s"def companion: com.trueaccord.scalapb.GeneratedEnumCompanion[$name] = $name")
.outdent
.add("}")
.add("")
.add(s"object $name extends com.trueaccord.scalapb.GeneratedEnumCompanion[$name] {")
.indent
.print(e.getValues) {
case (v, p) => p.addM(
s"""@SerialVersionUID(0L)
|case object ${v.getName.asSymbol} extends $name {
| val value = ${v.getNumber}
| val index = ${v.getIndex}
| val name = "${v.getName}"
| override def is${v.objectName}: Boolean = true
|}
|""")
}
.addM(
s"""@SerialVersionUID(0L)
|case class Unrecognized(value: Int) extends $name {
| val name = "UNRECOGNIZED"
| val index = -1
| override def isUnrecognized: Boolean = true
|}
|""")
.add(s"lazy val values = Seq(${e.getValues.map(_.getName.asSymbol).mkString(", ")})")
.add(s"def fromValue(value: Int): $name = value match {")
.print(e.valuesWithNoDuplicates) {
case (v, p) => p.add(s" case ${v.getNumber} => ${v.getName.asSymbol}")
}
.add(s" case __other => Unrecognized(__other)")
.add("}")
.when(e.isTopLevel)(_.add(s"def descriptor: com.google.protobuf.Descriptors.EnumDescriptor = ${e.getFile.fileDescriptorObjectName}.descriptor.getEnumTypes.get(${e.getIndex})"))
.when(!e.isTopLevel)(_.add(s"def descriptor: com.google.protobuf.Descriptors.EnumDescriptor = ${e.getContainingType.scalaTypeName}.descriptor.getEnumTypes.get(${e.getIndex})"))
.when(params.javaConversions) {
_.addM(
s"""|def fromJavaValue(pbJavaSource: ${e.javaTypeName}): $name = fromValue(pbJavaSource.getNumber)
|def toJavaValue(pbScalaSource: $name): ${e.javaTypeName} = ${e.javaTypeName}.valueOf(pbScalaSource.value)""")
}
.outdent
.add("}")
}
def printOneof(e: OneofDescriptor, printer: FunctionalPrinter): FunctionalPrinter = {
printer
.add(s"sealed trait ${e.upperScalaName} extends com.trueaccord.scalapb.GeneratedOneof {")
.indent
.add(s"def isEmpty: Boolean = false")
.add(s"def isDefined: Boolean = true")
.add(s"def number: Int")
.print(e.fields) {
case (v, p) => p
.add(s"def is${v.upperScalaName}: Boolean = false")
}
.print(e.fields) {
case (v, p) => p
.add(s"def ${v.scalaName.asSymbol}: Option[${v.scalaTypeName}] = None")
}
.outdent
.addM(
s"""}
|object ${e.upperScalaName} extends {
| @SerialVersionUID(0L)
| case object Empty extends ${e.upperScalaName} {
| override def isEmpty: Boolean = true
| override def isDefined: Boolean = false
| override def number: Int = 0
| }
|""")
.indent
.print(e.fields) {
case (v, p) =>
p.addM(
s"""@SerialVersionUID(0L)
|case class ${v.upperScalaName}(value: ${v.scalaTypeName}) extends ${e.upperScalaName} {
| override def is${v.upperScalaName}: Boolean = true
| override def ${v.scalaName.asSymbol}: Option[${v.scalaTypeName}] = Some(value)
| override def number: Int = ${v.getNumber}
|}""")
}
.outdent
.add("}")
}
def escapeString(raw: String): String = raw.map {
case u if u >= ' ' && u <= '~' => u.toString
case '\b' => "\\b"
case '\f' => "\\f"
case '\n' => "\\n"
case '\r' => "\\r"
case '\t' => "\\t"
case '\\' => "\\\\"
case '\"' => "\\\""
case '\'' => "\\\'"
case c: Char => "\\u%4s".format(c.toInt.toHexString).replace(' ','0')
}.mkString("\"", "", "\"")
def defaultValueForGet(field: FieldDescriptor, uncustomized: Boolean = false) = {
// Needs to be 'def' and not val since for some of the cases it's invalid to call it.
