fix sbt error

- add HttpStatus class which set the MornyNotFound REST error result etc.
- add fields `time` and `server` to http:ping result
- fix header errors

build.sbt

@@ -3,7 +3,7 @@ aether.AetherKeys.aetherOldVersionMethod := true
 ThisBuild / organization := "cc.sukazyo"
 ThisBuild / organizationName := "A.C. Sukazyo Eyre"
 
-ThisBuild / scalaVersion := "3.4.0-RC4"
+ThisBuild / scalaVersion := "3.4.1"
 
 resolvers ++= Seq(
 		"-ws-releases" at "https://mvn.sukazyo.cc/releases"

project/MornyConfiguration.scala

@@ -16,18 +16,18 @@ object MornyConfiguration {
 	
 	val dependencies: Seq[ModuleID] = Seq(
 		
-		"com.github.spotbugs" % "spotbugs-annotations" % "4.8.2" % Compile,
+		"com.github.spotbugs" % "spotbugs-annotations" % "4.8.4" % Compile,
 		
 		"cc.sukazyo" % "messiva" % "0.2.0",
 		"cc.sukazyo" % "resource-tools" % "0.2.2",
 		
 		"com.github.pengrad" % "java-telegram-bot-api" % "6.2.0",
-		"org.http4s" %% "http4s-dsl"          % "0.23.25",
-		"org.http4s" %% "http4s-circe"        % "0.23.25",
-		"org.http4s" %% "http4s-netty-server" % "0.5.12",
+		"org.http4s" %% "http4s-dsl"          % "0.23.26",
+		"org.http4s" %% "http4s-circe"        % "0.23.26",
+		"org.http4s" %% "http4s-netty-server" % "0.5.16",
 		
-		"com.softwaremill.sttp.client3" %% "core"           % "3.9.2",
-		"com.softwaremill.sttp.client3" %% "okhttp-backend" % "3.9.2",
+		"com.softwaremill.sttp.client3" %% "core"           % "3.9.5",
+		"com.softwaremill.sttp.client3" %% "okhttp-backend" % "3.9.5",
 		"com.squareup.okhttp3" % "okhttp" % "4.12.0" % Runtime,
 		
 		"org.typelevel" %% "case-insensitive" % "1.4.0",
@@ -42,10 +42,10 @@ object MornyConfiguration {
 		// used for disable slf4j
 		// due to the slf4j api have been used in the following libraries:
 		//  - cron-utils
-		"org.slf4j" % "slf4j-nop" % "2.0.9" % Runtime,
+		"org.slf4j" % "slf4j-nop" % "2.0.13" % Runtime,
 		
-		"org.scalatest" %% "scalatest"          % "3.2.17" % Test,
-		"org.scalatest" %% "scalatest-freespec" % "3.2.17" % Test,
+		"org.scalatest" %% "scalatest"          % "3.2.18" % Test,
+		"org.scalatest" %% "scalatest-freespec" % "3.2.18" % Test,
 		// for test report
 		"com.vladsch.flexmark" % "flexmark"                 % "0.64.8" % Test,
 		"com.vladsch.flexmark" % "flexmark-profile-pegdown" % "0.64.8" % Test

project/build.properties

@@ -1 +1 @@
-sbt.version=1.9.4
+sbt.version=1.9.9

src/main/resources/assets_morny/langs/_index.hyl

@@ -0,0 +1,30 @@
+en, 2 000 000 000
+  en_us, 328 000 000
+  en_gb, 66 300 000
+  en_sg, 5 000 000
+  en_mt, 1
+  en_ph, 100 000 000
+  en_nz, 5 000 000
+  en_za, 5 000 000
+  en_au, 25 000 000
+  en_ie, 5 000 000
+  en_ca, 25 000 000
+  en_in, 125 000 000
+zh, 1 000 000 000
+  zh_hans, 1 400 000 000
+    zh_cn, 1 300 000 000
+    zh_sg, 5 000 000
+    zh_mo, 2 000 000
+  zh_hant, 50 000 000
+    zh_tw, 23 000 000
+    zh_hk, 7 000 000
+    zh_ancient, 10
+ja, 125 000 000
+  ja_jp, 10 000 000
+fr, 338 000 000
+  fr_fr, 67 000 000
+  fr_ch, 8 000 000
+  fr_be, 11 000 000
+  fr_ca, 7 000 000
+  fr_lu, 1
+mt_mt, 520 000

