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author | rjohnson <rjohnson@noemail.net> | 1998-03-26 14:45:59 (GMT) |
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committer | rjohnson <rjohnson@noemail.net> | 1998-03-26 14:45:59 (GMT) |
commit | 26a76b6c669bbb7629454ffa56a7f3f501a86dae (patch) | |
tree | 6e8c9473978f6dab66c601e911721a7bd9d70b1b /generic/tclGetDate.y | |
parent | f91eedbd6219cd3648cf1085083990df5c0e77dd (diff) | |
download | tcl-26a76b6c669bbb7629454ffa56a7f3f501a86dae.zip tcl-26a76b6c669bbb7629454ffa56a7f3f501a86dae.tar.gz tcl-26a76b6c669bbb7629454ffa56a7f3f501a86dae.tar.bz2 |
Initial revision
FossilOrigin-Name: cacdd0f329872d67973970d74c6978730bc24baa
Diffstat (limited to 'generic/tclGetDate.y')
-rw-r--r-- | generic/tclGetDate.y | 958 |
1 files changed, 958 insertions, 0 deletions
diff --git a/generic/tclGetDate.y b/generic/tclGetDate.y new file mode 100644 index 0000000..1f4dce5 --- /dev/null +++ b/generic/tclGetDate.y @@ -0,0 +1,958 @@ +/* + * tclGetDate.y -- + * + * Contains yacc grammar for parsing date and time strings. + * The output of this file should be the file tclDate.c which + * is used directly in the Tcl sources. + * + * Copyright (c) 1992-1995 Karl Lehenbauer and Mark Diekhans. + * Copyright (c) 1995-1997 Sun Microsystems, Inc. + * + * See the file "license.terms" for information on usage and redistribution + * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + * + * SCCS: @(#) tclGetDate.y 1.34 97/02/03 14:53:54 + */ + +%{ +/* + * tclDate.c -- + * + * This file is generated from a yacc grammar defined in + * the file tclGetDate.y. It should not be edited directly. + * + * Copyright (c) 1992-1995 Karl Lehenbauer and Mark Diekhans. + * Copyright (c) 1995-1997 Sun Microsystems, Inc. + * + * See the file "license.terms" for information on usage and redistribution + * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + * + * SCCSID + */ + +#include "tclInt.h" +#include "tclPort.h" + +#ifdef MAC_TCL +# define EPOCH 1904 +# define START_OF_TIME 1904 +# define END_OF_TIME 2039 +#else +# define EPOCH 1970 +# define START_OF_TIME 1902 +# define END_OF_TIME 2037 +#endif + +/* + * The offset of tm_year of struct tm returned by localtime, gmtime, etc. + * I don't know how universal this is; K&R II, the NetBSD manpages, and + * ../compat/strftime.c all agree that tm_year is the year-1900. However, + * some systems may have a different value. This #define should be the + * same as in ../compat/strftime.c. + */ +#define TM_YEAR_BASE 1900 + +#define HOUR(x) ((int) (60 * x)) +#define SECSPERDAY (24L * 60L * 60L) + + +/* + * An entry in the lexical lookup table. + */ +typedef struct _TABLE { + char *name; + int type; + time_t value; +} TABLE; + + +/* + * Daylight-savings mode: on, off, or not yet known. + */ +typedef enum _DSTMODE { + DSTon, DSToff, DSTmaybe +} DSTMODE; + +/* + * Meridian: am, pm, or 24-hour style. + */ +typedef enum _MERIDIAN { + MERam, MERpm, MER24 +} MERIDIAN; + + +/* + * Global variables. We could get rid of most of these by using a good + * union as the yacc stack. (This routine was originally written before + * yacc had the %union construct.) Maybe someday; right now we only use + * the %union very rarely. + */ +static char *yyInput; +static DSTMODE yyDSTmode; +static time_t yyDayOrdinal; +static time_t yyDayNumber; +static int yyHaveDate; +static int yyHaveDay; +static int yyHaveRel; +static int yyHaveTime; +static int yyHaveZone; +static time_t yyTimezone; +static time_t yyDay; +static time_t yyHour; +static time_t yyMinutes; +static time_t yyMonth; +static time_t yySeconds; +static time_t yyYear; +static MERIDIAN yyMeridian; +static time_t yyRelMonth; +static time_t yyRelSeconds; + + +/* + * Prototypes of internal functions. + */ +static void yyerror _ANSI_ARGS_((char *s)); +static time_t ToSeconds _ANSI_ARGS_((time_t Hours, time_t Minutes, + time_t Seconds, MERIDIAN Meridian)); +static int Convert _ANSI_ARGS_((time_t Month, time_t Day, time_t Year, + time_t Hours, time_t Minutes, time_t Seconds, + MERIDIAN Meridia, DSTMODE DSTmode, time_t *TimePtr)); +static time_t DSTcorrect _ANSI_ARGS_((time_t Start, time_t Future)); +static time_t RelativeDate _ANSI_ARGS_((time_t Start, time_t DayOrdinal, + time_t DayNumber)); +static int RelativeMonth _ANSI_ARGS_((time_t Start, time_t RelMonth, + time_t *TimePtr)); +static int LookupWord _ANSI_ARGS_((char *buff)); +static int yylex _ANSI_ARGS_((void)); + +int +yyparse _ANSI_ARGS_((void)); +%} + +%union { + time_t Number; + enum _MERIDIAN Meridian; +} + +%token tAGO tDAY tDAYZONE tID tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT +%token tSEC_UNIT tSNUMBER tUNUMBER tZONE tEPOCH tDST + +%type <Number> tDAY tDAYZONE tMINUTE_UNIT tMONTH tMONTH_UNIT tDST +%type <Number> tSEC_UNIT tSNUMBER tUNUMBER tZONE +%type <Meridian> tMERIDIAN o_merid + +%% + +spec : /* NULL */ + | spec item + ; + +item : time { + yyHaveTime++; + } + | zone { + yyHaveZone++; + } + | date { + yyHaveDate++; + } + | day { + yyHaveDay++; + } + | rel { + yyHaveRel++; + } + | number + ; + +time : tUNUMBER tMERIDIAN { + yyHour = $1; + yyMinutes = 0; + yySeconds = 0; + yyMeridian = $2; + } + | tUNUMBER ':' tUNUMBER o_merid { + yyHour = $1; + yyMinutes = $3; + yySeconds = 0; + yyMeridian = $4; + } + | tUNUMBER ':' tUNUMBER tSNUMBER { + yyHour = $1; + yyMinutes = $3; + yyMeridian = MER24; + yyDSTmode = DSToff; + yyTimezone = - ($4 % 100 + ($4 / 100) * 60); + } + | tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid { + yyHour = $1; + yyMinutes = $3; + yySeconds = $5; + yyMeridian = $6; + } + | tUNUMBER ':' tUNUMBER ':' tUNUMBER tSNUMBER { + yyHour = $1; + yyMinutes = $3; + yySeconds = $5; + yyMeridian = MER24; + yyDSTmode = DSToff; + yyTimezone = - ($6 % 100 + ($6 / 100) * 60); + } + ; + +zone : tZONE tDST { + yyTimezone = $1; + yyDSTmode = DSTon; + } + | tZONE { + yyTimezone = $1; + yyDSTmode = DSToff; + } + | tDAYZONE { + yyTimezone = $1; + yyDSTmode = DSTon; + } + ; + +day : tDAY { + yyDayOrdinal = 1; + yyDayNumber = $1; + } + | tDAY ',' { + yyDayOrdinal = 1; + yyDayNumber = $1; + } + | tUNUMBER tDAY { + yyDayOrdinal = $1; + yyDayNumber = $2; + } + ; + +date : tUNUMBER '/' tUNUMBER { + yyMonth = $1; + yyDay = $3; + } + | tUNUMBER '/' tUNUMBER '/' tUNUMBER { + yyMonth = $1; + yyDay = $3; + yyYear = $5; + } + | tMONTH tUNUMBER { + yyMonth = $1; + yyDay = $2; + } + | tMONTH tUNUMBER ',' tUNUMBER { + yyMonth = $1; + yyDay = $2; + yyYear = $4; + } + | tUNUMBER tMONTH { + yyMonth = $2; + yyDay = $1; + } + | tEPOCH { + yyMonth = 1; + yyDay = 1; + yyYear = EPOCH; + } + | tUNUMBER tMONTH tUNUMBER { + yyMonth = $2; + yyDay = $1; + yyYear = $3; + } + ; + +rel : relunit tAGO { + yyRelSeconds = -yyRelSeconds; + yyRelMonth = -yyRelMonth; + } + | relunit + ; + +relunit : tUNUMBER tMINUTE_UNIT { + yyRelSeconds += $1 * $2 * 60L; + } + | tSNUMBER tMINUTE_UNIT { + yyRelSeconds += $1 * $2 * 60L; + } + | tMINUTE_UNIT { + yyRelSeconds += $1 * 60L; + } + | tSNUMBER tSEC_UNIT { + yyRelSeconds += $1; + } + | tUNUMBER tSEC_UNIT { + yyRelSeconds += $1; + } + | tSEC_UNIT { + yyRelSeconds++; + } + | tSNUMBER tMONTH_UNIT { + yyRelMonth += $1 * $2; + } + | tUNUMBER tMONTH_UNIT { + yyRelMonth += $1 * $2; + } + | tMONTH_UNIT { + yyRelMonth += $1; + } + ; + +number : tUNUMBER + { + if (yyHaveTime && yyHaveDate && !yyHaveRel) { + yyYear = $1; + } else { + yyHaveTime++; + if ($1 < 100) { + yyHour = 0; + yyMinutes = $1; + } else { + yyHour = $1 / 100; + yyMinutes = $1 % 100; + } + yySeconds = 0; + yyMeridian = MER24; + } + } +; + +o_merid : /* NULL */ { + $$ = MER24; + } + | tMERIDIAN { + $$ = $1; + } + ; + +%% + +/* + * Month and day table. + */ +static TABLE MonthDayTable[] = { + { "january", tMONTH, 1 }, + { "february", tMONTH, 2 }, + { "march", tMONTH, 3 }, + { "april", tMONTH, 4 }, + { "may", tMONTH, 5 }, + { "june", tMONTH, 6 }, + { "july", tMONTH, 7 }, + { "august", tMONTH, 8 }, + { "september", tMONTH, 9 }, + { "sept", tMONTH, 9 }, + { "october", tMONTH, 10 }, + { "november", tMONTH, 11 }, + { "december", tMONTH, 12 }, + { "sunday", tDAY, 0 }, + { "monday", tDAY, 1 }, + { "tuesday", tDAY, 2 }, + { "tues", tDAY, 2 }, + { "wednesday", tDAY, 3 }, + { "wednes", tDAY, 3 }, + { "thursday", tDAY, 4 }, + { "thur", tDAY, 4 }, + { "thurs", tDAY, 4 }, + { "friday", tDAY, 5 }, + { "saturday", tDAY, 6 }, + { NULL } +}; + +/* + * Time units table. + */ +static TABLE UnitsTable[] = { + { "year", tMONTH_UNIT, 12 }, + { "month", tMONTH_UNIT, 1 }, + { "fortnight", tMINUTE_UNIT, 14 * 24 * 60 }, + { "week", tMINUTE_UNIT, 7 * 24 * 60 }, + { "day", tMINUTE_UNIT, 1 * 24 * 60 }, + { "hour", tMINUTE_UNIT, 60 }, + { "minute", tMINUTE_UNIT, 1 }, + { "min", tMINUTE_UNIT, 1 }, + { "second", tSEC_UNIT, 1 }, + { "sec", tSEC_UNIT, 1 }, + { NULL } +}; + +/* + * Assorted relative-time words. + */ +static TABLE OtherTable[] = { + { "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 }, + { "yesterday", tMINUTE_UNIT, -1 * 24 * 60 }, + { "today", tMINUTE_UNIT, 0 }, + { "now", tMINUTE_UNIT, 0 }, + { "last", tUNUMBER, -1 }, + { "this", tMINUTE_UNIT, 0 }, + { "next", tUNUMBER, 2 }, +#if 0 + { "first", tUNUMBER, 1 }, +/* { "second", tUNUMBER, 2 }, */ + { "third", tUNUMBER, 3 }, + { "fourth", tUNUMBER, 4 }, + { "fifth", tUNUMBER, 5 }, + { "sixth", tUNUMBER, 6 }, + { "seventh", tUNUMBER, 7 }, + { "eighth", tUNUMBER, 8 }, + { "ninth", tUNUMBER, 9 }, + { "tenth", tUNUMBER, 10 }, + { "eleventh", tUNUMBER, 11 }, + { "twelfth", tUNUMBER, 12 }, +#endif + { "ago", tAGO, 1 }, + { "epoch", tEPOCH, 0 }, + { NULL } +}; + +/* + * The timezone table. (Note: This table was modified to not use any floating + * point constants to work around an SGI compiler bug). + */ +static TABLE TimezoneTable[] = { + { "gmt", tZONE, HOUR( 0) }, /* Greenwich Mean */ + { "ut", tZONE, HOUR( 0) }, /* Universal (Coordinated) */ + { "utc", tZONE, HOUR( 0) }, + { "wet", tZONE, HOUR( 0) } , /* Western European */ + { "bst", tDAYZONE, HOUR( 0) }, /* British Summer */ + { "wat", tZONE, HOUR( 1) }, /* West Africa */ + { "at", tZONE, HOUR( 2) }, /* Azores */ +#if 0 + /* For completeness. BST is also British Summer, and GST is + * also Guam Standard. */ + { "bst", tZONE, HOUR( 3) }, /* Brazil Standard */ + { "gst", tZONE, HOUR( 3) }, /* Greenland Standard */ +#endif + { "nft", tZONE, HOUR( 7/2) }, /* Newfoundland */ + { "nst", tZONE, HOUR( 7/2) }, /* Newfoundland Standard */ + { "ndt", tDAYZONE, HOUR( 7/2) }, /* Newfoundland Daylight */ + { "ast", tZONE, HOUR( 4) }, /* Atlantic Standard */ + { "adt", tDAYZONE, HOUR( 4) }, /* Atlantic Daylight */ + { "est", tZONE, HOUR( 5) }, /* Eastern Standard */ + { "edt", tDAYZONE, HOUR( 5) }, /* Eastern Daylight */ + { "cst", tZONE, HOUR( 6) }, /* Central Standard */ + { "cdt", tDAYZONE, HOUR( 6) }, /* Central Daylight */ + { "mst", tZONE, HOUR( 7) }, /* Mountain Standard */ + { "mdt", tDAYZONE, HOUR( 7) }, /* Mountain Daylight */ + { "pst", tZONE, HOUR( 8) }, /* Pacific Standard */ + { "pdt", tDAYZONE, HOUR( 8) }, /* Pacific Daylight */ + { "yst", tZONE, HOUR( 9) }, /* Yukon Standard */ + { "ydt", tDAYZONE, HOUR( 9) }, /* Yukon Daylight */ + { "hst", tZONE, HOUR(10) }, /* Hawaii Standard */ + { "hdt", tDAYZONE, HOUR(10) }, /* Hawaii Daylight */ + { "cat", tZONE, HOUR(10) }, /* Central Alaska */ + { "ahst", tZONE, HOUR(10) }, /* Alaska-Hawaii Standard */ + { "nt", tZONE, HOUR(11) }, /* Nome */ + { "idlw", tZONE, HOUR(12) }, /* International Date Line West */ + { "cet", tZONE, -HOUR( 1) }, /* Central European */ + { "met", tZONE, -HOUR( 1) }, /* Middle European */ + { "mewt", tZONE, -HOUR( 1) }, /* Middle European Winter */ + { "mest", tDAYZONE, -HOUR( 1) }, /* Middle European Summer */ + { "swt", tZONE, -HOUR( 1) }, /* Swedish Winter */ + { "sst", tDAYZONE, -HOUR( 1) }, /* Swedish Summer */ + { "fwt", tZONE, -HOUR( 1) }, /* French Winter */ + { "fst", tDAYZONE, -HOUR( 1) }, /* French Summer */ + { "eet", tZONE, -HOUR( 2) }, /* Eastern Europe, USSR Zone 1 */ + { "bt", tZONE, -HOUR( 3) }, /* Baghdad, USSR Zone 2 */ + { "it", tZONE, -HOUR( 7/2) }, /* Iran */ + { "zp4", tZONE, -HOUR( 4) }, /* USSR Zone 3 */ + { "zp5", tZONE, -HOUR( 5) }, /* USSR Zone 4 */ + { "ist", tZONE, -HOUR(11/2) }, /* Indian Standard */ + { "zp6", tZONE, -HOUR( 6) }, /* USSR Zone 5 */ +#if 0 + /* For completeness. NST is also Newfoundland Stanard, nad SST is + * also Swedish Summer. */ + { "nst", tZONE, -HOUR(13/2) }, /* North Sumatra */ + { "sst", tZONE, -HOUR( 7) }, /* South Sumatra, USSR Zone 6 */ +#endif /* 0 */ + { "wast", tZONE, -HOUR( 7) }, /* West Australian Standard */ + { "wadt", tDAYZONE, -HOUR( 7) }, /* West Australian Daylight */ + { "jt", tZONE, -HOUR(15/2) }, /* Java (3pm in Cronusland!) */ + { "cct", tZONE, -HOUR( 8) }, /* China Coast, USSR Zone 7 */ + { "jst", tZONE, -HOUR( 9) }, /* Japan Standard, USSR Zone 8 */ + { "cast", tZONE, -HOUR(19/2) }, /* Central Australian Standard */ + { "cadt", tDAYZONE, -HOUR(19/2) }, /* Central Australian Daylight */ + { "east", tZONE, -HOUR(10) }, /* Eastern Australian Standard */ + { "eadt", tDAYZONE, -HOUR(10) }, /* Eastern Australian Daylight */ + { "gst", tZONE, -HOUR(10) }, /* Guam Standard, USSR Zone 9 */ + { "nzt", tZONE, -HOUR(12) }, /* New Zealand */ + { "nzst", tZONE, -HOUR(12) }, /* New Zealand Standard */ + { "nzdt", tDAYZONE, -HOUR(12) }, /* New Zealand Daylight */ + { "idle", tZONE, -HOUR(12) }, /* International Date Line East */ + /* ADDED BY Marco Nijdam */ + { "dst", tDST, HOUR( 0) }, /* DST on (hour is ignored) */ + /* End ADDED */ + { NULL } +}; + +/* + * Military timezone table. + */ +static TABLE MilitaryTable[] = { + { "a", tZONE, HOUR( 1) }, + { "b", tZONE, HOUR( 2) }, + { "c", tZONE, HOUR( 3) }, + { "d", tZONE, HOUR( 4) }, + { "e", tZONE, HOUR( 5) }, + { "f", tZONE, HOUR( 6) }, + { "g", tZONE, HOUR( 7) }, + { "h", tZONE, HOUR( 8) }, + { "i", tZONE, HOUR( 9) }, + { "k", tZONE, HOUR( 10) }, + { "l", tZONE, HOUR( 11) }, + { "m", tZONE, HOUR( 12) }, + { "n", tZONE, HOUR(- 1) }, + { "o", tZONE, HOUR(- 2) }, + { "p", tZONE, HOUR(- 3) }, + { "q", tZONE, HOUR(- 4) }, + { "r", tZONE, HOUR(- 5) }, + { "s", tZONE, HOUR(- 6) }, + { "t", tZONE, HOUR(- 7) }, + { "u", tZONE, HOUR(- 8) }, + { "v", tZONE, HOUR(- 9) }, + { "w", tZONE, HOUR(-10) }, + { "x", tZONE, HOUR(-11) }, + { "y", tZONE, HOUR(-12) }, + { "z", tZONE, HOUR( 0) }, + { NULL } +}; + + +/* + * Dump error messages in the bit bucket. + */ +static void +yyerror(s) + char *s; +{ +} + + +static time_t +ToSeconds(Hours, Minutes, Seconds, Meridian) + time_t Hours; + time_t Minutes; + time_t Seconds; + MERIDIAN Meridian; +{ + if (Minutes < 0 || Minutes > 59 || Seconds < 0 || Seconds > 59) + return -1; + switch (Meridian) { + case MER24: + if (Hours < 0 || Hours > 23) + return -1; + return (Hours * 60L + Minutes) * 60L + Seconds; + case MERam: + if (Hours < 1 || Hours > 12) + return -1; + return ((Hours % 12) * 60L + Minutes) * 60L + Seconds; + case MERpm: + if (Hours < 1 || Hours > 12) + return -1; + return (((Hours % 12) + 12) * 60L + Minutes) * 60L + Seconds; + } + return -1; /* Should never be reached */ +} + + +static int +Convert(Month, Day, Year, Hours, Minutes, Seconds, Meridian, DSTmode, TimePtr) + time_t Month; + time_t Day; + time_t Year; + time_t Hours; + time_t Minutes; + time_t Seconds; + MERIDIAN Meridian; + DSTMODE DSTmode; + time_t *TimePtr; +{ + static int DaysInMonth[12] = { + 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 + }; + time_t tod; + time_t Julian; + int i; + + DaysInMonth[1] = Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) + ? 29 : 28; + if (Month < 1 || Month > 12 + || Year < START_OF_TIME || Year > END_OF_TIME + || Day < 1 || Day > DaysInMonth[(int)--Month]) + return -1; + + for (Julian = Day - 1, i = 0; i < Month; i++) + Julian += DaysInMonth[i]; + if (Year >= EPOCH) { + for (i = EPOCH; i < Year; i++) + Julian += 365 + (i % 4 == 0); + } else { + for (i = Year; i < EPOCH; i++) + Julian -= 365 + (i % 4 == 0); + } + Julian *= SECSPERDAY; + Julian += yyTimezone * 60L; + if ((tod = ToSeconds(Hours, Minutes, Seconds, Meridian)) < 0) + return -1; + Julian += tod; + if (DSTmode == DSTon + || (DSTmode == DSTmaybe && TclpGetDate(&Julian, 0)->tm_isdst)) + Julian -= 60 * 60; + *TimePtr = Julian; + return 0; +} + + +static time_t +DSTcorrect(Start, Future) + time_t Start; + time_t Future; +{ + time_t StartDay; + time_t FutureDay; + + StartDay = (TclpGetDate(&Start, 0)->tm_hour + 1) % 24; + FutureDay = (TclpGetDate(&Future, 0)->tm_hour + 1) % 24; + return (Future - Start) + (StartDay - FutureDay) * 60L * 60L; +} + + +static time_t +RelativeDate(Start, DayOrdinal, DayNumber) + time_t Start; + time_t DayOrdinal; + time_t DayNumber; +{ + struct tm *tm; + time_t now; + + now = Start; + tm = TclpGetDate(&now, 0); + now += SECSPERDAY * ((DayNumber - tm->tm_wday + 7) % 7); + now += 7 * SECSPERDAY * (DayOrdinal <= 0 ? DayOrdinal : DayOrdinal - 1); + return DSTcorrect(Start, now); +} + + +static int +RelativeMonth(Start, RelMonth, TimePtr) + time_t Start; + time_t RelMonth; + time_t *TimePtr; +{ + struct tm *tm; + time_t Month; + time_t Year; + time_t Julian; + int result; + + if (RelMonth == 0) { + *TimePtr = 0; + return 0; + } + tm = TclpGetDate(&Start, 0); + Month = 12 * (tm->tm_year + TM_YEAR_BASE) + tm->tm_mon + RelMonth; + Year = Month / 12; + Month = Month % 12 + 1; + result = Convert(Month, (time_t) tm->tm_mday, Year, + (time_t) tm->tm_hour, (time_t) tm->tm_min, (time_t) tm->tm_sec, + MER24, DSTmaybe, &Julian); + /* + * The following iteration takes into account the case were we