Chris Hofstaedtler
746 lines
15 KiB
Plaintext
746 lines
15 KiB
Plaintext
%{
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/*
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** Originally written by Steven M. Bellovin <smb@research.att.com> while
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** at the University of North Carolina at Chapel Hill. Later tweaked by
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** a couple of people on Usenet. Completely overhauled by Rich $alz
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** <rsalz@bbn.com> and Jim Berets <jberets@bbn.com> in August, 1990;
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**
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** This grammar has 13 shift/reduce conflicts.
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**
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** This code is in the public domain and has no copyright.
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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/* Since the code of getdate.y is not included in the Emacs executable
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itself, there is no need to #define static in this file. Even if
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the code were included in the Emacs executable, it probably
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wouldn't do any harm to #undef it here; this will only cause
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problems if we try to write to a static variable, which I don't
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think this code needs to do. */
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#ifdef emacs
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# undef static
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#endif
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include "attr.h"
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#include "getdate.h"
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#include "string/strcmp/streq.h"
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#include "string/strspn/stpspn.h"
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/* Some old versions of bison generate parsers that use bcopy.
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That loses on systems that don't provide the function, so we have
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to redefine it here. */
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#if !defined (HAVE_BCOPY) && !defined (bcopy)
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# define bcopy(from, to, len) memcpy ((to), (from), (len))
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#endif
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/* Remap normal yacc parser interface names (yyparse, yylex, yyerror, etc),
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as well as gratuitously global symbol names, so we can have multiple
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yacc generated parsers in the same program. Note that these are only
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the variables produced by yacc. If other parser generators (bison,
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byacc, etc) produce additional global names that conflict at link time,
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then those parser generators need to be fixed instead of adding those
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names to this list. */
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#define yymaxdepth gd_maxdepth
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#define yyparse gd_parse
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#define yylex gd_lex
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#define yyerror gd_error
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#define yylval gd_lval
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#define yychar gd_char
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#define yydebug gd_debug
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#define yypact gd_pact
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#define yyr1 gd_r1
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#define yyr2 gd_r2
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#define yydef gd_def
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#define yychk gd_chk
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#define yypgo gd_pgo
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#define yyact gd_act
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#define yyexca gd_exca
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#define yyerrflag gd_errflag
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#define yynerrs gd_nerrs
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#define yyps gd_ps
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#define yypv gd_pv
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#define yys gd_s
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#define yy_yys gd_yys
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#define yystate gd_state
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#define yytmp gd_tmp
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#define yyv gd_v
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#define yy_yyv gd_yyv
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#define yyval gd_val
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#define yylloc gd_lloc
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#define yyreds gd_reds /* With YYDEBUG defined */
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#define yytoks gd_toks /* With YYDEBUG defined */
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#define yylhs gd_yylhs
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#define yylen gd_yylen
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#define yydefred gd_yydefred
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#define yydgoto gd_yydgoto
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#define yysindex gd_yysindex
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#define yyrindex gd_yyrindex
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#define yygindex gd_yygindex
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#define yytable gd_yytable
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#define yycheck gd_yycheck
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static int yylex (void);
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static int yyerror (const char *s);
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#define MAX_BUFF_LEN 128 /* size of buffer to read the date into */
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/*
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** An entry in the lexical lookup table.
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*/
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typedef struct _TABLE {
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const char *name;
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int type;
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int value;
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} TABLE;
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/*
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** Meridian: am, pm, or 24-hour style.
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*/
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typedef enum _MERIDIAN {
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MERam, MERpm, MER24
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} MERIDIAN;
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/*
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** Global variables. We could get rid of most of these by using a good
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** union as the yacc stack. (This routine was originally written before
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** yacc had the %union construct.) Maybe someday; right now we only use
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** the %union very rarely.
