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regexp.go
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regexp.go
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// Copyright 2020 Google LLC
//
// 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
//
// https://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 regexp contains functionality for unmarshalling regular expressions from a config.
package regexp
import (
"encoding/json"
"regexp"
)
// Regexp delegates to a Regexp while enabling unmarshalling.
// Any unspecified / nil matcher will return vacuous truth in MatchString
type Regexp struct {
r *regexp.Regexp
}
func New(s string) (*Regexp, error) {
r, err := regexp.Compile(s)
return &Regexp{r: r}, err
}
// MatchString delegates matching to the regex package.
func (mr *Regexp) MatchString(s string) bool {
return mr.r == nil || mr.r.MatchString(s)
}
// UnmarshalJSON implementation of json.UnmarshalJSON interface.
func (mr *Regexp) UnmarshalJSON(data []byte) error {
var matcher string
if err := json.Unmarshal(data, &matcher); err != nil {
return err
}
var err error
if mr.r, err = regexp.Compile(matcher); err != nil {
return err
}
return nil
}