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