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https://github.com/danog/liquid.git
synced 2024-11-30 06:39:02 +01:00
Replace extern "C" strftime by go implementation
This commit is contained in:
Oliver Steele
parent
8d53a6b4a8
commit
85bd1ddfe1
@ -1,46 +1,238 @@
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// Package strftime wraps the C stdlib strftime and strptime functions.
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package strftime
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/*
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#include <stdlib.h>
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#include <time.h>
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#include <errno.h>
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int read_errno() { return errno; }
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*/
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import "C"
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import (
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"syscall"
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"fmt"
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"regexp"
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"strconv"
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"strings"
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"time"
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"unsafe"
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"unicode/utf8"
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)
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// Note: The use of errno below is not thread-safe.
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//
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// Even if we added a mutex, it would not be thread-safe
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// relative to other C stdlib calls that don't use that mutex.
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//
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// OTOH, I can't find a format string that C strftime thinks is illegal
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// to test this with, so maybe this is a non-issue
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// Strftime wraps the C Strftime function
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// Strftime clones Ruby's Time.strftime
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func Strftime(format string, t time.Time) (string, error) {
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var (
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_, offset = t.Zone()
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tz = t.Location()
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secs = t.Sub(time.Date(1970, 1, 1, 0, 0, 0, 0, tz)).Seconds() - float64(offset)
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tt = C.time_t(secs)
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tm = C.struct_tm{}
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cFormat = C.CString(format)
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cOut [256]C.char
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)
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defer C.free(unsafe.Pointer(cFormat)) // nolint: gas
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C.localtime_r(&tt, &tm)
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size := C.strftime(&cOut[0], C.size_t(len(cOut)), cFormat, &tm)
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if size == 0 {
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// If size == 0 there *might* be an error.
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if errno := C.read_errno(); errno != 0 {
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return "", syscall.Errno(errno)
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return re.ReplaceAllStringFunc(format, func(directive string) string {
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var (
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m = re.FindAllStringSubmatch(directive, 1)[0]
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flags = m[1]
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width = m[2]
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conversion, _ = utf8.DecodeRuneInString(m[3])
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c = replaceComponent(t, conversion, flags, width)
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pad, w = '0', 2
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)
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if s, ok := c.(string); ok {
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return s
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}
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}
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return C.GoString(&cOut[0]), nil
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if f, ok := padding[conversion]; ok {
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pad, w = f.c, f.w
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}
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switch flags {
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case "-":
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w = 0
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case "_":
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pad = ' '
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case "0":
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pad = '0'
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}
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if len(width) > 0 {
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w, _ = strconv.Atoi(width) // nolint: gas
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}
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fm := fmt.Sprintf("%%%c%dd", pad, w)
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if pad == '-' {
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fm = fmt.Sprintf("%%%dd", w)
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}
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s := fmt.Sprintf(fm, c)
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switch flags {
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case "^":
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return strings.ToUpper(s)
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// case "#":
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default:
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return s
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}
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}), nil
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}
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var re = regexp.MustCompile(`%([-_0]|::?)?(\d+)?[EO]?([a-zA-Z\+nt%])`)
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var amPmTable = map[bool]string{true: "AM", false: "PM"}
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var amPmLowerTable = map[bool]string{true: "am", false: "pm"}
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var padding = map[rune]struct {
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c rune
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w int
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}{
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'e': {'-', 2},
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'f': {'0', 6},
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'j': {'0', 3},
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'k': {'-', 2},
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'L': {'0', 3},
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'l': {'-', 2},
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'N': {'0', 9},
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'u': {'-', 0},
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'w': {'-', 0},
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'Y': {'0', 4},
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}
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func replaceComponent(t time.Time, c rune, flags, width string) interface{} { // nolint: gocyclo
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switch c {
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// Date
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case 'Y':
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return t.Year()
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case 'y':
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return t.Year() % 100
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case 'C':
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return t.Year() / 100
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case 'm':
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return t.Month()
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case 'B':
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return t.Month().String()
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case 'b', 'h':
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return t.Month().String()[:3]
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case 'd', 'e':
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return t.Day()
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case 'j':
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return t.YearDay()
