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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/PageRanges.cpp
Initial commit
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diff --git a/dviware/dvisvgm/src/PageRanges.cpp b/dviware/dvisvgm/src/PageRanges.cpp
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+/*************************************************************************
+** PageRanges.cpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2019 Martin Gieseking <martin.gieseking@uos.de> **
+** **
+** 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 3 of **
+** the License, or (at your option) any later version. **
+** **
+** This 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/>. **
+*************************************************************************/
+
+#include <sstream>
+#include "InputBuffer.hpp"
+#include "InputReader.hpp"
+#include "PageRanges.hpp"
+
+using namespace std;
+
+
+/** Analyzes a string describing a range sequence.
+ * Syntax: ([0-9]+(-[0-9]*)?)|(-[0-9]+)(,([0-9]+(-[0-9]*)?)|(-[0-9]+))*
+ * @param[in] str string to parse
+ * @param[in] max_page greatest allowed value
+ * @return true on success; false denotes a syntax error */
+bool PageRanges::parse (const string &str, int max_page) {
+ StringInputBuffer ib(str);
+ BufferInputReader ir(ib);
+ while (ir) {
+ int first=1;
+ int last=max_page;
+ ir.skipSpace();
+ if (!isdigit(ir.peek()) && ir.peek() != '-')
+ return false;
+
+ if (isdigit(ir.peek()))
+ first = ir.getInt();
+ ir.skipSpace();
+ if (ir.peek() == '-') {
+ while (ir.peek() == '-')
+ ir.get();
+ ir.skipSpace();
+ if (isdigit(ir.peek()))
+ last = ir.getInt();
+ }
+ else
+ last = first;
+ ir.skipSpace();
+ if (ir.peek() == ',') {
+ ir.get();
+ if (ir.eof())
+ return false;
+ }
+ else if (!ir.eof())
+ return false;
+ if (first > last)
+ swap(first, last);
+ first = max(1, first);
+ last = max(first, last);
+ if (max_page > 0) {
+ first = min(first, max_page);
+ last = min(last, max_page);
+ }
+ addRange(first, last);
+ }
+ return true;
+}
+
+
+/** Returns the number of pages. */
+size_t PageRanges::numberOfPages () const {
+ size_t sum=0;
+ for (const auto &entry : *this)
+ sum += entry.second - entry.first + 1;
+ return sum;
+}