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diff --git a/src/parser.h b/src/parser.h
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+/***********************************************************
+Copyright 1991 by Stichting Mathematisch Centrum, Amsterdam, The
+Netherlands.
+
+ All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted,
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in
+supporting documentation, and that the names of Stichting Mathematisch
+Centrum or CWI not be used in advertising or publicity pertaining to
+distribution of the software without specific, written prior permission.
+
+STICHTING MATHEMATISCH CENTRUM DISCLAIMS ALL WARRANTIES WITH REGARD TO
+THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH CENTRUM BE LIABLE
+FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+******************************************************************/
+
+/* Parser interface */
+
+#define MAXSTACK 100
+
+typedef struct _stackentry {
+ int s_state; /* State in current DFA */
+ dfa *s_dfa; /* Current DFA */
+ struct _node *s_parent; /* Where to add next node */
+} stackentry;
+
+typedef struct _stack {
+ stackentry *s_top; /* Top entry */
+ stackentry s_base[MAXSTACK];/* Array of stack entries */
+ /* NB The stack grows down */
+} stack;
+
+typedef struct {
+ struct _stack p_stack; /* Stack of parser states */
+ struct _grammar *p_grammar; /* Grammar to use */
+ struct _node *p_tree; /* Top of parse tree */
+} parser_state;
+
+parser_state *newparser PROTO((struct _grammar *g, int start));
+void delparser PROTO((parser_state *ps));
+int addtoken PROTO((parser_state *ps, int type, char *str, int lineno));
+void addaccelerators PROTO((grammar *g));