xo-reader2: print TypeRef belonging to DVariabe

include/xo/expression2/TypeRef.hpp

@@ -7,6 +7,7 @@
 
 #include <xo/reflect/TypeDescr.hpp>
 #include <xo/flatstring/flatstring.hpp>
+#include <xo/indentlog/print/pretty.hpp>
 
 namespace xo {
     namespace scm {
@@ -22,6 +23,7 @@ namespace xo {
             using TypeDescr = xo::reflect::TypeDescr;
             using type_var = flatstring<20>;
             using prefix_type = flatstring<8>;
+            using ppindentinfo = xo::print::ppindentinfo;
 
         public:
             TypeRef() = default;
@@ -54,6 +56,9 @@ namespace xo {
             /** resolve TypeRef by supplying final type-description **/
             void resolve(TypeDescr td) noexcept { td_ = td; }
 
+            /** pretty-printer support **/
+            bool pretty(const ppindentinfo & ppii) const;
+
         private:
             /** unique (probably generated) name for type at this location **/
             type_var id_;
@@ -64,6 +69,18 @@ namespace xo {
             TypeDescr td_;
         };
     } /*namespace scm*/
+
+    namespace print {
+        /** pretty printer in <xo/indentlog/print/pretty.hpp> relies on this specialization
+         *  to handle TypeRef instances
+         **/
+        template <>
+        struct ppdetail<xo::scm::TypeRef> {
+            static inline bool print_pretty(const ppindentinfo & ppii, const xo::scm::TypeRef x) {
+                return x.pretty(ppii);
+            }
+        };
+    }
 } /*namespace xo*/
 
 /* end TypeRef.hpp */

src/expression2/DVariable.cpp

@@ -5,6 +5,7 @@
 
 #include "DVariable.hpp"
 #include "exprtype.hpp"
+#include <xo/indentlog/print/quoted.hpp>
 
 namespace xo {
     using xo::facet::typeseq;
@@ -38,6 +39,8 @@ namespace xo {
         bool
         DVariable::pretty(const ppindentinfo & ppii) const
         {
+            using xo::print::quot;
+
             auto name = (name_
                          ? std::string_view(*name_)
                          : std::string_view(""));
@@ -45,7 +48,8 @@ namespace xo {
             return ppii.pps()->pretty_struct
                        (ppii,
                         "DVariable",
-                        refrtag("name", name));
+                        refrtag("name", quot(name)),
+                        refrtag("typeref", typeref_));
         }
 
     } /*namespace scm*/

src/expression2/TypeRef.cpp

@@ -4,6 +4,8 @@
  **/
 
 #include "TypeRef.hpp"
+#include <xo/indentlog/print/pretty.hpp>
+#include <xo/indentlog/print/quoted.hpp>
 
 namespace xo {
     namespace scm {
@@ -62,6 +64,18 @@ namespace xo {
             return (td_ != nullptr);
         }
 
+        bool
+        TypeRef::pretty(const ppindentinfo & ppii) const
+        {
+            using xo::print::quot;
+
+            return ppii.pps()->pretty_struct
+                       (ppii,
+                        "TypeRef",
+                        refrtag("id", quot(id_)),
+                        refrtag("td", td_));
+        }
+
     } /*namespace scm*/
 } /*namespace xo*/