forked from p30928647/excelize
107 lines
2.3 KiB
Go
107 lines
2.3 KiB
Go
package excelize
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import (
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"archive/zip"
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"bytes"
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"io"
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"log"
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"math"
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)
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// ReadZipReader can be used to read an XLSX in memory without touching the
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// filesystem.
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func ReadZipReader(r *zip.Reader) (map[string]string, int, error) {
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fileList := make(map[string]string)
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worksheets := 0
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for _, v := range r.File {
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fileList[v.Name] = readFile(v)
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if len(v.Name) > 18 {
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if v.Name[0:19] == "xl/worksheets/sheet" {
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worksheets++
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}
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}
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}
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return fileList, worksheets, nil
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}
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// readXML provides function to read XML content as string.
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func (f *File) readXML(name string) string {
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if content, ok := f.XLSX[name]; ok {
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return content
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}
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return ""
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}
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// saveFileList provides function to update given file content in file list of
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// XLSX.
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func (f *File) saveFileList(name, content string) {
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f.XLSX[name] = XMLHeader + content
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}
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// Read file content as string in a archive file.
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func readFile(file *zip.File) string {
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rc, err := file.Open()
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if err != nil {
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log.Fatal(err)
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}
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buff := bytes.NewBuffer(nil)
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io.Copy(buff, rc)
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rc.Close()
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return string(buff.Bytes())
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}
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// ToAlphaString provides function to convert integer to Excel sheet column
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// title. For example convert 36 to column title AK:
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//
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// excelize.ToAlphaString(36)
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//
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func ToAlphaString(value int) string {
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if value < 0 {
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return ""
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}
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var ans string
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i := value + 1
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for i > 0 {
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ans = string((i-1)%26+65) + ans
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i = (i - 1) / 26
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}
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return ans
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}
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// TitleToNumber provides function to convert Excel sheet column title to int
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// (this function doesn't do value check currently). For example convert AK to
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// column title 36:
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//
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// excelize.TitleToNumber("AK")
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//
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func TitleToNumber(s string) int {
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weight := 0.0
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sum := 0
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for i := len(s) - 1; i >= 0; i-- {
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sum = sum + (int(s[i])-int('A')+1)*int(math.Pow(26, weight))
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weight++
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}
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return sum - 1
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}
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// letterOnlyMapF is used in conjunction with strings.Map to return only the
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// characters A-Z and a-z in a string.
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func letterOnlyMapF(rune rune) rune {
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switch {
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case 'A' <= rune && rune <= 'Z':
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return rune
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case 'a' <= rune && rune <= 'z':
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return rune - 32
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}
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return -1
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}
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// intOnlyMapF is used in conjunction with strings.Map to return only the
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// numeric portions of a string.
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func intOnlyMapF(rune rune) rune {
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if rune >= 48 && rune < 58 {
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return rune
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}
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return -1
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}
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