mirror of
https://github.com/letic/terraform-provider-google.git
synced 2024-09-19 09:39:59 +00:00
961c878e0d
Switch to using Go modules. This migrates our vendor.json to use Go 1.11's modules system, and replaces the vendor folder with the output of go mod vendor. The vendored code should remain basically the same; I believe some tree shaking of packages and support scripts/licenses/READMEs/etc. happened. This also fixes Travis and our Makefile to no longer use govendor.
386 lines
12 KiB
Go
386 lines
12 KiB
Go
package stdlib
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import (
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"bufio"
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"bytes"
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"fmt"
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"strings"
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"time"
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"github.com/zclconf/go-cty/cty"
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"github.com/zclconf/go-cty/cty/function"
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)
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var FormatDateFunc = function.New(&function.Spec{
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Params: []function.Parameter{
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{
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Name: "format",
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Type: cty.String,
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},
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{
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Name: "time",
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Type: cty.String,
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},
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},
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Type: function.StaticReturnType(cty.String),
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Impl: func(args []cty.Value, retType cty.Type) (cty.Value, error) {
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formatStr := args[0].AsString()
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timeStr := args[1].AsString()
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t, err := parseTimestamp(timeStr)
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if err != nil {
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return cty.DynamicVal, function.NewArgError(1, err)
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}
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var buf bytes.Buffer
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sc := bufio.NewScanner(strings.NewReader(formatStr))
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sc.Split(splitDateFormat)
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const esc = '\''
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for sc.Scan() {
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tok := sc.Bytes()
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// The leading byte signals the token type
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switch {
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case tok[0] == esc:
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if tok[len(tok)-1] != esc || len(tok) == 1 {
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return cty.DynamicVal, function.NewArgErrorf(0, "unterminated literal '")
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}
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if len(tok) == 2 {
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// Must be a single escaped quote, ''
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buf.WriteByte(esc)
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} else {
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// The content (until a closing esc) is printed out verbatim
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// except that we must un-double any double-esc escapes in
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// the middle of the string.
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raw := tok[1 : len(tok)-1]
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for i := 0; i < len(raw); i++ {
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buf.WriteByte(raw[i])
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if raw[i] == esc {
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i++ // skip the escaped quote
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}
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}
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}
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case startsDateFormatVerb(tok[0]):
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switch tok[0] {
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case 'Y':
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y := t.Year()
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switch len(tok) {
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case 2:
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fmt.Fprintf(&buf, "%02d", y%100)
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case 4:
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fmt.Fprintf(&buf, "%04d", y)
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: year must either be \"YY\" or \"YYYY\"", tok)
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}
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case 'M':
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m := t.Month()
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switch len(tok) {
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case 1:
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fmt.Fprintf(&buf, "%d", m)
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case 2:
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fmt.Fprintf(&buf, "%02d", m)
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case 3:
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buf.WriteString(m.String()[:3])
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case 4:
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buf.WriteString(m.String())
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: month must be \"M\", \"MM\", \"MMM\", or \"MMMM\"", tok)
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}
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case 'D':
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d := t.Day()
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switch len(tok) {
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case 1:
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fmt.Fprintf(&buf, "%d", d)
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case 2:
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fmt.Fprintf(&buf, "%02d", d)
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: day of month must either be \"D\" or \"DD\"", tok)
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}
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case 'E':
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d := t.Weekday()
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switch len(tok) {
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case 3:
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buf.WriteString(d.String()[:3])
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case 4:
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buf.WriteString(d.String())
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: day of week must either be \"EEE\" or \"EEEE\"", tok)
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}
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case 'h':
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h := t.Hour()
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switch len(tok) {
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case 1:
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fmt.Fprintf(&buf, "%d", h)
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case 2:
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fmt.Fprintf(&buf, "%02d", h)
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: 24-hour must either be \"h\" or \"hh\"", tok)
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}
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case 'H':
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h := t.Hour() % 12
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if h == 0 {
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h = 12
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}
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switch len(tok) {
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case 1:
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fmt.Fprintf(&buf, "%d", h)
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case 2:
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fmt.Fprintf(&buf, "%02d", h)
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: 12-hour must either be \"H\" or \"HH\"", tok)
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}
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case 'A', 'a':
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if len(tok) != 2 {
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: must be \"%s%s\"", tok, tok[0:1], tok[0:1])
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}
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upper := tok[0] == 'A'
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switch t.Hour() / 12 {
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case 0:
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if upper {
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buf.WriteString("AM")
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} else {
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buf.WriteString("am")
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}
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case 1:
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if upper {
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buf.WriteString("PM")
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} else {
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buf.WriteString("pm")
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}
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}
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case 'm':
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m := t.Minute()
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switch len(tok) {
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case 1:
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fmt.Fprintf(&buf, "%d", m)
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case 2:
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fmt.Fprintf(&buf, "%02d", m)
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: minute must either be \"m\" or \"mm\"", tok)
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}
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case 's':
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s := t.Second()
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switch len(tok) {
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case 1:
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fmt.Fprintf(&buf, "%d", s)
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case 2:
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fmt.Fprintf(&buf, "%02d", s)
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: second must either be \"s\" or \"ss\"", tok)
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}
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case 'Z':
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// We'll just lean on Go's own formatter for this one, since
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// the necessary information is unexported.