src/main/resources/assets_morny/langs/en_us.hyt

@@ -0,0 +1,53 @@
+	Morny Translations File
+
+%1.0
+&encoding=utf8
+&indent=1
+
+morny.command.info.message.about
+| <b>Morny Cono</b>
+| An assistant rat(micromys minutus) from Annie。
+| ————————————————
+| {about_links}
+
+morny.command.info.version
+| version:
+| - Morny <code>{version_codename}</code>
+| - <code>{version_base}</code>{version_delta_html}{version_git_suffix}
+| coeur md5_hash:
+| - <code>{md5}</code>
+| coding timestamp:
+| - <code>{time_millis}</code>
+| - <code>{time_utc} [UTC]</code>
+
+morny.command.info.message.runtime
+| system:
+| - <code>{hostname}</code>
+| - <code>{os.name}</code> <code>{os.arch}</code> <code>{os.version}</code>
+| java runtime:
+| - <code>{java.vm.vendor}.{java.vm.name}</code>
+| - <code>{java.vm.version}</code>
+| vm memory:
+| - <code>{memory_used_mb}</code> / <code>{memory_available_mb}</code> MB
+| - <code>{cpu_cores}</code> cores
+| coeur version:
+| - {version_full}
+| - <code>{coeur_md5}</code>
+| - <code>{compile_time_utc} [UTC]</code>
+| - [<code>{compile_time_millis}</code>]
+| continuous:
+| - <code>{running_duration}</code>
+| - [<code>{running_duration_ms}</code>]
+| - <code>{startup_time_utc}</code>
+| - [<code>{startup_time_millis}</code>]
+
+morny.command.info.message.tasks
+| <b>Coeur Task Scheduler:</b>
+|  - <i>scheduled tasks</i>: <code>{coeur.tasks.amount}</code>
+|  - <i>scheduler status</i>: <code>{coeur.tasks.state}</code>
+|  - <i>current runner status</i>: <code>{coeur.tasks.runnerState}</code>
+
+morny.command.info.message.event
+| <b>Event Statistics :</b>
+| in today
+| {event_statistics}""".stripMargin

src/main/resources/assets_morny/langs/zh_cn.hyt

@@ -0,0 +1,11 @@
+	Morny Translations File
+
+%1.0
+&encoding=utf8
+&indent=1
+
+morny.command.info.about
+| <b>Morny Cono</b>
+| 来自安妮的侍从小鼠。
+| ————————————————
+| {about_links}

src/main/scala/cc/sukazyo/cono/morny/core/MornyAbout.scala

@@ -1,6 +1,6 @@
 package cc.sukazyo.cono.morny.core
 
-import cc.sukazyo.cono.morny.core.MornyAssets
+import cc.sukazyo.cono.morny.data.MornyAssets
 
 import java.io.IOException
 

src/main/scala/cc/sukazyo/cono/morny/core/MornyCoeur.scala

@@ -397,7 +397,7 @@ class MornyCoeur (modules: List[MornyModule])(using val config: MornyConfig)(tes
 					break(Some(LoginResult(account, remote.username, remote.id)))
 				} catch
 					case r: boundary.Break[Option[LoginResult]] => throw r
-					case e =>
+					case e: Throwable =>
 						logger `error`
 							s"""${e.toLogString}
 							   |login failed"""

src/main/scala/cc/sukazyo/cono/morny/core/http/ServiceUI.scala

@@ -2,17 +2,14 @@ package cc.sukazyo.cono.morny.core.http
 
 import cats.effect.IO
 import cc.sukazyo.cono.morny.core.http.api.HttpService4Api
-import cc.sukazyo.cono.morny.data.TelegramImages
-import org.http4s.{HttpRoutes, MediaType}
+import org.http4s.HttpRoutes
 import org.http4s.dsl.io.*
-import org.http4s.headers.`Content-Type`
 
 class ServiceUI extends HttpService4Api {
 	
 	override lazy val service: HttpRoutes[IO] = HttpRoutes.of[IO] {
 		case GET -> Root =>
-			NotImplemented(TelegramImages.IMG_501.get)
-				.map(_.withContentType(`Content-Type`(MediaType.image.jpeg)))
+			MornyNotImplemented()
 	}
 	
