晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //usr/include/python2.7/grammar.h
/* 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, 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 */

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