Gleb Koval
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> Search for specific commit by hash or metadata and print its content. To satisfy this final requirement, we need to have `toString()` implemented for version manager `Object`s which will allow them to be easily (and nicely) printed if needed (includes tests). Reviewed-on: #4
36 lines
1.1 KiB
Kotlin
36 lines
1.1 KiB
Kotlin
package tinyvm
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/**
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* Tree nodes are either trees or blobs, represented by this sealed class.
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*/
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sealed class Node(type: String) : Object(type)
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/**
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* A tree is a set of named nodes.
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*/
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class Tree(val nodes: Map<String, Node>) : Node("tree") {
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// For simplicity just use the hex-formatted hash, not the actual value like git does.
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override val data: String
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get() =
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nodes.map { (name, node) ->
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"${node.type} $name\u0000${node.hash()}"
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}.sorted().joinToString()
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override fun toString(): String =
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"tree ${hash()}\n" +
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nodes.map { (name, node) ->
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when (node) {
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is Tree -> "+$name/\n"
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is Blob -> "+$name\n"
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} + node.toString().leftMargin()
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}.sorted().joinToString("\n")
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}
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/**
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* A blob is a data container.
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*/
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class Blob(override val data: String) : Node("blob") {
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override fun toString(): String = "blob ${hash()}\n${data.leftMargin()}"
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}
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private fun String.leftMargin(): String = split('\n').joinToString("\n") { "| $it" } |