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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,186 +1,7 @@ | ||
| # Other JS Engines and Deployments | ||
|
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| There are many JS engines and deployments outside of web browsers. NodeJS is the | ||
| most popular deployment, but there are many others for special use cases. Some | ||
| optimize for low overhead and others optimize for ease of embedding within other | ||
| applications. Since it was designed for ES3 engines, the library can be used in | ||
| those settings! This demo tries to demonstrate a few alternative deployments. | ||
| [The new demo](https://docs.sheetjs.com/docs/getting-started/demos/engines) | ||
| includes more detailed instructions and more JS engines. | ||
|
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| Some engines provide no default global object. To create a global reference: | ||
|
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| ```js | ||
| var global = (function(){ return this; }).call(null); | ||
| ``` | ||
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|
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| ## Swift + JavaScriptCore | ||
|
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| iOS and OSX ship with the JavaScriptCore framework for running JS scripts from | ||
| Swift and Objective-C. Hybrid function invocation is tricky, but explicit data | ||
| passing is straightforward. The demo shows a standalone example for OSX. For | ||
| playgrounds, the library should be copied to shared playground data directory | ||
| (usually `~/Documents/Shared Playground Data`): | ||
|
|
||
| ```swift | ||
| /* This only works in a playground, see SheetJSCore.swift for standalone use */ | ||
| import JavaScriptCore; | ||
| import PlaygroundSupport; | ||
|
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| /* build path variable for the library */ | ||
| let shared_dir = PlaygroundSupport.playgroundSharedDataDirectory; | ||
| let lib_path = shared_dir.appendingPathComponent("xlsx.full.min.js"); | ||
|
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| /* prepare JS context */ | ||
| var context: JSContext! = JSContext(); | ||
| var src = "var global = (function(){ return this; }).call(null);"; | ||
| context.evaluateScript(src); | ||
|
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| /* load library */ | ||
| var lib = try? String(contentsOf: lib_path); | ||
| context.evaluateScript(lib); | ||
| let XLSX: JSValue! = context.objectForKeyedSubscript("XLSX"); | ||
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| /* to verify the library was loaded, get the version string */ | ||
| let XLSXversion: JSValue! = XLSX.objectForKeyedSubscript("version") | ||
| var version = XLSXversion.toString(); | ||
| ``` | ||
|
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| Binary strings can be passed back and forth using `String.Encoding.isoLatin1`: | ||
|
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| ```swift | ||
| /* parse sheetjs.xls */ | ||
| let file_path = shared_dir.appendingPathComponent("sheetjs.xls"); | ||
| let data: String! = try String(contentsOf: file_path, encoding: String.Encoding.isoLatin1); | ||
| context.setObject(data, forKeyedSubscript: "payload" as (NSCopying & NSObjectProtocol)); | ||
| src = "var wb = XLSX.read(payload, {type:'binary'});"; | ||
| context.evaluateScript(src); | ||
|
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| /* write to sheetjsw.xlsx */ | ||
| let out_path = shared_dir.appendingPathComponent("sheetjsw.xlsx"); | ||
| src = "var out = XLSX.write(wb, {type:'binary', bookType:'xlsx'})"; | ||
| context.evaluateScript(src); | ||
| let outvalue: JSValue! = context.objectForKeyedSubscript("out"); | ||
| var out: String! = outvalue.toString(); | ||
| try? out.write(to: out_path, atomically: false, encoding: String.Encoding.isoLatin1); | ||
| ``` | ||
|
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|
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| ## Nashorn | ||
|
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| Nashorn ships with Java 8. It includes a command-line tool `jjs` for running JS | ||
| scripts. It is somewhat limited but does offer access to the full Java runtime. | ||
|
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| The `load` function in `jjs` can load the minified source directly: | ||
|
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| ```js | ||
| var global = (function(){ return this; }).call(null); | ||
| load('xlsx.full.min.js'); | ||
| ``` | ||
|
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| The Java `nio` API provides the `Files.readAllBytes` method to read a file into | ||
| a byte array. To use in `XLSX.read`, the demo copies the bytes into a plain JS | ||
| array and calls `XLSX.read` with type `"array"`. | ||
