94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
// Copyright 2018 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package labels
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import (
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"fmt"
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"regexp"
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"strings"
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)
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var (
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re = regexp.MustCompile(`(?:\s?)(\w+)(=|=~|!=|!~)(?:\"([^"=~!]+)\"|([^"=~!]+)|\"\")`)
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typeMap = map[string]MatchType{
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"=": MatchEqual,
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"!=": MatchNotEqual,
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"=~": MatchRegexp,
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"!~": MatchNotRegexp,
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}
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)
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func ParseMatchers(s string) ([]*Matcher, error) {
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matchers := []*Matcher{}
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s = strings.TrimPrefix(s, "{")
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s = strings.TrimSuffix(s, "}")
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var insideQuotes bool
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var token string
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var tokens []string
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for _, r := range s {
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if !insideQuotes && r == ',' {
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tokens = append(tokens, token)
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token = ""
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continue
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}
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token += string(r)
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if r == '"' {
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insideQuotes = !insideQuotes
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}
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}
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if token != "" {
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tokens = append(tokens, token)
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}
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for _, token := range tokens {
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m, err := ParseMatcher(token)
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if err != nil {
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return nil, err
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}
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matchers = append(matchers, m)
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}
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return matchers, nil
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}
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func ParseMatcher(s string) (*Matcher, error) {
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var (
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name, value string
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matchType MatchType
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)
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ms := re.FindStringSubmatch(s)
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if len(ms) < 4 {
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return nil, fmt.Errorf("bad matcher format: %s", s)
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}
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name = ms[1]
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if name == "" {
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return nil, fmt.Errorf("failed to parse label name")
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}
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matchType, found := typeMap[ms[2]]
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if !found {
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return nil, fmt.Errorf("failed to find match operator")
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}
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if ms[3] != "" {
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value = ms[3]
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} else {
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value = ms[4]
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}
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return NewMatcher(matchType, name, value)
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}
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