org.eclipse.mylyn.internal.wikitext.commonmark.TextSegment.java Source code

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Here is the source code for org.eclipse.mylyn.internal.wikitext.commonmark.TextSegment.java

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/*******************************************************************************
 * Copyright (c) 2015 David Green.
 * 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
 *
 * Contributors:
 *     David Green - initial API and implementation
 *******************************************************************************/

package org.eclipse.mylyn.internal.wikitext.commonmark;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

import java.util.List;

import com.google.common.base.Objects;
import com.google.common.collect.ImmutableList;

public class TextSegment {

    private final List<Line> lines;

    private final String text;

    public TextSegment(Iterable<Line> lines) {
        this.lines = ImmutableList.copyOf(lines);
        text = computeText(this.lines);
    }

    private static String computeText(List<Line> lines) {
        String text = "";
        for (Line line : lines) {
            if (text.length() > 0) {
                text += "\n";
            }
            text += line.getText();
        }
        return text;
    }

    public String getText() {
        return text;
    }

    public List<Line> getLines() {
        return lines;
    }

    public int offsetOf(int textOffset) {
        checkArgument(textOffset >= 0);
        int textOffsetOfLine = 0;
        int remainder = textOffset;
        for (Line line : lines) {
            textOffsetOfLine = line.getOffset();
            int linePlusSeparatorLength = line.getText().length() + 1;
            if (linePlusSeparatorLength > remainder) {
                break;
            }
            remainder -= linePlusSeparatorLength;
        }
        return textOffsetOfLine + remainder;
    }

    public int toTextOffset(int documentOffset) {
        int textOffset = 0;
        for (Line line : lines) {
            int lineRelativeOffset = documentOffset - line.getOffset();
            int linePlusSeparatorLength = line.getText().length() + 1;
            if (lineRelativeOffset >= 0 && lineRelativeOffset < linePlusSeparatorLength) {
                return textOffset + lineRelativeOffset;
            }
            textOffset += linePlusSeparatorLength;
        }
        throw new IllegalArgumentException();
    }

    @Override
    public String toString() {
        return Objects.toStringHelper(TextSegment.class).add("text", ToStringHelper.toStringValue(text)).toString();
    }

    public Line getLineAtOffset(int textOffset) {
        int documentOffset = offsetOf(textOffset);
        Line previous = null;
        for (Line line : lines) {
            if (line.getOffset() > documentOffset) {
                break;
            }
            previous = line;
        }
        return checkNotNull(previous);
    }

}