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Expr.scala
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Expr.scala
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package scala.quoted
/** Quoted expression of type `T`.
*
* `Expr` has extension methods that are defined in `scala.quoted.Quotes`.
*/
abstract class Expr[+T] private[scala] ()
/** Constructors for expressions */
object Expr {
/** `e.betaReduce` returns an expression that is functionally equivalent to `e`,
* however if `e` is of the form `((y1, ..., yn) => e2)(e1, ..., en)`
* then it optimizes this the top most call by returning the result of beta-reducing the application.
* Otherwise returns `expr`.
*
* To retain semantics the argument `ei` is bound as `val yi = ei` and by-name arguments to `def yi = ei`.
* Some bindings may be elided as an early optimization.
*/
def betaReduce[T](expr: Expr[T])(using Quotes): Expr[T] =
import quotes.reflect.*
Term.betaReduce(expr.asTerm) match
case Some(expr1) => expr1.asExpr.asInstanceOf[Expr[T]]
case _ => expr
/** Returns an expression containing a block with the given statements and ending with the expression
* Given list of statements `s1 :: s2 :: ... :: Nil` and an expression `e` the resulting expression
* will be equivalent to `'{ $s1; $s2; ...; $e }`.
*/
def block[T](statements: List[Expr[Any]], expr: Expr[T])(using Quotes): Expr[T] = {
import quotes.reflect.*
Block(statements.map(asTerm), expr.asTerm).asExpr.asInstanceOf[Expr[T]]
}
/** Creates an expression that will construct the value `x` */
def apply[T](x: T)(using ToExpr[T])(using Quotes): Expr[T] =
scala.Predef.summon[ToExpr[T]].apply(x)
/** Get `Some` of a copy of the value if the expression contains a literal constant or constructor of `T`.
* Otherwise returns `None`.
*
* Usage:
* ```scala sc:nocompile
* case '{ ... ${expr @ Expr(value)}: T ...} =>
* // expr: Expr[T]
* // value: T
* ```
*
* To directly get the value of an expression `expr: Expr[T]` consider using `expr.value`/`expr.valueOrError` instead.
*/
def unapply[T](x: Expr[T])(using FromExpr[T])(using Quotes): Option[T] =
scala.Predef.summon[FromExpr[T]].unapply(x)
/** Creates an expression that will construct a copy of this sequence
*
* Transforms a sequence of expression
* `Seq(e1, e2, ...)` where `ei: Expr[T]`
* to an expression equivalent to
* `'{ Seq($e1, $e2, ...) }` typed as an `Expr[Seq[T]]`
*/
def ofSeq[T](xs: Seq[Expr[T]])(using Type[T])(using Quotes): Expr[Seq[T]] =
Varargs(xs)
/** Creates an expression that will construct a copy of this list
*
* Transforms a list of expression
* `List(e1, e2, ...)` where `ei: Expr[T]`
* to an expression equivalent to
* `'{ List($e1, $e2, ...) }` typed as an `Expr[List[T]]`
*/
def ofList[T](xs: Seq[Expr[T]])(using Type[T])(using Quotes): Expr[List[T]] =
if xs.isEmpty then Expr(Nil) else '{ List(${Varargs(xs)}*) }
/** Creates an expression that will construct a copy of this tuple
*
* Transforms a sequence of expression
* `Seq(e1, e2, ...)` where `ei: Expr[Any]`
* to an expression equivalent to
* `'{ ($e1, $e2, ...) }` typed as an `Expr[Tuple]`
*/
def ofTupleFromSeq(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] = {
seq.size match {
case 0 => '{ Tuple() }
case 1 => ofTupleFromSeq1(seq)
case 2 => ofTupleFromSeq2(seq)
case 3 => ofTupleFromSeq3(seq)
case 4 => ofTupleFromSeq4(seq)
case 5 => ofTupleFromSeq5(seq)
case 6 => ofTupleFromSeq6(seq)
case 7 => ofTupleFromSeq7(seq)
case 8 => ofTupleFromSeq8(seq)
case 9 => ofTupleFromSeq9(seq)
case 10 => ofTupleFromSeq10(seq)
case 11 => ofTupleFromSeq11(seq)
case 12 => ofTupleFromSeq12(seq)
case 13 => ofTupleFromSeq13(seq)
case 14 => ofTupleFromSeq14(seq)
case 15 => ofTupleFromSeq15(seq)
case 16 => ofTupleFromSeq16(seq)
case 17 => ofTupleFromSeq17(seq)
case 18 => ofTupleFromSeq18(seq)
case 19 => ofTupleFromSeq19(seq)
case 20 => ofTupleFromSeq20(seq)
case 21 => ofTupleFromSeq21(seq)
case 22 => ofTupleFromSeq22(seq)
case _ => ofTupleFromSeqXXL(seq)
}
}
private def ofTupleFromSeq1(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }) => '{ Tuple1($x1) }
private def ofTupleFromSeq2(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }) => '{ Tuple2($x1, $x2) }
private def ofTupleFromSeq3(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }) => '{ Tuple3($x1, $x2, $x3) }
private def ofTupleFromSeq4(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }) =>
'{ Tuple4($x1, $x2, $x3, $x4) }
private def ofTupleFromSeq5(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }) =>
'{ Tuple5($x1, $x2, $x3, $x4, $x5) }
private def ofTupleFromSeq6(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }) =>
'{ Tuple6($x1, $x2, $x3, $x4, $x5, $x6) }
private def ofTupleFromSeq7(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }) =>
