mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-23 00:46:23 +01:00
374 lines
8.5 KiB
Go
374 lines
8.5 KiB
Go
package flagutil
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import (
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"flag"
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"fmt"
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"strconv"
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"strings"
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"time"
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)
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// NewArrayString returns new ArrayString with the given name and description.
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func NewArrayString(name, description string) *ArrayString {
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description += "\nSupports an `array` of values separated by comma or specified via multiple flags."
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var a ArrayString
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flag.Var(&a, name, description)
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return &a
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}
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// NewArrayDuration returns new ArrayDuration with the given name and description.
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func NewArrayDuration(name, description string) *ArrayDuration {
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description += "\nSupports `array` of values separated by comma or specified via multiple flags."
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var a ArrayDuration
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flag.Var(&a, name, description)
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return &a
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}
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// NewArrayBool returns new ArrayBool with the given name and description.
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func NewArrayBool(name, description string) *ArrayBool {
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description += "\nSupports `array` of values separated by comma or specified via multiple flags."
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var a ArrayBool
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flag.Var(&a, name, description)
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return &a
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}
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// NewArrayInt returns new ArrayInt with the given name and description.
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func NewArrayInt(name, description string) *ArrayInt {
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description += "\nSupports `array` of values separated by comma or specified via multiple flags."
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var a ArrayInt
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flag.Var(&a, name, description)
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return &a
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}
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// NewArrayBytes returns new ArrayBytes with the given name and description.
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func NewArrayBytes(name, description string) *ArrayBytes {
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description += "\nSupports the following optional suffixes for size values: KB, MB, GB, TB, KiB, MiB, GiB, TiB."
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description += "\nSupports `array` of values separated by comma or specified via multiple flags."
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var a ArrayBytes
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flag.Var(&a, name, description)
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return &a
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}
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// ArrayString is a flag that holds an array of strings.
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//
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// It may be set either by specifying multiple flags with the given name
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// passed to NewArray or by joining flag values by comma.
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//
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// The following example sets equivalent flag array with two items (value1, value2):
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//
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// -foo=value1 -foo=value2
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// -foo=value1,value2
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//
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// Each flag value may contain commas inside single quotes, double quotes, [], () or {} braces.
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// For example, -foo=[a,b,c] defines a single command-line flag with `[a,b,c]` value.
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//
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// Flag values may be quoted. For instance, the following arg creates an array of ("a", "b,c") items:
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//
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// -foo='a,"b,c"'
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type ArrayString []string
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// String implements flag.Value interface
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func (a *ArrayString) String() string {
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aEscaped := make([]string, len(*a))
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for i, v := range *a {
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if strings.ContainsAny(v, `,'"{[(`+"\n") {
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v = fmt.Sprintf("%q", v)
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}
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aEscaped[i] = v
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}
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return strings.Join(aEscaped, ",")
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}
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// Set implements flag.Value interface
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func (a *ArrayString) Set(value string) error {
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values := parseArrayValues(value)
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*a = append(*a, values...)
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return nil
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}
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func parseArrayValues(s string) []string {
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if len(s) == 0 {
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return nil
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}
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var values []string
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for {
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v, tail := getNextArrayValue(s)
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values = append(values, v)
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if len(tail) == 0 {
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return values
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}
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s = tail
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if s[0] == ',' {
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s = s[1:]
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}
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}
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}
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var closeQuotes = map[byte]byte{
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'"': '"',
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'\'': '\'',
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'[': ']',
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'{': '}',
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'(': ')',
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}
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func getNextArrayValue(s string) (string, string) {
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v, tail := getNextArrayValueMaybeQuoted(s)
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if strings.HasPrefix(v, `"`) && strings.HasSuffix(v, `"`) {
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vUnquoted, err := strconv.Unquote(v)
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if err == nil {
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return vUnquoted, tail
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}
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v = v[1 : len(v)-1]
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v = strings.ReplaceAll(v, `\"`, `"`)
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v = strings.ReplaceAll(v, `\\`, `\`)
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return v, tail
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}
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if strings.HasPrefix(v, `'`) && strings.HasSuffix(v, `'`) {
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v = v[1 : len(v)-1]
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v = strings.ReplaceAll(v, `\'`, "'")
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v = strings.ReplaceAll(v, `\\`, `\`)
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return v, tail
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}
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return v, tail
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}
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func getNextArrayValueMaybeQuoted(s string) (string, string) {
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idx := 0
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for {
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n := strings.IndexAny(s[idx:], `,"'[{(`)
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if n < 0 {
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// The last item
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return s, ""
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}
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idx += n
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ch := s[idx]
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if ch == ',' {
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// The next item
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return s[:idx], s[idx:]
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}
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idx++
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m := indexCloseQuote(s[idx:], closeQuotes[ch])
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idx += m
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}
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}
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func indexCloseQuote(s string, closeQuote byte) int {
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if closeQuote == '"' || closeQuote == '\'' {
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idx := 0
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for {
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n := strings.IndexByte(s[idx:], closeQuote)
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if n < 0 {
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return 0
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}
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idx += n
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if n := getTrailingBackslashesCount(s[:idx]); n%2 == 1 {
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// The quote is escaped with backslash. Skip it
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idx++
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continue
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}
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return idx + 1
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}
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}
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idx := 0
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for {
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n := strings.IndexAny(s[idx:], `"'[{()}]`)
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if n < 0 {
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return 0
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}
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idx += n
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ch := s[idx]
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if ch == closeQuote {
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return idx + 1
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}
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idx++
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m := indexCloseQuote(s[idx:], closeQuotes[ch])
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if m == 0 {
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return 0
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}
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idx += m
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}
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}
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func getTrailingBackslashesCount(s string) int {
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n := len(s)
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for n > 0 && s[n-1] == '\\' {
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n--
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}
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return len(s) - n
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}
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// GetOptionalArg returns optional arg under the given argIdx.
