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lib.go
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package xlsx
import (
"archive/zip"
"encoding/xml"
"errors"
"fmt"
"io"
"path"
"strconv"
"strings"
)
// XLSXReaderError is the standard error type for otherwise undefined
// errors in the XSLX reading process.
type XLSXReaderError struct {
Err string
}
// String() returns a string value from an XLSXReaderError struct in
// order that it might comply with the os.Error interface.
func (e *XLSXReaderError) Error() string {
return e.Err
}
// getRangeFromString is an internal helper function that converts
// XLSX internal range syntax to a pair of integers. For example,
// the range string "1:3" yield the upper and lower intergers 1 and 3.
func getRangeFromString(rangeString string) (lower int, upper int, error error) {
var parts []string
parts = strings.SplitN(rangeString, ":", 2)
if parts[0] == "" {
error = errors.New(fmt.Sprintf("Invalid range '%s'\n", rangeString))
}
if parts[1] == "" {
error = errors.New(fmt.Sprintf("Invalid range '%s'\n", rangeString))
}
lower, error = strconv.Atoi(parts[0])
if error != nil {
error = errors.New(fmt.Sprintf("Invalid range (not integer in lower bound) %s\n", rangeString))
}
upper, error = strconv.Atoi(parts[1])
if error != nil {
error = errors.New(fmt.Sprintf("Invalid range (not integer in upper bound) %s\n", rangeString))
}
return lower, upper, error
}
// lettersToNumeric is used to convert a character based column
// reference to a zero based numeric column identifier.
func lettersToNumeric(letters string) int {
sum, mul, n := 0, 1, 0
for i := len(letters) - 1; i >= 0; i, mul, n = i-1, mul*26, 1 {
c := letters[i]
switch {
case 'A' <= c && c <= 'Z':
n += int(c - 'A')
case 'a' <= c && c <= 'z':
n += int(c - 'a')
}
sum += n * mul
}
return sum
}
// Get the largestDenominator that is a multiple of a basedDenominator
// and fits at least once into a given numerator.
func getLargestDenominator(numerator, multiple, baseDenominator, power int) (int, int) {
if numerator/multiple == 0 {
return 1, power
}
next, nextPower := getLargestDenominator(
numerator, multiple*baseDenominator, baseDenominator, power+1)
if next > multiple {
return next, nextPower
}
return multiple, power
}
// Convers a list of numbers representing a column into a alphabetic
// representation, as used in the spreadsheet.
func formatColumnName(colId []int) string {
lastPart := len(colId) - 1
result := ""
for n, part := range colId {
if n == lastPart {
// The least significant number is in the
// range 0-25, all other numbers are 1-26,
// hence we use a differente offset for the
// last part.
result += string(part + 65)
} else {
// Don't output leading 0s, as there is no
// representation of 0 in this format.
if part > 0 {
result += string(part + 64)
}
}
}
return result
}
func smooshBase26Slice(b26 []int) []int {
// Smoosh values together, eliminating 0s from all but the
// least significant part.
lastButOnePart := len(b26) - 2
for i := lastButOnePart; i > 0; i-- {
part := b26[i]
if part == 0 {
greaterPart := b26[i-1]
if greaterPart > 0 {
b26[i-1] = greaterPart - 1
b26[i] = 26
}
}
}
return b26
}
func intToBase26(x int) (parts []int) {
// Excel column codes are pure evil - in essence they're just
// base26, but they don't represent the number 0.
b26Denominator, _ := getLargestDenominator(x, 1, 26, 0)
// This loop terminates because integer division of 1 / 26
// returns 0.
for d := b26Denominator; d > 0; d = d / 26 {
value := x / d
remainder := x % d
parts = append(parts, value)
x = remainder
}
return parts
}
// numericToLetters is used to convert a zero based, numeric column
// indentifier into a character code.
func numericToLetters(colRef int) string {
parts := intToBase26(colRef)
return formatColumnName(smooshBase26Slice(parts))
}
// letterOnlyMapF is used in conjunction with strings.Map to return
// only the characters A-Z and a-z in a string
func letterOnlyMapF(rune rune) rune {
switch {
case 'A' <= rune && rune <= 'Z':
return rune
case 'a' <= rune && rune <= 'z':
return rune - 32
}
return -1
}
// intOnlyMapF is used in conjunction with strings.Map to return only
// the numeric portions of a string.
