first rudimentary version of a parser

src/runtime/c/pgf/parser.h

@@ -0,0 +1,51 @@
+#ifndef PARSER_H
+#define PARSER_H
+
+class PGF_INTERNAL_DECL PgfParser : public PgfPhraseScanner, public PgfExprEnum {
+public:
+    PgfParser(ref<PgfConcrLincat> start, PgfText *sentence);
+
+	void space(size_t start, size_t end, PgfExn* err);
+    void start_matches(size_t end, PgfExn* err);
+    void match(ref<PgfConcrLin> lin, size_t seq_index, PgfExn* err);
+	void end_matches(size_t end, PgfExn* err);
+
+    PgfExpr fetch(PgfDB *db, PgfUnmarshaller *u, prob_t *prob);
+
+    virtual ~PgfParser();
+
+private:
+    class CFGCat;
+    class State;
+    class Item;
+    class ItemConts;
+    class Choice;
+    class Production;
+
+    class Result {
+    public:
+        virtual prob_t  prob() = 0;
+        virtual PgfExpr expr(PgfUnmarshaller *u) = 0;
+        virtual void    proceed(PgfParser *parser, PgfUnmarshaller *u) = 0;
+    };
+
+    class ResultExpr;
+    class ResultMeta;
+
+    class ResultComparator : std::less<Result*> {
+    public:
+        bool operator()(Result* &lhs, Result* &rhs) const 
+        {
+            return lhs->prob() > rhs->prob();
+        }
+    };
+
+    ref<PgfConcrLincat> start;
+    PgfText *sentence;
+
+    size_t last_choice_id;
+    
+    State *before, *after, *fetch_state;
+};
+
+#endif