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v2fly/common/strmatcher/strmatcher.go
Darien Raymond cb0eb91f2b
strmatcher
2018-06-26 21:57:41 +02:00

90 lines
1.3 KiB
Go

package strmatcher
import "regexp"
type Matcher interface {
Match(string) bool
}
type Type byte
const (
Full Type = iota
Substr
Domain
Regex
)
func (t Type) New(pattern string) (Matcher, error) {
switch t {
case Full:
return fullMatcher(pattern), nil
case Substr:
return substrMatcher(pattern), nil
case Domain:
return domainMatcher(pattern), nil
case Regex:
r, err := regexp.Compile(pattern)
if err != nil {
return nil, err
}
return &regexMatcher{
pattern: r,
}, nil
default:
panic("Unknown type")
}
}
type matcherEntry struct {
m Matcher
id uint32
}
type MatcherGroup struct {
count uint32
fullMatchers map[string]uint32
otherMatchers []matcherEntry
}
func NewMatcherGroup() *MatcherGroup {
return &MatcherGroup{
count: 1,
fullMatchers: make(map[string]uint32),
}
}
func (g *MatcherGroup) Add(m Matcher) uint32 {
c := g.count
g.count++
if fm, ok := m.(fullMatcher); ok {
g.fullMatchers[string(fm)] = c
} else {
g.otherMatchers = append(g.otherMatchers, matcherEntry{
m: m,
id: c,
})
}
return c
}
func (g *MatcherGroup) Match(pattern string) uint32 {
if c, f := g.fullMatchers[pattern]; f {
return c
}
for _, e := range g.otherMatchers {
if e.m.Match(pattern) {
return e.id
}
}
return 0
}
func (g *MatcherGroup) Size() uint32 {
return g.count
}