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csvreader.go
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/
csvreader.go
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package database
import (
"bufio"
"context"
"fmt"
"io"
"strconv"
"strings"
"time"
"github.com/evocert/kwe/iorw"
)
//CSVReader -
type CSVReader struct {
rdr *Reader
bfr *bufio.Reader
err error
Headers bool
ColDelim string
RowDelim string
IncludeEOF bool
AltHeaders []string
pr *io.PipeReader
pw *io.PipeWriter
}
//NewCSVReader - over rdr*Reader
func NewCSVReader(rdr *Reader, err error, a ...interface{}) (csvr *CSVReader) {
csvr = &CSVReader{rdr: rdr, err: err, Headers: true, ColDelim: ",", RowDelim: "\r\n", AltHeaders: nil}
for len(a) > 0 {
var d = a[0]
if ctngs, ctngsok := d.(map[string]interface{}); ctngsok {
for ctngk := range ctngs {
ctngv := ctngs[ctngk]
if strings.ToLower(ctngk) == "coldelim" {
if cldelim, cldelimok := ctngv.(string); cldelimok {
if cldelim != "" {
csvr.ColDelim = cldelim
}
}
} else if strings.ToLower(ctngk) == "headers" {
if hdrs, hdrsok := ctngv.(bool); hdrsok {
csvr.Headers = hdrs
}
} else if strings.ToLower(ctngk) == "altheaders" {
if althdrs, althdrsok := ctngv.([]interface{}); althdrsok {
althrsds := make([]string, len(althdrs))
if len(althrsds) > 0 {
for n := range althdrs {
althrsds[n], _ = althdrs[n].(string)
}
csvr.AltHeaders = althrsds
}
}
}
}
}
a = a[1:]
}
return
}
//Read - refer to io.Reader
func (csvr *CSVReader) Read(p []byte) (n int, err error) {
if csvr.pr == nil && csvr.pw == nil {
csvr.pr, csvr.pw = io.Pipe()
ctx, ctxcancel := context.WithCancel(context.Background())
go func(rdr *Reader) {
defer func() {
csvr.pw.Close()
}()
//enc := json.NewEncoder(jsnr.pw)
ctxcancel()
if csvr.err == nil {
if rdr != nil {
var sval = func(v string) (s string) {
if v != "" {
if strings.Contains(v, csvr.ColDelim) || strings.Contains(v, "\"") {
s = "\"" + strings.Replace(v, "\"", "\"\"", -1) + "\""
} else {
s = v
}
}
return
}
var canPrintCols = false
var colcount = 0
var cls []string = nil
if csvr.Headers && len(csvr.AltHeaders) == 0 {
cls = rdr.cls[:]
canPrintCols = true
} else if len(csvr.AltHeaders) > 0 {
cls = csvr.AltHeaders[:]
canPrintCols = true
}
colcount = len(cls)
var dta []interface{} = nil
if nxt, nxterr := rdr.Next(); nxterr == nil {
if nxt {
dta = rdr.Data()
if colcount == 0 && len(dta) > 0 {
colcount = len(dta)
cls = make([]string, colcount)
for n := range cls {
cls[n] = "Column" + fmt.Sprintf("%d", n)
}
}
}
if canPrintCols && len(cls) > 0 {
for n := range cls {
c := cls[n]
iorw.Fprint(csvr.pw, sval(strings.ToUpper(c)))
if n < colcount-1 {
iorw.Fprint(csvr.pw, csvr.ColDelim)
}
}
}
var firstRow = true
for {
if nxt && len(dta) == colcount {
if firstRow {
firstRow = false
if canPrintCols {
iorw.Fprint(csvr.pw, csvr.RowDelim)
}
} else {
iorw.Fprint(csvr.pw, csvr.RowDelim)
}
for n := range dta {
d := dta[n]
if s, sok := d.(string); sok {
if fltval, nrerr := strconv.ParseFloat(s, 64); nrerr == nil {
if tstintval := int64(fltval); float64(tstintval) == fltval {
iorw.Fprint(csvr.pw, fmt.Sprintf("%d", tstintval))
} else {
iorw.Fprint(csvr.pw, fmt.Sprintf("%.0f", fltval))
}
} else if intval, nrerr := strconv.ParseInt(s, 10, 64); nrerr == nil {
iorw.Fprint(csvr.pw, fmt.Sprintf("%d", intval))
} else {
if _, terr := time.Parse("2006-01-02T15:04:05", s); terr == nil {
iorw.Fprint(csvr.pw, strings.Replace(s, "T", " ", -1))
} else {
iorw.Fprint(csvr.pw, sval(s))
}
}
} else if t, tok := d.(time.Time); tok {
iorw.Fprint(csvr.pw, t)
} else {
iorw.Fprint(csvr.pw, d)
}
if n < colcount-1 {
iorw.Fprint(csvr.pw, csvr.ColDelim)
}
}
nxt, nxterr = rdr.Next()
if nxterr != nil {
nxt = false
} else if nxt {
dta = rdr.Data()
}
} else {
break
}
}
if csvr.IncludeEOF {
iorw.Fprint(csvr.pw, csvr.RowDelim)
}
}
}
}
}(csvr.rdr)
<-ctx.Done()
ctx = nil
}
if csvr.pr != nil {
n, err = csvr.pr.Read(p)
}
if n == 0 && err == nil {
err = io.EOF
}
return
}
//ReadRune - refer to io.RuneReader
func (csvr *CSVReader) ReadRune() (r rune, size int, err error) {
if csvr.bfr == nil {
csvr.bfr = bufio.NewReader(csvr)
}
r, size, err = csvr.bfr.ReadRune()
return
}