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#include "date.h"
#include "janet.h"
// wrappers around struct tm
static JanetMethod jd_tm_methods[] = {
{"mktime", jd_mktime},
{"mktime!", jd_mktime_inplace},
{"normalize", jd_mktime_inplace},
{"strftime", jd_strftime},
{NULL, NULL},
};
static int jd_tm_compare(void *lhs, void *rhs) {
struct tm lhp = (*(struct tm*)lhs);
struct tm rhp = (*(struct tm*)rhs);
time_t lhv = mktime(&lhp);
time_t rhv = mktime(&rhp);
return difftime(lhv, rhv);
}
// C99 specifies ALL fields to be int
struct jd_tm_key {
const char *key;
const size_t off;
};
static const struct jd_tm_key jd_tm_keys[] = {
{"sec", offsetof(struct tm, tm_sec)},
{"min", offsetof(struct tm, tm_min)},
{"hour", offsetof(struct tm, tm_hour)},
{"mday", offsetof(struct tm, tm_mday)},
{"mon", offsetof(struct tm, tm_mon)},
{"year", offsetof(struct tm, tm_year)},
{"wday", offsetof(struct tm, tm_wday)},
{"yday", offsetof(struct tm, tm_yday)},
{"isdst", offsetof(struct tm, tm_isdst)},
{NULL, 0},
};
static int jd_tm_get(void *p, Janet key, Janet *out) {
if (!janet_checktype(key, JANET_KEYWORD)) {
return 0;
}
// is it a method?
if(janet_getmethod(janet_unwrap_keyword(key), jd_tm_methods, out)) {
return 1;
}
const struct jd_tm_key *ptr = jd_tm_keys;
while (ptr->key) {
if (janet_keyeq(key, ptr->key)) {
int val = *((int*)(p + ptr->off));
// exceptional values
if (janet_keyeq(key, "year")) {
val += 1900;
} else if (janet_keyeq(key, "isdst")) {
*out = val ? (val > 0 ? janet_wrap_true() : janet_ckeywordv("detect")) : janet_wrap_false();
return 1;
}
*out = janet_wrap_integer(val);
return 1;
}
ptr++;
}
return janet_checktype(*out, JANET_NIL);
}
static Janet jd_tm_next(void *p, Janet key) {
(void) p;
const struct jd_tm_key *ptr = jd_tm_keys;
while (ptr->key) {
if (janet_keyeq(key, ptr->key)) {
return (++ptr)->key ? janet_ckeywordv(ptr->key) : janet_wrap_nil();
}
ptr++;
}
return janet_ckeywordv(jd_tm_keys[0].key);
}
static void jd_tm_put(void *data, Janet key, Janet value) {
// note that keyword, boolean are only valid for isdst
if (!janet_checktypes(value, JANET_TFLAG_NUMBER | JANET_TFLAG_KEYWORD | JANET_TFLAG_BOOLEAN)) {
janet_panicf("expected function or number, got %t", value);
}
const struct jd_tm_key *ptr = jd_tm_keys;
while (ptr->key) {
if (janet_keyeq(key, ptr->key)) {
int *loc = (int*)(data + ptr->off);
if (janet_keyeq(key, "year")) {
*loc = janet_unwrap_integer(value) - 1900;
} else if (janet_keyeq(key, "isdst")) {
*loc = janet_keyeq(value, "detect") ? -1 : (janet_truthy(value) ? 1 : 0);
} else {
*loc = janet_unwrap_integer(value);
}
return;
}
ptr++;
}
janet_panicf("tried to write to invalid field: %v", key);
}
#define MAX_INT_STRLEN 1024
static void jd_tm_tostring(void *p, JanetBuffer *buffer) {
janet_buffer_push_cstring(buffer, "{");
char buf[MAX_INT_STRLEN];
const struct jd_tm_key *ptr = jd_tm_keys;
while (ptr->key) {
int *loc = (int*)(p + ptr->off);
janet_buffer_push_cstring(buffer, ":");
janet_buffer_push_cstring(buffer, ptr->key);
janet_buffer_push_cstring(buffer, " ");
// exceptional values
if (!strcmp(ptr->key, "year")) {
snprintf(buf, MAX_INT_STRLEN, "%d", *loc + 1900);
} else if (!strcmp(ptr->key, "isdst")) {
strcpy(buf, *loc ? (*loc > 0 ? "true" : ":detect") : "false");
} else {
snprintf(buf, MAX_INT_STRLEN, "%d", *loc);
}
janet_buffer_push_cstring(buffer, buf);
if ((++ptr)->key) janet_buffer_push_cstring(buffer, " ");
}
janet_buffer_push_cstring(buffer, "}");
}
static const JanetAbstractType jd_tm_t = {
"tm",
NULL,
NULL,
jd_tm_get,
jd_tm_put,
NULL,
NULL,
jd_tm_tostring,
jd_tm_compare,
NULL,
jd_tm_next,
JANET_ATEND_NEXT
};
struct tm *jd_gettm(Janet *argv, int32_t n) {
return (struct tm*)janet_getabstract(argv, n, &jd_tm_t);
}
struct tm *jd_maketm(void) {
return janet_abstract(&jd_tm_t, sizeof(struct tm));
}
JANET_FN(jd_mktime,
"",
"") {
janet_fixarity(argc, 1);
struct tm *tm = jd_gettm(argv, 0);
struct tm *nw = jd_maketm();
*nw = *tm;
time_t *time = jd_maketime();
*time = mktime(nw);
return janet_wrap_abstract(time);
}
JANET_FN(jd_mktime_inplace,
"",
"") {
janet_fixarity(argc, 1);
struct tm *tm = jd_gettm(argv, 0);
time_t *time = jd_maketime();
*time = mktime(tm);
return janet_wrap_abstract(time);
}
// strftime
struct strftime_format {
const char *keyword;
const char *format;
};
const static struct strftime_format strftime_formats[] = {
{NULL, NULL},
};
JANET_FN(jd_strftime,
"",
"") {
janet_fixarity(argc, 2);
// tm is first for pseudo-OO
struct tm *tm = jd_gettm(argv, 0);
// determine format
const char *format = NULL;
// is it a preset?
if (janet_checktype(argv[1], JANET_KEYWORD)) {
const struct strftime_format *ptr = strftime_formats;
while (ptr->keyword) {
if (janet_keyeq(argv[1], ptr->keyword)) {
format = ptr->format;
break;
}
ptr++;
}
}
// preset not found
if (!format) format = janet_getcbytes(argv, 1);
return janet_wrap_buffer(strftime_buffer(format, tm, NULL));
}
const JanetRegExt jd_tm_cfuns[] = {
JANET_REG("mktime", jd_mktime),
JANET_REG("mktime!", jd_mktime_inplace),
JANET_REG("strftime", jd_strftime),
JANET_REG_END
};
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