 }

src/main/scala/cc/sukazyo/cono/morny/core/http/api/HttpService4Api.scala

@@ -1,32 +1,12 @@
 package cc.sukazyo.cono.morny.core.http.api
 
 import cats.effect.IO
-import cc.sukazyo.cono.morny.util.UseThrowable.toLogString
-import org.http4s.{HttpRoutes, Response}
+import org.http4s.HttpRoutes
 
-trait HttpService4Api {
+trait HttpService4Api extends HttpStatus {
 	
 	lazy val service: HttpRoutes[IO]
 	
-	extension (response: Response[IO]) {
-		def setMornyInternalErrorHeader (e: Throwable): Response[IO] =
-			response.setMornyInternalErrorHeader(
-				e.getClass.getSimpleName,
-				e.getMessage,
-				e.toLogString
-			)
-		def setMornyInternalErrorHeader (
-			`Morny-Internal-Error-Type`: String,
-			`Morny-Internal-Error-Message`: String,
-			`Morny-Internal-Error-Detail`: String
-		): Response[IO] =
-			response.withHeaders(
-				"Morny-Internal-Error-Type" -> `Morny-Internal-Error-Type`,
-				"Morny-Internal-Error-Message" -> `Morny-Internal-Error-Message`,
-				"Morny-Internal-Error-Detail" -> `Morny-Internal-Error-Detail`,
-			)
-	}
-	
 }
 
 object HttpService4Api {

src/main/scala/cc/sukazyo/cono/morny/core/http/api/HttpStatus.scala

@@ -0,0 +1,60 @@
+package cc.sukazyo.cono.morny.core.http.api
+
+import cats.effect.IO
+import cc.sukazyo.cono.morny.data.TelegramImages
+import cc.sukazyo.cono.morny.util.UseThrowable.toLogString
+import org.http4s.{Header, MediaType, Response}
+import org.http4s.dsl.io.*
+import org.http4s.headers.`Content-Type`
+
+trait HttpStatus {
+	
+	private type ResponseT = Response[IO]
+	private type ResponseIO = IO[ResponseT]
+	
+	extension (response: ResponseT) {
+		def setMornyInternalErrorHeader (e: Throwable): ResponseT =
+			response.setMornyInternalErrorHeader(
+				e.getClass.getSimpleName,
+				e.getMessage,
+				e.toLogString
+			)
+		def setMornyInternalErrorHeader (
+			`Morny-Internal-Error-Type`: String,
+			`Morny-Internal-Error-Message`: String,
+			`Morny-Internal-Error-Detail`: String
+		): ResponseT =
+			response
+				.putHeaders(
+					"Morny-Internal-Error-Type" -> `Morny-Internal-Error-Type`,
+					"Morny-Internal-Error-Message" -> `Morny-Internal-Error-Message`,
+					"Morny-Internal-Error-Detail" -> `Morny-Internal-Error-Detail`,
+				)
+	}
+	
+	/** 400 Bad Request */
+	def MornyBadRequest (): ResponseIO =
+		BadRequest(TelegramImages.IMG_400.get)
+			.map(_.withContentType(`Content-Type`(MediaType.image.png)))
+	
+	/** 404 Not Found */
+	def MornyNotFound (): ResponseIO =
+		NotFound(TelegramImages.IMG_404.get)
+			.map(_.withContentType(`Content-Type`(MediaType.image.png)))
+	
+	/** 500 Internal Server Error */
+	def MornyInternalServerError  (): ResponseIO =
+		InternalServerError(TelegramImages.IMG_500.get)
+			.map(_.withContentType(`Content-Type`(MediaType.image.png)))
+	
+	/** 501 Not Implemented */
+	def MornyNotImplemented (): ResponseIO =
+		NotImplemented(TelegramImages.IMG_501.get)
+			.map(_.withContentType(`Content-Type`(MediaType.image.png)))
+	
+	/** 523 Service Unavailable */
+	def MornyServiceUnavailable (): ResponseIO =
+		ServiceUnavailable(TelegramImages.IMG_523.get)
+			.map(_.withContentType(`Content-Type`(MediaType.image.png)))
+	
+}