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switch len(tok) {
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case 1:
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buf.WriteString(t.Format("Z07:00"))
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case 3:
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str := t.Format("-0700")
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switch str {
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case "+0000":
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buf.WriteString("UTC")
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default:
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buf.WriteString(str)
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}
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case 4:
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buf.WriteString(t.Format("-0700"))
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case 5:
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buf.WriteString(t.Format("-07:00"))
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q: timezone must be Z, ZZZZ, or ZZZZZ", tok)
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}
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default:
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return cty.DynamicVal, function.NewArgErrorf(0, "invalid date format verb %q", tok)
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}
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default:
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// Any other starting character indicates a literal sequence
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buf.Write(tok)
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}
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}
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return cty.StringVal(buf.String()), nil
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},
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})
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// FormatDate reformats a timestamp given in RFC3339 syntax into another time
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// syntax defined by a given format string.
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//
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// The format string uses letter mnemonics to represent portions of the
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// timestamp, with repetition signifying length variants of each portion.
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// Single quote characters ' can be used to quote sequences of literal letters
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// that should not be interpreted as formatting mnemonics.
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//
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// The full set of supported mnemonic sequences is listed below:
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//
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// YY Year modulo 100 zero-padded to two digits, like "06".
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// YYYY Four (or more) digit year, like "2006".
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// M Month number, like "1" for January.
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// MM Month number zero-padded to two digits, like "01".
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// MMM English month name abbreviated to three letters, like "Jan".
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// MMMM English month name unabbreviated, like "January".
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// D Day of month number, like "2".
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// DD Day of month number zero-padded to two digits, like "02".
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// EEE English day of week name abbreviated to three letters, like "Mon".
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// EEEE English day of week name unabbreviated, like "Monday".
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// h 24-hour number, like "2".
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// hh 24-hour number zero-padded to two digits, like "02".
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// H 12-hour number, like "2".
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// HH 12-hour number zero-padded to two digits, like "02".
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// AA Hour AM/PM marker in uppercase, like "AM".
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// aa Hour AM/PM marker in lowercase, like "am".
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// m Minute within hour, like "5".
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// mm Minute within hour zero-padded to two digits, like "05".
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// s Second within minute, like "9".
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// ss Second within minute zero-padded to two digits, like "09".
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// ZZZZ Timezone offset with just sign and digit, like "-0800".
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// ZZZZZ Timezone offset with colon separating hours and minutes, like "-08:00".
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// Z Like ZZZZZ but with a special case "Z" for UTC.
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// ZZZ Like ZZZZ but with a special case "UTC" for UTC.
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//
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// The format syntax is optimized mainly for generating machine-oriented
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// timestamps rather than human-oriented timestamps; the English language
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// portions of the output reflect the use of English names in a number of
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// machine-readable date formatting standards. For presentation to humans,
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// a locale-aware time formatter (not included in this package) is a better
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// choice.
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//
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// The format syntax is not compatible with that of any other language, but
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// is optimized so that patterns for common standard date formats can be
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// recognized quickly even by a reader unfamiliar with the format syntax.
