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/* Grammar interface */

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#ifndef Py_GRAMMAR_H

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#define Py_GRAMMAR_H

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#ifdef __cplusplus

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extern "C" {

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#endif

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

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/* A label of an arc */

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typedef struct {

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int lb_type;

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char *lb_str;

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} label;

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#define EMPTY 0 /* Label number 0 is by definition the empty label */

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/* A list of labels */

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typedef struct {

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int ll_nlabels;

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label *ll_label;

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} labellist;

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/* An arc from one state to another */

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typedef struct {

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short a_lbl; /* Label of this arc */

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

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} arc;

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/* A state in a DFA */

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typedef struct {

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int s_narcs;

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arc *s_arc; /* Array of arcs */

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/* Optional accelerators */

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int s_lower; /* Lowest label index */

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int s_upper; /* Highest label index */

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int *s_accel; /* Accelerator */

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int s_accept; /* Nonzero for accepting state */

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} state;

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/* A DFA */

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typedef struct {

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int d_type; /* Non-terminal this represents */

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char *d_name; /* For printing */

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int d_initial; /* Initial state */

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int d_nstates;

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state *d_state; /* Array of states */

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bitset d_first;

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} dfa;

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/* A grammar */

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typedef struct {

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int g_ndfas;

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dfa *g_dfa; /* Array of DFAs */

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labellist g_ll;

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int g_start; /* Start symbol of the grammar */

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int g_accel; /* Set if accelerators present */

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} grammar;

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/* FUNCTIONS */

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grammar *newgrammar(int start);

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void freegrammar(grammar *g);

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

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int addstate(dfa *d);

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

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

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

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

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const char *PyGrammar_LabelRepr(label *lb);

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void translatelabels(grammar *g);

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void addfirstsets(grammar *g);

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void PyGrammar_AddAccelerators(grammar *g);

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void PyGrammar_RemoveAccelerators(grammar *);

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

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

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#ifdef __cplusplus

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}

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#endif

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#endif /* !Py_GRAMMAR_H */

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