70 lines
2.3 KiB
Text
70 lines
2.3 KiB
Text
#define LLALT 9999 /* Alternative is following */
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#define LLTERMINAL 1 /* Symbol is a terminal */
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#define LLNONTERMINAL 2 /* Symbol is a nonterminal */
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#define LLEORULE 0 /* No more alternatives */
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struct lhs { /* LHS of a rule */
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int nr; /* Nr of the nonterminal */
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struct symbol *rhs; /* Pointer to RHS */
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char first[LLSETSIZE]; /* First set */
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char follow[LLSETSIZE]; /* Follow set */
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char empty; /* Set if nonterminal produces empty */
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};
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struct symbol { /* Symbol in the RHS of a rule */
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int x; /* LLTERMINAL or LLNONTERMINAL */
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int nr; /* Nr of the symbol */
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struct symbol *link; /* Ptr to next rule with this symbol */
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struct symbol *next; /* Ptr to next symbol in this rule */
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struct lhs *lhs; /* Ptr to LHS */
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};
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struct terminal { /* Array with links to terminals in a */
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struct symbol *link; /* rule */
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};
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struct nonterminal { /* Array with links to nt's in a rule */
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struct symbol *link; /* and pointer to LHS's */
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struct lhs *rule;
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};
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struct stack_elt { /* Stack element */
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int flags; /* Some flags */
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int nr; /* Nr of symbol */
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int ref_count; /* Nr of predecessors */
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int hyp_ref_count; /* Temporary nr of predecessors */
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int matched; /* Nr of LHS trying to match */
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int nr_nexts; /* Nr of successors */
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struct edge *edges; /* Array of edges to other stack elt's*/
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};
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/* Possible flags in a stack element */
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#define LLHEAD 1 /* Stack element is a head */
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#define LLDUMMY 2 /* Stack element is substituted */
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#define LLGEN_SEARCH 8 /* Set by 'generate_heads()' */
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struct edge { /* Edges of a stack element */
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char flags; /* Some flags */
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struct stack_elt *ptr; /* Array with pointers to stack elt's */
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};
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/* Possible flags in an edge */
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#define LLLOOP 1 /* Belongs to a loop */
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#define LLLOOP_SEARCH 2 /* Used by 'loop()' */
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#define LLHYP_SEARCH 4 /* Used by 'hyp_run()' */
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#define PRINT_SEARCH 8 /* DEBUG */
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#define LLMARK_SEARCH 16 /* Used by 'mark_loop()' */
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#define LLYES 32
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#define LLNO 64
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#define LLEOSTACK -1 /* Indicates last element of a stack */
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#define LLHEADS_BUF_INCR 10 /* Nr of elements the buffer will be */
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#define LLCLEANUP_BUF_INCR 25 /* increased by */
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#define LL_VIS_INCR 200
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/* Macro's to manipulate bit sets */
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#define LLIN(a, i) ((a)[(i)/8] & (1 << ((i) % 8)))
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#define LLPUTIN(a, i) ((a)[(i)/8] |= (1 << ((i) % 8)))
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