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assets: add a replace processor fix jooby-project#1091 
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‎doc/available-asset-procesors.md‎

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* [uglify](https://github.com/jooby-project/jooby/tree/master/jooby-assets-uglify): uglify.js optimizer.
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* [replace](https://github.com/jooby-project/jooby/tree/master/jooby-assets-replace): replace strings in files while bundling them.
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* [requirejs](https://github.com/jooby-project/jooby/tree/master/jooby-assets-requirejs): r.js optimizer.
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* [yui-js](https://github.com/jooby-project/jooby/tree/master/jooby-assets-yui-compressor#yui-js): YUI JS optimizer.

‎doc/doc/assets-replace/assets-replace.md‎

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# props
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Replace strings in files while bundling them.
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{{assets-require.md}}
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## usage
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```
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assets {
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fileset {
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home: ...
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}
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pipeline {
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dist: [replace]
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}
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replace {
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process.env.NODE_ENV: "\"production\""
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"\"development\"": "\"production\""
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}
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}
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```
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# see also
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{{available-asset-procesors.md}}

‎modules/jooby-assets/src/main/java/org/jooby/assets/AssetOptions.java‎

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*/
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package org.jooby.assets;
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import static java.util.Objects.requireNonNull;
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import java.util.List;
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import java.util.Map;
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import org.jooby.Route;
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import org.jooby.internal.RoutePattern;
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import com.google.common.collect.ImmutableList;
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import com.typesafe.config.Config;
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import com.typesafe.config.ConfigFactory;
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import com.typesafe.config.ConfigValueFactory;
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import static java.util.Objects.requireNonNull;
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import org.jooby.Route;
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import org.jooby.internal.RoutePattern;
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import java.util.List;
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import java.util.Map;
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/**
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* Base class for {@link AssetProcessor} and {@link AssetAggregator}.
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*/
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public class AssetOptions {
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private Config options = ConfigFactory.empty();
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protected Config options = ConfigFactory.empty();
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public AssetOptions set(final String name, final Object value) {
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requireNonNull(name, "Option's name is required.");

‎modules/jooby-assets/src/main/java/org/jooby/assets/Replace.java‎

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package org.jooby.assets;
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import com.typesafe.config.Config;
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import org.jooby.MediaType;
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import java.util.LinkedHashMap;
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import java.util.Map;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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/**
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* <h1>replace</h1>
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* <p>
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* Replace strings in files while bundling them.
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* </p>
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*
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* <h2>usage</h2>
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* <pre>
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* assets {
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* fileset {
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* home: ...
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* }
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*
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* pipeline {
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* dist: [replace]
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* }
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*
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* replace {
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* process.env.NODE_ENV: "\"production\""
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* "\"development\"": "\"production\""
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* }
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* }
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* </pre>
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*
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* @author edgar
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*/
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public class Replace extends AssetProcessor {
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@Override public boolean matches(MediaType type) {
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return true;
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}
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@Override public String process(String filename, String source, Config conf, ClassLoader loader)
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throws Exception {
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Map<String, String> options = new LinkedHashMap<>();
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StringBuilder keys = new StringBuilder();
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this.options.withoutPath("excludes").entrySet().forEach(e -> {
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String key = e.getKey()
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/** Replace \" generated by .conf format: */
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.replace("\\\"", "");
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if (Character.isJavaIdentifierStart(key.charAt(0))) {
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keys.append("(\\b").append(key).append("\\b)");
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} else {
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keys.append("(").append(key).append(")");
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}
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options.put(key, e.getValue().unwrapped().toString());
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keys.append("|");
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});
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if (keys.length() > 0) {
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keys.setLength(keys.length() - 1);
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Pattern pattern = Pattern.compile(keys.toString());
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StringBuffer sb = new StringBuffer();
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Matcher matcher = pattern.matcher(source);
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while (matcher.find()) {
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String key = matcher.group();
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String value = options.get(key);
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matcher.appendReplacement(sb, value);
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}
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matcher.appendTail(sb);
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return sb.toString();
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}
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return source;
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}
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}

‎modules/jooby-assets/src/test/java/org/jooby/assets/ReplaceTest.java‎

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package org.jooby.assets;
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import com.typesafe.config.Config;
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import com.typesafe.config.ConfigFactory;
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import static org.junit.Assert.assertEquals;
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import org.junit.Test;
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public class ReplaceTest {
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@Test
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public void replaceProcessEnvNODE_ENV() throws Exception {
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assertEquals("if (\"production\" === \"development\") {\n"
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+ " console.log('development only')\n"
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+ "}\nconsole.log(headprocess.env.NODE_ENVtail)",
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new Replace()
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.set(conf("env"))
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.process("/index.js", "if (process.env.NODE_ENV === \"development\") {\n"
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+ " console.log('development only')\n"
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+ "}\nconsole.log(headprocess.env.NODE_ENVtail)",
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ConfigFactory.empty()));
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}
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@Test
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public void replaceString() throws Exception {
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assertEquals("if (\"production\" !== \"production\") {\n"
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+ " console.log('development only')\n"
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+ "}\n",
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new Replace()
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.set(conf("quotes"))
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.process("/index.js", "if (\"production\" !== \"development\") {\n"
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+ " console.log('development only')\n"
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+ "}\n",
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ConfigFactory.empty()));
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}
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@Test
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public void replaceMultiString() throws Exception {
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assertEquals("if (\"production\" !== \"production\") {\n"
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+ " console.log('development only')\n"
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+ "}\n",
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new Replace()
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.set(conf("multi"))
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.process("/index.js", "if (\"production\" !== \"development\") {\n"
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+ " console.log('development only')\n"
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+ "}\n",
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ConfigFactory.empty()));
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}
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private Config conf(String path) {
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return ConfigFactory.parseResources("replace.conf").getConfig(path);
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}
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}

‎modules/jooby-assets/src/test/resources/replace.conf‎

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env {
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process.env.NODE_ENV: "\"production\""
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}
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quotes {
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"\"development\"": "\"production\""
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}
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multi {
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process.env.NODE_ENV: "\"production\""
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"\"development\"": "\"production\""
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}

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