feat: -parse:goal=Module

src/main/scala/esmeta/Command.scala

@@ -121,6 +121,7 @@ case object CmdParse extends Command("parse", CmdExtract >> Parse) {
     "esmeta parse a.js                         # parse a.js file.",
     "esmeta parse a.js -extract:target=es2025  # parse with es2025 spec.",
     "esmeta parse a.js -parse:debug            # parse in the debugging mode.",
+    "esmeta parse a.js -parse:goal=Module      # parse as an ECMAScript module.",
   )
   override val targetName = "<js>+"
 }

src/main/scala/esmeta/cfg/CFG.scala

@@ -36,6 +36,7 @@ case class CFG(
   /** an ECMAScript parser */
   lazy val esParser: ESParser = program.esParser
   lazy val scriptParser: AstFrom = esParser("Script")
+  lazy val moduleParser: AstFrom = esParser("Module")
 
   /** initializer for initial states */
   lazy val init: Initialize = new Initialize(this)

src/main/scala/esmeta/phase/Parse.scala

@@ -17,16 +17,22 @@ case object Parse extends Phase[Spec, Ast] {
     config: Config,
   ): Ast =
     val filename = getFirstFilename(cmdConfig, name)
-    ESParser(spec.grammar, config.debug)("Script").fromFile(filename)
+    ESParser(spec.grammar, config.debug)(config.goal).fromFile(filename)
   def defaultConfig: Config = Config()
   val options: List[PhaseOption[Config]] = List(
     (
       "debug",
       BoolOption(_.debug = _),
       "turn on debugging mode.",
     ),
+    (
+      "goal",
+      StrOption(_.goal = _),
+      "parsing goal: Script or Module (default: Script).",
+    ),
   )
   case class Config(
     var debug: Boolean = false,
+    var goal: String = "Script",
   )
 }

src/main/scala/esmeta/spec/Spec.scala

@@ -28,6 +28,7 @@ case class Spec(
   /** ECMAScript parser */
   lazy val esParser: ESParser = ESParser(grammar)
   lazy val scriptParser: AstFrom = esParser("Script")
+  lazy val moduleParser: AstFrom = esParser("Module")
 
   /** get incomplete algorithms */
   lazy val incompleteAlgorithms: List[Algorithm] =