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/* xlsx.js (C) 2013-present  SheetJS -- http://sheetjs.com */import XLSX from 'xlsx';import React, { Component } from 'react';import {	AppRegistry,	StyleSheet,	Text,	View,	Button,	Alert,	Image,	ScrollView,	TouchableWithoutFeedback} from 'react-native';import { Table, Row, Rows, TableWrapper } from 'react-native-table-component';
// react-native-file-accessvar Base64 = function() {  var map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";  return {    encode: function(input) {      var o = "";      var c1 = 0, c2 = 0, c3 = 0, e1 = 0, e2 = 0, e3 = 0, e4 = 0;      for (var i = 0; i < input.length; ) {        c1 = input.charCodeAt(i++);        e1 = c1 >> 2;        c2 = input.charCodeAt(i++);        e2 = (c1 & 3) << 4 | c2 >> 4;        c3 = input.charCodeAt(i++);        e3 = (c2 & 15) << 2 | c3 >> 6;        e4 = c3 & 63;        if (isNaN(c2)) {          e3 = e4 = 64;        } else if (isNaN(c3)) {          e4 = 64;        }        o += map.charAt(e1) + map.charAt(e2) + map.charAt(e3) + map.charAt(e4);      }      return o;    },    decode: function(input) {      var o = "";      var c1 = 0, c2 = 0, c3 = 0, e1 = 0, e2 = 0, e3 = 0, e4 = 0;      input = input.replace(/[^\w\+\/\=]/g, "");      for (var i = 0; i < input.length; ) {        e1 = map.indexOf(input.charAt(i++));        e2 = map.indexOf(input.charAt(i++));        c1 = e1 << 2 | e2 >> 4;        o += String.fromCharCode(c1);        e3 = map.indexOf(input.charAt(i++));        c2 = (e2 & 15) << 4 | e3 >> 2;        if (e3 !== 64) {          o += String.fromCharCode(c2);        }        e4 = map.indexOf(input.charAt(i++));        c3 = (e3 & 3) << 6 | e4;        if (e4 !== 64) {          o += String.fromCharCode(c3);        }      }      return o;    }  };}();
import { Dirs, FileSystem } from 'react-native-file-access';const DDP = Dirs.DocumentDir + "/";const readFile = (path, enc) => FileSystem.readFile(path, "base64");const writeFile = (path, data, enc) => FileSystem.writeFile(path, data, "base64");const input = res => Base64.decode(res);const output = str => Base64.encode(str);
// react-native-fs/*import { writeFile, readFile, DocumentDirectoryPath } from 'react-native-fs';const DDP = DocumentDirectoryPath + "/";const input = res => res;const output = str => str;*/// react-native-fetch-blob/*import RNFetchBlob from 'react-native-fetch-blob';const { writeFile, readFile, dirs:{ DocumentDir } } = RNFetchBlob.fs;const DDP = DocumentDir + "/";const input = res => res.map(x => String.fromCharCode(x)).join("");const output = str => str.split("").map(x => x.charCodeAt(0));*/
const make_cols = refstr => Array.from({length: XLSX.utils.decode_range(refstr).e.c + 1}, (x,i) => XLSX.utils.encode_col(i));const make_width = refstr => Array.from({length: XLSX.utils.decode_range(refstr).e.c + 1}, () => 60);
export default class SheetJS extends Component {	constructor(props) {		super(props);		this.state = {			data: [[2,3,4],[3,4,5]],			widthArr: [60, 60, 60],			cols: make_cols("A1:C2")		};		this.importFile = this.importFile.bind(this);		this.exportFile = this.exportFile.bind(this);	};	importFile() {		Alert.alert("Rename file to sheetjs.xlsx", "Copy to " + DDP, [			{text: 'Cancel', onPress: () => {}, style: 'cancel' },			{text: 'Import', onPress: () => {				readFile(DDP + "sheetjs.xlsx", 'ascii').then((res) => {					/* parse file */					const wb = XLSX.read(input(res), {type:'binary'});
					/* convert first worksheet to AOA */					const wsname = wb.SheetNames[0];					const ws = wb.Sheets[wsname];					const data = XLSX.utils.sheet_to_json(ws, {header:1});
					/* update state */					this.setState({ data: data, cols: make_cols(ws['!ref']), widthArr: make_width(ws['!ref']) });				}).catch((err) => { Alert.alert("importFile Error", "Error " + err.message); });			}}		]);	}	exportFile() {		/* convert AOA back to worksheet */		const ws = XLSX.utils.aoa_to_sheet(this.state.data);
		/* build new workbook */		const wb = XLSX.utils.book_new();		XLSX.utils.book_append_sheet(wb, ws, "SheetJS");
		/* write file */		const wbout = XLSX.write(wb, {type:'binary', bookType:"xlsx"});		const file = DDP + "sheetjsw.xlsx";		writeFile(file, output(wbout), 'ascii').then((res) =>{				Alert.alert("exportFile success", "Exported to " + file);		}).catch((err) => { Alert.alert("exportFile Error", "Error " + err.message); });	};
	render() {		return (			<ScrollView contentContainerStyle={styles.container} vertical={true}>				<Text style={styles.welcome}> </Text>				<Text style={styles.welcome}>SheetJS React Native Demo</Text>				<Text style={styles.instructions}>Import Data</Text>				<Button onPress={this.importFile} title="Import data from a spreadsheet" color="#841584" />				<Text style={styles.instructions}>Export Data</Text>				<Button disabled={!this.state.data.length} onPress={this.exportFile} title="Export data to XLSX" color="#841584" />
				<Text style={styles.instructions}>Current Data</Text>
				<ScrollView style={styles.table} horizontal={true} >					<Table style={styles.table}>						<TableWrapper>							<Row data={this.state.cols} style={styles.thead} textStyle={styles.text} widthArr={this.state.widthArr}/>						</TableWrapper>						<TouchableWithoutFeedback>							<ScrollView vertical={true}>								<TableWrapper>									<Rows data={this.state.data} style={styles.tr} textStyle={styles.text} widthArr={this.state.widthArr}/>								</TableWrapper>							</ScrollView>						</TouchableWithoutFeedback>					</Table>				</ScrollView>			</ScrollView>		);	};};
const styles = StyleSheet.create({	container: { flex: 1, justifyContent: 'center', alignItems: 'center', backgroundColor: '#F5FCFF' },	welcome: { fontSize: 20, textAlign: 'center', margin: 10 },	instructions: { textAlign: 'center', color: '#333333', marginBottom: 5 },	thead: { height: 40, backgroundColor: '#f1f8ff' },	tr: { height: 30 },	text: { marginLeft: 5 },	table: { width: "100%" }});
AppRegistry.registerComponent('SheetJS', () => SheetJS);