mirror of
https://github.com/python/cpython.git
synced 2024-12-21 15:53:43 +08:00
94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
|
|
/* 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);
|
|
dfa *adddfa(grammar *g, int type, 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, char *str);
|
|
int findlabel(labellist *ll, int type, char *str);
|
|
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 */
|