org.jetbrains.kotlin.utils.fileUtils.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.utils.fileUtils
import java.io.File
fun File.withReplacedExtensionOrNull(oldExt: String, newExt: String): File? {
if (name.endsWith(oldExt)) {
val path = path
val pathWithoutExt = path.substring(0, path.length - oldExt.length)
val pathWithNewExt = pathWithoutExt + newExt
return File(pathWithNewExt)
}
return null
}
/**
* Calculates the relative path to this file from [base] file.
* Note that the [base] file is treated as a directory.
*
* If this file matches the [base] directory an empty path is returned.
* If this file does not belong to the [base] directory, it is returned unchanged.
*/
fun File.descendantRelativeTo(base: File): File {
val prefix = base.canonicalPath
val answer = this.canonicalPath
return if (answer.startsWith(prefix)) {
val prefixSize = prefix.length
if (answer.length > prefixSize) {
File(answer.substring(prefixSize + 1))
} else File("")
} else {
this
}
}