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/*
* This file is part of the pdftk port to java
*
* Copyright (c) Marc Vinyals 2017-2018
*
* The program is a java port of PDFtk, the PDF Toolkit
* Copyright (c) 2003-2013 Steward and Lee, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* The program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.gitlab.pdftk_java;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
class PageRange {
int beg, end;
final int m_num_pages;
final String m_argv;
PageRange(int num_pages, String argv) {
m_num_pages = num_pages;
m_argv = argv;
}
int parse_bound(String bound) {
if (bound.equals("end")) return m_num_pages;
return Integer.parseInt(bound);
}
void out_of_range_error(String where) {
System.err.println("Error: Range " + where + " page number exceeds size of PDF");
System.err.println(" here: " + m_argv);
System.err.println(" input PDF has: " + m_num_pages + " pages.");
System.err.println(" Exiting.");
}
boolean parse(StringBuilder unparsed) {
String page_regex = "(r?)(end|[0-9]*)";
Pattern range_regex = Pattern.compile(page_regex + "(-" + page_regex + ")?");
Matcher m = range_regex.matcher(unparsed.toString());
m.lookingAt();
unparsed.delete(m.start(), m.end());
String pre_reverse = m.group(1);
String pre_range = m.group(2);
String hyphen = m.group(3);
String post_reverse = m.group(4);
String post_range = m.group(5);
return parse(pre_reverse, pre_range, post_reverse, post_range);
}
boolean parse(String pre_reverse, String pre_range, String post_reverse, String post_range) {
beg = 0; // default value
if (!pre_range.isEmpty()) {
beg = parse_bound(pre_range);
if (m_num_pages < beg) {
// error: page number out of range
out_of_range_error("start");
return false;
}
boolean pre_reverse_b = (!pre_reverse.isEmpty()); // single lc 'r' before page range
if (pre_reverse_b) // above test ensures good value here
beg = m_num_pages - beg + 1;
}
end = beg; // default value
if (post_range != null && !post_range.isEmpty()) {
end = parse_bound(post_range);
if (m_num_pages < end) {
// error: page number out of range
out_of_range_error("end");
return false;
}
boolean post_reverse_b = (!post_reverse.isEmpty()); // single lc 'r' before page range
if (post_reverse_b) // above test ensures good value here
end = m_num_pages - end + 1;
}
return true;
}
}
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