jump + * into a "short month". Far example, "one month from Jan 31" will + * fail because there is no Feb 31. The code below will reduce the + * day and try converting the date until we succed or the date equals + * 28 (which always works unless the date is bad in another way). + */ + + while ((result != 0) && (tm->tm_mday > 28)) { + tm->tm_mday--; + result = Convert(Month, (time_t) tm->tm_mday, Year, + (time_t) tm->tm_hour, (time_t) tm->tm_min, (time_t) tm->tm_sec, + MER24, DSTmaybe, &Julian); + } + if (result != 0) { + return -1; + } + *TimePtr = DSTcorrect(Start, Julian); + return 0; +} + + +static int +LookupWord(buff) + char *buff; +{ + register char *p; + register char *q; + register TABLE *tp; + int i; + int abbrev; + + /* + * Make it lowercase. + */ + for (p = buff; *p; p++) { + if (isupper(UCHAR(*p))) { + *p = (char) tolower(UCHAR(*p)); + } + } + + if (strcmp(buff, "am") == 0 || strcmp(buff, "a.m.") == 0) { + yylval.Meridian = MERam; + return tMERIDIAN; + } + if (strcmp(buff, "pm") == 0 || strcmp(buff, "p.m.") == 0) { + yylval.Meridian = MERpm; + return tMERIDIAN; + } + + /* + * See if we have an abbreviation for a month. + */ + if (strlen(buff) == 3) { + abbrev = 1; + } else if (strlen(buff) == 4 && buff[3] == '.') { + abbrev = 1; + buff[3] = '\0'; + } else { + abbrev = 0; + } + + for (tp = MonthDayTable; tp->name; tp++) { + if (abbrev) { + if (strncmp(buff, tp->name, 3) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } else if (strcmp(buff, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + + for (tp = TimezoneTable; tp->name; tp++) { + if (strcmp(buff, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + + for (tp = UnitsTable; tp->name; tp++) { + if (strcmp(buff, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + + /* + * Strip off any plural and try the units table again. + */ + i = strlen(buff) - 1; + if (buff[i] == 's') { + buff[i] = '\0'; + for (tp = UnitsTable; tp->name; tp++) { + if (strcmp(buff, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + } + + for (tp = OtherTable; tp->name; tp++) { + if (strcmp(buff, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + + /* + * Military timezones. + */ + if (buff[1] == '\0' && isalpha(UCHAR(*buff))) { + for (tp = MilitaryTable; tp->name; tp++) { + if (strcmp(buff, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + } + + /* + * Drop out any periods and try the timezone table again. + */ + for (i = 0, p = q = buff; *q; q++) + if (*q != '.') { + *p++ = *q; + } else { + i++; + } + *p = '\0'; + if (i) { + for (tp = TimezoneTable; tp->name; tp++) { + if (strcmp(buff, tp->name) == 0) { + yylval.Number = tp->value; + return tp->type; + } + } + } + + return tID; +} + + +static int +yylex() +{ + register char c; + register char *p; + char buff[20]; + int Count; + int sign; + + for ( ; ; ) { + while (isspace((unsigned char) (*yyInput))) { + yyInput++; + } + + if (isdigit(c = *yyInput) || c == '-' || c == '+') { + if (c == '-' || c == '+') { + sign = c == '-' ? -1 : 1; + if (!isdigit(*++yyInput)) { + /* + * skip the '-' sign + */ + continue; + } + } else { + sign = 0; + } + for (yylval.Number = 0; isdigit(c = *yyInput++); ) { + yylval.Number = 10 * yylval.Number + c - '0'; + } + yyInput--; + if (sign < 0) { + yylval.Number = -yylval.Number; + } + return sign ? tSNUMBER : tUNUMBER; + } + if (isalpha(UCHAR(c))) { + for (p = buff; isalpha(c = *yyInput++) || c == '.'; ) { + if (p < &buff[sizeof buff - 1]) { + *p++ = c; + } + } + *p = '\0'; + yyInput--; + return LookupWord(buff); + } + if (c != '(') { + return *yyInput++; + } + Count = 0; + do { + c = *yyInput++; + if (c == '\0') { + return c; + } else if (c == '(') { + Count++; + } else if (c == ')') { + Count--; + } + } while (Count > 0); + } +} + +/* + * Specify zone is of -50000 to force GMT. (This allows BST to work). + */ + +int +TclGetDate(p, now, zone, timePtr) + char *p; + unsigned long now; + long zone; + unsigned long *timePtr; +{ + struct tm *tm; + time_t Start; + time_t Time; + time_t tod; + int thisyear; + + yyInput = p; + tm = TclpGetDate((time_t *) &now, 0); + thisyear = tm->tm_year + TM_YEAR_BASE; + yyYear = thisyear; + yyMonth = tm->tm_mon + 1; + yyDay = tm->tm_mday; + yyTimezone = zone; + if (zone == -50000) { + yyDSTmode = DSToff; /* assume GMT */ + yyTimezone = 0; + } else { + yyDSTmode = DSTmaybe; + } + yyHour = 0; + yyMinutes = 0; + yySeconds = 0; + yyMeridian = MER24; + yyRelSeconds = 0; + yyRelMonth = 0; + yyHaveDate = 0; + yyHaveDay = 0; + yyHaveRel = 0; + yyHaveTime = 0; + yyHaveZone = 0; + + if (yyparse() || yyHaveTime > 1 || yyHaveZone > 1 || yyHaveDate > 1 || + yyHaveDay > 1) { + return -1; + } + + if (yyHaveDate || yyHaveTime || yyHaveDay) { + if (TclDateYear < 0) { + TclDateYear = -TclDateYear; + } + /* + * The following line handles years that are specified using + * only two digits. The line of code below implements a policy + * defined by the X/Open workgroup on the millinium rollover. + * Note: some of those dates may not actually be valid on some + * platforms. The POSIX standard startes that the dates 70-99 + * shall refer to 1970-1999 and 00-38 shall refer to 2000-2038. + * This later definition should work on all platforms. + */ + + if (TclDateYear < 100) { + if (TclDateYear >= 69) { + TclDateYear += 1900; + } else { + TclDateYear += 2000; + } + } + if (Convert(yyMonth, yyDay, yyYear, yyHour, yyMinutes, yySeconds, + yyMeridian, yyDSTmode, &Start) < 0) { + return -1; + } + } else { + Start = now; + if (!yyHaveRel) { + Start -= ((tm->tm_hour * 60L) + tm->tm_min * 60L) + tm->tm_sec; + } + } + + Start += yyRelSeconds; + if (RelativeMonth(Start, yyRelMonth, &Time) < 0) { + return -1; + } + Start += Time; + + if (yyHaveDay && !yyHaveDate) { + tod = RelativeDate(Start, yyDayOrdinal, yyDayNumber); + Start += tod; + } + + *timePtr = Start; + return 0; +} |