def defaultValue = field.getDefaultValue
val baseDefaultValue = field.getJavaType match {
case FieldDescriptor.JavaType.INT => defaultValue.toString
case FieldDescriptor.JavaType.LONG => defaultValue.toString + "L"
case FieldDescriptor.JavaType.FLOAT =>
val f = defaultValue.asInstanceOf[Float]
if (f.isPosInfinity) "Float.PositiveInfinity"
else if (f.isNegInfinity) "Float.NegativeInfinity"
else if (f.isNaN) "Float.NaN"
else f.toString + "f"
case FieldDescriptor.JavaType.DOUBLE =>
val d = defaultValue.asInstanceOf[Double]
if (d.isPosInfinity) "Double.PositiveInfinity"
else if (d.isNegInfinity) "Double.NegativeInfinity"
else if (d.isNaN) "Double.NaN"
else d.toString
case FieldDescriptor.JavaType.BOOLEAN => Boolean.unbox(defaultValue.asInstanceOf[java.lang.Boolean])
case FieldDescriptor.JavaType.BYTE_STRING =>
val d = defaultValue.asInstanceOf[GoogleByteString]
if (d.isEmpty)
"com.google.protobuf.ByteString.EMPTY"
else
d.map(_.toString).mkString("com.google.protobuf.ByteString.copyFrom(Array[Byte](", ", ", "))")
case FieldDescriptor.JavaType.STRING => escapeString(defaultValue.asInstanceOf[String])
case FieldDescriptor.JavaType.MESSAGE =>
field.getMessageType.scalaTypeName + ".defaultInstance"
case FieldDescriptor.JavaType.ENUM =>
field.getEnumType.scalaTypeName + "." + defaultValue.asInstanceOf[EnumValueDescriptor].getName.asSymbol
}
if (!uncustomized && field.customSingleScalaTypeName.isDefined)
s"${field.typeMapper}.toCustom($baseDefaultValue)" else baseDefaultValue
}
def defaultValueForDefaultInstance(field: FieldDescriptor) =
if (field.supportsPresence) "None"
else if (field.isMap) "Map.empty"
else if (field.isRepeated) "Nil"
else defaultValueForGet(field)
def javaToScalaConversion(field: FieldDescriptor) = {
val baseValueConversion = field.getJavaType match {
case FieldDescriptor.JavaType.INT => MethodApplication("intValue")
case FieldDescriptor.JavaType.LONG => MethodApplication("longValue")
case FieldDescriptor.JavaType.FLOAT => MethodApplication("floatValue")
case FieldDescriptor.JavaType.DOUBLE => MethodApplication("doubleValue")
case FieldDescriptor.JavaType.BOOLEAN => MethodApplication("booleanValue")
case FieldDescriptor.JavaType.BYTE_STRING => Identity
case FieldDescriptor.JavaType.STRING => Identity
case FieldDescriptor.JavaType.MESSAGE => FunctionApplication(
field.getMessageType.scalaTypeName + ".fromJavaProto")
case FieldDescriptor.JavaType.ENUM => FunctionApplication(
field.getEnumType.scalaTypeName + ".fromJavaValue")
}
baseValueConversion andThen toCustomTypeExpr(field)
}
def javaFieldToScala(container: String, field: FieldDescriptor) = {
val javaHas = container + ".has" + field.upperScalaName
val javaGetter = if (field.isRepeated)
container + ".get" + field.upperScalaName + "List"
else
container + ".get" + field.upperScalaName
val valueConversion = javaToScalaConversion(field)
if (field.supportsPresence)
s"if ($javaHas) Some(${valueConversion.apply(javaGetter, isCollection = false)}) else None"
else valueConversion(javaGetter, isCollection = field.isRepeated)
}
def javaMapFieldToScala(container: String, field: FieldDescriptor) = {
// TODO(thesamet): if both unit conversions are NoOp, we can omit the map call.
def unitConversion(n: String, field: FieldDescriptor) = javaToScalaConversion(field).apply(n, isCollection = false)
s"${container}.get${field.upperScalaName}.map(__pv => (${unitConversion("__pv._1", field.mapType.keyField)}, ${unitConversion("__pv._2", field.mapType.valueField)})).toMap"
}
def scalaToJava(field: FieldDescriptor, boxPrimitives: Boolean): Expression = {
def maybeBox(name: String) = if (boxPrimitives) FunctionApplication(name) else Identity
field.getJavaType match {
case FieldDescriptor.JavaType.INT => maybeBox("Int.box")
case FieldDescriptor.JavaType.LONG => maybeBox("Long.box")
case FieldDescriptor.JavaType.FLOAT => maybeBox("Float.box")
case FieldDescriptor.JavaType.DOUBLE => maybeBox("Double.box")
case FieldDescriptor.JavaType.BOOLEAN => maybeBox("Boolean.box")
case FieldDescriptor.JavaType.BYTE_STRING => Identity
case FieldDescriptor.JavaType.STRING => Identity
case FieldDescriptor.JavaType.MESSAGE => FunctionApplication(
field.getMessageType.scalaTypeName + ".toJavaProto")
case FieldDescriptor.JavaType.ENUM => if (field.getFile.isProto3)
(MethodApplication("value") andThen maybeBox("Int.box"))
else
FunctionApplication(field.getEnumType.scalaTypeName + ".toJavaValue")
}
}
def assignScalaMapToJava(scalaObject: String, javaObject: String, field: FieldDescriptor): String = {
def valueConvert(v: String, field: FieldDescriptor) =
scalaToJava(field, boxPrimitives = true).apply(v, isCollection = false)
val getMutableMap = s"getMutable${field.upperScalaName}" + (
if (field.mapType.valueField.isEnum) "Value" else "")
s"""$javaObject
| .$getMutableMap()
| .putAll(
| $scalaObject.${fieldAccessorSymbol(field)}.map {
| __kv => (${valueConvert("__kv._1", field.mapType.keyField)}, ${valueConvert("__kv._2", field.mapType.valueField)})
