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/*
* 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.generators.builtins.progressionIterators
import org.jetbrains.kotlin.generators.builtins.*
import org.jetbrains.kotlin.generators.builtins.generateBuiltIns.*
import org.jetbrains.kotlin.generators.builtins.ProgressionKind.*
import java.io.PrintWriter
fun integerProgressionIterator(kind: ProgressionKind): String {
val t = kind.capitalized
val incrementType = progressionIncrementType(kind)
val (toInt, toType) = when (kind) {
CHAR -> ".toInt()" to ".to$t()"
else -> "" to ""
}
return """/**
* An iterator over a progression of values of type `$t`.
* @property step the number by which the value is incremented on each step.
*/
internal class ${t}ProgressionIterator(first: $t, last: $t, val step: $incrementType) : ${t}Iterator() {
private val finalElement = last$toInt
private var hasNext: Boolean = if (step > 0) first <= last else first >= last
private var next = if (hasNext) first$toInt else finalElement
override fun hasNext(): Boolean = hasNext
override fun next$t(): $t {
val value = next
if (value == finalElement) {
if (!hasNext) throw kotlin.NoSuchElementException()
hasNext = false
}
else {
next += step
}
return value$toType
}
}"""
}
class GenerateProgressionIterators(out: PrintWriter) : BuiltInsSourceGenerator(out) {
override fun getPackage() = "kotlin.ranges"
override fun generateBody() {
for (kind in ProgressionKind.values()) {
out.println(integerProgressionIterator(kind))
out.println()
}
}
}
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