This repository was archived by the owner on Nov 17, 2024. It is now read-only.
forked from tabulapdf/tabula-java
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathTextStripper.java
More file actions
175 lines (148 loc) · 6.01 KB
/
TextStripper.java
File metadata and controls
175 lines (148 loc) · 6.01 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
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;
}
}