func intOnlyMapF(rune rune) rune {
if rune >= 48 && rune < 58 {
return rune
}
return -1
}
// getCoordsFromCellIDString returns the zero based cartesian
// coordinates from a cell name in Excel format, e.g. the cellIDString
// "A1" returns 0, 0 and the "B3" return 1, 2.
func getCoordsFromCellIDString(cellIDString string) (x, y int, error error) {
var letterPart string = strings.Map(letterOnlyMapF, cellIDString)
y, error = strconv.Atoi(strings.Map(intOnlyMapF, cellIDString))
if error != nil {
return x, y, error
}
y -= 1 // Zero based
x = lettersToNumeric(letterPart)
return x, y, error
}
// getCellIDStringFromCoords returns the Excel format cell name that
// represents a pair of zero based cartesian coordinates.
func getCellIDStringFromCoords(x, y int) string {
letterPart := numericToLetters(x)
numericPart := y + 1
return fmt.Sprintf("%s%d", letterPart, numericPart)
}
// getMaxMinFromDimensionRef return the zero based cartesian maximum
// and minimum coordinates from the dimension reference embedded in a
// XLSX worksheet. For example, the dimension reference "A1:B2"
// returns "0,0", "1,1".
func getMaxMinFromDimensionRef(ref string) (minx, miny, maxx, maxy int, err error) {
var parts []string
parts = strings.Split(ref, ":")
minx, miny, err = getCoordsFromCellIDString(parts[0])
if err != nil {
return -1, -1, -1, -1, err
}
if len(parts) == 1 {
maxx, maxy = minx, miny
return
}
maxx, maxy, err = getCoordsFromCellIDString(parts[1])
if err != nil {
return -1, -1, -1, -1, err
}
return
}
// calculateMaxMinFromWorkSheet works out the dimensions of a spreadsheet
// that doesn't have a DimensionRef set. The only case currently
// known where this is true is with XLSX exported from Google Docs.
func calculateMaxMinFromWorksheet(worksheet *xlsxWorksheet) (minx, miny, maxx, maxy int, err error) {
// Note, this method could be very slow for large spreadsheets.
var x, y int
var maxVal int
maxVal = int(^uint(0) >> 1)
minx = maxVal
miny = maxVal
maxy = 0
maxx = 0
for _, row := range worksheet.SheetData.Row {
for _, cell := range row.C {
x, y, err = getCoordsFromCellIDString(cell.R)
if err != nil {
return -1, -1, -1, -1, err
}
if x < minx {
minx = x
}
if x > maxx {
maxx = x
}
if y < miny {
miny = y
}
if y > maxy {
maxy = y
}
}
}
if minx == maxVal {
minx = 0
}
if miny == maxVal {
miny = 0
}
return
}
// makeRowFromSpan will, when given a span expressed as a string,
// return an empty Row large enough to encompass that span and
// populate it with empty cells. All rows start from cell 1 -
// regardless of the lower bound of the span.
func makeRowFromSpan(spans string) *Row {
var error error
var upper int
var row *Row
var cell *Cell
row = new(Row)
_, upper, error = getRangeFromString(spans)
if error != nil {
panic(error)
}
error = nil
row.Cells = make([]*Cell, upper)
for i := 0; i < upper; i++ {
cell = new(Cell)
cell.Value = ""
row.Cells[i] = cell
}
return row
}
// makeRowFromRaw returns the Row representation of the xlsxRow.
func makeRowFromRaw(rawrow xlsxRow) *Row {
var upper int
var row *Row
var cell *Cell
row = new(Row)
upper = -1
for _, rawcell := range rawrow.C {
if rawcell.R != "" {
x, _, error := getCoordsFromCellIDString(rawcell.R)
if error != nil {
panic(fmt.Sprintf("Invalid Cell Coord, %s\n", rawcell.R))
}
if x > upper {
upper = x
}
continue
}
upper++
}
upper++
row.Cells = make([]*Cell, upper)
for i := 0; i < upper; i++ {
cell = new(Cell)
cell.Value = ""
row.Cells[i] = cell
}
return row
}
func makeEmptyRow() *Row {
row := new(Row)
row.Cells = make([]*Cell, 0)
return row
}
// fillCellData attempts to extract a valid value, usable in
// CSV form from the raw cell value. Note - this is not actually
// general enough - we should support retaining tabs and newlines.
