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[WIP] issue-38 fix proposal #39

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[WIP] issue-38 fix proposal #39

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12 changes: 10 additions & 2 deletions optics/shared/src/main/scala/pl/msitko/xml/optics/ElementOptics.scala
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Original file line number Diff line number Diff line change
@@ -1,10 +1,9 @@
package pl.msitko.xml.optics

import monocle.function.Index
import monocle.{Lens, Optional, Traversal}
import monocle.{Lens, Optional, Prism, Traversal}
import pl.msitko.xml.entities._
import pl.msitko.xml.matchers.NameMatcher

import scalaz.Applicative
import scalaz.std.list._
import scalaz.syntax.traverse._
Expand All @@ -23,6 +22,15 @@ trait ElementOptics {
def deeper(label: String): Traversal[Element, Element] =
deeper(NameMatcher.fromString(label))

def being(predicate: Element => Boolean): Prism[Element, Element] =
Prism[Element, Element]{ el =>
if (predicate(el)) {
Some(el)
} else {
None
}
}(identity)

val hasOneChild: Optional[Element, Node] = Optional[Element, Node]{ el =>
onlyChild(el)
}{ newNode => from =>
Expand Down