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// Copyright 2018 Prometheus Team
// 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 parse
import (
"fmt"
"regexp"
"strings"
"github.com/prometheus/prometheus/pkg/labels"
)
var (
re = regexp.MustCompile(`(?:\s?)(\w+)(=|=~|!=|!~)(?:\"([^"=~!]+)\"|([^"=~!]+)|\"\")`)
typeMap = map[string]labels.MatchType{
"=": labels.MatchEqual,
"!=": labels.MatchNotEqual,
"=~": labels.MatchRegexp,
"!~": labels.MatchNotRegexp,
}
)
func Matchers(s string) ([]*labels.Matcher, error) {
matchers := []*labels.Matcher{}
if strings.HasPrefix(s, "{") {
s = s[1:]
}
if strings.HasSuffix(s, "}") {
s = s[:len(s)-1]
}
var insideQuotes bool
var token string
var tokens []string
for _, r := range s {
if !insideQuotes && r == ',' {
tokens = append(tokens, token)
token = ""
continue
}
token += string(r)
if r == '"' {
insideQuotes = !insideQuotes
}
}
if token != "" {
tokens = append(tokens, token)
}
for _, token := range tokens {
m, err := Matcher(token)
if err != nil {
return nil, err
}
matchers = append(matchers, m)
}
return matchers, nil
}
func Matcher(s string) (*labels.Matcher, error) {
name, value, matchType, err := Input(s)
if err != nil {
return nil, err
}
m, err := labels.NewMatcher(matchType, name, value)
if err != nil {
return nil, err
}
return m, nil
}
func Input(s string) (name, value string, matchType labels.MatchType, err error) {
ms := re.FindStringSubmatch(s)
if len(ms) < 4 {
return "", "", labels.MatchEqual, fmt.Errorf("bad matcher format: %s", s)
}
var prs bool
name = ms[1]
matchType, prs = typeMap[ms[2]]
if ms[3] != "" {
value = ms[3]
} else {
value = ms[4]
}
if name == "" || !prs {
return "", "", labels.MatchEqual, fmt.Errorf("failed to parse")
}
return name, value, matchType, nil
}
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