intelligent.wiki.editor.core_impl.sweble.SwebleASTNode.java Source code

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Here is the source code for intelligent.wiki.editor.core_impl.sweble.SwebleASTNode.java

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/*
 * Copyright (C) 2016 Myroslav Rudnytskyi
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 */

package intelligent.wiki.editor.core_impl.sweble;

import intelligent.wiki.editor.core_api.ASTNode;
import intelligent.wiki.editor.core_api.ASTNodeID;
import intelligent.wiki.editor.core_api.ASTNodeType;
import intelligent.wiki.editor.core_api.MarkupText;
import intelligent.wiki.editor.core_impl.WikiMarkup;
import org.apache.commons.lang.StringEscapeUtils;
import org.sweble.wikitext.parser.nodes.WtNode;
import org.sweble.wikitext.parser.utils.WtPrettyPrinter;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Objects;

/**
 * Class represents every node in the article AST, wrapping
 * <a href=https://github.com/sweble/sweble-wikitext>Sweble library</a>
 * AST nodes. It is default implementation of {@link ASTNode}.
 *
 * @author Myroslav Rudnytskyi
 * @version 10.02.2016
 */
public class SwebleASTNode implements ASTNode {
    private final WtNode node;
    private final ASTNodeID id;
    private final ASTNode parent;
    private List<ASTNode> children = new ArrayList<>();

    public SwebleASTNode(WtNode content, ASTNode parent) {
        // parent check is unnecessary - recursive initializer would not compile
        id = new ASTNodeID();
        this.node = Objects.requireNonNull(content, "Null WtNode!");
        this.parent = parent;
    }

    @Override
    public ASTNodeID getUID() {
        return id;
    }

    @Override
    public ASTNode getParent() {
        return parent;
    }

    @Override
    public void addChild(ASTNode child) {
        if (this.equals(child)) {
            throw new IllegalArgumentException("Can not be child to yourself!");
        }
        Objects.requireNonNull(child, "Child node null!");
        children.add(child);
    }

    /**
     * {@inheritDoc}
     * Note, that if current node isn't root, empty Markup is returned
     */
    @Override
    public MarkupText getMarkupText() {
        // TODO: bug in Sweble, write workaround
        String str = "";
        try {
            WtPrettyPrinter.print(new StringWriter(), node);
        } catch (Exception e) {
            // ignore
        }
        return new WikiMarkup(str);
    }

    @Override
    public ASTNodeType getType() {
        return new SwebleASTNodeType(this);
    }

    protected WtNode getNode() {
        return node;
    }

    @Override
    public boolean equals(Object object) {
        if (object == this) {
            return true;
        }
        if (object instanceof SwebleASTNode) {
            SwebleASTNode thatObject = (SwebleASTNode) object;
            return id.equals(thatObject.id);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return id.hashCode();
    }

    @Override
    public String toString() {
        String nodeName = node.getNodeName();
        if (node.size() == 0) {
            // unescape string, because Sweble parser escapes to \\u...
            nodeName = StringEscapeUtils.unescapeJava(node.toString());
        }
        return nodeName;
    }

    @Override
    public Iterator<ASTNode> iterator() {
        return children.iterator();
    }
}