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*/
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static const char *yyInput;
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static int yyDayOrdinal;
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static int yyDayNumber;
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static int yyHaveDate;
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static int yyHaveDay;
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static int yyHaveRel;
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static int yyHaveTime;
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static int yyDay;
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static int yyHour;
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static int yyMinutes;
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static int yyMonth;
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static int yySeconds;
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static int yyYear;
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static MERIDIAN yyMeridian;
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static int yyRelDay;
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static int yyRelHour;
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static int yyRelMinutes;
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static int yyRelMonth;
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static int yyRelSeconds;
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static int yyRelYear;
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%}
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%union {
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int Number;
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enum _MERIDIAN Meridian;
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}
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%token tAGO tDAY tDAY_UNIT tHOUR_UNIT tID
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%token tMERIDIAN tMINUTE_UNIT tMONTH tMONTH_UNIT
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%token tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT
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%type <Number> tDAY tDAY_UNIT tHOUR_UNIT tMINUTE_UNIT
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%type <Number> tMONTH tMONTH_UNIT
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%type <Number> tSEC_UNIT tSNUMBER tUNUMBER tYEAR_UNIT
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%type <Meridian> tMERIDIAN o_merid
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%%
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spec : /* NULL */
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| spec item
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;
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item : time {
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yyHaveTime++;
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}
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| date {
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yyHaveDate++;
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}
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| day {
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yyHaveDay++;
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}
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| rel {
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yyHaveRel++;
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}
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| number
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;
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time : tUNUMBER tMERIDIAN {
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yyHour = $1;
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yyMinutes = 0;
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yySeconds = 0;
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yyMeridian = $2;
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}
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| tUNUMBER ':' tUNUMBER o_merid {
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yyHour = $1;
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yyMinutes = $3;
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yySeconds = 0;
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yyMeridian = $4;
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}
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| tUNUMBER ':' tUNUMBER {
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yyHour = $1;
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yyMinutes = $3;
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yyMeridian = MER24;
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER o_merid {
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yyHour = $1;
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yyMinutes = $3;
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yySeconds = $5;
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yyMeridian = $6;
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}
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| tUNUMBER ':' tUNUMBER ':' tUNUMBER {
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yyHour = $1;
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yyMinutes = $3;
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yySeconds = $5;
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yyMeridian = MER24;
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}
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;
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day : tDAY {
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yyDayOrdinal = 1;
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yyDayNumber = $1;
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}
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| tDAY ',' {
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yyDayOrdinal = 1;
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yyDayNumber = $1;
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}
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| tUNUMBER tDAY {
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yyDayOrdinal = $1;
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yyDayNumber = $2;
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}
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;
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date : tUNUMBER '/' tUNUMBER {
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yyMonth = $1;
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yyDay = $3;
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}
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| tUNUMBER '/' tUNUMBER '/' tUNUMBER {
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/* Interpret as YYYY/MM/DD if $1 >= 1000, otherwise as MM/DD/YY.
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The goal in recognizing YYYY/MM/DD is solely to support legacy
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machine-generated dates like those in an RCS log listing. If
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you want portability, use the ISO 8601 format. */
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if ($1 >= 1000)
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{
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yyYear = $1;
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yyMonth = $3;
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yyDay = $5;
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}
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else
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{
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yyMonth = $1;
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yyDay = $3;
