org.eclipse.xtext.formatting2.debug.TextRegionListToString.java Source code

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Here is the source code for org.eclipse.xtext.formatting2.debug.TextRegionListToString.java

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/*******************************************************************************
 * Copyright (c) 2014 itemis AG (http://www.itemis.eu) and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *******************************************************************************/
package org.eclipse.xtext.formatting2.debug;

import java.util.List;

import org.eclipse.xtext.util.ITextRegion;

import com.google.common.base.Joiner;
import com.google.common.base.Strings;
import com.google.common.collect.Lists;

/**
 * @author Moritz Eysholdt - Initial contribution and API
 */
public class TextRegionListToString {

    protected static class Item {
        private boolean indented;
        private ITextRegion region;
        private String text;

        public Item(ITextRegion region, String text, boolean indented) {
            super();
            this.region = region;
            this.text = text;
            this.indented = indented;
        }
    }

    private List<Item> items = Lists.newArrayList();

    public void add(ITextRegion region, String text) {
        add(region, text, true);
    }

    protected void add(ITextRegion region, String text, boolean indented) {
        items.add(new Item(region, text, indented));
    }

    public void add(String text) {
        add(null, text, true);
    }

    public void add(String text, boolean indented) {
        add(null, text, indented);
    }

    @Override
    public String toString() {
        int offsetDigits = 0;
        int lengthDigits = 0;
        for (Item item : items) {
            if (item.region != null) {
                int lengthD = String.valueOf(item.region.getLength()).length();
                if (lengthDigits < lengthD)
                    lengthDigits = lengthD;
                int lengthO = String.valueOf(item.region.getOffset()).length();
                if (offsetDigits < lengthO)
                    offsetDigits = lengthO;
            }
        }
        List<String> result = Lists.newArrayListWithExpectedSize(items.size());
        String prefix = Strings.repeat(" ", offsetDigits + lengthDigits + 2);
        for (Item item : items) {
            String[] lines = item.text.split("\n");
            if (item.region != null) {
                String offset = Strings.padStart(String.valueOf(item.region.getOffset()), offsetDigits, ' ');
                String length = Strings.padStart(String.valueOf(item.region.getLength()), lengthDigits, ' ');
                if (lines.length == 1) {
                    result.add(offset + " " + length + " " + lines[0]);
                } else {
                    String offsetSpace = Strings.repeat(" ", offsetDigits);
                    String lengthSpace = Strings.repeat(" ", lengthDigits);
                    for (int i = 0; i < lines.length; i++) {
                        String first = i == 0 ? offset : offsetSpace;
                        String second = i == lines.length - 1 ? length : lengthSpace;
                        result.add(first + " " + second + " " + lines[i]);
                    }
                }
            } else if (item.indented) {
                for (int i = 0; i < lines.length; i++)
                    result.add(prefix + lines[i]);
            } else {
                for (int i = 0; i < lines.length; i++)
                    result.add(lines[i]);
            }
        }
        return Joiner.on("\n").join(result);
    }
}