src/main/scala/cc/sukazyo/cono/morny/core/http/services/Ping.scala

@@ -2,14 +2,18 @@ package cc.sukazyo.cono.morny.core.http.services
 
 import cats.effect.IO
 import cc.sukazyo.cono.morny.core.http.api.HttpService4Api
+import cc.sukazyo.cono.morny.core.MornySystem
+import cc.sukazyo.cono.morny.util.CommonFormat
 import org.http4s.{HttpRoutes, Response}
 import org.http4s.circe.jsonEncoder
 import org.http4s.dsl.io.*
 
 class Ping extends HttpService4Api {
 	
-	case class PingResult (
-		pong: Boolean = true
+	private case class PingResult (
+		pong: Boolean = true,
+		time: String = CommonFormat.formatDate(System.currentTimeMillis(), 0),
+		server: String = MornySystem.VERSION_FULL,
 	)
 	
 	override lazy val service: HttpRoutes[IO] = HttpRoutes.of[IO] {

src/main/scala/cc/sukazyo/cono/morny/data/MornyAssets.scala

@@ -1,4 +1,4 @@
-package cc.sukazyo.cono.morny.core
+package cc.sukazyo.cono.morny.data
 
 import cc.sukazyo.restools.ResourcesPackage
 

src/main/scala/cc/sukazyo/cono/morny/data/TelegramImages.scala

@@ -1,7 +1,6 @@
 package cc.sukazyo.cono.morny.data
 
-import cc.sukazyo.cono.morny.core.MornyAssets
-import cc.sukazyo.cono.morny.core.MornyAssets.AssetsException
+import cc.sukazyo.cono.morny.data.MornyAssets.AssetsException
 
 import java.io.IOException
 import scala.language.postfixOps
@@ -31,6 +30,7 @@ object TelegramImages {
 	}
 	
 	val IMG_ABOUT: AssetsFileImage = AssetsFileImage("images/featured-image@0.5x.jpg")
+	val IMG_400: AssetsFileImage = AssetsFileImage("images/http-sekai-400.png")
 	val IMG_404: AssetsFileImage = AssetsFileImage("images/http-sekai-404.png")
 	val IMG_500: AssetsFileImage = AssetsFileImage("images/http-sekai-500.png")
 	val IMG_501: AssetsFileImage = AssetsFileImage("images/http-sekai-501.png")

src/main/scala/cc/sukazyo/cono/morny/stickers_get/http/StickerService.scala

@@ -3,14 +3,12 @@ package cc.sukazyo.cono.morny.stickers_get.http
 import cats.effect.IO
 import cc.sukazyo.cono.morny.core.http.api.HttpService4Api
 import cc.sukazyo.cono.morny.core.MornyCoeur
-import cc.sukazyo.cono.morny.data.TelegramImages
 import cc.sukazyo.cono.morny.util.tgapi.TelegramExtensions.File.getContent
 import cc.sukazyo.cono.morny.util.tgapi.TelegramExtensions.Requests.execute
 import com.pengrad.telegrambot.request.GetFile
 import com.pengrad.telegrambot.TelegramBot
-import org.http4s.{HttpRoutes, MediaType}
+import org.http4s.HttpRoutes
 import org.http4s.dsl.io.*
-import org.http4s.headers.`Content-Type`
 
