1 %{
2 // Copyright 2018 The Prometheus Authors
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 package textparse
16 
17 import (
18     "fmt"
19 )
20 
21 // Lex is called by the parser generated by "go tool yacc" to obtain each
22 // token. The method is opened before the matching rules block and closed at
23 // the end of the file.
func(l * openMetricsLexer)24 func (l *openMetricsLexer) Lex() token {
25     if l.i >= len(l.b) {
26         return tEOF
27     }
28     c := l.b[l.i]
29     l.start = l.i
30 
31 %}
32 
33 D     [0-9]
34 L     [a-zA-Z_]
35 M     [a-zA-Z_:]
36 C     [^\n]
37 S     [ ]
38 
39 %x sComment sMeta1 sMeta2 sLabels sLValue sValue sTimestamp sExemplar sEValue sETimestamp
40 
41 %yyc c
42 %yyn c = l.next()
43 %yyt l.state
44 
45 
46 %%
47 
48 #{S}                                  l.state = sComment
49 <sComment>HELP{S}                     l.state = sMeta1; return tHelp
50 <sComment>TYPE{S}                     l.state = sMeta1; return tType
51 <sComment>UNIT{S}                     l.state = sMeta1; return tUnit
52 <sComment>"EOF"\n?                    l.state = sInit; return tEOFWord
53 <sMeta1>{M}({M}|{D})*                 l.state = sMeta2; return tMName
54 <sMeta2>{S}{C}*\n                     l.state = sInit; return tText
55 
56 {M}({M}|{D})*                         l.state = sValue; return tMName
57 <sValue>\{                            l.state = sLabels; return tBraceOpen
58 <sLabels>{L}({L}|{D})*                return tLName
59 <sLabels>\}                           l.state = sValue; return tBraceClose
60 <sLabels>=                            l.state = sLValue; return tEqual
61 <sLabels>,                            return tComma
62 <sLValue>\"(\\.|[^\\"\n])*\"          l.state = sLabels; return tLValue
63 <sValue>{S}[^ \n]+                    l.state = sTimestamp; return tValue
64 <sTimestamp>{S}[^ \n]+                return tTimestamp
65 <sTimestamp>\n                        l.state = sInit; return tLinebreak
66 <sTimestamp>{S}#{S}\{                 l.state = sExemplar; return tComment
67 
68 <sExemplar>{L}({L}|{D})*              return tLName
69 <sExemplar>\}                         l.state = sEValue; return tBraceClose
70 <sExemplar>=                          l.state = sEValue; return tEqual
71 <sEValue>\"(\\.|[^\\"\n])*\"          l.state = sExemplar; return tLValue
72 <sExemplar>,                          return tComma
73 <sEValue>{S}[^ \n]+                   l.state = sETimestamp; return tValue
74 <sETimestamp>{S}[^ \n]+               return tTimestamp
75 <sETimestamp>\n                       l.state = sInit; return tLinebreak
76 
77 %%
78 
79     return tInvalid
80 }
81