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package com.github.jodersky.mavlink
package trees {
sealed trait Tree
case class Dialect(version: String, enums: Set[Enum], messages: Set[Message]) extends Tree
case class Enum(name: String, entries: Set[EnumEntry]) extends Tree
case class EnumEntry(value: Int, name: String, description: String) extends Tree
case class Field(tpe: Type, nativeType: String, name: String, enum: Option[String], description: String) extends Tree
case class Message(id: Byte, name: String, description: String, fields: Seq[Field]) extends Tree {
def orderedFields = fields.toSeq.sortBy(_.tpe.width)(Ordering[Int].reverse)
def length = fields.map(_.tpe.sizeof).sum
lazy val checksum = {
var c = new Crc()
c = c.accumulate((name + " ").getBytes)
for (field <- orderedFields) {
c = c.accumulate((field.nativeType + " ").getBytes)
c = c.accumulate((field.name + " ").getBytes)
}
(c.lsb ^ c.msb).toByte
}
}
trait Type extends Tree {
def width: Int // width in bytes of the type
def sizeof: Int = width // size of bytes of the type
}
case class IntType(width: Int, signed: Boolean) extends Type
case class FloatType(width: Int) extends Type
case class ArrayType(underlying: Type, length: Int) extends Type {
def width = underlying.width
override def sizeof = width * length
}
case object CharType extends Type {
def width = 1
}
case class StringType(maxLength: Int) extends Type {
val width = 1
override def sizeof = width * maxLength
}
}
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