35 lines
1.3 KiB
Markdown
35 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 mostly 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.
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## Example
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The following will create a REPL using the engine as a backend. Not that this won't properly log errors. I recommend checking out the implementation in `Main.main`:
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```java
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var engine = new PolyfillEngine(new File("."));
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var in = new BufferedReader(new InputStreamReader(System.in));
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engine.start();
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while (true) {
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try {
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var raw = in.readLine();
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var res = engine.pushMsg(false, engine.global(), Map.of(), "<stdio>", raw, null).await();
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Values.printValue(engine.context(), res);
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System.out.println();
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}
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catch (EngineException e) {
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try {
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System.out.println("Uncaught " + e.toString(engine.context()));
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}
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catch (InterruptedException _e) { return; }
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}
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catch (IOException | InterruptedException e) { return; }
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}
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```
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