mirror of https://github.com/gobwas/glob.git
118 lines
1.8 KiB
Go
118 lines
1.8 KiB
Go
package match
|
|
|
|
import (
|
|
"fmt"
|
|
"unicode/utf8"
|
|
)
|
|
|
|
type BTree struct {
|
|
Value, Left, Right Matcher
|
|
}
|
|
|
|
func (self BTree) Kind() Kind {
|
|
return KindBTree
|
|
}
|
|
|
|
func (self BTree) len() (l, v, r int, ok bool) {
|
|
v = self.Value.Len()
|
|
|
|
if self.Left != nil {
|
|
l = self.Left.Len()
|
|
}
|
|
|
|
if self.Right != nil {
|
|
r = self.Right.Len()
|
|
}
|
|
|
|
ok = l > -1 && v > -1 && r > -1
|
|
|
|
return
|
|
}
|
|
|
|
func (self BTree) Len() int {
|
|
l, v, r, ok := self.len()
|
|
if ok {
|
|
return l + v + r
|
|
}
|
|
|
|
return -1
|
|
}
|
|
|
|
// todo
|
|
func (self BTree) Index(s string) (int, []int) {
|
|
return -1, nil
|
|
}
|
|
|
|
func (self BTree) Match(s string) bool {
|
|
inputLen := len(s)
|
|
|
|
lLen, vLen, rLen, ok := self.len()
|
|
if ok && lLen+vLen+rLen > inputLen {
|
|
return false
|
|
}
|
|
|
|
var offset, limit int
|
|
if lLen >= 0 {
|
|
offset = lLen
|
|
}
|
|
if rLen >= 0 {
|
|
limit = inputLen - rLen
|
|
} else {
|
|
limit = inputLen
|
|
}
|
|
|
|
for offset < limit {
|
|
index, segments := self.Value.Index(s[offset:limit])
|
|
if index == -1 {
|
|
return false
|
|
}
|
|
|
|
l := string(s[:offset+index])
|
|
var left bool
|
|
if self.Left != nil {
|
|
left = self.Left.Match(l)
|
|
} else {
|
|
left = l == ""
|
|
}
|
|
|
|
if left {
|
|
for i := len(segments) - 1; i >= 0; i-- {
|
|
length := segments[i]
|
|
|
|
if rLen >= 0 && inputLen-(offset+index+length) != rLen {
|
|
continue
|
|
}
|
|
|
|
var right bool
|
|
|
|
var r string
|
|
// if there is no string for the right branch
|
|
if inputLen <= offset+index+length {
|
|
r = ""
|
|
} else {
|
|
r = s[offset+index+length:]
|
|
}
|
|
|
|
if self.Right != nil {
|
|
right = self.Right.Match(r)
|
|
} else {
|
|
right = r == ""
|
|
}
|
|
|
|
if right {
|
|
return true
|
|
}
|
|
}
|
|
}
|
|
|
|
_, step := utf8.DecodeRuneInString(s[offset+index:])
|
|
offset += index + step
|
|
}
|
|
|
|
return false
|
|
}
|
|
|
|
func (self BTree) String() string {
|
|
return fmt.Sprintf("[btree:%s<-%s->%s]", self.Left, self.Value, self.Right)
|
|
}
|