150 lines
2.0 KiB
Go
150 lines
2.0 KiB
Go
package logfmt
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import (
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"errors"
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"fmt"
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)
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var ErrUnterminatedString = errors.New("logfmt: unterminated string")
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func gotoScanner(data []byte, h Handler) (err error) {
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saveError := func(e error) {
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if err == nil {
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err = e
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}
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}
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var c byte
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var i int
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var m int
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var key []byte
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var val []byte
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var ok bool
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var esc bool
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garbage:
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if i == len(data) {
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return
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}
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c = data[i]
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switch {
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case c > ' ' && c != '"' && c != '=':
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key, val = nil, nil
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m = i
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i++
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goto key
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default:
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i++
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goto garbage
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}
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key:
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if i >= len(data) {
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if m >= 0 {
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key = data[m:i]
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saveError(h.HandleLogfmt(key, nil))
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}
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return
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}
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c = data[i]
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switch {
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case c > ' ' && c != '"' && c != '=':
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i++
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goto key
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case c == '=':
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key = data[m:i]
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i++
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goto equal
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default:
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key = data[m:i]
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i++
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saveError(h.HandleLogfmt(key, nil))
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goto garbage
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}
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equal:
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if i >= len(data) {
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if m >= 0 {
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i--
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key = data[m:i]
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saveError(h.HandleLogfmt(key, nil))
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}
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return
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}
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c = data[i]
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switch {
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case c > ' ' && c != '"' && c != '=':
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m = i
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i++
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goto ivalue
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case c == '"':
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m = i
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i++
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esc = false
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goto qvalue
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default:
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if key != nil {
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saveError(h.HandleLogfmt(key, val))
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}
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i++
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goto garbage
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}
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ivalue:
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if i >= len(data) {
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if m >= 0 {
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val = data[m:i]
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saveError(h.HandleLogfmt(key, val))
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}
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return
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}
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c = data[i]
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switch {
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case c > ' ' && c != '"' && c != '=':
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i++
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goto ivalue
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default:
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val = data[m:i]
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saveError(h.HandleLogfmt(key, val))
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i++
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goto garbage
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}
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qvalue:
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if i >= len(data) {
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if m >= 0 {
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saveError(ErrUnterminatedString)
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}
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return
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}
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c = data[i]
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switch c {
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case '\\':
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i += 2
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esc = true
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goto qvalue
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case '"':
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i++
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val = data[m:i]
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if esc {
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val, ok = unquoteBytes(val)
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if !ok {
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saveError(fmt.Errorf("logfmt: error unquoting bytes %q", string(val)))
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goto garbage
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}
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} else {
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val = val[1 : len(val)-1]
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}
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saveError(h.HandleLogfmt(key, val))
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goto garbage
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default:
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i++
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goto qvalue
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}
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}
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