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csv2json.go
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/
csv2json.go
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package main
import (
"encoding/csv"
"encoding/json"
"fmt"
"io"
"log"
"os"
"strconv"
)
func csv2json(r io.Reader) ([]byte, error) {
var first_row bool = true
title_row := make([]string, 0)
rows := make(map[string]map[string]string)
csvReader := csv.NewReader(r)
csvReader.TrimLeadingSpace = true
var c int = 0
for {
record, err := csvReader.Read()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if first_row == true {
title_row = make([]string, len(record))
copy(title_row, record)
first_row = false
continue
}
// log.Println(record)
row := make(map[string]string)
for i, n := range title_row {
row[n] = record[i]
}
// rows = append(rows, row)
rows[strconv.Itoa(c)] = row
c++
}
data, err := json.MarshalIndent(&rows, "", " ")
if err != nil {
return nil, err
}
return data, nil
}
func usage() {
fmt.Println("Usage:")
fmt.Println("\tgo run csv2josn.go <csv>")
}
func main() {
if len(os.Args) != 2 {
usage()
os.Exit(-1)
}
var in_file_name = os.Args[1]
in_file, err := os.Open(in_file_name)
if err != nil {
log.Fatalf("%s is not existed.\n", in_file_name)
os.Exit(-1)
}
defer in_file.Close()
jsonData, err := csv2json(in_file)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(jsonData))
}