diff options
author | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
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committer | Norbert Preining <norbert@preining.info> | 2019-09-02 13:46:59 +0900 |
commit | e0c6872cf40896c7be36b11dcc744620f10adf1d (patch) | |
tree | 60335e10d2f4354b0674ec22d7b53f0f8abee672 /dviware/dvisvgm/src/PageRanges.cpp |
Initial commit
Diffstat (limited to 'dviware/dvisvgm/src/PageRanges.cpp')
-rw-r--r-- | dviware/dvisvgm/src/PageRanges.cpp | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/PageRanges.cpp b/dviware/dvisvgm/src/PageRanges.cpp new file mode 100644 index 0000000000..e6c1a8287b --- /dev/null +++ b/dviware/dvisvgm/src/PageRanges.cpp @@ -0,0 +1,84 @@ +/************************************************************************* +** 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; +} |