96 lines
2.0 KiB
Go
96 lines
2.0 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 Parser 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 *Parser) 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 *Parser) ExtractEnclosedFieldValue(endChar byte) error {
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lineLen := len(parser.Line)
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for i := 1; i < lineLen; i++ {
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if parser.Line[i] == endChar && parser.Line[i-1] != '\\' {
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parser.Fields = append(parser.Fields, parser.Line[0:i])
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parser.Line = parser.Line[i+1:]
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return nil
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}
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}
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return errors.New("Encloser close not found")
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}
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func (parser *Parser) Parse(CsvLine string) error {
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var err error = nil
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parser.Fields = make([]string,0)
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parser.Line = CsvLine
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for len(parser.Line) > 0 {
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parser.Line = strings.TrimLeft(parser.Line, parser.Delimiter)
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parser.Line = strings.TrimRight(parser.Line, parser.Delimiter)
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if len(parser.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 parser.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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parser.Line = parser.Line[1:]
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err = parser.ExtractEnclosedFieldValue(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(parser.Line, parser.Delimiter)
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if nextSpace != -1 {
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parser.Fields = append(parser.Fields, parser.Line[:nextSpace])
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parser.Line = parser.Line[nextSpace:]
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} else {
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parser.Fields = append(parser.Fields, parser.Line)
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parser.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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