func fillCellData(rawcell xlsxC, reftable *RefTable, cell *Cell) {
var data string = rawcell.V
if len(data) > 0 {
vval := strings.Trim(data, " \t\n\r")
switch rawcell.T {
case "s": // Shared String
ref, error := strconv.Atoi(vval)
if error != nil {
panic(error)
}
cell.Value = reftable.ResolveSharedString(ref)
cell.cellType = CellTypeString
case "b": // Boolean
cell.Value = vval
cell.cellType = CellTypeBool
case "e": // Error
cell.Value = vval
cell.formula = strings.Trim(rawcell.F, " \t\n\r")
cell.cellType = CellTypeError
default:
if len(rawcell.F) == 0 {
// Numeric
cell.Value = vval
cell.cellType = CellTypeNumeric
} else {
// Formula
cell.Value = vval
cell.formula = strings.Trim(rawcell.F, " \t\n\r")
cell.cellType = CellTypeFormula
}
}
}
}
// readRowsFromSheet is an internal helper function that extracts the
// rows from a XSLXWorksheet, populates them with Cells and resolves
// the value references from the reference table and stores them in
// the rows and columns.
func readRowsFromSheet(Worksheet *xlsxWorksheet, file *File) ([]*Row, []*Col, int, int) {
var rows []*Row
var cols []*Col
var row *Row
var minCol, maxCol, minRow, maxRow, colCount, rowCount int
var reftable *RefTable
var err error
var insertRowIndex, insertColIndex int
if len(Worksheet.SheetData.Row) == 0 {
return nil, nil, 0, 0
}
reftable = file.referenceTable
if len(Worksheet.Dimension.Ref) > 0 {
minCol, minRow, maxCol, maxRow, err = getMaxMinFromDimensionRef(Worksheet.Dimension.Ref)
} else {
minCol, minRow, maxCol, maxRow, err = calculateMaxMinFromWorksheet(Worksheet)
}
if err != nil {
panic(err.Error())
}
rowCount = maxRow + 1
colCount = maxCol + 1
rows = make([]*Row, rowCount)
cols = make([]*Col, colCount)
insertRowIndex = minRow
// Columns can apply to a range, for convenience we expand the
// ranges out into individual column definitions.
for _, rawcol := range Worksheet.Cols.Col {
// Note, below, that sometimes column definitions can
// exist outside the defined dimensions of the
// spreadsheet - we deliberately exclude these
// columns.
for i := rawcol.Min; i <= rawcol.Max && i <= colCount; i++ {
cols[i-1] = &Col{
Min: rawcol.Min,
Max: rawcol.Max,
Width: rawcol.Width,
Cw: rawcol.Cw}
}
}
// insert leading empty rows that is in front of minRow
for rowIndex := 0; rowIndex < minRow; rowIndex++ {
rows[rowIndex] = makeEmptyRow()
}
for rowIndex := 0; rowIndex < len(Worksheet.SheetData.Row); rowIndex++ {
rawrow := Worksheet.SheetData.Row[rowIndex]
// Some spreadsheets will omit blank rows from the
// stored data
for rawrow.R > (insertRowIndex + 1) {
// Put an empty Row into the array
rows[insertRowIndex-minRow] = makeEmptyRow()
insertRowIndex++
}
// range is not empty and only one range exist
if len(rawrow.Spans) != 0 && strings.Count(rawrow.Spans, ":") == 1 {
row = makeRowFromSpan(rawrow.Spans)
} else {
row = makeRowFromRaw(rawrow)
}
row.Hidden = rawrow.Hidden
insertColIndex = minCol
for _, rawcell := range rawrow.C {
x, _, _ := getCoordsFromCellIDString(rawcell.R)
// Some spreadsheets will omit blank cells
// from the data.
for x > insertColIndex {
// Put an empty Cell into the array
row.Cells[insertColIndex-minCol] = new(Cell)
insertColIndex++
}
cellX := insertColIndex
cell := row.Cells[cellX]
fillCellData(rawcell, reftable, cell)
if file.styles != nil {
cell.style = file.styles.getStyle(rawcell.S)
cell.numFmt = file.styles.getNumberFormat(rawcell.S)
}
cell.date1904 = file.Date1904
cell.Hidden = rawrow.Hidden || (len(cols) > cellX && cell.Hidden)
insertColIndex++
}
if len(rows) > insertRowIndex {
rows[insertRowIndex] = row
}
insertRowIndex++
}
return rows, cols, colCount, rowCount
}
type indexedSheet struct {
Index int
Sheet *Sheet
Error error
}
// readSheetFromFile is the logic of converting a xlsxSheet struct
// into a Sheet struct. This work can be done in parallel and so
// readSheetsFromZipFile will spawn an instance of this function per
// sheet and get the results back on the provided channel.
