com.bacoder.parser.core.DumpVisitor.java Source code

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Here is the source code for com.bacoder.parser.core.DumpVisitor.java

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/**
 * Copyright 2013 Huining (Thomas) Feng (tfeng@berkeley.edu)
 *
 * 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 com.bacoder.parser.core;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;

import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.lang.StringEscapeUtils;

import com.google.common.base.Strings;

public class DumpVisitor implements Visitor<Node> {

    private String indent = "  ";

    private int level;

    private OutputStream outputStream;

    public DumpVisitor(OutputStream outputStream) {
        this.outputStream = outputStream;
    }

    public DumpVisitor(OutputStream outputStream, String indent) {
        this.outputStream = outputStream;
        this.indent = indent;
    }

    @Override
    public void visitAfter(Node node) {
        level--;
        String s = String.format("%s</%s>\n", Strings.repeat(indent, level), node.getClass().getSimpleName());
        try {
            outputStream.write(s.getBytes());
        } catch (IOException e) {
            throw new RuntimeException("Unable to write \"" + s + "\"", e);
        }
    }

    @Override
    public void visitBefore(Node node) {
        String tag = String.format("%s<%s sl=\"%d\" sc=\"%d\" el=\"%d\" ec=\"%d\">\n",
                Strings.repeat(indent, level), node.getClass().getSimpleName(), node.getStartLine(),
                node.getStartColumn(), node.getEndLine(), node.getEndColumn());
        try {
            outputStream.write(tag.getBytes());

            Class<? extends Node> clazz = node.getClass();
            if (clazz.getAnnotation(DumpTextWithToString.class) != null) {
                String property = String.format("%s<text>%s</text>\n", Strings.repeat(indent, level + 1),
                        node.toString());
                try {
                    outputStream.write(property.getBytes());
                } catch (IOException e) {
                    throw new RuntimeException("Unable to write \'" + property + "\'", e);
                }
            } else {
                Field[] fields = node.getClass().getDeclaredFields();
                for (Field field : fields) {
                    Class<?> type = field.getType();
                    if (type.isPrimitive() || type.isEnum() || String.class.isAssignableFrom(type)) {
                        String propertyName = field.getName();
                        Object value;
                        try {
                            value = PropertyUtils.getSimpleProperty(node, propertyName);
                            String property = String.format("%s<%s>%s</%s>\n", Strings.repeat(indent, level + 1),
                                    propertyName,
                                    value == null ? "" : StringEscapeUtils.escapeXml(value.toString()),
                                    propertyName);
                            try {
                                outputStream.write(property.getBytes());
                            } catch (IOException e) {
                                throw new RuntimeException("Unable to write \'" + property + "\'", e);
                            }
                        } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
                            // Ignore the field.
                        }
                    }
                }
            }
        } catch (IOException e) {
            throw new RuntimeException("Unable to write \'" + tag + "\'", e);
        }
        level++;
    }

    protected String getIndent() {
        return indent;
    }

    protected int getLevel() {
        return level;
    }

    protected OutputStream getOutputStream() {
        return outputStream;
    }
}