77 lines
1.7 KiB
Plaintext
77 lines
1.7 KiB
Plaintext
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%{
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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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)
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//type lstate int
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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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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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%}
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D [0-9]
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L [a-zA-Z_]
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M [a-zA-Z_:]
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%x lstateValue 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 0
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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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{L}({L}|{D})*\{ s = lstateLName
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{L}({L}|{D})* s = lstateValue
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l.mend = 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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<lstateLName>{M}({M}|{D})*= s = lstateLValue
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<lstateLValue>\"(\\.|[^\\"])*\" s = lstateLabels
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<lstateLValue>\'(\\.|[^\\'])*\' s = lstateLabels
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<lstateValue>[ \t]+ l.vstart = l.i
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<lstateValue>(NaN) l.val = math.NaN()
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return 1
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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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return 1
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%%
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return -1
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}
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