 import java.io.IOException
 
@@ -28,34 +26,26 @@ class StickerService (using coeur: MornyCoeur) extends HttpService4Api {
 						Ok(file)
 					} catch {
 						case e: IOException =>
-							ServiceUnavailable(
-								TelegramImages.IMG_523.get,
-								`Content-Type`(MediaType.image.png),
-							).map(_.setMornyInternalErrorHeader(e))
+							MornyServiceUnavailable()
+								.map(_.setMornyInternalErrorHeader(e))
 					}
 				else
-					NotFound(
-						TelegramImages.IMG_404.get,
-						`Content-Type`(MediaType.image.png),
-					).map(_.setMornyInternalErrorHeader(
-						"_telegram_api",
-						response.errorCode.toString,
-						response.description,
-					))
+					MornyNotFound()
+						.map(_.setMornyInternalErrorHeader(
+							"_telegram_api",
+							response.errorCode.toString,
+							response.description,
+						))
 			} catch
 				case io: IOException =>
-					ServiceUnavailable(
-						TelegramImages.IMG_523.get,
-						`Content-Type`(MediaType.image.png),
-					).map(_.setMornyInternalErrorHeader(io))
+					MornyServiceUnavailable()
+						.map(_.setMornyInternalErrorHeader(io))
 				case e: Throwable =>
-					InternalServerError(
-						TelegramImages.IMG_500.get,
-						`Content-Type`(MediaType.image.png),
-					).map(_.setMornyInternalErrorHeader(e))
+					MornyInternalServerError()
+						.map(_.setMornyInternalErrorHeader(e))
 		
-		case GET -> Root / "sticker" =>
-			NotFound("not found")
+		case GET -> "sticker" /: rest =>
+			MornyBadRequest() // TODO: bad request
 		
 	}
 }

src/main/scala/cc/sukazyo/cono/morny/util/hytrans/Definitions.scala

@@ -0,0 +1,14 @@
+package cc.sukazyo.cono.morny.util.hytrans
+
+//opaque type Definitions = Map[String, String]
+
+class Definitions (
+	innerData: Map[String, String]
+) extends Map[String, String] {
+	
+	def iterator: Iterator[(String, String)] = innerData.iterator
+	def removed (key: String): Map[String, String] = innerData.removed(key)
+	def updated[V1 >: String] (key: String, value: V1): Map[String, V1] = innerData.updated(key, value)
+	def get (key: String): Option[String] = innerData.get(key)
+	
+}

src/main/scala/cc/sukazyo/cono/morny/util/hytrans/LangTag.scala

@@ -0,0 +1,33 @@
+package cc.sukazyo.cono.morny.util.hytrans
+
+case class LangTag (
+	lang: String,
+	priority: Long
+) extends Comparable[LangTag] {
+	
+	override def compareTo(o: LangTag): Int =
+		this.priority `compareTo` o.priority
+	
+}
+
+object LangTag {
+	
+	class IllegalLangTagException (message: String, val original: String)
+		extends IllegalArgumentException(message)
+	
+	def normalizeLangTag(tag: String): String =
+		tag.replaceAll("-", "_").toLowerCase
+	
+	@throws[IllegalLangTagException]
+	def ensureLangTag (tag: String): String =
+		tag.foreach {
+			case c if c.isLetter =>
+			case '_' =>
+			case ' ' | '\t' | '\r' | '\n' =>
+				throw IllegalLangTagException("Lang Tag cannot contains space", tag)
+			case ill =>
+				throw IllegalLangTagException(s"Illegal character '$ill' in Lang Tag \"$tag\"", tag)
+		}
+		tag
+	
+}

