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// Pack datmamaps handles datamap files and populated spreadsheets.
package datamaps
import (
"encoding/csv"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"path/filepath"
"strings"
// Required for the sqlite3 driver
_ "github.com/mattn/go-sqlite3"
"github.com/tealeg/xlsx"
"github.com/yulqen/coords"
)
type (
// SheetData is the data from the sheet
SheetData map[string]ExtractedCell
// FileData is the data from the file.
FileData map[string]SheetData
// ExtractedData is the Extraced data from the file, filtered by a Datamap.
ExtractedData map[string]map[string]xlsx.Cell
)
//DatamapLine - a line from the datamap.
type DatamapLine struct {
Key string
Sheet string
Cellref string
}
//ExtractedCell is data pulled from a cell.
type ExtractedCell struct {
Cell *xlsx.Cell
Col string
Row int
Value string
}
//sheetInSlice is a helper which returns true
// if a string is in a slice of strings.
func sheetInSlice(list []string, key string) bool {
for _, x := range list {
if x == key {
return true
}
}
return false
}
//getSheetNames returns the number of Sheet field entries
// in a slice of DatamapLine structs.
func getSheetNames(dmls []DatamapLine) []string {
var sheetNames []string
for _, dml := range dmls {
if !sheetInSlice(sheetNames, dml.Sheet) {
sheetNames = append(sheetNames, dml.Sheet)
}
}
return sheetNames
}
//ReadDML returns a slice of DatamapLine structs.
func ReadDML(path string) ([]DatamapLine, error) {
var s []DatamapLine
data, err := ioutil.ReadFile(path)
if err != nil {
return s, fmt.Errorf("Cannot find file: %s", path)
}
r := csv.NewReader(strings.NewReader(string(data)))
for {
record, err := r.Read()
if err == io.EOF {
break
}
if err != nil {
return s, errors.New("Cannot read line %s")
}
if record[0] == "cell_key" {
// this must be the header
continue
}
dml := DatamapLine{
Key: strings.Trim(record[0], " "),
Sheet: strings.Trim(record[1], " "),
Cellref: strings.Trim(record[2], " ")}
s = append(s, dml)
}
return s, nil
}
// ReadXLSX returns the file's data as a map,
// keyed on sheet name. All values are returned as strings.
// Paths to a datamap and the spreadsheet file required.
func ReadXLSX(ssheet string) FileData {
// open the files
data, err := xlsx.OpenFile(ssheet)
if err != nil {
log.Fatal(err)
}
outer := make(FileData, 1)
// get the data
for _, sheet := range data.Sheets {
inner := make(SheetData)
for rowLidx, row := range sheet.Rows {
for colLidx, cell := range row.Cells {
colStr, err := coords.ColIndexToAlpha(colLidx)
if err != nil {
log.Fatal(err)
}
ex := ExtractedCell{
Cell: cell,
Col: colStr,
Row: rowLidx + 1,
Value: cell.Value}
cellref := fmt.Sprintf("%s%d", ex.Col, ex.Row)
inner[cellref] = ex
}
outer[sheet.Name] = inner
}
}
return outer
}
//Extract returns the file's data as a map,
// using the datamap as a filter, keyed on sheet name. All values
// are returned as strings.
// Paths to a datamap and the spreadsheet file required.
func Extract(dm string, ssheet string) ExtractedData {
xdata := ReadXLSX(ssheet)
ddata, err := ReadDML(dm)
if err != nil {
log.Fatal(err)
}
names := getSheetNames(ddata)
outer := make(ExtractedData, len(names))
inner := make(map[string]xlsx.Cell)
for _, i := range ddata {
sheet := i.Sheet
cellref := i.Cellref
if val, ok := xdata[sheet][cellref]; ok {
inner[cellref] = *val.Cell
outer[sheet] = inner
}
}
return outer
}
//GetTargetFiles finds all xlsx and xlsm files in directory.
func GetTargetFiles(path string) ([]string, error) {
if lastchar := path[len(path)-1:]; lastchar != string(filepath.Separator) {
return nil, fmt.Errorf("path must end in a %s character", string(filepath.Separator))
}
fullpath := strings.Join([]string{path, "*.xlsx"}, "")
output, err := filepath.Glob(fullpath)
if err != nil {
return nil, err
}
if output == nil {
return nil, fmt.Errorf("cannot find any xlsx files in %s", path)
}
return output, nil
}
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