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.. | ||
com/sheetjs | ||
.gitignore | ||
Makefile | ||
nashorn.js | ||
README.md | ||
SheetJSCore.swift | ||
SheetJSRhino.java | ||
skookum.js |
Other JS Engines and Deployments
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.
Some engines provide no default global object. To create a global reference:
var global = (function(){ return this; }).call(null);
Swift + JavaScriptCore
iOS and OSX ship with the JavaScriptCore framework, enabling easy JS access from Swift and Objective-C. Hybrid function invocation is tricky, but explicit data passing is straightforward.
Binary strings can be passed back and forth using String.Encoding.ascii
.
Nashorn
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.
jjs
does not provide a CommonJS require
implementation. This demo uses a
shim
and manually requires the library.
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"
.
Rhino
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.
Due to code generation errors, optimization must be disabled:
Context context = Context.enter();
context.setOptimizationLevel(-1);
duktape and skookum
Duktape is an embeddable JS engine written in C. The amalgamation makes integration extremely simple! Duktape understands the source code and can process binary strings out the box, but does not provide I/O or other standard library features.
To demonstrate compatibility with duktape, this demo uses the JS runtime from Skookum JS. Built upon the duktape engine, it adds a simple I/O interface to enable reading from files.