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// Time
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case 'H', 'k':
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return t.Hour()
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case 'I', 'l':
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return (t.Hour()+11)%12 + 1
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case 'M':
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return t.Minute()
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case 'S':
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return t.Second()
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case 'L':
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return t.Nanosecond() / 1e6
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case 'N':
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ns := t.Nanosecond()
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if len(width) > 0 {
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w, _ := strconv.Atoi(width) // nolint: gas
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if w <= 9 {
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return fmt.Sprintf("%09d", ns)[:w]
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}
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return fmt.Sprintf(fmt.Sprintf("%%09d%%0%dd", w-9), ns, 0)
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}
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return ns
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case 'P':
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return amPmLowerTable[t.Hour() < 12]
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case 'p':
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return amPmTable[t.Hour() < 12]
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// Time zone
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case 'z':
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_, offset := t.Zone()
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var (
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h = offset / 3600
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m = (offset / 60) % 60
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)
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switch flags {
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case ":":
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return fmt.Sprintf("%+03d:%02d", h, m)
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case "::":
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return fmt.Sprintf("%+03d:%02d:%02d", h, m, offset%60)
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default:
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return fmt.Sprintf("%+03d%02d", h, m)
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}
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case 'Z':
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z, _ := t.Zone()
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return z
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// Weekday
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case 'A':
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return t.Weekday().String()
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case 'a':
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return t.Weekday().String()[:3]
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case 'u':
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return (t.Weekday()+6)%7 + 1
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case 'w':
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return t.Weekday()
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// ISO Year
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case 'G':
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y, _ := t.ISOWeek()
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return y
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case 'g':
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y, _ := t.ISOWeek()
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return y % 100
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case 'V':
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_, wn := t.ISOWeek()
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return wn
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// ISO Week
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case 'U':
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t = t.Add(24 * time.Hour)
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y, wn := t.ISOWeek()
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if y < t.Year() {
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wn = 0
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}
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return wn
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case 'W':
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y, wn := t.ISOWeek()
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if y < t.Year() {
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wn = 0
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}
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return wn
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// Epoch seconds
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case 's':
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return t.Unix()
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case 'Q':
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return t.UnixNano() / 1000
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// Literals
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case 'n':
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return "\n"
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case 't':
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return "\t"
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case '%':
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return "%"
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// Combinations
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case 'c':
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// date and time (%a %b %e %T %Y)
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h, m, s := t.Clock()
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return fmt.Sprintf("%s %s %2d %02d:%02d:%02d %04d", t.Weekday().String()[:3], t.Month().String()[:3], t.Day(), h, m, s, t.Year())
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case 'D', 'x':
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// Date (%m/%d/%y)
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y, m, d := t.Date()
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return fmt.Sprintf("%02d/%02d/%02d", m, d, y%100)
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case 'F':
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// The ISO 8601 date format (%Y-%m-%d)
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y, m, d := t.Date()
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return fmt.Sprintf("%04d-%02d-%02d", y, m, d)
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case 'v':
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// VMS date (%e-%b-%Y)
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return fmt.Sprintf("%2d-%s-%04d", t.Day(), t.Month().String()[:3], t.Year())
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case 'f':
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return t.Nanosecond() / 1e3
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case 'r':
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// 12-hour time (%I:%M:%S %p)
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h, m, s := t.Clock()
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h12 := (h+11)%12 + 1
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return fmt.Sprintf("%02d:%02d:%02d %s", h12, m, s, amPmTable[h < 12])
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case 'R':
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// 24-hour time (%H:%M)
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h, m, _ := t.Clock()
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return fmt.Sprintf("%02d:%02d", h, m)
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case 'T', 'X':
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// 24-hour time (%H:%M:%S)
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h, m, s := t.Clock()
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return fmt.Sprintf("%02d:%02d:%02d", h, m, s)
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case '+':
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// date(1) (%a %b %e %H:%M:%S %Z %Y)
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s, err := Strftime("%a %b %e %H:%M:%S %Z %Y", t)
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if err != nil {
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panic(err)
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}
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return s
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default:
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return fmt.Sprintf("%%%c", c)
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}
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}
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@ -19,17 +19,39 @@ func timeMustParse(f, s string) time.Time {
