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/* Grammar interface */

#ifndef Py_GRAMMAR_H

#define Py_GRAMMAR_H

#ifdef __cplusplus

extern "C" {

#endif

#include "bitset.h" /* Sigh... */

/* A label of an arc */

typedef struct {

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 {

int ll_nlabels;

label *ll_label;

} labellist;

/* An arc from one state to another */

typedef struct {

short a_lbl; /* Label of this arc */

short a_arrow; /* State where this arc goes to */

} arc;

/* A state in a DFA */

typedef struct {

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 {

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 {

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(int start);

void freegrammar(grammar *g);

dfa *adddfa(grammar *g, int type, const char *name);

int addstate(dfa *d);

void addarc(dfa *d, int from, int to, int lbl);

dfa *PyGrammar_FindDFA(grammar *g, int type);

int addlabel(labellist *ll, int type, const char *str);

int findlabel(labellist *ll, int type, const char *str);

const char *PyGrammar_LabelRepr(label *lb);

void translatelabels(grammar *g);

void addfirstsets(grammar *g);

void PyGrammar_AddAccelerators(grammar *g);

void PyGrammar_RemoveAccelerators(grammar *);

void printgrammar(grammar *g, FILE *fp);

void printnonterminals(grammar *g, FILE *fp);

#ifdef __cplusplus

}

#endif

#endif /* !Py_GRAMMAR_H */