Initial revision

1 files changed, 78 insertions, 0 deletions

diff --git a/Include/grammar.h b/Include/grammar.h
new file mode 100644
index 0000000..423d862
--- /dev/null
+++ b/Include/grammar.h
@@ -0,0 +1,78 @@
+/* Grammar interface */
+
+#include "bitset.h" /* Sigh... */
+
+/* A label of an arc */
+
+typedef struct _label {
+	int	lb_type;
+	char	*lb_str;
+} label;
+
+#define EMPTY 0		/* Label number 0 is by definition the empty label */
+
+/* A list of labels */
+
+typedef struct _labellist {
+	int	ll_nlabels;
+	label	*ll_label;
+} labellist;
+
+/* An arc from one state to another */
+
+typedef struct _arc {
+	short		a_lbl;		/* Label of this arc */
+	short		a_arrow;	/* State where this arc goes to */
+} arc;
+
+/* A state in a DFA */
+
+typedef struct _state {
+	int		 s_narcs;
+	arc		*s_arc;		/* Array of arcs */
+	
+	/* Optional accelerators */
+	int		 s_lower;	/* Lowest label index */
+	int		 s_upper;	/* Highest label index */
+	int		*s_accel;	/* Accelerator */
+	int		 s_accept;	/* Nonzero for accepting state */
+} state;
+
+/* A DFA */
+
+typedef struct _dfa {
+	int		 d_type;	/* Non-terminal this represents */
+	char		*d_name;	/* For printing */
+	int		 d_initial;	/* Initial state */
+	int		 d_nstates;
+	state		*d_state;	/* Array of states */
+	bitset		 d_first;
+} dfa;
+
+/* A grammar */
+
+typedef struct _grammar {
+	int		 g_ndfas;
+	dfa		*g_dfa;		/* Array of DFAs */
+	labellist	 g_ll;
+	int		 g_start;	/* Start symbol of the grammar */
+	int		 g_accel;	/* Set if accelerators present */
+} grammar;
+
+/* FUNCTIONS */
+
+grammar *newgrammar PROTO((int start));
+dfa *adddfa PROTO((grammar *g, int type, char *name));
+int addstate PROTO((dfa *d));
+void addarc PROTO((dfa *d, int from, int to, int lbl));
+dfa *finddfa PROTO((grammar *g, int type));
+char *typename PROTO((grammar *g, int lbl));
+
+int addlabel PROTO((labellist *ll, int type, char *str));
+int findlabel PROTO((labellist *ll, int type, char *str));
+char *labelrepr PROTO((label *lb));
+void translatelabels PROTO((grammar *g));
+
+void addfirstsets PROTO((grammar *g));
+
+void addaccellerators PROTO((grammar *g));