| })
|""".stripMargin
}
def assignScalaFieldToJava(scalaObject: String,
javaObject: String, field: FieldDescriptor): String =
if (field.isMap) assignScalaMapToJava(scalaObject, javaObject, field) else {
val javaSetter = javaObject +
(if (field.isRepeated) ".addAll" else
".set") + field.upperScalaName + (
if (field.isEnum && field.getFile.isProto3) "Value" else "")
val scalaGetter = scalaObject + "." + fieldAccessorSymbol(field)
val scalaExpr = (toBaseTypeExpr(field) andThen scalaToJava(field, boxPrimitives = field.isRepeated)).apply(
scalaGetter, isCollection = !field.isSingular)
if (field.supportsPresence || field.isInOneof)
s"$scalaExpr.foreach($javaSetter)"
else
s"$javaSetter($scalaExpr)"
}
def generateGetField(message: Descriptor)(fp: FunctionalPrinter) = {
val signature = "def getField(__field: com.google.protobuf.Descriptors.FieldDescriptor): scala.Any = "
if (message.fields.nonEmpty)
fp.add(signature + "{")
.indent
.add("__field.getNumber match {")
.indent
.print(message.fields) {
case (f, fp) =>
val e = toBaseFieldType(f)
.apply(fieldAccessorSymbol(f), isCollection = !f.isSingular)
if (f.supportsPresence || f.isInOneof)
fp.add(s"case ${f.getNumber} => $e.getOrElse(null)")
else if (f.isOptional) {
// In proto3, drop default value
fp.add(s"case ${f.getNumber} => {")
.indent
.add(s"val __t = $e")
.add({
val cond = if (!f.isEnum)
s"__t != ${defaultValueForGet(f, uncustomized = true)}"
else
s"__t.getNumber() != 0"
s"if ($cond) __t else null"
})
.outdent
.add("}")
} else fp.add(s"case ${f.getNumber} => $e")
}
.outdent
.add("}")
.outdent
.add("}")
else fp.add(signature + "throw new MatchError(__field)")
}
def generateWriteSingleValue(field: FieldDescriptor, valueExpr: String)(fp: FunctionalPrinter):
FunctionalPrinter = {
if (field.isMessage) {
fp.addM(
s"""output.writeTag(${field.getNumber}, 2)
|output.writeRawVarint32($valueExpr.serializedSize)
|$valueExpr.writeTo(output)""")
} else if (field.isEnum)
fp.add(s"output.writeEnum(${field.getNumber}, $valueExpr.value)")
else {
val capTypeName = Types.capitalizedType(field.getType)
fp.add(s"output.write$capTypeName(${field.getNumber}, $valueExpr)")
}
}
def sizeExpressionForSingleField(field: FieldDescriptor, expr: String): String =
if (field.isMessage) {
val size = s"$expr.serializedSize"
CodedOutputStream.computeTagSize(field.getNumber) + s" + com.google.protobuf.CodedOutputStream.computeRawVarint32Size($size) + $size"
} else if(field.isEnum)
s"com.google.protobuf.CodedOutputStream.computeEnumSize(${field.getNumber}, ${expr}.value)"
else {
val capTypeName = Types.capitalizedType(field.getType)
s"com.google.protobuf.CodedOutputStream.compute${capTypeName}Size(${field.getNumber}, ${expr})"
}
def fieldAccessorSymbol(field: FieldDescriptor) =
if (field.isInOneof)
(field.getContainingOneof.scalaName.asSymbol + "." + field.scalaName.asSymbol)
else
field.scalaName.asSymbol
def toBaseTypeExpr(field: FieldDescriptor) =
if (field.customSingleScalaTypeName.isDefined) FunctionApplication(field.typeMapper + ".toBase")
else Identity
def toBaseFieldType(field: FieldDescriptor) = if (field.isEnum)
(toBaseTypeExpr(field) andThen MethodApplication("valueDescriptor"))
else toBaseTypeExpr(field)
def toBaseType(field: FieldDescriptor)(expr: String) =
toBaseTypeExpr(field).apply(expr, isCollection = false)
def toCustomTypeExpr(field: FieldDescriptor) =
if (field.customSingleScalaTypeName.isEmpty) Identity
else FunctionApplication(s"${field.typeMapper}.toCustom")
def toCustomType(field: FieldDescriptor)(expr: String) =
toCustomTypeExpr(field).apply(expr, isCollection = false)
def generateSerializedSizeForField(field: FieldDescriptor, fp: FunctionalPrinter): FunctionalPrinter = {
val fieldNameSymbol = fieldAccessorSymbol(field)
if (field.isRequired) {
fp.add("__size += " + sizeExpressionForSingleField(field, toBaseType(field)(fieldNameSymbol)))
} else if (field.isSingular) {
fp.add(s"if (${toBaseType(field)(fieldNameSymbol)} != ${defaultValueForGet(field, true)}) { __size += ${sizeExpressionForSingleField(field, toBaseType(field)(fieldNameSymbol))} }")
} else if (field.isOptional) {
fp.add(s"if ($fieldNameSymbol.isDefined) { __size += ${sizeExpressionForSingleField(field, toBaseType(field)(fieldNameSymbol + ".get"))} }")
} else if (field.isRepeated) {
val tagSize = CodedOutputStream.computeTagSize(field.getNumber)
if (!field.isPacked)
Types.fixedSize(field.getType) match {
case Some(size) => fp.add(s"__size += ${size + tagSize} * $fieldNameSymbol.size")
case None => fp.add(
s"$fieldNameSymbol.foreach($fieldNameSymbol => __size += ${sizeExpressionForSingleField(field, toBaseType(field)(fieldNameSymbol))})")
}
else {
val fieldName = field.scalaName
fp
.addM(
s"""if($fieldNameSymbol.nonEmpty) {
| __size += $tagSize + com.google.protobuf.CodedOutputStream.computeRawVarint32Size(${fieldName}SerializedSize) + ${fieldName}SerializedSize
|}""")
}
} else throw new RuntimeException("Should not reach here.")
