the C runtime and the Python binding now have an API for parser evaluation. The API computes PARSEVAL and Exact Match for a given tree. As a side effect the abstract trees in Python are now compared for equality by value and not by reference

src/runtime/c/pgf/pgf.h

@@ -116,6 +116,10 @@ pgf_linearize(PgfConcr* concr, PgfExpr expr, GuWriter* wtr, GuExn* err);
 PgfExprEnum*
 pgf_parse(PgfConcr* concr, PgfCId cat, PgfLexer *lexer, GuPool* pool);
 
+bool
+pgf_parseval(PgfConcr* concr, PgfExpr expr, PgfCId cat, 
+             double *precision, double *recall, double *exact);
+                    
 PgfExprEnum*
 pgf_generate(PgfPGF* pgf, PgfCId cat, GuPool* pool);