making Yaml and BFS of QNDTree work

src/net/torvald/terrarum/QNDTreeNode.kt

@@ -1,6 +1,7 @@
 package net.torvald.terrarum
 
-import java.util.ArrayList
+import java.util.*
+import kotlin.collections.ArrayList
 
 class QNDTreeNode<T>(var data: T? = null, var parent: QNDTreeNode<T>? = null) {
     var children = ArrayList<QNDTreeNode<T>>()
@@ -18,11 +19,54 @@ class QNDTreeNode<T>(var data: T? = null, var parent: QNDTreeNode<T>? = null) {
         action(node, depth)
     }
 
+    /**
+     * (QNDTreeNode, Int) is Node-depth pair, starting from zero.
+     */
     fun traversePreorder(action: (QNDTreeNode<T>, Int) -> Unit) {
         this.traverse1(this, action)
     }
 
+    /**
+     * (QNDTreeNode, Int) is Node-depth pair, starting from zero.
+     */
     fun traversePostorder(action: (QNDTreeNode<T>, Int) -> Unit) {
         this.traverse2(this, action)
     }
+
+    /**
+     * (QNDTreeNode, Int) is Node-depth pair, starting from zero.
+     */
+    fun traverseLevelorder(action: (QNDTreeNode<T>, Int) -> Unit) {
+        val q = ArrayList<Pair<QNDTreeNode<T>, Int>>() // node, depth
+        q.add(this to 0)
+        while (q.isNotEmpty()) {
+            val node = q.removeAt(0)
+            action(node.first, node.second)
+            node.first.children.forEach {
+                q.add(it to node.second + 1)
+            }
+        }
+    }
+
+    /**
+     * Retrieves data in the node in a specific depth (level).
+     * Probably only useful for level = 1
+     */
+    fun getLevelData(level: Int): List<T?> {
+        val list = ArrayList<T?>()
+
+        traversePreorder { node, i ->
+            if (i == level) {
+                list.add(node.data)
+            }
+        }
+
+        return list
+    }
+
+    override fun toString() = data.toString()
+
+    fun print() {
+        TODO()
+    }
 }

src/net/torvald/terrarum/Yaml.kt

@@ -44,6 +44,7 @@ import java.util.*
  * - All lines are indented with one space
  * - All entries are preceded by '- ' (dash and a space)
  * - All propery are separated by ' : ' (space colon space)
+ * - A line that does not start with '- ' are simply ignored, so you can freely make empty lines and/or comments.
  *
  * Any deviation to the above rule will cause a parse failure, because it's simple and dumb as that.
  *
@@ -55,39 +56,41 @@ inline class Yaml(val text: String) {
         val SEPARATOR = Regex(" : ")
     }
 
-
     fun parse(): QNDTreeNode<String> {
         var currentIndentLevel = -1
         val root = QNDTreeNode<String>()
         var currentNode = root
         val nodesStack = Stack<QNDTreeNode<String>>()
+        val validLineStartRe = Regex(""" *\- """)
 
         nodesStack.push(currentNode)
 
         text.split('\n') .forEach {
-            val indentLevel = it.countSpaces()
-            val it = it.trimIndent()
-            if (it.startsWith("- ")) {
-                val nodeName = it.drop(2)
+            if (validLineStartRe.containsMatchIn(it)) { // take partial match; do the task if the text's line is valid
+                val indentLevel = it.countSpaces()
+                val it = it.trimIndent()
+                if (it.startsWith("- ")) { // just double check if indent-trimmed line looks valid
+                    val nodeName = it.drop(2)
 
