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108 lines
2.6 KiB
Go
108 lines
2.6 KiB
Go
package strmatcher
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import (
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"regexp"
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)
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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
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String() string
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}
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// Type is the type of the matcher.
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type Type byte
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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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)
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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) {
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// 1. regex matching is case-sensitive
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switch t {
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case Full:
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return fullMatcher(pattern), nil
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case Substr:
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return substrMatcher(pattern), nil
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case Domain:
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return domainMatcher(pattern), nil
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case Regex:
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r, err := regexp.Compile(pattern)
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if err != nil {
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return nil, err
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}
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return ®exMatcher{
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pattern: r,
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}, nil
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default:
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panic("Unknown type")
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}
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}
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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 index of a matcher that matches the input. It returns empty array if no such matcher exists.
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Match(input string) []uint32
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}
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type matcherEntry struct {
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m Matcher
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id uint32
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}
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// MatcherGroup is an implementation of IndexMatcher.
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// Empty initialization works.
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type MatcherGroup struct {
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count uint32
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fullMatcher FullMatcherGroup
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domainMatcher DomainMatcherGroup
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otherMatchers []matcherEntry
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}
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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 {
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g.count++
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c := g.count
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switch tm := m.(type) {
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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{
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m: m,
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id: c,
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})
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}
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return c
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}
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// Match implements IndexMatcher.Match.
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func (g *MatcherGroup) Match(pattern string) []uint32 {
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result := []uint32{}
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result = append(result, g.fullMatcher.Match(pattern)...)
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result = append(result, g.domainMatcher.Match(pattern)...)
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for _, e := range g.otherMatchers {
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if e.m.Match(pattern) {
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result = append(result, e.id)
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}
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}
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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 {
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return g.count
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}
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