108 lines
2 KiB
Go
108 lines
2 KiB
Go
package flag
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import (
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"fmt"
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"reflect"
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"strings"
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)
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// Parse parses the command-line flag arguments into a map,
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// using the type information in element to discriminate whether a flag is supposed to be a bool,
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// and other such ambiguities.
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func Parse(args []string, element interface{}) (map[string]string, error) {
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f := flagSet{
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flagTypes: getFlagTypes(element),
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args: args,
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values: make(map[string]string),
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}
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for {
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seen, err := f.parseOne()
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if seen {
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continue
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}
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if err == nil {
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break
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}
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return nil, err
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}
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return f.values, nil
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}
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type flagSet struct {
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flagTypes map[string]reflect.Kind
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args []string
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values map[string]string
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}
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func (f *flagSet) parseOne() (bool, error) {
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if len(f.args) == 0 {
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return false, nil
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}
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s := f.args[0]
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if len(s) < 2 || s[0] != '-' {
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return false, nil
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}
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numMinuses := 1
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if s[1] == '-' {
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numMinuses++
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if len(s) == 2 { // "--" terminates the flags
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f.args = f.args[1:]
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return false, nil
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}
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}
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name := s[numMinuses:]
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if len(name) == 0 || name[0] == '-' || name[0] == '=' {
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return false, fmt.Errorf("bad flag syntax: %s", s)
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}
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// it's a flag. does it have an argument?
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f.args = f.args[1:]
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hasValue := false
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value := ""
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for i := 1; i < len(name); i++ { // equals cannot be first
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if name[i] == '=' {
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value = name[i+1:]
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hasValue = true
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name = name[0:i]
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break
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}
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}
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if hasValue {
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f.setValue(name, value)
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return true, nil
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}
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if f.flagTypes[name] == reflect.Bool || f.flagTypes[name] == reflect.Ptr {
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f.setValue(name, "true")
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return true, nil
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}
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if len(f.args) > 0 {
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// value is the next arg
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hasValue = true
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value, f.args = f.args[0], f.args[1:]
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}
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if !hasValue {
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return false, fmt.Errorf("flag needs an argument: -%s", name)
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}
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f.setValue(name, value)
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return true, nil
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}
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func (f *flagSet) setValue(name string, value string) {
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n := strings.ToLower("traefik." + name)
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v, ok := f.values[n]
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if ok && f.flagTypes[name] == reflect.Slice {
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f.values[n] = v + "," + value
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return
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}
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f.values[n] = value
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}
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