}
def generateSerializedSize(message: Descriptor)(fp: FunctionalPrinter) = {
fp
.add("@transient")
.add("lazy val serializedSize: Int = {")
.indent
.add("var __size = 0")
.print(message.fields)(generateSerializedSizeForField)
.add("__size")
.outdent
.add("}")
}
def generateSerializedSizeForPackedFields(message: Descriptor)(fp: FunctionalPrinter) =
fp
.print(message.fields.filter(_.isPacked).zipWithIndex) {
case ((field, index), printer) =>
printer
.add(s"lazy val ${field.scalaName}SerializedSize =")
.call({ fp =>
Types.fixedSize(field.getType) match {
case Some(size) =>
fp.add(s" $size * ${field.scalaName.asSymbol}.size")
case None =>
val capTypeName = Types.capitalizedType(field.getType)
val sizeFunc = Seq(s"com.google.protobuf.CodedOutputStream.compute${capTypeName}SizeNoTag")
val fromEnum = if (field.isEnum) Seq(s"(_: ${field.baseSingleScalaTypeName}).value") else Nil
val fromCustom = if (field.customSingleScalaTypeName.isDefined)
Seq(s"${field.typeMapper}.toBase")
else Nil
val funcs = sizeFunc ++ fromEnum ++ fromCustom
fp.add(s" ${field.scalaName.asSymbol}.map(${composeGen(funcs)}).sum")
}
})
}
private def composeGen(funcs: Seq[String]) =
if (funcs.length == 1) funcs(0)
else s"(${funcs(0)} _)" + funcs.tail.map(func => s".compose($func)").mkString
def generateWriteTo(message: Descriptor)(fp: FunctionalPrinter) =
fp.add(s"def writeTo(output: com.google.protobuf.CodedOutputStream): Unit = {")
.indent
.print(message.fields.sortBy(_.getNumber).zipWithIndex) {
case ((field, index), printer) =>
val fieldNameSymbol = fieldAccessorSymbol(field)
val capTypeName = Types.capitalizedType(field.getType)
if (field.isPacked) {
val writeFunc = composeGen(Seq(
s"output.write${capTypeName}NoTag") ++ (
if (field.isEnum) Seq(s"(_: ${field.baseSingleScalaTypeName}).value") else Nil
) ++ (
if (field.customSingleScalaTypeName.isDefined)
Seq(s"${field.typeMapper}.toBase")
else Nil
))
printer.addM(
s"""if (${fieldNameSymbol}.nonEmpty) {
| output.writeTag(${field.getNumber}, 2)
| output.writeRawVarint32(${fieldNameSymbol}SerializedSize)
| ${fieldNameSymbol}.foreach($writeFunc)
|};""")
} else if (field.isRequired) {
generateWriteSingleValue(field, toBaseType(field)(fieldNameSymbol))(printer)
} else if (field.isSingular) {
// Singular that are not required are written only if they don't equal their default
// value.
printer
.add(s"{")
.indent
.add(s"val __v = ${toBaseType(field)(fieldNameSymbol)}")
.add(s"if (__v != ${defaultValueForGet(field, uncustomized = true)}) {")
.indent
.call(generateWriteSingleValue(field, "__v"))
.outdent
.add("}")
.outdent
.add("};")
} else {
printer
.add(s"${fieldNameSymbol}.foreach { __v => ")
.indent
.call(generateWriteSingleValue(field, toBaseType(field)("__v")))
.outdent
.add("};")
}
}
.outdent
.add("}")
def printConstructorFieldList(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val regularFields = message.fields.collect {
case field if !field.isInOneof =>
val typeName = field.scalaTypeName
val ctorDefaultValue =
if (field.isOptional && field.supportsPresence) " = None"
else if (field.isSingular) " = " + defaultValueForGet(field)
else if (field.isMap) " = Map.empty"
else if (field.isRepeated) " = Nil"
else ""
s"${field.scalaName.asSymbol}: $typeName$ctorDefaultValue"
}
val oneOfFields = message.getOneofs.map {
oneOf =>
s"${oneOf.scalaName.asSymbol}: ${oneOf.scalaTypeName} = ${oneOf.empty}"
}
printer.addWithDelimiter(",")(regularFields ++ oneOfFields)
}
def generateMergeFrom(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val myFullScalaName = message.scalaTypeName
printer.add(
s"def mergeFrom(__input: com.google.protobuf.CodedInputStream): $myFullScalaName = {")
.indent
.print(message.fieldsWithoutOneofs)((field, printer) =>
if (!field.isRepeated)
printer.add(s"var __${field.scalaName} = this.${field.scalaName.asSymbol}")
else if (field.isMap)
printer.add(s"val __${field.scalaName} = (scala.collection.immutable.Map.newBuilder[${field.mapType.keyType}, ${field.mapType.valueType}] ++= this.${field.scalaName.asSymbol})")
else
printer.add(s"val __${field.scalaName} = (scala.collection.immutable.Vector.newBuilder[${field.singleScalaTypeName}] ++= this.${field.scalaName.asSymbol})")
)
.print(message.getOneofs)((oneof, printer) =>
printer.add(s"var __${oneof.scalaName} = this.${oneof.scalaName.asSymbol}")
)
.addM(
s"""var _done__ = false
|while (!_done__) {
| val _tag__ = __input.readTag()
| _tag__ match {
| case 0 => _done__ = true""")
.print(message.fields) {
(field, printer) =>
if (!field.isPacked) {
val newValBase = if (field.isMessage) {
val defInstance = s"${field.getMessageType.scalaTypeName}.defaultInstance"
val baseInstance = if (field.isRepeated) defInstance else {