-                if (indentLevel == currentIndentLevel) {
-                    val sibling = QNDTreeNode(nodeName, currentNode.parent)
-                    currentNode.parent!!.children.add(sibling)
-                    currentNode = sibling
-                }
-                else if (indentLevel > currentIndentLevel) {
-                    val childNode = QNDTreeNode(nodeName, currentNode)
-                    currentNode.children.add(childNode)
-                    nodesStack.push(currentNode)
-                    currentNode = childNode
-                    currentIndentLevel = indentLevel
-                }
-                else {
-                    repeat(currentIndentLevel - indentLevel) { currentNode = nodesStack.pop() }
-                    currentIndentLevel = indentLevel
-                    val sibling = QNDTreeNode(nodeName, currentNode.parent)
-                    currentNode.parent!!.children.add(sibling)
-                    currentNode = sibling
+                    if (indentLevel == currentIndentLevel) {
+                        val sibling = QNDTreeNode(nodeName, currentNode.parent)
+                        currentNode.parent!!.children.add(sibling)
+                        currentNode = sibling
+                    }
+                    else if (indentLevel > currentIndentLevel) {
+                        val childNode = QNDTreeNode(nodeName, currentNode)
+                        currentNode.children.add(childNode)
+                        nodesStack.push(currentNode)
+                        currentNode = childNode
+                        currentIndentLevel = indentLevel
+                    }
+                    else {
+                        repeat(currentIndentLevel - indentLevel) { currentNode = nodesStack.pop() }
+                        currentIndentLevel = indentLevel
+                        val sibling = QNDTreeNode(nodeName, currentNode.parent)
+                        currentNode.parent!!.children.add(sibling)
+                        currentNode = sibling
+                    }
                 }
             }
         }

src/net/torvald/terrarum/tests/QNDTreeTest.kt

@@ -0,0 +1,78 @@
+package net.torvald.terrarum.tests
+
+import net.torvald.terrarum.Yaml
+import net.torvald.terrarum.modulebasegame.ui.UITitleRemoConYaml
+
+/**
+ * Created by minjaesong on 2018-12-08.
+ */
+class QNDTreeTest {
+
+    val treeStr = """
+- File
+ - New : Ctrl-N
+ - Open : Ctrl-O
+ - Open Recent
+  - yaml_example.yaml
+  - Yaml.kt
+ - Close : Ctrl-W
+ - Settings
+ - Line Separators
+  - CRLF
+  - CR
+  - LF
+- Edit
+ - Undo : Ctrl-Z
+ - Redo : Shift-Ctrl-Z
+ - Cut : Ctrl-X
+ - Copy : Ctrl-C
+ - Paste : Ctrl-V
+ - Find
+  - Find : Ctrl-F
+  - Replace : Shift-Ctrl-F
+ - Convert Indents
+  - To Spaces
+   - Set Project Indentation
+  - To Tabs
+- Refactor
+ - Refactor This
+ - Rename : Shift-Ctrl-R
+ - Extract
+  - Variable
+  - Property
+  - Function
+"""
+
+    operator fun invoke() {
+        val treeYaml = Yaml(treeStr)
+        val tree = treeYaml.parse()
+
+        println("\nTest traversePreorder()\n")
+        tree.traversePreorder { qndTreeNode, i ->
+            print("-".repeat(i))
+            print(" ")
+            println("$qndTreeNode <- ${qndTreeNode.parent}")
+        }
+
+        println("\nTest traversePostOrder()\n")
+        tree.traversePostorder { qndTreeNode, i ->
+            print("-".repeat(i))
+            print(" ")
+            println("$qndTreeNode <- ${qndTreeNode.parent}")
+        }
+
+        println("\nTest traverseLevelOrder()\n")
+        tree.traverseLevelorder { qndTreeNode, i ->
+            print("-".repeat(i))
+            print(" ")
+            println("$qndTreeNode <- ${qndTreeNode.parent}")
+        }
+        println("\nLevel 1 nodes:\n")
+        println(tree.getLevelData(1))
+    }
+
+}
+
+fun main(args: Array<String>) {
+    QNDTreeTest().invoke()
+}

src/net/torvald/terrarum/ui/UIItemNSMenus.kt

@@ -11,9 +11,10 @@ import net.torvald.terrarum.Yaml
         override var posX: Int,
         override var posY: Int,
         override var width: Int,
-        val tree: Yaml
+        val treeRepresentation: Yaml
 ) : UIItem(parent) {
 
-    override val height: Int
-        get() = TODO("not implemented")
+    val tree = treeRepresentation.parse()
+
+    override val height = -1
 }*/