fix: handlebars template exec function calling with kcl json value

kclvm/runtime/src/template/mod.rs

@@ -22,11 +22,11 @@ pub extern "C" fn kclvm_template_execute(
             .register_template_string("template", template)
             .expect("register template failed");
         let data = get_call_arg(args, kwargs, 1, Some("data")).unwrap_or(ValueRef::dict(None));
-        let data: HashMap<String, String> = HashMap::from_iter(
+        let data: HashMap<String, JsonValue> = HashMap::from_iter(
             data.as_dict_ref()
                 .values
                 .iter()
-                .map(|(k, v)| (k.to_string(), v.to_string())),
+                .map(|(k, v)| (k.to_string(), v.build_json(&Default::default()))),
         );
         let result = handlebars
             .render("template", &data)

kclvm/runtime/src/value/val_json.rs

@@ -438,7 +438,7 @@ impl ValueRef {
         writer.to_str().unwrap().to_string()
     }
 
-    fn build_json(&self, opt: &JsonEncodeOptions) -> JsonValue {
+    pub(crate) fn build_json(&self, opt: &JsonEncodeOptions) -> JsonValue {
         match &*self.rc.borrow() {
             crate::Value::undefined => JsonValue::Null,
             crate::Value::none => JsonValue::Null,

test/grammar/builtins/template/execute_2/main.k

@@ -0,0 +1,32 @@
+import template
+
+_data = {
+  name = "handlebars", 
+  v = [ { a = 1}, { a = 2}], 
+  c = { d = 5},
+  g = { b = [{ aa = { bb = 55}}, { aa = { bb = 66} } ] },
+  people = [ "Yehuda Katz", "Alan Johnson", "Charles Jolley" ]
+}
+
+content = template.execute("""\
+Hello world from {{name}}
+
+{{#each v}}
+{{this.a}}
+{{/each}}
+{{ c.d }}
+{{#each people}}
+{{ this }}
+{{/each}}
+{{#each g.b}}
+{{this.aa.bb}}
+{{/each}}
+""", _data)
+
+content_raw = template.execute("""\
+{{this.name}}
+{{this.v}}
+{{this.c}}
+{{this.g}}
+{{this.people}}
+""", _data) 

test/grammar/builtins/template/execute_2/stdout.golden

@@ -0,0 +1,17 @@
+content: |
+  Hello world from handlebars
+
+  1
+  2
+  5
+  Yehuda Katz
+  Alan Johnson
+  Charles Jolley
+  55
+  66
+content_raw: |
+  handlebars
+  [[object], [object]]
+  [object]
+  [object]
+  [Yehuda Katz, Alan Johnson, Charles Jolley]