org.jetbrains.kotlin.js.inline.util.fixForwardNameReferences.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
import org.jetbrains.kotlin.js.backend.ast.*
fun JsNode.fixForwardNameReferences() {
accept(object : RecursiveJsVisitor() {
val currentScope = mutableMapOf()
init {
currentScope += collectDefinedNames(this@fixForwardNameReferences, skipLabelsAndCatches = true).associateBy { it.ident }
}
private fun restore(ident: String, oldName: JsName?) {
if (oldName == null) {
currentScope -= ident
} else {
currentScope[ident] = oldName
}
}
override fun visitFunction(x: JsFunction) {
val localVars = x.collectLocalVariables(skipLabelsAndCatches = true).toList()
val backup = arrayOfNulls(localVars.size)
localVars.forEachIndexed { index, localVar ->
backup[index] = currentScope[localVar.ident]
currentScope[localVar.ident] = localVar
}
super.visitFunction(x)
for (index in localVars.indices.reversed()) {
restore(localVars[index].ident, backup[index])
}
}
override fun visitCatch(x: JsCatch) {
val name = x.parameter.name
val oldName = currentScope[name.ident]
currentScope[name.ident] = name
super.visitCatch(x)
restore(name.ident, oldName)
}
override fun visitNameRef(nameRef: JsNameRef) {
super.visitNameRef(nameRef)
if (nameRef.qualifier == null) {
val ident = nameRef.ident
val name = currentScope[ident]
if (name != null) {
nameRef.name = name
}
}
}
override fun visitBreak(x: JsBreak) {}
override fun visitContinue(x: JsContinue) {}
})
}