src/main/scala/cc/sukazyo/cono/morny/util/hytrans/LanguageTree.scala

@@ -0,0 +1,188 @@
+package cc.sukazyo.cono.morny.util.hytrans
+
+import cc.sukazyo.cono.morny.util.hytrans.LangTag.IllegalLangTagException
+
+import java.io.{PrintWriter, StringWriter}
+import scala.collection.mutable
+import scala.util.boundary
+
+class LanguageTree {
+	
+	class Node (val langTag: LangTag) extends Comparable[Node] {
+		private object LangTagOrdering extends Ordering[Node]:
+			override def compare (x: Node, y: Node): Int = y.langTag `compareTo` x.langTag
+		
+		override def compareTo (o: Node): Int = this.langTag `compareTo` o.langTag
+		
+		private type ChildCol = mutable.SortedSet[Node]
+		
+		private var _parent: Option[Node] = None
+		private val _children: ChildCol = mutable.SortedSet.empty(using LangTagOrdering)
+		
+		def parent: Option[Node] = _parent
+		def children: ChildCol = _children
+		
+		def traverseParent (f: Node => Unit): Unit =
+			_parent.foreach { parent =>
+				f(parent)
+				parent.traverseParent(f)
+			}
+		
+		private def traversingTree (f: Node => Unit)(using visited: mutable.Set[Node]): Unit =
+			_children.foreach { child =>
+				if !(visited contains child) then
+					child.traversingTree(f)
+			}
+			if !(visited contains this) then
+				f(this)
+				visited += this
+			this.parent.foreach { parent =>
+				if !(visited contains parent) then
+					parent.traversingTree(f)
+			}
+		
+		def traverseTree (f: Node=>Unit): Unit =
+			val visited = mutable.Set.empty[Node]
+			f(this)
+			visited += this
+			traversingTree(f)(using visited)
+		
+		@throws[IllegalArgumentException]
+		private infix def setParent (parent: Node): Unit =
+			this._parent = Some(parent)
+			parent.traverseParent { p =>
+				if p == parent then
+					throw new IllegalArgumentException(
+						s"failed set parent ${parent.langTag.lang} to ${langTag.lang}: " +
+						s"Cannot set parent to a child of itself"
+					)
+					this._parent = None
+			}
+		
+		def detachParent (): Unit =
+			this._parent.foreach(_.removeChild(this))
+		
+		def removeChild (child: Node): Unit =
+			child._parent = None
+			_children -= child
+		
+		@throws[IllegalArgumentException]
+		infix def addChild (child: Node): Unit =
+			val child_old_parent = child._parent
+			if child._parent.nonEmpty then
+				child.detachParent()
+			try child setParent this
+			catch case e: IllegalArgumentException =>
+				child_old_parent.foreach(_ addChild child)
+				throw e
+			this._children += child
+		
+		@throws[IllegalArgumentException]
+		infix def addChild (child: LangTag): Node =
+			val node = new Node(child)
+			addChild(node)
+			node
+		
+		private def printTree (node: Node, prefix: String = "", printer: PrintWriter): Unit = {
+			printer.println(s"$prefix${node.langTag}")
+			node.children.foreach { child =>
+				printTree(child, prefix + "  ", printer)
+			}
+		}
+		
+		def printTree: String =
+			val s = StringWriter()
+			printTree(this, "", PrintWriter(s))
+			s.toString
+		
+		override def toString: String =
+			printTree
+		
+	}
+	object Node:
+		def defaultRoot: Node = Node(LangTag("root", 0))
+	
+	val root: Node = Node.defaultRoot
+	
+	def search (langTag: String): Option[Node] =
+		val _langTag = LangTag.normalizeLangTag(langTag)
+		boundary {
+			root.traverseTree { node =>
+				if node.langTag.lang == _langTag then
+					boundary.break(Some(node))
+			}
+			None
+		}
+	
+}
+
+object LanguageTree {
+	
+	@throws[IllegalArgumentException]
+	def parseTreeDocument (document: String): LanguageTree = {
+		
+		val lines = document.replaceAll("\\r", "").split('\n')
+		val tree = new LanguageTree
+		val root = tree.root
+		import tree.Node
+		var currentLevel = mutable.ListBuffer[Node](root)
+		
+		def countHeadingWhitespaceLevel (line: String)(using whitespaceSize: Int): Option[(Int, String)] =
+			val whitespace = line.takeWhile(_.isWhitespace)
+			if whitespace.length % whitespaceSize == 0 then
+				Some(whitespace.length / whitespaceSize -> line.drop(whitespace.length))
+			else None
+		
+		for (i <- lines.indices) {
+			val line = lines(i)
+			val line_number = i+1
+			countHeadingWhitespaceLevel(line)(using 2) match
+				case Some((level, content)) =>
+					val langTag: LangTag = content.split(",", 2) match
+						case Array(lang) =>
+							try LangTag(LangTag.ensureLangTag(LangTag.normalizeLangTag(lang)), 0)
+							catch case e: IllegalLangTagException =>
+								throw new IllegalArgumentException(
+									s"illegal lang name at line $line_number: ${e.getMessage}"
+								).initCause(e)
+						case Array(lang, priority) =>
+							try LangTag(
+								LangTag.ensureLangTag(LangTag.normalizeLangTag(lang)),
+								priority.filterNot(List(' ', ',', '-', '_', '\'').contains(_)).toInt
+							)
+							catch
+								case e: NumberFormatException =>
+									throw new IllegalArgumentException(
+										s"failed parse lang's priority at line $line_number: ${e.getMessage}"
+									).initCause(e)
+								case e: IllegalLangTagException =>
+									throw new IllegalArgumentException(
+										s"illegal lang name at line $line_number: ${e.getMessage}"
+									).initCause(e)
+						case _ =>
+							throw new IllegalArgumentException(
+								s"failed parse at line $line_number: line with invalid format."
+							)
+					val node = Node(langTag)
+					if level < (currentLevel.length + 1) then
+						currentLevel = currentLevel take (level + 1)
+						currentLevel.last addChild node
+						currentLevel += node
+					else if level == (currentLevel.length + 1) then
+						currentLevel.last addChild node
+						currentLevel += node
+					else
+						throw new IllegalArgumentException(
+							s"failed parse at line $line_number: line with invalid indentation."
+						)
+				case None =>
+					throw new IllegalArgumentException(
+						s"failed parse at line $line_number: line with invalid indentation."
+					)
+		}
+		
+		tree
+		
+	}
+	
+}

