sheetjs/demos/altjs/SheetJSCore.swift

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#!/usr/bin/env xcrun swift
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/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
import JavaScriptCore;
class SheetJS {
var context: JSContext!;
var XLSX: JSValue!;
enum SJSError: Error {
case badJSContext;
};
func init_context() throws -> JSContext {
var context: JSContext!
do {
context = JSContext();
context.exceptionHandler = { ctx, X in if let e = X { print(e.toString()); }; }
var src = "var global = (function(){ return this; }).call(null);";
context.evaluateScript(src);
src = try String(contentsOfFile: "xlsx.swift.js");
context.evaluateScript(src);
if context != nil { return context!; }
} catch { print(error.localizedDescription); }
throw SheetJS.SJSError.badJSContext;
}
func version() throws -> String {
if let version = XLSX.objectForKeyedSubscript("version") { return version.toString(); }
throw SheetJS.SJSError.badJSContext;
}
func readFileToCSV(file: String) throws -> String {
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let data:String! = try String(contentsOfFile: file, encoding:String.Encoding.isoLatin1);
self.context.setObject(data, forKeyedSubscript:"payload" as (NSCopying & NSObjectProtocol)!);
let src = [
"var wb = XLSX.read(payload, {type:'binary'});",
"var ws = wb.Sheets[wb.SheetNames[0]];",
"var result = XLSX.utils.sheet_to_csv(ws);"
].joined(separator: "\n");
self.context.evaluateScript(src);
return context.objectForKeyedSubscript("result").toString();
}
init() throws {
do {
self.context = try init_context();
self.XLSX = context.objectForKeyedSubscript("XLSX");
if self.XLSX == nil {
throw SheetJS.SJSError.badJSContext;
}
} catch { print(error.localizedDescription); }
}
}
let sheetjs = try SheetJS();
try print(sheetjs.version());
try print(sheetjs.readFileToCSV(file:"sheetjs.xlsx"));
try print(sheetjs.readFileToCSV(file:"sheetjs.xlsb"));
try print(sheetjs.readFileToCSV(file:"sheetjs.xls"));
try print(sheetjs.readFileToCSV(file:"sheetjs.xml.xls"));