date_strptime.c
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/*
date_strptime.c: Coded by Tadayoshi Funaba 2011,2012
*/
#include "ruby.h"
#include "ruby/encoding.h"
#include "ruby/re.h"
#include <ctype.h>
static const char *day_names[] = {
"Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday",
"Sun", "Mon", "Tue", "Wed",
"Thu", "Fri", "Sat"
};
static const char *month_names[] = {
"January", "February", "March", "April",
"May", "June", "July", "August", "September",
"October", "November", "December",
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static const char *merid_names[] = {
"am", "pm",
"a.m.", "p.m."
};
static const char *extz_pats[] = {
":z",
"::z",
":::z"
};
#define sizeof_array(o) (sizeof o / sizeof o[0])
#define f_negate(x) rb_funcall(x, rb_intern("-@"), 0)
#define f_add(x,y) rb_funcall(x, '+', 1, y)
#define f_sub(x,y) rb_funcall(x, '-', 1, y)
#define f_mul(x,y) rb_funcall(x, '*', 1, y)
#define f_div(x,y) rb_funcall(x, '/', 1, y)
#define f_idiv(x,y) rb_funcall(x, rb_intern("div"), 1, y)
#define f_mod(x,y) rb_funcall(x, '%', 1, y)
#define f_expt(x,y) rb_funcall(x, rb_intern("**"), 1, y)
#define f_lt_p(x,y) rb_funcall(x, '<', 1, y)
#define f_gt_p(x,y) rb_funcall(x, '>', 1, y)
#define f_le_p(x,y) rb_funcall(x, rb_intern("<="), 1, y)
#define f_ge_p(x,y) rb_funcall(x, rb_intern(">="), 1, y)
#define f_match(r,s) rb_funcall(r, rb_intern("match"), 1, s)
#define f_aref(o,i) rb_funcall(o, rb_intern("[]"), 1, i)
#define f_end(o,i) rb_funcall(o, rb_intern("end"), 1, i)
#define issign(c) ((c) == '-' || (c) == '+')
static int
num_pattern_p(const char *s)
{
if (isdigit(*s))
return 1;
if (*s == '%') {
s++;
if (*s == 'E' || *s == 'O')
s++;
if (*s &&
(strchr("CDdeFGgHIjkLlMmNQRrSsTUuVvWwXxYy", *s) || isdigit(*s)))
return 1;
}
return 0;
}
#define NUM_PATTERN_P() num_pattern_p(&fmt[fi + 1])
static long
read_digits(const char *s, VALUE *n, size_t width)
{
size_t l;
l = strspn(s, "0123456789");
if (l == 0)
return 0;
if (width < l)
l = width;
if ((4 * l * sizeof(char)) <= (sizeof(long)*CHAR_BIT)) {
const char *os = s;
long v;
v = 0;
while ((size_t)(s - os) < l) {
v *= 10;
v += *s - '0';
s++;
}
if (os == s)
return 0;
*n = LONG2NUM(v);
return l;
}
else {
char *s2 = ALLOCA_N(char, l + 1);
memcpy(s2, s, l);
s2[l] = '\0';
*n = rb_cstr_to_inum(s2, 10, 0);
return l;
}
}
#define set_hash(k,v) rb_hash_aset(hash, ID2SYM(rb_intern(k)), v)
#define ref_hash(k) rb_hash_aref(hash, ID2SYM(rb_intern(k)))
#define del_hash(k) rb_hash_delete(hash, ID2SYM(rb_intern(k)))
#define fail() \
{ \
set_hash("_fail", Qtrue); \
return 0; \
}
#define fail_p() (!NIL_P(ref_hash("_fail")))
#define READ_DIGITS(n,w) \
{ \
size_t l; \
l = read_digits(&str[si], &n, w); \
if (l == 0) \
fail(); \
si += l; \
}
#define READ_DIGITS_MAX(n) READ_DIGITS(n, LONG_MAX)
static int
valid_range_p(VALUE v, int a, int b)
{
if (FIXNUM_P(v)) {
int vi = FIX2INT(v);
return !(vi < a || vi > b);
}
return !(f_lt_p(v, INT2NUM(a)) || f_gt_p(v, INT2NUM(b)));
}
#define recur(fmt) \
{ \
size_t l; \
l = date__strptime_internal(&str[si], slen - si, \
fmt, sizeof fmt - 1, hash); \
if (fail_p()) \
return 0; \
si += l; \
}
VALUE date_zone_to_diff(VALUE);
static size_t
date__strptime_internal(const char *str, size_t slen,
const char *fmt, size_t flen, VALUE hash)
{
size_t si, fi;
int c;
si = fi = 0;
while (fi < flen) {
switch (fmt[fi]) {
case '%':
