chore: support attaching arbitrary comments to types (#57)

Adds a new type SupportsComments for handling comments on top level declarations and field properties.

The original idea was to create an AST node for comments. This works well when constructing an AST, but makes traversing an AST more difficult. The comment nodes add extra unbounded levels of indirection.

This solution keeps the comments on the related type.

Author: Emyrk

bindings/ast.go

@@ -2,10 +2,7 @@ package bindings
 
 import (
 	"fmt"
-	"go/token"
 	"go/types"
-
-	"github.com/dop251/goja"
 )
 
 type Node interface {
@@ -47,12 +44,6 @@ func (i Identifier) Ref() string {
 	return i.Prefix + i.Name
 }
 
-// Source is the golang file that an entity is sourced from.
-type Source struct {
-	File     string
-	Position token.Position
-}
-
 type HeritageType string
 
 const (
@@ -76,26 +67,6 @@ func HeritageClauseExtends(args ...ExpressionType) *HeritageClause {
 	}
 }
 
-func (s Source) Comment(n *goja.Object) Comment {
-	return Comment{
-		SingleLine:      true,
-		Text:            fmt.Sprintf("From %s", s.File),
-		TrailingNewLine: false,
-		Node:            n,
-	}
-}
-
-type Comment struct {
-	// Single or multi-line comment
-	SingleLine      bool
-	Text            string
-	TrailingNewLine bool
-
-	Node *goja.Object
-}
-
-func (c *Comment) isNode() {}
-
 type Modifier string
 
 const (