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Yield.scala
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Yield.scala
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package com.thoughtworks.dsl
package keywords
import Dsl.IsKeyword
import scala.collection._
import scala.language.implicitConversions
import com.thoughtworks.dsl.Dsl
import com.thoughtworks.dsl.keywords.Yield.From
import scala.collection._
import scala.collection.generic.CanBuildFrom
import scala.concurrent.Future
import scala.language.implicitConversions
import scala.language.higherKinds
/** @author
* 杨博 (Yang Bo)
* @example
* This `Yield` keyword must be put inside a function that returns
* `Seq[Element]` or `Seq[Element] !! ...`, or it will not compile.
*
* {{{
* import com.thoughtworks.dsl.macros.Reset.Default.*
* "def f(): Int = !Yield(1)" shouldNot compile
* }}}
*
* @example
* [[Yield]] keywords can be used together with other keywords.
* {{{
* import com.thoughtworks.dsl.macros.Reset.Default.*
* def gccFlagBuilder(sourceFile: String, includes: String*) = reset[Stream[String]] {
* !Yield("gcc")
* !Yield("-c")
* !Yield(sourceFile)
* val include = !Each(includes)
* !Yield("-I")
* !Yield(include)
* Stream.empty
* }
*
* gccFlagBuilder("main.c", "lib1/include", "lib2/include") should be(Stream("gcc", "-c", "main.c", "-I", "lib1/include", "-I", "lib2/include"))
* }}}
* @see
* [[comprehension]] if you want to use traditional `for` comprehension
* instead of !-notation.
*/
opaque type Yield[+Element] <: Dsl.Keyword.Opaque =
Dsl.Keyword.Opaque.Of[Element]
def Yield[Element](using
dummyImplicit: DummyImplicit = DummyImplicit.dummyImplicit
): Element =:= Yield[Element] = Dsl.Keyword.Opaque.Of
private[keywords] trait LowPriorityYield3 {
def apply[A](elements: A*) = {
From(elements)
}
given [A, FromCollection <: TraversableOnce[A]]
: Dsl.Original[From[FromCollection], Iterator[A], Unit] =
Dsl.Original[From[FromCollection], Iterator[A], Unit] {
(keyword: From[FromCollection], generateTail: Unit => Iterator[A]) =>
From.flip(keyword).toIterator ++ generateTail(())
}
given [A, B >: A]: Dsl.Original[Yield[A], Iterator[B], Unit] =
Dsl.Original[Yield[A], Iterator[B], Unit] {
(keyword: Yield[A], generateTail: Unit => Iterator[B]) =>
Iterator.single(Yield.flip(keyword)) ++ generateTail(())
}
}
private[keywords] trait LowPriorityYield1 extends LowPriorityYield3 {
given [A, FromCollection <: View.SomeIterableOps[A], Collection[X] <: SeqOps[
X,
Collection,
Collection[X]
]]: Dsl.Original[From[FromCollection], Collection[A], Unit] =
Dsl.Original[From[FromCollection], Collection[A], Unit] {
(keyword: From[FromCollection], generateTail: Unit => Collection[A]) =>
From.flip(keyword).toIterable ++: generateTail(())
}
given [A, B >: A, Collection[+X] <: SeqOps[X, Collection, Collection[X]]]
: Dsl.Original[Yield[A], Collection[B], Unit] =
Dsl.Original[Yield[A], Collection[B], Unit] {
(keyword: Yield[A], generateTail: Unit => Collection[B]) =>
Yield.flip(keyword) +: generateTail(())
}
}
private[keywords] trait LowPriorityYield0 extends LowPriorityYield1
object Yield extends LowPriorityYield0 {
given [Element]: IsKeyword[Yield[Element], Unit] with {}
def apply[A](element0: A, element1: A, elements: A*) = {
From(element0 +: element1 +: elements)
}
opaque type From[FromCollection <: TraversableOnce[_]] <: Dsl.Keyword.Opaque =
Dsl.Keyword.Opaque.Of[FromCollection]
private[Yield] trait LowPriorityFrom0 { this: From.type =>
given [A, FromSomeIterableOps <: View.SomeIterableOps[A]]
: Dsl.Original[From[FromSomeIterableOps], SeqView[A], Unit] =
Dsl.Original[From[FromSomeIterableOps], SeqView[A], Unit] {
(
keyword: From[FromSomeIterableOps],
generateTail: Unit => SeqView[A]
