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parse_ref.go
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parse_ref.go
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package ref
import (
"fmt"
"regexp"
"strconv"
"github.com/treeverse/lakefs/pkg/graveler"
)
var modifiersRegexp = regexp.MustCompile("(^|[~^@$])[^^~@$]*")
func parseRefModifier(buf string) (graveler.RefModifier, error) {
amount := 1
var err error
var typ graveler.RefModType
switch buf[0] {
case '~':
typ = graveler.RefModTypeTilde
case '^':
typ = graveler.RefModTypeCaret
case '$':
typ = graveler.RefModTypeDollar
if len(buf) > 1 {
return graveler.RefModifier{}, graveler.ErrInvalidRef
}
case '@':
typ = graveler.RefModTypeAt
if len(buf) > 1 {
return graveler.RefModifier{}, graveler.ErrInvalidRef
}
default:
return graveler.RefModifier{}, graveler.ErrInvalidRef
}
if len(buf) > 1 {
amount, err = strconv.Atoi(buf[1:])
if err != nil {
return graveler.RefModifier{}, fmt.Errorf("could not parse modifier %s: %w", buf, graveler.ErrInvalidRef)
}
}
return graveler.RefModifier{
Type: typ,
Value: amount,
}, nil
}
func ParseRef(r graveler.Ref) (graveler.RawRef, error) {
ref := string(r)
parts := modifiersRegexp.FindAllString(ref, -1)
if len(parts) == 0 || len(parts[0]) == 0 {
return graveler.RawRef{}, graveler.ErrInvalidRef
}
baseRef := parts[0]
mods := make([]graveler.RefModifier, 0, len(parts)-1)
for _, part := range parts[1:] {
mod, err := parseRefModifier(part)
if err != nil {
return graveler.RawRef{}, err
}
mods = append(mods, mod)
}
return graveler.RawRef{
BaseRef: baseRef,
Modifiers: mods,
}, nil
}