Add 'scriptless' mode to orx-olive

orx-kotlin-parser/src/main/kotlin/TreeUtils.kt

@@ -0,0 +1,47 @@
+import org.antlr.v4.runtime.misc.Utils
+import org.antlr.v4.runtime.tree.Tree
+import org.antlr.v4.runtime.tree.Trees
+
+object TreeUtils {
+    /** Platform dependent end-of-line marker  */
+    val Eol = System.lineSeparator()
+
+    /** The literal indent char(s) used for pretty-printing  */
+    const val Indents = "  "
+    private var level = 0
+
+    /**
+     * Pretty print out a whole tree. [.getNodeText] is used on the node payloads to get the text
+     * for the nodes. (Derived from Trees.toStringTree(....))
+     */
+    fun toPrettyTree(t: Tree, ruleNames: List<String>): String {
+        level = 0
+        return process(t, ruleNames).replace("(?m)^\\s+$".toRegex(), "").replace("\\r?\\n\\r?\\n".toRegex(), Eol)
+    }
+
+    private fun process(t: Tree, ruleNames: List<String>): String {
+        if (t.getChildCount() === 0) return Utils.escapeWhitespace(Trees.getNodeText(t, ruleNames), false)
+        val sb = StringBuilder()
+        sb.append(lead(level))
+        level++
+        val s: String = Utils.escapeWhitespace(Trees.getNodeText(t, ruleNames), false)
+        sb.append("$s ")
+        for (i in 0 until t.getChildCount()) {
+            sb.append(process(t.getChild(i), ruleNames))
+        }
+        level--
+        sb.append(lead(level))
+        return sb.toString()
+    }
+
+    private fun lead(level: Int): String {
+        val sb = StringBuilder()
+        if (level > 0) {
+            sb.append(Eol)
+            for (cnt in 0 until level) {
+                sb.append(Indents)
+            }
+        }
+        return sb.toString()
+    }
+}