func readSheetFromFile(sc chan *indexedSheet, index int, rsheet xlsxSheet, fi *File, sheetXMLMap map[string]string) {
result := &indexedSheet{Index: index, Sheet: nil, Error: nil}
worksheet, error := getWorksheetFromSheet(rsheet, fi.worksheets, sheetXMLMap)
if error != nil {
result.Error = error
sc <- result
return
}
sheet := new(Sheet)
sheet.File = fi
sheet.Rows, sheet.Cols, sheet.MaxCol, sheet.MaxRow = readRowsFromSheet(worksheet, fi)
sheet.Hidden = rsheet.State == sheetStateHidden || rsheet.State == sheetStateVeryHidden
result.Sheet = sheet
sc <- result
}
// readSheetsFromZipFile is an internal helper function that loops
// over the Worksheets defined in the XSLXWorkbook and loads them into
// Sheet objects stored in the Sheets slice of a xlsx.File struct.
func readSheetsFromZipFile(f *zip.File, file *File, sheetXMLMap map[string]string) (map[string]*Sheet, []*Sheet, error) {
var workbook *xlsxWorkbook
var err error
var rc io.ReadCloser
var decoder *xml.Decoder
var sheetCount int
workbook = new(xlsxWorkbook)
rc, err = f.Open()
if err != nil {
return nil, nil, err
}
decoder = xml.NewDecoder(rc)
err = decoder.Decode(workbook)
if err != nil {
return nil, nil, err
}
file.Date1904 = workbook.WorkbookPr.Date1904
sheetCount = len(workbook.Sheets.Sheet)
sheetsByName := make(map[string]*Sheet, sheetCount)
sheets := make([]*Sheet, sheetCount)
sheetChan := make(chan *indexedSheet, sheetCount)
defer close(sheetChan)
go func() {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("%v", e)
result := &indexedSheet{Index: -1, Sheet: nil, Error: err}
sheetChan <- result
}
}()
err = nil
for i, rawsheet := range workbook.Sheets.Sheet {
readSheetFromFile(sheetChan, i, rawsheet, file, sheetXMLMap)
}
}()
for j := 0; j < sheetCount; j++ {
sheet := <-sheetChan
if sheet.Error != nil {
return nil, nil, sheet.Error
}
sheetName := workbook.Sheets.Sheet[sheet.Index].Name
sheetsByName[sheetName] = sheet.Sheet
sheet.Sheet.Name = sheetName
sheets[sheet.Index] = sheet.Sheet
}
return sheetsByName, sheets, nil
}
// readSharedStringsFromZipFile() is an internal helper function to
// extract a reference table from the sharedStrings.xml file within
// the XLSX zip file.
func readSharedStringsFromZipFile(f *zip.File) (*RefTable, error) {
var sst *xlsxSST
var error error
var rc io.ReadCloser
var decoder *xml.Decoder
var reftable *RefTable
// In a file with no strings it's possible that
// sharedStrings.xml doesn't exist. In this case the value
// passed as f will be nil.
if f == nil {
return nil, nil
}
rc, error = f.Open()
if error != nil {
return nil, error
}
sst = new(xlsxSST)
decoder = xml.NewDecoder(rc)
error = decoder.Decode(sst)
if error != nil {
return nil, error
}
reftable = MakeSharedStringRefTable(sst)
return reftable, nil
}
// readStylesFromZipFile() is an internal helper function to
// extract a style table from the style.xml file within
// the XLSX zip file.
func readStylesFromZipFile(f *zip.File) (*xlsxStyleSheet, error) {
var style *xlsxStyleSheet
var error error
var rc io.ReadCloser
var decoder *xml.Decoder
rc, error = f.Open()
if error != nil {
return nil, error
}
style = newXlsxStyleSheet()
decoder = xml.NewDecoder(rc)
error = decoder.Decode(style)
if error != nil {
return nil, error
}
buildNumFmtRefTable(style)
return style, nil
}
func buildNumFmtRefTable(style *xlsxStyleSheet) {
for _, numFmt := range style.NumFmts.NumFmt {
// We do this for the side effect of populating the NumFmtRefTable.