again:
fi++;
c = fmt[fi];
switch (c) {
case 'E':
if (fmt[fi + 1] && strchr("cCxXyY", fmt[fi + 1]))
goto again;
fi--;
goto ordinal;
case 'O':
if (fmt[fi + 1] && strchr("deHImMSuUVwWy", fmt[fi + 1]))
goto again;
fi--;
goto ordinal;
case ':':
{
int i;
for (i = 0; i < (int)sizeof_array(extz_pats); i++)
if (strncmp(extz_pats[i], &fmt[fi],
strlen(extz_pats[i])) == 0) {
fi += i;
goto again;
}
fail();
}
case 'A':
case 'a':
{
int i;
for (i = 0; i < (int)sizeof_array(day_names); i++) {
size_t l = strlen(day_names[i]);
if (strncasecmp(day_names[i], &str[si], l) == 0) {
si += l;
set_hash("wday", INT2FIX(i % 7));
goto matched;
}
}
fail();
}
case 'B':
case 'b':
case 'h':
{
int i;
for (i = 0; i < (int)sizeof_array(month_names); i++) {
size_t l = strlen(month_names[i]);
if (strncasecmp(month_names[i], &str[si], l) == 0) {
si += l;
set_hash("mon", INT2FIX((i % 12) + 1));
goto matched;
}
}
fail();
}
case 'C':
{
VALUE n;
if (NUM_PATTERN_P())
READ_DIGITS(n, 2)
else
READ_DIGITS_MAX(n)
set_hash("_cent", n);
goto matched;
}
case 'c':
recur("%a %b %e %H:%M:%S %Y");
goto matched;
case 'D':
recur("%m/%d/%y");
goto matched;
case 'd':
case 'e':
{
VALUE n;
if (str[si] == ' ') {
si++;
READ_DIGITS(n, 1);
} else {
READ_DIGITS(n, 2);
}
if (!valid_range_p(n, 1, 31))
fail();
set_hash("mday", n);
goto matched;
}
case 'F':
recur("%Y-%m-%d");
goto matched;
case 'G':
{
VALUE n;
if (NUM_PATTERN_P())
READ_DIGITS(n, 4)
else
READ_DIGITS_MAX(n)
set_hash("cwyear", n);
goto matched;
}
case 'g':
{
VALUE n;
READ_DIGITS(n, 2);
if (!valid_range_p(n, 0, 99))
fail();
set_hash("cwyear",n);
set_hash("_cent",
INT2FIX(f_ge_p(n, INT2FIX(69)) ? 19 : 20));
goto matched;
}
case 'H':
case 'k':
{
VALUE n;
if (str[si] == ' ') {
si++;
READ_DIGITS(n, 1);
} else {
READ_DIGITS(n, 2);
}
if (!valid_range_p(n, 0, 24))
fail();
set_hash("hour", n);
goto matched;
}
case 'I':
case 'l':
{
VALUE n;
if (str[si] == ' ') {
si++;
READ_DIGITS(n, 1);
} else {
READ_DIGITS(n, 2);
}
if (!valid_range_p(n, 1, 12))
fail();
set_hash("hour", n);
goto matched;
}
case 'j':
{
VALUE n;
READ_DIGITS(n, 3);
if (!valid_range_p(n, 1, 366))
fail();
set_hash("yday", n);
goto matched;
}
case 'L':
case 'N':
{
VALUE n;
int sign = 1;
size_t osi;
if (issign(str[si])) {
if (str[si] == '-')
sign = -1;
si++;
}
osi = si;
if (NUM_PATTERN_P())
READ_DIGITS(n, c == 'L' ? 3 : 9)
else
READ_DIGITS_MAX(n)
if (sign == -1)
n = f_negate(n);
set_hash("sec_fraction",
rb_rational_new2(n,
f_expt(INT2FIX(10),
ULONG2NUM(si - osi))));
goto matched;
}
case 'M':
{
VALUE n;
READ_DIGITS(n, 2);
if (!valid_range_p(n, 0, 59))
fail();
set_hash("min", n);
goto matched;
}
case 'm':
{
VALUE n;
READ_DIGITS(n, 2);
if (!valid_range_p(n, 1, 12))
fail();
set_hash("mon", n);
goto matched;
}
case 'n':
case 't':
recur(" ");
goto matched;
case 'P':
case 'p':
{
int i;
for (i = 0; i < 4; i++) {
size_t l = strlen(merid_names[i]);
if (strncasecmp(merid_names[i], &str[si], l) == 0) {
si += l;
set_hash("_merid", INT2FIX((i % 2) == 0 ? 0 : 12));
goto matched;
}
}
fail();
}
case 'Q':
{
VALUE n;
int sign = 1;
if (str[si] == '-') {
sign = -1;
si++;
}
READ_DIGITS_MAX(n);
if (sign == -1)
n = f_negate(n);
set_hash("seconds",
rb_rational_new2(n,
f_expt(INT2FIX(10),
INT2FIX(3))));
goto matched;
}
case 'R':
recur("%H:%M");
goto matched;
case 'r':
recur("%I:%M:%S %p");
goto matched;
case 'S':
{
VALUE n;
READ_DIGITS(n, 2);
if (!valid_range_p(n, 0, 60))
