feat: add "$expand-macro" macro

Author: tyru

dsl/op/expand_macro.go

@@ -0,0 +1,31 @@
+package op
+
+import (
+	"context"
+
+	"github.com/vim-volt/volt/dsl/types"
+)
+
+func init() {
+	s := expandMacroOp("$expand-macro")
+	ExpandMacroOp = &s
+	macroMap[string(*ExpandMacroOp)] = ExpandMacroOp
+}
+
+type expandMacroOp string
+
+// ExpandMacroOp is "$expand-macro" operation
+var ExpandMacroOp *expandMacroOp
+
+// String returns "$expand-macro"
+func (*expandMacroOp) String() string {
+	return string(*ArrayOp)
+}
+
+// Execute executes "$expand-macro" operation
+func (*expandMacroOp) Expand(args []types.Value) (types.Value, func(), error) {
+	if err := signature(types.AnyValue).check(args); err != nil {
+		return nil, noRollback, err
+	}
+	return args[0].Eval(context.Background())
+}