mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2024-12-14 18:31:49 +03:00
217 lines
4.9 KiB
Go
217 lines
4.9 KiB
Go
|
package substring
|
||
|
|
||
|
import (
|
||
|
"regexp"
|
||
|
"strings"
|
||
|
|
||
|
"github.com/toqueteos/trie"
|
||
|
)
|
||
|
|
||
|
type StringsMatcher interface {
|
||
|
Match(s string) bool
|
||
|
MatchIndex(s string) int
|
||
|
}
|
||
|
|
||
|
// regexp
|
||
|
type regexpString struct{ re *regexp.Regexp }
|
||
|
|
||
|
func Regexp(pat string) *regexpString { return ®expString{regexp.MustCompile(pat)} }
|
||
|
func (m *regexpString) Match(s string) bool { return m.re.MatchString(s) }
|
||
|
func (m *regexpString) MatchIndex(s string) int {
|
||
|
found := m.re.FindStringIndex(s)
|
||
|
if found != nil {
|
||
|
return found[1]
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// exact
|
||
|
type exactString struct{ pat string }
|
||
|
|
||
|
func Exact(pat string) *exactString { return &exactString{pat} }
|
||
|
func (m *exactString) Match(s string) bool { return m.pat == s }
|
||
|
func (m *exactString) MatchIndex(s string) int {
|
||
|
if m.pat == s {
|
||
|
return len(s)
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// any, search `s` in `.Match(pat)`
|
||
|
type anyString struct{ pat string }
|
||
|
|
||
|
func Any(pat string) *anyString { return &anyString{pat} }
|
||
|
func (m *anyString) Match(s string) bool {
|
||
|
return strings.Index(m.pat, s) >= 0
|
||
|
}
|
||
|
func (m *anyString) MatchIndex(s string) int {
|
||
|
if idx := strings.Index(m.pat, s); idx >= 0 {
|
||
|
return idx + len(s)
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// has, search `pat` in `.Match(s)`
|
||
|
type hasString struct{ pat string }
|
||
|
|
||
|
func Has(pat string) *hasString { return &hasString{pat} }
|
||
|
func (m *hasString) Match(s string) bool {
|
||
|
return strings.Index(s, m.pat) >= 0
|
||
|
}
|
||
|
func (m *hasString) MatchIndex(s string) int {
|
||
|
if idx := strings.Index(s, m.pat); idx >= 0 {
|
||
|
return idx + len(m.pat)
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// prefix
|
||
|
type prefixString struct{ pat string }
|
||
|
|
||
|
func Prefix(pat string) *prefixString { return &prefixString{pat} }
|
||
|
func (m *prefixString) Match(s string) bool { return strings.HasPrefix(s, m.pat) }
|
||
|
func (m *prefixString) MatchIndex(s string) int {
|
||
|
if strings.HasPrefix(s, m.pat) {
|
||
|
return len(m.pat)
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// prefixes
|
||
|
type prefixesString struct{ t *trie.Trie }
|
||
|
|
||
|
func Prefixes(pats ...string) *prefixesString {
|
||
|
t := trie.New()
|
||
|
for _, pat := range pats {
|
||
|
t.Insert([]byte(pat))
|
||
|
}
|
||
|
return &prefixesString{t}
|
||
|
}
|
||
|
func (m *prefixesString) Match(s string) bool { return m.t.PrefixIndex([]byte(s)) >= 0 }
|
||
|
func (m *prefixesString) MatchIndex(s string) int {
|
||
|
if idx := m.t.PrefixIndex([]byte(s)); idx >= 0 {
|
||
|
return idx
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// suffix
|
||
|
type suffixString struct{ pat string }
|
||
|
|
||
|
func Suffix(pat string) *suffixString { return &suffixString{pat} }
|
||
|
func (m *suffixString) Match(s string) bool { return strings.HasSuffix(s, m.pat) }
