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v2fly/common/strmatcher/strmatcher.go

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package strmatcher
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import (
"regexp"
)
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// Matcher is the interface to determine a string matches a pattern.
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type Matcher interface {
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// Match returns true if the given string matches a predefined pattern.
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Match(string) bool
String() string
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}
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// Type is the type of the matcher.
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type Type byte
const (
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// Full is the type of matcher that the input string must exactly equal to the pattern.
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Full Type = iota
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// Substr is the type of matcher that the input string must contain the pattern as a sub-string.
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Substr
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// Domain is the type of matcher that the input string must be a sub-domain or itself of the pattern.
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Domain
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// Regex is the type of matcher that the input string must matches the regular-expression pattern.
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Regex
)
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// New creates a new Matcher based on the given pattern.
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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")
}
}
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// IndexMatcher is the interface for matching with a group of matchers.
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type IndexMatcher interface {
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// Match returns the the index of a matcher that matches the input. It returns 0 if no such matcher exists.
Match(input string) []uint32
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}
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type matcherEntry struct {
m Matcher
id uint32
}
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// MatcherGroup is an implementation of IndexMatcher.
// Empty initialization works.
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type MatcherGroup struct {
count uint32
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fullMatcher FullMatcherGroup
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domainMatcher DomainMatcherGroup
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otherMatchers []matcherEntry
}
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// Add adds a new Matcher into the MatcherGroup, and returns its index. The index will never be 0.
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func (g *MatcherGroup) Add(m Matcher) uint32 {
g.count++
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c := g.count
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switch tm := m.(type) {
case fullMatcher:
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g.fullMatcher.addMatcher(tm, c)
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case domainMatcher:
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g.domainMatcher.addMatcher(tm, c)
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default:
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g.otherMatchers = append(g.otherMatchers, matcherEntry{
m: m,
id: c,
})
}
return c
}
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// Match implements IndexMatcher.Match.
func (g *MatcherGroup) Match(pattern string) []uint32 {
result := []uint32{}
result = append(result, g.fullMatcher.Match(pattern)...)
result = append(result, g.domainMatcher.Match(pattern)...)
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for _, e := range g.otherMatchers {
if e.m.Match(pattern) {
result = append(result, e.id)
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}
}
return result
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}
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// Size returns the number of matchers in the MatcherGroup.
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func (g *MatcherGroup) Size() uint32 {
return g.count
}