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file_impl.go
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file_impl.go
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package xlsx
import (
"archive/zip"
"compress/flate"
"encoding/xml"
"fmt"
"io"
"os"
"path"
"regexp"
"strconv"
"github.com/gofika/util/gobutil"
"github.com/gofika/xlsx/internal"
"github.com/gofika/xlsx/packaging"
)
// fileImpl define for operation xlsx file
type fileImpl struct {
xFile *packaging.XFile
ss *sharedStrings
}
func newFile(opts ...Option) *fileImpl {
o := internal.Settings{
DefaultFontName: DefaultFontName,
DefaultFontSize: DefaultFontSize,
DefaultSheetName: DefaultSheetName,
}
for _, opt := range opts {
opt.Apply(&o)
}
f := &fileImpl{
xFile: packaging.NewDefaultFile(o.DefaultFontName, o.DefaultFontSize, o.DefaultSheetName),
}
f.ss = newSharedStrings(f)
return f
}
// openFile open a xlsx *fileImpl
func openFile(name string) (*fileImpl, error) {
f, err := os.Open(name)
if err != nil {
return nil, err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return nil, err
}
return openFileReader(f, fi.Size())
}
// openFile open a xlsx *fileImpl
func openFileReader(r io.ReaderAt, size int64) (*fileImpl, error) {
f := &fileImpl{
xFile: &packaging.XFile{
ContentTypes: &packaging.XContentTypes{},
Worksheets: []*packaging.XWorksheet{},
Workbook: &packaging.XWorkbook{},
WorkbookRelationships: &packaging.XRelationships{},
RootRelationships: &packaging.XRelationships{},
ExtendedProperties: &packaging.XExtendedProperties{},
CoreProperties: &packaging.XCoreProperties{},
Themes: []*packaging.XTheme{},
StyleSheet: &packaging.XStyleSheet{},
SharedStrings: &packaging.XSharedStrings{},
},
}
f.ss = newSharedStrings(f)
zr, err := zip.NewReader(r, size)
if err != nil {
return nil, err
}
err = f.readParts(zr)
if err != nil {
return nil, err
}
return f, nil
}
// SaveFile save xlsx file
func (f *fileImpl) SaveFile(name string) error {
file, err := os.Create(name)
if err != nil {
return nil
}
err = f.Save(file)
errClose := file.Close()
if err != nil {
return err
}
return errClose
}
// Save save to steam
func (f *fileImpl) Save(w io.Writer) error {
zipWriter := zip.NewWriter(w)
zipWriter.RegisterCompressor(zip.Deflate, func(out io.Writer) (io.WriteCloser, error) {
return flate.NewWriter(out, flate.BestCompression)
})
err := f.writeParts(zipWriter)
errClose := zipWriter.Close()
if err != nil {
return err
}
return errClose
}
func writePart(zipWriter *zip.Writer, name string, part any) error {
w, err := zipWriter.Create(name)
if err != nil {
return err
}
_, err = w.Write([]byte(packaging.XMLProlog))
if err != nil {
return err
}
xmlWriter := xml.NewEncoder(w)
// for easy look
xmlWriter.Indent("", " ")
err = xmlWriter.Encode(part)
if err != nil {
return err
}
return nil
}
func (f *fileImpl) writeParts(zipWriter *zip.Writer) error {
// RootRelationships _rels/.rels
err := writePart(zipWriter, path.Join(packaging.RootRelationshipsPath, packaging.RootRelationshipsFileName), f.xFile.RootRelationships)
if err != nil {
return err
}
// Workbook xl/workbook.xml
err = writePart(zipWriter, path.Join(packaging.WorkbookPath, packaging.WorkbookFileName), f.xFile.Workbook)
if err != nil {
return err
}
// WorkbookRelationships xl/_rels/workbook.xml.rels
err = writePart(zipWriter, path.Join(packaging.WorkbookRelationshipsPath, packaging.WorkbookRelationshipsFileName), f.xFile.WorkbookRelationships)
if err != nil {
return err
}
// CoreProperties docProps/core.xml
err = writePart(zipWriter, path.Join(packaging.CorePropertiesPath, packaging.CorePropertiesFileName), f.xFile.CoreProperties)
if err != nil {
return err
}
// ExtendedProperties docProps/app.xml
err = writePart(zipWriter, path.Join(packaging.ExtendedPropertiesPath, packaging.ExtendedPropertiesFileName), f.xFile.ExtendedProperties)
if err != nil {
return err
}
// Worksheets xl/worksheets/sheet?.xml
for i, worksheet := range f.xFile.Worksheets {