val expr = if (field.isInOneof)
fieldAccessorSymbol(field) else s"__${field.scalaName}"
val mappedType =
toBaseFieldType(field).apply(expr,
isCollection = !field.isSingular)
if (field.isInOneof || field.supportsPresence) (mappedType + s".getOrElse($defInstance)")
else mappedType
}
s"com.trueaccord.scalapb.LiteParser.readMessage(__input, $baseInstance)"
} else if (field.isEnum)
s"${field.getEnumType.scalaTypeName}.fromValue(__input.readEnum())"
else s"__input.read${Types.capitalizedType(field.getType)}()"
val newVal = toCustomType(field)(newValBase)
val updateOp =
if (field.supportsPresence) s"__${field.scalaName} = Some($newVal)"
else if (field.isInOneof) {
s"__${field.getContainingOneof.scalaName} = ${field.oneOfTypeName}($newVal)"
}
else if (field.isRepeated) s"__${field.scalaName} += $newVal"
else s"__${field.scalaName} = $newVal"
printer.addM(
s""" case ${(field.getNumber << 3) + Types.wireType(field.getType)} =>
| $updateOp""")
} else {
val read = {
val tmp = s"""__input.read${Types.capitalizedType(field.getType)}"""
if (field.isEnum)
s"${field.getEnumType.scalaTypeName}.fromValue($tmp)"
else tmp
}
val readExpr = toCustomType(field)(read)
printer.addM(
s""" case ${(field.getNumber << 3) + Types.WIRETYPE_LENGTH_DELIMITED} => {
| val length = __input.readRawVarint32()
| val oldLimit = __input.pushLimit(length)
| while (__input.getBytesUntilLimit > 0) {
| __${field.scalaName} += $readExpr
| }
| __input.popLimit(oldLimit)
| }""")
}
}
.addM(
s"""| case tag => __input.skipField(tag)
| }
|}""")
.add(s"$myFullScalaName(")
.indent.addWithDelimiter(",")(
(message.fieldsWithoutOneofs ++ message.getOneofs).map {
case e: FieldDescriptor if e.isRepeated =>
s" ${e.scalaName.asSymbol} = __${e.scalaName}.result()"
case e: FieldDescriptor =>
s" ${e.scalaName.asSymbol} = __${e.scalaName}"
case e: OneofDescriptor =>
s" ${e.scalaName.asSymbol} = __${e.scalaName}"
})
.outdent
.add(")")
.outdent
.add("}")
}
def generateToJavaProto(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val myFullScalaName = message.scalaTypeName
printer.add(s"def toJavaProto(scalaPbSource: $myFullScalaName): ${message.javaTypeName} = {")
.indent
.add(s"val javaPbOut = ${message.javaTypeName}.newBuilder")
.print(message.fields) {
case (field, printer) =>
printer.add(assignScalaFieldToJava("scalaPbSource", "javaPbOut", field))
}
.add("javaPbOut.build")
.outdent
.add("}")
}
def generateFromJavaProto(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val myFullScalaName = message.scalaTypeName
printer.add(s"def fromJavaProto(javaPbSource: ${message.javaTypeName}): $myFullScalaName = $myFullScalaName(")
.indent
.call {
printer =>
val normal = message.fields.collect {
case field if !field.isInOneof =>
val conversion = if (field.isMap) javaMapFieldToScala("javaPbSource", field)
else javaFieldToScala("javaPbSource", field)
Seq(s"${field.scalaName.asSymbol} = $conversion")
}
val oneOfs = message.getOneofs.map {
case oneOf =>
val javaEnumName = s"get${oneOf.upperScalaName}Case"
val head = s"${oneOf.scalaName.asSymbol} = javaPbSource.$javaEnumName.getNumber match {"
val body = oneOf.fields.map {
field =>
s" case ${field.getNumber} => ${field.oneOfTypeName}(${javaFieldToScala("javaPbSource", field)})"
}
val tail = Seq(s" case _ => ${oneOf.empty}", "}")
Seq(head) ++ body ++ tail
}
printer.addGroupsWithDelimiter(",")(normal ++ oneOfs)
}
.outdent
.add(")")
}
def generateFromFieldsMap(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
def transform(field: FieldDescriptor) =
(if (!field.isEnum) Identity else (
MethodApplication("getNumber") andThen
FunctionApplication(field.getEnumType.scalaTypeName + ".fromValue"))) andThen
toCustomTypeExpr(field)
val myFullScalaName = message.scalaTypeName
printer.add(s"def fromFieldsMap(__fieldsMap: Map[com.google.protobuf.Descriptors.FieldDescriptor, scala.Any]): $myFullScalaName = {")
.indent
.add("require(__fieldsMap.keys.forall(_.getContainingType() == descriptor), \"FieldDescriptor does not match message type.\")")
.add("val __fields = descriptor.getFields")
.add(myFullScalaName + "(")
.indent
.call {
printer =>
val fields = message.fields.collect {
case field if !field.isInOneof =>
val baseTypeName = field.typeCategory(if (field.isEnum) "com.google.protobuf.Descriptors.EnumValueDescriptor" else field.baseSingleScalaTypeName)
val e = if (field.supportsPresence)
s"__fieldsMap.get(__fields.get(${field.getIndex})).asInstanceOf[$baseTypeName]"
else if (field.isRepeated)
s"__fieldsMap.getOrElse(__fields.get(${field.getIndex}), Nil).asInstanceOf[$baseTypeName]"
else if (field.isRequired)
s"__fieldsMap(__fields.get(${field.getIndex})).asInstanceOf[$baseTypeName]"
else {
// This is for proto3, no default value.
