xsheetjs/demos/altjs/SheetJSCore.swift

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2017-09-24 23:40:09 +00:00
/* xlsx.js (C) 2013-present SheetJS -- http://sheetjs.com */
import JavaScriptCore;
enum SJSError: Error {
case badJSContext;
case badJSWorkbook;
case badJSWorksheet;
};
class SJSWorksheet {
var context: JSContext!;
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var wb: JSValue; var ws: JSValue;
var idx: Int32;
func toCSV() throws -> String {
let XLSX: JSValue! = context.objectForKeyedSubscript("XLSX");
let utils: JSValue! = XLSX.objectForKeyedSubscript("utils");
let sheet_to_csv: JSValue! = utils.objectForKeyedSubscript("sheet_to_csv");
return sheet_to_csv.call(withArguments: [ws]).toString();
}
init(ctx: JSContext, workbook: JSValue, worksheet: JSValue, idx: Int32) throws {
self.context = ctx; self.wb = workbook; self.ws = worksheet; self.idx = idx;
}
}
class SJSWorkbook {
var context: JSContext!;
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var wb: JSValue; var SheetNames: JSValue; var Sheets: JSValue;
func getSheetAtIndex(idx: Int32) throws -> SJSWorksheet {
let SheetName: String = SheetNames.atIndex(Int(idx)).toString();
let ws: JSValue! = Sheets.objectForKeyedSubscript(SheetName);
return try SJSWorksheet(ctx: context, workbook: wb, worksheet: ws, idx: idx);
}
func writeBStr(bookType: String = "xlsx") throws -> String {
let XLSX: JSValue! = context.objectForKeyedSubscript("XLSX");
context.evaluateScript(String(format: "var writeopts = {type:'binary', bookType:'%@'}", bookType));
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let writeopts: JSValue = context.objectForKeyedSubscript("writeopts");
let writefunc: JSValue = XLSX.objectForKeyedSubscript("write");
return writefunc.call(withArguments: [wb, writeopts]).toString();
}
init(ctx: JSContext, wb: JSValue) throws {
self.context = ctx;
self.wb = wb;
self.SheetNames = wb.objectForKeyedSubscript("SheetNames");
self.Sheets = wb.objectForKeyedSubscript("Sheets");
}
}
class SheetJSCore {
var context: JSContext!;
var XLSX: JSValue!;
func init_context() throws -> JSContext {
var context: JSContext!
do {
context = JSContext();
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context.exceptionHandler = { _, X in if let e = X { print(e.toString()!); }; };
context.evaluateScript("var global = (function(){ return this; }).call(null);");
context.evaluateScript("if(typeof wbs == 'undefined') wbs = [];");
let src = try String(contentsOfFile: "xlsx.full.min.js");
context.evaluateScript(src);
if context != nil { return context!; }
} catch { print(error.localizedDescription); }
throw SJSError.badJSContext;
}
func version() throws -> String {
if let version = XLSX.objectForKeyedSubscript("version") { return version.toString(); }
throw SJSError.badJSContext;
}
func readFile(file: String) throws -> SJSWorkbook {
let data: String! = try String(contentsOfFile: file, encoding: String.Encoding.isoLatin1);
return try readBStr(data: data);
}
func readBStr(data: String) throws -> SJSWorkbook {
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context.setObject(data, forKeyedSubscript: "payload" as (NSCopying & NSObjectProtocol));
context.evaluateScript("var wb = XLSX.read(payload, {type:'binary'});");
let wb: JSValue! = context.objectForKeyedSubscript("wb");
if wb == nil { throw SJSError.badJSWorkbook; }
return try SJSWorkbook(ctx: context, wb: wb);
}
init() throws {
do {
self.context = try init_context();
self.XLSX = self.context.objectForKeyedSubscript("XLSX");
if self.XLSX == nil { throw SJSError.badJSContext; }
} catch { print(error.localizedDescription); }
}
}