style.addNumFmt(numFmt)
}
}
type WorkBookRels map[string]string
func (w *WorkBookRels) MakeXLSXWorkbookRels() xlsxWorkbookRels {
relCount := len(*w)
xWorkbookRels := xlsxWorkbookRels{}
xWorkbookRels.Relationships = make([]xlsxWorkbookRelation, relCount+3)
for k, v := range *w {
index, err := strconv.Atoi(k[3:])
if err != nil {
panic(err.Error())
}
xWorkbookRels.Relationships[index-1] = xlsxWorkbookRelation{
Id: k,
Target: v,
Type: "http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"}
}
relCount++
sheetId := fmt.Sprintf("rId%d", relCount)
xWorkbookRels.Relationships[relCount-1] = xlsxWorkbookRelation{
Id: sheetId,
Target: "sharedStrings.xml",
Type: "http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings"}
relCount++
sheetId = fmt.Sprintf("rId%d", relCount)
xWorkbookRels.Relationships[relCount-1] = xlsxWorkbookRelation{
Id: sheetId,
Target: "theme/theme1.xml",
Type: "http://schemas.openxmlformats.org/officeDocument/2006/relationships/theme"}
relCount++
sheetId = fmt.Sprintf("rId%d", relCount)
xWorkbookRels.Relationships[relCount-1] = xlsxWorkbookRelation{
Id: sheetId,
Target: "styles.xml",
Type: "http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"}
return xWorkbookRels
}
// readWorkbookRelationsFromZipFile is an internal helper function to
// extract a map of relationship ID strings to the name of the
// worksheet.xml file they refer to. The resulting map can be used to
// reliably derefence the worksheets in the XLSX file.
func readWorkbookRelationsFromZipFile(workbookRels *zip.File) (WorkBookRels, error) {
var sheetXMLMap WorkBookRels
var wbRelationships *xlsxWorkbookRels
var rc io.ReadCloser
var decoder *xml.Decoder
var err error
rc, err = workbookRels.Open()
if err != nil {
return nil, err
}
decoder = xml.NewDecoder(rc)
wbRelationships = new(xlsxWorkbookRels)
err = decoder.Decode(wbRelationships)
if err != nil {
return nil, err
}
sheetXMLMap = make(WorkBookRels)
for _, rel := range wbRelationships.Relationships {
if strings.HasSuffix(rel.Target, ".xml") && rel.Type == "http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" {
_, filename := path.Split(rel.Target)
sheetXMLMap[rel.Id] = strings.Replace(filename, ".xml", "", 1)
}
}
return sheetXMLMap, nil
}
// ReadZip() takes a pointer to a zip.ReadCloser and returns a
// xlsx.File struct populated with its contents. In most cases
// ReadZip is not used directly, but is called internally by OpenFile.
func ReadZip(f *zip.ReadCloser) (*File, error) {
defer f.Close()
return ReadZipReader(&f.Reader)
}
// ReadZipReader() can be used to read an XLSX in memory without
// touching the filesystem.
func ReadZipReader(r *zip.Reader) (*File, error) {
var err error
var file *File
var reftable *RefTable
var sharedStrings *zip.File
var sheetXMLMap map[string]string
var sheetsByName map[string]*Sheet
var sheets []*Sheet
var style *xlsxStyleSheet
var styles *zip.File
var v *zip.File
var workbook *zip.File
var workbookRels *zip.File
var worksheets map[string]*zip.File
file = NewFile()
// file.numFmtRefTable = make(map[int]xlsxNumFmt, 1)
worksheets = make(map[string]*zip.File, len(r.File))
for _, v = range r.File {
switch v.Name {
case "xl/sharedStrings.xml":
sharedStrings = v
case "xl/workbook.xml":
workbook = v
case "xl/_rels/workbook.xml.rels":
workbookRels = v
case "xl/styles.xml":
styles = v
default:
if len(v.Name) > 14 {
if v.Name[0:13] == "xl/worksheets" {
worksheets[v.Name[14:len(v.Name)-4]] = v
}
}
}
}
sheetXMLMap, err = readWorkbookRelationsFromZipFile(workbookRels)
if err != nil {
return nil, err
}
file.worksheets = worksheets
reftable, err = readSharedStringsFromZipFile(sharedStrings)
if err != nil {
return nil, err
}
file.referenceTable = reftable
if styles != nil {
style, err = readStylesFromZipFile(styles)
if err != nil {
return nil, err
}
file.styles = style
}
sheetsByName, sheets, err = readSheetsFromZipFile(workbook, file, sheetXMLMap)
if err != nil {
return nil, err
}
if sheets == nil {
readerErr := new(XLSXReaderError)
readerErr.Err = "No sheets found in XLSX File"
return nil, readerErr
}
file.Sheet = sheetsByName
file.Sheets = sheets
return file, nil
}