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func FormatDate(format cty.Value, timestamp cty.Value) (cty.Value, error) {
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return FormatDateFunc.Call([]cty.Value{format, timestamp})
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}
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func parseTimestamp(ts string) (time.Time, error) {
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t, err := time.Parse(time.RFC3339, ts)
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if err != nil {
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switch err := err.(type) {
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case *time.ParseError:
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// If err is s time.ParseError then its string representation is not
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// appropriate since it relies on details of Go's strange date format
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// representation, which a caller of our functions is not expected
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// to be familiar with.
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//
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// Therefore we do some light transformation to get a more suitable
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// error that should make more sense to our callers. These are
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// still not awesome error messages, but at least they refer to
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// the timestamp portions by name rather than by Go's example
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// values.
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if err.LayoutElem == "" && err.ValueElem == "" && err.Message != "" {
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// For some reason err.Message is populated with a ": " prefix
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// by the time package.
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return time.Time{}, fmt.Errorf("not a valid RFC3339 timestamp%s", err.Message)
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}
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var what string
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switch err.LayoutElem {
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case "2006":
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what = "year"
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case "01":
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what = "month"
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case "02":
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what = "day of month"
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case "15":
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what = "hour"
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case "04":
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what = "minute"
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case "05":
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what = "second"
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case "Z07:00":
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what = "UTC offset"
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case "T":
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return time.Time{}, fmt.Errorf("not a valid RFC3339 timestamp: missing required time introducer 'T'")
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case ":", "-":
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if err.ValueElem == "" {
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return time.Time{}, fmt.Errorf("not a valid RFC3339 timestamp: end of string where %q is expected", err.LayoutElem)
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} else {
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return time.Time{}, fmt.Errorf("not a valid RFC3339 timestamp: found %q where %q is expected", err.ValueElem, err.LayoutElem)
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}
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default:
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// Should never get here, because time.RFC3339 includes only the
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// above portions, but since that might change in future we'll
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// be robust here.
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what = "timestamp segment"
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}
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if err.ValueElem == "" {
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return time.Time{}, fmt.Errorf("not a valid RFC3339 timestamp: end of string before %s", what)
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} else {
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return time.Time{}, fmt.Errorf("not a valid RFC3339 timestamp: cannot use %q as %s", err.ValueElem, what)
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}
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}
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return time.Time{}, err
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}
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return t, nil
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}
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// splitDataFormat is a bufio.SplitFunc used to tokenize a date format.
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func splitDateFormat(data []byte, atEOF bool) (advance int, token []byte, err error) {
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if len(data) == 0 {
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return 0, nil, nil
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}
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const esc = '\''
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switch {
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case data[0] == esc:
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// If we have another quote immediately after then this is a single
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// escaped escape.
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if len(data) > 1 && data[1] == esc {
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return 2, data[:2], nil
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}
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// Beginning of quoted sequence, so we will seek forward until we find
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// the closing quote, ignoring escaped quotes along the way.
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for i := 1; i < len(data); i++ {
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if data[i] == esc {
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if (i + 1) == len(data) {
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// We need at least one more byte to decide if this is an
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// escape or a terminator.
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return 0, nil, nil
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}
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if data[i+1] == esc {
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i++ // doubled-up quotes are an escape sequence
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continue
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}
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// We've found the closing quote
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return i + 1, data[:i+1], nil
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}
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}
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// If we fall out here then we need more bytes to find the end,
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// unless we're already at the end with an unclosed quote.
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if atEOF {
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return len(data), data, nil
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}
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return 0, nil, nil
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case startsDateFormatVerb(data[0]):
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rep := data[0]
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for i := 1; i < len(data); i++ {
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if data[i] != rep {
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return i, data[:i], nil
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}
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}
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if atEOF {
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return len(data), data, nil
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}
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// We need more data to decide if we've found the end
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return 0, nil, nil
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default:
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for i := 1; i < len(data); i++ {
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if data[i] == esc || startsDateFormatVerb(data[i]) {
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return i, data[:i], nil
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}
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}
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// We might not actually be at the end of a literal sequence,
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// but that doesn't matter since we'll concat them back together
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// anyway.
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return len(data), data, nil
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}
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}
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func startsDateFormatVerb(b byte) bool {
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return (b >= 'a' && b <= 'z') || (b >= 'A' && b <= 'Z')
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}
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