guru.nidi.graphviz.engine.AbstractJsGraphvizEngine Maven / Gradle / Ivy
/*
* Copyright © 2015 Stefan Niederhauser ([email protected])
*
* 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 guru.nidi.graphviz.engine;
import java.io.IOException;
import java.io.InputStream;
public abstract class AbstractJsGraphvizEngine extends AbstractGraphvizEngine {
public AbstractJsGraphvizEngine(boolean sync) {
super(sync);
}
@Override
public String execute(String src, Options options) {
return jsExecute(jsVizExec(src, options));
}
protected abstract String jsExecute(String jsCall);
protected String jsVizExec(String src, Options options) {
return src.startsWith("Viz(") ? src : ("Viz('" + jsEscape(src) + "'," + options.toJson(false) + ");");
}
protected String jsEscape(String js) {
return js.replace("\n", " ").replace("\\", "\\\\").replace("'", "\\'");
}
protected String jsVizCode(String version) throws IOException {
try (final InputStream in = getClass().getResourceAsStream("/viz-" + version + ".js")) {
return IoUtils.readStream(in);
}
}
protected String jsInitEnv() {
return "var $$prints=[], print=function(s){$$prints.push(s);};";
}
}