fail();
set_hash("sec", n);
goto matched;
}
case 's':
{
VALUE n;
int sign = 1;
if (str[si] == '-') {
sign = -1;
si++;
}
READ_DIGITS_MAX(n);
if (sign == -1)
n = f_negate(n);
set_hash("seconds", n);
goto matched;
}
case 'T':
recur("%H:%M:%S");
goto matched;
case 'U':
case 'W':
{
VALUE n;
READ_DIGITS(n, 2);
if (!valid_range_p(n, 0, 53))
fail();
set_hash(c == 'U' ? "wnum0" : "wnum1", n);
goto matched;
}
case 'u':
{
VALUE n;
READ_DIGITS(n, 1);
if (!valid_range_p(n, 1, 7))
fail();
set_hash("cwday", n);
goto matched;
}
case 'V':
{
VALUE n;
READ_DIGITS(n, 2);
if (!valid_range_p(n, 1, 53))
fail();
set_hash("cweek", n);
goto matched;
}
case 'v':
recur("%e-%b-%Y");
goto matched;
case 'w':
{
VALUE n;
READ_DIGITS(n, 1);
if (!valid_range_p(n, 0, 6))
fail();
set_hash("wday", n);
goto matched;
}
case 'X':
recur("%H:%M:%S");
goto matched;
case 'x':
recur("%m/%d/%y");
goto matched;
case 'Y':
{
VALUE n;
int sign = 1;
if (issign(str[si])) {
if (str[si] == '-')
sign = -1;
si++;
}
if (NUM_PATTERN_P())
READ_DIGITS(n, 4)
else
READ_DIGITS_MAX(n)
if (sign == -1)
n = f_negate(n);
set_hash("year", n);
goto matched;
}
case 'y':
{
VALUE n;
int sign = 1;
READ_DIGITS(n, 2);
if (!valid_range_p(n, 0, 99))
fail();
if (sign == -1)
n = f_negate(n);
set_hash("year", n);
set_hash("_cent",
INT2FIX(f_ge_p(n, INT2FIX(69)) ? 19 : 20));
goto matched;
}
case 'Z':
case 'z':
{
static const char pat_source[] =
"\\A("
"(?:gmt|utc?)?[-+]\\d+(?:[,.:]\\d+(?::\\d+)?)?"
"|[[:alpha:].\\s]+(?:standard|daylight)\\s+time\\b"
"|[[:alpha:]]+(?:\\s+dst)?\\b"
")";
static VALUE pat = Qnil;
VALUE m, b;
if (NIL_P(pat)) {
pat = rb_reg_new(pat_source, sizeof pat_source - 1,
ONIG_OPTION_IGNORECASE);
rb_gc_register_mark_object(pat);
}
b = rb_backref_get();
rb_match_busy(b);
m = f_match(pat, rb_usascii_str_new2(&str[si]));
if (!NIL_P(m)) {
VALUE s, l, o;
s = rb_reg_nth_match(1, m);
l = f_end(m, INT2FIX(0));
o = date_zone_to_diff(s);
si += NUM2LONG(l);
set_hash("zone", s);
set_hash("offset", o);
rb_backref_set(b);
goto matched;
}
rb_backref_set(b);
fail();
}
case '%':
if (str[si] != '%')
fail();
si++;
goto matched;
case '+':
recur("%a %b %e %H:%M:%S %Z %Y");
goto matched;
default:
if (str[si] != '%')
fail();
si++;
if (fi < flen)
if (str[si] != fmt[fi])
fail();
si++;
goto matched;
}
case ' ':
case '\t':
case '\n':
case '\v':
case '\f':
case '\r':
while (isspace(str[si]))
si++;
fi++;
break;
default:
ordinal:
if (str[si] != fmt[fi])
fail();
si++;
fi++;
break;
matched:
fi++;
break;
}
}
return si;
}
VALUE
date__strptime(const char *str, size_t slen,
const char *fmt, size_t flen, VALUE hash)
{
size_t si;
VALUE cent, merid;
si = date__strptime_internal(str, slen, fmt, flen, hash);
if (slen > si) {
VALUE s;
s = rb_usascii_str_new(&str[si], slen - si);
set_hash("leftover", s);
}
if (fail_p())
return Qnil;
cent = ref_hash("_cent");
if (!NIL_P(cent)) {
VALUE year;
year = ref_hash("cwyear");
if (!NIL_P(year))
set_hash("cwyear", f_add(year, f_mul(cent, INT2FIX(100))));
year = ref_hash("year");
if (!NIL_P(year))
set_hash("year", f_add(year, f_mul(cent, INT2FIX(100))));
del_hash("_cent");
}
merid = ref_hash("_merid");
if (!NIL_P(merid)) {
VALUE hour;
hour = ref_hash("hour");
if (!NIL_P(hour)) {
hour = f_mod(hour, INT2FIX(12));
set_hash("hour", f_add(hour, merid));
}
del_hash("_merid");
}
return hash;
}
/*
Local variables:
c-file-style: "ruby"
End:
*/