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package segments
import (
"fmt"
"strconv"
"strings"
)
type Slice struct {
startIdx int
endIdx int
}
func ParseSliceSegment(s string) (YamlPathSegment, error) {
idxs := strings.Split(s[1:len(s)-1], ":")
start, err := strconv.Atoi(idxs[0])
if err != nil {
return nil, fmt.Errorf("part '%s' is not an index into an array. %w", s, err)
}
end, err := strconv.Atoi(idxs[1])
if err != nil {
return nil, fmt.Errorf("part '%s' is not an index into an array. %w", s, err)
}
if start > end {
return nil, fmt.Errorf("cannot take slice with reversed indexes '%s'", s)
}
return &Slice{
startIdx: start,
endIdx: end,
}, nil
}
func (s *Slice) NavigateMap(m map[string]interface{}) (interface{}, error) {
return nil, fmt.Errorf("cannot slice map")
}
func (s *Slice) NavigateArray(l []interface{}) (interface{}, error) {
if s.startIdx >= len(l) {
return nil, fmt.Errorf("start slice index out of bounds '%d' for array length '%d'", s.startIdx, len(l))
}
if s.endIdx > len(l) {
return nil, fmt.Errorf("end slice index out of bounds '%d' for array length '%d'", s.endIdx, len(l))
}
slice := []interface{}{}
for i := s.startIdx; i < s.endIdx; i++ {
slice = append(slice, l[i])
}
return slice, nil
}
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