Algo ok, mais peut-être à optimiser ?
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parent
f92b89e01e
commit
367bd16e42
125
csvparser.go
125
csvparser.go
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@ -9,8 +9,10 @@ import (
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type CsvParser struct {
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enclosers []string
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delimiters string
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mergeDelimiters string
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mergeDelimiters bool
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fields []string
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ignore string
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maxFieldIndex int
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}
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/*
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@ -18,8 +20,9 @@ type CsvParser struct {
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* mergeDelimiters: if true, all successive delimiters are considered as one
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* enclosers: array of string, each string contains a enclorser tuple: "", [], {}...
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* lineFormat: format of the line (each fieldname or ignore)
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*/
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func (p *CsvParser) Initialize(delimiters string, mergeDelimiters bool, enclosers []string, lineFormat string) error {
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*/
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func (p *CsvParser) Initialize(delimiters string, mergeDelimiters bool, enclosers []string, lineFormat string, ignore string) error {
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if utf8.RuneCountInString(delimiters) == 0 {
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return fmt.Errorf("delimiter shoud be at least one character")
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}
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@ -31,85 +34,103 @@ func (p *CsvParser) Initialize(delimiters string, mergeDelimiters bool, encloser
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}
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}
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p.enclosers = enclosers
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p.ignore = ignore
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// line format is in the form of: field1 field2 ignore ...
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// if field name is ignore, it is parsed but not retained
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p.fields = strings.Split(lineFormat, " ")
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fields := strings.Split(lineFormat, " ")
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p.fields = make([]string, 0)
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for _, f := range fields {
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if len(f) > 0 {
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p.fields = append(p.fields, f)
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}
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}
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p.maxFieldIndex = len(p.fields) - 1
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return nil
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}
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type parserState struct {
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delimiter bool
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enclosed bool
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encloserEnd rune
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type ParserState struct {
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inField bool // reading field value
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delimiter bool // last char was a delimiter
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escape bool // the previaus char was a escaper \\
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enclosed bool // the current field is enclosed
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enclosedMode bool // the current algo is for enclosed string, do not search delimiter
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encloserStart rune // the current enclosed field opener char
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encloserEnd rune // the current enclosed field closer char
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}
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/*
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* si pas dans la lecture d'un champ
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*/
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func (p *CsvParser) Parse(line string) (map[string]string, error) {
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currentFieldIndex := 0
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valueStart := -1
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escape := false
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enclosed := false
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//valueEnd := -1
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state := ParserState{inField: false, delimiter: true, escape: false, enclosed: false, enclosedMode: false, encloserStart: '?', encloserEnd: '?'}
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ret := make(map[string]string)
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indexMax := len(line) - 1
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maxFieldIndex := len(p.fields) - 1
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delimiters := p.delimiters
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delimiter := false
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maxIndex := len(line) - 1
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for index, r := range line {
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if r == '\\' {
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// Check if EOL before continue
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escape = true
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state.escape = true
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continue
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}
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if escape {
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escape = false
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// previous rune was \\: ignore the current rune
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if state.escape {
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state.escape = false
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continue
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}
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for _, d := range delimiters {
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// reading en enclosed field: watch for end of this field (encloserEnd)
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if state.enclosedMode {
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// searching for end of encloser
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if r == state.encloserEnd {
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state.enclosedMode = false
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}
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if index < maxIndex {
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continue
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}
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}
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isDelimiter := false
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for _, d := range p.delimiters {
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if r == d {
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delimiter = true
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isDelimiter = true
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break
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}
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}
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if delimiter && valueStart > -1 {
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if p.fields[currentFieldIndex] != "ignore" {
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ret[p.fields[currentFieldIndex]] = line[valueStart:index]
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}
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currentFieldIndex++
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}
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if delimiter {
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if p.fields[currentFieldIndex] != "ignore" {
