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matcher.go
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matcher.go
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// Copyright The HTNN Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expr
import (
"errors"
"regexp"
"strings"
api "mosn.io/htnn/types/plugins/api/v1"
)
type Matcher interface {
Match(s string) bool
IgnoreCase() bool
}
type stringPrefixMatcher struct {
target string
ignoreCase bool
}
func (m *stringPrefixMatcher) Match(s string) bool {
return strings.HasPrefix(s, m.target)
}
func (m *stringPrefixMatcher) IgnoreCase() bool {
return m.ignoreCase
}
type stringSuffixMatcher struct {
target string
ignoreCase bool
}
func (m *stringSuffixMatcher) Match(s string) bool {
return strings.HasSuffix(s, m.target)
}
func (m *stringSuffixMatcher) IgnoreCase() bool {
return m.ignoreCase
}
type stringRegexMatcher struct {
regex *regexp.Regexp
}
func (m *stringRegexMatcher) Match(s string) bool {
return m.regex.MatchString(s)
}
func (m *stringRegexMatcher) IgnoreCase() bool {
return false
}
type stringContainsMatcher struct {
target string
ignoreCase bool
}
func (m *stringContainsMatcher) Match(s string) bool {
return strings.Contains(s, m.target)
}
func (m *stringContainsMatcher) IgnoreCase() bool {
return m.ignoreCase
}
type stringExactMatcher struct {
target string
ignoreCase bool
}
func (m *stringExactMatcher) Match(s string) bool {
return s == m.target
}
func (m *stringExactMatcher) IgnoreCase() bool {
return m.ignoreCase
}
type repeatedStringMatcher struct {
needIgnoreCase bool
matchers []Matcher
}
func (rsm *repeatedStringMatcher) Match(s string) bool {
var ls string
if rsm.needIgnoreCase {
// the repeated string matcher will share one case-insensitive input
ls = strings.ToLower(s)
}
for _, m := range rsm.matchers {
input := s
if m.IgnoreCase() {
input = ls
}
if m.Match(input) {
return true
}
}
return false
}
func (rsm *repeatedStringMatcher) IgnoreCase() bool {
return rsm.needIgnoreCase
}
func buildRepeatedStringMatcher(matchers []*api.StringMatcher, allIgnoreCase bool) (Matcher, error) {
builtMatchers := make([]Matcher, len(matchers))
needIgnoreCase := allIgnoreCase
// For small input (len(matchers) <= 8), match one by one is faster than creating a match
// table. Current user case doesn't need to handle big input yet.
for i, m := range matchers {
ignoreCase := allIgnoreCase
if m.IgnoreCase {
ignoreCase = true
}
var matcher Matcher
switch v := m.MatchPattern.(type) {
case *api.StringMatcher_Exact:
target := v.Exact
if ignoreCase {
target = strings.ToLower(target)
}
matcher = &stringExactMatcher{target: target, ignoreCase: ignoreCase}
case *api.StringMatcher_Prefix:
target := v.Prefix
if ignoreCase {
target = strings.ToLower(target)
}
matcher = &stringPrefixMatcher{target: target, ignoreCase: ignoreCase}
case *api.StringMatcher_Suffix:
target := v.Suffix
if ignoreCase {
target = strings.ToLower(target)
}
matcher = &stringSuffixMatcher{target: target, ignoreCase: ignoreCase}
case *api.StringMatcher_Contains:
target := v.Contains
if ignoreCase {
target = strings.ToLower(target)
}
matcher = &stringContainsMatcher{target: target, ignoreCase: ignoreCase}
case *api.StringMatcher_Regex:
target := v.Regex
if ignoreCase && !strings.HasPrefix(target, "(?i)") {
target = "(?i)" + target
}
re, err := regexp.Compile(target)
if err != nil {
return nil, err
}
matcher = &stringRegexMatcher{regex: re}
default:
return nil, errors.New("unknown string matcher type")
}
builtMatchers[i] = matcher
if ignoreCase {
needIgnoreCase = true
}
}
return &repeatedStringMatcher{
matchers: builtMatchers,
needIgnoreCase: needIgnoreCase,
}, nil
}
func BuildRepeatedStringMatcherIgnoreCase(matchers []*api.StringMatcher) (Matcher, error) {
return buildRepeatedStringMatcher(matchers, true)
}
func BuildRepeatedStringMatcher(matchers []*api.StringMatcher) (Matcher, error) {
return buildRepeatedStringMatcher(matchers, false)
}
func BuildStringMatcher(m *api.StringMatcher) (Matcher, error) {
return BuildRepeatedStringMatcher([]*api.StringMatcher{m})
}