) =>
new SeqView.Concat(collection.Seq.from(keyword), generateTail(()))
}
given [A, FromSomeIterableOps <: View.SomeIterableOps[A]]
: Dsl.Original[From[FromSomeIterableOps], IndexedSeqView[A], Unit] =
Dsl.Original[From[FromSomeIterableOps], IndexedSeqView[A], Unit] {
(
keyword: From[FromSomeIterableOps],
generateTail: Unit => IndexedSeqView[A]
) =>
new IndexedSeqView.Concat(
collection.IndexedSeq.from(keyword),
generateTail(())
)
}
}
def From[FromCollection <: TraversableOnce[_]](using
dummyImplicit: DummyImplicit = DummyImplicit.dummyImplicit
): FromCollection =:= From[FromCollection] = Dsl.Keyword.Opaque.Of
object From extends LowPriorityFrom0 {
given [FromCollection <: TraversableOnce[_]]
: IsKeyword[From[FromCollection], Unit] with {}
extension [A, E](inline a: A)(using
inline notKeyword: util.NotGiven[
A <:< Dsl.Keyword
],
inline isIterable: A <:< Iterable[E]
)
transparent inline def unary_! : Unit =
!From[Iterable[E]](isIterable(a))
given [A, FromCollection <: View.SomeIterableOps[A]]
: Dsl.Original[From[FromCollection], View[A], Unit] =
Dsl.Original[From[FromCollection], View[A], Unit] {
(keyword: From[FromCollection], generateTail: Unit => View[A]) =>
new View.Concat(keyword, generateTail(()))
}
given indexedSeqViewYieldFromDsl[A, FromIndexedSeqOps <: IndexedSeqOps[
A,
CC,
C
], CC[_], C]
: Dsl.Original[From[FromIndexedSeqOps], IndexedSeqView[A], Unit] =
Dsl.Original[From[FromIndexedSeqOps], IndexedSeqView[A], Unit] {
(
keyword: From[FromIndexedSeqOps],
generateTail: Unit => IndexedSeqView[A]
) =>
new IndexedSeqView.Concat(keyword, generateTail(()))
}
given seqViewYieldFromDsl[A, FromCollection <: SeqOps[A, CC, C], CC[_], C]
: Dsl.Original[From[FromCollection], SeqView[A], Unit] =
Dsl.Original[From[FromCollection], SeqView[A], Unit] {
(keyword: From[FromCollection], generateTail: Unit => SeqView[A]) =>
new SeqView.Concat(keyword, generateTail(()))
}
given [A, FromIterable <: Iterable[A]]
: Dsl.Original[From[FromIterable], LazyList[A], Unit] =
Dsl.Original[From[FromIterable], LazyList[A], Unit] {
(keyword: From[FromIterable], generateTail: Unit => LazyList[A]) =>
keyword.to(LazyList) #::: generateTail(())
}
given [A, FromIterable <: Iterable[A]]
: Dsl.Original[From[FromIterable], Stream[A], Unit] =
Dsl.Original[From[FromIterable], Stream[A], Unit] {
(keyword: From[FromIterable], generateTail: Unit => Stream[A]) =>
keyword.toStream #::: generateTail(())
}
}
given [A, B >: A]: Dsl.Original[Yield[A], SeqView[B], Unit] =
Dsl.Original[Yield[A], SeqView[B], Unit] {
(keyword: Yield[A], generateTail: Unit => SeqView[B]) =>
generateTail(()).prepended(keyword)
}
given [A, B >: A]: Dsl.Original[Yield[A], IndexedSeqView[B], Unit] =
Dsl.Original[Yield[A], IndexedSeqView[B], Unit] {
(keyword: Yield[A], generateTail: Unit => IndexedSeqView[B]) =>
generateTail(()).prepended(keyword)
}
given [A, B >: A]: Dsl.Original[Yield[A], View[B], Unit] =
Dsl.Original[Yield[A], View[B], Unit] {
(keyword: Yield[A], generateTail: Unit => View[B]) =>
new View.Concat[B](new View.Single(keyword), generateTail(()))
}
given [Element, That >: Element]
: Dsl.Original[Yield[Element], LazyList[That], Unit] =
Dsl.Original[Yield[Element], LazyList[That], Unit] {
(keyword: Yield[Element], generateTail: Unit => LazyList[That]) =>
keyword #:: generateTail(())
}
extension [A](inline a: A)(using
inline notKeyword: util.NotGiven[
A <:< Dsl.Keyword
]
)
transparent inline def unary_! : Unit =
!Yield[A](a)
implicit def streamYieldDsl[Element, That >: Element]
: Dsl.Original[Yield[Element], Stream[That], Unit] =
Dsl.Original[Yield[Element], Stream[That], Unit] {
(keyword: Yield[Element], generateTail: Unit => Stream[That]) =>
keyword #:: generateTail(())
}
}