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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com *//* vim: set ts=2: */
import { Component } from '@angular/core';import { encoding } from '@nativescript/core/text';import { File, Folder, knownFolders, path } from '@nativescript/core/file-system';import { Dialogs } from '@nativescript/core';import { Page, GridLayout, WebView, DockLayout, Button } from '@nativescript/core';
import * as XLSX from './xlsx.full.min';
@Component({  selector: 'ns-app',  template: `  <Page>    <GridLayout rows="auto, *, auto">
      <!-- data converted to HTML and rendered in web view -->      <WebView row="1" src="{{html}}"></WebView>
      <DockLayout row="2" dock="bottom" stretchLastChild="false">        <Button text="Import File" (tap)="import()" style="padding: 10px"></Button>        <Button text="Export File" (tap)="export()" style="padding: 10px"></Button>      </DockLayout>    </GridLayout>  </Page>  `})
export class AppComponent {  html: string = "";  constructor() {    const ws = XLSX.utils.aoa_to_sheet([[1,2],[3,4]]);    this.html = XLSX.utils.sheet_to_html(ws);  };
  /* Import button */  async import() {    const filename: string = "SheetJSNS.csv";
    /* find appropriate path */    const target: Folder = knownFolders.documents() || knownFolders.ios.sharedPublic();    const url: string = path.normalize(target.path + "///" + filename);    const file: File = File.fromPath(url);
    try {      /* get binary string */      const bstr: string = await file.readText(encoding.ISO_8859_1);
      /* read workbook */      const wb = XLSX.read(bstr, { type: "binary" });
      /* grab first sheet */      const wsname: string = wb.SheetNames[0];      const ws = wb.Sheets[wsname];
      /* update table */      this.html = XLSX.utils.sheet_to_html(ws);      Dialogs.alert(`Attempting to read to ${filename} in ${url}`);    } catch(e) {      Dialogs.alert(e.message);    }  };
  /* Export button */  async export() {    const wb = XLSX.read(this.html, { type: "string" });    const filename: string = "SheetJSNS.csv";
    /* generate binary string */    const wbout: string = XLSX.write(wb, { bookType: 'csv', type: 'binary' });
    /* find appropriate path */    const target: Folder = knownFolders.documents() || knownFolders.ios.sharedPublic();    const url: string = path.normalize(target.path + "///" + filename);    const file: File = File.fromPath(url);
    /* attempt to save binary string to file */    await file.writeText(wbout, encoding.ISO_8859_1);    Dialogs.alert(`Wrote to ${filename} in ${url}`);  };}