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
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.pdf;
import java.util.regex.Pattern;
/**
* Class representing a PDF /PageLabels dictionary.
*/
public class PDFPageLabels extends PDFNumberTreeNode {
private static final int DECIMAL = 1; // '0*1'
private static final int LOWER_ALPHA = 2; // 'a'
private static final int UPPER_ALPHA = 3; // 'A'
private static final int LOWER_ROMAN = 4; // 'i'
private static final int UPPER_ROMAN = 5; // 'I'
private static final int PREFIX = 6;
private static final PDFName S_DECIMAL = new PDFName("D");
private static final PDFName S_UPPER_ROMAN = new PDFName("R");
private static final PDFName S_LOWER_ROMAN = new PDFName("r");
private static final PDFName S_UPPER_ALPHA = new PDFName("A");
private static final PDFName S_LOWER_ALPHA = new PDFName("a");
private static final Pattern MATCH_DECIMAL = Pattern.compile("\\d+");
private static final Pattern MATCH_ROMAN = Pattern.compile(
"^M{0,3}(CM|CD|D?C{0,3})(XC|XL|L?X{0,3})(IX|IV|V?I{0,3})$", Pattern.CASE_INSENSITIVE);
private static final Pattern MATCH_LETTER = Pattern.compile("^[a-zA-Z]$");
private int lastPageLabelType;
private int lastPageNumber;
private String lastZeroPaddingPrefix = "";
/**
* Create the /PageLabels dictionary
*/
public PDFPageLabels() {
super();
}
/**
* Adds a new entry, if necessary, to the /PageLabels dictionary.
* @param index the page index (0 for page 1)
* @param pageLabel the page number as a string
*/
public void addPageLabel(int index, String pageLabel) {
boolean addNewPageLabel = false;
String padding = "00000000";
int currentPageNumber = 0;
int currentPageLabelType = 0;
String currentZeroPaddingPrefix = "";
if (MATCH_DECIMAL.matcher(pageLabel).matches()) {
// since an integer is the most common case we start with that
currentPageLabelType = DECIMAL;
currentPageNumber = Integer.parseInt(pageLabel);
int zeroPadding = 0;
if (pageLabel.charAt(zeroPadding) == '0') {
do {
zeroPadding++;
} while (pageLabel.charAt(zeroPadding) == '0');
currentZeroPaddingPrefix = padding.substring(0, zeroPadding);
if (currentZeroPaddingPrefix.length() != lastZeroPaddingPrefix.length()) {
addNewPageLabel = true;
}
} else {
if (lastZeroPaddingPrefix.length() != 0) {
addNewPageLabel = true;
}
}
} else if (MATCH_ROMAN.matcher(pageLabel).matches()) {
if (pageLabel.toLowerCase().equals(pageLabel)) {
currentPageLabelType = LOWER_ROMAN;
} else {
currentPageLabelType = UPPER_ROMAN;
}
currentPageNumber = romanToArabic(pageLabel);
} else if (MATCH_LETTER.matcher(pageLabel).matches()) {
char c = pageLabel.charAt(0);
if (c > 'Z') {
currentPageLabelType = LOWER_ALPHA;
} else {
currentPageLabelType = UPPER_ALPHA;
}
currentPageNumber = alphabeticToArabic(c);
} else {
// alphabetic numbering in XSL_FO and labelling in PDF are different after AA (AB versus BB)
// we will use the /P (prefix) label in that case
currentPageLabelType = PREFIX;
addNewPageLabel = true;
}
if (lastPageLabelType != currentPageLabelType) {
addNewPageLabel = true;
}
if (lastPageNumber != currentPageNumber - 1) {
addNewPageLabel = true;
}
if (addNewPageLabel) {
PDFNumsArray nums = getNums();
PDFDictionary dict = new PDFDictionary(nums);
PDFName pdfName = null;
switch (currentPageLabelType) {
case PREFIX:
dict.put("P", pageLabel);
break;
default:
switch (currentPageLabelType) {
case DECIMAL:
pdfName = S_DECIMAL;
if (currentZeroPaddingPrefix.length() != 0) {
dict.put("P", currentZeroPaddingPrefix);
}
break;
case LOWER_ROMAN:
pdfName = S_LOWER_ROMAN;
break;
case UPPER_ROMAN:
pdfName = S_UPPER_ROMAN;
break;
case LOWER_ALPHA:
pdfName = S_LOWER_ALPHA;
break;
case UPPER_ALPHA:
pdfName = S_UPPER_ALPHA;
break;
default:
}
dict.put("S", pdfName);
if (currentPageNumber != 1) {
dict.put("St", currentPageNumber);
}
}
nums.put(index, dict);
}
lastPageLabelType = currentPageLabelType;
lastPageNumber = currentPageNumber;
lastZeroPaddingPrefix = currentZeroPaddingPrefix;
}
private int romanToArabic(String roman) {
int arabic = 0;
int previousValue = 0;
int newValue = 0;
String upperRoman = roman.toUpperCase();
for (int i = 0; i < upperRoman.length(); i++) {
char romanDigit = upperRoman.charAt(i);
switch (romanDigit) {
case 'I':
newValue = 1;
break;
case 'V':
newValue = 5;
break;
case 'X':
newValue = 10;
break;
case 'L':
newValue = 50;
break;
case 'C':
newValue = 100;
break;
case 'D':
newValue = 500;
break;
case 'M':
newValue = 1000;
break;
default:
}
if (previousValue < newValue) {
arabic -= previousValue;
} else {
arabic += previousValue;
}
previousValue = newValue;
}
arabic += previousValue;
return arabic;
}
private int alphabeticToArabic(char c) {
int arabic = Character.toLowerCase(c) - 'a' + 1;
return arabic;
}
}
|