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ret[p.fields[currentFieldIndex]] = line[valueStart:index]
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}
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currentFieldIndex++
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if currentFieldIndex > maxFieldIndex {
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break
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}
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valueStart = index + 1
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if enclosed {
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enclosed = false
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delimiters = p.delimiters
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// Omit next delimiter
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escape = true
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}
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// previous rune was a delimiter and mergeDelimiters is true, skip
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if isDelimiter && state.delimiter && p.mergeDelimiters {
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continue
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}
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if index >= indexMax {
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if p.fields[currentFieldIndex] != "ignore" {
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ret[p.fields[currentFieldIndex]] = line[valueStart:]
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// current rune is a delimiter, a value is present and the next char is the next value
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if isDelimiter || index == maxIndex {
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state.delimiter = true
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field := line[valueStart:index]
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if state.enclosed {
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field = strings.TrimRight(strings.TrimLeft(field, string(state.encloserStart)), string(state.encloserEnd))
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}
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if currentFieldIndex <= p.maxFieldIndex && p.fields[currentFieldIndex] != p.ignore {
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ret[p.fields[currentFieldIndex]] = field
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}
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currentFieldIndex++
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state = ParserState{inField: false, delimiter: true, escape: false, enclosed: false, enclosedMode: false, encloserStart: '?', encloserEnd: '?'}
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continue
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}
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for _, encloser := range p.enclosers {
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runes := []rune(encloser)
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if state.delimiter {
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valueStart = index
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for _, e := range p.enclosers {
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runes := []rune(e)
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if r == runes[0] {
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// opening encloser
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enclosed = true
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delimiters = string(runes[1])
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valueStart++
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break
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state.enclosed = true
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state.enclosedMode = true
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state.encloserStart = runes[0]
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state.encloserEnd = runes[1]
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}
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state.delimiter = false
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}
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}
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}
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@ -7,8 +7,9 @@ import (
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func TestCorrectLines(t *testing.T) {
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var csvParser CsvParser
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csvParser.Initialize(" ", []string{"\"\"", "[]"}, "firstname lastname complete_name")
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line := ""
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/*
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csvParser.Initialize(" ", false, []string{"\"\"", "[]"}, "firstname lastname complete_name")
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fmt.Println("parsing:", line)
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event, err := csvParser.Parse(line)
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if err != nil {
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@ -62,10 +63,27 @@ func TestCorrectLines(t *testing.T) {
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if err != nil {
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t.Fatalf("Parsing of empty line failed %v %v", err, event)
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}
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csvParser.Initialize(" \t", []string{"\"\"", "[]"}, "ignore ignore ignore proxy ignore domain clientip ignore ignore apache-date request status bytes duration referer user-agent")
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fmt.Println("event is", event)
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*/
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csvParser.Initialize(" \t", true, []string{"\"\"", "[]"}, "ignore ignore ignore proxy ignore domain clientip ignore ignore apache-date request status bytes duration referer user-agent", "ignore")
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line = "Aug 7 00:00:00 proxy-4 haproxy[17429]: www.yvelines.gouv.fr 66.249.64.10 - - [06/Aug/2024:23:59:59 +0200] \"GET /content/download/19274/117923/file/SE_EAU_20190325_LesJardines_78201900027_LetNotifCompletude+recepisse.pdf HTTP/1.1\" 301 1414 240 \"\" \"Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.6478.182 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)\" \"-\" \"GB\" \"15169\""
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fmt.Println("parsing:", line)
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event, err := csvParser.Parse(line)
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if err != nil {
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t.Fatalf("Parsing of empty line failed %v %v", err, event)
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}
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fmt.Println("event is", event)
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line = "Aug 7 00:00:00 proxy-4 haproxy[17429]: www.yvelines.gouv.fr 66.249.64.10 - - [06/Aug/2024:23:59:59 +0200] \"GET /content/download/19274/117923/file/SE_EAU_20190325_LesJardines_78201900027_LetNotifCompletude+recepisse.pdf HTTP/1.1\" 301 1414 240 \"\" \"Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.6478.182 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)\" \"-\" \"GB\" 15169"
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fmt.Println("parsing:", line)
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event, err = csvParser.Parse(line)
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if err != nil {
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t.Fatalf("Parsing of empty line failed %v %v", err, event)
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}
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fmt.Println("event is", event)
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line = "Aug 7 00:00:00 proxy-4 haproxy[17429]: www.yvelines.gouv.fr 66.249.64.10 - - [06/Aug/2024:23:59:59 +0200] \"GET /content/download/19274/117923/file/SE_EAU_20190325_LesJardines_78201900027_LetNotifCompletude+recepisse.pdf HTTP/1.1\" 301 1414 240 \"\" \"Mozilla/5.0 (Linux; Android 6.0.1; Nexus 5X Build/MMB29P) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.6478.182 Mobile Safari/537.36 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)\" \"-\" \"GB\" \"15169"
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fmt.Println("parsing:", line)
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event, err = csvParser.Parse(line)
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if err != nil {
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t.Fatalf("Parsing of empty line failed %v %v", err, event)
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