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yyYear = $5;
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}
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}
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| tUNUMBER tSNUMBER tSNUMBER {
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/* ISO 8601 format. yyyy-mm-dd. */
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yyYear = $1;
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yyMonth = -$2;
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yyDay = -$3;
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}
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| tUNUMBER tMONTH tSNUMBER {
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/* e.g. 17-JUN-1992. */
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yyDay = $1;
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yyMonth = $2;
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yyYear = -$3;
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}
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| tMONTH tUNUMBER {
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yyMonth = $1;
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yyDay = $2;
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}
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| tMONTH tUNUMBER ',' tUNUMBER {
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yyMonth = $1;
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yyDay = $2;
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yyYear = $4;
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}
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| tUNUMBER tMONTH {
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yyMonth = $2;
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yyDay = $1;
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}
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| tUNUMBER tMONTH tUNUMBER {
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yyMonth = $2;
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yyDay = $1;
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yyYear = $3;
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}
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;
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rel : relunit tAGO {
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yyRelSeconds = -yyRelSeconds;
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yyRelMinutes = -yyRelMinutes;
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yyRelHour = -yyRelHour;
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yyRelDay = -yyRelDay;
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yyRelMonth = -yyRelMonth;
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yyRelYear = -yyRelYear;
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}
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| relunit
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;
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relunit : tUNUMBER tYEAR_UNIT {
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yyRelYear += $1 * $2;
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}
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| tSNUMBER tYEAR_UNIT {
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yyRelYear += $1 * $2;
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}
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| tYEAR_UNIT {
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yyRelYear += $1;
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}
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| tUNUMBER tMONTH_UNIT {
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yyRelMonth += $1 * $2;
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}
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| tSNUMBER tMONTH_UNIT {
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yyRelMonth += $1 * $2;
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}
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| tMONTH_UNIT {
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yyRelMonth += $1;
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}
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| tUNUMBER tDAY_UNIT {
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yyRelDay += $1 * $2;
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}
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| tSNUMBER tDAY_UNIT {
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yyRelDay += $1 * $2;
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}
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| tDAY_UNIT {
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yyRelDay += $1;
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}
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| tUNUMBER tHOUR_UNIT {
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yyRelHour += $1 * $2;
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}
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| tSNUMBER tHOUR_UNIT {
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yyRelHour += $1 * $2;
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}
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| tHOUR_UNIT {
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yyRelHour += $1;
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}
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| tUNUMBER tMINUTE_UNIT {
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yyRelMinutes += $1 * $2;
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}
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| tSNUMBER tMINUTE_UNIT {
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yyRelMinutes += $1 * $2;
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}
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| tMINUTE_UNIT {
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yyRelMinutes += $1;
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}
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| tUNUMBER tSEC_UNIT {
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yyRelSeconds += $1 * $2;
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}
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| tSNUMBER tSEC_UNIT {
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yyRelSeconds += $1 * $2;
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}
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| tSEC_UNIT {
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yyRelSeconds += $1;
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}
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;
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number : tUNUMBER
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{
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if ((yyHaveTime != 0) && (yyHaveDate != 0) && (yyHaveRel == 0))
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yyYear = $1;
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else
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{
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if ($1>10000)
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{
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yyHaveDate++;
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yyDay= ($1)%100;
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yyMonth= ($1/100)%100;
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yyYear = $1/10000;
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}
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else
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{
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yyHaveTime++;
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if ($1 < 100)
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{
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yyHour = $1;
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yyMinutes = 0;
