116 lines
3.8 KiB
Plaintext
116 lines
3.8 KiB
Plaintext
%{
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// Copyright 2017 The Prometheus Authors
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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 textparse
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import (
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"fmt"
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"math"
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"strconv"
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"github.com/prometheus/prometheus/pkg/value"
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)
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// Lex is called by the parser generated by "go tool yacc" to obtain each
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// token. The method is opened before the matching rules block and closed at
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// the end of the file.
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func (l *lexer) Lex() int {
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const (
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lstateInit = iota
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lstateValue
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lstateTimestamp
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lstateLabels
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lstateLName
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lstateLValue
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)
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s := lstateInit
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if l.i >= len(l.b) {
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return eof
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}
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c := l.b[l.i]
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l.ts = nil
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l.mstart = l.nextMstart
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l.offsets = l.offsets[:0]
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%}
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D [0-9]
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S [a-zA-Z]
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L [a-zA-Z_]
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M [a-zA-Z_:]
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%x lstateValue lstateTimestamp lstateLabels lstateLName lstateLValue
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%yyc c
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%yyn c = l.next()
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%yyt s
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%%
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\0 return eof
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#[^\r\n]*\n l.mstart = l.i
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[\r\n \t]+ l.mstart = l.i
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{S}({M}|{D})*\{ s = lstateLabels
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l.offsets = append(l.offsets, l.i-1)
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{S}({M}|{D})* s = lstateValue
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l.mend = l.i
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l.offsets = append(l.offsets, l.i)
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<lstateLabels>[ \t]+
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<lstateLabels>\} s = lstateValue
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l.mend = l.i
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<lstateLabels>,? s = lstateLName
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l.offsets = append(l.offsets, l.i)
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<lstateLName>{S}({L}|{D})*= s = lstateLValue
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l.offsets = append(l.offsets, l.i-1)
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<lstateLValue>\"(\\.|[^\\"])*\" s = lstateLabels
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l.offsets = append(l.offsets, l.i-1)
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<lstateLValue>\'(\\.|[^\\'])*\' s = lstateLabels
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l.offsets = append(l.offsets, l.i-1)
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<lstateValue>[ \t]+ l.vstart = l.i
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<lstateValue>(NaN) l.val = math.Float64frombits(value.NormalNaN)
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s = lstateTimestamp
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<lstateValue>[^\n \t\r]+ // We don't parse strictly correct floats as the conversion
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// repeats the effort anyway.
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l.val, l.err = strconv.ParseFloat(yoloString(l.b[l.vstart:l.i]), 64)
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if l.err != nil {
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return -1
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}
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s = lstateTimestamp
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<lstateTimestamp>[ \t]+ l.tstart = l.i
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<lstateTimestamp>{D}+ ts, err := strconv.ParseInt(yoloString(l.b[l.tstart:l.i]), 10, 64)
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if err != nil {
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l.err = err
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return -1
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}
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l.ts = &ts
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<lstateTimestamp>[\r\n]+ l.nextMstart = l.i
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return 1
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<lstateTimestamp>\0 return 1
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%%
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l.err = fmt.Errorf("no token found")
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return -1
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}
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