|
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|
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| ## Rhino | ||
|
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| [Rhino](http://www.mozilla.org/rhino) is an ES3+ engine written in Java. The | ||
| `SheetJSRhino` class and `com.sheetjs` package show a complete JAR deployment, | ||
| including the full XLSX source. | ||
|
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| Due to code generation errors, optimization must be turned off: | ||
|
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| ```java | ||
| Context context = Context.enter(); | ||
| context.setOptimizationLevel(-1); | ||
| ``` | ||
|
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|
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| ## ChakraCore | ||
|
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| ChakraCore is an embeddable JS engine written in C++. The library and binary | ||
| distributions include a command-line tool `chakra` for running JS scripts. | ||
|
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| The simplest way to interact with the engine is to pass Base64 strings. The make | ||
| target builds a very simple payload with the data. | ||
|
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|
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| ## Duktape | ||
|
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| [Duktape](http://duktape.org/) is an embeddable JS engine written in C. The | ||
| amalgamation makes integration extremely simple! It supports `Buffer` natively | ||
| but should be sliced before processing: | ||
|
|
||
| ```C | ||
| /* parse a C char array as a workbook object */ | ||
| duk_push_external_buffer(ctx); | ||
| duk_config_buffer(ctx, -1, buf, len); | ||
| duk_put_global_string(ctx, "buf"); | ||
| duk_eval_string_noresult("workbook = XLSX.read(buf.slice(0, buf.length), {type:'buffer'});"); | ||
|
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| /* write a workbook object to a C char array */ | ||
| duk_eval_string(ctx, "XLSX.write(workbook, {type:'array', bookType:'xlsx'})"); | ||
| duk_size_t sz; | ||
| char *buf = (char *)duk_get_buffer_data(ctx, -1, sz); | ||
| duk_pop(ctx); | ||
| ``` | ||
| ## QuickJS | ||
| QuickJS is an embeddable JS engine written in C. It provides a separate set of | ||
| functions for interacting with the filesystem and the global object. It can run | ||
| the browser dist build. | ||
| The `global` object is available as `std.global`. To make it visible to the | ||
| loader, create a reference to itself: | ||
| ```js | ||
| std.global.global = std.global; | ||
| std.loadScript("xlsx.full.min.js"); | ||
| ``` | ||
|
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| The filesystem interaction mirrors POSIX, including separate allocations: | ||
|
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||
| ```js | ||
| /* read file */ | ||
| var rh = std.open(filename, "rb"); rh.seek(0, std.SEEK_END); | ||
| var sz = rh.tell(); rh.seek(); | ||
| var ab = new ArrayBuffer(sz); rh.read(ab, 0, sz); rh.close(); | ||
| var wb = XLSX.read(ab, {type: 'array'}); | ||
|
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| /* write file */ | ||
| var ab = XLSX.write(wb, {type: 'array'}); | ||
| var wh = std.open("sheetjs.qjs.xlsx", "wb"); | ||
| wh.write(out, 0, ab.byteLength); wh.close(); | ||
| ``` | ||
|
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| ## Goja | ||
|
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| Goja is a pure Go implementation of ECMAScript 5. `[]byte` should be converted | ||
| to a binary string in the engine: | ||
|
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| ```go | ||
| /* read file */ | ||
| data, _ := ioutil.ReadFile("sheetjs.xlsx") | ||
|
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| /* load into engine */ | ||
| vm.Set("buf", data) | ||
|
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| /* convert to binary string */ | ||
| _, _ = vm.RunString("var bstr = ''; for(var i = 0; i < buf.length; ++i) bstr += String.fromCharCode(buf[i]);") | ||
|
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| /* parse */ | ||
| wb, _ = vm.RunString("wb = XLSX.read(bstr, {type:'binary', cellNF:true});") | ||
| ``` | ||
|
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| On the write side, `"base64"` strings can be decoded in Go: | ||
|
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| ```go | ||
| b64str, _ := vm.RunString("XLSX.write(wb, {type:'base64', bookType:'xlsx'})") | ||
| buf, _ := base64.StdEncoding.DecodeString(b64str.String()) | ||
| _ = ioutil.WriteFile("sheetjs.xlsx", buf, 0644) | ||
| ``` | ||
|
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||
| [](https://github.com/SheetJS/js-xlsx) |
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