com.theoryinpractise.coffeescript.CoffeeScriptCompiler Maven / Gradle / Ivy
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A Maven 2.0 plugin for compiling coffeescript into javascript
package com.theoryinpractise.coffeescript;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.JavaScriptException;
import org.mozilla.javascript.NativeObject;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.commonjs.module.Require;
import org.mozilla.javascript.commonjs.module.provider.StrongCachingModuleScriptProvider;
import org.mozilla.javascript.commonjs.module.provider.UrlModuleSourceProvider;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collections;
/**
* Copyright 2011 Mark Derricutt.
*
* Contributing authors:
* Daniel Bower
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*
* Wrapper around the coffee-script compiler from https://github.com/jashkenas/coffee-script/
*/
public class CoffeeScriptCompiler {
private final Scriptable globalScope;
private String version;
private Scriptable coffeeScript;
public CoffeeScriptCompiler(String version) {
this.version = version;
try {
Context context = createContext();
globalScope = context.initStandardObjects();
final Require require = getSandboxedRequire(context, globalScope, true);
coffeeScript = require.requireMain(context, "coffee-script");
} catch (Exception e1) {
throw new CoffeeScriptException("Unable to load the coffeeScript compiler into Rhino", e1);
} finally {
Context.exit();
}
}
public CompileResult compile(String coffeeScriptSource, String sourceName, boolean bare, SourceMap map, boolean header, boolean literate) {
Context context = Context.enter();
try {
Scriptable compileScope = context.newObject(coffeeScript);
compileScope.setParentScope(coffeeScript);
compileScope.put("coffeeScript", compileScope, coffeeScriptSource);
try {
boolean useMap = map != SourceMap.NONE;
String options = String.format("{bare: %s, sourceMap: %s, literate: %s, header: %s, filename: '%s'}", bare, useMap, literate, header, sourceName);
Object result = context.evaluateString(
compileScope,
String.format("compile(coffeeScript, %s);", options),
sourceName, 0, null);
if (map == SourceMap.NONE) {
return new CompileResult((String) result, null);
} else {
NativeObject nativeObject = (NativeObject) result;
String js = nativeObject.get("js").toString();
String sourceMap;
try {
ObjectMapper objectMapper = new ObjectMapper();
sourceMap = objectMapper.writeValueAsString(nativeObject.get("v3SourceMap"));
} catch (Exception e) {
sourceMap = null;
}
return new CompileResult(js, sourceMap);
}
} catch (JavaScriptException e) {
throw new CoffeeScriptException(e.getMessage(), e);
}
} finally {
Context.exit();
}
}
private Context createContext() {
Context context = Context.enter();
context.setOptimizationLevel(9); // Enable optimization
return context;
}
private Require getSandboxedRequire(Context cx, Scriptable scope, boolean sandboxed) throws URISyntaxException {
return new Require(cx, cx.initStandardObjects(),
new StrongCachingModuleScriptProvider(
new UrlModuleSourceProvider(Collections.singleton(
getDirectory()), null)), null, null, sandboxed);
}
private URI getDirectory() throws URISyntaxException {
final String resourcePath = String.format("/coffee-script-%s/", version);
return getClass().getResource(resourcePath).toURI();
}
public static enum SourceMap {NONE, V3}
}
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