26 lines
1.3 KiB
Markdown
26 lines
1.3 KiB
Markdown
# JScript
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**NOTE: This had nothing to do with Microsoft's dialect of EcmaScript**
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**WARNING: Currently, this code is undocumented. Proceed with caution and a psychiatrist.**
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JScript is an engine, capable of running EcmaScript 5, written entirely in Java. This engine has been developed with the goal of being easy to integrate with your preexisting codebase, **THE GOAL OF THIS ENGINE IS NOT PERFORMANCE**. My crude experiments show that this engine is 50x-100x slower than V8, which, although bad, is acceptable for most simple scripting purposes. Note that although the codebase has a Main class, this isn't meant to be a standalone program, but instead a library for running JavaScript code.
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## Example
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The following is going to execute a simple javascript statement:
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```java
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var engine = new Engine();
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// Initialize a standard environment, with implementations of most basic standard libraries (Object, Array, Symbol, etc.)
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var env = Internals.apply(new Environment());
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// Queue code to load internal libraries and start engine
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var awaitable = engine.pushMsg(false, env, new Filename("tmp", "eval"), "10 + Math.sqrt(5 / 3)", null);
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// Run the engine on the same thread, until the event loop runs empty
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engine.run(true);
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// Get our result
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System.out.println(awaitable.await());
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```
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