de.intarsys.pdf.content.text.CSTextExtractor Maven / Gradle / Ivy

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This is a fork of http://sourceforge.net/projects/jpodlib/ as development seems to be frozen. We're providing some bug fixes along with deployments to maven.

There is a newer version: 2.0

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/*
 * intarsys consulting gmbh
 * all rights reserved
 *
 */
package de.intarsys.pdf.content.text;

import de.intarsys.pdf.content.ICSInterpreter;
import de.intarsys.pdf.cos.COSName;
import de.intarsys.pdf.font.PDFont;
import de.intarsys.pdf.font.PDGlyphs;

import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;

/**
 * A still very simple text extraction utility for PDF documents.
 */
public class CSTextExtractor extends CSCharacterParser {

    private StringBuilder content;

    private double maxDX = 5;

    private double maxDY = 5;

    private void append(char c) {
        if (c > 0) {
            content.append(c);
        } else {
            content.append(' ');
        }
    }

    private void append(char[] chars) {
        content.append(chars);
    }

    private void append(String s) {
        content.append(s);
    }

    public String getContent() {
        return content.toString();
    }

    @Override
    protected void onCharacterFound(PDGlyphs glyphs, Rectangle2D rect) {
        char[] chars = glyphs.getChars();
        if (chars == null) {
            chars = new char[]{' '};
        }

        double dX = lastStopX - lastStartX;
        double dY = lastStopY - lastStartY;
        if (Math.abs(dX) < maxDX) {
            if (Math.abs(dY) > maxDY && content.length() > 0) {
                append(System.getProperty("line.separator"));
            }
        } else {
            if (content.length() > 0) {
                if (Math.abs(dY) < maxDY) {
                    append(" ");
                } else {
                    append(System.getProperty("line.separator"));
                }
            }
        }
        append(chars);
    }

    @Override
    public void open(ICSInterpreter pInterpreter) {
        super.open(pInterpreter);
        content = new StringBuilder();
    }

    @Override
    public void textSetFont(COSName name, PDFont font, float size) {
        super.textSetFont(name, font, size);
        AffineTransform tx;
        tx = (AffineTransform) getDeviceTransform().clone();
        tx.concatenate(textState.globalTransform);
        maxDX = textState.fontSize * 0.2 * tx.getScaleX();
        maxDY = textState.fontSize * 0.6 * tx.getScaleY();
    }

    @Override
    public void textSetTransform(float a, float b, float c, float d, float e, float f) {
        super.textSetTransform(a, b, c, d, e, f);
        AffineTransform tx;
        tx = (AffineTransform) getDeviceTransform().clone();
        tx.concatenate(textState.globalTransform);
        maxDX = textState.fontSize * 0.2 * tx.getScaleX();
        maxDY = textState.fontSize * 0.6 * tx.getScaleY();
    }
}