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csv.go
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csv.go
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package fda
import (
"encoding/csv"
"fmt"
"os"
"path/filepath"
)
// CSVHandler handles CSV file.
type CSVHandler struct {
header []string
headerMap map[string]int
reader *csv.Reader
}
// NewCSVHandler returns initialized *CSVHandler
func NewCSVHandler(file string) (*CSVHandler, error) {
info, err := os.Stat(file)
if err == nil && info.IsDir() {
return nil, fmt.Errorf("'%s' is dir, please set file path.", file)
}
// load file
fp, err := os.Open(file)
if err != nil {
return nil, err
}
// load csv
reader := csv.NewReader(fp)
reader.LazyQuotes = true
switch filepath.Ext(file) {
case ".tsv":
reader.Comma = '\t'
}
header, err := reader.Read()
if err != nil {
return nil, err
}
headerMap := make(map[string]int)
for i, col := range header {
headerMap[col] = i
}
return &CSVHandler{
header: header,
headerMap: headerMap,
reader: reader,
}, nil
}
// ReadAll reads all lines from CSV file.
func (f *CSVHandler) ReadAll() ([]map[string]string, error) {
if f.reader == nil {
return nil, fmt.Errorf("f.reader is nil")
}
lines, err := f.reader.ReadAll()
if err != nil {
return nil, err
}
header := f.header
result := make([]map[string]string, len(lines))
for i, line := range lines {
r := make(map[string]string)
for j, col := range line {
r[header[j]] = col
}
result[i] = r
}
return result, nil
}