org.jetbrains.kotlin.js.inline.util.rewriters.LabelNameRefreshingVisitor.kt Maven / Gradle / Ivy
/*
* Copyright 2010-2017 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.js.inline.util.rewriters
import org.jetbrains.kotlin.js.backend.ast.*
import java.util.*
class LabelNameRefreshingVisitor(val functionScope: JsFunctionScope) : JsVisitorWithContextImpl() {
private val substitutions: MutableMap> = mutableMapOf()
override fun visit(x: JsFunction, ctx: JsContext): Boolean = false
override fun endVisit(x: JsBreak, ctx: JsContext) {
val label = x.label?.name
if (label != null) {
ctx.replaceMe(JsBreak(getSubstitution(label).makeRef()).source(x.source))
}
super.endVisit(x, ctx)
}
override fun endVisit(x: JsContinue, ctx: JsContext) {
val label = x.label?.name
if (label != null) {
ctx.replaceMe(JsContinue(getSubstitution(label).makeRef()).source(x.source))
}
super.endVisit(x, ctx)
}
override fun visit(x: JsLabel, ctx: JsContext): Boolean {
val labelName = x.name
val freshName = functionScope.enterLabel(labelName.ident, labelName.ident)
substitutions.getOrPut(labelName) { ArrayDeque() }.push(freshName)
return super.visit(x, ctx)
}
override fun endVisit(x: JsLabel, ctx: JsContext) {
val labelName = x.name
val stack = substitutions[labelName]!!
val replacementLabel = JsLabel(stack.pop(), x.statement).apply { copyMetadataFrom(x) }
ctx.replaceMe(replacementLabel)
functionScope.exitLabel()
super.endVisit(x, ctx)
}
private fun getSubstitution(name: JsName) = substitutions[name]?.peek() ?: name
}