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-rw-r--r--opts.go57
1 files changed, 27 insertions, 30 deletions
diff --git a/opts.go b/opts.go
index 4fe07a5..7f5882c 100644
--- a/opts.go
+++ b/opts.go
@@ -12,6 +12,8 @@
// user-facing I/O is delegrated to the caller.
package opts
+import "slices"
+
// ArgMode represents the whether or not a long-option takes an argument.
type ArgMode int
@@ -62,44 +64,30 @@ type LongOpt struct {
// of the first non-option argument in optind. In the case of failure,
// err will be one of [BadOptionError] or [NoArgumentError].
func Get(args []string, optstr string) (flags []Flag, optind int, err error) {
- argmap := make(map[rune]ArgMode)
-
- rs := []rune(optstr)
- if rs[0] == ':' {
- rs = rs[1:]
- }
- for len(rs) > 0 {
- switch r := rs[0]; {
- case len(rs) > 2 && rs[1] == ':' && rs[2] == ':':
- argmap[r] = Optional
- rs = rs[3:]
- case len(rs) > 1 && rs[1] == ':':
- argmap[r] = Required
- rs = rs[2:]
- default:
- argmap[r] = None
- rs = rs[1:]
- }
+ if len(args) == 0 {
+ return
}
- for i := 1; i < len(args); i++ {
+ optrs := []rune(optstr)
+ var i int
+ for i = 1; i < len(args); i++ {
arg := args[i]
if len(arg) == 0 || arg == "-" || arg[0] != '-' {
- optind = i
- return
+ break
} else if arg == "--" {
- optind = i + 1
- return
+ i++
+ break
}
rs := []rune(arg[1:])
for j, r := range rs {
- var s string
- am, ok := argmap[r]
-
- switch {
- case !ok:
+ k := slices.Index(optrs, r)
+ if k == -1 {
return nil, 0, BadOptionError(r)
+ }
+
+ var s string
+ switch am := colonsToArgMode(optrs[k+1:]); {
case am != None && j < len(rs)-1:
s = string(rs[j+1:])
case am == Required:
@@ -118,6 +106,15 @@ func Get(args []string, optstr string) (flags []Flag, optind int, err error) {
}
}
- optind = len(args)
- return
+ return flags, i, nil
+}
+
+func colonsToArgMode(rs []rune) ArgMode {
+ if len(rs) >= 2 && rs[0] == ':' && rs[1] == ':' {
+ return Optional
+ }
+ if len(rs) >= 1 && rs[0] == ':' {
+ return Required
+ }
+ return None
}