From d6958291fb986cd0d67f15e0d8b68e7b3f49d675 Mon Sep 17 00:00:00 2001
From: Laurent ULRICH <laurentu@gmail.com>
Date: Mon, 21 Mar 2022 20:37:26 +0000
Subject: [PATCH] Parser implemented but absolutly not tested

---
 csv-parser.go | 103 +++++++++++++++++++++++---------------------------
 1 file changed, 47 insertions(+), 56 deletions(-)

diff --git a/csv-parser.go b/csv-parser.go
index ba55a06..0ee8417 100644
--- a/csv-parser.go
+++ b/csv-parser.go
@@ -2,11 +2,14 @@ package csvparser
 
 import (
 	"strings"
+	"errors"
 )
+
 type EncloserId int
 
 const (
-	DoubleQuotes EncloserId = iota
+	None EncloserId = iota
+	DoubleQuotes
 	SingleQuotes
 	RoundBrackets
 	SquareBrackets
@@ -14,8 +17,8 @@ const (
 )
 
 type Encloser struct {
-	Open  rune
-	Close rune
+	Open  byte
+	Close byte
 }
 
 var EnclosersRunes = map[EncloserId]Encloser{
@@ -27,74 +30,62 @@ var EnclosersRunes = map[EncloserId]Encloser{
 }
 
 type CsvParser struct {
-	Enclosers []EncloserId
-	Delimiter rune
-	DelimiterString string
+	Enclosers       []EncloserId
+	Delimiter       string
+	Fields		[]string
+	Line		string
 }
 
 func (parser *CsvParser) Init() {
 	parser.Enclosers = []EncloserId{DoubleQuotes, SquareBrackets}
-	parser.Delimiter = ' '
-	parser.DelimiterString = string(parser.Delimiter)
+	parser.Delimiter = " \t"
 }
+
+func (parser *CsvParser) ExtractEnclosedFieldValue(line string, endChar byte) (string, error) {
+	lineLen := len(line)
+	for i := 1; i < lineLen; i++ {
+		if line[i] == endChar && line[i-1] != '\\' {
+			parser.Fields = append(parser.Fields, line[1:i])
+			return line[i+1:], nil
+		}
+	}
+	return line, errors.New("Encloser close not found")
+}
+
 func (parser *CsvParser) Parse(line string) error {
+	var err error = nil
 	for len(line) > 0 {
-		line = strings.TrimLeft(line, parser.DelimiterString)
-		line = strings.TrimRight(line, parser.DelimiterString)
+		line = strings.TrimLeft(line, parser.Delimiter)
+		line = strings.TrimRight(line, parser.Delimiter)
 
 		if len(line) == 0 {
 			break
 		}
 		// Search for an encloser
-		for id := range parser.Enclosers {
+		encloserId := None
+		for _, id := range parser.Enclosers {
 			if line[0] == EnclosersRunes[id].Open {
-				endChar := EnclosersRunes[id].Close
-				endOfFieldFound := false
-				l := len(line)
-				for i := 1; i < l; i++ {
-					if line[i] == endChar && line[i-1] != '\\' {
-						fields = append(fields, line[1:i])
-						line = line[i+1:]
-						endOfFieldFound = true
-						break
-					}
-				}
-				if !endOfFieldFound {
-					return nil, errors.New("#ERR: bad format")
-				}
-				break;
-			}
-		}
-		if line[0] == '"' || line[0] == '[' {
-			var endChar byte = '"'
-			if line[0] == '[' {
-				endChar = ']'
-			}
-			endOfFieldFound := false
-			l := len(line)
-			for i := 1; i < l; i++ {
-				if line[i] == endChar && line[i-1] != '\\' {
-					fields = append(fields, line[1:i])
-					line = line[i+1:]
-					endOfFieldFound = true
-					break
-				}
-			}
-			if !endOfFieldFound {
-				return nil, errors.New("#ERR: bad format")
-			}
-		} else {
-			nextSpace := strings.IndexAny(line, " \t")
-			if nextSpace != -1 {
-				fields = append(fields, line[:nextSpace])
-				line = line[nextSpace:]
-			} else {
-				fields = append(fields, line)
-				line = ""
+				encloserId = id
 				break
 			}
 		}
-	}
-	return fields, nil
+		if encloserId != None {
+			line, err = parser.ExtractEnclosedFieldValue(line, EnclosersRunes[encloserId].Close)
+			if err != nil {
+				return err
+			}
+		} else {
+			nextSpace := strings.IndexAny(line, parser.Delimiter)
+			if nextSpace != -1 {
+				parser.Fields = append(parser.Fields, line[:nextSpace])
+				line = line[nextSpace:]
+			} else {
+				parser.Fields = append(parser.Fields, line)
+				line = ""
+				break
+			}
 
+		}
+	}
+	return nil
 }