err = writePart(zipWriter, path.Join(packaging.WorksheetPath, fmt.Sprintf(packaging.WorksheetFileName, i+1)), worksheet)
if err != nil {
return err
}
}
// Themes xl/theme/theme?.xml
for i, theme := range f.xFile.Themes {
err = writePart(zipWriter, path.Join(packaging.ThemePath, fmt.Sprintf(packaging.ThemeFileName, i+1)), theme)
if err != nil {
return err
}
}
// StyleSheet xl/styles.xml
err = writePart(zipWriter, path.Join(packaging.StyleSheetPath, packaging.StyleSheetFileName), f.xFile.StyleSheet)
if err != nil {
return err
}
// SharedStrings xl/sharedStrings.xml
if f.xFile.SharedStrings != nil && f.xFile.SharedStrings.Count > 0 {
err = writePart(zipWriter, path.Join(packaging.SharedStringsPath, packaging.SharedStringsFileName), f.xFile.SharedStrings)
if err != nil {
return err
}
}
// ContentTypes [Content_Types].xml
err = writePart(zipWriter, path.Join(packaging.ContentTypesPath, packaging.ContentTypesFileName), f.xFile.ContentTypes)
if err != nil {
return err
}
return nil
}
func readPart(zipReader *zip.Reader, name string, part any) error {
var zFile *zip.File
for _, z := range zipReader.File {
if z.Name == name {
zFile = z
break
}
}
if zFile == nil {
return fmt.Errorf("readPart file %s not exist", name)
}
r, err := zFile.Open()
if err != nil {
return err
}
xmlReader := xml.NewDecoder(r)
return xmlReader.Decode(part)
}
// readRootRelationships load from _rels/.rels
func readRootRelationships(zipReader *zip.Reader, xFile *packaging.XFile) error {
err := readPart(zipReader, path.Join(packaging.RootRelationshipsPath, packaging.RootRelationshipsFileName), xFile.RootRelationships)
if err != nil {
return err
}
for _, relationship := range xFile.RootRelationships.Relationships {
switch relationship.Type {
case packaging.WorkbookRelationshipType: // xl/workbook.xml
var workbookU packaging.XWorkbookU // fix xml ns bug
err = readPart(zipReader, relationship.Target, &workbookU)
if err != nil {
return err
}
err = gobutil.DeepCopy(xFile.Workbook, &workbookU)
if err != nil {
return err
}
// xl/_rels/workbook.xml.rels
err = readPart(zipReader, path.Join(packaging.WorkbookRelationshipsPath, packaging.WorkbookRelationshipsFileName), xFile.WorkbookRelationships)
if err != nil {
return err
}
case packaging.CorePropertiesRelationshipType: // docProps/core.xml
var corePropertiesU packaging.XCorePropertiesU // fix xml ns bug
err := readPart(zipReader, relationship.Target, &corePropertiesU)
if err != nil {
return err
}
err = gobutil.DeepCopy(xFile.CoreProperties, &corePropertiesU)
if err != nil {
return err
}
case packaging.ExtendedPropertiesRelationshipType: // docProps/app.xml
var extendedPropertiesU packaging.XExtendedPropertiesU // fix xml ns bug
err := readPart(zipReader, relationship.Target, &extendedPropertiesU)
if err != nil {
return err
}
err = gobutil.DeepCopy(xFile.ExtendedProperties, &extendedPropertiesU)
if err != nil {
return err
}
default:
return fmt.Errorf("readParts: unknown relationship type %s", relationship.Type)
}
}
return nil
}
// readWorkbookRelationships load from xl/_rels/workbook.xml.rels
func readWorkbookRelationships(zipReader *zip.Reader, xFile *packaging.XFile) (err error) {
for _, relationship := range xFile.WorkbookRelationships.Relationships {
switch relationship.Type {
case packaging.WorksheetRelationshipType: // worksheets/sheet?.xml
re, _ := regexp.Compile(`worksheets/sheet([1-9][0-9]*).xml`)
mcs := re.FindStringSubmatch(relationship.Target)
if len(mcs) < 2 {
return fmt.Errorf("readParts: unknown sheet target exp %s", relationship.Target)
}
sheetIndex, _ := strconv.Atoi(mcs[1])
relationship.Index = sheetIndex
for len(xFile.Worksheets) < sheetIndex {
xFile.Worksheets = append(xFile.Worksheets, &packaging.XWorksheet{})
}
err = readPart(zipReader, path.Join("xl", relationship.Target), xFile.Worksheets[sheetIndex-1])
if err != nil {
return
}
case packaging.ThemeRelationshipType: // theme/theme?.xml
re, _ := regexp.Compile(`theme/theme([1-9][0-9]*).xml`)
