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