66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
#ifndef BURG_INCLUDED
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#define BURG_INCLUDED
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/* $Id$ */
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/* iburg.c: */
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extern void *alloc(int nbytes);
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typedef enum { TERM=1, NONTERM } Kind;
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typedef struct rule *Rule;
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typedef struct term *Term;
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struct term { /* terminals: */
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char *name; /* terminal name */
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Kind kind; /* TERM */
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int esn; /* external symbol number */
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int arity; /* operator arity */
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Term link; /* next terminal in esn order */
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Rule rules; /* rules whose pattern starts with term */
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};
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typedef struct nonterm *Nonterm;
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struct nonterm { /* non-terminals: */
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char *name; /* non-terminal name */
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Kind kind; /* NONTERM */
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int number; /* identifying number */
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int lhscount; /* # times nt appears in a rule lhs */
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int reached; /* 1 iff reached from start non-terminal */
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Rule rules; /* rules w/non-terminal on lhs */
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Rule chain; /* chain rules w/non-terminal on rhs */
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Nonterm link; /* next terminal in number order */
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};
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extern Nonterm nonterm(char *id);
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extern Term term(char *id, int esn);
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typedef struct tree *Tree;
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struct tree { /* tree patterns: */
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void *op; /* a terminal or non-terminal */
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Tree left, right; /* operands */
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int nterms; /* number of terminal nodes in this tree */
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};
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extern Tree tree(char *op, Tree left, Tree right);
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struct rule { /* rules: */
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Nonterm lhs; /* lefthand side non-terminal */
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Tree pattern; /* rule pattern */
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int ern; /* external rule number */
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int packed; /* packed external rule number */
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int cost; /* associated cost */
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Rule link; /* next rule in ern order */
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Rule next; /* next rule with same pattern root */
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Rule chain; /* next chain rule with same rhs */
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Rule decode; /* next rule with same lhs */
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Rule kids; /* next rule with same burm_kids pattern */
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};
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extern Rule rule(char *id, Tree pattern, int ern, int cost);
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extern int maxcost; /* maximum cost */
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/* gram.y: */
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void yyerror(char *fmt, ...);
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int yyparse(void);
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void yywarn(char *fmt, ...);
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extern int errcnt;
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extern FILE *infp;
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extern FILE *outfp;
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#endif
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