chore: Make use of dummyPos (#598)

Author: He-Pin

sjsonnet/src-jvm/sjsonnet/stdlib/NativeXz.scala

@@ -6,8 +6,6 @@ import sjsonnet.{Error, EvalScope, Lazy, Platform, Position, Val}
 object NativeXz extends AbstractFunctionModule {
   def name = "xz"
 
-  private val dummyPos: Position = new Position(null, 0)
-
   val functions: Seq[(String, Val.Builtin)] = Seq(
     "xz" -> new Val.Builtin2(
       "xz",

sjsonnet/src/sjsonnet/functions/FunctionModule.scala

@@ -8,7 +8,12 @@ import sjsonnet.{Position, Val}
  * Function modules are collections of functions that can be used in Jsonnet.
  */
 trait FunctionModule extends FunctionBuilder {
-  protected val position = new Position(null, 0)
+
+  /**
+   * A dummy position used for functions that do not have a meaningful position in the source code.
+   * This is useful for built-in functions that are not defined in the user's code.
+   */
+  protected val dummyPos: Position = new Position(null, 0)
 
   /**
    * module name
@@ -29,7 +34,7 @@ trait FunctionModule extends FunctionBuilder {
    *   the module object
    */
   def moduleFromFunctions(functions: (String, Val.Func)*): Val.Obj = {
-    Val.Obj.mk(position, functions.map { case (k, v) => (k, memberOf(v)) }: _*)
+    Val.Obj.mk(dummyPos, functions.map { case (k, v) => (k, memberOf(v)) }: _*)
   }
 
   /**
@@ -41,7 +46,7 @@ trait FunctionModule extends FunctionBuilder {
    *   the module object
    */
   def moduleFromModules(subModules: FunctionModule*): Val.Obj = {
-    Val.Obj.mk(position, subModules.map { module => (module.name, memberOf(module.module)) }: _*)
+    Val.Obj.mk(dummyPos, subModules.map { module => (module.name, memberOf(module.module)) }: _*)
   }
 
   /**

sjsonnet/src/sjsonnet/stdlib/ArrayModule.scala

@@ -8,8 +8,6 @@ import scala.collection.mutable
 object ArrayModule extends AbstractFunctionModule {
   def name = "array"
 
-  private val dummyPos: Position = new Position(null, 0)
-
   private object MinArray
       extends Val.Builtin(
         "minArray",

sjsonnet/src/sjsonnet/stdlib/ManifestModule.scala

@@ -9,8 +9,6 @@ import scala.collection.mutable
 object ManifestModule extends AbstractFunctionModule {
   def name = "manifest"
 
-  private val dummyPos: Position = new Position(null, 0)
-
   private object ManifestJson extends Val.Builtin1("manifestJson", "v") {
     def evalRhs(v: Lazy, ev: EvalScope, pos: Position): Val =
       Val.Str(pos, Materializer.apply0(v.force, MaterializeJsonRenderer())(ev).toString)

sjsonnet/src/sjsonnet/stdlib/ObjectModule.scala

@@ -7,8 +7,6 @@ import sjsonnet.functions.AbstractFunctionModule
 object ObjectModule extends AbstractFunctionModule {
   def name = "object"
 
-  private val dummyPos: Position = new Position(null, 0)
-
   private object ObjectHas extends Val.Builtin2("objectHas", "o", "f") {
     def evalRhs(o: Lazy, f: Lazy, ev: EvalScope, pos: Position): Val =
       Val.bool(pos, o.force.asObj.containsVisibleKey(f.force.asString))

sjsonnet/src/sjsonnet/stdlib/SetModule.scala

@@ -9,8 +9,6 @@ import scala.collection.Searching.*
 object SetModule extends AbstractFunctionModule {
   def name = "set"
 
-  private val dummyPos: Position = new Position(null, 0)
-
   private object Set_ extends Val.Builtin2("set", "arr", "keyF", Array(null, Val.False(dummyPos))) {
     def evalRhs(arr: Lazy, keyF: Lazy, ev: EvalScope, pos: Position): Val = {
       uniqArr(pos, ev, sortArr(pos, ev, arr.force, keyF.force), keyF.force)