val t = defaultValueForGet(field, uncustomized = true) + (if (field.isEnum)
".valueDescriptor" else "")
s"__fieldsMap.getOrElse(__fields.get(${field.getIndex}), $t).asInstanceOf[$baseTypeName]"
}
val s = transform(field).apply(e, isCollection = !field.isSingular)
if (field.isMap) s + "(scala.collection.breakOut)"
else s
}
val oneOfs = message.getOneofs.toSeq.map {
oneOf =>
val elems = oneOf.fields.map {
field =>
val typeName = if (field.isEnum) "com.google.protobuf.Descriptors.EnumValueDescriptor" else field.baseSingleScalaTypeName
val e = s"__fieldsMap.get(__fields.get(${field.getIndex})).asInstanceOf[Option[$typeName]]"
(transform(field) andThen FunctionApplication(field.oneOfTypeName)).apply(e, isCollection = true)
} mkString (" orElse\n")
s"${oneOf.scalaName.asSymbol} = $elems getOrElse ${oneOf.empty}"
}
printer.addWithDelimiter(",")(fields ++ oneOfs)
}
.outdent
.add(")")
.outdent
.add("}")
}
def generateDescriptor(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
printer
.when(message.isTopLevel)(_.add(s"def descriptor: com.google.protobuf.Descriptors.Descriptor = ${message.getFile.fileDescriptorObjectName}.descriptor.getMessageTypes.get(${message.getIndex})"))
.when(!message.isTopLevel)(_.add(s"def descriptor: com.google.protobuf.Descriptors.Descriptor = ${message.getContainingType.scalaTypeName}.descriptor.getNestedTypes.get(${message.getIndex})"))
}
def generateDefaultInstance(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val myFullScalaName = message.scalaTypeName
printer
.add(s"lazy val defaultInstance = $myFullScalaName(")
.indent
.addWithDelimiter(",")(message.fields.collect {
case field if field.isRequired =>
val default = defaultValueForDefaultInstance(field)
s"${field.scalaName.asSymbol} = $default"
})
.outdent
.add(")")
}
def generateMessageLens(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val className = message.scalaName
val classNameSymbol = className.asSymbol
def lensType(s: String) = s"com.trueaccord.lenses.Lens[UpperPB, $s]"
printer.add(
s"implicit class ${className}Lens[UpperPB](_l: com.trueaccord.lenses.Lens[UpperPB, $classNameSymbol]) extends com.trueaccord.lenses.ObjectLens[UpperPB, $classNameSymbol](_l) {")
.indent
.print(message.fields) {
case (field, printer) =>
val fieldName = field.scalaName.asSymbol
if (!field.isInOneof) {
if (field.supportsPresence) {
val optionLensName = "optional" + field.upperScalaName
printer
.addM(
s"""def $fieldName: ${lensType(field.singleScalaTypeName)} = field(_.${field.getMethod})((c_, f_) => c_.copy($fieldName = Some(f_)))
|def ${optionLensName}: ${lensType(field.scalaTypeName)} = field(_.$fieldName)((c_, f_) => c_.copy($fieldName = f_))""")
} else
printer.add(s"def $fieldName: ${lensType(field.scalaTypeName)} = field(_.$fieldName)((c_, f_) => c_.copy($fieldName = f_))")
} else {
val oneofName = field.getContainingOneof.scalaName.asSymbol
printer
.add(s"def $fieldName: ${lensType(field.scalaTypeName)} = field(_.${field.getMethod})((c_, f_) => c_.copy($oneofName = ${field.oneOfTypeName}(f_)))")
}
}
.print(message.getOneofs) {
case (oneof, printer) =>
val oneofName = oneof.scalaName.asSymbol
printer
.add(s"def $oneofName: ${lensType(oneof.scalaTypeName)} = field(_.$oneofName)((c_, f_) => c_.copy($oneofName = f_))")
}
.outdent
.add("}")
}
def generateFieldNumbers(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
printer
.print(message.fields) {
case (field, printer) =>
printer.add(s"final val ${field.fieldNumberConstantName} = ${field.getNumber}")
}
}
def generateTypeMappers(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val customizedFields: Seq[(FieldDescriptor, String)] = for {
field <- message.fields
custom <- field.customSingleScalaTypeName
} yield (field, custom)
printer
.print(customizedFields) {
case ((field, customType), printer) =>
printer.add(s"private val ${field.typeMapperValName}: com.trueaccord.scalapb.TypeMapper[${field.baseSingleScalaTypeName}, ${customType}] = implicitly[com.trueaccord.scalapb.TypeMapper[${field.baseSingleScalaTypeName}, ${customType}]]")
}
}
def generateTypeMappersForMapEntry(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val pairToMessage = if (message.mapType.valueField.supportsPresence)
s"__p => ${message.scalaTypeName}(__p._1, Some(__p._2))"
else
s"__p => ${message.scalaTypeName}(__p._1, __p._2)"
val messageToPair = if (message.mapType.valueField.supportsPresence)
s"__m => (__m.key, __m.getValue)"
else
s"__m => (__m.key, __m.value)"
printer
.addM(
s"""implicit val keyValueMapper: com.trueaccord.scalapb.TypeMapper[${message.scalaTypeName}, ${message.mapType.pairType}] =
| com.trueaccord.scalapb.TypeMapper[${message.scalaTypeName}, ${message.mapType.pairType}]($messageToPair)($pairToMessage)"""
)
}
def generateMessageCompanionForField(message: Descriptor)(fp: FunctionalPrinter): FunctionalPrinter = {
val signature = "def messageCompanionForField(__field: com.google.protobuf.Descriptors.FieldDescriptor): com.trueaccord.scalapb.GeneratedMessageCompanion[_] = "
// Due to https://issues.scala-lang.org/browse/SI-9111 we can't directly return the companion
// object.
