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parse.go
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parse.go
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package indexer
import (
"errors"
"regexp"
"github.com/rs/zerolog"
)
type Logger interface {
Debug() *zerolog.Event
}
func regExMatch(pattern string, value string) ([]string, error) {
rxp, err := regexp.Compile(pattern)
if err != nil {
return nil, err
}
matches := rxp.FindStringSubmatch(value)
if matches == nil {
return nil, nil
}
return matches[1:], nil
}
func ParseLine(logger Logger, pattern string, vars []string, tmpVars map[string]string, line string, ignore bool) (bool, error) {
if len(vars) > 0 {
return parseExtract(logger, pattern, vars, tmpVars, line)
}
return parseMatchRegexp(pattern, tmpVars, line, ignore)
}
func parseExtract(logger Logger, pattern string, vars []string, tmpVars map[string]string, line string) (bool, error) {
rxp, err := regExMatch(pattern, line)
if err != nil {
logger.Debug().Msgf("did not match expected line: %v", line)
}
if rxp == nil {
return false, nil
}
for i, v := range vars {
if i+1 > len(rxp) {
return false, errors.New("too few matches returned for rxp")
}
tmpVars[v] = rxp[i]
}
return true, nil
}
func parseMatchRegexp(pattern string, tmpVars map[string]string, line string, ignore bool) (bool, error) {
var re = regexp.MustCompile(`(?mi)` + pattern)
groupNames := re.SubexpNames()
for _, match := range re.FindAllStringSubmatch(line, -1) {
for groupIdx, group := range match {
// if line should be ignored then lets return
if ignore {
return true, nil
}
name := groupNames[groupIdx]
if name == "" {
name = "raw"
}
tmpVars[name] = group
}
}
return true, nil
}