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import org.scalacheck._, Prop._, Gen._, Arbitrary._
import scala.reflect.runtime.universe._, Flag._, internal.reificationSupport._
object TypecheckedProps extends QuasiquoteProperties("typechecked") {
def original(tree: Tree) = tree match {
case tt: TypeTree => Some(tt.original)
case _ => None
}
def originals(trees: List[Tree]) = trees.flatMap(original)
val int = ScalaDot(TypeName("Int"))
val intint = List(int, int)
property("tuple term") = test {
val q"(..$elements)" = typecheck(q"(1, 2)")
assert(elements ≈ List(q"1", q"2"))
}
property("tuple type") = test {
val tq"(..$els0)" = typecheckTyp(tq"Unit")
assert(els0.isEmpty)
val tq"(..$els1)" = typecheckTyp(tq"(Int, Int)")
assert(originals(els1) ≈ intint)
}
property("function type") = test {
val tq"(..$argtpes) => $restpe" = typecheckTyp(tq"(Int, Int) => Int")
assert(originals(argtpes) ≈ intint)
assert(original(restpe).get ≈ int)
}
property("for/for-yield") = test {
val enums = fq"x <- xs" :: fq"x1 = x + 1" :: fq"if x1 % 2 == 0" :: Nil
val body = q"x1"
val xs = q"val xs = List(1, 2, 3)"
val q"$_; for(..$enums0) yield $body0" = typecheck(q"$xs; for(..$enums) yield $body")
assert(enums0 ≈ enums)
assert(body0 ≈ body)
val q"$_; for(..$enums1) $body1" = typecheck(q"$xs; for(..$enums) $body")
assert(enums1 ≈ enums)
assert(body1 ≈ body)
}
property("for .filter instead of .withFilter") = test {
val enums = fq"foo <- new Foo" :: fq"if foo != null" :: Nil
val body = q"foo"
val q"$_; for(..$enums1) yield $body1" = typecheck(q"""
class Foo { def map(f: Any => Any) = this; def withFilter(cond: Any => Boolean) = this }
for(..$enums) yield $body
""")
assert(enums1 ≈ enums)
assert(body1 ≈ body)
}
property("extract UnApply (1)") = test {
val q"object $_ { $_; $_; $m }" = typecheck(q"""
object Test {
class Cell(val x: Int)
object Cell { def unapply(c: Cell) = Some(c.x) }
new Cell(0) match { case Cell(v) => v }
}
""")
val q"$_ match { case $f(..$args) => $_ }" = m
assert(f ≈ pq"Test.this.Cell")
assert(args ≈ List(pq"v"))
}
property("extract UnApply (2)") = test {
val q"object $_ { $_; $m }" = typecheck(q"""
object Test {
case class Cell(val x: Int)
new Cell(0) match { case Cell(v) => v }
}
""")
val q"$_ match { case ${f: TypeTree}(..$args) => $_ }" = m
assert(f.original ≈ pq"Test.this.Cell")
assert(args ≈ List(pq"v"))
}
property("extract inferred val type") = test {
val typechecked = typecheck(q"val x = 42")
val q"val x = 42" = typechecked
val q"val x: ${tq""} = 42" = typechecked
val q"val x: ${t: Type} = 42" = typechecked
}
property("class with param (1)") = test {
val paramName = TermName("x")
val q"class $_($param)" = typecheck(q"class Test(val $paramName: Int)")
assert(param.name == paramName)
}
property("class with param (2)") = test {
val paramName = TermName("y")
val q"{class $_($param)}" = typecheck(q"class Test(val $paramName: Int = 3)")
assert(param.name == paramName)
assert(param.rhs ≈ q"3")
}
property("class with params") = test {
val pName1 = TermName("x1")
val pName2 = TermName("x2")
val q"{class $_($param1)(..$params2)}" = typecheck(q"class Test(val x0: Float)(val $pName1: Int = 3, $pName2: String)")
val List(p1, p2, _*) = params2
assert(p1.name == pName1)
assert(p2.name == pName2)
assert(params2.size == 2)
}
property("implicit class") = test {
val clName = TypeName("Test")
val paramName = TermName("x")
val q"{implicit class $name($param)}" = typecheck(q"implicit class $clName(val $paramName: String)")
assert(name == clName)
assert(param.name == paramName)
}
property("block with lazy") = test {
val lazyName = TermName("x")
val lazyRhsVal = 42
val lazyRhs = Literal(Constant(lazyRhsVal))
val q"{lazy val $pname = $rhs}" = typecheck(q"{lazy val $lazyName = $lazyRhsVal}")
assert(pname == lazyName)
assert(rhs ≈ lazyRhs)
}
property("class with lazy") = test {
val clName = TypeName("Test")
val paramName = TermName("x")
val q"class $name{lazy val $pname = $_}" = typecheck(q"class $clName {lazy val $paramName = 42}")
assert(name == clName)
assert(pname == paramName)
}
property("case class with object") = test {
val defName = TermName("z")
val defRhsVal = 42
val defRhs = Literal(Constant(defRhsVal))
val q"object $_{ $_; object $_ extends ..$_ {def $name = $rhs} }" =
typecheck(q"""
object Test{
case class C(x: Int) { def y = x };
object C { def $defName = $defRhsVal }
}""")
assert(name == defName)
assert(rhs ≈ defRhs)
}
property("partial function") = test {
val q"{ case ..$cases }: $ascr" = typecheck(q"{ case 1 => () }: PartialFunction[Int, Unit]")
assert(cases ≈ q"{ case 1 => () }".cases)
}
}
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