if (message.fields.exists(_.isMessage))
fp.add(signature + "{")
.indent
.add("require(__field.getContainingType() == descriptor, \"FieldDescriptor does not match message type.\")")
.add("var __out: com.trueaccord.scalapb.GeneratedMessageCompanion[_] = null")
.add("__field.getNumber match {")
.indent
.print(message.fields.filter(_.isMessage)) {
case (f, fp) =>
fp.add(s"case ${f.getNumber} => __out = ${f.getMessageType.scalaTypeName}")
}
.outdent
.add("}")
.outdent
.add("__out")
.add("}")
else fp.add(signature + "throw new MatchError(__field)")
}
def generateEnumCompanionForField(message: Descriptor)(fp: FunctionalPrinter): FunctionalPrinter = {
val signature = "def enumCompanionForField(__field: com.google.protobuf.Descriptors.FieldDescriptor): com.trueaccord.scalapb.GeneratedEnumCompanion[_] = "
if (message.fields.exists(_.isEnum))
fp.add(signature + "{")
.indent
.add("require(__field.getContainingType() == descriptor, \"FieldDescriptor does not match message type.\")")
.add("__field.getNumber match {")
.indent
.print(message.fields.filter(_.isEnum)) {
case (f, fp) =>
fp.add(s"case ${f.getNumber} => ${f.getEnumType.scalaTypeName}")
}
.outdent
.add("}")
.outdent
.add("}")
else fp.add(signature + "throw new MatchError(__field)")
}
def generateMessageCompanion(message: Descriptor)(printer: FunctionalPrinter): FunctionalPrinter = {
val className = message.nameSymbol
val mixins = if (message.javaConversions)
s"with com.trueaccord.scalapb.JavaProtoSupport[$className, ${message.javaTypeName}] " else ""
val companionType = s"com.trueaccord.scalapb.GeneratedMessageCompanion[$className] $mixins"
printer.addM(
s"""object $className extends $companionType {
| implicit def messageCompanion: $companionType = this""")
.indent
.when(message.javaConversions)(generateToJavaProto(message))
.when(message.javaConversions)(generateFromJavaProto(message))
.call(generateFromFieldsMap(message))
.call(generateDescriptor(message))
.call(generateMessageCompanionForField(message))
.call(generateEnumCompanionForField(message))
.call(generateDefaultInstance(message))
.print(message.getEnumTypes)(printEnum)
.print(message.getOneofs)(printOneof)
.print(message.nestedTypes)(printMessage)
.call(generateMessageLens(message))
.call(generateFieldNumbers(message))
.when(!message.isMapEntry)(generateTypeMappers(message))
.when(message.isMapEntry)(generateTypeMappersForMapEntry(message))
.outdent
.add("}")
.add("")
}
def printMessage(message: Descriptor,
printer: FunctionalPrinter): FunctionalPrinter = {
printer
.add(s"@SerialVersionUID(0L)")
.add(s"final case class ${message.nameSymbol}(")
.indent
.indent
.call(printConstructorFieldList(message))
.add(s") extends ${message.baseClasses.mkString(" with ")} {")
.call(generateSerializedSizeForPackedFields(message))
.call(generateSerializedSize(message))
.call(generateWriteTo(message))
.call(generateMergeFrom(message))
.print(message.fields) {
case (field, printer) =>
val withMethod = "with" + field.upperScalaName
val clearMethod = "clear" + field.upperScalaName
val singleType = field.singleScalaTypeName
printer
.when(field.supportsPresence || field.isInOneof) {
p =>
val default = defaultValueForGet(field)
p.add(s"def ${field.getMethod}: ${field.singleScalaTypeName} = ${fieldAccessorSymbol(field)}.getOrElse($default)")
}
.when(field.supportsPresence) {
p =>
p.addM(
s"""def $clearMethod: ${message.nameSymbol} = copy(${field.scalaName.asSymbol} = None)
|def $withMethod(__v: ${singleType}): ${message.nameSymbol} = copy(${field.scalaName.asSymbol} = Some(__v))""")
}.when(field.isInOneof) {
p =>
p.add(
s"""def $withMethod(__v: ${singleType}): ${message.nameSymbol} = copy(${field.getContainingOneof.scalaName.asSymbol} = ${field.oneOfTypeName}(__v))""")
}.when(field.isRepeated) { p =>
val emptyValue = if (field.isMap) "Map.empty" else "Seq.empty"
p.addM(
s"""def $clearMethod = copy(${field.scalaName.asSymbol} = $emptyValue)
|def add${field.upperScalaName}(__vs: $singleType*): ${message.nameSymbol} = addAll${field.upperScalaName}(__vs)
|def addAll${field.upperScalaName}(__vs: TraversableOnce[$singleType]): ${message.nameSymbol} = copy(${field.scalaName.asSymbol} = ${field.scalaName.asSymbol} ++ __vs)""")
}.when(field.isRepeated || field.isSingular) {
_
.add(s"def $withMethod(__v: ${field.scalaTypeName}): ${message.nameSymbol} = copy(${field.scalaName.asSymbol} = __v)")
}
}.print(message.getOneofs) {
case (oneof, printer) =>
printer.addM(
s"""def clear${oneof.upperScalaName}: ${message.nameSymbol} = copy(${oneof.scalaName.asSymbol} = ${oneof.empty})
|def with${oneof.upperScalaName}(__v: ${oneof.scalaTypeName}): ${message.nameSymbol} = copy(${oneof.scalaName.asSymbol} = __v)""")
