com.google.dart.tools.core.html.DartHtmlScriptHelper.java Source code

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Here is the source code for com.google.dart.tools.core.html.DartHtmlScriptHelper.java

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/*
 * Copyright (c) 2012, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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.google.dart.tools.core.html;

import com.google.common.base.Charsets;
import com.google.common.io.Files;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * A utility class to pull Dart scripts out of an html file.
 */
public class DartHtmlScriptHelper {

    /**
     * Parse the given html file and return the content and location of the "application/dart"
     * scripts.
     * 
     * @param file
     * @return
     * @throws IOException
     */
    public static List<Token> getDartScripts(File file) throws IOException {
        return getDartScripts(Files.toString(file, Charsets.UTF_8));
    }

    /**
     * Parse the given html file and return the content and location of the "application/dart"
     * scripts.
     * 
     * @param file
     * @return
     * @throws IOException
     */
    public static List<Token> getDartScripts(String data) {
        HtmlParser parser = new HtmlParser(data);

        XmlDocument document = parser.parse();

        List<Token> scripts = new ArrayList<Token>();

        for (XmlNode child : document.getChildren()) {
            if (child instanceof XmlElement) {
                locateScripts((XmlElement) child, scripts);
            }
        }

        return scripts;
    }

    private static void locateScripts(XmlElement node, List<Token> scripts) {
        if ("script".equals(node.getLabel())) {
            String type = node.getAttributeString("type");

            if ("application/dart".equalsIgnoreCase(type)) {
                Token endToken = node.getEndToken();
                Token token = new Token(node.getContents(), endToken.getLocation() + 1, endToken.getLineNumber());
                scripts.add(token);
            }
        }

        for (XmlNode child : node.getChildren()) {
            if (child instanceof XmlElement) {
                locateScripts((XmlElement) child, scripts);
            }
        }
    }

}