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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.3/src/PageRanges.cpp')
| -rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.0.3/src/PageRanges.cpp | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.3/src/PageRanges.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.3/src/PageRanges.cpp new file mode 100644 index 00000000000..85a124683c7 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.3/src/PageRanges.cpp @@ -0,0 +1,135 @@ +/************************************************************************* +** PageRanges.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2010 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.h" +#include "InputReader.h" +#include "PageRanges.h" + +#include "macros.h" + +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 + * @param[out] ranges the extracted range sequence + * @return true on success; false denotes a syntax error */ +bool PageRanges::parse (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); + } + insert(first, last); + } + return true; +} + + +/** Adds a page range to the range collection. + * @param[in] first first page of new range + * @param[in] last last page of new range */ +void PageRanges::insert (int first, int last) { + if (first > last) + swap(first, last); + Container::iterator it = _ranges.begin(); + while (it != _ranges.end() && first > it->first+1 && first > it->second+1) + ++it; + if (it == _ranges.end() || last < it->first-1 || first > it->second+1) + it = _ranges.insert(it, Range(first, last)); + else if ((first < it->first && last >= it->first-1) || (first <= it->second+1 && last > it->second)) { + it->first = min(it->first, first); + it->second = max(it->second, last); + } + // merge adjacent ranges + if (it != _ranges.end()) { + Container::iterator l = it; + Container::iterator r = it; + if (l == _ranges.begin()) + l = _ranges.end(); + else + --l; + ++r; + bool l_modified = false; + bool r_modified = false; + if (l != _ranges.end() && l->second >= it->first-1) { + l->first = min(l->first, it->first); + l->second = max(l->second, it->second); + l_modified = true; + } + if (r != _ranges.end() && r->first <= it->second+1) { + r->first = min(r->first, it->first); + r->second = max(r->second, it->second); + r_modified = true; + } + if (l_modified || r_modified) { + _ranges.erase(it); + if (l_modified && r_modified && l->second >= r->first-1) { + l->first = min(l->first, r->first); + l->second = max(l->second, r->second); + _ranges.erase(r); + } + } + } +} + + +/** Returns the number of pages. */ +size_t PageRanges::pages () const { + size_t sum=0; + for (ConstIterator it=_ranges.begin(); it != _ranges.end(); ++it) + sum += it->second - it->first + 1; + return sum; +} |