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/share/doc/at/timespec
/* 
 * Abbreviated version of the yacc grammar used by at(1).
 */

%token  <charval> DOTTEDDATE
%token  <charval> HYPHENDATE
%token  <charval> HOURMIN
%token  <charval> INT1DIGIT
%token  <charval> INT2DIGIT
%token  <charval> INT4DIGIT
%token  <charval> INT5_8DIGIT
%token  <charval> INT
%token  NOW
%token  AM PM
%token  NOON MIDNIGHT TEATIME
%token  SUN MON TUE WED THU FRI SAT
%token  TODAY TOMORROW
%token  NEXT
%token  MINUTE HOUR DAY WEEK MONTH YEAR
%token  JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC
%token  UTC

%type <charval> concatenated_date
%type <charval> hr24clock_hr_min
%type <charval> int1_2digit
%type <charval> int2_or_4digit
%type <charval> integer
%type <intval> inc_dec_period
%type <intval> inc_dec_number
%type <intval> day_of_week

%start timespec
%%
timespec        : spec_base
		| spec_base inc_or_dec
                ;

spec_base	: date
		| time
                | time date
                | NOW
		;

time		: time_base
		| time_base timezone_name
                ;

time_base	: hr24clock_hr_min
		| time_hour am_pm
		| time_hour_min
		| time_hour_min am_pm
		| NOON
                | MIDNIGHT
		| TEATIME
		;

hr24clock_hr_min: INT4DIGIT
		;

time_hour	: int1_2digit
		;

time_hour_min	: HOURMIN
		;

am_pm		: AM
		| PM
		;

timezone_name	: UTC
		;

date            : month_name day_number
                | month_name day_number year_number
                | month_name day_number ',' year_number
                | day_of_week
                | TODAY
                | TOMORROW
		| HYPHENDATE
		| DOTTEDDATE
		| day_number month_name
		| day_number month_name year_number
		| month_number '/' day_number '/' year_number
		| concatenated_date
                | NEXT inc_dec_period		
		| NEXT day_of_week
                ;

concatenated_date: INT5_8DIGIT
		;

month_name	: JAN | FEB | MAR | APR | MAY | JUN
		| JUL | AUG | SEP | OCT | NOV | DEC
		;

month_number	: int1_2digit
		;

day_number	: int1_2digit
		;

year_number	: int2_or_4digit
		;

day_of_week	: SUN | MON | TUE | WED | THU | FRI | SAT
		;

inc_or_dec	: increment | decrement
		;

increment       : '+' inc_dec_number inc_dec_period
                ;

decrement	: '-' inc_dec_number inc_dec_period
		;

inc_dec_number	: integer
		;

inc_dec_period	: MINUTE | HOUR | DAY | WEEK | MONTH | YEAR
		;

int1_2digit	: INT1DIGIT | INT2DIGIT
		;

int2_or_4digit	: INT2DIGIT | INT4DIGIT
		;

integer		: INT | INT1DIGIT | INT2DIGIT | INT4DIGIT | INT5_8DIGIT
		;

%%

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