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}
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else
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{
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yyHour = $1 / 100;
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yyMinutes = $1 % 100;
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}
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yySeconds = 0;
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yyMeridian = MER24;
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}
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}
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}
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;
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o_merid : /* NULL */
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{
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$$ = MER24;
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}
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| tMERIDIAN
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{
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$$ = $1;
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}
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;
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%%
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/* Month and day table. */
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static TABLE const MonthDayTable[] = {
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{ "january", tMONTH, 1 },
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{ "february", tMONTH, 2 },
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{ "march", tMONTH, 3 },
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{ "april", tMONTH, 4 },
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{ "may", tMONTH, 5 },
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{ "june", tMONTH, 6 },
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{ "july", tMONTH, 7 },
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{ "august", tMONTH, 8 },
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{ "september", tMONTH, 9 },
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{ "sept", tMONTH, 9 },
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{ "october", tMONTH, 10 },
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{ "november", tMONTH, 11 },
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{ "december", tMONTH, 12 },
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{ "sunday", tDAY, 0 },
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{ "monday", tDAY, 1 },
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{ "tuesday", tDAY, 2 },
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{ "tues", tDAY, 2 },
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{ "wednesday", tDAY, 3 },
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{ "wednes", tDAY, 3 },
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{ "thursday", tDAY, 4 },
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{ "thur", tDAY, 4 },
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{ "thurs", tDAY, 4 },
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{ "friday", tDAY, 5 },
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{ "saturday", tDAY, 6 },
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{ NULL, 0, 0 }
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};
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/* Time units table. */
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static TABLE const UnitsTable[] = {
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{ "year", tYEAR_UNIT, 1 },
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{ "month", tMONTH_UNIT, 1 },
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{ "fortnight", tDAY_UNIT, 14 },
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{ "week", tDAY_UNIT, 7 },
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{ "day", tDAY_UNIT, 1 },
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{ "hour", tHOUR_UNIT, 1 },
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{ "minute", tMINUTE_UNIT, 1 },
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{ "min", tMINUTE_UNIT, 1 },
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{ "second", tSEC_UNIT, 1 },
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{ "sec", tSEC_UNIT, 1 },
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{ NULL, 0, 0 }
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};
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/* Assorted relative-time words. */
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static TABLE const OtherTable[] = {
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{ "tomorrow", tMINUTE_UNIT, 1 * 24 * 60 },
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{ "yesterday", tMINUTE_UNIT, -1 * 24 * 60 },
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{ "today", tMINUTE_UNIT, 0 },
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{ "now", tMINUTE_UNIT, 0 },
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{ "last", tUNUMBER, -1 },
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{ "this", tMINUTE_UNIT, 0 },
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{ "next", tUNUMBER, 2 },
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{ "first", tUNUMBER, 1 },
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/* { "second", tUNUMBER, 2 }, */
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{ "third", tUNUMBER, 3 },
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{ "fourth", tUNUMBER, 4 },
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{ "fifth", tUNUMBER, 5 },
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{ "sixth", tUNUMBER, 6 },
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{ "seventh", tUNUMBER, 7 },
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{ "eighth", tUNUMBER, 8 },
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{ "ninth", tUNUMBER, 9 },
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{ "tenth", tUNUMBER, 10 },
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{ "eleventh", tUNUMBER, 11 },
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{ "twelfth", tUNUMBER, 12 },
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{ "ago", tAGO, 1 },
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{ NULL, 0, 0 }
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};
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static int yyerror (MAYBE_UNUSED const char *s)
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{
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return 0;
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}
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static int ToHour (int Hours, MERIDIAN Meridian)
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{
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switch (Meridian)
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{
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case MER24:
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if (Hours < 0 || Hours > 23)
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return -1;
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return Hours;
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case MERam:
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if (Hours < 1 || Hours > 12)
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return -1;
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if (Hours == 12)
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Hours = 0;
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return Hours;
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case MERpm:
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if (Hours < 1 || Hours > 12)
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return -1;
