/
FreshMarkStep.java
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/
FreshMarkStep.java
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/*
* Copyright 2016 DiffPlug
*
* 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.
*/
package com.github.autostyle.markdown;
import static com.github.autostyle.markdown.LibMarkdownPreconditions.requireKeysAndValuesNonNull;
import com.github.autostyle.FormatterFunc;
import com.github.autostyle.FormatterStep;
import com.github.autostyle.JarState;
import com.github.autostyle.Provisioner;
import com.github.autostyle.ThrowingEx.Supplier;
import java.io.Serializable;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.NavigableMap;
import java.util.Objects;
import java.util.TreeMap;
import java.util.function.Consumer;
import java.util.logging.Logger;
import javax.script.ScriptEngineManager;
/** A step for [FreshMark](https://github.com/diffplug/freshmark). */
public class FreshMarkStep {
// prevent direct instantiation
private FreshMarkStep() {}
private static final String DEFAULT_VERSION = "1.3.1";
private static final String NAME = "freshmark";
private static final String MAVEN_COORDINATE = "com.diffplug.freshmark:freshmark:";
private static final String NASHORN_MAVEN_COORDINATE = "org.openjdk.nashorn:nashorn-core:";
private static final String NASHORN_VERSION = "15.4";
private static final String FORMATTER_CLASS = "com.diffplug.freshmark.FreshMark";
private static final String FORMATTER_METHOD = "compile";
/** Creates a formatter step for the given version and settings file. */
public static FormatterStep create(Provisioner provisioner, Supplier<Map<String, ?>> properties) {
return create(defaultVersion(), properties, provisioner);
}
static class NashornInfo {
final static boolean HAS_NASHORN = new ScriptEngineManager().getEngineByName("nashorn") != null;
}
/** Creates a formatter step for the given version and settings file. */
public static FormatterStep create(String version, Supplier<Map<String, ?>> properties, Provisioner provisioner) {
Objects.requireNonNull(version, "version");
Objects.requireNonNull(properties, "properties");
Objects.requireNonNull(provisioner, "provisioner");
List<String> mavenCoordinates = new ArrayList<>();
mavenCoordinates.add(MAVEN_COORDINATE + version);
if (!NashornInfo.HAS_NASHORN) {
mavenCoordinates.add("com.diffplug.jscriptbox:jscriptbox:3.0.1");
mavenCoordinates.add(NASHORN_MAVEN_COORDINATE + NASHORN_VERSION);
}
return FormatterStep.createLazy(NAME,
() -> new State(JarState.from(mavenCoordinates, provisioner), properties.get()),
State::createFormat);
}
public static String defaultVersion() {
return DEFAULT_VERSION;
}
private static class State implements Serializable {
private static final long serialVersionUID = 1L;
/** The jar that contains the eclipse formatter. */
final JarState jarState;
final NavigableMap<String, ?> properties;
State(JarState jarState, Map<String, ?> properties) {
this.jarState = jarState;
// because equality is computed based on serialization, it's important to order the properties
// before writing them
this.properties = new TreeMap<>(properties);
requireKeysAndValuesNonNull(this.properties);
}
FormatterFunc createFormat() throws Exception {
Logger logger = Logger.getLogger(FreshMarkStep.class.getName());
Consumer<String> loggingStream = logger::warning;
ClassLoader classLoader = jarState.getClassLoader();
// instantiate the formatter and get its format method
Class<?> formatterClazz = classLoader.loadClass(FORMATTER_CLASS);
Object formatter = formatterClazz.getConstructor(Map.class, Consumer.class).newInstance(properties, loggingStream);
Method method = formatterClazz.getMethod(FORMATTER_METHOD, String.class);
return input -> {
try {
return (String) method.invoke(formatter, input);
} catch (InvocationTargetException e) {
throw e.getCause();
}
};
}
}
}