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}
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var conversionTests = []struct{ format, expect string }{
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// {"%1N"},
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// {"%3N"},
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// {"%6N"},
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// {"%9N"},
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{"%1N", "1"},
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{"%3N", "123"},
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{"%6N", "123456"},
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{"%9N", "123456789"},
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{"%12N", "123456789000"},
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{"%v", " 2-Jan-2006"},
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{"%Z", "EST"},
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// {"%:z", "-05:00"},
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// {"%::z", "-05:00:00"},
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{"%:z", "-05:00"},
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{"%::z", "-05:00:00"},
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{"%%", "%"},
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}
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var dayOfWeekTests = []string{
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"%A=Sunday %a=Sun %u=7 %w=0 %d=01 %e= 1 %j=001 %U=01 %V=52 %W=00",
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"%A=Monday %a=Mon %u=1 %w=1 %d=02 %e= 2 %j=002 %U=01 %V=01 %W=01",
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"%A=Tuesday %a=Tue %u=2 %w=2 %d=03 %e= 3 %j=003 %U=01 %V=01 %W=01",
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"%A=Wednesday %a=Wed %u=3 %w=3 %d=04 %e= 4 %j=004 %U=01 %V=01 %W=01",
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"%A=Thursday %a=Thu %u=4 %w=4 %d=05 %e= 5 %j=005 %U=01 %V=01 %W=01",
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"%A=Friday %a=Fri %u=5 %w=5 %d=06 %e= 6 %j=006 %U=01 %V=01 %W=01",
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"%A=Saturday %a=Sat %u=6 %w=6 %d=07 %e= 7 %j=007 %U=01 %V=01 %W=01",
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}
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var hourTests = []struct {
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hour int
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expect string
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}{
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{0, "%H=00 %k= 0 %I=12 %l=12 %P=am %p=AM"},
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{1, "%H=01 %k= 1 %I=01 %l= 1 %P=am %p=AM"},
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{12, "%H=12 %k=12 %I=12 %l=12 %P=pm %p=PM"},
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{13, "%H=13 %k=13 %I=01 %l= 1 %P=pm %p=PM"},
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{23, "%H=23 %k=23 %I=11 %l=11 %P=pm %p=PM"},
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}
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func TestStrftime(t *testing.T) {
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require.NoError(t, os.Setenv("TZ", "America/New_York"))
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@ -63,28 +85,13 @@ func TestStrftime(t *testing.T) {
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if skip[format] {
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continue
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}
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name := fmt.Sprintf("Strftime %q (cf. Ruby)", format)
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name := fmt.Sprintf("Strftime %q", format)
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actual, err := Strftime(format, dt)
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require.NoErrorf(t, err, name)
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require.Equalf(t, expect, actual, name)
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}
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ins := []struct{ source, expect string }{
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{"02 Jan 06 15:04 UTC", "02 Jan 06 10:04 EST"},
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{"02 Jan 06 15:04 EST", "02 Jan 06 15:04 EST"},
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{"02 Jan 06 15:04 EDT", "02 Jan 06 14:04 EST"},
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// {"02 Jan 06 15:04 MST", "02 Jan 06 10:04 EST"},
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{"14 Mar 16 12:00 UTC", "14 Mar 16 08:00 EDT"},
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// {"14 Mar 16 00:00 UTC", "14 Mar 16 00:00 UTC"},
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}
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for _, test := range ins {
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rt := timeMustParse(time.RFC822, test.source)
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actual, err := Strftime("%d %b %y %H:%M %Z", rt)
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require.NoErrorf(t, err, test.source)
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require.Equalf(t, test.expect, actual, test.source)
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}
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dt = timeMustParse(time.RFC822, "02 Jan 06 15:04 MST")
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dt = timeMustParse(time.RFC1123Z, "Mon, 02 Jan 2006 15:04:05 -0500")
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tests := []struct{ format, expect string }{
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{"%a, %b %d, %Y", "Mon, Jan 02, 2006"},
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{"%Y/%m/%d", "2006/01/02"},
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@ -100,3 +107,42 @@ func TestStrftime(t *testing.T) {
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require.Equalf(t, test.expect, s, test.format)
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}
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}
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func TestStrftime_dow(t *testing.T) {
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require.NoError(t, os.Setenv("TZ", "America/New_York"))
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for day, expect := range dayOfWeekTests {
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dt := time.Date(2006, 01, day+1, 15, 4, 5, 0, time.UTC)
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format := "%%A=%A %%a=%a %%u=%u %%w=%w %%d=%d %%e=%e %%j=%j %%U=%U %%V=%V %%W=%W"
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name := fmt.Sprintf("%s.Strftime", dt)
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actual, err := Strftime(format, dt)
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require.NoErrorf(t, err, name)
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require.Equalf(t, expect, actual, name)
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}
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}
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func TestStrftime_hours(t *testing.T) {
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require.NoError(t, os.Setenv("TZ", "America/New_York"))
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for _, test := range hourTests {
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dt := time.Date(2006, 01, 2, test.hour, 4, 5, 0, time.UTC)
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format := "%%H=%H %%k=%k %%I=%I %%l=%l %%P=%P %%p=%p"
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name := fmt.Sprintf("%s.Strftime", dt)
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actual, err := Strftime(format, dt)
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require.NoErrorf(t, err, name)
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require.Equalf(t, test.expect, actual, name)
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}
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}
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func TestStrftime_zones(t *testing.T) {
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require.NoError(t, os.Setenv("TZ", "America/New_York"))
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ins := []struct{ source, expect string }{
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{"02 Jan 06 15:04 UTC", "%z=+0000 %Z=UTC"},
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{"02 Jan 06 15:04 EST", "%z=-0500 %Z=EST"},
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{"02 Jul 06 15:04 EDT", "%z=-0400 %Z=EDT"},
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}
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for _, test := range ins {
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rt := timeMustParse(time.RFC822, test.source)
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actual, err := Strftime("%%z=%z %%Z=%Z", rt)
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require.NoErrorf(t, err, test.source)
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require.Equalf(t, test.expect, actual, test.source)
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}
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}
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