xsheetjs/demos/altjs/goja.go

72 lines
1.8 KiB
Go

package main
import (
b64 "encoding/base64"
"fmt"
"os"
"io/ioutil"
"github.com/dop251/goja"
)
func safe_run_file(vm *goja.Runtime, file string) {
data, err := ioutil.ReadFile(file)
if err != nil { panic(err) }
src := string(data)
_, err = vm.RunString(src)
if err != nil { panic(err) }
}
func eval_string(vm *goja.Runtime, cmd string) goja.Value {
v, err := vm.RunString(cmd)
if err != nil { panic(err) }
return v
}
func write_type(vm *goja.Runtime, t string) {
/* due to some wonkiness with array passing, use base64 */
b64str := eval_string(vm, "XLSX.write(wb, {type:'base64', bookType:'" + t + "'})")
buf, err := b64.StdEncoding.DecodeString(b64str.String());
if err != nil { panic(err) }
err = ioutil.WriteFile("sheetjsg." + t, buf, 0644)
if err != nil { panic(err) }
}
func main() {
vm := goja.New()
/* initialize */
eval_string(vm, "if(typeof global == 'undefined') global = (function(){ return this; }).call(null);")
/* load library */
safe_run_file(vm, "shim.min.js")
safe_run_file(vm, "xlsx.full.min.js")
/* get version string */
v := eval_string(vm, "XLSX.version")
fmt.Printf("SheetJS library version %s\n", v)
/* read file */
data, err := ioutil.ReadFile(os.Args[1])
if err != nil { panic(err) }
vm.Set("buf", data)
fmt.Printf("Loaded file %s\n", os.Args[1])
/* parse workbook */
eval_string(vm, "var bstr = ''; for(var i = 0; i < buf.length; ++i) bstr += String.fromCharCode(buf[i]);")
eval_string(vm, "wb = XLSX.read(bstr, {type:'binary', cellNF:true});")
eval_string(vm, "ws = wb.Sheets[wb.SheetNames[0]]")
/* print CSV */
csv := eval_string(vm, "XLSX.utils.sheet_to_csv(ws)")
fmt.Printf("%s\n", csv)
/* change cell A1 to 3 */
eval_string(vm, "ws['A1'].v = 3; delete ws['A1'].w;")
/* write file */
//write_type(vm, "xlsb")
//write_type(vm, "xlsx")
write_type(vm, "xls")
write_type(vm, "csv")
}