.kotlin.kotlin-compiler.1.3.11.source-code.PsiChildRange.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.psi.psiUtil
import com.intellij.psi.PsiElement
data class PsiChildRange(val first: PsiElement?, val last: PsiElement?) : Sequence {
init {
if (first == null) {
assert(last == null)
} else {
assert(first.parent == last!!.parent)
}
}
val isEmpty: Boolean
get() = first == null
override fun iterator(): Iterator {
val sequence = if (first == null) {
emptySequence()
} else {
val afterLast = last!!.nextSibling
first.siblings().takeWhile { it != afterLast }
}
return sequence.iterator()
}
companion object {
val EMPTY: PsiChildRange = PsiChildRange(null, null)
fun singleElement(element: PsiElement): PsiChildRange = PsiChildRange(element, element)
}
}