Send conversion method suggestions (#7857)

close #7320

Changelog:
- update: enable conversion suggestions
- fix: conversion suggestion building
- fix: conversion suggestion types
- fix: conversion JSON-RPC representation

# Important Notes
For example, the [`Day_Of_Week_From`](5150c14afd/distribution/lib/Standard/Base/0.0.0-dev/src/Data/Time/Day_Of_Week_From.enso) conversion is sent as


```json
{
"type":"Add",
"id":32,
"suggestion":{
"type":"method",
"module":"Standard.Base.Data.Time.Day_Of_Week_From",
"name":"from",
"arguments":[
{
"name":"that",
"reprType":"Standard.Base.Data.Numbers.Integer",
"isSuspended":false,
"hasDefault":false,
"defaultValue":null,
"tagValues":null
},
{
"name":"first_day",
"reprType":"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week",
"isSuspended":false,
"hasDefault":true,
"defaultValue":"Day_Of_Week.Sunday",
"tagValues":[
"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week.Sunday",
"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week.Monday",
"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week.Tuesday",
"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week.Wednesday",
"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week.Thursday",
"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week.Friday",
"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week.Saturday"
]
},
{
"name":"start_at_zero",
"reprType":"Standard.Base.Data.Boolean.Boolean",
"isSuspended":false,
"hasDefault":true,
"defaultValue":"False",
"tagValues":[
"Standard.Base.Data.Boolean.Boolean.True",
"Standard.Base.Data.Boolean.Boolean.False"
]
}
],
"selfType":"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week",
"returnType":"Standard.Base.Data.Time.Day_Of_Week.Day_Of_Week",
"isStatic":false,
"documentation":" Convert from an integer to a Day_Of_Week\n\nArguments:\n- `that`: The first day of the week.\n- `first_day`: The first day of the week.\n- `start_at_zero`: If True, first day of the week is 0 otherwise is 1.",
"annotations":[

]
}
}
```

engine/language-server/src/main/scala/org/enso/languageserver/search/SearchProtocol.scala

@@ -126,19 +126,12 @@ object SearchProtocol {
 
   private def conversionToMethod(
     conversion: Suggestion.Conversion
-  ): Suggestion.DefinedMethod = {
-    val arg = Suggestion.Argument(
-      Suggestion.Kind.Conversion.From,
-      conversion.selfType,
-      false,
-      false,
-      None
-    )
+  ): Suggestion.DefinedMethod =
     Suggestion.DefinedMethod(
       conversion.externalId,
       conversion.module,
       conversion.name,
-      arg +: conversion.arguments,
+      conversion.arguments,
       conversion.returnType,
       conversion.returnType,
       conversion.isStatic,
@@ -146,7 +139,6 @@ object SearchProtocol {
       conversion.annotations,
       conversion.reexport
     )
-  }
 
   private def getterToMethod(
     getter: Suggestion.Getter

engine/runtime/src/main/scala/org/enso/compiler/context/SuggestionBuilder.scala

@@ -159,21 +159,24 @@ final class SuggestionBuilder[A: IndexedSource](
 
           case definition.Method
                 .Conversion(
-                  Name.MethodReference(_, _, _, _, _),
-                  Name.Literal(sourceTypeName, _, _, _, _),
+                  Name.MethodReference(typePtr, _, _, _, _),
+                  _,
                   Function.Lambda(args, body, _, _, _, _),
                   _,
                   _,
                   _
-                ) if ConversionsEnabled =>
-            val typeSignature = ir.getMetadata(TypeSignatures)
+                ) =>
+            val selfType = typePtr.flatMap { typePointer =>
+              typePointer
+                .getMetadata(MethodDefinitions)
+                .map(_.target.qualifiedName)
+            }
             val conversion = buildConversion(
               body.getExternalId,
               module,
+              selfType,
               args,
-              sourceTypeName,
-              doc,
-              typeSignature
+              doc
             )
             go(tree += Tree.Node(conversion, Vector()), scope)
 
