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TextStripper.java
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175 lines (148 loc) · 6.01 KB
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package technology.tabula;
import org.apache.fontbox.util.BoundingBox;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDFontDescriptor;
import org.apache.pdfbox.pdmodel.font.PDType3Font;
import org.apache.pdfbox.text.PDFTextStripper;
import org.apache.pdfbox.text.TextPosition;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class TextStripper extends PDFTextStripper {
private static final String NBSP = "\u00A0";
private static final float AVG_HEIGHT_MULT_THRESHOLD = 6.0f;
private static final float MAX_BLANK_FONT_SIZE = 40.0f;
private static final float MIN_BLANK_FONT_SIZE = 2.0f;
private final PDDocument document;
private final ArrayList<TextElement> textElements;
private final RectangleSpatialIndex<TextElement> spatialIndex;
private float minCharWidth = Float.MAX_VALUE;
private float minCharHeight = Float.MAX_VALUE;
private float totalHeight = 0.0f;
private int countHeight = 0;
public TextStripper(PDDocument document, int pageNumber) throws IOException {
super();
this.document = document;
this.setStartPage(pageNumber);
this.setEndPage(pageNumber);
this.textElements = new ArrayList<>();
this.spatialIndex = new RectangleSpatialIndex<>();
}
public void process() throws IOException {
this.getText(this.document);
}
@Override
protected void writeString(String string, List<TextPosition> textPositions) throws IOException
{
for (TextPosition textPosition: textPositions)
{
if (textPosition == null) {
continue;
}
String c = textPosition.getUnicode();
// if c not printable, return
if (!isPrintable(c)) {
continue;
}
Float h = textPosition.getHeightDir();
if (c.equals(NBSP)) { // replace non-breaking space for space
c = " ";
}
float wos = textPosition.getWidthOfSpace();
TextElement te = new TextElement(Utils.round(textPosition.getYDirAdj() - h, 2),
Utils.round(textPosition.getXDirAdj(), 2), Utils.round(textPosition.getWidthDirAdj(), 2),
Utils.round(textPosition.getHeightDir(), 2), textPosition.getFont(), textPosition.getFontSizeInPt(), c,
// workaround a possible bug in PDFBox:
// https://issues.apache.org/jira/browse/PDFBOX-1755
wos, textPosition.getDir());
this.minCharWidth = (float) Math.min(this.minCharWidth, te.getWidth());
this.minCharHeight = (float) Math.min(this.minCharHeight, te.getHeight());
countHeight++;
totalHeight += te.getHeight();
float avgHeight = totalHeight / countHeight;
//We have an issue where tall blank cells throw off the row height calculation
//Introspect a blank cell a bit here to see if it should be thrown away
if ((te.getText() == null || te.getText().trim().equals(""))) {
//if the cell height is more than AVG_HEIGHT_MULT_THRESHOLDxaverage, throw it away
if (avgHeight > 0
&& te.getHeight() >= (avgHeight * AVG_HEIGHT_MULT_THRESHOLD)) {
continue;
}
//if the font size is outside of reasonable ranges, throw it away
if (textPosition.getFontSizeInPt() > MAX_BLANK_FONT_SIZE || textPosition.getFontSizeInPt() < MIN_BLANK_FONT_SIZE) {
continue;
}
}
this.spatialIndex.add(te);
this.textElements.add(te);
}
}
@Override
protected float computeFontHeight(PDFont font) throws IOException
{
BoundingBox bbox = font.getBoundingBox();
if (bbox.getLowerLeftY() < Short.MIN_VALUE)
{
// PDFBOX-2158 and PDFBOX-3130
// files by Salmat eSolutions / ClibPDF Library
bbox.setLowerLeftY(- (bbox.getLowerLeftY() + 65536));
}
// 1/2 the bbox is used as the height todo: why?
float glyphHeight = bbox.getHeight() / 2;
// sometimes the bbox has very high values, but CapHeight is OK
PDFontDescriptor fontDescriptor = font.getFontDescriptor();
if (fontDescriptor != null)
{
float capHeight = fontDescriptor.getCapHeight();
if (Float.compare(capHeight, 0) != 0 &&
(capHeight < glyphHeight || Float.compare(glyphHeight, 0) == 0))
{
glyphHeight = capHeight;
}
// PDFBOX-3464, PDFBOX-448:
// sometimes even CapHeight has very high value, but Ascent and Descent are ok
float ascent = fontDescriptor.getAscent();
float descent = fontDescriptor.getDescent();
if (ascent > 0 && descent < 0 &&
((ascent - descent) / 2 < glyphHeight || Float.compare(glyphHeight, 0) == 0))
{
glyphHeight = (ascent - descent) / 2;
}
}
// transformPoint from glyph space -> text space
float height;
if (font instanceof PDType3Font)
{
height = font.getFontMatrix().transformPoint(0, glyphHeight).y;
}
else
{
height = glyphHeight / 1000;
}
return height;
}
private boolean isPrintable(String s) {
Character c;
Character.UnicodeBlock block;
boolean printable = false;
for (int i = 0; i < s.length(); i++) {
c = s.charAt(i);
block = Character.UnicodeBlock.of(c);
printable |= !Character.isISOControl(c) && block != null && block != Character.UnicodeBlock.SPECIALS;
}
return printable;
}
public List<TextElement> getTextElements() {
return this.textElements;
}
public RectangleSpatialIndex<TextElement> getSpatialIndex() {
return spatialIndex;
}
public float getMinCharWidth() {
return minCharWidth;
}
public float getMinCharHeight() {
return minCharHeight;
}
}