src/main/scala/cc/sukazyo/cono/morny/util/hytrans/Parser.scala

@@ -0,0 +1,41 @@
+package cc.sukazyo.cono.morny.util.hytrans
+
+object Parser {
+	
+	def parse (document: String): Definitions = {
+		
+		val lines = document.replaceAll("\\r", "").split('\n')
+		
+		val keyValues = collection.mutable.Map.empty[String, String]
+		var keyDef: String | Null = null
+		def newValue = StringBuilder()
+		var valueDef: StringBuilder = newValue
+		def addLine (line: String) =
+			valueDef ++= line += '\n'
+		//noinspection TypeAnnotation
+		def saveThis() =
+			if keyDef != null then
+				keyValues += (keyDef -> valueDef.toString.stripSuffix("\n"))
+				keyDef = null
+				valueDef = newValue
+		
+		lines.foreach { line =>
+			line.headOption match {
+				case Some(' ') | Some('\t') | None => // empty lines, will be ignored
+				case Some('#') => // comment line, will be ignored
+				case Some('%') => // document meta definition line, currently not supported
+				case Some('|') => // content line
+					addLine(line drop 2)
+				case Some(_) => // a key definition line
+					saveThis()
+					keyDef = line
+			}
+		}
+		
+		saveThis()
+		
+		Definitions(keyValues.toMap)
+		
+	}
+	
+}

src/main/scala/cc/sukazyo/cono/morny/util/hytrans/Translations.scala

@@ -0,0 +1,45 @@
+package cc.sukazyo.cono.morny.util.hytrans
+
+import cc.sukazyo.cono.morny.util.var_text.{Var, VarText}
+
+import scala.util.boundary
+
+class Translations (
+	langs: LanguageTree,
+	translations: Map[String, Definitions]
+) {
+	
+	def traverse (using lang: String)(f: (LangTag, Definitions) => Unit): Unit = {
+		langs.search(lang)
+			.getOrElse(langs.root)
+			.traverseTree(node =>
+				translations.get(node.langTag.lang)
+					.map(
+						f(node.langTag, _)
+					)
+			)
+	}
+	
+	def traverseWithKey (key: String)(using lang: String)(f: (LangTag, Option[String]) => Unit): Unit = {
+		this.traverse (using lang) { (langTag, definitions) =>
+			f(langTag, definitions.get(key))
+		}
+	}
+	
+	def get (key: String)(using lang: String): Option[String] = {
+		boundary {
+			traverseWithKey(key) { (_, value) =>
+				if value.nonEmpty then
+					boundary.break(Some(value.get))
+			}
+			None
+		}
+	}
+	
+	def trans (key: String)(using lang: String): VarText =
+		VarText(get(key).getOrElse(s"#[$key@$lang]"))
+	
+	def trans (key: String, args: Var*)(using lang: String): String =
+		trans(key).render(args*)
+	
+}