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50 lines
810 B
50 lines
810 B
package match
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import (
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"fmt"
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"strings"
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"unicode/utf8"
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)
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type Prefix struct {
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Prefix string
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}
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func NewPrefix(p string) Prefix {
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return Prefix{p}
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}
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func (self Prefix) Index(s string) (int, []int) {
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idx := strings.Index(s, self.Prefix)
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if idx == -1 {
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return -1, nil
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}
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length := len(self.Prefix)
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var sub string
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if len(s) > idx+length {
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sub = s[idx+length:]
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} else {
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sub = ""
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}
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segments := acquireSegments(len(sub) + 1)
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segments = append(segments, length)
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for i, r := range sub {
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segments = append(segments, length+i+utf8.RuneLen(r))
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}
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return idx, segments
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}
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func (self Prefix) Len() int {
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return lenNo
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}
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func (self Prefix) Match(s string) bool {
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return strings.HasPrefix(s, self.Prefix)
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}
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func (self Prefix) String() string {
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return fmt.Sprintf("<prefix:%s>", self.Prefix)
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}
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