92 lines
1.8 KiB
Go
92 lines
1.8 KiB
Go
package csvparser
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import (
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"strings"
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"errors"
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)
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type EncloserId int
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const (
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None EncloserId = iota
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DoubleQuotes
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SingleQuotes
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RoundBrackets
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SquareBrackets
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CurlyBrackets
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)
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type Encloser struct {
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Open byte
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Close byte
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}
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var EnclosersRunes = map[EncloserId]Encloser{
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DoubleQuotes: Encloser{'"', '"'},
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SingleQuotes: Encloser{'\'', '\''},
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RoundBrackets: Encloser{'(', ')'},
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SquareBrackets: Encloser{'[', ']'},
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CurlyBrackets: Encloser{'{', '}'},
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}
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type CsvParser struct {
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Enclosers []EncloserId
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Delimiter string
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Fields []string
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Line string
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}
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func (parser *CsvParser) Init() {
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parser.Enclosers = []EncloserId{DoubleQuotes, SquareBrackets}
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parser.Delimiter = " \t"
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}
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func (parser *CsvParser) ExtractEnclosedFieldValue(line string, endChar byte) (string, error) {
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lineLen := len(line)
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for i := 1; i < lineLen; i++ {
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if line[i] == endChar && line[i-1] != '\\' {
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parser.Fields = append(parser.Fields, line[1:i])
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return line[i+1:], nil
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}
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}
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return line, errors.New("Encloser close not found")
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}
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func (parser *CsvParser) Parse(line string) error {
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var err error = nil
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for len(line) > 0 {
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line = strings.TrimLeft(line, parser.Delimiter)
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line = strings.TrimRight(line, parser.Delimiter)
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if len(line) == 0 {
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break
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}
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// Search for an encloser
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encloserId := None
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for _, id := range parser.Enclosers {
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if line[0] == EnclosersRunes[id].Open {
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encloserId = id
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break
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}
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}
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if encloserId != None {
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line, err = parser.ExtractEnclosedFieldValue(line, EnclosersRunes[encloserId].Close)
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if err != nil {
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return err
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}
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} else {
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nextSpace := strings.IndexAny(line, parser.Delimiter)
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if nextSpace != -1 {
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parser.Fields = append(parser.Fields, line[:nextSpace])
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line = line[nextSpace:]
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} else {
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parser.Fields = append(parser.Fields, line)
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line = ""
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break
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}
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}
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}
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return nil
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}
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