}
.call(generateGetField(message))
.add(s"override def toString: String = com.trueaccord.scalapb.TextFormat.printToUnicodeString(this)")
.add(s"def companion = ${message.scalaTypeName}")
.outdent
.outdent
.addM(s"""}
|""")
.call(generateMessageCompanion(message))
}
def generateInternalFields(message: Descriptor, fp: FunctionalPrinter): FunctionalPrinter = {
def makeDescriptor(field: FieldDescriptor): String = {
val index = field.getIndex
val label = if (field.isOptional) "Descriptors.Optional"
else if (field.isRepeated) "Descriptors.Repeated"
else if (field.isRequired) "Descriptors.Required"
else throw new IllegalArgumentException()
val t = field.getJavaType match {
case t if !field.isMessage && !field.isEnum =>
s"Descriptors.PrimitiveType(com.google.protobuf.Descriptors.FieldDescriptor.JavaType.$t, " +
s"com.google.protobuf.Descriptors.FieldDescriptor.Type.${field.getType})"
case _ if field.isMessage => "Descriptors.MessageType(" + field.getMessageType.scalaTypeName + ".descriptor)"
case _ if field.isEnum => "Descriptors.EnumType(" + field.getEnumType.scalaTypeName + ".descriptor)"
}
val oneof = field.containingOneOf.map(s => s"""Some("${s.getName()}")""").getOrElse("None")
s"""Descriptors.FieldDescriptor($index, ${field.getNumber}, "${field.getName}", $label, $t, isPacked = ${field.isPacked}, containingOneofName = $oneof)"""
}
fp.add(s"""case "${message.scalaTypeName}" => Seq(${message.fields.filterNot(_.isMap).map(makeDescriptor).mkString(", ")})""")
.print(message.nestedTypes)(generateInternalFields)
}
def scalaFileHeader(file: FileDescriptor): FunctionalPrinter = {
new FunctionalPrinter().addM(
s"""// Generated by the Scala Plugin for the Protocol Buffer Compiler.
|// Do not edit!
|//
|// Protofile syntax: ${file.getSyntax.toString}
|
|${if (file.scalaPackageName.nonEmpty) ("package " + file.scalaPackageName) else ""}
|
|${if (params.javaConversions) "import scala.collection.JavaConversions._" else ""}""")
.print(file.scalaOptions.getImportList) {
case (i, printer) => printer.add(s"import $i")
}
.add("")
}
def generateFileDescriptor(file: FileDescriptor)(fp: FunctionalPrinter): FunctionalPrinter = {
// Encoding the file descriptor proto in base64. JVM has a limit on string literal to be up
// to 64k, so we chunk it into a sequence and combining in run time. The chunks are less
// than 64k to account for indentation and new lines.
val clearProto = file.toProto.toBuilder.clearSourceCodeInfo.build
val base64: Seq[Seq[String]] = com.trueaccord.scalapb.Encoding.toBase64(clearProto.toByteArray)
.grouped(55000).map {
group =>
val lines = ("\"\"\"" + group).grouped(100).toSeq
lines.dropRight(1) :+ (lines.last + "\"\"\"")
}.toSeq
fp.add("lazy val descriptor: com.google.protobuf.Descriptors.FileDescriptor = {")
.add(" val proto = com.google.protobuf.DescriptorProtos.FileDescriptorProto.parseFrom(")
.add(" com.trueaccord.scalapb.Encoding.fromBase64(Seq(")
.addGroupsWithDelimiter(",")(base64)
.add(" ).mkString))")
.add(" com.google.protobuf.Descriptors.FileDescriptor.buildFrom(proto, Array(")
.addWithDelimiter(",")(file.getDependencies.map {
d =>
if (d.getPackage == "scalapb") "com.trueaccord.scalapb.Scalapb.getDescriptor()"
else d.fileDescriptorObjectFullName + ".descriptor"
})
.add(" ))")
.add("}")
}
private def encodeByteArray(a: GoogleByteString): Seq[String] = {
val CH_SLASH: java.lang.Byte = '\\'.toByte
val CH_SQ: java.lang.Byte = '\''.toByte
val CH_DQ: java.lang.Byte = '\"'.toByte
for {
groups <- a.grouped(60).toSeq
} yield {
val sb = scala.collection.mutable.StringBuilder.newBuilder
sb.append('\"')
groups.foreach {
b =>
b match {
case CH_SLASH => sb.append("\\\\")
case CH_SQ => sb.append("\\\'")
case CH_DQ => sb.append("\\\"")
case b if b >= 0x20 => sb.append(b)
case b =>
sb.append("\\u00")
sb.append(Integer.toHexString((b >>> 4) & 0xf))
sb.append(Integer.toHexString(b & 0xf))
}
}
sb.append('\"')
sb.result()
}
}
def generateScalaFilesForFileDescriptor(file: FileDescriptor): Seq[CodeGeneratorResponse.File] = {
val serviceFiles = if(params.grpc) {
file.getServices.map { service =>
val p = new GrpcServicePrinter(service, params)
val code = p.printService(FunctionalPrinter()).result()
val b = CodeGeneratorResponse.File.newBuilder()
b.setName(file.scalaPackageName.replace('.', '/') + "/" + service.objectName + ".scala")
b.setContent(code)
b.build
}
} else Nil
val enumFiles = for {
enum <- file.getEnumTypes
} yield {
val b = CodeGeneratorResponse.File.newBuilder()
b.setName(file.scalaPackageName.replace('.', '/') + "/" + enum.getName + ".scala")
b.setContent(
scalaFileHeader(file)