libpgf: a new implementation for literals which also allows custom literals. the same mechanism is now used for the metavariables

src/runtime/c/pgf/literals.h

@@ -0,0 +1,15 @@
+#ifndef PGF_LITERALS_H_
+#define PGF_LITERALS_H_
+
+#include <pgf/data.h>
+
+PgfCallbacksMap*
+pgf_new_callbacks_map(PgfConcr* concr, GuPool *pool);
+
+// literal for named entities recognition
+extern PgfLiteralCallback pgf_nerc_literal_callback;
+
+PgfCCat*
+pgf_literal_cat(PgfConcr* concr, PgfLiteral lit);
+
+#endif // PGF_LITERALS_H_