mcs := re.FindStringSubmatch(relationship.Target)
if len(mcs) < 2 {
return fmt.Errorf("readParts: unknown theme target exp %s", relationship.Target)
}
themeIndex, _ := strconv.Atoi(mcs[1])
relationship.Index = themeIndex
for len(xFile.Themes) < themeIndex {
xFile.Themes = append(xFile.Themes, &packaging.XTheme{})
}
var themeU packaging.XThemeU // fix xml ns bug
err = readPart(zipReader, path.Join("xl", relationship.Target), &themeU)
if err != nil {
return
}
err = gobutil.DeepCopy(xFile.Themes[themeIndex-1], &themeU)
if err != nil {
return
}
case packaging.StyleSheetRelationshipType: // styles.xml
var styleSheetU packaging.XStyleSheetU
err = readPart(zipReader, path.Join("xl", relationship.Target), &styleSheetU)
if err != nil {
return
}
err = gobutil.DeepCopy(xFile.StyleSheet, &styleSheetU)
if err != nil {
return
}
case packaging.SharedStringsRelationshipType: // sharedStrings.xml
err = readPart(zipReader, path.Join("xl", relationship.Target), &xFile.SharedStrings)
if err != nil {
return
}
default:
return fmt.Errorf("[xl/_rels/workbook.xml.rels] Unknown Relationship Type: %s", relationship.Type)
}
}
return nil
}
// readParts load from *zip.Reader
func (f *fileImpl) readParts(zipReader *zip.Reader) (err error) {
// _rels/.rels
err = readRootRelationships(zipReader, f.xFile)
if err != nil {
return
}
// xl/_rels/workbook.xml.rels
err = readWorkbookRelationships(zipReader, f.xFile)
if err != nil {
return
}
// [Content_Types].xml
err = readPart(zipReader, path.Join(packaging.ContentTypesPath, packaging.ContentTypesFileName), f.xFile.ContentTypes)
if err != nil {
return
}
// init data
f.ss.calcMap()
return
}
// OpenSheet open a exist *sheetImpl by name
//
// Example:
//
// sheet := file.OpenSheet("Sheet1")
//
// return nil if sheet not exist
func (f *fileImpl) OpenSheet(name string) Sheet {
name = trimSheetName(name)
for i, sheet := range f.xFile.Workbook.Sheets.Sheet {
if sheet.Name == name {
return newSheet(f, sheet, i)
}
}
return nil
}
func (f *fileImpl) getWorkbook() *packaging.XWorkbook {
return f.xFile.Workbook
}
func (f *fileImpl) getExtendedProperties() *packaging.XExtendedProperties {
return f.xFile.ExtendedProperties
}
// NewSheet create a new *sheetImpl with sheet name
// Example:
//
// sheet := file.NewSheet("Sheet2")
func (f *fileImpl) NewSheet(name string) Sheet {
name = trimSheetName(name)
if f.OpenSheet(name) != nil {
return nil
}
// append worksheet
sheetID := 0
workbook := f.getWorkbook()
sheetIndex := len(workbook.Sheets.Sheet)
for _, sheet := range workbook.Sheets.Sheet {
if sheet.SheetID > sheetID {
sheetID = sheet.SheetID
}
}
sheetID++ // new sheetId
worksheet := packaging.NewDefaultXWorksheet()
f.xFile.Worksheets = append(f.xFile.Worksheets, worksheet)
// update workbook.xml.rels
f.xFile.WorkbookRelationships = packaging.NewWorkbookXRelationships(f.xFile)
rID := 0
for _, i := range f.xFile.WorkbookRelationships.Relationships {
if i.Type != packaging.WorksheetRelationshipType {
continue
}
id, _ := strconv.Atoi(i.ID[3:])
if id > rID {
rID = id
}
}
// update workbook.xml
sheet := &packaging.XSheet{
Name: name,
SheetID: sheetID,
Rid: fmt.Sprintf("rId%d", rID),
}
workbook.Sheets.Sheet = append(workbook.Sheets.Sheet, sheet)
// update docProps/app.xml
extendedProperties := f.getExtendedProperties()
headingPairsVector := newVector(extendedProperties.HeadingPairs.Vector)
headingPairs := headingPairsVector.GetIntPairs()
headingPairs["Worksheets"]++
headingPairsVector.SetIntPairs(headingPairs)
titlesOfPartsVector := newVector(extendedProperties.TitlesOfParts.Vector)
titlesOfPartsVector.AppendString(name)
// update [Content_Types].xml
f.xFile.ContentTypes = packaging.NewXContentTypes(f.xFile.WorkbookRelationships)
return newSheet(f, sheet, sheetIndex)
}
func (f *fileImpl) Sheets() (sheets []Sheet) {
sheets = []Sheet{}
for i, sheet := range f.xFile.Workbook.Sheets.Sheet {
sheets = append(sheets, newSheet(f, sheet, i))
}
return
}