xo-reader2: + intern_string() forwarding methods in parser/reader

include/xo/reader2/SchematikaParser.hpp

@@ -220,6 +220,10 @@ namespace xo {
              **/
             void begin_batch_session();
 
+            /** intern string @p str in global string table
+             **/
+            const DUniqueString * intern_string(std::string_view str);
+
             /** include next token @p tk and increment parser state.
              *
              *  @param tk  next input token

include/xo/reader2/SchematikaReader.hpp

@@ -78,6 +78,10 @@ namespace xo {
              **/
             void begin_batch_session();
 
+            /** intern string @p str in global string table
+             **/
+            const DUniqueString * intern_string(std::string_view str);
+
             /** consume input @p input_cstr **/
             const ReaderResult & read_expr(span_type input_span, bool eof);
 

src/reader2/SchematikaParser.cpp

@@ -81,6 +81,12 @@ namespace xo {
             DToplevelSeqSsm::establish_batch(psm_.parser_alloc(), &psm_);
         }
 
+        const DUniqueString *
+        SchematikaParser::intern_string(std::string_view str)
+        {
+            return psm_.intern_string(str);
+        }
+
         const ParserResult &
         SchematikaParser::on_token(const token_type & tk)
         {

src/reader2/SchematikaReader.cpp

@@ -58,6 +58,12 @@ namespace xo {
         // TODO:
         // Schematika::end_interactive_session()
 
+        const DUniqueString *
+        SchematikaReader::intern_string(std::string_view str)
+        {
+            return parser_.intern_string(str);
+        }
+
         const ReaderResult &
         SchematikaReader::read_expr(span_type input_ext, bool eof)
         {