'{ Tuple7($x1, $x2, $x3, $x4, $x5, $x6, $x7) }
private def ofTupleFromSeq8(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }) =>
'{ Tuple8($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8) }
private def ofTupleFromSeq9(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }) =>
'{ Tuple9($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9) }
private def ofTupleFromSeq10(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }) =>
'{ Tuple10($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10) }
private def ofTupleFromSeq11(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }) =>
'{ Tuple11($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11) }
private def ofTupleFromSeq12(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }) =>
'{ Tuple12($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12) }
private def ofTupleFromSeq13(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }) =>
'{ Tuple13($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13) }
private def ofTupleFromSeq14(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }) =>
'{ Tuple14($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14) }
private def ofTupleFromSeq15(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }, '{ $x15: t15 }) =>
'{ Tuple15($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15) }
private def ofTupleFromSeq16(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }, '{ $x15: t15 }, '{ $x16: t16 }) =>
'{ Tuple16($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16) }
private def ofTupleFromSeq17(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }, '{ $x15: t15 }, '{ $x16: t16 }, '{ $x17: t17 }) =>
'{ Tuple17($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17) }
private def ofTupleFromSeq18(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }, '{ $x15: t15 }, '{ $x16: t16 }, '{ $x17: t17 }, '{ $x18: t18 }) =>
'{ Tuple18($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18) }
private def ofTupleFromSeq19(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }, '{ $x15: t15 }, '{ $x16: t16 }, '{ $x17: t17 }, '{ $x18: t18 }, '{ $x19: t19 }) =>
'{ Tuple19($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18, $x19) }
private def ofTupleFromSeq20(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }, '{ $x15: t15 }, '{ $x16: t16 }, '{ $x17: t17 }, '{ $x18: t18 }, '{ $x19: t19 }, '{ $x20: t20 }) =>
'{ Tuple20($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18, $x19, $x20) }
private def ofTupleFromSeq21(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }, '{ $x15: t15 }, '{ $x16: t16 }, '{ $x17: t17 }, '{ $x18: t18 }, '{ $x19: t19 }, '{ $x20: t20 }, '{ $x21: t21 }) =>
'{ Tuple21($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18, $x19, $x20, $x21) }
private def ofTupleFromSeq22(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
seq match
case Seq('{ $x1: t1 }, '{ $x2: t2 }, '{ $x3: t3 }, '{ $x4: t4 }, '{ $x5: t5 }, '{ $x6: t6 }, '{ $x7: t7 }, '{ $x8: t8 }, '{ $x9: t9 }, '{ $x10: t10 }, '{ $x11: t11 }, '{ $x12: t12 }, '{ $x13: t13 }, '{ $x14: t14 }, '{ $x15: t15 }, '{ $x16: t16 }, '{ $x17: t17 }, '{ $x18: t18 }, '{ $x19: t19 }, '{ $x20: t20 }, '{ $x21: t21 }, '{ $x22: t22 }) =>
'{ Tuple22($x1, $x2, $x3, $x4, $x5, $x6, $x7, $x8, $x9, $x10, $x11, $x12, $x13, $x14, $x15, $x16, $x17, $x18, $x19, $x20, $x21, $x22) }
private def ofTupleFromSeqXXL(seq: Seq[Expr[Any]])(using Quotes): Expr[Tuple] =
val tupleTpe = tupleTypeFromSeq(seq)
tupleTpe.asType match
case '[tpe] =>
'{ Tuple.fromIArray(IArray(${Varargs(seq)}*)).asInstanceOf[tpe & Tuple] }
private def tupleTypeFromSeq(seq: Seq[Expr[Any]])(using Quotes): quotes.reflect.TypeRepr =
import quotes.reflect.*
val consRef = Symbol.classSymbol("scala.*:").typeRef
seq.foldLeft(TypeRepr.of[EmptyTuple]) { (ts, expr) =>
AppliedType(consRef, expr.asTerm.tpe :: ts :: Nil)
}
/** Given a tuple of the form `(Expr[A1], ..., Expr[An])`, outputs a tuple `Expr[(A1, ..., An)]`. */
def ofTuple[T <: Tuple: Tuple.IsMappedBy[Expr]: Type](tup: T)(using Quotes): Expr[Tuple.InverseMap[T, Expr]] = {
val elems: Seq[Expr[Any]] = tup.asInstanceOf[Product].productIterator.toSeq.asInstanceOf[Seq[Expr[Any]]]
ofTupleFromSeq(elems).asExprOf[Tuple.InverseMap[T, Expr]]
}
/** Find a given instance of type `T` in the current scope.
* Return `Some` containing the expression of the implicit or
* `None` if implicit resolution failed.
*
* @tparam T type of the implicit parameter
*/
def summon[T](using Type[T])(using Quotes): Option[Expr[T]] = {
import quotes.reflect.*
Implicits.search(TypeRepr.of[T]) match {
case iss: ImplicitSearchSuccess => Some(iss.tree.asExpr.asInstanceOf[Expr[T]])
case isf: ImplicitSearchFailure => None
}
}
}