@@ -286,20 +289,25 @@ final class SuggestionBuilder[A: IndexedSource](
   private def buildConversion(
     externalId: Option[IR.ExternalId],
     module: QualifiedName,
+    selfType: Option[QualifiedName],
     args: Seq[DefinitionArgument],
-    sourceTypeName: String,
-    doc: Option[String],
-    typeSignature: Option[TypeSignatures.Metadata]
+    doc: Option[String]
   ): Suggestion.Conversion = {
-    val typeSig = buildTypeSignatureFromMetadata(typeSignature)
-    val (methodArgs, returnTypeDef) =
-      buildFunctionArguments(args, typeSig)
+    val methodArgs =
+      args.map { arg =>
+        buildTypeSignatureFromMetadata(
+          arg.getMetadata(TypeSignatures)
+        ).headOption
+          .map(buildTypedArgument(arg, _))
+          .getOrElse(buildArgument(arg))
+      }.tail
+
     Suggestion.Conversion(
       externalId    = externalId,
       module        = module.toString,
       arguments     = methodArgs,
-      selfType      = sourceTypeName,
-      returnType    = buildReturnType(returnTypeDef),
+      selfType      = methodArgs.head.reprType,
+      returnType    = selfType.fold(Any)(_.toString),
       documentation = doc
     )
   }
@@ -725,7 +733,9 @@ final class SuggestionBuilder[A: IndexedSource](
     expr match {
       case Literal.Number(_, value, _, _, _) => Some(value)
       case Literal.Text(text, _, _, _)       => Some(text)
-      case _                                 => None
+      case Application.Prefix(name, path, _, _, _, _) =>
+        Some(path.map(_.value.showCode()).mkString(".") + "." + name.showCode())
+      case other => Some(other.showCode())
     }
 
   /** Build scope from the location. */
@@ -745,9 +755,6 @@ final class SuggestionBuilder[A: IndexedSource](
 
 object SuggestionBuilder {
 
-  /** TODO[DB] enable conversions when they get the runtime support. */
-  private val ConversionsEnabled: Boolean = false
-
   /** Creates the suggestion builder for a module.
     *
     * @param module the module to index

engine/runtime/src/test/scala/org/enso/compiler/test/context/SuggestionBuilderTest.scala

@@ -857,14 +857,14 @@ class SuggestionBuilderTest extends AnyWordSpecLike with Matchers {
     }
 
     "build conversion method for simple type" in {
-      pending
-
       val code =
-        """type MyAtom a
+        """import Standard.Base.Data.Numbers
+          |
+          |type Foo
+          |    Value foo
           |
           |## My conversion
-          |MyAtom.from : Number -> MyAtom
-          |MyAtom.from a = MyAtom a
+          |Foo.from (that:Numbers.Number) = Foo.Value a
           |""".stripMargin
       val module = code.preprocessModule
 
@@ -875,29 +875,40 @@ class SuggestionBuilderTest extends AnyWordSpecLike with Matchers {
             Suggestion.Type(
               externalId    = None,
               module        = "Unnamed.Test",
-              name       = "MyType",
-              params = Seq(
-                Suggestion
-                  .Argument("a", SuggestionBuilder.Any, false, false, None)
-              ),
-              returnType    = "Unnamed.Test.MyType",
+              name          = "Foo",
+              params        = Seq(),
+              returnType    = "Unnamed.Test.Foo",
               parentType    = Some(SuggestionBuilder.Any),
               documentation = None
             ),
             Vector()
           ),
           Tree.Node(
-            Suggestion.DefinedMethod(
+            Suggestion.Constructor(
               externalId = None,
               module     = "Unnamed.Test",
-              name       = "a",
+              name       = "Value",
+              arguments = Seq(
+                Suggestion
+                  .Argument("foo", SuggestionBuilder.Any, false, false, None)
+              ),
+              returnType    = "Unnamed.Test.Foo",
+              documentation = None,
+              annotations   = Seq()
+            ),
+            Vector()
+          ),
+          Tree.Node(
+            Suggestion.Getter(
+              externalId = None,
+              module     = "Unnamed.Test",
+              name       = "foo",
               arguments = List(
                 Suggestion
-                  .Argument("self", "Unnamed.Test.MyType", false, false, None)
+                  .Argument("self", "Unnamed.Test.Foo", false, false, None)
               ),
-              selfType      = "Unnamed.Test.MyType",
+              selfType      = "Unnamed.Test.Foo",
               returnType    = SuggestionBuilder.Any,
-              isStatic      = false,
               documentation = None,
               annotations   = Seq()
             ),
@@ -908,10 +919,16 @@ class SuggestionBuilderTest extends AnyWordSpecLike with Matchers {
               externalId = None,
               module     = "Unnamed.Test",
               arguments = Seq(
-                Suggestion.Argument("a", "Number", false, false, None)
+                Suggestion.Argument(
+                  "that",
+                  "Standard.Base.Data.Numbers.Number",
+                  false,
+                  false,
+                  None
+                )
               ),
-              returnType    = "Unnamed.Test.MyType",
-              selfType      = "Number",
+              selfType      = "Standard.Base.Data.Numbers.Number",
+              returnType    = "Unnamed.Test.Foo",
               documentation = Some(" My conversion")
             ),
             Vector()
@@ -920,21 +937,14 @@ class SuggestionBuilderTest extends AnyWordSpecLike with Matchers {
       )
     }
 
