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/* 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));
void printgrammar PROTO((grammar *g, FILE *fp));
void printnonterminals PROTO((grammar *g, FILE *fp));
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