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if (Hours == 12)
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Hours = 0;
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return Hours + 12;
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default:
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abort ();
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}
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/* NOTREACHED */
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}
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static int ToYear (int Year)
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{
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if (Year < 0)
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Year = -Year;
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/* XPG4 suggests that years 00-68 map to 2000-2068, and
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years 69-99 map to 1969-1999. */
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if (Year < 69)
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Year += 2000;
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else if (Year < 100)
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Year += 1900;
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return Year;
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}
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static int LookupWord (char *buff)
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{
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register char *p;
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register const TABLE *tp;
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int i;
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bool abbrev;
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/* Make it lowercase. */
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for (p = buff; !streq(p, ""); p++)
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if (isupper (*p))
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*p = tolower (*p);
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if (streq(buff, "am") || streq(buff, "a.m."))
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{
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yylval.Meridian = MERam;
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return tMERIDIAN;
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}
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if (streq(buff, "pm") || streq(buff, "p.m."))
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{
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yylval.Meridian = MERpm;
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return tMERIDIAN;
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}
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/* See if we have an abbreviation for a month. */
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if (strlen (buff) == 3)
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abbrev = true;
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else if (strlen (buff) == 4 && buff[3] == '.')
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{
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abbrev = true;
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stpcpy(&buff[3], "");
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}
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else
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abbrev = false;
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for (tp = MonthDayTable; tp->name; tp++)
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{
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if (abbrev)
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{
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if (strncmp (buff, tp->name, 3) == 0)
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{
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yylval.Number = tp->value;
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return tp->type;
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}
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}
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else if (streq(buff, tp->name))
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{
|
|
yylval.Number = tp->value;
|
|
return tp->type;
|
|
}
|
|
}
|
|
|
|
for (tp = UnitsTable; tp->name; tp++)
|
|
if (streq(buff, tp->name))
|
|
{
|
|
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')
|
|
{
|
|
stpcpy(&buff[i], "");
|
|
for (tp = UnitsTable; tp->name; tp++)
|
|
if (streq(buff, tp->name))
|
|
{
|
|
yylval.Number = tp->value;
|
|
return tp->type;
|
|
}
|
|
buff[i] = 's'; /* Put back for "this" in OtherTable. */
|
|
}
|
|
|
|
for (tp = OtherTable; tp->name; tp++)
|
|
if (streq(buff, tp->name))
|
|
{
|
|
yylval.Number = tp->value;
|
|
return tp->type;
|
|
}
|
|
|
|
return tID;
|
|
}
|
|
|
|
static int
|
|
yylex (void)
|
|
{
|
|
register char c;
|
|
register char *p;
|
|
char buff[20];
|
|
int Count;
|
|
int sign;
|
|
|
|
for (;;)
|
|
{
|
|
yyInput = stpspn(yyInput, " \t");
|
|
|
|
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 (0 != sign) ? tSNUMBER : tUNUMBER;
|
|
}
|
|
if (isalpha (c))
|
|
{
|
|
for (p = buff; (c = *yyInput++, isalpha (c)) || c == '.';)
|
|
if (p < &buff[sizeof buff - 1])
|
|
*p++ = c;
|
|
stpcpy(p, "");
|
|
yyInput--;
|
|
return LookupWord (buff);
|
|
}
|
|
if (c != '(')
|
|
return *yyInput++;
|
|
Count = 0;
|
|
do
|
|
{
|
|
c = *yyInput++;
|
|
if (c == '\0')
|
|
return c;
|
|
if (c == '(')
|
|
Count++;
|
|
else if (c == ')')
|
|
Count--;
|
|
}
|
|
while (Count > 0);
|
|
}
|
|
}
|
|
|
|
#define TM_YEAR_ORIGIN 1900
|
|
|
|
time_t get_date (const char *p, const time_t *now)
|
|
{
|
|
struct tm tm, *tmp;
|
|
time_t Start;
|
|
|
|
yyInput = p;
|
|
Start = now ? *now : time(NULL);
|
|
tmp = gmtime(&Start);
|
|
yyYear = tmp->tm_year + TM_YEAR_ORIGIN;
|
|
yyMonth = tmp->tm_mon + 1;
|
|
yyDay = tmp->tm_mday;
|
|
yyHour = tmp->tm_hour;
|
|
yyMinutes = tmp->tm_min;
|
|
yySeconds = tmp->tm_sec;
|
|
yyMeridian = MER24;
|
|
yyRelSeconds = 0;
|
|
yyRelMinutes = 0;
|
|
yyRelHour = 0;
|
|
yyRelDay = 0;
|
|
yyRelMonth = 0;
|
|
yyRelYear = 0;
|
|
yyHaveDate = 0;
|
|
yyHaveDay = 0;
|
|
yyHaveRel = 0;
|
|
yyHaveTime = 0;
|
|
|
|
if (yyparse ()
|
|
|| yyHaveTime > 1 || yyHaveDate > 1 || yyHaveDay > 1)
|
|
return -1;
|
|
|
|
tm.tm_year = ToYear (yyYear) - TM_YEAR_ORIGIN + yyRelYear;
|
|
tm.tm_mon = yyMonth - 1 + yyRelMonth;
|
|
tm.tm_mday = yyDay + yyRelDay;
|
|
if ((yyHaveTime != 0) ||
|
|
( (yyHaveRel != 0) && (yyHaveDate == 0) && (yyHaveDay == 0) ))
|
|
{
|
|
tm.tm_hour = ToHour (yyHour, yyMeridian);
|
|
if (tm.tm_hour < 0)
|
|
return -1;
|
|
tm.tm_min = yyMinutes;
|
|
tm.tm_sec = yySeconds;
|
|
}
|
|
else
|
|
{
|
|
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
|
|
}
|
|
tm.tm_hour += yyRelHour;
|
|
tm.tm_min += yyRelMinutes;
|
|
tm.tm_sec += yyRelSeconds;
|
|
tm.tm_isdst = 0;
|
|
|
|
Start = timegm(&tm);
|
|
|
|
if (Start == (time_t) -1)
|
|
{
|
|
return Start;
|
|
}
|
|
|
|
if (yyHaveDay && !yyHaveDate)
|
|
{
|
|
tm.tm_mday += ((yyDayNumber - tm.tm_wday + 7) % 7
|
|
+ 7 * (yyDayOrdinal - (0 < yyDayOrdinal)));
|
|
Start = timegm(&tm);
|
|
if (Start == (time_t) -1)
|
|
return Start;
|
|
}
|
|
|
|
return Start;
|
|
}
|
|
|
|
#if defined (TEST)
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
char buff[MAX_BUFF_LEN + 1];
|
|
time_t d;
|
|
|
|
(void) printf ("Enter date, or blank line to exit.\n\t> ");
|
|
(void) fflush (stdout);
|
|
|
|
buff[MAX_BUFF_LEN] = 0;
|
|
while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0])
|
|
{
|
|
d = get_date(buff, NULL);
|
|
if (d == -1)
|
|
(void) printf ("Bad format - couldn't convert.\n");
|
|
else
|
|
(void) printf ("%s", ctime (&d));
|
|
(void) printf ("\t> ");
|
|
(void) fflush (stdout);
|
|
}
|
|
exit (0);
|
|
/* NOTREACHED */
|
|
}
|
|
#endif /* defined (TEST) */
|