|
||
|
func (m *suffixString) MatchIndex(s string) int {
|
||
|
if strings.HasSuffix(s, m.pat) {
|
||
|
return len(m.pat)
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// suffixes
|
||
|
type suffixesString struct{ t *trie.Trie }
|
||
|
|
||
|
func Suffixes(pats ...string) *suffixesString {
|
||
|
t := trie.New()
|
||
|
for _, pat := range pats {
|
||
|
t.Insert(reverse([]byte(pat)))
|
||
|
}
|
||
|
return &suffixesString{t}
|
||
|
}
|
||
|
func (m *suffixesString) Match(s string) bool {
|
||
|
return m.t.PrefixIndex(reverse([]byte(s))) >= 0
|
||
|
}
|
||
|
func (m *suffixesString) MatchIndex(s string) int {
|
||
|
if idx := m.t.PrefixIndex(reverse([]byte(s))); idx >= 0 {
|
||
|
return idx
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// after
|
||
|
type afterString struct {
|
||
|
first string
|
||
|
matcher StringsMatcher
|
||
|
}
|
||
|
|
||
|
func After(first string, m StringsMatcher) *afterString {
|
||
|
return &afterString{first, m}
|
||
|
}
|
||
|
func (a *afterString) Match(s string) bool {
|
||
|
if idx := strings.Index(s, a.first); idx >= 0 {
|
||
|
return a.matcher.Match(s[idx+len(a.first):])
|
||
|
}
|
||
|
return false
|
||
|
}
|
||
|
func (a *afterString) MatchIndex(s string) int {
|
||
|
if idx := strings.Index(s, a.first); idx >= 0 {
|
||
|
return idx + a.matcher.MatchIndex(s[idx+len(a.first):])
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
// and, returns true iff all matchers return true
|
||
|
type andString struct{ matchers []StringsMatcher }
|
||
|
|
||
|
func And(m ...StringsMatcher) *andString { return &andString{m} }
|
||
|
func (a *andString) Match(s string) bool {
|
||
|
for _, m := range a.matchers {
|
||
|
if !m.Match(s) {
|
||
|
return false
|
||
|
}
|
||
|
}
|
||
|
return true
|
||
|
}
|
||
|
func (a *andString) MatchIndex(s string) int {
|
||
|
longest := 0
|
||
|
for _, m := range a.matchers {
|
||
|
if idx := m.MatchIndex(s); idx < 0 {
|
||
|
return -1
|
||
|
} else if idx > longest {
|
||
|
longest = idx
|
||
|
}
|
||
|
}
|
||
|
return longest
|
||
|
}
|
||
|
|
||
|
// or, returns true iff any matcher returns true
|
||
|
type orString struct{ matchers []StringsMatcher }
|
||
|
|
||
|
func Or(m ...StringsMatcher) *orString { return &orString{m} }
|
||
|
func (o *orString) Match(s string) bool {
|
||
|
for _, m := range o.matchers {
|
||
|
if m.Match(s) {
|
||
|
return true
|
||
|
}
|
||
|
}
|
||
|
return false
|
||
|
}
|
||
|
func (o *orString) MatchIndex(s string) int {
|
||
|
for _, m := range o.matchers {
|
||
|
if idx := m.MatchIndex(s); idx >= 0 {
|
||
|
return idx
|
||
|
}
|
||
|
}
|
||
|
return -1
|
||
|
}
|
||
|
|
||
|
type suffixGroupString struct {
|
||
|
suffix StringsMatcher
|
||
|
matchers []StringsMatcher
|
||
|
}
|
||
|
|
||
|
func SuffixGroup(s string, m ...StringsMatcher) *suffixGroupString {
|
||
|
return &suffixGroupString{Suffix(s), m}
|
||
|
}
|
||
|
func (sg *suffixGroupString) Match(s string) bool {
|
||
|
if sg.suffix.Match(s) {
|
||
|
return Or(sg.matchers...).Match(s)
|
||
|
}
|
||
|
return false
|
||
|
}
|
||
|
func (sg *suffixGroupString) MatchIndex(s string) int {
|
||
|
if sg.suffix.MatchIndex(s) >= 0 {
|
||
|
return Or(sg.matchers...).MatchIndex(s)
|
||
|
}
|
||
|
return -1
|
||
|
}
|