-    "build conversion method for complex type" in {
-      pending
+    "build conversion method with extra arguments" in {
       val code =
-        """type MyMaybe
-          |    Some a
-          |    None
+        """import Standard.Base.Data.Numbers
           |
-          |type New
-          |    Newtype x
+          |type Foo
+          |    Value foo bar
           |
-          |## My conversion method
-          |New.from : MyMaybe -> New
-          |New.from opt = case opt of
-          |    Some a -> Newtype a
-          |    None -> Newtype 0
+          |Foo.from (that:Numbers.Number) other=1 = Foo.Value that other
           |""".stripMargin
       val module = code.preprocessModule
 
@@ -945,9 +955,9 @@ class SuggestionBuilderTest extends AnyWordSpecLike with Matchers {
             Suggestion.Type(
               externalId    = None,
               module        = "Unnamed.Test",
-              name          = "MyMaybe",
+              name          = "Foo",
               params        = Seq(),
-              returnType    = "Unnamed.Test.MyMaybe",
+              returnType    = "Unnamed.Test.Foo",
               parentType    = Some(SuggestionBuilder.Any),
               documentation = None
             ),
@@ -957,85 +967,46 @@ class SuggestionBuilderTest extends AnyWordSpecLike with Matchers {
             Suggestion.Constructor(
               externalId = None,
               module     = "Unnamed.Test",
-              name       = "Some",
+              name       = "Value",
               arguments = Seq(
                 Suggestion
-                  .Argument("a", SuggestionBuilder.Any, false, false, None)
+                  .Argument("foo", SuggestionBuilder.Any, false, false, None),
+                Suggestion
+                  .Argument("bar", SuggestionBuilder.Any, false, false, None)
               ),
-              returnType    = "Unnamed.Test.MyMaybe",
+              returnType    = "Unnamed.Test.Foo",
               documentation = None,
               annotations   = Seq()
             ),
             Vector()
           ),
           Tree.Node(
-            Suggestion.DefinedMethod(
+            Suggestion.Getter(
               externalId = None,
               module     = "Unnamed.Test",
-              name       = "a",
+              name       = "foo",
               arguments = List(
                 Suggestion
-                  .Argument("self", "Unnamed.Test.MyMaybe", false, false, None)
+                  .Argument("self", "Unnamed.Test.Foo", false, false, None)
               ),
-              selfType      = "Unnamed.Test.MyMaybe",
+              selfType      = "Unnamed.Test.Foo",
               returnType    = SuggestionBuilder.Any,
-              isStatic      = false,
               documentation = None,
               annotations   = Seq()
             ),
             Vector()
           ),
           Tree.Node(
-            Suggestion.Constructor(
+            Suggestion.Getter(
               externalId = None,
               module     = "Unnamed.Test",
-              name          = "None",
-              arguments     = Seq(),
-              returnType    = "Unnamed.Test.None",
-              documentation = None,
-              annotations   = Seq()
-            ),
-            Vector()
-          ),
-          Tree.Node(
-            Suggestion.Type(
-              externalId    = None,
-              module        = "Unnamed.Test",
-              name          = "New",
-              params        = Seq(),
-              returnType    = "Unnamed.Test.New",
-              parentType    = Some(SuggestionBuilder.Any),
-              documentation = None
-            ),
-            Vector()
-          ),
-          Tree.Node(
-            Suggestion.Constructor(
-              externalId = None,
-              module     = "Unnamed.Test",
-              name       = "Newtype",
-              arguments = Seq(
-                Suggestion
-                  .Argument("x", SuggestionBuilder.Any, false, false, None)
-              ),
-              returnType    = "Unnamed.Test.New",
-              documentation = None,
-              annotations   = Seq()
-            ),
-            Vector()
-          ),
-          Tree.Node(
-            Suggestion.DefinedMethod(
-              externalId = None,
-              module     = "Unnamed.Test",
-              name       = "x",
+              name       = "bar",
               arguments = List(
                 Suggestion
-                  .Argument("self", "Unnamed.Test.New", false, false, None)
+                  .Argument("self", "Unnamed.Test.Foo", false, false, None)
               ),
-              selfType      = "Unnamed.Test.New",
+              selfType      = "Unnamed.Test.Foo",
               returnType    = SuggestionBuilder.Any,
-              isStatic      = false,
               documentation = None,
               annotations   = Seq()
             ),
