decoder: Implement reference targets for List

decoder/expr_list.go

@@ -10,8 +10,3 @@ type List struct {
 	cons    schema.List
 	pathCtx *PathContext
 }
-
-func (l List) ReferenceTargets(ctx context.Context, addr lang.Address, addrCtx AddressContext) reference.Targets {
-	// TODO
-	return nil
-}

decoder/expr_list_ref_targets.go

@@ -0,0 +1,36 @@
+package decoder
+
+import (
+	"context"
+
+	"github.com/hashicorp/hcl-lang/lang"
+	"github.com/hashicorp/hcl-lang/reference"
+	"github.com/hashicorp/hcl/v2/hclsyntax"
+	"github.com/zclconf/go-cty/cty"
+)
+
+func (list List) ReferenceTargets(ctx context.Context, addr lang.Address, addrCtx AddressContext) reference.Targets {
+	eType, ok := list.expr.(*hclsyntax.TupleConsExpr)
+	if !ok {
+		return reference.Targets{}
+	}
+
+	if len(eType.Exprs) == 0 || list.cons.Elem == nil {
+		return reference.Targets{}
+	}
+
+	targets := make(reference.Targets, 0)
+
+	for i, elemExpr := range eType.Exprs {
+		expr := newExpression(list.pathCtx, elemExpr, list.cons.Elem)
+		if e, ok := expr.(ReferenceTargetsExpression); ok {
+			elemAddr := addr.Copy()
+			elemAddr = append(elemAddr, lang.IndexStep{
+				Key: cty.NumberIntVal(int64(i)),
+			})
+			targets = append(targets, e.ReferenceTargets(ctx, elemAddr, addrCtx)...)
+		}
+	}
+
+	return targets
+}