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package sbt.util | |
import java.io.File | |
import java.nio.file.Path | |
import sjsonnew.{ Builder, JsonWriter } | |
import StringLongs.StringLong | |
trait PathHashWriters: | |
given stringLongLike[A](using conv: Conversion[A, StringLong]): HashWriter[A] with | |
def write[J](obj: A, builder: Builder[J]): Unit = | |
val ev = summon[HashWriter[StringLong]] | |
ev.write(conv(obj), builder) | |
end PathHashWriters | |
object PathHashWriters extends PathHashWriters | |
// Use opaque type to define HashWriter instance | |
object StringLongs: | |
opaque type StringLong = (String, Long) | |
object StringLong: | |
def apply(first: String, second: Long): StringLong = (first, second) | |
given Conversion[HashedVirtualFileRef, StringLong] = | |
(x: HashedVirtualFileRef) => StringLong(x.id, x.contentHash) | |
given Conversion[File, StringLong] = | |
(x: File) => StringLong(x.toString(), Hasher.farmHash(x.toPath())) | |
given Conversion[Path, StringLong] = | |
(x: Path) => StringLong(x.toString(), Hasher.farmHash(x)) | |
given HashWriter[StringLong] = new HashWriter[StringLong]: | |
def write[J](obj: StringLong, builder: Builder[J]): Unit = | |
builder.beginObject() | |
builder.addFieldName("first") | |
builder.writeString(obj._1) | |
builder.addFieldName("second") | |
builder.writeLong(obj._2) | |
builder.endObject() | |
end StringLongs |
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package sbt.util | |
import java.io.File | |
import verify.BasicTestSuite | |
object HasherTest extends BasicTestSuite: | |
lazy val hashProtocol = new ImplicitHashWriters() {} | |
import hashProtocol.* | |
test("The IntJsonFormat should convert an Int to an int hash") { | |
import sjsonnew.BasicJsonProtocol.given | |
val actual = Hasher.hashUnsafe[Int](1) | |
assert(actual == 1527037976) | |
} | |
test("StringLong hashing from the implicit scope") { | |
import StringLongs.StringLong | |
val x = StringLongs.StringLong("a.txt", 1) | |
val actual = Hasher.hashUnsafe(x) | |
assert(actual == -646160054) | |
} | |
test("HashedVirtualFileRef") { | |
import PathHashWriters.given | |
val x = HashedVirtualFileRef("a.txt", 1) | |
val actual = Hasher.hashUnsafe(x) | |
assert(actual == -646160054) | |
} | |
test("java.io.File hash using farmhash") { | |
import PathHashWriters.given | |
val x = File("LICENSE") | |
val actual = Hasher.hashUnsafe(x) | |
assert(actual == 1218007292) | |
} | |
end HasherTest |
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