org.jetbrains.kotlin.js.inline.util.functionUtils.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.js.inline.util
import org.jetbrains.kotlin.js.backend.ast.JsFunction
import org.jetbrains.kotlin.js.backend.ast.JsReturn
fun isFunctionCreator(outer: JsFunction): Boolean =
outer.getInnerFunction() != null
/**
* Gets inner function from function, that creates closure
*
* For example:
* function(a) {
* return function() { return a; }
* }
*
* Inner functions can only be generated when lambda
* with closure is created
*/
fun JsFunction.getInnerFunction(): JsFunction? {
val statements = body.statements
if (statements.size != 1) return null
val statement = statements.get(0)
val returnExpr = (statement as? JsReturn)?.expression
return returnExpr as? JsFunction
}