带有wro4j和Google Closure编译器的ECMASCRIPT 5 [英] ECMASCRIPT 5 with wro4j and Google Closure Compiler

问题描述

我们正在将wro4j与Google Closure和Maven结合使用，以最小化我们的JS.默认情况下，它不支持JS中的严格模式("use strict";)..只是将其剥离.我可以在pom.xml或其他地方进行任何配置以使其保留在use strict中吗?

We are using wro4j with Google Closure and Maven to minify our JS. By default it does not suport strict mode in the JS ("use strict";).. it just strips it out. Is there any configuration I can do in pom.xml or somewhere else to get it to leave use strict in there?

这是Google闭包编译器执行的配置:

This is the configuration for google closure complier to do it:

--language_in=ECMASCRIPT5_STRICT

不确定如何将其插入Wro4j.有什么想法吗?

Not sure how to plug that in to Wro4j. Any ideas?

推荐答案

在wro4j-maven-plugin 1.8中，它有些复杂，但还不错.

It's a bit more complicated in wro4j-maven-plugin 1.8, but not that bad.

您需要添加两个Java类.像这样首先覆盖GoogleClosureCompressorProcessor的newCompilerOptions:

You need to add two Java classes. First override newCompilerOptions of GoogleClosureCompressorProcessor like so:

package com.example.package.wro;

import com.google.javascript.jscomp.CheckLevel;
import com.google.javascript.jscomp.ClosureCodingConvention;
import com.google.javascript.jscomp.CompilerOptions;
import com.google.javascript.jscomp.DiagnosticGroups;
import java.nio.charset.Charset;
import org.apache.commons.lang3.CharEncoding;
import ro.isdc.wro.extensions.processor.js.GoogleClosureCompressorProcessor;

/**
 * Custom processor overriding `newCompilerOptions` to add custom compiler options.
 *
 * Original author: Alex Objelean.
 */
public class CustomGoogleClosureCompressorProcessor extends GoogleClosureCompressorProcessor {

    /**
     * Encoding to use.
     */
    public static final String ENCODING = CharEncoding.UTF_8;

    @Override
    protected CompilerOptions newCompilerOptions() {
        final CompilerOptions options = new CompilerOptions();

        // Set the language_in option on the Google Closure Compiler to prevent errors like:
        // "JSC_TRAILING_COMMA. Parse error. IE8 (and below)"
        options.setLanguageIn(CompilerOptions.LanguageMode.ECMASCRIPT5);

        /**
         * According to John Lenz from the Closure Compiler project, if you are using the Compiler API directly, you should
         * specify a CodingConvention. {@link http://code.google.com/p/wro4j/issues/detail?id=155}
         */
        options.setCodingConvention(new ClosureCodingConvention());
        // use the wro4j encoding by default
        //options.setOutputCharset(Charset.forName(getEncoding()));
        setEncoding(ENCODING);
        options.setOutputCharset(Charset.forName(ENCODING));
        // set it to warning, otherwise compiler will fail
        options.setWarningLevel(DiagnosticGroups.CHECK_VARIABLES, CheckLevel.WARNING);
        return options;
    }
}

您会注意到我已经注释掉了getEncoding行.这是因为它是私人的.我还添加了setEncoding以防万一.

You'll notice I've commented out the line getEncoding. This is because it's private. I also added setEncoding just in case.

然后我们需要自定义管理器:

Then we need the Custom manger:

package com.example.package.wro;

import ro.isdc.wro.manager.factory.standalone.DefaultStandaloneContextAwareManagerFactory;
import ro.isdc.wro.model.resource.processor.factory.ProcessorsFactory;
import ro.isdc.wro.model.resource.processor.factory.SimpleProcessorsFactory;

/**
 * Custom manger adding custom processor.
 */
public class CustomWroManagerFactory extends DefaultStandaloneContextAwareManagerFactory {

    @Override
    protected ProcessorsFactory newProcessorsFactory() {
        final SimpleProcessorsFactory factory = new SimpleProcessorsFactory();

        factory.addPreProcessor(
            new CustomGoogleClosureCompressorProcessor()
        );

        return factory;
    }
}

，然后在wroManagerFactory中的pom.xml中使用它.像这样:

And then use it in your pom.xml in wroManagerFactory. Something like so:

        <plugin>
            <groupId>ro.isdc.wro4j</groupId>
            <artifactId>wro4j-maven-plugin</artifactId>
            <version>1.8.0</version>
            <executions>
                <execution>
                    <phase>compile</phase>
                    <goals>
                        <goal>run</goal>
                    </goals>
                </execution>
            </executions>
            <!-- Google Closure Compiler -->
            <!-- http://www.gzfs020.com/using-google-closure-compiler-with-wro4j-maven-plugin.html -->
            <configuration>
                <contextFolder>${basedir}/src/main</contextFolder>
                <wroFile>${basedir}/src/main/config/wro.xml</wroFile>
                <destinationFolder>${project.build.directory}/${project.build.finalName}/min</destinationFolder>
                <!--
                <wroManagerFactory>ro.isdc.wro.extensions.manager.standalone.GoogleStandaloneManagerFactory</wroManagerFactory>
                -->
                <wroManagerFactory>com.example.package.wro.CustomWroManagerFactory</wroManagerFactory>
            </configuration>
        </plugin>

这篇关于带有wro4j和Google Closure编译器的ECMASCRIPT 5的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！