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/*
* dates.lex: An example of using start states to
* distinguish between different date formats.
*/
%{
#include <ctype.h>
char month[20],dow[20],day[20],year[20];
%}
skip of|the|[ \t,]*
mon (mon(day)?)
tue (tue(sday)?)
wed (wed(nesday)?)
thu (thu(rsday)?)
fri (fri(day)?)
sat (sat(urday)?)
sun (sun(day)?)
day_of_the_week ({mon}|{tue}|{wed}|{thu}|{fri}|{sat}|{sun})
jan (jan(uary)?)
feb (feb(ruary)?)
mar (mar(ch)?)
apr (apr(il)?)
may (may)
jun (jun(e)?)
jul (jul(y)?)
aug (aug(ust)?)
sep (sep(tember)?)
oct (oct(ober)?)
nov (nov(ember)?)
dec (dec(ember)?)
first_half ({jan}|{feb}|{mar}|{apr}|{may}|{jun})
second_half ({jul}|{aug}|{sep}|{oct}|{nov}|{dec})
month {first_half}|{second_half}
nday [1-9]|[1-2][0-9]|3[0-1]
nmonth [1-9]|1[0-2]
nyear [0-9]{1,4}
year_ext (ad|AD|bc|BC)?
day_ext (st|nd|rd|th)?
%s LONG SHORT
%s DAY DAY_FIRST YEAR_FIRST YEAR_LAST YFMONTH YLMONTH
%%
/* the default is month-day-year */
<LONG>{day_of_the_week} strcpy(dow,yytext);
<LONG>{month} strcpy(month,yytext); BEGIN(DAY);
/* handle the form: day-month-year */
<LONG>{nday}{day_ext} strcpy(day,yytext); BEGIN(DAY_FIRST);
<DAY_FIRST>{month} strcpy(month,yytext); BEGIN(LONG);
<DAY>{nday}{day_ext} strcpy(day,yytext); BEGIN(LONG);
<LONG>{nyear}{year_ext} {
printf("Long:\n");
printf(" DOW : %s \n",dow);
printf(" Day : %s \n",day);
printf(" Month : %s \n",month);
printf(" Year : %s \n",yytext);
strcpy(dow,"");
strcpy(day,"");
strcpy(month,"");
}
/* handle dates of the form: day-month-year */
<SHORT>{nday} strcpy(day,yytext); BEGIN(YEAR_LAST);
<YEAR_LAST>{nmonth} strcpy(month,yytext);BEGIN(YLMONTH);
<YLMONTH>{nyear} strcpy(year,yytext); BEGIN(SHORT);
/* handle dates of the form: year-month-day */
<SHORT>{nyear} strcpy(year,yytext); BEGIN(YEAR_FIRST);
<YEAR_FIRST>{nmonth} strcpy(month,yytext);BEGIN(YFMONTH);
<YFMONTH>{nday} strcpy(day,yytext); BEGIN(SHORT);
<SHORT>\n {
printf("Short:\n");
printf(" Day : %s \n",day);
printf(" Month : %s \n",month);
printf(" Year : %s \n",year);
strcpy(year,"");
strcpy(day,"");
strcpy(month,"");
}
long\n BEGIN(LONG);
short\n BEGIN(SHORT);
{skip}*
\n
.
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