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func (a *ArrayString) GetOptionalArg(argIdx int) string {
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x := *a
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if argIdx >= len(x) {
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if len(x) == 1 {
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return x[0]
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}
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return ""
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}
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return x[argIdx]
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}
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// ArrayBool is a flag that holds an array of booleans values.
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//
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// Has the same api as ArrayString.
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type ArrayBool []bool
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// IsBoolFlag implements flag.IsBoolFlag interface
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func (a *ArrayBool) IsBoolFlag() bool { return true }
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// String implements flag.Value interface
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func (a *ArrayBool) String() string {
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formattedBools := make([]string, len(*a))
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for i, v := range *a {
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formattedBools[i] = strconv.FormatBool(v)
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}
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return strings.Join(formattedBools, ",")
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}
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// Set implements flag.Value interface
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func (a *ArrayBool) Set(value string) error {
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values := parseArrayValues(value)
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for _, v := range values {
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b, err := strconv.ParseBool(v)
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if err != nil {
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return err
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}
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*a = append(*a, b)
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}
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return nil
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}
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// GetOptionalArg returns optional arg under the given argIdx.
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func (a *ArrayBool) GetOptionalArg(argIdx int) bool {
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x := *a
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if argIdx >= len(x) {
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if len(x) == 1 {
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return x[0]
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}
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return false
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}
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return x[argIdx]
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}
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// ArrayDuration is a flag that holds an array of time.Duration values.
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//
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// Has the same api as ArrayString.
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type ArrayDuration []time.Duration
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// String implements flag.Value interface
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func (a *ArrayDuration) String() string {
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formattedBools := make([]string, len(*a))
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for i, v := range *a {
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formattedBools[i] = v.String()
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}
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return strings.Join(formattedBools, ",")
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}
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// Set implements flag.Value interface
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func (a *ArrayDuration) Set(value string) error {
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values := parseArrayValues(value)
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for _, v := range values {
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b, err := time.ParseDuration(v)
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if err != nil {
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return err
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}
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*a = append(*a, b)
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}
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return nil
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}
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// GetOptionalArgOrDefault returns optional arg under the given argIdx,
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// or default value, if argIdx not found.
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func (a *ArrayDuration) GetOptionalArgOrDefault(argIdx int, defaultValue time.Duration) time.Duration {
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x := *a
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if argIdx >= len(x) {
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if len(x) == 1 {
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return x[0]
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}
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return defaultValue
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}
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return x[argIdx]
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}
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// ArrayInt is flag that holds an array of ints.
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//
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// Has the same api as ArrayString.
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type ArrayInt []int
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// String implements flag.Value interface
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func (a *ArrayInt) String() string {
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x := *a
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formattedInts := make([]string, len(x))
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for i, v := range x {
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formattedInts[i] = strconv.Itoa(v)
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}
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return strings.Join(formattedInts, ",")
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}
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// Set implements flag.Value interface
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func (a *ArrayInt) Set(value string) error {
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values := parseArrayValues(value)
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for _, v := range values {
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n, err := strconv.Atoi(v)
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if err != nil {
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return err
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}
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*a = append(*a, n)
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}
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return nil
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}
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// GetOptionalArgOrDefault returns optional arg under the given argIdx.
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func (a *ArrayInt) GetOptionalArgOrDefault(argIdx, defaultValue int) int {
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x := *a
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if argIdx < len(x) {
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return x[argIdx]
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}
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if len(x) == 1 {
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return x[0]
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}
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return defaultValue
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}
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// ArrayBytes is flag that holds an array of Bytes.
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//
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// Has the same api as ArrayString.
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type ArrayBytes []*Bytes
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// String implements flag.Value interface
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func (a *ArrayBytes) String() string {
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x := *a
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formattedBytes := make([]string, len(x))
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for i, v := range x {
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formattedBytes[i] = v.String()
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}
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return strings.Join(formattedBytes, ",")
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}
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// Set implemented flag.Value interface
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func (a *ArrayBytes) Set(value string) error {
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values := parseArrayValues(value)
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for _, v := range values {
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var b Bytes
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if err := b.Set(v); err != nil {
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return err
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}
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*a = append(*a, &b)
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}
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return nil
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}
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// GetOptionalArgOrDefault returns optional arg under the given argIdx.
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func (a *ArrayBytes) GetOptionalArgOrDefault(argIdx int, defaultValue int64) int64 {
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x := *a
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if argIdx < len(x) {
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return x[argIdx].N
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}
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if len(x) == 1 {
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return x[0].N
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}
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return defaultValue
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}
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