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package io
sealed class Path {
abstract val parts: List<String>
fun toAbsolutePath(relativeTo: Absolute): Absolute {
return relativeTo.resolve(this)
}
abstract fun resolve(path: Path): Path
abstract val stringPath: String
companion object {
val root = Absolute(listOf())
fun ofShell(string: String, userHome: Absolute): Path =
ofShell(string.split("/"), userHome)
fun ofShell(vararg parts: String, userHome: Absolute): Path =
ofShell(parts.toList(), userHome)
fun of(vararg parts: String): Path =
of(parts.toList())
fun of(string: String): Path =
of(string.split("/"))
fun ofShell(parts: List<String>, userHome: Absolute): Path {
if (parts.firstOrNull() == "~")
return userHome.resolve(Relative(parts.subList(1, parts.size).filter { it.isNotEmpty() }))
return of(parts)
}
fun of(parts: List<String>): Path {
if (parts.isEmpty())
return root
if (parts[0] == "") // Starts with a /
return Absolute(parts.subList(1, parts.size).filter { it.isNotEmpty() })
return Relative(parts.filter { it.isNotEmpty() })
}
}
data class Relative internal constructor(override val parts: List<String>) : Path() {
override fun resolve(path: Path): Path {
if (path is Absolute) return path
return Relative(this.parts + path.parts)
}
override val stringPath: String get() = parts.joinToString("/")
}
data class Absolute internal constructor(override val parts: List<String>) : Path() {
override fun resolve(path: Path): Absolute {
if (path is Absolute) return path
return Absolute(this.parts + path.parts)
}
override val stringPath: String get() = "/" + parts.joinToString("/")
fun relativize(path: Path): Relative = when (path) {
is Relative -> path
is Absolute -> {
var idx = 0
while (idx < path.parts.size && idx < parts.size && path.parts[idx] == parts[idx]) {
idx++
}
val returns = if (idx < parts.size) {
parts.size - idx
} else {
0
}
Relative(List(returns) { ".." } + path.parts.subList(idx, path.parts.size))
}
}
}
override fun toString(): String = "Path($stringPath)"
}
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