correctly decode ()

Author: ying-jeanne

model/textparse/interface.go

@@ -51,8 +51,8 @@ type Parser interface {
 	// The returned byte slices become invalid after the next call to Next.
 	Unit() ([]byte, []byte)
 
-	// Identifiers returns the identifiers for info metrics
-	Identifiers() []string
+	// IdentifyingLabels returns the identifying labels for info metrics
+	IdentifyingLabels() []string
 
 	// Comment returns the text of the current comment.
 	// Must only be called after Next returned a comment entry.
@@ -113,5 +113,4 @@ const (
 	EntryComment   Entry = 3
 	EntryUnit      Entry = 4
 	EntryHistogram Entry = 5 // A series with a native histogram as a value.
-	EntryIdent     Entry = 6
 )

model/textparse/openmetricslex.l

@@ -33,10 +33,10 @@ func (l *openMetricsLexer) Lex() token {
 D     [0-9]
 L     [a-zA-Z_]
 M     [a-zA-Z_:]
-C     [^\n]
+C     [^\n()]
 S     [ ]
 
-%x sComment sMeta1 sMeta2 sLabels sLValue sValue sTimestamp sExemplar sEValue sETimestamp sMeta3
+%x sComment sMeta1 sMeta2 sLabels sLValue sValue sTimestamp sExemplar sEValue sETimestamp sIdens
 
 %yyc c
 %yyn c = l.next()
@@ -50,13 +50,14 @@ S     [ ]
 <sComment>TYPE{S}                     l.state = sMeta1; return tType
 <sComment>UNIT{S}                     l.state = sMeta1; return tUnit
 <sComment>"EOF"\n?                    l.state = sInit; return tEOFWord
-<sComment>ID{S}                       l.state = sMeta3; return tIdens
 <sMeta1>\"(\\.|[^\\"])*\"             l.state = sMeta2; return tMName
 <sMeta1>{M}({M}|{D})*                 l.state = sMeta2; return tMName
-<sMeta2>{S}{C}*\n                     l.state = sInit; return tText
-<sMeta3>{L}*                          return tLName
-<sMeta3>,                             return tComma
-<sMeta3>\n                            l.state = sInit; return tLinebreak
+<sMeta2>{S}{C}*                       l.state = sMeta2; return tText
+<sMeta2>\(                            l.state = sIdens; return tParentOpen
+<sIdens>{L}({L}|{D})*                 return tLName
+<sIdens>,                             return tComma
+<sIdens>\)                            l.state = sMeta2; return tParentClose
+<sMeta2>\n                            l.state = sInit; return tLinebreak           
 
 {M}({M}|{D})*                         l.state = sValue; return tMName
 <sValue>\{                            l.state = sLabels; return tBraceOpen