Created a simple sub language example

tw1nk · Dec 13, 2020 · e3d61a8 · e3d61a8
1 parent bb6a60f
commit e3d61a8
Showing 1 changed file with 27 additions and 1 deletion.
diff --git a/example_test.go b/example_test.go
@@ -406,7 +406,7 @@ func (s *exampleCustomSelector) SelectGVal(ctx context.Context, k string) (inter
  return nil, nil
 }
 
-func ExampleCustomSelector() {
+func ExampleSelector() {
  lang := gval.Base()
  value, err := lang.Evaluate(
  "myStruct.hidden",
@@ -422,3 +422,29 @@ func ExampleCustomSelector() {
  // Output:
  // hello world
 }
+
+func parseSub(ctx context.Context, p *gval.Parser) (gval.Evaluable, error) {
+ return p.ParseSublanguage(ctx, subLang)
+}
+
+var (
+ superLang = gval.NewLanguage(
+ gval.PrefixExtension('$', parseSub),
+ )
+ subLang = gval.NewLanguage(
+ gval.Init(func(ctx context.Context, p *gval.Parser) (gval.Evaluable, error) { return p.Const("hello world"), nil }),
+ )
+)
+
+func ExampleParser_ParseSublanguage() {
+ value, err := superLang.Evaluate("$", nil)
+
+ if err != nil {
+ fmt.Println(err)
+ }
+
+ fmt.Println(value)
+
+ // Output:
+ // hello world
+}