@@ -1046,12 +1017,138 @@ class SuggestionBuilderTest extends AnyWordSpecLike with Matchers {
               externalId = None,
               module     = "Unnamed.Test",
               arguments = Seq(
-                Suggestion
-                  .Argument("opt", "Unnamed.Test.MyMaybe", false, false, None)
+                Suggestion.Argument(
+                  "that",
+                  "Standard.Base.Data.Numbers.Number",
+                  false,
+                  false,
+                  None
                 ),
-              returnType    = "Unnamed.Test.MyType",
-              selfType      = "Unnamed.Test.MyMaybe",
-              documentation = Some(" My conversion method")
+                Suggestion
+                  .Argument(
+                    "other",
+                    SuggestionBuilder.Any,
+                    false,
+                    true,
+                    Some("1")
+                  )
+              ),
+              selfType      = "Standard.Base.Data.Numbers.Number",
+              returnType    = "Unnamed.Test.Foo",
+              documentation = None
+            ),
+            Vector()
+          )
+        )
+      )
+    }
+
+    "build conversion method with extra typed arguments" in {
+      val code =
+        """import Standard.Base.Data.Numbers
+          |from Standard.Base.Data.Boolean import Boolean
+          |
+          |type Foo
+          |    Value foo bar
+          |
+          |Foo.from (that:Numbers.Number) (other:Boolean=Boolean.True) = Foo.Value that other
+          |""".stripMargin
+      val module = code.preprocessModule
+
+      build(code, module) shouldEqual Tree.Root(
+        Vector(
+          ModuleNode,
+          Tree.Node(
+            Suggestion.Type(
+              externalId    = None,
+              module        = "Unnamed.Test",
+              name          = "Foo",
+              params        = Seq(),
+              returnType    = "Unnamed.Test.Foo",
+              parentType    = Some(SuggestionBuilder.Any),
+              documentation = None
+            ),
+            Vector()
+          ),
+          Tree.Node(
+            Suggestion.Constructor(
+              externalId = None,
+              module     = "Unnamed.Test",
+              name       = "Value",
+              arguments = Seq(
+                Suggestion
+                  .Argument("foo", SuggestionBuilder.Any, false, false, None),
+                Suggestion
+                  .Argument("bar", SuggestionBuilder.Any, false, false, None)
+              ),
+              returnType    = "Unnamed.Test.Foo",
+              documentation = None,
+              annotations   = Seq()
+            ),
+            Vector()
+          ),
+          Tree.Node(
+            Suggestion.Getter(
+              externalId = None,
+              module     = "Unnamed.Test",
+              name       = "foo",
+              arguments = List(
+                Suggestion
+                  .Argument("self", "Unnamed.Test.Foo", false, false, None)
+              ),
+              selfType      = "Unnamed.Test.Foo",
+              returnType    = SuggestionBuilder.Any,
+              documentation = None,
+              annotations   = Seq()
+            ),
+            Vector()
+          ),
+          Tree.Node(
+            Suggestion.Getter(
+              externalId = None,
+              module     = "Unnamed.Test",
+              name       = "bar",
+              arguments = List(
+                Suggestion
+                  .Argument("self", "Unnamed.Test.Foo", false, false, None)
+              ),
+              selfType      = "Unnamed.Test.Foo",
+              returnType    = SuggestionBuilder.Any,
+              documentation = None,
+              annotations   = Seq()
+            ),
+            Vector()
+          ),
+          Tree.Node(
+            Suggestion.Conversion(
+              externalId = None,
+              module     = "Unnamed.Test",
+              arguments = Seq(
+                Suggestion.Argument(
+                  "that",
+                  "Standard.Base.Data.Numbers.Number",
+                  false,
+                  false,
+                  None
+                ),
+                Suggestion
+                  .Argument(
+                    "other",
+                    "Standard.Base.Data.Boolean.Boolean",
+                    false,
+                    true,
+                    Some("Boolean.True"),
+                    Some(
+                      List(
+                        "Standard.Base.Data.Boolean.Boolean.True",
+                        "Standard.Base.Data.Boolean.Boolean.False"
+                      )
+                    )
+                  )
+              ),
+              selfType      = "Standard.Base.Data.Numbers.Number",
+              returnType    = "Unnamed.Test.Foo",
+              documentation = None
             ),
             Vector()
           )